diff --git a/.github/issue_template.md b/.github/issue_template.md
index 5e9d83d..7c31353 100644
--- a/.github/issue_template.md
+++ b/.github/issue_template.md
@@ -38,4 +38,4 @@
 
 ## Question
 
-**Please first check for answers in the [Mbed TLS knowledge Base](https://tls.mbed.org/kb), and preferably file an issue in the [Mbed TLS support forum](https://tls.mbed.org/discussions)**  
+**Please first check for answers in the [Mbed TLS knowledge Base](https://tls.mbed.org/kb), and preferably file an issue in the [Mbed TLS support forum](https://forums.mbed.com/c/mbed-tls)**  
diff --git a/ChangeLog b/ChangeLog
index 609fa79..a7e6288 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -4,8 +4,36 @@
 
 Features
    * Add new crypto primitives from RFC 7539: stream cipher Chacha20, one-time
-   authenticator Poly1305 and AEAD construct Chacha20-Poly1305. Contributed by
-   Daniel King (#485).
+     authenticator Poly1305 and AEAD construct Chacha20-Poly1305. Contributed
+     by Daniel King (#485).
+   * Add support for CHACHA20-POLY1305 ciphersuites from RFC 7905.
+   * Add platform support for the Haiku OS. (https://www.haiku-os.org).
+     Contributed by Augustin Cavalier.
+   * Make the receive and transmit buffers independent sizes, for situations
+     where the outgoing buffer can be fixed at a smaller size than the incoming
+     buffer, which can save some RAM. If buffer lengths are kept equal, there
+     is no functional difference. Contributed by Angus Gratton, and also
+     independently contributed again by Paul Sokolovsky.
+
+Bugfix
+   * Fix the key_app_writer example which was writing a leading zero byte which
+     was creating an invalid ASN.1 tag. Found by Aryeh R. Fixes #1257.
+   * Fix compilation error on C++, because of a variable named new.
+     Found and fixed by Hirotaka Niisato in #1783.
+   * Fix "no symbols" warning issued by ranlib when building on Mac OS X. Fix
+     contributed by tabascoeye in pull request #1600.
+   * Clarify documentation for mbedtls_ssl_write() to include 0 as a valid
+     return value. Found by @davidwu2000. #839
+   * Fix a memory leak in mbedtls_x509_csr_parse(), found by catenacyber,
+     Philippe Antoine. Fixes #1623.
+   * Remove unused headers included in x509.c. Found by Chris Hanson and fixed
+     by Brendan Shanks. Part of a fix for #992.
+   * Fix compilation error when MBEDTLS_ARC4_C is disabled and
+     MBEDTLS_CIPHER_NULL_CIPHER is enabled. Found by TrinityTonic in #1719.
+   * Fix the inline assembly for the MPI multiply helper function for i386 and
+     i386 with SSE2. Found by László Langó. Fixes #1550
+   * Fix namespacing in header files. Remove the `mbedtls` namespacing in
+     the `#include` in the header files. Resolves #857
 
 Changes
    * Change the shebang line in Perl scripts to look up perl in the PATH.
@@ -33,6 +61,8 @@
    * Fix compilation warnings with IAR toolchain, on 32 bit platform.
      Reported by rahmanih in #683
    * Fix braces in mbedtls_memory_buffer_alloc_status(). Found by sbranden, #552.
+   * Added length checks to some TLS parsing functions. Found and fixed by
+     Philippe Antoine from Catena cyber. #1663.
 
 Changes
    * Changed CMake defaults for IAR to treat all compiler warnings as errors.
diff --git a/README.md b/README.md
index a2c3c6f..ced36e1 100644
--- a/README.md
+++ b/README.md
@@ -211,7 +211,7 @@
 
 ### Making a Contribution
 
-1.  [Check for open issues](https://github.com/ARMmbed/mbedtls/issues) or [start a discussion](https://tls.mbed.org/discussions) around a feature idea or a bug.
+1.  [Check for open issues](https://github.com/ARMmbed/mbedtls/issues) or [start a discussion](https://forums.mbed.com/c/mbed-tls) around a feature idea or a bug.
 2.  Fork the [Mbed TLS repository on GitHub](https://github.com/ARMmbed/mbedtls) to start making your changes. As a general rule, you should use the "development" branch as a basis.
 3.  Write a test which shows that the bug was fixed or that the feature works as expected.
 4.  Send a pull request and bug us until it gets merged and published. Contributions may need some modifications, so work with us to get your change accepted. We will include your name in the ChangeLog :)
diff --git a/configs/config-ccm-psk-tls1_2.h b/configs/config-ccm-psk-tls1_2.h
index a783e6b..c9b58dd 100644
--- a/configs/config-ccm-psk-tls1_2.h
+++ b/configs/config-ccm-psk-tls1_2.h
@@ -81,7 +81,7 @@
  * both ends of the connection!  (See comments in "mbedtls/ssl.h".)
  * The optimal size here depends on the typical size of records.
  */
-#define MBEDTLS_SSL_MAX_CONTENT_LEN             512
+#define MBEDTLS_SSL_MAX_CONTENT_LEN             1024
 
 #include "mbedtls/check_config.h"
 
diff --git a/include/mbedtls/bn_mul.h b/include/mbedtls/bn_mul.h
index f4b2b56..438aa8c 100644
--- a/include/mbedtls/bn_mul.h
+++ b/include/mbedtls/bn_mul.h
@@ -49,7 +49,14 @@
 /* armcc5 --gnu defines __GNUC__ but doesn't support GNU's extended asm */
 #if defined(__GNUC__) && \
     ( !defined(__ARMCC_VERSION) || __ARMCC_VERSION >= 6000000 )
-#if defined(__i386__)
+
+/*
+ * Disable use of the i386 assembly code below if option -O0, to disable all
+ * compiler optimisations, is passed, detected with __OPTIMIZE__
+ * This is done as the number of registers used in the assembly code doesn't
+ * work with the -O0 option.
+ */
+#if defined(__i386__) && !defined(__OPTIMIZE__)
 
 #define MULADDC_INIT                        \
     asm(                                    \
@@ -142,7 +149,7 @@
         "movl   %%esi, %3       \n\t"   \
         : "=m" (t), "=m" (c), "=m" (d), "=m" (s)        \
         : "m" (t), "m" (s), "m" (d), "m" (c), "m" (b)   \
-        : "eax", "ecx", "edx", "esi", "edi"             \
+        : "eax", "ebx", "ecx", "edx", "esi", "edi"      \
     );
 
 #else
@@ -154,7 +161,7 @@
         "movl   %%esi, %3       \n\t"   \
         : "=m" (t), "=m" (c), "=m" (d), "=m" (s)        \
         : "m" (t), "m" (s), "m" (d), "m" (c), "m" (b)   \
-        : "eax", "ecx", "edx", "esi", "edi"             \
+        : "eax", "ebx", "ecx", "edx", "esi", "edi"      \
     );
 #endif /* SSE2 */
 #endif /* i386 */
diff --git a/include/mbedtls/cipher.h b/include/mbedtls/cipher.h
index a1f4738..ea0ce98 100644
--- a/include/mbedtls/cipher.h
+++ b/include/mbedtls/cipher.h
@@ -45,7 +45,7 @@
 #define MBEDTLS_CIPHER_MODE_WITH_PADDING
 #endif
 
-#if defined(MBEDTLS_ARC4_C)
+#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER)
 #define MBEDTLS_CIPHER_MODE_STREAM
 #endif
 
diff --git a/include/mbedtls/cmac.h b/include/mbedtls/cmac.h
index 913c05f..a4fd552 100644
--- a/include/mbedtls/cmac.h
+++ b/include/mbedtls/cmac.h
@@ -28,7 +28,7 @@
 #ifndef MBEDTLS_CMAC_H
 #define MBEDTLS_CMAC_H
 
-#include "mbedtls/cipher.h"
+#include "cipher.h"
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/include/mbedtls/compat-1.3.h b/include/mbedtls/compat-1.3.h
index 600a0f1..213b691 100644
--- a/include/mbedtls/compat-1.3.h
+++ b/include/mbedtls/compat-1.3.h
@@ -1378,7 +1378,8 @@
 #define SSL_ANTI_REPLAY_ENABLED MBEDTLS_SSL_ANTI_REPLAY_ENABLED
 #define SSL_ARC4_DISABLED MBEDTLS_SSL_ARC4_DISABLED
 #define SSL_ARC4_ENABLED MBEDTLS_SSL_ARC4_ENABLED
-#define SSL_BUFFER_LEN MBEDTLS_SSL_BUFFER_LEN
+#define SSL_BUFFER_LEN ( ( ( MBEDTLS_SSL_IN_BUFFER_LEN ) < ( MBEDTLS_SSL_OUT_BUFFER_LEN ) ) \
+                         ? ( MBEDTLS_SSL_IN_BUFFER_LEN ) : ( MBEDTLS_SSL_OUT_BUFFER_LEN ) )
 #define SSL_CACHE_DEFAULT_MAX_ENTRIES MBEDTLS_SSL_CACHE_DEFAULT_MAX_ENTRIES
 #define SSL_CACHE_DEFAULT_TIMEOUT MBEDTLS_SSL_CACHE_DEFAULT_TIMEOUT
 #define SSL_CBC_RECORD_SPLITTING_DISABLED MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index e13026e..17208b5 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -2951,7 +2951,51 @@
 //#define MBEDTLS_SSL_CACHE_DEFAULT_MAX_ENTRIES      50 /**< Maximum entries in cache */
 
 /* SSL options */
-//#define MBEDTLS_SSL_MAX_CONTENT_LEN             16384 /**< Maxium fragment length in bytes, determines the size of each of the two internal I/O buffers */
+
+/** \def MBEDTLS_SSL_MAX_CONTENT_LEN
+ *
+ * Maximum fragment length in bytes.
+ *
+ * Determines the size of both the incoming and outgoing TLS I/O buffers.
+ *
+ * Uncommenting MBEDTLS_SSL_IN_CONTENT_LEN and/or MBEDTLS_SSL_OUT_CONTENT_LEN
+ * will override this length by setting maximum incoming and/or outgoing
+ * fragment length, respectively.
+ */
+//#define MBEDTLS_SSL_MAX_CONTENT_LEN             16384
+
+/** \def MBEDTLS_SSL_IN_CONTENT_LEN
+ *
+ * Maximum incoming fragment length in bytes.
+ *
+ * Uncomment to set the size of the inward TLS buffer independently of the
+ * outward buffer.
+ */
+//#define MBEDTLS_SSL_IN_CONTENT_LEN              16384
+
+/** \def MBEDTLS_SSL_OUT_CONTENT_LEN
+ *
+ * Maximum outgoing fragment length in bytes.
+ *
+ * Uncomment to set the size of the outward TLS buffer independently of the
+ * inward buffer.
+ *
+ * It is possible to save RAM by setting a smaller outward buffer, while keeping
+ * the default inward 16384 byte buffer to conform to the TLS specification.
+ *
+ * The minimum required outward buffer size is determined by the handshake
+ * protocol's usage. Handshaking will fail if the outward buffer is too small.
+ * The specific size requirement depends on the configured ciphers and any
+ * certificate data which is sent during the handshake.
+ *
+ * For absolute minimum RAM usage, it's best to enable
+ * MBEDTLS_SSL_MAX_FRAGMENT_LENGTH and reduce MBEDTLS_SSL_MAX_CONTENT_LEN. This
+ * reduces both incoming and outgoing buffer sizes. However this is only
+ * guaranteed if the other end of the connection also supports the TLS
+ * max_fragment_len extension. Otherwise the connection may fail.
+ */
+//#define MBEDTLS_SSL_OUT_CONTENT_LEN             16384
+
 //#define MBEDTLS_SSL_DEFAULT_TICKET_LIFETIME     86400 /**< Lifetime of session tickets (if enabled) */
 //#define MBEDTLS_PSK_MAX_LEN               32 /**< Max size of TLS pre-shared keys, in bytes (default 256 bits) */
 //#define MBEDTLS_SSL_COOKIE_TIMEOUT        60 /**< Default expiration delay of DTLS cookies, in seconds if HAVE_TIME, or in number of cookies issued */
@@ -3028,7 +3072,7 @@
 /* \} name SECTION: Customisation configuration options */
 
 /* Target and application specific configurations */
-//#define YOTTA_CFG_MBEDTLS_TARGET_CONFIG_FILE "mbedtls/target_config.h"
+//#define YOTTA_CFG_MBEDTLS_TARGET_CONFIG_FILE "target_config.h"
 
 #if defined(TARGET_LIKE_MBED) && defined(YOTTA_CFG_MBEDTLS_TARGET_CONFIG_FILE)
 #include YOTTA_CFG_MBEDTLS_TARGET_CONFIG_FILE
diff --git a/include/mbedtls/ctr_drbg.h b/include/mbedtls/ctr_drbg.h
index dcbc047..3835d72 100644
--- a/include/mbedtls/ctr_drbg.h
+++ b/include/mbedtls/ctr_drbg.h
@@ -36,7 +36,7 @@
 #include "aes.h"
 
 #if defined(MBEDTLS_THREADING_C)
-#include "mbedtls/threading.h"
+#include "threading.h"
 #endif
 
 #define MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED        -0x0034  /**< The entropy source failed. */
diff --git a/include/mbedtls/hmac_drbg.h b/include/mbedtls/hmac_drbg.h
index e0821cf..2608de8 100644
--- a/include/mbedtls/hmac_drbg.h
+++ b/include/mbedtls/hmac_drbg.h
@@ -27,7 +27,7 @@
 #include "md.h"
 
 #if defined(MBEDTLS_THREADING_C)
-#include "mbedtls/threading.h"
+#include "threading.h"
 #endif
 
 /*
diff --git a/include/mbedtls/net.h b/include/mbedtls/net.h
index 28ae821..6c13b53 100644
--- a/include/mbedtls/net.h
+++ b/include/mbedtls/net.h
@@ -1,7 +1,7 @@
 /**
  * \file net.h
  *
- * \brief Deprecated header file that includes mbedtls/net_sockets.h
+ * \brief Deprecated header file that includes net_sockets.h
  *
  * \deprecated Superseded by mbedtls/net_sockets.h
  */
@@ -25,7 +25,7 @@
  */
 
 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
-#include "mbedtls/net_sockets.h"
+#include "net_sockets.h"
 #if defined(MBEDTLS_DEPRECATED_WARNING)
 #warning "Deprecated header file: Superseded by mbedtls/net_sockets.h"
 #endif /* MBEDTLS_DEPRECATED_WARNING */
diff --git a/include/mbedtls/platform.h b/include/mbedtls/platform.h
index 9d9c529..624cc64 100644
--- a/include/mbedtls/platform.h
+++ b/include/mbedtls/platform.h
@@ -40,7 +40,7 @@
 #endif
 
 #if defined(MBEDTLS_HAVE_TIME)
-#include "mbedtls/platform_time.h"
+#include "platform_time.h"
 #endif
 
 #ifdef __cplusplus
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 4513550..3858559 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -62,7 +62,7 @@
 #endif
 
 #if defined(MBEDTLS_HAVE_TIME)
-#include "mbedtls/platform_time.h"
+#include "platform_time.h"
 #endif
 
 /*
@@ -220,7 +220,7 @@
 #endif
 
 /*
- * Maxium fragment length in bytes,
+ * Maximum fragment length in bytes,
  * determines the size of each of the two internal I/O buffers.
  *
  * Note: the RFC defines the default size of SSL / TLS messages. If you
@@ -234,6 +234,14 @@
 #define MBEDTLS_SSL_MAX_CONTENT_LEN         16384   /**< Size of the input / output buffer */
 #endif
 
+#if !defined(MBEDTLS_SSL_IN_CONTENT_LEN)
+#define MBEDTLS_SSL_IN_CONTENT_LEN MBEDTLS_SSL_MAX_CONTENT_LEN
+#endif
+
+#if !defined(MBEDTLS_SSL_OUT_CONTENT_LEN)
+#define MBEDTLS_SSL_OUT_CONTENT_LEN MBEDTLS_SSL_MAX_CONTENT_LEN
+#endif
+
 /* \} name SECTION: Module settings */
 
 /*
@@ -2418,7 +2426,8 @@
 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
 /**
  * \brief          Set the maximum fragment length to emit and/or negotiate
- *                 (Default: MBEDTLS_SSL_MAX_CONTENT_LEN, usually 2^14 bytes)
+ *                 (Default: the smaller of MBEDTLS_SSL_IN_CONTENT_LEN and
+ *                 MBEDTLS_SSL_OUT_CONTENT_LEN, usually 2^14 bytes)
  *                 (Server: set maximum fragment length to emit,
  *                 usually negotiated by the client during handshake
  *                 (Client: set maximum fragment length to emit *and*
@@ -2907,17 +2916,19 @@
  *                 or MBEDTLS_ERR_SSL_WANT_WRITE or MBEDTLS_ERR_SSL_WANT_READ,
  *                 or another negative error code.
  *
- * \note           If this function returns something other than a positive value
- *                 or MBEDTLS_ERR_SSL_WANT_READ/WRITE, you must stop using
- *                 the SSL context for reading or writing, and either free it or
- *                 call \c mbedtls_ssl_session_reset() on it before re-using it
- *                 for a new connection; the current connection must be closed.
+ * \note           If this function returns something other than 0, a positive
+ *                 value or MBEDTLS_ERR_SSL_WANT_READ/WRITE, you must stop
+ *                 using the SSL context for reading or writing, and either
+ *                 free it or call \c mbedtls_ssl_session_reset() on it before
+ *                 re-using it for a new connection; the current connection
+ *                 must be closed.
  *
  * \note           When this function returns MBEDTLS_ERR_SSL_WANT_WRITE/READ,
  *                 it must be called later with the *same* arguments,
- *                 until it returns a positive value. When the function returns
- *                 MBEDTLS_ERR_SSL_WANT_WRITE there may be some partial
- *                 data in the output buffer, however this is not yet sent.
+ *                 until it returns a value greater that or equal to 0. When
+ *                 the function returns MBEDTLS_ERR_SSL_WANT_WRITE there may be
+ *                 some partial data in the output buffer, however this is not
+ *                 yet sent.
  *
  * \note           If the requested length is greater than the maximum
  *                 fragment length (either the built-in limit or the one set
@@ -2926,6 +2937,9 @@
  *                 - with DTLS, MBEDTLS_ERR_SSL_BAD_INPUT_DATA is returned.
  *                 \c mbedtls_ssl_get_max_frag_len() may be used to query the
  *                 active maximum fragment length.
+ *
+ * \note           Attempting to write 0 bytes will result in an empty TLS
+ *                 application record being sent.
  */
 int mbedtls_ssl_write( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len );
 
diff --git a/include/mbedtls/ssl_ciphersuites.h b/include/mbedtls/ssl_ciphersuites.h
index 7d5eba0..cda8b48 100644
--- a/include/mbedtls/ssl_ciphersuites.h
+++ b/include/mbedtls/ssl_ciphersuites.h
@@ -271,6 +271,15 @@
 
 #define MBEDTLS_TLS_ECJPAKE_WITH_AES_128_CCM_8          0xC0FF  /**< experimental */
 
+/* RFC 7905 */
+#define MBEDTLS_TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256   0xCCA8 /**< TLS 1.2 */
+#define MBEDTLS_TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 0xCCA9 /**< TLS 1.2 */
+#define MBEDTLS_TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256     0xCCAA /**< TLS 1.2 */
+#define MBEDTLS_TLS_PSK_WITH_CHACHA20_POLY1305_SHA256         0xCCAB /**< TLS 1.2 */
+#define MBEDTLS_TLS_ECDHE_PSK_WITH_CHACHA20_POLY1305_SHA256   0xCCAC /**< TLS 1.2 */
+#define MBEDTLS_TLS_DHE_PSK_WITH_CHACHA20_POLY1305_SHA256     0xCCAD /**< TLS 1.2 */
+#define MBEDTLS_TLS_RSA_PSK_WITH_CHACHA20_POLY1305_SHA256     0xCCAE /**< TLS 1.2 */
+
 /* Reminder: update mbedtls_ssl_premaster_secret when adding a new key exchange.
  * Reminder: update MBEDTLS_KEY_EXCHANGE__xxx below
  */
diff --git a/include/mbedtls/ssl_internal.h b/include/mbedtls/ssl_internal.h
index f48fe90..d214703 100644
--- a/include/mbedtls/ssl_internal.h
+++ b/include/mbedtls/ssl_internal.h
@@ -143,32 +143,73 @@
 #define MBEDTLS_SSL_PADDING_ADD              0
 #endif
 
-#define MBEDTLS_SSL_PAYLOAD_LEN ( MBEDTLS_SSL_MAX_CONTENT_LEN    \
-                        + MBEDTLS_SSL_COMPRESSION_ADD            \
-                        + MBEDTLS_MAX_IV_LENGTH                  \
-                        + MBEDTLS_SSL_MAC_ADD                    \
-                        + MBEDTLS_SSL_PADDING_ADD                \
-                        )
+#define MBEDTLS_SSL_PAYLOAD_OVERHEAD ( MBEDTLS_SSL_COMPRESSION_ADD +    \
+                                       MBEDTLS_MAX_IV_LENGTH +          \
+                                       MBEDTLS_SSL_MAC_ADD +            \
+                                       MBEDTLS_SSL_PADDING_ADD          \
+                                       )
+
+#define MBEDTLS_SSL_IN_PAYLOAD_LEN ( MBEDTLS_SSL_PAYLOAD_OVERHEAD + \
+                                     ( MBEDTLS_SSL_IN_CONTENT_LEN ) )
+
+#define MBEDTLS_SSL_OUT_PAYLOAD_LEN ( MBEDTLS_SSL_PAYLOAD_OVERHEAD + \
+                                      ( MBEDTLS_SSL_OUT_CONTENT_LEN ) )
+
+/* Maximum length we can advertise as our max content length for
+   RFC 6066 max_fragment_length extension negotiation purposes
+   (the lesser of both sizes, if they are unequal.)
+ */
+#define MBEDTLS_TLS_EXT_ADV_CONTENT_LEN (                            \
+        (MBEDTLS_SSL_IN_CONTENT_LEN > MBEDTLS_SSL_OUT_CONTENT_LEN)   \
+        ? ( MBEDTLS_SSL_OUT_CONTENT_LEN )                            \
+        : ( MBEDTLS_SSL_IN_CONTENT_LEN )                             \
+        )
 
 /*
  * Check that we obey the standard's message size bounds
  */
 
 #if MBEDTLS_SSL_MAX_CONTENT_LEN > 16384
-#error Bad configuration - record content too large.
+#error "Bad configuration - record content too large."
 #endif
 
-#if MBEDTLS_SSL_PAYLOAD_LEN > 16384 + 2048
-#error Bad configuration - protected record payload too large.
+#if MBEDTLS_SSL_IN_CONTENT_LEN > MBEDTLS_SSL_MAX_CONTENT_LEN
+#error "Bad configuration - incoming record content should not be larger than MBEDTLS_SSL_MAX_CONTENT_LEN."
 #endif
 
+#if MBEDTLS_SSL_OUT_CONTENT_LEN > MBEDTLS_SSL_MAX_CONTENT_LEN
+#error "Bad configuration - outgoing record content should not be larger than MBEDTLS_SSL_MAX_CONTENT_LEN."
+#endif
+
+#if MBEDTLS_SSL_IN_PAYLOAD_LEN > MBEDTLS_SSL_MAX_CONTENT_LEN + 2048
+#error "Bad configuration - incoming protected record payload too large."
+#endif
+
+#if MBEDTLS_SSL_OUT_PAYLOAD_LEN > MBEDTLS_SSL_MAX_CONTENT_LEN + 2048
+#error "Bad configuration - outgoing protected record payload too large."
+#endif
+
+/* Calculate buffer sizes */
+
 /* Note: Even though the TLS record header is only 5 bytes
    long, we're internally using 8 bytes to store the
    implicit sequence number. */
 #define MBEDTLS_SSL_HEADER_LEN 13
 
-#define MBEDTLS_SSL_BUFFER_LEN  \
-    ( ( MBEDTLS_SSL_HEADER_LEN ) + ( MBEDTLS_SSL_PAYLOAD_LEN ) )
+#define MBEDTLS_SSL_IN_BUFFER_LEN  \
+    ( ( MBEDTLS_SSL_HEADER_LEN ) + ( MBEDTLS_SSL_IN_PAYLOAD_LEN ) )
+
+#define MBEDTLS_SSL_OUT_BUFFER_LEN  \
+    ( ( MBEDTLS_SSL_HEADER_LEN ) + ( MBEDTLS_SSL_OUT_PAYLOAD_LEN ) )
+
+#ifdef MBEDTLS_ZLIB_SUPPORT
+/* Compression buffer holds both IN and OUT buffers, so should be size of the larger */
+#define MBEDTLS_SSL_COMPRESS_BUFFER_LEN (                               \
+        ( MBEDTLS_SSL_IN_BUFFER_LEN > MBEDTLS_SSL_OUT_BUFFER_LEN )      \
+        ? MBEDTLS_SSL_IN_BUFFER_LEN                                     \
+        : MBEDTLS_SSL_OUT_BUFFER_LEN                                    \
+        )
+#endif
 
 /*
  * TLS extension flags (for extensions with outgoing ServerHello content
diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index bb3d19c..4aba062 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -101,6 +101,17 @@
     set(libs ${libs} ws2_32)
 endif(WIN32)
 
+if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+    SET(CMAKE_C_ARCHIVE_CREATE   "<CMAKE_AR> Scr <TARGET> <LINK_FLAGS> <OBJECTS>")
+    SET(CMAKE_CXX_ARCHIVE_CREATE "<CMAKE_AR> Scr <TARGET> <LINK_FLAGS> <OBJECTS>")
+    SET(CMAKE_C_ARCHIVE_FINISH   "<CMAKE_RANLIB> -no_warning_for_no_symbols -c <TARGET>")
+    SET(CMAKE_CXX_ARCHIVE_FINISH "<CMAKE_RANLIB> -no_warning_for_no_symbols -c <TARGET>")
+endif()
+
+if(HAIKU)
+    set(libs ${libs} network)
+endif(HAIKU)
+
 if(USE_PKCS11_HELPER_LIBRARY)
     set(libs ${libs} pkcs11-helper)
 endif(USE_PKCS11_HELPER_LIBRARY)
diff --git a/library/Makefile b/library/Makefile
index b42ebc8..b1597e0 100644
--- a/library/Makefile
+++ b/library/Makefile
@@ -21,6 +21,10 @@
 # if were running on Windows build for Windows
 ifdef WINDOWS
 WINDOWS_BUILD=1
+else ifeq ($(shell uname -s),Darwin)
+ifeq ($(AR),ar)
+APPLE_BUILD ?= 1
+endif
 endif
 
 # To compile as a shared library:
@@ -35,16 +39,28 @@
 SOEXT_X509=so.0
 SOEXT_CRYPTO=so.3
 
-# Set DLEXT=dylib to compile as a shared library for Mac OS X
-DLEXT ?= so
-
 # Set AR_DASH= (empty string) to use an ar implentation that does not accept
 # the - prefix for command line options (e.g. llvm-ar)
 AR_DASH ?= -
 
-# Windows shared library extension:
+ARFLAGS = $(AR_DASH)src
+ifdef APPLE_BUILD
+ifneq ($(APPLE_BUILD),0)
+ARFLAGS = $(AR_DASH)Src
+RLFLAGS = -no_warning_for_no_symbols -c
+RL ?= ranlib
+endif
+endif
+
+DLEXT ?= so
 ifdef WINDOWS_BUILD
-DLEXT=dll
+# Windows shared library extension:
+DLEXT = dll
+else ifdef APPLE_BUILD
+ifneq ($(APPLE_BUILD),0)
+# Mac OS X shared library extension:
+DLEXT = dylib
+endif
 endif
 
 OBJS_CRYPTO=	aes.o		aesni.o		arc4.o		\
@@ -97,9 +113,13 @@
 # tls
 libmbedtls.a: $(OBJS_TLS)
 	echo "  AR    $@"
-	$(AR) $(AR_DASH)rc $@ $(OBJS_TLS)
+	$(AR) $(ARFLAGS) $@ $(OBJS_TLS)
+ifdef APPLE_BUILD
+ifneq ($(APPLE_BUILD),0)
 	echo "  RL    $@"
-	$(AR) $(AR_DASH)s $@
+	$(RL) $(RLFLAGS) $@
+endif
+endif
 
 libmbedtls.$(SOEXT_TLS): $(OBJS_TLS) libmbedx509.so
 	echo "  LD    $@"
@@ -120,9 +140,13 @@
 # x509
 libmbedx509.a: $(OBJS_X509)
 	echo "  AR    $@"
-	$(AR) $(AR_DASH)rc $@ $(OBJS_X509)
+	$(AR) $(ARFLAGS) $@ $(OBJS_X509)
+ifdef APPLE_BUILD
+ifneq ($(APPLE_BUILD),0)
 	echo "  RL    $@"
-	$(AR) $(AR_DASH)s $@
+	$(RL) $(RLFLAGS) $@
+endif
+endif
 
 libmbedx509.$(SOEXT_X509): $(OBJS_X509) libmbedcrypto.so
 	echo "  LD    $@"
@@ -143,9 +167,13 @@
 # crypto
 libmbedcrypto.a: $(OBJS_CRYPTO)
 	echo "  AR    $@"
-	$(AR) $(AR_DASH)rc $@ $(OBJS_CRYPTO)
+	$(AR) $(ARFLAGS) $@ $(OBJS_CRYPTO)
+ifdef APPLE_BUILD
+ifneq ($(APPLE_BUILD),0)
 	echo "  RL    $@"
-	$(AR) $(AR_DASH)s $@
+	$(RL) $(RLFLAGS) $@
+endif
+endif
 
 libmbedcrypto.$(SOEXT_CRYPTO): $(OBJS_CRYPTO)
 	echo "  LD    $@"
diff --git a/library/cipher.c b/library/cipher.c
index a913913..7ae6c4a 100644
--- a/library/cipher.c
+++ b/library/cipher.c
@@ -65,11 +65,6 @@
 #define mbedtls_free   free
 #endif
 
-#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER)
-#define MBEDTLS_CIPHER_MODE_STREAM
-#endif
-
-
 #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
 /* Compare the contents of two buffers in constant time.
  * Returns 0 if the contents are bitwise identical, otherwise returns
diff --git a/library/entropy_poll.c b/library/entropy_poll.c
index fd96258..308c53c 100644
--- a/library/entropy_poll.c
+++ b/library/entropy_poll.c
@@ -45,7 +45,8 @@
 #if !defined(MBEDTLS_NO_PLATFORM_ENTROPY)
 
 #if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
-    !defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__)
+    !defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__) && \
+    !defined(__HAIKU__)
 #error "Platform entropy sources only work on Unix and Windows, see MBEDTLS_NO_PLATFORM_ENTROPY in config.h"
 #endif
 
diff --git a/library/net_sockets.c b/library/net_sockets.c
index 202da01..e5efce0 100644
--- a/library/net_sockets.c
+++ b/library/net_sockets.c
@@ -28,7 +28,8 @@
 #if defined(MBEDTLS_NET_C)
 
 #if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
-    !defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__)
+    !defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__) && \
+    !defined(__HAIKU__)
 #error "This module only works on Unix and Windows, see MBEDTLS_NET_C in config.h"
 #endif
 
diff --git a/library/ssl_ciphersuites.c b/library/ssl_ciphersuites.c
index 2e9a0fd..59cdc7a 100644
--- a/library/ssl_ciphersuites.c
+++ b/library/ssl_ciphersuites.c
@@ -47,7 +47,7 @@
  * 1. By key exchange:
  *    Forward-secure non-PSK > forward-secure PSK > ECJPAKE > other non-PSK > other PSK
  * 2. By key length and cipher:
- *    AES-256 > Camellia-256 > ARIA-256 > AES-128 > Camellia-128 > ARIA-128 > 3DES
+ *    ChaCha > AES-256 > Camellia-256 > ARIA-256 > AES-128 > Camellia-128 > ARIA-128 > 3DES
  * 3. By cipher mode when relevant GCM > CCM > CBC > CCM_8
  * 4. By hash function used when relevant
  * 5. By key exchange/auth again: EC > non-EC
@@ -57,6 +57,11 @@
 #if defined(MBEDTLS_SSL_CIPHERSUITES)
     MBEDTLS_SSL_CIPHERSUITES,
 #else
+    /* Chacha-Poly ephemeral suites */
+    MBEDTLS_TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
+    MBEDTLS_TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,
+    MBEDTLS_TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
+
     /* All AES-256 ephemeral suites */
     MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
     MBEDTLS_TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
@@ -127,6 +132,8 @@
     MBEDTLS_TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA,
 
     /* The PSK ephemeral suites */
+    MBEDTLS_TLS_ECDHE_PSK_WITH_CHACHA20_POLY1305_SHA256,
+    MBEDTLS_TLS_DHE_PSK_WITH_CHACHA20_POLY1305_SHA256,
     MBEDTLS_TLS_DHE_PSK_WITH_AES_256_GCM_SHA384,
     MBEDTLS_TLS_DHE_PSK_WITH_AES_256_CCM,
     MBEDTLS_TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA384,
@@ -227,6 +234,7 @@
     MBEDTLS_TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA,
 
     /* The RSA PSK suites */
+    MBEDTLS_TLS_RSA_PSK_WITH_CHACHA20_POLY1305_SHA256,
     MBEDTLS_TLS_RSA_PSK_WITH_AES_256_GCM_SHA384,
     MBEDTLS_TLS_RSA_PSK_WITH_AES_256_CBC_SHA384,
     MBEDTLS_TLS_RSA_PSK_WITH_AES_256_CBC_SHA,
@@ -246,6 +254,7 @@
     MBEDTLS_TLS_RSA_PSK_WITH_3DES_EDE_CBC_SHA,
 
     /* The PSK suites */
+    MBEDTLS_TLS_PSK_WITH_CHACHA20_POLY1305_SHA256,
     MBEDTLS_TLS_PSK_WITH_AES_256_GCM_SHA384,
     MBEDTLS_TLS_PSK_WITH_AES_256_CCM,
     MBEDTLS_TLS_PSK_WITH_AES_256_CBC_SHA384,
@@ -312,6 +321,75 @@
 
 static const mbedtls_ssl_ciphersuite_t ciphersuite_definitions[] =
 {
+#if defined(MBEDTLS_CHACHAPOLY_C) && \
+    defined(MBEDTLS_SHA256_C) && \
+    defined(MBEDTLS_SSL_PROTO_TLS1_2)
+#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED)
+    { MBEDTLS_TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
+      "TLS-ECDHE-RSA-WITH-CHACHA20-POLY1305-SHA256",
+      MBEDTLS_CIPHER_CHACHA20_POLY1305, MBEDTLS_MD_SHA256,
+      MBEDTLS_KEY_EXCHANGE_ECDHE_RSA,
+      MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3,
+      MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3,
+      0 },
+#endif
+#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
+    { MBEDTLS_TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,
+      "TLS-ECDHE-ECDSA-WITH-CHACHA20-POLY1305-SHA256",
+      MBEDTLS_CIPHER_CHACHA20_POLY1305, MBEDTLS_MD_SHA256,
+      MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA,
+      MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3,
+      MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3,
+      0 },
+#endif
+#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED)
+    { MBEDTLS_TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
+      "TLS-DHE-RSA-WITH-CHACHA20-POLY1305-SHA256",
+      MBEDTLS_CIPHER_CHACHA20_POLY1305, MBEDTLS_MD_SHA256,
+      MBEDTLS_KEY_EXCHANGE_DHE_RSA,
+      MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3,
+      MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3,
+      0 },
+#endif
+#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
+    { MBEDTLS_TLS_PSK_WITH_CHACHA20_POLY1305_SHA256,
+      "TLS-PSK-WITH-CHACHA20-POLY1305-SHA256",
+      MBEDTLS_CIPHER_CHACHA20_POLY1305, MBEDTLS_MD_SHA256,
+      MBEDTLS_KEY_EXCHANGE_PSK,
+      MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3,
+      MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3,
+      0 },
+#endif
+#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
+    { MBEDTLS_TLS_ECDHE_PSK_WITH_CHACHA20_POLY1305_SHA256,
+      "TLS-ECDHE-PSK-WITH-CHACHA20-POLY1305-SHA256",
+      MBEDTLS_CIPHER_CHACHA20_POLY1305, MBEDTLS_MD_SHA256,
+      MBEDTLS_KEY_EXCHANGE_ECDHE_PSK,
+      MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3,
+      MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3,
+      0 },
+#endif
+#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
+    { MBEDTLS_TLS_DHE_PSK_WITH_CHACHA20_POLY1305_SHA256,
+      "TLS-DHE-PSK-WITH-CHACHA20-POLY1305-SHA256",
+      MBEDTLS_CIPHER_CHACHA20_POLY1305, MBEDTLS_MD_SHA256,
+      MBEDTLS_KEY_EXCHANGE_DHE_PSK,
+      MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3,
+      MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3,
+      0 },
+#endif
+#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
+    { MBEDTLS_TLS_RSA_PSK_WITH_CHACHA20_POLY1305_SHA256,
+      "TLS-RSA-PSK-WITH-CHACHA20-POLY1305-SHA256",
+      MBEDTLS_CIPHER_CHACHA20_POLY1305, MBEDTLS_MD_SHA256,
+      MBEDTLS_KEY_EXCHANGE_RSA_PSK,
+      MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3,
+      MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_3,
+      0 },
+#endif
+#endif /* MBEDTLS_CHACHAPOLY_C &&
+          MBEDTLS_SHA256_C &&
+          MBEDTLS_SSL_PROTO_TLS1_2 */
 #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
 #if defined(MBEDTLS_AES_C)
 #if defined(MBEDTLS_SHA1_C)
diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index e537f9d..ba59c48 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -57,7 +57,7 @@
                                     size_t *olen )
 {
     unsigned char *p = buf;
-    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
+    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
     size_t hostname_len;
 
     *olen = 0;
@@ -127,7 +127,7 @@
                                          size_t *olen )
 {
     unsigned char *p = buf;
-    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
+    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
 
     *olen = 0;
 
@@ -171,7 +171,7 @@
                                                 size_t *olen )
 {
     unsigned char *p = buf;
-    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
+    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
     size_t sig_alg_len = 0;
     const int *md;
 #if defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C)
@@ -256,7 +256,7 @@
                                                      size_t *olen )
 {
     unsigned char *p = buf;
-    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
+    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
     unsigned char *elliptic_curve_list = p + 6;
     size_t elliptic_curve_len = 0;
     const mbedtls_ecp_curve_info *info;
@@ -329,7 +329,7 @@
                                                    size_t *olen )
 {
     unsigned char *p = buf;
-    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
+    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
 
     *olen = 0;
 
@@ -362,7 +362,7 @@
 {
     int ret;
     unsigned char *p = buf;
-    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
+    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
     size_t kkpp_len;
 
     *olen = 0;
@@ -439,7 +439,7 @@
                                                size_t *olen )
 {
     unsigned char *p = buf;
-    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
+    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
 
     *olen = 0;
 
@@ -472,7 +472,7 @@
                                           unsigned char *buf, size_t *olen )
 {
     unsigned char *p = buf;
-    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
+    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
 
     *olen = 0;
 
@@ -504,7 +504,7 @@
                                        unsigned char *buf, size_t *olen )
 {
     unsigned char *p = buf;
-    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
+    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
 
     *olen = 0;
 
@@ -538,7 +538,7 @@
                                        unsigned char *buf, size_t *olen )
 {
     unsigned char *p = buf;
-    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
+    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
 
     *olen = 0;
 
@@ -572,7 +572,7 @@
                                           unsigned char *buf, size_t *olen )
 {
     unsigned char *p = buf;
-    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
+    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
     size_t tlen = ssl->session_negotiate->ticket_len;
 
     *olen = 0;
@@ -616,7 +616,7 @@
                                 unsigned char *buf, size_t *olen )
 {
     unsigned char *p = buf;
-    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
+    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
     size_t alpnlen = 0;
     const char **cur;
 
@@ -1247,14 +1247,14 @@
     size_t list_size;
     const unsigned char *p;
 
-    list_size = buf[0];
-    if( list_size + 1 != len )
+    if( len == 0 || (size_t)( buf[0] + 1 ) != len )
     {
         MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
         mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
                                         MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
         return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
     }
+    list_size = buf[0];
 
     p = buf + 1;
     while( list_size > 0 )
@@ -2117,7 +2117,7 @@
     size_t len_bytes = ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ? 0 : 2;
     unsigned char *p = ssl->handshake->premaster + pms_offset;
 
-    if( offset + len_bytes > MBEDTLS_SSL_MAX_CONTENT_LEN )
+    if( offset + len_bytes > MBEDTLS_SSL_OUT_CONTENT_LEN )
     {
         MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small for encrypted pms" ) );
         return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
@@ -2160,7 +2160,7 @@
     if( ( ret = mbedtls_pk_encrypt( &ssl->session_negotiate->peer_cert->pk,
                             p, ssl->handshake->pmslen,
                             ssl->out_msg + offset + len_bytes, olen,
-                            MBEDTLS_SSL_MAX_CONTENT_LEN - offset - len_bytes,
+                            MBEDTLS_SSL_OUT_CONTENT_LEN - offset - len_bytes,
                             ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
     {
         MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_rsa_pkcs1_encrypt", ret );
@@ -2709,7 +2709,7 @@
      * therefore the buffer length at this point must be greater than that
      * regardless of the actual code path.
      */
-    if( ssl->in_hslen <= mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n )
+    if( ssl->in_hslen <= mbedtls_ssl_hs_hdr_len( ssl ) + 3 + n )
     {
         MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
         mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
@@ -2926,7 +2926,7 @@
         i = 4;
         n = ssl->conf->psk_identity_len;
 
-        if( i + 2 + n > MBEDTLS_SSL_MAX_CONTENT_LEN )
+        if( i + 2 + n > MBEDTLS_SSL_OUT_CONTENT_LEN )
         {
             MBEDTLS_SSL_DEBUG_MSG( 1, ( "psk identity too long or "
                                         "SSL buffer too short" ) );
@@ -2962,7 +2962,7 @@
              */
             n = ssl->handshake->dhm_ctx.len;
 
-            if( i + 2 + n > MBEDTLS_SSL_MAX_CONTENT_LEN )
+            if( i + 2 + n > MBEDTLS_SSL_OUT_CONTENT_LEN )
             {
                 MBEDTLS_SSL_DEBUG_MSG( 1, ( "psk identity or DHM size too long"
                                             " or SSL buffer too short" ) );
@@ -2991,7 +2991,7 @@
              * ClientECDiffieHellmanPublic public;
              */
             ret = mbedtls_ecdh_make_public( &ssl->handshake->ecdh_ctx, &n,
-                    &ssl->out_msg[i], MBEDTLS_SSL_MAX_CONTENT_LEN - i,
+                    &ssl->out_msg[i], MBEDTLS_SSL_OUT_CONTENT_LEN - i,
                     ssl->conf->f_rng, ssl->conf->p_rng );
             if( ret != 0 )
             {
@@ -3032,7 +3032,7 @@
         i = 4;
 
         ret = mbedtls_ecjpake_write_round_two( &ssl->handshake->ecjpake_ctx,
-                ssl->out_msg + i, MBEDTLS_SSL_MAX_CONTENT_LEN - i, &n,
+                ssl->out_msg + i, MBEDTLS_SSL_OUT_CONTENT_LEN - i, &n,
                 ssl->conf->f_rng, ssl->conf->p_rng );
         if( ret != 0 )
         {
diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index 0ccab58..52087ae 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -91,6 +91,13 @@
 
     MBEDTLS_SSL_DEBUG_MSG( 3, ( "parse ServerName extension" ) );
 
+    if( len < 2 )
+    {
+        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+                                       MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+        return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
+    }
     servername_list_size = ( ( buf[0] << 8 ) | ( buf[1] ) );
     if( servername_list_size + 2 != len )
     {
@@ -101,7 +108,7 @@
     }
 
     p = buf + 2;
-    while( servername_list_size > 0 )
+    while( servername_list_size > 2 )
     {
         hostname_len = ( ( p[1] << 8 ) | p[2] );
         if( hostname_len + 3 > servername_list_size )
@@ -205,6 +212,12 @@
     mbedtls_md_type_t md_cur;
     mbedtls_pk_type_t sig_cur;
 
+    if ( len < 2 ) {
+        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+                                       MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+        return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
+    }
     sig_alg_list_size = ( ( buf[0] << 8 ) | ( buf[1] ) );
     if( sig_alg_list_size + 2 != len ||
         sig_alg_list_size % 2 != 0 )
@@ -273,6 +286,12 @@
     const unsigned char *p;
     const mbedtls_ecp_curve_info *curve_info, **curves;
 
+    if ( len < 2 ) {
+        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+                                       MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+        return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
+    }
     list_size = ( ( buf[0] << 8 ) | ( buf[1] ) );
     if( list_size + 2 != len ||
         list_size % 2 != 0 )
@@ -332,14 +351,14 @@
     size_t list_size;
     const unsigned char *p;
 
-    list_size = buf[0];
-    if( list_size + 1 != len )
+    if( len == 0 || (size_t)( buf[0] + 1 ) != len )
     {
         MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
         mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
                                         MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
         return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
     }
+    list_size = buf[0];
 
     p = buf + 1;
     while( list_size > 0 )
@@ -1303,7 +1322,7 @@
     else
 #endif
     {
-        if( msg_len > MBEDTLS_SSL_MAX_CONTENT_LEN )
+        if( msg_len > MBEDTLS_SSL_IN_CONTENT_LEN )
         {
             MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
             return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
@@ -1656,10 +1675,16 @@
 
         while( ext_len != 0 )
         {
-            unsigned int ext_id   = ( ( ext[0] <<  8 )
-                                    | ( ext[1]       ) );
-            unsigned int ext_size = ( ( ext[2] <<  8 )
-                                    | ( ext[3]       ) );
+            unsigned int ext_id;
+            unsigned int ext_size;
+            if ( ext_len < 4 ) {
+                MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+                mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+                                               MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+                return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
+            }
+            ext_id   = ( ( ext[0] <<  8 ) | ( ext[1] ) );
+            ext_size = ( ( ext[2] <<  8 ) | ( ext[3] ) );
 
             if( ext_size + 4 > ext_len )
             {
@@ -2235,7 +2260,7 @@
 {
     int ret;
     unsigned char *p = buf;
-    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
+    const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
     size_t kkpp_len;
 
     *olen = 0;
@@ -2342,7 +2367,7 @@
     cookie_len_byte = p++;
 
     if( ( ret = ssl->conf->f_cookie_write( ssl->conf->p_cookie,
-                                     &p, ssl->out_buf + MBEDTLS_SSL_BUFFER_LEN,
+                                     &p, ssl->out_buf + MBEDTLS_SSL_OUT_BUFFER_LEN,
                                      ssl->cli_id, ssl->cli_id_len ) ) != 0 )
     {
         MBEDTLS_SSL_DEBUG_RET( 1, "f_cookie_write", ret );
@@ -2638,7 +2663,7 @@
     size_t dn_size, total_dn_size; /* excluding length bytes */
     size_t ct_len, sa_len; /* including length bytes */
     unsigned char *buf, *p;
-    const unsigned char * const end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
+    const unsigned char * const end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
     const mbedtls_x509_crt *crt;
     int authmode;
 
@@ -2839,7 +2864,7 @@
      * ssl_write_server_key_exchange also takes care of incrementing
      * ssl->out_msglen. */
     unsigned char *sig_start = ssl->out_msg + ssl->out_msglen + 2;
-    size_t sig_max_len = ( ssl->out_buf + MBEDTLS_SSL_MAX_CONTENT_LEN
+    size_t sig_max_len = ( ssl->out_buf + MBEDTLS_SSL_OUT_CONTENT_LEN
                            - sig_start );
     int ret = ssl->conf->f_async_resume( ssl,
                                          sig_start, signature_len, sig_max_len );
@@ -2893,7 +2918,7 @@
         ret = mbedtls_ecjpake_write_round_two(
             &ssl->handshake->ecjpake_ctx,
             ssl->out_msg + ssl->out_msglen,
-            MBEDTLS_SSL_MAX_CONTENT_LEN - ssl->out_msglen, &len,
+            MBEDTLS_SSL_OUT_CONTENT_LEN - ssl->out_msglen, &len,
             ssl->conf->f_rng, ssl->conf->p_rng );
         if( ret != 0 )
         {
@@ -3020,7 +3045,7 @@
         if( ( ret = mbedtls_ecdh_make_params(
                   &ssl->handshake->ecdh_ctx, &len,
                   ssl->out_msg + ssl->out_msglen,
-                  MBEDTLS_SSL_MAX_CONTENT_LEN - ssl->out_msglen,
+                  MBEDTLS_SSL_OUT_CONTENT_LEN - ssl->out_msglen,
                   ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
         {
             MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_params", ret );
@@ -3437,6 +3462,10 @@
     defined(MBEDTLS_SSL_PROTO_TLS1_2)
     if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 )
     {
+        if ( p + 2 > end ) {
+            MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
+            return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
+        }
         if( *p++ != ( ( len >> 8 ) & 0xFF ) ||
             *p++ != ( ( len      ) & 0xFF ) )
         {
@@ -4171,7 +4200,7 @@
     if( ( ret = ssl->conf->f_ticket_write( ssl->conf->p_ticket,
                                 ssl->session_negotiate,
                                 ssl->out_msg + 10,
-                                ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN,
+                                ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN,
                                 &tlen, &lifetime ) ) != 0 )
     {
         MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_ticket_write", ret );
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index e5119fc..1c35f0d 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -141,14 +141,24 @@
  *    } MaxFragmentLength;
  * and we add 0 -> extension unused
  */
-static unsigned int mfl_code_to_length[MBEDTLS_SSL_MAX_FRAG_LEN_INVALID] =
+static unsigned int ssl_mfl_code_to_length( int mfl )
 {
-    MBEDTLS_SSL_MAX_CONTENT_LEN,    /* MBEDTLS_SSL_MAX_FRAG_LEN_NONE */
-    512,                    /* MBEDTLS_SSL_MAX_FRAG_LEN_512  */
-    1024,                   /* MBEDTLS_SSL_MAX_FRAG_LEN_1024 */
-    2048,                   /* MBEDTLS_SSL_MAX_FRAG_LEN_2048 */
-    4096,                   /* MBEDTLS_SSL_MAX_FRAG_LEN_4096 */
-};
+    switch( mfl )
+    {
+    case MBEDTLS_SSL_MAX_FRAG_LEN_NONE:
+        return ( MBEDTLS_TLS_EXT_ADV_CONTENT_LEN );
+    case MBEDTLS_SSL_MAX_FRAG_LEN_512:
+        return 512;
+    case MBEDTLS_SSL_MAX_FRAG_LEN_1024:
+        return 1024;
+    case MBEDTLS_SSL_MAX_FRAG_LEN_2048:
+        return 2048;
+    case MBEDTLS_SSL_MAX_FRAG_LEN_4096:
+        return 4096;
+    default:
+        return ( MBEDTLS_TLS_EXT_ADV_CONTENT_LEN );
+    }
+}
 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
 
 #if defined(MBEDTLS_SSL_CLI_C)
@@ -688,18 +698,32 @@
     transform->keylen = cipher_info->key_bitlen / 8;
 
     if( cipher_info->mode == MBEDTLS_MODE_GCM ||
-        cipher_info->mode == MBEDTLS_MODE_CCM )
+        cipher_info->mode == MBEDTLS_MODE_CCM ||
+        cipher_info->mode == MBEDTLS_MODE_CHACHAPOLY )
     {
+        size_t taglen, explicit_ivlen;
+
         transform->maclen = 0;
         mac_key_len = 0;
 
+        /* All modes haves 96-bit IVs;
+         * GCM and CCM has 4 implicit and 8 explicit bytes
+         * ChachaPoly has all 12 bytes implicit
+         */
         transform->ivlen = 12;
-        transform->fixed_ivlen = 4;
+        if( cipher_info->mode == MBEDTLS_MODE_CHACHAPOLY )
+            transform->fixed_ivlen = 12;
+        else
+            transform->fixed_ivlen = 4;
 
-        /* Minimum length is expicit IV + tag */
-        transform->minlen = transform->ivlen - transform->fixed_ivlen
-                            + ( transform->ciphersuite_info->flags &
-                                MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16 );
+        /* All modes have 128-bit tags, except CCM_8 (ciphersuite flag) */
+        taglen = transform->ciphersuite_info->flags &
+                  MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
+
+
+        /* Minimum length of encrypted record */
+        explicit_ivlen = transform->ivlen - transform->fixed_ivlen;
+        transform->minlen = explicit_ivlen + taglen;
     }
     else
     {
@@ -956,11 +980,11 @@
         if( ssl->compress_buf == NULL )
         {
             MBEDTLS_SSL_DEBUG_MSG( 3, ( "Allocating compression buffer" ) );
-            ssl->compress_buf = mbedtls_calloc( 1, MBEDTLS_SSL_BUFFER_LEN );
+            ssl->compress_buf = mbedtls_calloc( 1, MBEDTLS_SSL_COMPRESS_BUFFER_LEN );
             if( ssl->compress_buf == NULL )
             {
                 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed",
-                                    MBEDTLS_SSL_BUFFER_LEN ) );
+                                    MBEDTLS_SSL_COMPRESS_BUFFER_LEN ) );
                 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
             }
         }
@@ -1151,6 +1175,9 @@
          * other_secret already set by the ClientKeyExchange message,
          * and is 48 bytes long
          */
+        if( end - p < 2 )
+            return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
         *p++ = 0;
         *p++ = 48;
         p += 48;
@@ -1297,11 +1324,11 @@
     MBEDTLS_SSL_DEBUG_BUF( 4, "before encrypt: output payload",
                       ssl->out_msg, ssl->out_msglen );
 
-    if( ssl->out_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN )
+    if( ssl->out_msglen > MBEDTLS_SSL_OUT_CONTENT_LEN )
     {
         MBEDTLS_SSL_DEBUG_MSG( 1, ( "Record content %u too large, maximum %d",
                                     (unsigned) ssl->out_msglen,
-                                    MBEDTLS_SSL_MAX_CONTENT_LEN ) );
+                                    MBEDTLS_SSL_OUT_CONTENT_LEN ) );
         return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
     }
 
@@ -1394,17 +1421,26 @@
     }
     else
 #endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */
-#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C)
+#if defined(MBEDTLS_GCM_C) || \
+    defined(MBEDTLS_CCM_C) || \
+    defined(MBEDTLS_CHACHAPOLY_C)
     if( mode == MBEDTLS_MODE_GCM ||
-        mode == MBEDTLS_MODE_CCM )
+        mode == MBEDTLS_MODE_CCM ||
+        mode == MBEDTLS_MODE_CHACHAPOLY )
     {
         int ret;
         size_t enc_msglen, olen;
         unsigned char *enc_msg;
         unsigned char add_data[13];
-        unsigned char taglen = ssl->transform_out->ciphersuite_info->flags &
+        unsigned char iv[12];
+        mbedtls_ssl_transform *transform = ssl->transform_out;
+        unsigned char taglen = transform->ciphersuite_info->flags &
                                MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
+        size_t explicit_ivlen = transform->ivlen - transform->fixed_ivlen;
 
+        /*
+         * Prepare additional authenticated data
+         */
         memcpy( add_data, ssl->out_ctr, 8 );
         add_data[8]  = ssl->out_msgtype;
         mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
@@ -1412,44 +1448,57 @@
         add_data[11] = ( ssl->out_msglen >> 8 ) & 0xFF;
         add_data[12] = ssl->out_msglen & 0xFF;
 
-        MBEDTLS_SSL_DEBUG_BUF( 4, "additional data used for AEAD",
-                       add_data, 13 );
+        MBEDTLS_SSL_DEBUG_BUF( 4, "additional data for AEAD", add_data, 13 );
 
         /*
          * Generate IV
          */
-        if( ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen != 8 )
+        if( transform->ivlen == 12 && transform->fixed_ivlen == 4 )
+        {
+            /* GCM and CCM: fixed || explicit (=seqnum) */
+            memcpy( iv, transform->iv_enc, transform->fixed_ivlen );
+            memcpy( iv + transform->fixed_ivlen, ssl->out_ctr, 8 );
+            memcpy( ssl->out_iv, ssl->out_ctr, 8 );
+
+        }
+        else if( transform->ivlen == 12 && transform->fixed_ivlen == 12 )
+        {
+            /* ChachaPoly: fixed XOR sequence number */
+            unsigned char i;
+
+            memcpy( iv, transform->iv_enc, transform->fixed_ivlen );
+
+            for( i = 0; i < 8; i++ )
+                iv[i+4] ^= ssl->out_ctr[i];
+        }
+        else
         {
             /* Reminder if we ever add an AEAD mode with a different size */
             MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
             return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
         }
 
-        memcpy( ssl->transform_out->iv_enc + ssl->transform_out->fixed_ivlen,
-                             ssl->out_ctr, 8 );
-        memcpy( ssl->out_iv, ssl->out_ctr, 8 );
-
-        MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", ssl->out_iv,
-                ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen );
+        MBEDTLS_SSL_DEBUG_BUF( 4, "IV used (internal)",
+                                  iv, transform->ivlen );
+        MBEDTLS_SSL_DEBUG_BUF( 4, "IV used (transmitted)",
+                                  ssl->out_iv, explicit_ivlen );
 
         /*
-         * Fix pointer positions and message length with added IV
+         * Fix message length with added IV
          */
         enc_msg = ssl->out_msg;
         enc_msglen = ssl->out_msglen;
-        ssl->out_msglen += ssl->transform_out->ivlen -
-                           ssl->transform_out->fixed_ivlen;
+        ssl->out_msglen += explicit_ivlen;
 
         MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
-                            "including %d bytes of padding",
-                       ssl->out_msglen, 0 ) );
+                                    "including 0 bytes of padding",
+                                    ssl->out_msglen ) );
 
         /*
          * Encrypt and authenticate
          */
-        if( ( ret = mbedtls_cipher_auth_encrypt( &ssl->transform_out->cipher_ctx_enc,
-                                         ssl->transform_out->iv_enc,
-                                         ssl->transform_out->ivlen,
+        if( ( ret = mbedtls_cipher_auth_encrypt( &transform->cipher_ctx_enc,
+                                         iv, transform->ivlen,
                                          add_data, 13,
                                          enc_msg, enc_msglen,
                                          enc_msg, &olen,
@@ -1609,7 +1658,6 @@
 
 static int ssl_decrypt_buf( mbedtls_ssl_context *ssl )
 {
-    size_t i;
     mbedtls_cipher_mode_t mode;
     int auth_done = 0;
 #if defined(SSL_SOME_MODES_USE_MAC)
@@ -1659,20 +1707,27 @@
     }
     else
 #endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */
-#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C)
+#if defined(MBEDTLS_GCM_C) || \
+    defined(MBEDTLS_CCM_C) || \
+    defined(MBEDTLS_CHACHAPOLY_C)
     if( mode == MBEDTLS_MODE_GCM ||
-        mode == MBEDTLS_MODE_CCM )
+        mode == MBEDTLS_MODE_CCM ||
+        mode == MBEDTLS_MODE_CHACHAPOLY )
     {
         int ret;
         size_t dec_msglen, olen;
         unsigned char *dec_msg;
         unsigned char *dec_msg_result;
         unsigned char add_data[13];
-        unsigned char taglen = ssl->transform_in->ciphersuite_info->flags &
+        unsigned char iv[12];
+        mbedtls_ssl_transform *transform = ssl->transform_in;
+        unsigned char taglen = transform->ciphersuite_info->flags &
                                MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
-        size_t explicit_iv_len = ssl->transform_in->ivlen -
-                                 ssl->transform_in->fixed_ivlen;
+        size_t explicit_iv_len = transform->ivlen - transform->fixed_ivlen;
 
+        /*
+         * Compute and update sizes
+         */
         if( ssl->in_msglen < explicit_iv_len + taglen )
         {
             MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < explicit_iv_len (%d) "
@@ -1686,6 +1741,9 @@
         dec_msg_result = ssl->in_msg;
         ssl->in_msglen = dec_msglen;
 
+        /*
+         * Prepare additional authenticated data
+         */
         memcpy( add_data, ssl->in_ctr, 8 );
         add_data[8]  = ssl->in_msgtype;
         mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
@@ -1693,23 +1751,43 @@
         add_data[11] = ( ssl->in_msglen >> 8 ) & 0xFF;
         add_data[12] = ssl->in_msglen & 0xFF;
 
-        MBEDTLS_SSL_DEBUG_BUF( 4, "additional data used for AEAD",
-                       add_data, 13 );
+        MBEDTLS_SSL_DEBUG_BUF( 4, "additional data for AEAD", add_data, 13 );
 
-        memcpy( ssl->transform_in->iv_dec + ssl->transform_in->fixed_ivlen,
-                ssl->in_iv,
-                ssl->transform_in->ivlen - ssl->transform_in->fixed_ivlen );
+        /*
+         * Prepare IV
+         */
+        if( transform->ivlen == 12 && transform->fixed_ivlen == 4 )
+        {
+            /* GCM and CCM: fixed || explicit (transmitted) */
+            memcpy( iv, transform->iv_dec, transform->fixed_ivlen );
+            memcpy( iv + transform->fixed_ivlen, ssl->in_iv, 8 );
 
-        MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", ssl->transform_in->iv_dec,
-                                     ssl->transform_in->ivlen );
+        }
+        else if( transform->ivlen == 12 && transform->fixed_ivlen == 12 )
+        {
+            /* ChachaPoly: fixed XOR sequence number */
+            unsigned char i;
+
+            memcpy( iv, transform->iv_dec, transform->fixed_ivlen );
+
+            for( i = 0; i < 8; i++ )
+                iv[i+4] ^= ssl->in_ctr[i];
+        }
+        else
+        {
+            /* Reminder if we ever add an AEAD mode with a different size */
+            MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+            return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+        }
+
+        MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", iv, transform->ivlen );
         MBEDTLS_SSL_DEBUG_BUF( 4, "TAG used", dec_msg + dec_msglen, taglen );
 
         /*
          * Decrypt and authenticate
          */
         if( ( ret = mbedtls_cipher_auth_decrypt( &ssl->transform_in->cipher_ctx_dec,
-                                         ssl->transform_in->iv_dec,
-                                         ssl->transform_in->ivlen,
+                                         iv, transform->ivlen,
                                          add_data, 13,
                                          dec_msg, dec_msglen,
                                          dec_msg_result, &olen,
@@ -1827,6 +1905,7 @@
          */
         if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
         {
+            unsigned char i;
             dec_msglen -= ssl->transform_in->ivlen;
             ssl->in_msglen -= ssl->transform_in->ivlen;
 
@@ -1901,19 +1980,20 @@
              */
             size_t pad_count = 0, real_count = 1;
             size_t padding_idx = ssl->in_msglen - padlen - 1;
+            size_t i;
 
             /*
              * Padding is guaranteed to be incorrect if:
              *   1. padlen >= ssl->in_msglen
              *
-             *   2. padding_idx >= MBEDTLS_SSL_MAX_CONTENT_LEN +
+             *   2. padding_idx >= MBEDTLS_SSL_IN_CONTENT_LEN +
              *                     ssl->transform_in->maclen
              *
              * In both cases we reset padding_idx to a safe value (0) to
              * prevent out-of-buffer reads.
              */
             correct &= ( ssl->in_msglen >= padlen + 1 );
-            correct &= ( padding_idx < MBEDTLS_SSL_MAX_CONTENT_LEN +
+            correct &= ( padding_idx < MBEDTLS_SSL_IN_CONTENT_LEN +
                                        ssl->transform_in->maclen );
 
             padding_idx *= correct;
@@ -2077,6 +2157,7 @@
     else
 #endif
     {
+        unsigned char i;
         for( i = 8; i > ssl_ep_len( ssl ); i-- )
             if( ++ssl->in_ctr[i - 1] != 0 )
                 break;
@@ -2126,7 +2207,7 @@
     ssl->transform_out->ctx_deflate.next_in = msg_pre;
     ssl->transform_out->ctx_deflate.avail_in = len_pre;
     ssl->transform_out->ctx_deflate.next_out = msg_post;
-    ssl->transform_out->ctx_deflate.avail_out = MBEDTLS_SSL_BUFFER_LEN - bytes_written;
+    ssl->transform_out->ctx_deflate.avail_out = MBEDTLS_SSL_OUT_BUFFER_LEN - bytes_written;
 
     ret = deflate( &ssl->transform_out->ctx_deflate, Z_SYNC_FLUSH );
     if( ret != Z_OK )
@@ -2135,7 +2216,7 @@
         return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
     }
 
-    ssl->out_msglen = MBEDTLS_SSL_BUFFER_LEN -
+    ssl->out_msglen = MBEDTLS_SSL_OUT_BUFFER_LEN -
                       ssl->transform_out->ctx_deflate.avail_out - bytes_written;
 
     MBEDTLS_SSL_DEBUG_MSG( 3, ( "after compression: msglen = %d, ",
@@ -2173,7 +2254,7 @@
     ssl->transform_in->ctx_inflate.next_in = msg_pre;
     ssl->transform_in->ctx_inflate.avail_in = len_pre;
     ssl->transform_in->ctx_inflate.next_out = msg_post;
-    ssl->transform_in->ctx_inflate.avail_out = MBEDTLS_SSL_BUFFER_LEN -
+    ssl->transform_in->ctx_inflate.avail_out = MBEDTLS_SSL_IN_BUFFER_LEN -
                                                header_bytes;
 
     ret = inflate( &ssl->transform_in->ctx_inflate, Z_SYNC_FLUSH );
@@ -2183,7 +2264,7 @@
         return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
     }
 
-    ssl->in_msglen = MBEDTLS_SSL_BUFFER_LEN -
+    ssl->in_msglen = MBEDTLS_SSL_IN_BUFFER_LEN -
                      ssl->transform_in->ctx_inflate.avail_out - header_bytes;
 
     MBEDTLS_SSL_DEBUG_MSG( 3, ( "after decompression: msglen = %d, ",
@@ -2258,7 +2339,7 @@
         return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
     }
 
-    if( nb_want > MBEDTLS_SSL_BUFFER_LEN - (size_t)( ssl->in_hdr - ssl->in_buf ) )
+    if( nb_want > MBEDTLS_SSL_IN_BUFFER_LEN - (size_t)( ssl->in_hdr - ssl->in_buf ) )
     {
         MBEDTLS_SSL_DEBUG_MSG( 1, ( "requesting more data than fits" ) );
         return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
@@ -2344,7 +2425,7 @@
         }
         else
         {
-            len = MBEDTLS_SSL_BUFFER_LEN - ( ssl->in_hdr - ssl->in_buf );
+            len = MBEDTLS_SSL_IN_BUFFER_LEN - ( ssl->in_hdr - ssl->in_buf );
 
             if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
                 timeout = ssl->handshake->retransmit_timeout;
@@ -2798,12 +2879,12 @@
         if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
         {
             /* Make room for the additional DTLS fields */
-            if( MBEDTLS_SSL_MAX_CONTENT_LEN - ssl->out_msglen < 8 )
+            if( MBEDTLS_SSL_OUT_CONTENT_LEN - ssl->out_msglen < 8 )
             {
                 MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS handshake message too large: "
                               "size %u, maximum %u",
                                (unsigned) ( ssl->in_hslen - 4 ),
-                               (unsigned) ( MBEDTLS_SSL_MAX_CONTENT_LEN - 12 ) ) );
+                               (unsigned) ( MBEDTLS_SSL_OUT_CONTENT_LEN - 12 ) ) );
                 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
             }
 
@@ -3016,7 +3097,7 @@
         MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialize reassembly, total length = %d",
                             msg_len ) );
 
-        if( ssl->in_hslen > MBEDTLS_SSL_MAX_CONTENT_LEN )
+        if( ssl->in_hslen > MBEDTLS_SSL_IN_CONTENT_LEN )
         {
             MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake message too large" ) );
             return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
@@ -3120,7 +3201,7 @@
         ssl->next_record_offset = new_remain - ssl->in_hdr;
         ssl->in_left = ssl->next_record_offset + remain_len;
 
-        if( ssl->in_left > MBEDTLS_SSL_BUFFER_LEN -
+        if( ssl->in_left > MBEDTLS_SSL_IN_BUFFER_LEN -
                            (size_t)( ssl->in_hdr - ssl->in_buf ) )
         {
             MBEDTLS_SSL_DEBUG_MSG( 1, ( "reassembled message too large for buffer" ) );
@@ -3496,7 +3577,7 @@
             ssl->conf->p_cookie,
             ssl->cli_id, ssl->cli_id_len,
             ssl->in_buf, ssl->in_left,
-            ssl->out_buf, MBEDTLS_SSL_MAX_CONTENT_LEN, &len );
+            ssl->out_buf, MBEDTLS_SSL_OUT_CONTENT_LEN, &len );
 
     MBEDTLS_SSL_DEBUG_RET( 2, "ssl_check_dtls_clihlo_cookie", ret );
 
@@ -3593,7 +3674,7 @@
     }
 
     /* Check length against the size of our buffer */
-    if( ssl->in_msglen > MBEDTLS_SSL_BUFFER_LEN
+    if( ssl->in_msglen > MBEDTLS_SSL_IN_BUFFER_LEN
                          - (size_t)( ssl->in_msg - ssl->in_buf ) )
     {
         MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
@@ -3687,7 +3768,7 @@
     if( ssl->transform_in == NULL )
     {
         if( ssl->in_msglen < 1 ||
-            ssl->in_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN )
+            ssl->in_msglen > MBEDTLS_SSL_IN_CONTENT_LEN )
         {
             MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
             return( MBEDTLS_ERR_SSL_INVALID_RECORD );
@@ -3703,7 +3784,7 @@
 
 #if defined(MBEDTLS_SSL_PROTO_SSL3)
         if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 &&
-            ssl->in_msglen > ssl->transform_in->minlen + MBEDTLS_SSL_MAX_CONTENT_LEN )
+            ssl->in_msglen > ssl->transform_in->minlen + MBEDTLS_SSL_IN_CONTENT_LEN )
         {
             MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
             return( MBEDTLS_ERR_SSL_INVALID_RECORD );
@@ -3716,7 +3797,7 @@
          */
         if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 &&
             ssl->in_msglen > ssl->transform_in->minlen +
-                             MBEDTLS_SSL_MAX_CONTENT_LEN + 256 )
+                             MBEDTLS_SSL_IN_CONTENT_LEN + 256 )
         {
             MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
             return( MBEDTLS_ERR_SSL_INVALID_RECORD );
@@ -3764,7 +3845,7 @@
         MBEDTLS_SSL_DEBUG_BUF( 4, "input payload after decrypt",
                        ssl->in_msg, ssl->in_msglen );
 
-        if( ssl->in_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN )
+        if( ssl->in_msglen > MBEDTLS_SSL_IN_CONTENT_LEN )
         {
             MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
             return( MBEDTLS_ERR_SSL_INVALID_RECORD );
@@ -4325,10 +4406,10 @@
     while( crt != NULL )
     {
         n = crt->raw.len;
-        if( n > MBEDTLS_SSL_MAX_CONTENT_LEN - 3 - i )
+        if( n > MBEDTLS_SSL_OUT_CONTENT_LEN - 3 - i )
         {
             MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate too large, %d > %d",
-                           i + 3 + n, MBEDTLS_SSL_MAX_CONTENT_LEN ) );
+                           i + 3 + n, MBEDTLS_SSL_OUT_CONTENT_LEN ) );
             return( MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE );
         }
 
@@ -4528,6 +4609,12 @@
 
     while( i < ssl->in_hslen )
     {
+        if ( i + 3 > ssl->in_hslen ) {
+            MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
+            mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+                                           MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
+            return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
+        }
         if( ssl->in_msg[i] != 0 )
         {
             MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
@@ -5662,17 +5749,23 @@
                        const mbedtls_ssl_config *conf )
 {
     int ret;
-    const size_t len = MBEDTLS_SSL_BUFFER_LEN;
 
     ssl->conf = conf;
 
     /*
      * Prepare base structures
      */
-    if( ( ssl-> in_buf = mbedtls_calloc( 1, len ) ) == NULL ||
-        ( ssl->out_buf = mbedtls_calloc( 1, len ) ) == NULL )
+    ssl->in_buf = mbedtls_calloc( 1, MBEDTLS_SSL_IN_BUFFER_LEN );
+    if( ssl->in_buf == NULL )
     {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", len ) );
+        MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", MBEDTLS_SSL_IN_BUFFER_LEN) );
+        return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+    }
+
+    ssl->out_buf = mbedtls_calloc( 1, MBEDTLS_SSL_OUT_BUFFER_LEN );
+    if( ssl->out_buf == NULL )
+    {
+        MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", MBEDTLS_SSL_OUT_BUFFER_LEN) );
         mbedtls_free( ssl->in_buf );
         ssl->in_buf = NULL;
         return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
@@ -5773,9 +5866,9 @@
     ssl->transform_in = NULL;
     ssl->transform_out = NULL;
 
-    memset( ssl->out_buf, 0, MBEDTLS_SSL_BUFFER_LEN );
+    memset( ssl->out_buf, 0, MBEDTLS_SSL_OUT_BUFFER_LEN );
     if( partial == 0 )
-        memset( ssl->in_buf, 0, MBEDTLS_SSL_BUFFER_LEN );
+        memset( ssl->in_buf, 0, MBEDTLS_SSL_IN_BUFFER_LEN );
 
 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
     if( mbedtls_ssl_hw_record_reset != NULL )
@@ -5995,27 +6088,27 @@
                                 mbedtls_x509_crt *cert,
                                 mbedtls_pk_context *key )
 {
-    mbedtls_ssl_key_cert *new;
+    mbedtls_ssl_key_cert *new_cert;
 
-    new = mbedtls_calloc( 1, sizeof( mbedtls_ssl_key_cert ) );
-    if( new == NULL )
+    new_cert = mbedtls_calloc( 1, sizeof( mbedtls_ssl_key_cert ) );
+    if( new_cert == NULL )
         return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
 
-    new->cert = cert;
-    new->key  = key;
-    new->next = NULL;
+    new_cert->cert = cert;
+    new_cert->key  = key;
+    new_cert->next = NULL;
 
     /* Update head is the list was null, else add to the end */
     if( *head == NULL )
     {
-        *head = new;
+        *head = new_cert;
     }
     else
     {
         mbedtls_ssl_key_cert *cur = *head;
         while( cur->next != NULL )
             cur = cur->next;
-        cur->next = new;
+        cur->next = new_cert;
     }
 
     return( 0 );
@@ -6100,7 +6193,7 @@
 
     /* Identity len will be encoded on two bytes */
     if( ( psk_identity_len >> 16 ) != 0 ||
-        psk_identity_len > MBEDTLS_SSL_MAX_CONTENT_LEN )
+        psk_identity_len > MBEDTLS_SSL_OUT_CONTENT_LEN )
     {
         return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
     }
@@ -6401,7 +6494,7 @@
 int mbedtls_ssl_conf_max_frag_len( mbedtls_ssl_config *conf, unsigned char mfl_code )
 {
     if( mfl_code >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID ||
-        mfl_code_to_length[mfl_code] > MBEDTLS_SSL_MAX_CONTENT_LEN )
+        ssl_mfl_code_to_length( mfl_code ) > MBEDTLS_TLS_EXT_ADV_CONTENT_LEN )
     {
         return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
     }
@@ -6679,15 +6772,15 @@
     /*
      * Assume mfl_code is correct since it was checked when set
      */
-    max_len = mfl_code_to_length[ssl->conf->mfl_code];
+    max_len = ssl_mfl_code_to_length( ssl->conf->mfl_code );
 
     /*
      * Check if a smaller max length was negotiated
      */
     if( ssl->session_out != NULL &&
-        mfl_code_to_length[ssl->session_out->mfl_code] < max_len )
+        ssl_mfl_code_to_length( ssl->session_out->mfl_code ) < max_len )
     {
-        max_len = mfl_code_to_length[ssl->session_out->mfl_code];
+        max_len = ssl_mfl_code_to_length( ssl->session_out->mfl_code );
     }
 
     return max_len;
@@ -7231,8 +7324,16 @@
 }
 
 /*
- * Send application data to be encrypted by the SSL layer,
- * taking care of max fragment length and buffer size
+ * Send application data to be encrypted by the SSL layer, taking care of max
+ * fragment length and buffer size.
+ *
+ * According to RFC 5246 Section 6.2.1:
+ *
+ *      Zero-length fragments of Application data MAY be sent as they are
+ *      potentially useful as a traffic analysis countermeasure.
+ *
+ * Therefore, it is possible that the input message length is 0 and the
+ * corresponding return code is 0 on success.
  */
 static int ssl_write_real( mbedtls_ssl_context *ssl,
                            const unsigned char *buf, size_t len )
@@ -7241,7 +7342,7 @@
 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
     size_t max_len = mbedtls_ssl_get_max_frag_len( ssl );
 #else
-    size_t max_len = MBEDTLS_SSL_MAX_CONTENT_LEN;
+    size_t max_len = MBEDTLS_SSL_OUT_CONTENT_LEN;
 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
     if( len > max_len )
     {
@@ -7260,6 +7361,12 @@
 
     if( ssl->out_left != 0 )
     {
+        /*
+         * The user has previously tried to send the data and
+         * MBEDTLS_ERR_SSL_WANT_WRITE or the message was only partially
+         * written. In this case, we expect the high-level write function
+         * (e.g. mbedtls_ssl_write()) to be called with the same parameters
+         */
         if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
         {
             MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret );
@@ -7268,6 +7375,11 @@
     }
     else
     {
+        /*
+         * The user is trying to send a message the first time, so we need to
+         * copy the data into the internal buffers and setup the data structure
+         * to keep track of partial writes
+         */
         ssl->out_msglen  = len;
         ssl->out_msgtype = MBEDTLS_SSL_MSG_APPLICATION_DATA;
         memcpy( ssl->out_msg, buf, len );
@@ -7543,20 +7655,20 @@
 
     if( ssl->out_buf != NULL )
     {
-        mbedtls_platform_zeroize( ssl->out_buf, MBEDTLS_SSL_BUFFER_LEN );
+        mbedtls_platform_zeroize( ssl->out_buf, MBEDTLS_SSL_OUT_BUFFER_LEN );
         mbedtls_free( ssl->out_buf );
     }
 
     if( ssl->in_buf != NULL )
     {
-        mbedtls_platform_zeroize( ssl->in_buf, MBEDTLS_SSL_BUFFER_LEN );
+        mbedtls_platform_zeroize( ssl->in_buf, MBEDTLS_SSL_IN_BUFFER_LEN );
         mbedtls_free( ssl->in_buf );
     }
 
 #if defined(MBEDTLS_ZLIB_SUPPORT)
     if( ssl->compress_buf != NULL )
     {
-        mbedtls_platform_zeroize( ssl->compress_buf, MBEDTLS_SSL_BUFFER_LEN );
+        mbedtls_platform_zeroize( ssl->compress_buf, MBEDTLS_SSL_COMPRESS_BUFFER_LEN );
         mbedtls_free( ssl->compress_buf );
     }
 #endif
diff --git a/library/timing.c b/library/timing.c
index 6a30e51..3e8139f 100644
--- a/library/timing.c
+++ b/library/timing.c
@@ -39,7 +39,8 @@
 #if !defined(MBEDTLS_TIMING_ALT)
 
 #if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
-    !defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__)
+    !defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__) && \
+    !defined(__HAIKU__)
 #error "This module only works on Unix and Windows, see MBEDTLS_TIMING_C in config.h"
 #endif
 
diff --git a/library/x509.c b/library/x509.c
index 371d6da..264c7fb 100644
--- a/library/x509.c
+++ b/library/x509.c
@@ -70,15 +70,6 @@
 #include <time.h>
 #endif
 
-#if defined(MBEDTLS_FS_IO)
-#include <stdio.h>
-#if !defined(_WIN32)
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <dirent.h>
-#endif
-#endif
-
 #define CHECK(code) if( ( ret = code ) != 0 ){ return( ret ); }
 #define CHECK_RANGE(min, max, val) if( val < min || val > max ){ return( ret ); }
 
diff --git a/library/x509_csr.c b/library/x509_csr.c
index 3e8e8fb..f844257 100644
--- a/library/x509_csr.c
+++ b/library/x509_csr.c
@@ -274,34 +274,25 @@
         return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
 
 #if defined(MBEDTLS_PEM_PARSE_C)
-    mbedtls_pem_init( &pem );
-
     /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
-    if( buf[buflen - 1] != '\0' )
-        ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
-    else
+    if( buf[buflen - 1] == '\0' )
+    {
+        mbedtls_pem_init( &pem );
         ret = mbedtls_pem_read_buffer( &pem,
                                "-----BEGIN CERTIFICATE REQUEST-----",
                                "-----END CERTIFICATE REQUEST-----",
                                buf, NULL, 0, &use_len );
 
-    if( ret == 0 )
-    {
-        /*
-         * Was PEM encoded, parse the result
-         */
-        if( ( ret = mbedtls_x509_csr_parse_der( csr, pem.buf, pem.buflen ) ) != 0 )
-            return( ret );
+        if( ret == 0 )
+            /*
+             * Was PEM encoded, parse the result
+             */
+            ret = mbedtls_x509_csr_parse_der( csr, pem.buf, pem.buflen );
 
         mbedtls_pem_free( &pem );
-        return( 0 );
+        if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
+            return( ret );
     }
-    else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
-    {
-        mbedtls_pem_free( &pem );
-        return( ret );
-    }
-    else
 #endif /* MBEDTLS_PEM_PARSE_C */
     return( mbedtls_x509_csr_parse_der( csr, buf, buflen ) );
 }
diff --git a/programs/aes/aescrypt2.c b/programs/aes/aescrypt2.c
index 4acf38d..c727f93 100644
--- a/programs/aes/aescrypt2.c
+++ b/programs/aes/aescrypt2.c
@@ -29,9 +29,12 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_fprintf    fprintf
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_fprintf         fprintf
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #include "mbedtls/aes.h"
 #include "mbedtls/md.h"
@@ -71,7 +74,8 @@
 #else
 int main( int argc, char *argv[] )
 {
-    int ret = 1;
+    int ret = 0;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
 
     unsigned int i, n;
     int mode, lastn;
@@ -429,7 +433,7 @@
         }
     }
 
-    ret = 0;
+    exit_code = MBEDTLS_EXIT_SUCCESS;
 
 exit:
     if( fin )
@@ -452,6 +456,6 @@
     mbedtls_aes_free( &aes_ctx );
     mbedtls_md_free( &sha_ctx );
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_AES_C && MBEDTLS_SHA256_C && MBEDTLS_FS_IO */
diff --git a/programs/aes/crypt_and_hash.c b/programs/aes/crypt_and_hash.c
index 0e272eb..99d30c9 100644
--- a/programs/aes/crypt_and_hash.c
+++ b/programs/aes/crypt_and_hash.c
@@ -30,9 +30,12 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_fprintf    fprintf
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_fprintf         fprintf
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_CIPHER_C) && defined(MBEDTLS_MD_C) && \
  defined(MBEDTLS_FS_IO)
@@ -74,6 +77,7 @@
 int main( int argc, char *argv[] )
 {
     int ret = 1, i, n;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     int mode;
     size_t keylen, ilen, olen;
     FILE *fkey, *fin = NULL, *fout = NULL;
@@ -526,7 +530,7 @@
         }
     }
 
-    ret = 0;
+    exit_code = MBEDTLS_EXIT_SUCCESS;
 
 exit:
     if( fin )
@@ -549,6 +553,6 @@
     mbedtls_cipher_free( &cipher_ctx );
     mbedtls_md_free( &md_ctx );
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_CIPHER_C && MBEDTLS_MD_C && MBEDTLS_FS_IO */
diff --git a/programs/hash/generic_sum.c b/programs/hash/generic_sum.c
index d1e81d4..bbe8d92 100644
--- a/programs/hash/generic_sum.c
+++ b/programs/hash/generic_sum.c
@@ -29,9 +29,12 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_fprintf    fprintf
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_fprintf         fprintf
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_MD_C) && defined(MBEDTLS_FS_IO)
 #include "mbedtls/md.h"
@@ -169,7 +172,8 @@
 
 int main( int argc, char *argv[] )
 {
-    int ret, i;
+    int ret = 1, i;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     const mbedtls_md_info_t *md_info;
     mbedtls_md_context_t md_ctx;
 
@@ -196,7 +200,7 @@
         fflush( stdout ); getchar();
 #endif
 
-        return( 1 );
+        return( exit_code );
     }
 
     /*
@@ -206,12 +210,12 @@
     if( md_info == NULL )
     {
         mbedtls_fprintf( stderr, "Message Digest '%s' not found\n", argv[1] );
-        return( 1 );
+        return( exit_code );
     }
     if( mbedtls_md_setup( &md_ctx, md_info, 0 ) )
     {
         mbedtls_fprintf( stderr, "Failed to initialize context.\n" );
-        return( 1 );
+        return( exit_code );
     }
 
     ret = 0;
@@ -224,9 +228,12 @@
     for( i = 2; i < argc; i++ )
         ret |= generic_print( md_info, argv[i] );
 
+    if ( ret == 0 )
+        exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
     mbedtls_md_free( &md_ctx );
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_MD_C && MBEDTLS_FS_IO */
diff --git a/programs/pkey/dh_client.c b/programs/pkey/dh_client.c
index 0978408..3dadf48 100644
--- a/programs/pkey/dh_client.c
+++ b/programs/pkey/dh_client.c
@@ -29,9 +29,12 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_printf     printf
-#define mbedtls_time_t     time_t
-#endif
+#include <stdlib.h>
+#define mbedtls_printf          printf
+#define mbedtls_time_t          time_t
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_AES_C) && defined(MBEDTLS_DHM_C) && \
     defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_NET_C) && \
@@ -71,7 +74,8 @@
 {
     FILE *f;
 
-    int ret;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     size_t n, buflen;
     mbedtls_net_context server_fd;
 
@@ -115,7 +119,6 @@
 
     if( ( f = fopen( "rsa_pub.txt", "rb" ) ) == NULL )
     {
-        ret = 1;
         mbedtls_printf( " failed\n  ! Could not open rsa_pub.txt\n" \
                 "  ! Please run rsa_genkey first\n\n" );
         goto exit;
@@ -191,7 +194,6 @@
 
     if( dhm.len < 64 || dhm.len > 512 )
     {
-        ret = 1;
         mbedtls_printf( " failed\n  ! Invalid DHM modulus size\n\n" );
         goto exit;
     }
@@ -207,7 +209,6 @@
 
     if( ( n = (size_t) ( end - p ) ) != rsa.len )
     {
-        ret = 1;
         mbedtls_printf( " failed\n  ! Invalid RSA signature size\n\n" );
         goto exit;
     }
@@ -286,6 +287,8 @@
     buf[16] = '\0';
     mbedtls_printf( "\n  . Plaintext is \"%s\"\n\n", (char *) buf );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
 
     mbedtls_net_free( &server_fd );
@@ -301,7 +304,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_AES_C && MBEDTLS_DHM_C && MBEDTLS_ENTROPY_C &&
           MBEDTLS_NET_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
diff --git a/programs/pkey/dh_genprime.c b/programs/pkey/dh_genprime.c
index 84a94a1..dbe9153 100644
--- a/programs/pkey/dh_genprime.c
+++ b/programs/pkey/dh_genprime.c
@@ -30,9 +30,11 @@
 #else
 #include <stdio.h>
 #include <stdlib.h>
-#define mbedtls_printf     printf
-#define mbedtls_time_t     time_t
-#endif
+#define mbedtls_printf          printf
+#define mbedtls_time_t          time_t
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) ||   \
     !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_CTR_DRBG_C) ||     \
@@ -69,6 +71,7 @@
 int main( int argc, char **argv )
 {
     int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_mpi G, P, Q;
     mbedtls_entropy_context entropy;
     mbedtls_ctr_drbg_context ctr_drbg;
@@ -86,7 +89,7 @@
     {
     usage:
         mbedtls_printf( USAGE );
-        return( 1 );
+        return( exit_code );
     }
 
     for( i = 1; i < argc; i++ )
@@ -164,7 +167,6 @@
 
     if( ( fout = fopen( "dh_prime.txt", "wb+" ) ) == NULL )
     {
-        ret = 1;
         mbedtls_printf( " failed\n  ! Could not create dh_prime.txt\n\n" );
         goto exit;
     }
@@ -180,6 +182,8 @@
     mbedtls_printf( " ok\n\n" );
     fclose( fout );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
 
     mbedtls_mpi_free( &G ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
@@ -191,7 +195,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_FS_IO &&
           MBEDTLS_CTR_DRBG_C && MBEDTLS_GENPRIME */
diff --git a/programs/pkey/dh_server.c b/programs/pkey/dh_server.c
index 4304231..c4e2c39 100644
--- a/programs/pkey/dh_server.c
+++ b/programs/pkey/dh_server.c
@@ -29,9 +29,12 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_printf     printf
-#define mbedtls_time_t     time_t
-#endif
+#include <stdlib.h>
+#define mbedtls_printf          printf
+#define mbedtls_time_t          time_t
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_AES_C) && defined(MBEDTLS_DHM_C) && \
     defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_NET_C) && \
@@ -71,7 +74,8 @@
 {
     FILE *f;
 
-    int ret;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     size_t n, buflen;
     mbedtls_net_context listen_fd, client_fd;
 
@@ -121,7 +125,6 @@
 
     if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
     {
-        ret = 1;
         mbedtls_printf( " failed\n  ! Could not open rsa_priv.txt\n" \
                 "  ! Please run rsa_genkey first\n\n" );
         goto exit;
@@ -164,7 +167,6 @@
 
     if( ( f = fopen( "dh_prime.txt", "rb" ) ) == NULL )
     {
-        ret = 1;
         mbedtls_printf( " failed\n  ! Could not open dh_prime.txt\n" \
                 "  ! Please run dh_genprime first\n\n" );
         goto exit;
@@ -304,6 +306,8 @@
 
     mbedtls_printf( "\n\n" );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
 
     mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
@@ -323,7 +327,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_AES_C && MBEDTLS_DHM_C && MBEDTLS_ENTROPY_C &&
           MBEDTLS_NET_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
diff --git a/programs/pkey/ecdh_curve25519.c b/programs/pkey/ecdh_curve25519.c
index e7ead9a..5db0408 100644
--- a/programs/pkey/ecdh_curve25519.c
+++ b/programs/pkey/ecdh_curve25519.c
@@ -29,8 +29,11 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if !defined(MBEDTLS_ECDH_C) || \
     !defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED) || \
@@ -51,7 +54,8 @@
 
 int main( int argc, char *argv[] )
 {
-    int ret;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_ecdh_context ctx_cli, ctx_srv;
     mbedtls_entropy_context entropy;
     mbedtls_ctr_drbg_context ctr_drbg;
@@ -218,6 +222,7 @@
 
     mbedtls_printf( " ok\n" );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
 
 exit:
 
@@ -231,7 +236,7 @@
     mbedtls_ctr_drbg_free( &ctr_drbg );
     mbedtls_entropy_free( &entropy );
 
-    return( ret != 0 );
+    return( exit_code );
 }
 #endif /* MBEDTLS_ECDH_C && MBEDTLS_ECP_DP_CURVE25519_ENABLED &&
           MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */
diff --git a/programs/pkey/ecdsa.c b/programs/pkey/ecdsa.c
index b474060..c653df9 100644
--- a/programs/pkey/ecdsa.c
+++ b/programs/pkey/ecdsa.c
@@ -29,8 +29,11 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_ECDSA_C) && \
     defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_CTR_DRBG_C)
@@ -98,7 +101,8 @@
 
 int main( int argc, char *argv[] )
 {
-    int ret;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_ecdsa_context ctx_sign, ctx_verify;
     mbedtls_entropy_context entropy;
     mbedtls_ctr_drbg_context ctr_drbg;
@@ -115,7 +119,6 @@
 
     memset( sig, 0, sizeof( sig ) );
     memset( message, 0x25, sizeof( message ) );
-    ret = 1;
 
     if( argc != 1 )
     {
@@ -213,8 +216,6 @@
         goto exit;
     }
 
-    ret = 0;
-
     /*
      * Verify signature
      */
@@ -231,6 +232,8 @@
 
     mbedtls_printf( " ok\n" );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
 
 #if defined(_WIN32)
@@ -243,7 +246,7 @@
     mbedtls_ctr_drbg_free( &ctr_drbg );
     mbedtls_entropy_free( &entropy );
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C &&
           ECPARAMS */
diff --git a/programs/pkey/gen_key.c b/programs/pkey/gen_key.c
index a7f5c90..f01bf5f 100644
--- a/programs/pkey/gen_key.c
+++ b/programs/pkey/gen_key.c
@@ -29,8 +29,11 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_PK_WRITE_C) && defined(MBEDTLS_FS_IO) && \
     defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_CTR_DRBG_C)
@@ -186,7 +189,8 @@
 
 int main( int argc, char *argv[] )
 {
-    int ret = 0;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_pk_context key;
     char buf[1024];
     int i;
@@ -214,7 +218,6 @@
     if( argc == 0 )
     {
     usage:
-        ret = 1;
         mbedtls_printf( USAGE );
 #if defined(MBEDTLS_ECP_C)
         mbedtls_printf( " available ec_curve values:\n" );
@@ -222,7 +225,7 @@
         mbedtls_printf( "    %s (default)\n", curve_info->name );
         while( ( ++curve_info )->name != NULL )
             mbedtls_printf( "    %s\n", curve_info->name );
-#endif
+#endif /* MBEDTLS_ECP_C */
         goto exit;
     }
 
@@ -411,9 +414,11 @@
 
     mbedtls_printf( " ok\n" );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
 
-    if( ret != 0 && ret != 1)
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
     {
 #ifdef MBEDTLS_ERROR_C
         mbedtls_strerror( ret, buf, sizeof( buf ) );
@@ -436,7 +441,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_PK_WRITE_C && MBEDTLS_PEM_WRITE_C && MBEDTLS_FS_IO &&
         * MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */
diff --git a/programs/pkey/key_app.c b/programs/pkey/key_app.c
index f1b548d..7a4cb39 100644
--- a/programs/pkey/key_app.c
+++ b/programs/pkey/key_app.c
@@ -29,8 +29,11 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_BIGNUM_C) && \
     defined(MBEDTLS_PK_PARSE_C) && defined(MBEDTLS_FS_IO)
@@ -83,7 +86,8 @@
 
 int main( int argc, char *argv[] )
 {
-    int ret = 0;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     char buf[1024];
     int i;
     char *p, *q;
@@ -283,10 +287,12 @@
     else
         goto usage;
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
 
 #if defined(MBEDTLS_ERROR_C)
-    if( ret != 0 )
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
     {
         mbedtls_strerror( ret, buf, sizeof(buf) );
         mbedtls_printf( "  !  Last error was: %s\n", buf );
@@ -303,6 +309,6 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO */
diff --git a/programs/pkey/key_app_writer.c b/programs/pkey/key_app_writer.c
index 52b0f8e..13602c2 100644
--- a/programs/pkey/key_app_writer.c
+++ b/programs/pkey/key_app_writer.c
@@ -29,8 +29,11 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_PK_WRITE_C) && defined(MBEDTLS_FS_IO)
 #include "mbedtls/error.h"
@@ -128,7 +131,7 @@
             return( ret );
 
         len = ret;
-        c = output_buf + sizeof(output_buf) - len - 1;
+        c = output_buf + sizeof(output_buf) - len;
     }
 
     if( ( f = fopen( output_file, "w" ) ) == NULL )
@@ -189,7 +192,8 @@
 
 int main( int argc, char *argv[] )
 {
-    int ret = 0;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     char buf[1024];
     int i;
     char *p, *q;
@@ -210,7 +214,6 @@
     if( argc == 0 )
     {
     usage:
-        ret = 1;
         mbedtls_printf( USAGE );
         goto exit;
     }
@@ -403,9 +406,11 @@
         write_private_key( &key, opt.output_file );
     }
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
 
-    if( ret != 0 && ret != 1)
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
     {
 #ifdef MBEDTLS_ERROR_C
         mbedtls_strerror( ret, buf, sizeof( buf ) );
@@ -426,6 +431,6 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_PK_WRITE_C && MBEDTLS_FS_IO */
diff --git a/programs/pkey/mpi_demo.c b/programs/pkey/mpi_demo.c
index afe8957..365bdc4 100644
--- a/programs/pkey/mpi_demo.c
+++ b/programs/pkey/mpi_demo.c
@@ -29,8 +29,11 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_FS_IO)
 #include "mbedtls/bignum.h"
@@ -47,7 +50,8 @@
 #else
 int main( void )
 {
-    int ret;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_mpi E, P, Q, N, H, D, X, Y, Z;
 
     mbedtls_mpi_init( &E ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q ); mbedtls_mpi_init( &N );
@@ -88,15 +92,16 @@
     MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "  Z (decrypted)  = Y^D mod N = ", &Z, 10, NULL ) );
     mbedtls_printf( "\n" );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 cleanup:
     mbedtls_mpi_free( &E ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q ); mbedtls_mpi_free( &N );
     mbedtls_mpi_free( &H ); mbedtls_mpi_free( &D ); mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y );
     mbedtls_mpi_free( &Z );
 
-    if( ret != 0 )
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
     {
         mbedtls_printf( "\nAn error occurred.\n" );
-        ret = 1;
     }
 
 #if defined(_WIN32)
@@ -104,6 +109,6 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_FS_IO */
diff --git a/programs/pkey/pk_decrypt.c b/programs/pkey/pk_decrypt.c
index 32fbc75..00bd71e 100644
--- a/programs/pkey/pk_decrypt.c
+++ b/programs/pkey/pk_decrypt.c
@@ -29,8 +29,11 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_PK_PARSE_C) && \
     defined(MBEDTLS_FS_IO) && defined(MBEDTLS_ENTROPY_C) && \
@@ -59,7 +62,8 @@
 int main( int argc, char *argv[] )
 {
     FILE *f;
-    int ret, c;
+    int ret = 1, c;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     size_t i, olen = 0;
     mbedtls_pk_context pk;
     mbedtls_entropy_context entropy;
@@ -71,7 +75,6 @@
 
     mbedtls_ctr_drbg_init( &ctr_drbg );
     memset(result, 0, sizeof( result ) );
-    ret = 1;
 
     if( argc != 2 )
     {
@@ -110,8 +113,6 @@
     /*
      * Extract the RSA encrypted value from the text file
      */
-    ret = 1;
-
     if( ( f = fopen( "result-enc.txt", "rb" ) ) == NULL )
     {
         mbedtls_printf( "\n  ! Could not open %s\n\n", "result-enc.txt" );
@@ -143,14 +144,14 @@
 
     mbedtls_printf( "The decrypted result is: '%s'\n\n", result );
 
-    ret = 0;
+    exit_code = MBEDTLS_EXIT_SUCCESS;
 
 exit:
     mbedtls_ctr_drbg_free( &ctr_drbg );
     mbedtls_entropy_free( &entropy );
 
 #if defined(MBEDTLS_ERROR_C)
-    if( ret != 0 )
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
     {
         mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
         mbedtls_printf( "  !  Last error was: %s\n", buf );
@@ -162,7 +163,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
           MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */
diff --git a/programs/pkey/pk_encrypt.c b/programs/pkey/pk_encrypt.c
index 7ca9d5a..400619c 100644
--- a/programs/pkey/pk_encrypt.c
+++ b/programs/pkey/pk_encrypt.c
@@ -29,9 +29,12 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_fprintf    fprintf
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_fprintf         fprintf
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_PK_PARSE_C) && \
     defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO) && \
@@ -59,7 +62,8 @@
 int main( int argc, char *argv[] )
 {
     FILE *f;
-    int ret;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     size_t i, olen = 0;
     mbedtls_pk_context pk;
     mbedtls_entropy_context entropy;
@@ -68,7 +72,6 @@
     unsigned char buf[512];
     const char *pers = "mbedtls_pk_encrypt";
 
-    ret = 1;
     mbedtls_ctr_drbg_init( &ctr_drbg );
 
     if( argc != 3 )
@@ -132,7 +135,6 @@
      */
     if( ( f = fopen( "result-enc.txt", "wb+" ) ) == NULL )
     {
-        ret = 1;
         mbedtls_printf( " failed\n  ! Could not create %s\n\n", "result-enc.txt" );
         goto exit;
     }
@@ -145,12 +147,14 @@
 
     mbedtls_printf( "\n  . Done (created \"%s\")\n\n", "result-enc.txt" );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
     mbedtls_ctr_drbg_free( &ctr_drbg );
     mbedtls_entropy_free( &entropy );
 
 #if defined(MBEDTLS_ERROR_C)
-    if( ret != 0 )
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
     {
         mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
         mbedtls_printf( "  !  Last error was: %s\n", buf );
@@ -162,7 +166,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_PK_PARSE_C && MBEDTLS_ENTROPY_C &&
           MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
diff --git a/programs/pkey/pk_sign.c b/programs/pkey/pk_sign.c
index 55df95e..7ec4675 100644
--- a/programs/pkey/pk_sign.c
+++ b/programs/pkey/pk_sign.c
@@ -30,9 +30,11 @@
 #else
 #include <stdio.h>
 #include <stdlib.h>
-#define mbedtls_snprintf   snprintf
-#define mbedtls_printf     printf
-#endif
+#define mbedtls_snprintf        snprintf
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) ||  \
     !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \
@@ -61,6 +63,7 @@
 {
     FILE *f;
     int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_pk_context pk;
     mbedtls_entropy_context entropy;
     mbedtls_ctr_drbg_context ctr_drbg;
@@ -134,14 +137,12 @@
 
     if( ( f = fopen( filename, "wb+" ) ) == NULL )
     {
-        ret = 1;
         mbedtls_printf( " failed\n  ! Could not create %s\n\n", filename );
         goto exit;
     }
 
     if( fwrite( buf, 1, olen, f ) != olen )
     {
-        ret = 1;
         mbedtls_printf( "failed\n  ! fwrite failed\n\n" );
         fclose( f );
         goto exit;
@@ -151,13 +152,15 @@
 
     mbedtls_printf( "\n  . Done (created \"%s\")\n\n", filename );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
     mbedtls_pk_free( &pk );
     mbedtls_ctr_drbg_free( &ctr_drbg );
     mbedtls_entropy_free( &entropy );
 
 #if defined(MBEDTLS_ERROR_C)
-    if( ret != 0 )
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
     {
         mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
         mbedtls_printf( "  !  Last error was: %s\n", buf );
@@ -169,7 +172,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret ? EXIT_FAILURE : EXIT_SUCCESS );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C &&
           MBEDTLS_SHA256_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
diff --git a/programs/pkey/pk_verify.c b/programs/pkey/pk_verify.c
index d35d17f..3c7709f 100644
--- a/programs/pkey/pk_verify.c
+++ b/programs/pkey/pk_verify.c
@@ -29,9 +29,12 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_snprintf   snprintf
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_snprintf        snprintf
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_MD_C) || \
     !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_PK_PARSE_C) ||   \
@@ -56,6 +59,7 @@
 {
     FILE *f;
     int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     size_t i;
     mbedtls_pk_context pk;
     unsigned char hash[32];
@@ -87,7 +91,6 @@
     /*
      * Extract the signature from the file
      */
-    ret = 1;
     mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[2] );
 
     if( ( f = fopen( filename, "rb" ) ) == NULL )
@@ -125,13 +128,13 @@
 
     mbedtls_printf( "\n  . OK (the signature is valid)\n\n" );
 
-    ret = 0;
+    exit_code = MBEDTLS_EXIT_SUCCESS;
 
 exit:
     mbedtls_pk_free( &pk );
 
 #if defined(MBEDTLS_ERROR_C)
-    if( ret != 0 )
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
     {
         mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
         mbedtls_printf( "  !  Last error was: %s\n", buf );
@@ -143,7 +146,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_SHA256_C &&
           MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO */
diff --git a/programs/pkey/rsa_decrypt.c b/programs/pkey/rsa_decrypt.c
index 2da3fbf..0a252d2 100644
--- a/programs/pkey/rsa_decrypt.c
+++ b/programs/pkey/rsa_decrypt.c
@@ -30,11 +30,11 @@
 #else
 #include <stdio.h>
 #include <stdlib.h>
-#define mbedtls_printf     printf
-#define mbedtls_exit       exit
+#define mbedtls_printf       printf
+#define mbedtls_exit         exit
 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
-#endif
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_RSA_C) && \
     defined(MBEDTLS_FS_IO) && defined(MBEDTLS_ENTROPY_C) && \
@@ -61,7 +61,9 @@
 int main( int argc, char *argv[] )
 {
     FILE *f;
-    int return_val, exit_val, c;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    int c;
     size_t i;
     mbedtls_rsa_context rsa;
     mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
@@ -73,7 +75,6 @@
     ((void) argv);
 
     memset(result, 0, sizeof( result ) );
-    exit_val = MBEDTLS_EXIT_SUCCESS;
 
     if( argc != 1 )
     {
@@ -83,7 +84,7 @@
         mbedtls_printf( "\n" );
 #endif
 
-        mbedtls_exit( MBEDTLS_EXIT_FAILURE );
+        mbedtls_exit( exit_code );
     }
 
     mbedtls_printf( "\n  . Seeding the random number generator..." );
@@ -96,14 +97,13 @@
     mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E ); mbedtls_mpi_init( &DP );
     mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
 
-    return_val = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func,
+    ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func,
                                         &entropy, (const unsigned char *) pers,
                                         strlen( pers ) );
-    if( return_val != 0 )
+    if( ret != 0 )
     {
-        exit_val = MBEDTLS_EXIT_FAILURE;
         mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_seed returned %d\n",
-                        return_val );
+                        ret );
         goto exit;
     }
 
@@ -112,40 +112,38 @@
 
     if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
     {
-        exit_val = MBEDTLS_EXIT_FAILURE;
         mbedtls_printf( " failed\n  ! Could not open rsa_priv.txt\n" \
                 "  ! Please run rsa_genkey first\n\n" );
         goto exit;
     }
 
-    if( ( return_val = mbedtls_mpi_read_file( &N , 16, f ) )  != 0 ||
-        ( return_val = mbedtls_mpi_read_file( &E , 16, f ) )  != 0 ||
-        ( return_val = mbedtls_mpi_read_file( &D , 16, f ) )  != 0 ||
-        ( return_val = mbedtls_mpi_read_file( &P , 16, f ) )  != 0 ||
-        ( return_val = mbedtls_mpi_read_file( &Q , 16, f ) )  != 0 ||
-        ( return_val = mbedtls_mpi_read_file( &DP , 16, f ) ) != 0 ||
-        ( return_val = mbedtls_mpi_read_file( &DQ , 16, f ) ) != 0 ||
-        ( return_val = mbedtls_mpi_read_file( &QP , 16, f ) ) != 0 )
+    if( ( ret = mbedtls_mpi_read_file( &N , 16, f ) )  != 0 ||
+        ( ret = mbedtls_mpi_read_file( &E , 16, f ) )  != 0 ||
+        ( ret = mbedtls_mpi_read_file( &D , 16, f ) )  != 0 ||
+        ( ret = mbedtls_mpi_read_file( &P , 16, f ) )  != 0 ||
+        ( ret = mbedtls_mpi_read_file( &Q , 16, f ) )  != 0 ||
+        ( ret = mbedtls_mpi_read_file( &DP , 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &DQ , 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &QP , 16, f ) ) != 0 )
     {
-        exit_val = MBEDTLS_EXIT_FAILURE;
         mbedtls_printf( " failed\n  ! mbedtls_mpi_read_file returned %d\n\n",
-                        return_val );
+                        ret );
         fclose( f );
         goto exit;
     }
     fclose( f );
 
-    if( ( return_val = mbedtls_rsa_import( &rsa, &N, &P, &Q, &D, &E ) ) != 0 )
+    if( ( ret = mbedtls_rsa_import( &rsa, &N, &P, &Q, &D, &E ) ) != 0 )
     {
         mbedtls_printf( " failed\n  ! mbedtls_rsa_import returned %d\n\n",
-                        return_val );
+                        ret );
         goto exit;
     }
 
-    if( ( return_val = mbedtls_rsa_complete( &rsa ) ) != 0 )
+    if( ( ret = mbedtls_rsa_complete( &rsa ) ) != 0 )
     {
         mbedtls_printf( " failed\n  ! mbedtls_rsa_complete returned %d\n\n",
-                        return_val );
+                        ret );
         goto exit;
     }
 
@@ -154,7 +152,6 @@
      */
     if( ( f = fopen( "result-enc.txt", "rb" ) ) == NULL )
     {
-        exit_val = MBEDTLS_EXIT_FAILURE;
         mbedtls_printf( "\n  ! Could not open %s\n\n", "result-enc.txt" );
         goto exit;
     }
@@ -169,7 +166,6 @@
 
     if( i != rsa.len )
     {
-        exit_val = MBEDTLS_EXIT_FAILURE;
         mbedtls_printf( "\n  ! Invalid RSA signature format\n\n" );
         goto exit;
     }
@@ -180,14 +176,13 @@
     mbedtls_printf( "\n  . Decrypting the encrypted data" );
     fflush( stdout );
 
-    return_val = mbedtls_rsa_pkcs1_decrypt( &rsa, mbedtls_ctr_drbg_random,
+    ret = mbedtls_rsa_pkcs1_decrypt( &rsa, mbedtls_ctr_drbg_random,
                                             &ctr_drbg, MBEDTLS_RSA_PRIVATE, &i,
                                             buf, result, 1024 );
-    if( return_val != 0 )
+    if( ret != 0 )
     {
-        exit_val = MBEDTLS_EXIT_FAILURE;
         mbedtls_printf( " failed\n  ! mbedtls_rsa_pkcs1_decrypt returned %d\n\n",
-                        return_val );
+                        ret );
         goto exit;
     }
 
@@ -195,6 +190,8 @@
 
     mbedtls_printf( "The decrypted result is: '%s'\n\n", result );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
     mbedtls_ctr_drbg_free( &ctr_drbg );
     mbedtls_entropy_free( &entropy );
@@ -208,6 +205,6 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( exit_val );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_FS_IO */
diff --git a/programs/pkey/rsa_encrypt.c b/programs/pkey/rsa_encrypt.c
index 81c27d8..411657a 100644
--- a/programs/pkey/rsa_encrypt.c
+++ b/programs/pkey/rsa_encrypt.c
@@ -30,12 +30,12 @@
 #else
 #include <stdio.h>
 #include <stdlib.h>
-#define mbedtls_fprintf    fprintf
-#define mbedtls_printf     printf
-#define mbedtls_exit       exit
-#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
-#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
-#endif
+#define mbedtls_fprintf         fprintf
+#define mbedtls_printf          printf
+#define mbedtls_exit            exit
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_RSA_C) && \
     defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO) && \
@@ -61,7 +61,8 @@
 int main( int argc, char *argv[] )
 {
     FILE *f;
-    int return_val, exit_val;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     size_t i;
     mbedtls_rsa_context rsa;
     mbedtls_entropy_context entropy;
@@ -71,8 +72,6 @@
     const char *pers = "rsa_encrypt";
     mbedtls_mpi N, E;
 
-    exit_val = MBEDTLS_EXIT_SUCCESS;
-
     if( argc != 2 )
     {
         mbedtls_printf( "usage: rsa_encrypt <string of max 100 characters>\n" );
@@ -81,7 +80,7 @@
         mbedtls_printf( "\n" );
 #endif
 
-        mbedtls_exit( MBEDTLS_EXIT_FAILURE );
+        mbedtls_exit( exit_code );
     }
 
     mbedtls_printf( "\n  . Seeding the random number generator..." );
@@ -92,14 +91,13 @@
     mbedtls_ctr_drbg_init( &ctr_drbg );
     mbedtls_entropy_init( &entropy );
 
-    return_val = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func,
-                                        &entropy, (const unsigned char *) pers,
-                                        strlen( pers ) );
-    if( return_val != 0 )
+    ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func,
+                                 &entropy, (const unsigned char *) pers,
+                                 strlen( pers ) );
+    if( ret != 0 )
     {
-        exit_val = MBEDTLS_EXIT_FAILURE;
         mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_seed returned %d\n",
-                        return_val );
+                        ret );
         goto exit;
     }
 
@@ -108,35 +106,30 @@
 
     if( ( f = fopen( "rsa_pub.txt", "rb" ) ) == NULL )
     {
-        exit_val = MBEDTLS_EXIT_FAILURE;
         mbedtls_printf( " failed\n  ! Could not open rsa_pub.txt\n" \
                 "  ! Please run rsa_genkey first\n\n" );
         goto exit;
     }
 
-    if( ( return_val = mbedtls_mpi_read_file( &N, 16, f ) ) != 0 ||
-        ( return_val = mbedtls_mpi_read_file( &E, 16, f ) ) != 0 )
+    if( ( ret = mbedtls_mpi_read_file( &N, 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &E, 16, f ) ) != 0 )
     {
-        exit_val = MBEDTLS_EXIT_FAILURE;
         mbedtls_printf( " failed\n  ! mbedtls_mpi_read_file returned %d\n\n",
-                        return_val );
+                        ret );
         fclose( f );
         goto exit;
     }
     fclose( f );
 
-    if( ( return_val = mbedtls_rsa_import( &rsa, &N, NULL,
-                                           NULL, NULL, &E ) ) != 0 )
+    if( ( ret = mbedtls_rsa_import( &rsa, &N, NULL, NULL, NULL, &E ) ) != 0 )
     {
-        exit_val = MBEDTLS_EXIT_FAILURE;
         mbedtls_printf( " failed\n  ! mbedtls_rsa_import returned %d\n\n",
-                        return_val );
+                        ret );
         goto exit;
     }
 
     if( strlen( argv[1] ) > 100 )
     {
-        exit_val = MBEDTLS_EXIT_FAILURE;
         mbedtls_printf( " Input data larger than 100 characters.\n\n" );
         goto exit;
     }
@@ -149,14 +142,13 @@
     mbedtls_printf( "\n  . Generating the RSA encrypted value" );
     fflush( stdout );
 
-    return_val = mbedtls_rsa_pkcs1_encrypt( &rsa, mbedtls_ctr_drbg_random,
-                                            &ctr_drbg, MBEDTLS_RSA_PUBLIC,
-                                            strlen( argv[1] ), input, buf );
-    if( return_val != 0 )
+    ret = mbedtls_rsa_pkcs1_encrypt( &rsa, mbedtls_ctr_drbg_random,
+                                     &ctr_drbg, MBEDTLS_RSA_PUBLIC,
+                                     strlen( argv[1] ), input, buf );
+    if( ret != 0 )
     {
-        exit_val = MBEDTLS_EXIT_FAILURE;
         mbedtls_printf( " failed\n  ! mbedtls_rsa_pkcs1_encrypt returned %d\n\n",
-                        return_val );
+                        ret );
         goto exit;
     }
 
@@ -165,7 +157,6 @@
      */
     if( ( f = fopen( "result-enc.txt", "wb+" ) ) == NULL )
     {
-        exit_val = MBEDTLS_EXIT_FAILURE;
         mbedtls_printf( " failed\n  ! Could not create %s\n\n", "result-enc.txt" );
         goto exit;
     }
@@ -178,6 +169,8 @@
 
     mbedtls_printf( "\n  . Done (created \"%s\")\n\n", "result-enc.txt" );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
     mbedtls_mpi_free( &N ); mbedtls_mpi_free( &E );
     mbedtls_ctr_drbg_free( &ctr_drbg );
@@ -189,7 +182,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( exit_val );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_ENTROPY_C &&
           MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
diff --git a/programs/pkey/rsa_genkey.c b/programs/pkey/rsa_genkey.c
index 9399217..3359e14 100644
--- a/programs/pkey/rsa_genkey.c
+++ b/programs/pkey/rsa_genkey.c
@@ -29,8 +29,11 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_ENTROPY_C) && \
     defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME) && \
@@ -61,7 +64,8 @@
 #else
 int main( void )
 {
-    int ret;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_rsa_context rsa;
     mbedtls_entropy_context entropy;
     mbedtls_ctr_drbg_context ctr_drbg;
@@ -105,14 +109,12 @@
         ( ret = mbedtls_rsa_export_crt( &rsa, &DP, &DQ, &QP ) )      != 0 )
     {
         mbedtls_printf( " failed\n  ! could not export RSA parameters\n\n" );
-        ret = 1;
         goto exit;
     }
 
     if( ( fpub = fopen( "rsa_pub.txt", "wb+" ) ) == NULL )
     {
         mbedtls_printf( " failed\n  ! could not open rsa_pub.txt for writing\n\n" );
-        ret = 1;
         goto exit;
     }
 
@@ -129,7 +131,6 @@
     if( ( fpriv = fopen( "rsa_priv.txt", "wb+" ) ) == NULL )
     {
         mbedtls_printf( " failed\n  ! could not open rsa_priv.txt for writing\n" );
-        ret = 1;
         goto exit;
     }
 
@@ -160,6 +161,8 @@
 */
     mbedtls_printf( " ok\n\n" );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
 
     if( fpub  != NULL )
@@ -180,7 +183,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_RSA_C &&
           MBEDTLS_GENPRIME && MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
diff --git a/programs/pkey/rsa_sign.c b/programs/pkey/rsa_sign.c
index 89018cb..b16fe5d 100644
--- a/programs/pkey/rsa_sign.c
+++ b/programs/pkey/rsa_sign.c
@@ -29,10 +29,13 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_fprintf    fprintf
-#define mbedtls_printf     printf
-#define mbedtls_snprintf   snprintf
-#endif
+#include <stdlib.h>
+#define mbedtls_fprintf         fprintf
+#define mbedtls_printf          printf
+#define mbedtls_snprintf        snprintf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) ||  \
     !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \
@@ -55,7 +58,8 @@
 int main( int argc, char *argv[] )
 {
     FILE *f;
-    int ret;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     size_t i;
     mbedtls_rsa_context rsa;
     unsigned char hash[32];
@@ -69,8 +73,6 @@
     mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E ); mbedtls_mpi_init( &DP );
     mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
 
-    ret = 1;
-
     if( argc != 2 )
     {
         mbedtls_printf( "usage: rsa_sign <filename>\n" );
@@ -87,7 +89,6 @@
 
     if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
     {
-        ret = 1;
         mbedtls_printf( " failed\n  ! Could not open rsa_priv.txt\n" \
                 "  ! Please run rsa_genkey first\n\n" );
         goto exit;
@@ -159,7 +160,6 @@
 
     if( ( f = fopen( filename, "wb+" ) ) == NULL )
     {
-        ret = 1;
         mbedtls_printf( " failed\n  ! Could not create %s\n\n", argv[1] );
         goto exit;
     }
@@ -172,6 +172,8 @@
 
     mbedtls_printf( "\n  . Done (created \"%s\")\n\n", filename );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
 
     mbedtls_rsa_free( &rsa );
@@ -184,7 +186,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
           MBEDTLS_FS_IO */
diff --git a/programs/pkey/rsa_sign_pss.c b/programs/pkey/rsa_sign_pss.c
index 7b6f14d..b0b0f7e 100644
--- a/programs/pkey/rsa_sign_pss.c
+++ b/programs/pkey/rsa_sign_pss.c
@@ -29,9 +29,12 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_snprintf   snprintf
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_snprintf        snprintf
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if !defined(MBEDTLS_MD_C) || !defined(MBEDTLS_ENTROPY_C) ||  \
     !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_SHA256_C) ||        \
@@ -61,6 +64,7 @@
 {
     FILE *f;
     int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_pk_context pk;
     mbedtls_entropy_context entropy;
     mbedtls_ctr_drbg_context ctr_drbg;
@@ -101,7 +105,6 @@
 
     if( ( ret = mbedtls_pk_parse_keyfile( &pk, argv[1], "" ) ) != 0 )
     {
-        ret = 1;
         mbedtls_printf( " failed\n  ! Could not read key from '%s'\n", argv[1] );
         mbedtls_printf( "  ! mbedtls_pk_parse_public_keyfile returned %d\n\n", ret );
         goto exit;
@@ -109,7 +112,6 @@
 
     if( !mbedtls_pk_can_do( &pk, MBEDTLS_PK_RSA ) )
     {
-        ret = 1;
         mbedtls_printf( " failed\n  ! Key is not an RSA key\n" );
         goto exit;
     }
@@ -145,7 +147,6 @@
 
     if( ( f = fopen( filename, "wb+" ) ) == NULL )
     {
-        ret = 1;
         mbedtls_printf( " failed\n  ! Could not create %s\n\n", filename );
         goto exit;
     }
@@ -161,6 +162,8 @@
 
     mbedtls_printf( "\n  . Done (created \"%s\")\n\n", filename );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
     mbedtls_pk_free( &pk );
     mbedtls_ctr_drbg_free( &ctr_drbg );
@@ -171,7 +174,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_RSA_C &&
           MBEDTLS_SHA256_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
diff --git a/programs/pkey/rsa_verify.c b/programs/pkey/rsa_verify.c
index 1f827aa..6f88345 100644
--- a/programs/pkey/rsa_verify.c
+++ b/programs/pkey/rsa_verify.c
@@ -29,9 +29,12 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_printf     printf
-#define mbedtls_snprintf   snprintf
-#endif
+#include <stdlib.h>
+#define mbedtls_printf          printf
+#define mbedtls_snprintf        snprintf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) ||  \
     !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \
@@ -54,7 +57,8 @@
 int main( int argc, char *argv[] )
 {
     FILE *f;
-    int ret, c;
+    int ret = 1, c;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     size_t i;
     mbedtls_rsa_context rsa;
     unsigned char hash[32];
@@ -62,7 +66,6 @@
     char filename[512];
 
     mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
-    ret = 1;
 
     if( argc != 2 )
     {
@@ -100,7 +103,6 @@
     /*
      * Extract the RSA signature from the text file
      */
-    ret = 1;
     mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[1] );
 
     if( ( f = fopen( filename, "rb" ) ) == NULL )
@@ -146,7 +148,7 @@
 
     mbedtls_printf( "\n  . OK (the signature is valid)\n\n" );
 
-    ret = 0;
+    exit_code = MBEDTLS_EXIT_SUCCESS;
 
 exit:
 
@@ -157,7 +159,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
           MBEDTLS_FS_IO */
diff --git a/programs/pkey/rsa_verify_pss.c b/programs/pkey/rsa_verify_pss.c
index 31b720f..7c9c68f 100644
--- a/programs/pkey/rsa_verify_pss.c
+++ b/programs/pkey/rsa_verify_pss.c
@@ -29,9 +29,12 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_snprintf   snprintf
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_snprintf        snprintf
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if !defined(MBEDTLS_MD_C) || !defined(MBEDTLS_ENTROPY_C) ||  \
     !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_SHA256_C) ||        \
@@ -60,6 +63,7 @@
 {
     FILE *f;
     int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     size_t i;
     mbedtls_pk_context pk;
     unsigned char hash[32];
@@ -91,7 +95,6 @@
 
     if( !mbedtls_pk_can_do( &pk, MBEDTLS_PK_RSA ) )
     {
-        ret = 1;
         mbedtls_printf( " failed\n  ! Key is not an RSA key\n" );
         goto exit;
     }
@@ -101,7 +104,6 @@
     /*
      * Extract the RSA signature from the file
      */
-    ret = 1;
     mbedtls_snprintf( filename, 512, "%s.sig", argv[2] );
 
     if( ( f = fopen( filename, "rb" ) ) == NULL )
@@ -139,7 +141,7 @@
 
     mbedtls_printf( "\n  . OK (the signature is valid)\n\n" );
 
-    ret = 0;
+    exit_code = MBEDTLS_EXIT_SUCCESS;
 
 exit:
     mbedtls_pk_free( &pk );
@@ -149,7 +151,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
           MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO */
diff --git a/programs/random/gen_entropy.c b/programs/random/gen_entropy.c
index 792d381..a1eb386 100644
--- a/programs/random/gen_entropy.c
+++ b/programs/random/gen_entropy.c
@@ -29,9 +29,12 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_fprintf    fprintf
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_fprintf         fprintf
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO)
 #include "mbedtls/entropy.h"
@@ -49,20 +52,21 @@
 int main( int argc, char *argv[] )
 {
     FILE *f;
-    int i, k, ret;
+    int i, k, ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_entropy_context entropy;
     unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
 
     if( argc < 2 )
     {
         mbedtls_fprintf( stderr, "usage: %s <output filename>\n", argv[0] );
-        return( 1 );
+        return( exit_code );
     }
 
     if( ( f = fopen( argv[1], "wb+" ) ) == NULL )
     {
         mbedtls_printf( "failed to open '%s' for writing.\n", argv[1] );
-        return( 1 );
+        return( exit_code );
     }
 
     mbedtls_entropy_init( &entropy );
@@ -72,7 +76,8 @@
         ret = mbedtls_entropy_func( &entropy, buf, sizeof( buf ) );
         if( ret != 0 )
         {
-            mbedtls_printf("failed!\n");
+            mbedtls_printf( "  failed\n  !  mbedtls_entropy_func returned -%04X\n",
+                            ret );
             goto cleanup;
         }
 
@@ -83,7 +88,7 @@
         fflush( stdout );
     }
 
-    ret = 0;
+    exit_code = MBEDTLS_EXIT_SUCCESS;
 
 cleanup:
     mbedtls_printf( "\n" );
@@ -91,6 +96,6 @@
     fclose( f );
     mbedtls_entropy_free( &entropy );
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_ENTROPY_C */
diff --git a/programs/random/gen_random_ctr_drbg.c b/programs/random/gen_random_ctr_drbg.c
index c76f99d..5ade946 100644
--- a/programs/random/gen_random_ctr_drbg.c
+++ b/programs/random/gen_random_ctr_drbg.c
@@ -29,9 +29,12 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_fprintf    fprintf
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_fprintf         fprintf
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_CTR_DRBG_C) && defined(MBEDTLS_ENTROPY_C) && \
  defined(MBEDTLS_FS_IO)
@@ -52,7 +55,8 @@
 int main( int argc, char *argv[] )
 {
     FILE *f;
-    int i, k, ret;
+    int i, k, ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_ctr_drbg_context ctr_drbg;
     mbedtls_entropy_context entropy;
     unsigned char buf[1024];
@@ -62,13 +66,13 @@
     if( argc < 2 )
     {
         mbedtls_fprintf( stderr, "usage: %s <output filename>\n", argv[0] );
-        return( 1 );
+        return( exit_code );
     }
 
     if( ( f = fopen( argv[1], "wb+" ) ) == NULL )
     {
         mbedtls_printf( "failed to open '%s' for writing.\n", argv[1] );
-        return( 1 );
+        return( exit_code );
     }
 
     mbedtls_entropy_init( &entropy );
@@ -116,7 +120,7 @@
         fflush( stdout );
     }
 
-    ret = 0;
+    exit_code = MBEDTLS_EXIT_SUCCESS;
 
 cleanup:
     mbedtls_printf("\n");
@@ -125,6 +129,6 @@
     mbedtls_ctr_drbg_free( &ctr_drbg );
     mbedtls_entropy_free( &entropy );
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_CTR_DRBG_C && MBEDTLS_ENTROPY_C */
diff --git a/programs/random/gen_random_havege.c b/programs/random/gen_random_havege.c
index 6c31462..3fb3f01 100644
--- a/programs/random/gen_random_havege.c
+++ b/programs/random/gen_random_havege.c
@@ -29,9 +29,12 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_fprintf    fprintf
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_fprintf         fprintf
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_HAVEGE_C) && defined(MBEDTLS_FS_IO)
 #include "mbedtls/havege.h"
@@ -51,20 +54,21 @@
 {
     FILE *f;
     time_t t;
-    int i, k, ret = 0;
+    int i, k, ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_havege_state hs;
     unsigned char buf[1024];
 
     if( argc < 2 )
     {
         mbedtls_fprintf( stderr, "usage: %s <output filename>\n", argv[0] );
-        return( 1 );
+        return( exit_code );
     }
 
     if( ( f = fopen( argv[1], "wb+" ) ) == NULL )
     {
         mbedtls_printf( "failed to open '%s' for writing.\n", argv[1] );
-        return( 1 );
+        return( exit_code );
     }
 
     mbedtls_havege_init( &hs );
@@ -73,11 +77,10 @@
 
     for( i = 0, k = 768; i < k; i++ )
     {
-        if( mbedtls_havege_random( &hs, buf, sizeof( buf ) ) != 0 )
+        if( ( ret = mbedtls_havege_random( &hs, buf, sizeof( buf ) ) ) != 0 )
         {
-            mbedtls_printf( "Failed to get random from source.\n" );
-
-            ret = 1;
+            mbedtls_printf( " failed\n  !  mbedtls_havege_random returned -0x%04X",
+                            -ret );
             goto exit;
         }
 
@@ -93,9 +96,11 @@
 
     mbedtls_printf(" \n ");
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
     mbedtls_havege_free( &hs );
     fclose( f );
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_HAVEGE_C */
diff --git a/programs/ssl/ssl_client1.c b/programs/ssl/ssl_client1.c
index 01cee13..bf7c013 100644
--- a/programs/ssl/ssl_client1.c
+++ b/programs/ssl/ssl_client1.c
@@ -30,11 +30,13 @@
 #else
 #include <stdio.h>
 #include <stdlib.h>
-#define mbedtls_time       time
-#define mbedtls_time_t     time_t
-#define mbedtls_fprintf    fprintf
-#define mbedtls_printf     printf
-#endif
+#define mbedtls_time            time
+#define mbedtls_time_t          time_t
+#define mbedtls_fprintf         fprintf
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) ||  \
     !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
@@ -80,7 +82,8 @@
 
 int main( void )
 {
-    int ret, len;
+    int ret = 1, len;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_net_context server_fd;
     uint32_t flags;
     unsigned char buf[1024];
@@ -281,10 +284,12 @@
 
     mbedtls_ssl_close_notify( &ssl );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
 
 #ifdef MBEDTLS_ERROR_C
-    if( ret != 0 )
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
     {
         char error_buf[100];
         mbedtls_strerror( ret, error_buf, 100 );
@@ -305,7 +310,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
           MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C &&
diff --git a/programs/ssl/ssl_fork_server.c b/programs/ssl/ssl_fork_server.c
index 7624896..1c3a806 100644
--- a/programs/ssl/ssl_fork_server.c
+++ b/programs/ssl/ssl_fork_server.c
@@ -29,10 +29,13 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_fprintf    fprintf
-#define mbedtls_printf     printf
-#define mbedtls_time_t     time_t
-#endif
+#include <stdlib.h>
+#define mbedtls_fprintf         fprintf
+#define mbedtls_printf          printf
+#define mbedtls_time_t          time_t
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_CERTS_C) ||    \
     !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_SSL_TLS_C) || \
@@ -95,7 +98,8 @@
 
 int main( void )
 {
-    int ret, len, cnt = 0, pid;
+    int ret = 1, len, cnt = 0, pid;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_net_context listen_fd, client_fd;
     unsigned char buf[1024];
     const char *pers = "ssl_fork_server";
@@ -392,6 +396,8 @@
         goto exit;
     }
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
     mbedtls_net_free( &client_fd );
     mbedtls_net_free( &listen_fd );
@@ -408,7 +414,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_CERTS_C && MBEDTLS_ENTROPY_C &&
           MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
diff --git a/programs/ssl/ssl_mail_client.c b/programs/ssl/ssl_mail_client.c
index 04b847a..04f8910 100644
--- a/programs/ssl/ssl_mail_client.c
+++ b/programs/ssl/ssl_mail_client.c
@@ -30,11 +30,13 @@
 #else
 #include <stdio.h>
 #include <stdlib.h>
-#define mbedtls_time       time
-#define mbedtls_time_t     time_t
-#define mbedtls_fprintf    fprintf
-#define mbedtls_printf     printf
-#endif
+#define mbedtls_time            time
+#define mbedtls_time_t          time_t
+#define mbedtls_fprintf         fprintf
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) ||  \
     !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
@@ -346,7 +348,8 @@
 
 int main( int argc, char *argv[] )
 {
-    int ret = 0, len;
+    int ret = 1, len;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_net_context server_fd;
     unsigned char buf[1024];
 #if defined(MBEDTLS_BASE64_C)
@@ -499,8 +502,8 @@
                               mbedtls_test_cas_pem_len );
 #else
     {
-        ret = 1;
         mbedtls_printf("MBEDTLS_CERTS_C and/or MBEDTLS_PEM_PARSE_C not defined.");
+        goto exit;
     }
 #endif
     if( ret < 0 )
@@ -529,8 +532,8 @@
                               mbedtls_test_cli_crt_len );
 #else
     {
-        ret = -1;
         mbedtls_printf("MBEDTLS_CERTS_C not defined.");
+        goto exit;
     }
 #endif
     if( ret != 0 )
@@ -549,8 +552,8 @@
                 mbedtls_test_cli_key_len, NULL, 0 );
 #else
     {
-        ret = -1;
         mbedtls_printf("MBEDTLS_CERTS_C or MBEDTLS_PEM_PARSE_C not defined.");
+        goto exit;
     }
 #endif
     if( ret != 0 )
@@ -819,6 +822,8 @@
 
     mbedtls_ssl_close_notify( &ssl );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
 
     mbedtls_net_free( &server_fd );
@@ -835,7 +840,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
           MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C **
diff --git a/programs/test/ssl_cert_test.c b/programs/test/ssl_cert_test.c
index 9cfcd2d..fd3526f 100644
--- a/programs/test/ssl_cert_test.c
+++ b/programs/test/ssl_cert_test.c
@@ -29,9 +29,12 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_snprintf   snprintf
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_snprintf        snprintf
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_X509_CRT_PARSE_C) && \
     defined(MBEDTLS_FS_IO) && defined(MBEDTLS_X509_CRL_PARSE_C)
@@ -80,7 +83,8 @@
 
 int main( void )
 {
-    int ret, i;
+    int ret = 1, i;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_x509_crt cacert;
     mbedtls_x509_crl crl;
     char buf[10240];
@@ -210,7 +214,6 @@
         if( ! mbedtls_pk_can_do( &clicert.pk, MBEDTLS_PK_RSA ) )
         {
             mbedtls_printf( " failed\n  !  certificate's key is not RSA\n\n" );
-            ret = MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE;
             goto exit;
         }
 
@@ -241,6 +244,8 @@
         mbedtls_pk_free( &pk );
     }
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
     mbedtls_x509_crt_free( &cacert );
     mbedtls_x509_crl_free( &crl );
@@ -250,7 +255,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_RSA_C && MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_FS_IO &&
           MBEDTLS_X509_CRL_PARSE_C */
diff --git a/programs/test/udp_proxy.c b/programs/test/udp_proxy.c
index 5797f3d..55e0f24 100644
--- a/programs/test/udp_proxy.c
+++ b/programs/test/udp_proxy.c
@@ -37,10 +37,12 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <time.h>
-#define mbedtls_time       time
-#define mbedtls_time_t     time_t
-#define mbedtls_printf     printf
-#endif
+#define mbedtls_time            time
+#define mbedtls_time_t          time_t
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if !defined(MBEDTLS_NET_C)
 int main( void )
@@ -600,7 +602,8 @@
 
 int main( int argc, char *argv[] )
 {
-    int ret;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
 
     mbedtls_net_context listen_fd, client_fd, server_fd;
 
@@ -781,10 +784,12 @@
 
     }
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
 
 #ifdef MBEDTLS_ERROR_C
-    if( ret != 0 )
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
     {
         char error_buf[100];
         mbedtls_strerror( ret, error_buf, 100 );
@@ -802,7 +807,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret != 0 );
+    return( exit_code );
 }
 
 #endif /* MBEDTLS_NET_C */
diff --git a/programs/util/pem2der.c b/programs/util/pem2der.c
index ad2c6ac..73a9fb5 100644
--- a/programs/util/pem2der.c
+++ b/programs/util/pem2der.c
@@ -29,10 +29,13 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_free       free
-#define mbedtls_calloc    calloc
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_free            free
+#define mbedtls_calloc          calloc
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if defined(MBEDTLS_BASE64_C) && defined(MBEDTLS_FS_IO)
 #include "mbedtls/error.h"
@@ -178,7 +181,8 @@
 
 int main( int argc, char *argv[] )
 {
-    int ret = 0;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     unsigned char *pem_buffer = NULL;
     unsigned char der_buffer[4096];
     char buf[1024];
@@ -273,6 +277,8 @@
 
     mbedtls_printf( " ok\n" );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
     free( pem_buffer );
 
@@ -281,6 +287,6 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BASE64_C && MBEDTLS_FS_IO */
diff --git a/programs/x509/cert_app.c b/programs/x509/cert_app.c
index c893ca8..c57ecca 100644
--- a/programs/x509/cert_app.c
+++ b/programs/x509/cert_app.c
@@ -30,11 +30,13 @@
 #else
 #include <stdio.h>
 #include <stdlib.h>
-#define mbedtls_time       time
-#define mbedtls_time_t     time_t
-#define mbedtls_fprintf    fprintf
-#define mbedtls_printf     printf
-#endif
+#define mbedtls_time            time
+#define mbedtls_time_t          time_t
+#define mbedtls_fprintf         fprintf
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) ||  \
     !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
@@ -145,7 +147,8 @@
 
 int main( int argc, char *argv[] )
 {
-    int ret = 0;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_net_context server_fd;
     unsigned char buf[1024];
     mbedtls_entropy_context entropy;
@@ -180,7 +183,6 @@
     {
     usage:
         mbedtls_printf( USAGE );
-        ret = 2;
         goto exit;
     }
 
@@ -252,19 +254,23 @@
 
     if( strlen( opt.ca_path ) )
     {
-        ret = mbedtls_x509_crt_parse_path( &cacert, opt.ca_path );
+        if( ( ret = mbedtls_x509_crt_parse_path( &cacert, opt.ca_path ) ) < 0 )
+        {
+            mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse_path returned -0x%x\n\n", -ret );
+            goto exit;
+        }
+
         verify = 1;
     }
     else if( strlen( opt.ca_file ) )
     {
-        ret = mbedtls_x509_crt_parse_file( &cacert, opt.ca_file );
-        verify = 1;
-    }
+        if( ( ret = mbedtls_x509_crt_parse_file( &cacert, opt.ca_file ) ) < 0 )
+        {
+            mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse_file returned -0x%x\n\n", -ret );
+            goto exit;
+        }
 
-    if( ret < 0 )
-    {
-        mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse returned -0x%x\n\n", -ret );
-        goto exit;
+        verify = 1;
     }
 
     mbedtls_printf( " ok (%d skipped)\n", ret );
@@ -332,8 +338,6 @@
             cur = cur->next;
         }
 
-        ret = 0;
-
         /*
          * 1.3 Verify the certificate
          */
@@ -470,6 +474,8 @@
     else
         goto usage;
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
 
     mbedtls_net_free( &server_fd );
@@ -485,10 +491,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    if( ret < 0 )
-        ret = 1;
-
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
           MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C &&
diff --git a/programs/x509/cert_req.c b/programs/x509/cert_req.c
index 30df216..a32ac50 100644
--- a/programs/x509/cert_req.c
+++ b/programs/x509/cert_req.c
@@ -29,8 +29,11 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if !defined(MBEDTLS_X509_CSR_WRITE_C) || !defined(MBEDTLS_FS_IO) ||  \
     !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_SHA256_C) || \
@@ -133,7 +136,8 @@
 
 int main( int argc, char *argv[] )
 {
-    int ret = 0;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_pk_context key;
     char buf[1024];
     int i;
@@ -156,7 +160,6 @@
     {
     usage:
         mbedtls_printf( USAGE );
-        ret = 1;
         goto exit;
     }
 
@@ -317,9 +320,11 @@
 
     mbedtls_printf( " ok\n" );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
 
-    if( ret != 0 && ret != 1)
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
     {
 #ifdef MBEDTLS_ERROR_C
         mbedtls_strerror( ret, buf, sizeof( buf ) );
@@ -339,7 +344,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_X509_CSR_WRITE_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
           MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_PEM_WRITE_C */
diff --git a/programs/x509/cert_write.c b/programs/x509/cert_write.c
index 12baf72..09a91e0 100644
--- a/programs/x509/cert_write.c
+++ b/programs/x509/cert_write.c
@@ -29,8 +29,11 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if !defined(MBEDTLS_X509_CRT_WRITE_C) || \
     !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
@@ -211,7 +214,8 @@
 
 int main( int argc, char *argv[] )
 {
-    int ret = 0;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_x509_crt issuer_crt;
     mbedtls_pk_context loaded_issuer_key, loaded_subject_key;
     mbedtls_pk_context *issuer_key = &loaded_issuer_key,
@@ -248,7 +252,6 @@
     {
     usage:
         mbedtls_printf( USAGE );
-        ret = 1;
         goto exit;
     }
 
@@ -611,7 +614,6 @@
         {
             mbedtls_printf( " failed\n  !  issuer_key does not match "
                             "issuer certificate\n\n" );
-            ret = -1;
             goto exit;
         }
     }
@@ -784,6 +786,8 @@
 
     mbedtls_printf( " ok\n" );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
     mbedtls_x509write_crt_free( &crt );
     mbedtls_pk_free( &loaded_subject_key );
@@ -797,7 +801,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_X509_CRT_WRITE_C && MBEDTLS_X509_CRT_PARSE_C &&
           MBEDTLS_FS_IO && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C &&
diff --git a/programs/x509/crl_app.c b/programs/x509/crl_app.c
index 210d19e..f831683 100644
--- a/programs/x509/crl_app.c
+++ b/programs/x509/crl_app.c
@@ -29,8 +29,11 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) ||  \
     !defined(MBEDTLS_X509_CRL_PARSE_C) || !defined(MBEDTLS_FS_IO)
@@ -67,7 +70,8 @@
 
 int main( int argc, char *argv[] )
 {
-    int ret = 0;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     unsigned char buf[100000];
     mbedtls_x509_crl crl;
     int i;
@@ -131,6 +135,8 @@
 
     mbedtls_printf( "%s\n", buf );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
     mbedtls_x509_crl_free( &crl );
 
@@ -139,7 +145,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_X509_CRL_PARSE_C &&
           MBEDTLS_FS_IO */
diff --git a/programs/x509/req_app.c b/programs/x509/req_app.c
index 8410a53..0f20c85 100644
--- a/programs/x509/req_app.c
+++ b/programs/x509/req_app.c
@@ -29,8 +29,11 @@
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define mbedtls_printf     printf
-#endif
+#include <stdlib.h>
+#define mbedtls_printf          printf
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
 
 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) ||  \
     !defined(MBEDTLS_X509_CSR_PARSE_C) || !defined(MBEDTLS_FS_IO)
@@ -67,7 +70,8 @@
 
 int main( int argc, char *argv[] )
 {
-    int ret = 0;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
     unsigned char buf[100000];
     mbedtls_x509_csr csr;
     int i;
@@ -131,6 +135,8 @@
 
     mbedtls_printf( "%s\n", buf );
 
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
 exit:
     mbedtls_x509_csr_free( &csr );
 
@@ -139,7 +145,7 @@
     fflush( stdout ); getchar();
 #endif
 
-    return( ret );
+    return( exit_code );
 }
 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_X509_CSR_PARSE_C &&
           MBEDTLS_FS_IO */
diff --git a/tests/compat.sh b/tests/compat.sh
index d383cb4..bf65e5e 100755
--- a/tests/compat.sh
+++ b/tests/compat.sh
@@ -42,6 +42,9 @@
             PEER_GNUTLS=""
         else
             PEER_GNUTLS=" GnuTLS"
+            if [ $MINOR -lt 4 ]; then
+                GNUTLS_MINOR_LT_FOUR='x'
+            fi
         fi
     fi
 else
@@ -58,7 +61,8 @@
 # - RC4, single-DES: requires legacy OpenSSL/GnuTLS versions
 #   avoid plain DES but keep 3DES-EDE-CBC (mbedTLS), DES-CBC3 (OpenSSL)
 # - ARIA: not in default config.h + requires OpenSSL >= 1.1.1
-EXCLUDE='NULL\|DES-CBC-\|RC4\|ARCFOUR\|ARIA'
+# - ChachaPoly: requires OpenSSL >= 1.1.0
+EXCLUDE='NULL\|DES-CBC-\|RC4\|ARCFOUR\|ARIA\|CHACHA20-POLY1305'
 VERBOSE=""
 MEMCHECK=0
 PEERS="OpenSSL$PEER_GNUTLS mbedTLS"
@@ -437,6 +441,9 @@
 # NOTE: for some reason RSA-PSK doesn't work with OpenSSL,
 # so RSA-PSK ciphersuites need to go in other sections, see
 # https://github.com/ARMmbed/mbedtls/issues/1419
+#
+# ChachaPoly suites are here rather than in "common", as they were added in
+# GnuTLS in 3.5.0 and the CI only has 3.4.x so far.
 add_openssl_ciphersuites()
 {
     case $TYPE in
@@ -468,6 +475,7 @@
                     TLS-ECDH-ECDSA-WITH-AES-256-GCM-SHA384          \
                     TLS-ECDHE-ECDSA-WITH-ARIA-256-GCM-SHA384        \
                     TLS-ECDHE-ECDSA-WITH-ARIA-128-GCM-SHA256        \
+                    TLS-ECDHE-ECDSA-WITH-CHACHA20-POLY1305-SHA256   \
                     "
                 O_CIPHERS="$O_CIPHERS               \
                     ECDH-ECDSA-AES128-SHA256        \
@@ -476,6 +484,7 @@
                     ECDH-ECDSA-AES256-GCM-SHA384    \
                     ECDHE-ECDSA-ARIA256-GCM-SHA384  \
                     ECDHE-ECDSA-ARIA128-GCM-SHA256  \
+                    ECDHE-ECDSA-CHACHA20-POLY1305   \
                     "
             fi
             ;;
@@ -498,6 +507,8 @@
                     TLS-ECDHE-RSA-WITH-ARIA-128-GCM-SHA256          \
                     TLS-DHE-RSA-WITH-ARIA-128-GCM-SHA256            \
                     TLS-RSA-WITH-ARIA-128-GCM-SHA256                \
+                    TLS-DHE-RSA-WITH-CHACHA20-POLY1305-SHA256       \
+                    TLS-ECDHE-RSA-WITH-CHACHA20-POLY1305-SHA256     \
                     "
                 O_CIPHERS="$O_CIPHERS               \
                     ECDHE-ARIA256-GCM-SHA384        \
@@ -506,6 +517,8 @@
                     ECDHE-ARIA128-GCM-SHA256        \
                     DHE-RSA-ARIA128-GCM-SHA256      \
                     ARIA128-GCM-SHA256              \
+                    DHE-RSA-CHACHA20-POLY1305       \
+                    ECDHE-RSA-CHACHA20-POLY1305     \
                     "
             fi
             ;;
@@ -518,12 +531,18 @@
                     TLS-DHE-PSK-WITH-ARIA-128-GCM-SHA256            \
                     TLS-PSK-WITH-ARIA-256-GCM-SHA384                \
                     TLS-PSK-WITH-ARIA-128-GCM-SHA256                \
+                    TLS-PSK-WITH-CHACHA20-POLY1305-SHA256           \
+                    TLS-ECDHE-PSK-WITH-CHACHA20-POLY1305-SHA256     \
+                    TLS-DHE-PSK-WITH-CHACHA20-POLY1305-SHA256       \
                     "
                 O_CIPHERS="$O_CIPHERS               \
                     DHE-PSK-ARIA256-GCM-SHA384      \
                     DHE-PSK-ARIA128-GCM-SHA256      \
                     PSK-ARIA256-GCM-SHA384          \
                     PSK-ARIA128-GCM-SHA256          \
+                    DHE-PSK-CHACHA20-POLY1305       \
+                    ECDHE-PSK-CHACHA20-POLY1305     \
+                    PSK-CHACHA20-POLY1305           \
                     "
             fi
             ;;
@@ -545,12 +564,20 @@
                     TLS-ECDHE-ECDSA-WITH-CAMELLIA-256-CBC-SHA384    \
                     TLS-ECDHE-ECDSA-WITH-CAMELLIA-128-GCM-SHA256    \
                     TLS-ECDHE-ECDSA-WITH-CAMELLIA-256-GCM-SHA384    \
+                    TLS-ECDHE-ECDSA-WITH-AES-128-CCM                \
+                    TLS-ECDHE-ECDSA-WITH-AES-256-CCM                \
+                    TLS-ECDHE-ECDSA-WITH-AES-128-CCM-8              \
+                    TLS-ECDHE-ECDSA-WITH-AES-256-CCM-8              \
                    "
                 G_CIPHERS="$G_CIPHERS                               \
                     +ECDHE-ECDSA:+CAMELLIA-128-CBC:+SHA256          \
                     +ECDHE-ECDSA:+CAMELLIA-256-CBC:+SHA384          \
                     +ECDHE-ECDSA:+CAMELLIA-128-GCM:+AEAD            \
                     +ECDHE-ECDSA:+CAMELLIA-256-GCM:+AEAD            \
+                    +ECDHE-ECDSA:+AES-128-CCM:+AEAD                 \
+                    +ECDHE-ECDSA:+AES-256-CCM:+AEAD                 \
+                    +ECDHE-ECDSA:+AES-128-CCM-8:+AEAD               \
+                    +ECDHE-ECDSA:+AES-256-CCM-8:+AEAD               \
                    "
             fi
             ;;
@@ -580,6 +607,14 @@
                     TLS-DHE-RSA-WITH-CAMELLIA-256-GCM-SHA384    \
                     TLS-RSA-WITH-CAMELLIA-128-GCM-SHA256        \
                     TLS-RSA-WITH-CAMELLIA-256-GCM-SHA384        \
+                    TLS-RSA-WITH-AES-128-CCM                    \
+                    TLS-RSA-WITH-AES-256-CCM                    \
+                    TLS-DHE-RSA-WITH-AES-128-CCM                \
+                    TLS-DHE-RSA-WITH-AES-256-CCM                \
+                    TLS-RSA-WITH-AES-128-CCM-8                  \
+                    TLS-RSA-WITH-AES-256-CCM-8                  \
+                    TLS-DHE-RSA-WITH-AES-128-CCM-8              \
+                    TLS-DHE-RSA-WITH-AES-256-CCM-8              \
                     "
                 G_CIPHERS="$G_CIPHERS                           \
                     +ECDHE-RSA:+CAMELLIA-128-CBC:+SHA256        \
@@ -594,6 +629,14 @@
                     +DHE-RSA:+CAMELLIA-256-GCM:+AEAD            \
                     +RSA:+CAMELLIA-128-GCM:+AEAD                \
                     +RSA:+CAMELLIA-256-GCM:+AEAD                \
+                    +RSA:+AES-128-CCM:+AEAD                     \
+                    +RSA:+AES-256-CCM:+AEAD                     \
+                    +RSA:+AES-128-CCM-8:+AEAD                   \
+                    +RSA:+AES-256-CCM-8:+AEAD                   \
+                    +DHE-RSA:+AES-128-CCM:+AEAD                 \
+                    +DHE-RSA:+AES-256-CCM:+AEAD                 \
+                    +DHE-RSA:+AES-128-CCM-8:+AEAD               \
+                    +DHE-RSA:+AES-256-CCM-8:+AEAD               \
                     "
             fi
             ;;
@@ -665,6 +708,14 @@
                     TLS-PSK-WITH-AES-256-GCM-SHA384             \
                     TLS-DHE-PSK-WITH-AES-128-GCM-SHA256         \
                     TLS-DHE-PSK-WITH-AES-256-GCM-SHA384         \
+                    TLS-PSK-WITH-AES-128-CCM                    \
+                    TLS-PSK-WITH-AES-256-CCM                    \
+                    TLS-DHE-PSK-WITH-AES-128-CCM                \
+                    TLS-DHE-PSK-WITH-AES-256-CCM                \
+                    TLS-PSK-WITH-AES-128-CCM-8                  \
+                    TLS-PSK-WITH-AES-256-CCM-8                  \
+                    TLS-DHE-PSK-WITH-AES-128-CCM-8              \
+                    TLS-DHE-PSK-WITH-AES-256-CCM-8              \
                     TLS-RSA-PSK-WITH-CAMELLIA-128-GCM-SHA256    \
                     TLS-RSA-PSK-WITH-CAMELLIA-256-GCM-SHA384    \
                     TLS-PSK-WITH-CAMELLIA-128-GCM-SHA256        \
@@ -695,6 +746,14 @@
                     +PSK:+AES-256-GCM:+AEAD                     \
                     +DHE-PSK:+AES-128-GCM:+AEAD                 \
                     +DHE-PSK:+AES-256-GCM:+AEAD                 \
+                    +PSK:+AES-128-CCM:+AEAD                     \
+                    +PSK:+AES-256-CCM:+AEAD                     \
+                    +DHE-PSK:+AES-128-CCM:+AEAD                 \
+                    +DHE-PSK:+AES-256-CCM:+AEAD                 \
+                    +PSK:+AES-128-CCM-8:+AEAD                   \
+                    +PSK:+AES-256-CCM-8:+AEAD                   \
+                    +DHE-PSK:+AES-128-CCM-8:+AEAD               \
+                    +DHE-PSK:+AES-256-CCM-8:+AEAD               \
                     +RSA-PSK:+CAMELLIA-128-GCM:+AEAD            \
                     +RSA-PSK:+CAMELLIA-256-GCM:+AEAD            \
                     +PSK:+CAMELLIA-128-GCM:+AEAD                \
@@ -737,10 +796,6 @@
                 M_CIPHERS="$M_CIPHERS                               \
                     TLS-ECDH-ECDSA-WITH-CAMELLIA-128-GCM-SHA256     \
                     TLS-ECDH-ECDSA-WITH-CAMELLIA-256-GCM-SHA384     \
-                    TLS-ECDHE-ECDSA-WITH-AES-128-CCM                \
-                    TLS-ECDHE-ECDSA-WITH-AES-256-CCM                \
-                    TLS-ECDHE-ECDSA-WITH-AES-128-CCM-8              \
-                    TLS-ECDHE-ECDSA-WITH-AES-256-CCM-8              \
                     TLS-ECDHE-ECDSA-WITH-ARIA-256-CBC-SHA384        \
                     TLS-ECDHE-ECDSA-WITH-ARIA-128-CBC-SHA256        \
                     TLS-ECDH-ECDSA-WITH-ARIA-256-GCM-SHA384         \
@@ -755,14 +810,6 @@
             if [ `minor_ver "$MODE"` -ge 3 ]
             then
                 M_CIPHERS="$M_CIPHERS                               \
-                    TLS-RSA-WITH-AES-128-CCM                        \
-                    TLS-RSA-WITH-AES-256-CCM                        \
-                    TLS-DHE-RSA-WITH-AES-128-CCM                    \
-                    TLS-DHE-RSA-WITH-AES-256-CCM                    \
-                    TLS-RSA-WITH-AES-128-CCM-8                      \
-                    TLS-RSA-WITH-AES-256-CCM-8                      \
-                    TLS-DHE-RSA-WITH-AES-128-CCM-8                  \
-                    TLS-DHE-RSA-WITH-AES-256-CCM-8                  \
                     TLS-ECDHE-RSA-WITH-ARIA-256-CBC-SHA384          \
                     TLS-DHE-RSA-WITH-ARIA-256-CBC-SHA384            \
                     TLS-ECDHE-RSA-WITH-ARIA-128-CBC-SHA256          \
@@ -789,14 +836,6 @@
             if [ `minor_ver "$MODE"` -ge 3 ]
             then
                 M_CIPHERS="$M_CIPHERS                               \
-                    TLS-PSK-WITH-AES-128-CCM                        \
-                    TLS-PSK-WITH-AES-256-CCM                        \
-                    TLS-DHE-PSK-WITH-AES-128-CCM                    \
-                    TLS-DHE-PSK-WITH-AES-256-CCM                    \
-                    TLS-PSK-WITH-AES-128-CCM-8                      \
-                    TLS-PSK-WITH-AES-256-CCM-8                      \
-                    TLS-DHE-PSK-WITH-AES-128-CCM-8                  \
-                    TLS-DHE-PSK-WITH-AES-256-CCM-8                  \
                     TLS-RSA-PSK-WITH-ARIA-256-CBC-SHA384            \
                     TLS-RSA-PSK-WITH-ARIA-128-CBC-SHA256            \
                     TLS-PSK-WITH-ARIA-256-CBC-SHA384                \
@@ -807,6 +846,7 @@
                     TLS-ECDHE-PSK-WITH-ARIA-128-CBC-SHA256          \
                     TLS-DHE-PSK-WITH-ARIA-256-CBC-SHA384            \
                     TLS-DHE-PSK-WITH-ARIA-128-CBC-SHA256            \
+                    TLS-RSA-PSK-WITH-CHACHA20-POLY1305-SHA256       \
                     "
             fi
             ;;
@@ -842,10 +882,17 @@
             exit 1;
     esac
 
+    # GnuTLS < 3.4 will choke if we try to allow CCM-8
+    if [ -z "${GNUTLS_MINOR_LT_FOUR-}" ]; then
+        G_PRIO_CCM="+AES-256-CCM-8:+AES-128-CCM-8:"
+    else
+        G_PRIO_CCM=""
+    fi
+
     M_SERVER_ARGS="server_port=$PORT server_addr=0.0.0.0 force_version=$MODE arc4=1"
     O_SERVER_ARGS="-accept $PORT -cipher NULL,ALL -$MODE -dhparam data_files/dhparams.pem"
     G_SERVER_ARGS="-p $PORT --http $G_MODE"
-    G_SERVER_PRIO="NORMAL:+ARCFOUR-128:+NULL:+MD5:+PSK:+DHE-PSK:+ECDHE-PSK:+RSA-PSK:-VERS-TLS-ALL:$G_PRIO_MODE"
+    G_SERVER_PRIO="NORMAL:${G_PRIO_CCM}+ARCFOUR-128:+NULL:+MD5:+PSK:+DHE-PSK:+ECDHE-PSK:+RSA-PSK:-VERS-TLS-ALL:$G_PRIO_MODE"
 
     # with OpenSSL 1.0.1h, -www, -WWW and -HTTP break DTLS handshakes
     if is_dtls "$MODE"; then
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index cafb81c..1e6fd8c 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -535,6 +535,28 @@
 msg "test: RSA_NO_CRT - RSA-related part of compat.sh (ASan build)" # ~ 3 min
 tests/compat.sh -t RSA
 
+msg "build: small SSL_OUT_CONTENT_LEN (ASan build)"
+cleanup
+cp "$CONFIG_H" "$CONFIG_BAK"
+scripts/config.pl set MBEDTLS_SSL_IN_CONTENT_LEN 16384
+scripts/config.pl set MBEDTLS_SSL_OUT_CONTENT_LEN 4096
+CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
+make
+
+msg "test: small SSL_OUT_CONTENT_LEN - ssl-opt.sh MFL and large packet tests"
+if_build_succeeded tests/ssl-opt.sh -f "Max fragment\|Large packet"
+
+msg "build: small SSL_IN_CONTENT_LEN (ASan build)"
+cleanup
+cp "$CONFIG_H" "$CONFIG_BAK"
+scripts/config.pl set MBEDTLS_SSL_IN_CONTENT_LEN 4096
+scripts/config.pl set MBEDTLS_SSL_OUT_CONTENT_LEN 16384
+CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
+make
+
+msg "test: small SSL_IN_CONTENT_LEN - ssl-opt.sh MFL tests"
+if_build_succeeded tests/ssl-opt.sh -f "Max fragment"
+
 msg "build: cmake, full config, clang" # ~ 50s
 cleanup
 cp "$CONFIG_H" "$CONFIG_BAK"
@@ -552,8 +574,8 @@
 msg "test: compat.sh RC4, DES & NULL (full config)" # ~ 2 min
 if_build_succeeded env OPENSSL_CMD="$OPENSSL_LEGACY" GNUTLS_CLI="$GNUTLS_LEGACY_CLI" GNUTLS_SERV="$GNUTLS_LEGACY_SERV" tests/compat.sh -e '3DES\|DES-CBC3' -f 'NULL\|DES\|RC4\|ARCFOUR'
 
-msg "test: compat.sh ARIA"
-if_build_succeeded env OPENSSL_CMD="$OPENSSL_NEXT" tests/compat.sh -e '^$' -f 'ARIA'
+msg "test: compat.sh ARIA + ChachaPoly"
+if_build_succeeded env OPENSSL_CMD="$OPENSSL_NEXT" tests/compat.sh -e '^$' -f 'ARIA\|CHACHA'
 
 msg "build: make, full config + DEPRECATED_WARNING, gcc -O" # ~ 30s
 cleanup
@@ -655,6 +677,7 @@
 scripts/config.pl set MBEDTLS_NO_PLATFORM_ENTROPY # uses syscall() on GNU/Linux
 make CC=gcc CFLAGS='-Werror -Wall -Wextra -O0 -std=c99 -pedantic' lib
 
+# Run max fragment length tests with MFL disabled
 msg "build: default config except MFL extension (ASan build)" # ~ 30s
 cleanup
 cp "$CONFIG_H" "$CONFIG_BAK"
@@ -665,6 +688,18 @@
 msg "test: ssl-opt.sh, MFL-related tests"
 if_build_succeeded tests/ssl-opt.sh -f "Max fragment length"
 
+msg "build: no MFL extension, small SSL_OUT_CONTENT_LEN (ASan build)"
+cleanup
+cp "$CONFIG_H" "$CONFIG_BAK"
+scripts/config.pl unset MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
+scripts/config.pl set MBEDTLS_SSL_IN_CONTENT_LEN 16384
+scripts/config.pl set MBEDTLS_SSL_OUT_CONTENT_LEN 4096
+CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
+make
+
+msg "test: MFL tests (disabled MFL extension case) & large packet tests"
+if_build_succeeded tests/ssl-opt.sh -f "Max fragment length\|Large buffer"
+
 msg "build: default config with  MBEDTLS_TEST_NULL_ENTROPY (ASan build)"
 cleanup
 cp "$CONFIG_H" "$CONFIG_BAK"
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 9faeb67..0f61535 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -21,6 +21,11 @@
 
 set -u
 
+if cd $( dirname $0 ); then :; else
+    echo "cd $( dirname $0 ) failed" >&2
+    exit 1
+fi
+
 # default values, can be overriden by the environment
 : ${P_SRV:=../programs/ssl/ssl_server2}
 : ${P_CLI:=../programs/ssl/ssl_client2}
@@ -178,6 +183,25 @@
     fi
 }
 
+# Calculate the input & output maximum content lengths set in the config
+MAX_CONTENT_LEN=$( ../scripts/config.pl get MBEDTLS_SSL_MAX_CONTENT_LEN || echo "16384")
+MAX_IN_LEN=$( ../scripts/config.pl get MBEDTLS_SSL_IN_CONTENT_LEN || echo "$MAX_CONTENT_LEN")
+MAX_OUT_LEN=$( ../scripts/config.pl get MBEDTLS_SSL_OUT_CONTENT_LEN || echo "$MAX_CONTENT_LEN")
+
+if [ "$MAX_IN_LEN" -lt "$MAX_CONTENT_LEN" ]; then
+    MAX_CONTENT_LEN="$MAX_IN_LEN"
+fi
+if [ "$MAX_OUT_LEN" -lt "$MAX_CONTENT_LEN" ]; then
+    MAX_CONTENT_LEN="$MAX_OUT_LEN"
+fi
+
+# skip the next test if the SSL output buffer is less than 16KB
+requires_full_size_output_buffer() {
+    if [ "$MAX_OUT_LEN" -ne 16384 ]; then
+        SKIP_NEXT="YES"
+    fi
+}
+
 # skip the next test if valgrind is in use
 not_with_valgrind() {
     if [ "$MEMCHECK" -gt 0 ]; then
@@ -308,7 +332,7 @@
         done
     }
 else
-    echo "Warning: lsof not available, wait_server_start = sleep $START_DELAY"
+    echo "Warning: lsof not available, wait_server_start = sleep"
     wait_server_start() {
         sleep "$START_DELAY"
     }
@@ -626,11 +650,6 @@
 # MAIN
 #
 
-if cd $( dirname $0 ); then :; else
-    echo "cd $( dirname $0 ) failed" >&2
-    exit 1
-fi
-
 get_options "$@"
 
 # sanity checks, avoid an avalanche of errors
@@ -723,7 +742,7 @@
             "$P_CLI" \
             0 \
             -s "Protocol is TLSv1.2" \
-            -s "Ciphersuite is TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384" \
+            -s "Ciphersuite is TLS-ECDHE-RSA-WITH-CHACHA20-POLY1305-SHA256" \
             -s "client hello v3, signature_algorithm ext: 6" \
             -s "ECDHE curve: secp521r1" \
             -S "error" \
@@ -734,20 +753,14 @@
             "$P_CLI dtls=1" \
             0 \
             -s "Protocol is DTLSv1.2" \
-            -s "Ciphersuite is TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384"
+            -s "Ciphersuite is TLS-ECDHE-RSA-WITH-CHACHA20-POLY1305-SHA256"
 
 # Test current time in ServerHello
 requires_config_enabled MBEDTLS_HAVE_TIME
-run_test    "Default, ServerHello contains gmt_unix_time" \
+run_test    "ServerHello contains gmt_unix_time" \
             "$P_SRV debug_level=3" \
             "$P_CLI debug_level=3" \
             0 \
-            -s "Protocol is TLSv1.2" \
-            -s "Ciphersuite is TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384" \
-            -s "client hello v3, signature_algorithm ext: 6" \
-            -s "ECDHE curve: secp521r1" \
-            -S "error" \
-            -C "error" \
             -f "check_server_hello_time" \
             -F "check_server_hello_time"
 
@@ -1416,28 +1429,22 @@
 
 # Tests for Max Fragment Length extension
 
-MAX_CONTENT_LEN_EXPECT='16384'
-MAX_CONTENT_LEN_CONFIG=$( ../scripts/config.pl get MBEDTLS_SSL_MAX_CONTENT_LEN)
-
-if [ -n "$MAX_CONTENT_LEN_CONFIG" ] && [ "$MAX_CONTENT_LEN_CONFIG" -ne "$MAX_CONTENT_LEN_EXPECT" ]; then
-    printf "The ${CONFIG_H} file contains a value for the configuration of\n"
-    printf "MBEDTLS_SSL_MAX_CONTENT_LEN that is different from the script’s\n"
-    printf "test value of ${MAX_CONTENT_LEN_EXPECT}. \n"
-    printf "\n"
-    printf "The tests assume this value and if it changes, the tests in this\n"
-    printf "script should also be adjusted.\n"
-    printf "\n"
-
+if [ "$MAX_CONTENT_LEN" -lt "4096" ]; then
+    printf "${CONFIG_H} defines MBEDTLS_SSL_MAX_CONTENT_LEN to be less than 4096. Fragment length tests will fail.\n"
     exit 1
 fi
 
+if [ $MAX_CONTENT_LEN -ne 16384 ]; then
+    printf "Using non-default maximum content length $MAX_CONTENT_LEN\n"
+fi
+
 requires_config_enabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
 run_test    "Max fragment length: enabled, default" \
             "$P_SRV debug_level=3" \
             "$P_CLI debug_level=3" \
             0 \
-            -c "Maximum fragment length is 16384" \
-            -s "Maximum fragment length is 16384" \
+            -c "Maximum fragment length is $MAX_CONTENT_LEN" \
+            -s "Maximum fragment length is $MAX_CONTENT_LEN" \
             -C "client hello, adding max_fragment_length extension" \
             -S "found max fragment length extension" \
             -S "server hello, max_fragment_length extension" \
@@ -1446,46 +1453,50 @@
 requires_config_enabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
 run_test    "Max fragment length: enabled, default, larger message" \
             "$P_SRV debug_level=3" \
-            "$P_CLI debug_level=3 request_size=16385" \
+            "$P_CLI debug_level=3 request_size=$(( $MAX_CONTENT_LEN + 1))" \
             0 \
-            -c "Maximum fragment length is 16384" \
-            -s "Maximum fragment length is 16384" \
+            -c "Maximum fragment length is $MAX_CONTENT_LEN" \
+            -s "Maximum fragment length is $MAX_CONTENT_LEN" \
             -C "client hello, adding max_fragment_length extension" \
             -S "found max fragment length extension" \
             -S "server hello, max_fragment_length extension" \
             -C "found max_fragment_length extension" \
-            -c "16385 bytes written in 2 fragments" \
-            -s "16384 bytes read" \
+            -c "$(( $MAX_CONTENT_LEN + 1)) bytes written in 2 fragments" \
+            -s "$MAX_CONTENT_LEN bytes read" \
             -s "1 bytes read"
 
 requires_config_enabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
 run_test    "Max fragment length, DTLS: enabled, default, larger message" \
             "$P_SRV debug_level=3 dtls=1" \
-            "$P_CLI debug_level=3 dtls=1 request_size=16385" \
+            "$P_CLI debug_level=3 dtls=1 request_size=$(( $MAX_CONTENT_LEN + 1))" \
             1 \
-            -c "Maximum fragment length is 16384" \
-            -s "Maximum fragment length is 16384" \
+            -c "Maximum fragment length is $MAX_CONTENT_LEN" \
+            -s "Maximum fragment length is $MAX_CONTENT_LEN" \
             -C "client hello, adding max_fragment_length extension" \
             -S "found max fragment length extension" \
             -S "server hello, max_fragment_length extension" \
             -C "found max_fragment_length extension" \
             -c "fragment larger than.*maximum "
 
+# Run some tests with MBEDTLS_SSL_MAX_FRAGMENT_LENGTH disabled
+# (session fragment length will be 16384 regardless of mbedtls
+# content length configuration.)
+
 requires_config_disabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
 run_test    "Max fragment length: disabled, larger message" \
             "$P_SRV debug_level=3" \
-            "$P_CLI debug_level=3 request_size=16385" \
+            "$P_CLI debug_level=3 request_size=$(( $MAX_CONTENT_LEN + 1))" \
             0 \
             -C "Maximum fragment length is 16384" \
             -S "Maximum fragment length is 16384" \
-            -c "16385 bytes written in 2 fragments" \
-            -s "16384 bytes read" \
+            -c "$(( $MAX_CONTENT_LEN + 1)) bytes written in 2 fragments" \
+            -s "$MAX_CONTENT_LEN bytes read" \
             -s "1 bytes read"
 
 requires_config_disabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
 run_test    "Max fragment length DTLS: disabled, larger message" \
             "$P_SRV debug_level=3 dtls=1" \
-            "$P_CLI debug_level=3 dtls=1 request_size=16385" \
+            "$P_CLI debug_level=3 dtls=1 request_size=$(( $MAX_CONTENT_LEN + 1))" \
             1 \
             -C "Maximum fragment length is 16384" \
             -S "Maximum fragment length is 16384" \
@@ -1508,7 +1519,7 @@
             "$P_SRV debug_level=3 max_frag_len=4096" \
             "$P_CLI debug_level=3" \
             0 \
-            -c "Maximum fragment length is 16384" \
+            -c "Maximum fragment length is $MAX_CONTENT_LEN" \
             -s "Maximum fragment length is 4096" \
             -C "client hello, adding max_fragment_length extension" \
             -S "found max fragment length extension" \
@@ -2376,6 +2387,7 @@
     exit 1
 fi
 
+requires_full_size_output_buffer
 run_test    "Authentication: server max_int chain, client default" \
             "$P_SRV crt_file=data_files/dir-maxpath/c09.pem \
                     key_file=data_files/dir-maxpath/09.key" \
@@ -2383,6 +2395,7 @@
             0 \
             -C "X509 - A fatal error occured"
 
+requires_full_size_output_buffer
 run_test    "Authentication: server max_int+1 chain, client default" \
             "$P_SRV crt_file=data_files/dir-maxpath/c10.pem \
                     key_file=data_files/dir-maxpath/10.key" \
@@ -2390,6 +2403,7 @@
             1 \
             -c "X509 - A fatal error occured"
 
+requires_full_size_output_buffer
 run_test    "Authentication: server max_int+1 chain, client optional" \
             "$P_SRV crt_file=data_files/dir-maxpath/c10.pem \
                     key_file=data_files/dir-maxpath/10.key" \
@@ -2398,6 +2412,7 @@
             1 \
             -c "X509 - A fatal error occured"
 
+requires_full_size_output_buffer
 run_test    "Authentication: server max_int+1 chain, client none" \
             "$P_SRV crt_file=data_files/dir-maxpath/c10.pem \
                     key_file=data_files/dir-maxpath/10.key" \
@@ -2406,6 +2421,7 @@
             0 \
             -C "X509 - A fatal error occured"
 
+requires_full_size_output_buffer
 run_test    "Authentication: client max_int+1 chain, server default" \
             "$P_SRV ca_file=data_files/dir-maxpath/00.crt" \
             "$P_CLI crt_file=data_files/dir-maxpath/c10.pem \
@@ -2413,6 +2429,7 @@
             0 \
             -S "X509 - A fatal error occured"
 
+requires_full_size_output_buffer
 run_test    "Authentication: client max_int+1 chain, server optional" \
             "$P_SRV ca_file=data_files/dir-maxpath/00.crt auth_mode=optional" \
             "$P_CLI crt_file=data_files/dir-maxpath/c10.pem \
@@ -2420,6 +2437,7 @@
             1 \
             -s "X509 - A fatal error occured"
 
+requires_full_size_output_buffer
 run_test    "Authentication: client max_int+1 chain, server required" \
             "$P_SRV ca_file=data_files/dir-maxpath/00.crt auth_mode=required" \
             "$P_CLI crt_file=data_files/dir-maxpath/c10.pem \
@@ -2427,6 +2445,7 @@
             1 \
             -s "X509 - A fatal error occured"
 
+requires_full_size_output_buffer
 run_test    "Authentication: client max_int chain, server required" \
             "$P_SRV ca_file=data_files/dir-maxpath/00.crt auth_mode=required" \
             "$P_CLI crt_file=data_files/dir-maxpath/c09.pem \
@@ -3970,14 +3989,19 @@
 
 # Test for large packets
 
+# How many fragments do we expect to write $1 bytes?
+fragments_for_write() {
+    echo "$(( ( $1 + $MAX_OUT_LEN - 1 ) / $MAX_OUT_LEN ))"
+}
+
 requires_config_enabled MBEDTLS_SSL_PROTO_SSL3
 run_test    "Large packet SSLv3 BlockCipher" \
             "$P_SRV min_version=ssl3" \
             "$P_CLI request_size=16384 force_version=ssl3 recsplit=0 \
              force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA" \
             0 \
-            -c "16384 bytes written in 1 fragments" \
-            -s "Read from client: 16384 bytes read"
+            -c "16384 bytes written in $(fragments_for_write 16384) fragments" \
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 requires_config_enabled MBEDTLS_SSL_PROTO_SSL3
 run_test    "Large packet SSLv3 StreamCipher" \
@@ -3985,23 +4009,23 @@
             "$P_CLI request_size=16384 force_version=ssl3 \
              force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA" \
             0 \
-            -c "16384 bytes written in 1 fragments" \
-            -s "Read from client: 16384 bytes read"
+            -c "16384 bytes written in $(fragments_for_write 16384) fragments" \
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 run_test    "Large packet TLS 1.0 BlockCipher" \
             "$P_SRV" \
             "$P_CLI request_size=16384 force_version=tls1 recsplit=0 \
              force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA" \
             0 \
-            -c "16384 bytes written in 1 fragments" \
-            -s "Read from client: 16384 bytes read"
+            -c "16384 bytes written in $(fragments_for_write 16384) fragments" \
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 run_test    "Large packet TLS 1.0 BlockCipher, without EtM" \
             "$P_SRV" \
             "$P_CLI request_size=16384 force_version=tls1 etm=0 recsplit=0 \
              force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA" \
             0 \
-            -s "Read from client: 16384 bytes read"
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 requires_config_enabled MBEDTLS_SSL_TRUNCATED_HMAC
 run_test    "Large packet TLS 1.0 BlockCipher, truncated MAC" \
@@ -4009,8 +4033,8 @@
             "$P_CLI request_size=16384 force_version=tls1 recsplit=0 \
              force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA trunc_hmac=1" \
             0 \
-            -c "16384 bytes written in 1 fragments" \
-            -s "Read from client: 16384 bytes read"
+            -c "16384 bytes written in $(fragments_for_write 16384) fragments" \
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 requires_config_enabled MBEDTLS_SSL_TRUNCATED_HMAC
 run_test    "Large packet TLS 1.0 BlockCipher, without EtM, truncated MAC" \
@@ -4018,21 +4042,21 @@
             "$P_CLI request_size=16384 force_version=tls1 etm=0 recsplit=0 \
              force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA trunc_hmac=1" \
             0 \
-            -s "Read from client: 16384 bytes read"
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 run_test    "Large packet TLS 1.0 StreamCipher" \
             "$P_SRV arc4=1 force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA" \
             "$P_CLI request_size=16384 force_version=tls1 \
              force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA" \
             0 \
-            -s "Read from client: 16384 bytes read"
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 run_test    "Large packet TLS 1.0 StreamCipher, without EtM" \
             "$P_SRV arc4=1 force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA" \
             "$P_CLI request_size=16384 force_version=tls1 \
              force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA etm=0" \
             0 \
-            -s "Read from client: 16384 bytes read"
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 requires_config_enabled MBEDTLS_SSL_TRUNCATED_HMAC
 run_test    "Large packet TLS 1.0 StreamCipher, truncated MAC" \
@@ -4040,7 +4064,7 @@
             "$P_CLI request_size=16384 force_version=tls1 \
              force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA trunc_hmac=1" \
             0 \
-            -s "Read from client: 16384 bytes read"
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 requires_config_enabled MBEDTLS_SSL_TRUNCATED_HMAC
 run_test    "Large packet TLS 1.0 StreamCipher, without EtM, truncated MAC" \
@@ -4048,23 +4072,23 @@
             "$P_CLI request_size=16384 force_version=tls1 \
              force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA trunc_hmac=1 etm=0" \
             0 \
-            -c "16384 bytes written in 1 fragments" \
-            -s "Read from client: 16384 bytes read"
+            -c "16384 bytes written in $(fragments_for_write 16384) fragments" \
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 run_test    "Large packet TLS 1.1 BlockCipher" \
             "$P_SRV" \
             "$P_CLI request_size=16384 force_version=tls1_1 \
              force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA" \
             0 \
-            -c "16384 bytes written in 1 fragments" \
-            -s "Read from client: 16384 bytes read"
+            -c "16384 bytes written in $(fragments_for_write 16384) fragments" \
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 run_test    "Large packet TLS 1.1 BlockCipher, without EtM" \
             "$P_SRV" \
             "$P_CLI request_size=16384 force_version=tls1_1 etm=0 \
              force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA" \
             0 \
-            -s "Read from client: 16384 bytes read"
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 requires_config_enabled MBEDTLS_SSL_TRUNCATED_HMAC
 run_test    "Large packet TLS 1.1 BlockCipher, truncated MAC" \
@@ -4072,7 +4096,7 @@
             "$P_CLI request_size=16384 force_version=tls1_1 \
              force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA trunc_hmac=1" \
             0 \
-            -s "Read from client: 16384 bytes read"
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 requires_config_enabled MBEDTLS_SSL_TRUNCATED_HMAC
 run_test    "Large packet TLS 1.1 BlockCipher, without EtM, truncated MAC" \
@@ -4080,23 +4104,23 @@
             "$P_CLI request_size=16384 force_version=tls1_1 \
              force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA trunc_hmac=1 etm=0" \
             0 \
-            -s "Read from client: 16384 bytes read"
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 run_test    "Large packet TLS 1.1 StreamCipher" \
             "$P_SRV arc4=1 force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA" \
             "$P_CLI request_size=16384 force_version=tls1_1 \
              force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA" \
             0 \
-            -c "16384 bytes written in 1 fragments" \
-            -s "Read from client: 16384 bytes read"
+            -c "16384 bytes written in $(fragments_for_write 16384) fragments" \
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 run_test    "Large packet TLS 1.1 StreamCipher, without EtM" \
             "$P_SRV arc4=1 force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA" \
             "$P_CLI request_size=16384 force_version=tls1_1 \
              force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA etm=0" \
             0 \
-            -c "16384 bytes written in 1 fragments" \
-            -s "Read from client: 16384 bytes read"
+            -c "16384 bytes written in $(fragments_for_write 16384) fragments" \
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 requires_config_enabled MBEDTLS_SSL_TRUNCATED_HMAC
 run_test    "Large packet TLS 1.1 StreamCipher, truncated MAC" \
@@ -4104,7 +4128,7 @@
             "$P_CLI request_size=16384 force_version=tls1_1 \
              force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA trunc_hmac=1" \
             0 \
-            -s "Read from client: 16384 bytes read"
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 requires_config_enabled MBEDTLS_SSL_TRUNCATED_HMAC
 run_test    "Large packet TLS 1.1 StreamCipher, without EtM, truncated MAC" \
@@ -4112,31 +4136,31 @@
             "$P_CLI request_size=16384 force_version=tls1_1 \
              force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA trunc_hmac=1 etm=0" \
             0 \
-            -c "16384 bytes written in 1 fragments" \
-            -s "Read from client: 16384 bytes read"
+            -c "16384 bytes written in $(fragments_for_write 16384) fragments" \
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 run_test    "Large packet TLS 1.2 BlockCipher" \
             "$P_SRV" \
             "$P_CLI request_size=16384 force_version=tls1_2 \
              force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA" \
             0 \
-            -c "16384 bytes written in 1 fragments" \
-            -s "Read from client: 16384 bytes read"
+            -c "16384 bytes written in $(fragments_for_write 16384) fragments" \
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 run_test    "Large packet TLS 1.2 BlockCipher, without EtM" \
             "$P_SRV" \
             "$P_CLI request_size=16384 force_version=tls1_2 etm=0 \
              force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA" \
             0 \
-            -s "Read from client: 16384 bytes read"
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 run_test    "Large packet TLS 1.2 BlockCipher larger MAC" \
             "$P_SRV" \
             "$P_CLI request_size=16384 force_version=tls1_2 \
              force_ciphersuite=TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA384" \
             0 \
-            -c "16384 bytes written in 1 fragments" \
-            -s "Read from client: 16384 bytes read"
+            -c "16384 bytes written in $(fragments_for_write 16384) fragments" \
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 requires_config_enabled MBEDTLS_SSL_TRUNCATED_HMAC
 run_test    "Large packet TLS 1.2 BlockCipher, truncated MAC" \
@@ -4144,7 +4168,7 @@
             "$P_CLI request_size=16384 force_version=tls1_2 \
              force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA trunc_hmac=1" \
             0 \
-            -s "Read from client: 16384 bytes read"
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 requires_config_enabled MBEDTLS_SSL_TRUNCATED_HMAC
 run_test    "Large packet TLS 1.2 BlockCipher, without EtM, truncated MAC" \
@@ -4152,23 +4176,23 @@
             "$P_CLI request_size=16384 force_version=tls1_2 \
              force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA trunc_hmac=1 etm=0" \
             0 \
-            -c "16384 bytes written in 1 fragments" \
-            -s "Read from client: 16384 bytes read"
+            -c "16384 bytes written in $(fragments_for_write 16384) fragments" \
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 run_test    "Large packet TLS 1.2 StreamCipher" \
             "$P_SRV arc4=1 force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA" \
             "$P_CLI request_size=16384 force_version=tls1_2 \
              force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA" \
             0 \
-            -c "16384 bytes written in 1 fragments" \
-            -s "Read from client: 16384 bytes read"
+            -c "16384 bytes written in $(fragments_for_write 16384) fragments" \
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 run_test    "Large packet TLS 1.2 StreamCipher, without EtM" \
             "$P_SRV arc4=1 force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA" \
             "$P_CLI request_size=16384 force_version=tls1_2 \
              force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA etm=0" \
             0 \
-            -s "Read from client: 16384 bytes read"
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 requires_config_enabled MBEDTLS_SSL_TRUNCATED_HMAC
 run_test    "Large packet TLS 1.2 StreamCipher, truncated MAC" \
@@ -4176,7 +4200,7 @@
             "$P_CLI request_size=16384 force_version=tls1_2 \
              force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA trunc_hmac=1" \
             0 \
-            -s "Read from client: 16384 bytes read"
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 requires_config_enabled MBEDTLS_SSL_TRUNCATED_HMAC
 run_test    "Large packet TLS 1.2 StreamCipher, without EtM, truncated MAC" \
@@ -4184,24 +4208,24 @@
             "$P_CLI request_size=16384 force_version=tls1_2 \
              force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA trunc_hmac=1 etm=0" \
             0 \
-            -c "16384 bytes written in 1 fragments" \
-            -s "Read from client: 16384 bytes read"
+            -c "16384 bytes written in $(fragments_for_write 16384) fragments" \
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 run_test    "Large packet TLS 1.2 AEAD" \
             "$P_SRV" \
             "$P_CLI request_size=16384 force_version=tls1_2 \
              force_ciphersuite=TLS-RSA-WITH-AES-256-CCM" \
             0 \
-            -c "16384 bytes written in 1 fragments" \
-            -s "Read from client: 16384 bytes read"
+            -c "16384 bytes written in $(fragments_for_write 16384) fragments" \
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 run_test    "Large packet TLS 1.2 AEAD shorter tag" \
             "$P_SRV" \
             "$P_CLI request_size=16384 force_version=tls1_2 \
              force_ciphersuite=TLS-RSA-WITH-AES-256-CCM-8" \
             0 \
-            -c "16384 bytes written in 1 fragments" \
-            -s "Read from client: 16384 bytes read"
+            -c "16384 bytes written in $(fragments_for_write 16384) fragments" \
+            -s "Read from client: $MAX_CONTENT_LEN bytes read"
 
 # Tests of asynchronous private key support in SSL
 
diff --git a/tests/suites/test_suite_aria.data b/tests/suites/test_suite_aria.data
index 46c6ecc..8cb2d2a 100644
--- a/tests/suites/test_suite_aria.data
+++ b/tests/suites/test_suite_aria.data
@@ -93,3 +93,6 @@
 
 ARIA-256-CFB128 Decrypt - Official Test Vectors 1.0
 aria_decrypt_cfb128:"00112233445566778899aabbccddeeff00112233445566778899aabbccddeeff":"0f1e2d3c4b5a69788796a5b4c3d2e1f0":"26834705b0f2c0e2588d4a7f09009635f28bb93d8c31f870ec1e0bdb082b66fa402dd9c202be300c4517d196b14d4ce11dce97f7aaba54341b0d872cc9b63753a3e8556a14be6f7b3e27e3cfc39caf80f2a355aa50dc83c09c7b11828694f8e4aa726c528976b53f2c877f4991a3a8d28adb63bd751846ffb2350265e179d4990753ae8485ff9b4133ddad5875b84a90cbcfa62a045d726df71b6bda0eeca0be":"11111111aaaaaaaa11111111bbbbbbbb11111111cccccccc11111111dddddddd22222222aaaaaaaa22222222bbbbbbbb22222222cccccccc22222222dddddddd33333333aaaaaaaa33333333bbbbbbbb33333333cccccccc33333333dddddddd44444444aaaaaaaa44444444bbbbbbbb44444444cccccccc44444444dddddddd55555555aaaaaaaa55555555bbbbbbbb55555555cccccccc55555555dddddddd":0
+
+ARIA Selftest
+aria_selftest:
diff --git a/tests/suites/test_suite_dhm.data b/tests/suites/test_suite_dhm.data
index e351ebd..734fd97 100644
--- a/tests/suites/test_suite_dhm.data
+++ b/tests/suites/test_suite_dhm.data
@@ -19,10 +19,10 @@
 Diffie-Hellman zero modulus
 dhm_do_dhm:10:"0":10:"5":MBEDTLS_ERR_DHM_BAD_INPUT_DATA
 
-Diffie-Hallman load parameters from file
+Diffie-Hellman load parameters from file
 dhm_file:"data_files/dhparams.pem":"9e35f430443a09904f3a39a979797d070df53378e79c2438bef4e761f3c714553328589b041c809be1d6c6b5f1fc9f47d3a25443188253a992a56818b37ba9de5a40d362e56eff0be5417474c125c199272c8fe41dea733df6f662c92ae76556e755d10c64e6a50968f67fc6ea73d0dca8569be2ba204e23580d8bca2f4975b3":"02":128
 
-Diffie-Hallman load parameters from file
+Diffie-Hellman load parameters from file
 dhm_file:"data_files/dh.optlen.pem":"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":"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":256
 
 Diffie-Hellman selftest