diff --git a/.travis.yml b/.travis.yml
index ada8fc5..0ffe249 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -34,6 +34,10 @@
           packages:
           - clang-10
           - gnutls-bin
+      env:
+        # Platform tests have an allocation that returns null
+        - ASAN_OPTIONS="allocator_may_return_null=1"
+        - MSAN_OPTIONS="allocator_may_return_null=1"
       script:
         # Do a manual build+test sequence rather than using all.sh,
         # because there's no all.sh component that does what we want,
diff --git a/BRANCHES.md b/BRANCHES.md
index 6d2e5c0..f912e95 100644
--- a/BRANCHES.md
+++ b/BRANCHES.md
@@ -76,6 +76,6 @@
 - [`development`](https://github.com/Mbed-TLS/mbedtls/)
 - [`mbedtls-2.28`](https://github.com/Mbed-TLS/mbedtls/tree/mbedtls-2.28)
  maintained until at least the end of 2024, see
-  <https://github.com/Mbed-TLS/mbedtls/releases/tag/v2.28.3>.
+  <https://github.com/Mbed-TLS/mbedtls/releases/tag/v2.28.4>.
 
 Users are urged to always use the latest version of a maintained branch.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 30cef2f..52814ba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -223,7 +223,9 @@
 endif(CMAKE_COMPILER_IS_CLANG)
 
 if(CMAKE_COMPILER_IS_IAR)
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} --warn_about_c_style_casts -Ohz")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} --warn_about_c_style_casts")
+    set(CMAKE_C_FLAGS_RELEASE     "-Ohz")
+    set(CMAKE_C_FLAGS_DEBUG       "--debug -On")
 endif(CMAKE_COMPILER_IS_IAR)
 
 if(CMAKE_COMPILER_IS_MSVC)
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index a7bf198..8bbcdcb 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -84,8 +84,14 @@
 License and Copyright
 ---------------------
 
-All new files should include the [Apache-2.0](https://spdx.org/licenses/Apache-2.0.html) standard license header where possible. For licensing details, please see the [License section of the README](README.md#License).
+Unless specifically indicated otherwise in a file, Mbed TLS files are provided under the [Apache-2.0](https://spdx.org/licenses/Apache-2.0.html) license. See the [LICENSE](LICENSE) file for the full text of this license.
+
+Contributors must accept that their contributions are made under both the Apache-2.0 AND [GPL-2.0-or-later](https://spdx.org/licenses/GPL-2.0-or-later.html) licenses. This enables LTS (Long Term Support) branches of the software to be provided under either the Apache-2.0 or GPL-2.0-or-later licenses.
+
+All new files should include the [Apache-2.0](https://spdx.org/licenses/Apache-2.0.html) standard license header where possible.
 
 The copyright on contributions is retained by the original authors of the code. Where possible for new files, this should be noted in a comment at the top of the file in the form: "Copyright The Mbed TLS Contributors".
 
-When contributing code to us, the committer and all authors are required to make the submission under the terms of the [Developer Certificate of Origin](dco.txt), confirming that the code submitted can (legally) become part of the project, and be subject to the same Apache 2.0 license. This is done by including the standard Git `Signed-off-by:` line in every commit message. If more than one person contributed to the commit, they should also add their own `Signed-off-by:` line.
+When contributing code to us, the committer and all authors are required to make the submission under the terms of the [Developer Certificate of Origin](dco.txt), confirming that the code submitted can (legally) become part of the project, and is submitted under both the Apache-2.0 AND GPL-2.0-or-later licenses.
+
+This is done by including the standard Git `Signed-off-by:` line in every commit message. If more than one person contributed to the commit, they should also add their own `Signed-off-by:` line.
diff --git a/ChangeLog b/ChangeLog
index 4033839..c977a68 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,35 @@
 Mbed TLS ChangeLog (Sorted per branch, date)
 
+= Mbed TLS 2.28.4 branch released 2023-08-04
+
+Features
+   * Allow MBEDTLS_CONFIG_FILE and MBEDTLS_USER_CONFIG_FILE to be set by
+     setting the CMake variable of the same name at configuration time.
+
+Bugfix
+   * Fix crypt_and_hash decryption fail when used with a stream cipher
+     mode of operation, due to the input not being a multiple of the block
+     size. Resolves #7417.
+   * Fix a bug where mbedtls_x509_string_to_names() would return success
+     when given a invalid name string, if it did not contain '=' or ','.
+   * Fix missing PSA initialization in sample programs when
+     MBEDTLS_USE_PSA_CRYPTO is enabled.
+   * Fix clang and armclang compilation error when targeting certain Arm
+     M-class CPUs (Cortex-M0, Cortex-M0+, Cortex-M1, Cortex-M23,
+     SecurCore SC000). Fixes #1077.
+   * Fixed an issue that caused compile errors when using CMake and the IAR
+     toolchain.
+   * Fix the build with MBEDTLS_PSA_INJECT_ENTROPY. Fixes #7516.
+   * Fix builds on Windows with clang.
+   * Fix compilation warnings in aes.c for certain combinations
+     of configuration options.
+   * Fix a compilation error on some platforms when including mbedtls/ssl.h
+     with all TLS support disabled. Fixes #6628.
+
+Changes
+   * Update test data to avoid failures of unit tests after 2023-08-07, and
+     update expiring certififcates in the certs module.
+
 = Mbed TLS 2.28.3 branch released 2023-03-28
 
 Features
diff --git a/ChangeLog.d/00README.md b/ChangeLog.d/00README.md
index d2ea73d..2fbc989 100644
--- a/ChangeLog.d/00README.md
+++ b/ChangeLog.d/00README.md
@@ -21,6 +21,9 @@
 * Performance improvements, unless they are particularly significant.
 * Changes to parts of the code base that users don't interact with directly,
   such as test code and test data.
+* Fixes for compiler warnings. Releases typically contain a number of fixes
+  of this kind, so we will only mention them in the Changelog if they are
+  particularly significant.
 
 Until Mbed TLS 2.24.0, we required changelog entries in more cases.
 Looking at older changelog entries is good practice for how to write a
diff --git a/ChangeLog.d/armclang-compile-fix.txt b/ChangeLog.d/armclang-compile-fix.txt
deleted file mode 100644
index 93ad6af..0000000
--- a/ChangeLog.d/armclang-compile-fix.txt
+++ /dev/null
@@ -1,5 +0,0 @@
-Bugfix
-   * Fix clang and armclang compilation error when targeting certain Arm
-     M-class CPUs (Cortex-M0, Cortex-M0+, Cortex-M1, Cortex-M23,
-     SecurCore SC000). Fixes #1077.
-
diff --git a/ChangeLog.d/bugfix_iar_typo.txt b/ChangeLog.d/bugfix_iar_typo.txt
deleted file mode 100644
index 95f97b1..0000000
--- a/ChangeLog.d/bugfix_iar_typo.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-Bugfix
-   * Fixed an issue that caused compile errors when using CMake and the IAR
-     toolchain.
diff --git a/ChangeLog.d/cmake-pass-through-config-defines.txt b/ChangeLog.d/cmake-pass-through-config-defines.txt
deleted file mode 100644
index 6122f37..0000000
--- a/ChangeLog.d/cmake-pass-through-config-defines.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-Features
-   * Allow MBEDTLS_CONFIG_FILE and MBEDTLS_USER_CONFIG_FILE to be set by
-     setting the CMake variable of the same name at configuration time.
diff --git a/ChangeLog.d/fix-a-few-unchecked-return.txt b/ChangeLog.d/fix-a-few-unchecked-return.txt
new file mode 100644
index 0000000..aadde36
--- /dev/null
+++ b/ChangeLog.d/fix-a-few-unchecked-return.txt
@@ -0,0 +1,3 @@
+Bugfix
+   * Fix some cases where mbedtls_mpi_mod_exp, RSA key construction or ECDSA
+     signature can silently return an incorrect result in low memory conditions.
diff --git a/ChangeLog.d/fix-crypt_and_hash-decrypt-issue.txt b/ChangeLog.d/fix-crypt_and_hash-decrypt-issue.txt
deleted file mode 100644
index ded9b2d..0000000
--- a/ChangeLog.d/fix-crypt_and_hash-decrypt-issue.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-Bugfix
-   * Fix crypt_and_hash decryption fail when used with a stream cipher
-     mode of operation due to the input not being multiple of block size.
-     Resolves #7417.
diff --git a/ChangeLog.d/fix-string-to-names-retcode.txt b/ChangeLog.d/fix-string-to-names-retcode.txt
deleted file mode 100644
index ac4b3d1..0000000
--- a/ChangeLog.d/fix-string-to-names-retcode.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-Bugfix
-   * Fix a bug in which mbedtls_x509_string_to_names() would return success
-     when given a invalid name string if it did not contain '=' or ','.
diff --git a/ChangeLog.d/fix-tfm-build.txt b/ChangeLog.d/fix-tfm-build.txt
deleted file mode 100644
index a63bc2f..0000000
--- a/ChangeLog.d/fix-tfm-build.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-Bugfix
-   * Fix compilation warnings in aes.c for certain combinations
-     of configuration options.
diff --git a/ChangeLog.d/fix-win32-llvm-build.txt b/ChangeLog.d/fix-win32-llvm-build.txt
deleted file mode 100644
index 826551c..0000000
--- a/ChangeLog.d/fix-win32-llvm-build.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-Bugfix
-   * Fix builds on Windows with clang
diff --git a/ChangeLog.d/improve-doc-on-ecp-curve-optimized-representation.txt b/ChangeLog.d/improve-doc-on-ecp-curve-optimized-representation.txt
new file mode 100644
index 0000000..8fdc588
--- /dev/null
+++ b/ChangeLog.d/improve-doc-on-ecp-curve-optimized-representation.txt
@@ -0,0 +1,3 @@
+Features
+   * The documentation of mbedtls_ecp_group now describes the optimized
+     representation of A for some curves. Fixes #8045.
diff --git a/ChangeLog.d/inject-entropy.txt b/ChangeLog.d/inject-entropy.txt
deleted file mode 100644
index 7626629..0000000
--- a/ChangeLog.d/inject-entropy.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-Bugfix
-   * Fix the build with MBEDTLS_PSA_INJECT_ENTROPY. Fixes #7516.
diff --git a/ChangeLog.d/programs_psa_fix.txt b/ChangeLog.d/programs_psa_fix.txt
deleted file mode 100644
index fe2099e..0000000
--- a/ChangeLog.d/programs_psa_fix.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-Bugfix
-   * Fix missing PSA initialization in sample programs when
-     MBEDTLS_USE_PSA_CRYPTO is enabled.
diff --git a/ChangeLog.d/ssl_premaster_secret-empty.txt b/ChangeLog.d/ssl_premaster_secret-empty.txt
deleted file mode 100644
index 0ce5f36..0000000
--- a/ChangeLog.d/ssl_premaster_secret-empty.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-Bugfix
-   * Fix a compilation error on some platforms when including mbedtls/ssl.h
-     with all TLS support disabled. Fixes #6628.
diff --git a/ChangeLog.d/x509-ec-algorithm-identifier-fix.txt b/ChangeLog.d/x509-ec-algorithm-identifier-fix.txt
new file mode 100644
index 0000000..c1de491
--- /dev/null
+++ b/ChangeLog.d/x509-ec-algorithm-identifier-fix.txt
@@ -0,0 +1,4 @@
+Bugfix
+   * Fix x509 certificate generation to conform to RFC 5480 / RFC 5758 when
+     using ECC key. The certificate was rejected by some crypto frameworks.
+     Fixes #2924.
diff --git a/README.md b/README.md
index d5b6c12..875e6bf 100644
--- a/README.md
+++ b/README.md
@@ -249,7 +249,7 @@
 License
 -------
 
-Unless specifically indicated otherwise in a file, Mbed TLS files are provided under the [Apache-2.0](https://spdx.org/licenses/Apache-2.0.html) license. See the [LICENSE](LICENSE) file for the full text of this license. Contributors must accept that their contributions are made under both the Apache-2.0 AND [GPL-2.0-or-later](https://spdx.org/licenses/GPL-2.0-or-later.html) licenses. This enables LTS (Long Term Support) branches of the software to be provided under either the Apache-2.0 OR GPL-2.0-or-later licenses.
+Unless specifically indicated otherwise in a file, Mbed TLS files are provided under the [Apache-2.0](https://spdx.org/licenses/Apache-2.0.html) license. See the [LICENSE](LICENSE) file for the full text of this license, and [the 'License and Copyright' section in the contributing guidelines](CONTRIBUTING.md#License-and-Copyright) for more information.
 
 Contributing
 ------------
diff --git a/doxygen/input/doc_mainpage.h b/doxygen/input/doc_mainpage.h
index bbf4ea2..d19f93e 100644
--- a/doxygen/input/doc_mainpage.h
+++ b/doxygen/input/doc_mainpage.h
@@ -22,7 +22,7 @@
  */
 
 /**
- * @mainpage Mbed TLS v2.28.3 API Documentation
+ * @mainpage Mbed TLS v2.28.4 API Documentation
  *
  * This documentation describes the internal structure of Mbed TLS.  It was
  * automatically generated from specially formatted comment blocks in
diff --git a/doxygen/mbedtls.doxyfile b/doxygen/mbedtls.doxyfile
index 78299ed..0fc2da0 100644
--- a/doxygen/mbedtls.doxyfile
+++ b/doxygen/mbedtls.doxyfile
@@ -1,4 +1,4 @@
-PROJECT_NAME           = "mbed TLS v2.28.3"
+PROJECT_NAME           = "mbed TLS v2.28.4"
 OUTPUT_DIRECTORY       = ../apidoc/
 FULL_PATH_NAMES        = NO
 OPTIMIZE_OUTPUT_FOR_C  = YES
@@ -51,4 +51,5 @@
                          "MBEDTLS_CHECK_RETURN_TYPICAL="    \
                          "MBEDTLS_CHECK_RETURN_OPTIONAL="   \
                          "MBEDTLS_PRINTF_ATTRIBUTE(a,b)="   \
+                         "__DOXYGEN__"                      \
 
diff --git a/include/mbedtls/asn1write.h b/include/mbedtls/asn1write.h
index a439268..f453169 100644
--- a/include/mbedtls/asn1write.h
+++ b/include/mbedtls/asn1write.h
@@ -159,6 +159,27 @@
                                             size_t par_len);
 
 /**
+ * \brief           Write an AlgorithmIdentifier sequence in ASN.1 format.
+ *
+ * \note            This function works backwards in data buffer.
+ *
+ * \param p         The reference to the current position pointer.
+ * \param start     The start of the buffer, for bounds-checking.
+ * \param oid       The OID of the algorithm to write.
+ * \param oid_len   The length of the algorithm's OID.
+ * \param par_len   The length of the parameters, which must be already written.
+ * \param has_par   If there are any parameters. If 0, par_len must be 0. If 1
+ *                  and \p par_len is 0, NULL parameters are added.
+ *
+ * \return          The number of bytes written to \p p on success.
+ * \return          A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure.
+ */
+int mbedtls_asn1_write_algorithm_identifier_ext(unsigned char **p,
+                                                unsigned char *start,
+                                                const char *oid, size_t oid_len,
+                                                size_t par_len, int has_par);
+
+/**
  * \brief           Write a boolean tag (#MBEDTLS_ASN1_BOOLEAN) and value
  *                  in ASN.1 format.
  *
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 04acc1c..fa5ebd7 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -167,15 +167,47 @@
  * This allows different allocators (self-implemented or provided) to be
  * provided to the platform abstraction layer.
  *
- * Enabling MBEDTLS_PLATFORM_MEMORY without the
+ * Enabling #MBEDTLS_PLATFORM_MEMORY without the
  * MBEDTLS_PLATFORM_{FREE,CALLOC}_MACROs will provide
  * "mbedtls_platform_set_calloc_free()" allowing you to set an alternative calloc() and
  * free() function pointer at runtime.
  *
- * Enabling MBEDTLS_PLATFORM_MEMORY and specifying
+ * Enabling #MBEDTLS_PLATFORM_MEMORY and specifying
  * MBEDTLS_PLATFORM_{CALLOC,FREE}_MACROs will allow you to specify the
  * alternate function at compile time.
  *
+ * An overview of how the value of mbedtls_calloc is determined:
+ *
+ * - if !MBEDTLS_PLATFORM_MEMORY
+ *     - mbedtls_calloc = calloc
+ * - if MBEDTLS_PLATFORM_MEMORY
+ *     - if (MBEDTLS_PLATFORM_CALLOC_MACRO && MBEDTLS_PLATFORM_FREE_MACRO):
+ *         - mbedtls_calloc = MBEDTLS_PLATFORM_CALLOC_MACRO
+ *     - if !(MBEDTLS_PLATFORM_CALLOC_MACRO && MBEDTLS_PLATFORM_FREE_MACRO):
+ *         - Dynamic setup via mbedtls_platform_set_calloc_free is now possible with a default value MBEDTLS_PLATFORM_STD_CALLOC.
+ *         - How is MBEDTLS_PLATFORM_STD_CALLOC handled?
+ *         - if MBEDTLS_PLATFORM_NO_STD_FUNCTIONS:
+ *             - MBEDTLS_PLATFORM_STD_CALLOC is not set to anything;
+ *             - MBEDTLS_PLATFORM_STD_MEM_HDR can be included if present;
+ *         - if !MBEDTLS_PLATFORM_NO_STD_FUNCTIONS:
+ *             - if MBEDTLS_PLATFORM_STD_CALLOC is present:
+ *                 - User-defined MBEDTLS_PLATFORM_STD_CALLOC is respected;
+ *             - if !MBEDTLS_PLATFORM_STD_CALLOC:
+ *                 - MBEDTLS_PLATFORM_STD_CALLOC = calloc
+ *
+ *         - At this point the presence of MBEDTLS_PLATFORM_STD_CALLOC is checked.
+ *         - if !MBEDTLS_PLATFORM_STD_CALLOC
+ *             - MBEDTLS_PLATFORM_STD_CALLOC = uninitialized_calloc
+ *
+ *         - mbedtls_calloc = MBEDTLS_PLATFORM_STD_CALLOC.
+ *
+ * Defining MBEDTLS_PLATFORM_CALLOC_MACRO and #MBEDTLS_PLATFORM_STD_CALLOC at the same time is not possible.
+ * MBEDTLS_PLATFORM_CALLOC_MACRO and MBEDTLS_PLATFORM_FREE_MACRO must both be defined or undefined at the same time.
+ * #MBEDTLS_PLATFORM_STD_CALLOC and #MBEDTLS_PLATFORM_STD_FREE do not have to be defined at the same time, as, if they are used,
+ * dynamic setup of these functions is possible. See the tree above to see how are they handled in all cases.
+ * An uninitialized #MBEDTLS_PLATFORM_STD_CALLOC always fails, returning a null pointer.
+ * An uninitialized #MBEDTLS_PLATFORM_STD_FREE does not do anything.
+ *
  * Requires: MBEDTLS_PLATFORM_C
  *
  * Enable this layer to allow use of alternative memory allocators.
@@ -3798,8 +3830,29 @@
 
 /* Platform options */
 //#define MBEDTLS_PLATFORM_STD_MEM_HDR   <stdlib.h> /**< Header to include if MBEDTLS_PLATFORM_NO_STD_FUNCTIONS is defined. Don't define if no header is needed. */
-//#define MBEDTLS_PLATFORM_STD_CALLOC        calloc /**< Default allocator to use, can be undefined */
-//#define MBEDTLS_PLATFORM_STD_FREE            free /**< Default free to use, can be undefined */
+
+/** \def MBEDTLS_PLATFORM_STD_CALLOC
+ *
+ * Default allocator to use, can be undefined.
+ * It must initialize the allocated buffer memory to zeroes.
+ * The size of the buffer is the product of the two parameters.
+ * The calloc function returns either a null pointer or a pointer to the allocated space.
+ * If the product is 0, the function may either return NULL or a valid pointer to an array of size 0 which is a valid input to the deallocation function.
+ * An uninitialized #MBEDTLS_PLATFORM_STD_CALLOC always fails, returning a null pointer.
+ * See the description of #MBEDTLS_PLATFORM_MEMORY for more details.
+ * The corresponding deallocation function is #MBEDTLS_PLATFORM_STD_FREE.
+ */
+//#define MBEDTLS_PLATFORM_STD_CALLOC        calloc
+
+/** \def MBEDTLS_PLATFORM_STD_FREE
+ *
+ * Default free to use, can be undefined.
+ * NULL is a valid parameter, and the function must do nothing.
+ * A non-null parameter will always be a pointer previously returned by #MBEDTLS_PLATFORM_STD_CALLOC and not yet freed.
+ * An uninitialized #MBEDTLS_PLATFORM_STD_FREE does not do anything.
+ * See the description of #MBEDTLS_PLATFORM_MEMORY for more details (same principles as for MBEDTLS_PLATFORM_STD_CALLOC apply).
+ */
+//#define MBEDTLS_PLATFORM_STD_FREE            free
 //#define MBEDTLS_PLATFORM_STD_EXIT            exit /**< Default exit to use, can be undefined */
 //#define MBEDTLS_PLATFORM_STD_TIME            time /**< Default time to use, can be undefined. MBEDTLS_HAVE_TIME must be enabled */
 //#define MBEDTLS_PLATFORM_STD_FPRINTF      fprintf /**< Default fprintf to use, can be undefined */
@@ -3812,10 +3865,10 @@
 //#define MBEDTLS_PLATFORM_STD_NV_SEED_WRITE  mbedtls_platform_std_nv_seed_write /**< Default nv_seed_write function to use, can be undefined */
 //#define MBEDTLS_PLATFORM_STD_NV_SEED_FILE  "seedfile" /**< Seed file to read/write with default implementation */
 
-/* To Use Function Macros MBEDTLS_PLATFORM_C must be enabled */
+/* To use the following function macros, MBEDTLS_PLATFORM_C must be enabled. */
 /* MBEDTLS_PLATFORM_XXX_MACRO and MBEDTLS_PLATFORM_XXX_ALT cannot both be defined */
-//#define MBEDTLS_PLATFORM_CALLOC_MACRO        calloc /**< Default allocator macro to use, can be undefined */
-//#define MBEDTLS_PLATFORM_FREE_MACRO            free /**< Default free macro to use, can be undefined */
+//#define MBEDTLS_PLATFORM_CALLOC_MACRO        calloc /**< Default allocator macro to use, can be undefined. See MBEDTLS_PLATFORM_STD_CALLOC for requirements. */
+//#define MBEDTLS_PLATFORM_FREE_MACRO            free /**< Default free macro to use, can be undefined. See MBEDTLS_PLATFORM_STD_FREE for requirements. */
 //#define MBEDTLS_PLATFORM_EXIT_MACRO            exit /**< Default exit macro to use, can be undefined */
 //#define MBEDTLS_PLATFORM_TIME_MACRO            time /**< Default time macro to use, can be undefined. MBEDTLS_HAVE_TIME must be enabled */
 //#define MBEDTLS_PLATFORM_TIME_TYPE_MACRO       time_t /**< Default time macro to use, can be undefined. MBEDTLS_HAVE_TIME must be enabled */
diff --git a/include/mbedtls/ecp.h b/include/mbedtls/ecp.h
index d56069e..23ebe9b 100644
--- a/include/mbedtls/ecp.h
+++ b/include/mbedtls/ecp.h
@@ -42,6 +42,11 @@
 
 #include "mbedtls/bignum.h"
 
+#if (defined(__ARMCC_VERSION) || defined(_MSC_VER)) && \
+    !defined(inline) && !defined(__cplusplus)
+#define inline __inline
+#endif
+
 /*
  * ECP error codes
  */
@@ -236,6 +241,27 @@
  * odd prime as mbedtls_ecp_mul() requires an odd number, and
  * mbedtls_ecdsa_sign() requires that it is prime for blinding purposes.
  *
+ * The default implementation only initializes \p A without setting it to the
+ * authentic value for curves with <code>A = -3</code>(SECP256R1, etc), in which
+ * case you need to load \p A by yourself when using domain parameters directly,
+ * for example:
+ * \code
+ * mbedtls_mpi_init(&A);
+ * mbedtls_ecp_group_init(&grp);
+ * CHECK_RETURN(mbedtls_ecp_group_load(&grp, grp_id));
+ * if (mbedtls_ecp_group_a_is_minus_3(&grp)) {
+ *     CHECK_RETURN(mbedtls_mpi_sub_int(&A, &grp.P, 3));
+ * } else {
+ *     CHECK_RETURN(mbedtls_mpi_copy(&A, &grp.A));
+ * }
+ *
+ * do_something_with_a(&A);
+ *
+ * cleanup:
+ * mbedtls_mpi_free(&A);
+ * mbedtls_ecp_group_free(&grp);
+ * \endcode
+ *
  * For Montgomery curves, we do not store \p A, but <code>(A + 2) / 4</code>,
  * which is the quantity used in the formulas. Additionally, \p nbits is
  * not the size of \p N but the required size for private keys.
@@ -256,8 +282,11 @@
 typedef struct mbedtls_ecp_group {
     mbedtls_ecp_group_id id;    /*!< An internal group identifier. */
     mbedtls_mpi P;              /*!< The prime modulus of the base field. */
-    mbedtls_mpi A;              /*!< For Short Weierstrass: \p A in the equation. For
-                                     Montgomery curves: <code>(A + 2) / 4</code>. */
+    mbedtls_mpi A;              /*!< For Short Weierstrass: \p A in the equation. Note that
+                                     \p A is not set to the authentic value in some cases.
+                                     Refer to detailed description of ::mbedtls_ecp_group if
+                                     using domain parameters in the structure.
+                                     For Montgomery curves: <code>(A + 2) / 4</code>. */
     mbedtls_mpi B;              /*!< For Short Weierstrass: \p B in the equation.
                                      For Montgomery curves: unused. */
     mbedtls_ecp_point G;        /*!< The generator of the subgroup used. */
@@ -990,6 +1019,26 @@
 
 #if defined(MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED)
 /**
+ * \brief           This function checks if domain parameter A of the curve is
+ *                  \c -3.
+ *
+ * \note            This function is only defined for short Weierstrass curves.
+ *                  It may not be included in builds without any short
+ *                  Weierstrass curve.
+ *
+ * \param grp       The ECP group to use.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
+ *
+ * \return          \c 1 if <code>A = -3</code>.
+ * \return          \c 0 Otherwise.
+ */
+static inline int mbedtls_ecp_group_a_is_minus_3(const mbedtls_ecp_group *grp)
+{
+    return grp->A.p == NULL;
+}
+
+/**
  * \brief           This function performs multiplication and addition of two
  *                  points by integers: \p R = \p m * \p P + \p n * \p Q
  *
diff --git a/include/mbedtls/net_sockets.h b/include/mbedtls/net_sockets.h
index c8bcde0..6bcd920 100644
--- a/include/mbedtls/net_sockets.h
+++ b/include/mbedtls/net_sockets.h
@@ -283,6 +283,10 @@
  * \brief          Closes down the connection and free associated data
  *
  * \param ctx      The context to close
+ *
+ * \note           This function frees and clears data associated with the
+ *                 context but does not free the memory pointed to by \p ctx.
+ *                 This memory is the responsibility of the caller.
  */
 void mbedtls_net_close(mbedtls_net_context *ctx);
 
@@ -290,6 +294,10 @@
  * \brief          Gracefully shutdown the connection and free associated data
  *
  * \param ctx      The context to free
+ *
+ * \note           This function frees and clears data associated with the
+ *                 context but does not free the memory pointed to by \p ctx.
+ *                 This memory is the responsibility of the caller.
  */
 void mbedtls_net_free(mbedtls_net_context *ctx);
 
diff --git a/include/mbedtls/platform.h b/include/mbedtls/platform.h
index d6faa7e..c8c6e63 100644
--- a/include/mbedtls/platform.h
+++ b/include/mbedtls/platform.h
@@ -135,11 +135,22 @@
 #endif
 #endif /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */
 
+/* Enable certain documented defines only when generating doxygen to avoid
+ * an "unrecognized define" error. */
+#if defined(__DOXYGEN__) && !defined(MBEDTLS_PLATFORM_STD_CALLOC)
+#define MBEDTLS_PLATFORM_STD_CALLOC
+#endif
+
+#if defined(__DOXYGEN__) && !defined(MBEDTLS_PLATFORM_STD_FREE)
+#define MBEDTLS_PLATFORM_STD_FREE
+#endif
 
 /** \} name SECTION: Module settings */
 
 /*
  * The function pointers for calloc and free.
+ * Please see MBEDTLS_PLATFORM_STD_CALLOC and MBEDTLS_PLATFORM_STD_FREE
+ * in mbedtls_config.h for more information about behaviour and requirements.
  */
 #if defined(MBEDTLS_PLATFORM_MEMORY)
 #if defined(MBEDTLS_PLATFORM_FREE_MACRO) && \
diff --git a/include/mbedtls/version.h b/include/mbedtls/version.h
index 0ef5213..1ae06e6 100644
--- a/include/mbedtls/version.h
+++ b/include/mbedtls/version.h
@@ -38,16 +38,16 @@
  */
 #define MBEDTLS_VERSION_MAJOR  2
 #define MBEDTLS_VERSION_MINOR  28
-#define MBEDTLS_VERSION_PATCH  3
+#define MBEDTLS_VERSION_PATCH  4
 
 /**
  * The single version number has the following structure:
  *    MMNNPP00
  *    Major version | Minor version | Patch version
  */
-#define MBEDTLS_VERSION_NUMBER         0x021C0300
-#define MBEDTLS_VERSION_STRING         "2.28.3"
-#define MBEDTLS_VERSION_STRING_FULL    "mbed TLS 2.28.3"
+#define MBEDTLS_VERSION_NUMBER         0x021C0400
+#define MBEDTLS_VERSION_STRING         "2.28.4"
+#define MBEDTLS_VERSION_STRING_FULL    "mbed TLS 2.28.4"
 
 #if defined(MBEDTLS_VERSION_C)
 
diff --git a/include/mbedtls/x509.h b/include/mbedtls/x509.h
index 8fd321a..f00f3a6 100644
--- a/include/mbedtls/x509.h
+++ b/include/mbedtls/x509.h
@@ -361,7 +361,8 @@
                              mbedtls_asn1_named_data *first);
 int mbedtls_x509_write_sig(unsigned char **p, unsigned char *start,
                            const char *oid, size_t oid_len,
-                           unsigned char *sig, size_t size);
+                           unsigned char *sig, size_t size,
+                           mbedtls_pk_type_t pk_alg);
 
 #define MBEDTLS_X509_SAFE_SNPRINTF                          \
     do {                                                    \
diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index a159251..147caaf 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -204,15 +204,15 @@
 if(USE_SHARED_MBEDTLS_LIBRARY)
     set(CMAKE_LIBRARY_PATH ${CMAKE_CURRENT_BINARY_DIR})
     add_library(${mbedcrypto_target} SHARED ${src_crypto})
-    set_target_properties(${mbedcrypto_target} PROPERTIES VERSION 2.28.3 SOVERSION 7)
+    set_target_properties(${mbedcrypto_target} PROPERTIES VERSION 2.28.4 SOVERSION 7)
     target_link_libraries(${mbedcrypto_target} PUBLIC ${libs})
 
     add_library(${mbedx509_target} SHARED ${src_x509})
-    set_target_properties(${mbedx509_target} PROPERTIES VERSION 2.28.3 SOVERSION 1)
+    set_target_properties(${mbedx509_target} PROPERTIES VERSION 2.28.4 SOVERSION 1)
     target_link_libraries(${mbedx509_target} PUBLIC ${libs} ${mbedcrypto_target})
 
     add_library(${mbedtls_target} SHARED ${src_tls})
-    set_target_properties(${mbedtls_target} PROPERTIES VERSION 2.28.3 SOVERSION 14)
+    set_target_properties(${mbedtls_target} PROPERTIES VERSION 2.28.4 SOVERSION 14)
     target_link_libraries(${mbedtls_target} PUBLIC ${libs} ${mbedx509_target})
 endif(USE_SHARED_MBEDTLS_LIBRARY)
 
diff --git a/library/aes.c b/library/aes.c
index c506709..d5a45fd 100644
--- a/library/aes.c
+++ b/library/aes.c
@@ -19,7 +19,7 @@
 /*
  *  The AES block cipher was designed by Vincent Rijmen and Joan Daemen.
  *
- *  http://csrc.nist.gov/encryption/aes/rijndael/Rijndael.pdf
+ *  https://csrc.nist.gov/csrc/media/projects/cryptographic-standards-and-guidelines/documents/aes-development/rijndael-ammended.pdf
  *  http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
  */
 
diff --git a/library/asn1write.c b/library/asn1write.c
index 0b487dc..a499bea 100644
--- a/library/asn1write.c
+++ b/library/asn1write.c
@@ -195,13 +195,22 @@
                                             const char *oid, size_t oid_len,
                                             size_t par_len)
 {
+    return mbedtls_asn1_write_algorithm_identifier_ext(p, start, oid, oid_len, par_len, 1);
+}
+
+int mbedtls_asn1_write_algorithm_identifier_ext(unsigned char **p, unsigned char *start,
+                                                const char *oid, size_t oid_len,
+                                                size_t par_len, int has_par)
+{
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     size_t len = 0;
 
-    if (par_len == 0) {
-        MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_null(p, start));
-    } else {
-        len += par_len;
+    if (has_par) {
+        if (par_len == 0) {
+            MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_null(p, start));
+        } else {
+            len += par_len;
+        }
     }
 
     MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_oid(p, start, oid, oid_len));
diff --git a/library/bignum.c b/library/bignum.c
index 5dca3a9..384b924 100644
--- a/library/bignum.c
+++ b/library/bignum.c
@@ -2121,8 +2121,9 @@
      * and squarings. Firstly, when multiplying by an element of the window
      * W[i], we do a constant-trace table lookup to obfuscate i. This leaves
      * squarings as having a different memory access patterns from other
-     * multiplications. So secondly, we put the accumulator X in the table as
-     * well, and also do a constant-trace table lookup to multiply by X.
+     * multiplications. So secondly, we put the accumulator in the table as
+     * well, and also do a constant-trace table lookup to multiply by the
+     * accumulator which is W[x_index].
      *
      * This way, all multiplications take the form of a lookup-and-multiply.
      * The number of lookup-and-multiply operations inside each iteration of
@@ -2135,19 +2136,16 @@
      * observe both memory accesses and branches. However, branch prediction
      * exploitation typically requires many traces of execution over the same
      * data, which is defeated by randomized blinding.
-     *
-     * To achieve this, we make a copy of X and we use the table entry in each
-     * calculation from this point on.
      */
     const size_t x_index = 0;
     mbedtls_mpi_init(&W[x_index]);
-    mbedtls_mpi_copy(&W[x_index], X);
 
     j = N->n + 1;
-    /* All W[i] and X must have at least N->n limbs for the mpi_montmul()
-     * and mpi_montred() calls later. Here we ensure that W[1] and X are
-     * large enough, and later we'll grow other W[i] to the same length.
-     * They must not be shrunk midway through this function!
+    /* All W[i] including the accumulator must have at least N->n limbs for
+     * the mpi_montmul() and mpi_montred() calls later. Here we ensure that
+     * W[1] and the accumulator W[x_index] are large enough. later we'll grow
+     * other W[i] to the same length. They must not be shrunk midway through
+     * this function!
      */
     MBEDTLS_MPI_CHK(mbedtls_mpi_grow(&W[x_index], j));
     MBEDTLS_MPI_CHK(mbedtls_mpi_grow(&W[1],  j));
@@ -2328,7 +2326,7 @@
     /*
      * Load the result in the output variable.
      */
-    mbedtls_mpi_copy(X, &W[x_index]);
+    MBEDTLS_MPI_CHK(mbedtls_mpi_copy(X, &W[x_index]));
 
 cleanup:
 
diff --git a/library/ctr_drbg.c b/library/ctr_drbg.c
index 45d9254..6f553dc 100644
--- a/library/ctr_drbg.c
+++ b/library/ctr_drbg.c
@@ -19,7 +19,7 @@
 /*
  *  The NIST SP 800-90 DRBGs are described in the following publication.
  *
- *  http://csrc.nist.gov/publications/nistpubs/800-90/SP800-90revised_March2007.pdf
+ *  https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-90r.pdf
  */
 
 #include "common.h"
diff --git a/library/ecdsa.c b/library/ecdsa.c
index 1f0b37d..3ede933 100644
--- a/library/ecdsa.c
+++ b/library/ecdsa.c
@@ -366,7 +366,7 @@
 
 #if defined(MBEDTLS_ECP_RESTARTABLE)
     if (rs_ctx != NULL && rs_ctx->sig != NULL) {
-        mbedtls_mpi_copy(r, pr);
+        MBEDTLS_MPI_CHK(mbedtls_mpi_copy(r, pr));
     }
 #endif
 
@@ -457,7 +457,7 @@
     MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary(d, data, grp_len));
     MBEDTLS_MPI_CHK(derive_mpi(grp, &h, buf, blen));
     MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary(&h, data + grp_len, grp_len));
-    mbedtls_hmac_drbg_seed_buf(p_rng, md_info, data, 2 * grp_len);
+    MBEDTLS_MPI_CHK(mbedtls_hmac_drbg_seed_buf(p_rng, md_info, data, 2 * grp_len));
 
 #if defined(MBEDTLS_ECP_RESTARTABLE)
     if (rs_ctx != NULL && rs_ctx->det != NULL) {
diff --git a/library/ecp.c b/library/ecp.c
index 2d80b6f..dc8e279 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -166,7 +166,7 @@
     unsigned char secret_bytes[MBEDTLS_ECP_MAX_BYTES];
     /* The list starts with strong hashes */
     const mbedtls_md_type_t md_type =
-        (const mbedtls_md_type_t) (mbedtls_md_list()[0]);
+        (mbedtls_md_type_t) (mbedtls_md_list()[0]);
     const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type(md_type);
 
     if (secret_len > MBEDTLS_ECP_MAX_BYTES) {
@@ -2593,6 +2593,7 @@
                        void *p_rng)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    int have_rng = 1;
     size_t i;
     unsigned char b;
     mbedtls_ecp_point RP;
@@ -2625,9 +2626,8 @@
     /* RP.X might be slightly larger than P, so reduce it */
     MOD_ADD(RP.X);
 
-    /* Randomize coordinates of the starting point */
-    int have_rng = 1;
 #if defined(MBEDTLS_ECP_NO_INTERNAL_RNG)
+    /* Derandomize coordinates of the starting point */
     if (f_rng == NULL) {
         have_rng = 0;
     }
diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index fdcdd43..fade286 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -1472,6 +1472,7 @@
 {
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
     psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
+    psa_key_attributes_t attributes;
     psa_key_slot_t *slot;
 
     /* Reject a zero-length output buffer now, since this can never be a
@@ -1498,7 +1499,7 @@
         goto exit;
     }
 
-    psa_key_attributes_t attributes = {
+    attributes = (psa_key_attributes_t) {
         .core = slot->attr
     };
     status = psa_driver_wrapper_export_public_key(
@@ -2406,6 +2407,7 @@
 {
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
     psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
+    psa_key_attributes_t attributes;
     psa_key_slot_t *slot = NULL;
 
     /* A context must be freshly initialized before it can be set up. */
@@ -2423,7 +2425,7 @@
         goto exit;
     }
 
-    psa_key_attributes_t attributes = {
+    attributes = (psa_key_attributes_t) {
         .core = slot->attr
     };
 
@@ -2594,6 +2596,7 @@
 {
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
     psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
+    psa_key_attributes_t attributes;
     psa_key_slot_t *slot;
     uint8_t operation_mac_size = 0;
 
@@ -2606,7 +2609,7 @@
         goto exit;
     }
 
-    psa_key_attributes_t attributes = {
+    attributes = (psa_key_attributes_t) {
         .core = slot->attr
     };
 
@@ -2732,6 +2735,7 @@
 {
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
     psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
+    psa_key_attributes_t attributes;
     psa_key_slot_t *slot;
 
     *signature_length = 0;
@@ -2764,7 +2768,7 @@
         goto exit;
     }
 
-    psa_key_attributes_t attributes = {
+    attributes = (psa_key_attributes_t)  {
         .core = slot->attr
     };
 
@@ -3303,6 +3307,7 @@
 {
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
     psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
+    psa_key_attributes_t attributes;
     psa_key_slot_t *slot = NULL;
     psa_key_usage_t usage = (cipher_operation == MBEDTLS_ENCRYPT ?
                              PSA_KEY_USAGE_ENCRYPT :
@@ -3338,7 +3343,7 @@
     }
     operation->default_iv_length = PSA_CIPHER_IV_LENGTH(slot->attr.type, alg);
 
-    psa_key_attributes_t attributes = {
+    attributes = (psa_key_attributes_t) {
         .core = slot->attr
     };
 
@@ -3561,6 +3566,7 @@
 {
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
     psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
+    psa_key_attributes_t attributes;
     psa_key_slot_t *slot = NULL;
     uint8_t local_iv[PSA_CIPHER_IV_MAX_SIZE];
     size_t default_iv_length = 0;
@@ -3577,7 +3583,7 @@
         goto exit;
     }
 
-    psa_key_attributes_t attributes = {
+    attributes = (psa_key_attributes_t) {
         .core = slot->attr
     };
 
@@ -3633,6 +3639,7 @@
 {
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
     psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
+    psa_key_attributes_t attributes;
     psa_key_slot_t *slot = NULL;
 
     if (!PSA_ALG_IS_CIPHER(alg)) {
@@ -3647,7 +3654,7 @@
         goto exit;
     }
 
-    psa_key_attributes_t attributes = {
+    attributes = (psa_key_attributes_t) {
         .core = slot->attr
     };
 
@@ -4251,6 +4258,7 @@
     uint8_t *data = NULL;
     size_t bytes = PSA_BITS_TO_BYTES(bits);
     psa_status_t status;
+    psa_key_attributes_t attributes;
 
     if (!key_type_is_raw_bytes(slot->attr.type)) {
         return PSA_ERROR_INVALID_ARGUMENT;
@@ -4279,7 +4287,7 @@
     }
 
     slot->attr.bits = (psa_key_bits_t) bits;
-    psa_key_attributes_t attributes = {
+    attributes = (psa_key_attributes_t) {
         .core = slot->attr
     };
 
@@ -4891,14 +4899,16 @@
                                                    size_t shared_secret_size,
                                                    size_t *shared_secret_length)
 {
+    mbedtls_ecp_keypair *ecp = NULL;
+    psa_status_t status;
+
     switch (alg) {
 #if defined(MBEDTLS_PSA_BUILTIN_ALG_ECDH)
         case PSA_ALG_ECDH:
             if (!PSA_KEY_TYPE_IS_ECC_KEY_PAIR(private_key->attr.type)) {
                 return PSA_ERROR_INVALID_ARGUMENT;
             }
-            mbedtls_ecp_keypair *ecp = NULL;
-            psa_status_t status = mbedtls_psa_ecp_load_representation(
+            status = mbedtls_psa_ecp_load_representation(
                 private_key->attr.type,
                 private_key->attr.bits,
                 private_key->key.data,
@@ -4916,6 +4926,8 @@
             return status;
 #endif /* MBEDTLS_PSA_BUILTIN_ALG_ECDH */
         default:
+            (void) ecp;
+            (void) status;
             (void) private_key;
             (void) peer_key;
             (void) peer_key_length;
@@ -5011,6 +5023,7 @@
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
     psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
     psa_key_slot_t *slot = NULL;
+    size_t expected_length;
 
     if (!PSA_ALG_IS_KEY_AGREEMENT(alg)) {
         status = PSA_ERROR_INVALID_ARGUMENT;
@@ -5030,7 +5043,7 @@
      * PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE() is exact so the point is moot.
      * If FFDH is implemented, PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE() can easily
      * be exact for it as well. */
-    size_t expected_length =
+    expected_length =
         PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE(slot->attr.type, slot->attr.bits);
     if (output_size < expected_length) {
         status = PSA_ERROR_BUFFER_TOO_SMALL;
diff --git a/library/psa_crypto_storage.h b/library/psa_crypto_storage.h
index 04768f8..edd9b94 100644
--- a/library/psa_crypto_storage.h
+++ b/library/psa_crypto_storage.h
@@ -39,7 +39,7 @@
 /* Sanity check: a file size must fit in 32 bits. Allow a generous
  * 64kB of metadata. */
 #if PSA_CRYPTO_MAX_STORAGE_SIZE > 0xffff0000
-#error PSA_CRYPTO_MAX_STORAGE_SIZE > 0xffff0000
+#error "PSA_CRYPTO_MAX_STORAGE_SIZE > 0xffff0000"
 #endif
 
 /** The maximum permitted persistent slot number.
diff --git a/library/rsa_internal.c b/library/rsa_internal.c
index 2ff51c3..41ceff0 100644
--- a/library/rsa_internal.c
+++ b/library/rsa_internal.c
@@ -126,7 +126,7 @@
     }
 
     for (; attempt < num_primes; ++attempt) {
-        mbedtls_mpi_lset(&K, primes[attempt]);
+        MBEDTLS_MPI_CHK(mbedtls_mpi_lset(&K, primes[attempt]));
 
         /* Check if gcd(K,N) = 1 */
         MBEDTLS_MPI_CHK(mbedtls_mpi_gcd(P, &K, N));
diff --git a/library/x509_create.c b/library/x509_create.c
index cdfc82a..bd772d3 100644
--- a/library/x509_create.c
+++ b/library/x509_create.c
@@ -285,9 +285,11 @@
 
 int mbedtls_x509_write_sig(unsigned char **p, unsigned char *start,
                            const char *oid, size_t oid_len,
-                           unsigned char *sig, size_t size)
+                           unsigned char *sig, size_t size,
+                           mbedtls_pk_type_t pk_alg)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    int write_null_par;
     size_t len = 0;
 
     if (*p < start || (size_t) (*p - start) < size) {
@@ -310,8 +312,19 @@
 
     // Write OID
     //
-    MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_algorithm_identifier(p, start, oid,
-                                                                      oid_len, 0));
+    if (pk_alg == MBEDTLS_PK_ECDSA) {
+        /*
+         * The AlgorithmIdentifier's parameters field must be absent for DSA/ECDSA signature
+         * algorithms, see https://www.rfc-editor.org/rfc/rfc5480#page-17 and
+         * https://www.rfc-editor.org/rfc/rfc5758#section-3.
+         */
+        write_null_par = 0;
+    } else {
+        write_null_par = 1;
+    }
+    MBEDTLS_ASN1_CHK_ADD(len,
+                         mbedtls_asn1_write_algorithm_identifier_ext(p, start, oid, oid_len,
+                                                                     0, write_null_par));
 
     return (int) len;
 }
diff --git a/library/x509write_crt.c b/library/x509write_crt.c
index a8f4c28..e994411 100644
--- a/library/x509write_crt.c
+++ b/library/x509write_crt.c
@@ -342,6 +342,7 @@
     size_t sub_len = 0, pub_len = 0, sig_and_oid_len = 0, sig_len;
     size_t len = 0;
     mbedtls_pk_type_t pk_alg;
+    int write_sig_null_par;
 
     /*
      * Prepare data to be signed at the end of the target buffer
@@ -433,9 +434,20 @@
     /*
      *  Signature   ::=  AlgorithmIdentifier
      */
+    if (pk_alg == MBEDTLS_PK_ECDSA) {
+        /*
+         * The AlgorithmIdentifier's parameters field must be absent for DSA/ECDSA signature
+         * algorithms, see https://www.rfc-editor.org/rfc/rfc5480#page-17 and
+         * https://www.rfc-editor.org/rfc/rfc5758#section-3.
+         */
+        write_sig_null_par = 0;
+    } else {
+        write_sig_null_par = 1;
+    }
     MBEDTLS_ASN1_CHK_ADD(len,
-                         mbedtls_asn1_write_algorithm_identifier(&c, buf,
-                                                                 sig_oid, strlen(sig_oid), 0));
+                         mbedtls_asn1_write_algorithm_identifier_ext(&c, buf,
+                                                                     sig_oid, strlen(sig_oid),
+                                                                     0, write_sig_null_par));
 
     /*
      *  Serial   ::=  INTEGER
@@ -492,8 +504,8 @@
      * into the CRT buffer. */
     c2 = buf + size;
     MBEDTLS_ASN1_CHK_ADD(sig_and_oid_len, mbedtls_x509_write_sig(&c2, c,
-                                                                 sig_oid, sig_oid_len, sig,
-                                                                 sig_len));
+                                                                 sig_oid, sig_oid_len,
+                                                                 sig, sig_len, pk_alg));
 
     /*
      * Memory layout after this step:
diff --git a/library/x509write_csr.c b/library/x509write_csr.c
index a421fde..178b166 100644
--- a/library/x509write_csr.c
+++ b/library/x509write_csr.c
@@ -265,7 +265,7 @@
     c2 = buf + size;
     MBEDTLS_ASN1_CHK_ADD(sig_and_oid_len,
                          mbedtls_x509_write_sig(&c2, buf + len, sig_oid, sig_oid_len,
-                                                sig, sig_len));
+                                                sig, sig_len, pk_alg));
 
     /*
      * Compact the space between the CSR data and signature by moving the
diff --git a/programs/fuzz/common.c b/programs/fuzz/common.c
index 56b9a13..96a24f7 100644
--- a/programs/fuzz/common.c
+++ b/programs/fuzz/common.c
@@ -13,7 +13,7 @@
 }
 #endif
 
-void dummy_init()
+void dummy_init(void)
 {
 #if defined(MBEDTLS_PLATFORM_TIME_ALT)
     mbedtls_platform_set_time(dummy_constant_time);
diff --git a/programs/fuzz/common.h b/programs/fuzz/common.h
index 6b5b515..d5b098f 100644
--- a/programs/fuzz/common.h
+++ b/programs/fuzz/common.h
@@ -19,7 +19,7 @@
 #if defined(MBEDTLS_HAVE_TIME)
 mbedtls_time_t dummy_constant_time(mbedtls_time_t *time);
 #endif
-void dummy_init();
+void dummy_init(void);
 
 int dummy_send(void *ctx, const unsigned char *buf, size_t len);
 int fuzz_recv(void *ctx, unsigned char *buf, size_t len);
diff --git a/programs/ssl/ssl_context_info.c b/programs/ssl/ssl_context_info.c
index d503fab..ebdef4f 100644
--- a/programs/ssl/ssl_context_info.c
+++ b/programs/ssl/ssl_context_info.c
@@ -128,12 +128,12 @@
 /*
  * Basic printing functions
  */
-void print_version()
+void print_version(void)
 {
     printf("%s v%d.%d\n", PROG_NAME, VER_MAJOR, VER_MINOR);
 }
 
-void print_usage()
+void print_usage(void)
 {
     print_version();
     printf("\nThis program is used to deserialize an Mbed TLS SSL session from the base64 code provided\n"
@@ -182,7 +182,7 @@
 /*
  * Exit from the program in case of error
  */
-void error_exit()
+void error_exit(void)
 {
     if (NULL != b64_file) {
         fclose(b64_file);
diff --git a/programs/test/selftest.c b/programs/test/selftest.c
index 229f0d8..f45eb85 100644
--- a/programs/test/selftest.c
+++ b/programs/test/selftest.c
@@ -77,23 +77,51 @@
     void *empty2 = mbedtls_calloc(0, 1);
     void *buffer1 = mbedtls_calloc(1, 1);
     void *buffer2 = mbedtls_calloc(1, 1);
+    unsigned int buffer_3_size = 256;
+    unsigned int buffer_4_size = 4097; /* Allocate more than the usual page size */
+    unsigned char *buffer3 = mbedtls_calloc(buffer_3_size, 1);
+    unsigned char *buffer4 = mbedtls_calloc(buffer_4_size, 1);
 
     if (empty1 == NULL && empty2 == NULL) {
         if (verbose) {
-            mbedtls_printf("  CALLOC(0): passed (NULL)\n");
+            mbedtls_printf("  CALLOC(0,1): passed (NULL)\n");
         }
     } else if (empty1 == NULL || empty2 == NULL) {
         if (verbose) {
-            mbedtls_printf("  CALLOC(0): failed (mix of NULL and non-NULL)\n");
+            mbedtls_printf("  CALLOC(0,1): failed (mix of NULL and non-NULL)\n");
         }
         ++failures;
     } else if (empty1 == empty2) {
         if (verbose) {
-            mbedtls_printf("  CALLOC(0): passed (same non-null)\n");
+            mbedtls_printf("  CALLOC(0,1): passed (same non-null)\n");
         }
     } else {
         if (verbose) {
-            mbedtls_printf("  CALLOC(0): passed (distinct non-null)\n");
+            mbedtls_printf("  CALLOC(0,1): passed (distinct non-null)\n");
+        }
+    }
+
+    mbedtls_free(empty1);
+    mbedtls_free(empty2);
+
+    empty1 = mbedtls_calloc(1, 0);
+    empty2 = mbedtls_calloc(1, 0);
+    if (empty1 == NULL && empty2 == NULL) {
+        if (verbose) {
+            mbedtls_printf("  CALLOC(1,0): passed (NULL)\n");
+        }
+    } else if (empty1 == NULL || empty2 == NULL) {
+        if (verbose) {
+            mbedtls_printf("  CALLOC(1,0): failed (mix of NULL and non-NULL)\n");
+        }
+        ++failures;
+    } else if (empty1 == empty2) {
+        if (verbose) {
+            mbedtls_printf("  CALLOC(1,0): passed (same non-null)\n");
+        }
+    } else {
+        if (verbose) {
+            mbedtls_printf("  CALLOC(1,0): passed (distinct non-null)\n");
         }
     }
 
@@ -126,6 +154,28 @@
         }
     }
 
+    for (unsigned int i = 0; i < buffer_3_size; i++) {
+        if (buffer3[i] != 0) {
+            ++failures;
+            if (verbose) {
+                mbedtls_printf("  CALLOC(%u): failed (memory not initialized to 0)\n",
+                               buffer_3_size);
+            }
+            break;
+        }
+    }
+
+    for (unsigned int i = 0; i < buffer_4_size; i++) {
+        if (buffer4[i] != 0) {
+            ++failures;
+            if (verbose) {
+                mbedtls_printf("  CALLOC(%u): failed (memory not initialized to 0)\n",
+                               buffer_4_size);
+            }
+            break;
+        }
+    }
+
     if (verbose) {
         mbedtls_printf("\n");
     }
@@ -133,6 +183,8 @@
     mbedtls_free(empty2);
     mbedtls_free(buffer1);
     mbedtls_free(buffer2);
+    mbedtls_free(buffer3);
+    mbedtls_free(buffer4);
     return failures;
 }
 #endif /* MBEDTLS_SELF_TEST */
diff --git a/programs/test/udp_proxy.c b/programs/test/udp_proxy.c
index cc0bf79..d31947a 100644
--- a/programs/test/udp_proxy.c
+++ b/programs/test/udp_proxy.c
@@ -645,7 +645,7 @@
     memcpy(&prev[prev_len++], delay, sizeof(packet));
 }
 
-int send_delayed()
+int send_delayed(void)
 {
     uint8_t offset;
     int ret;
diff --git a/scripts/code_style.py b/scripts/code_style.py
index 7de93b0..54b5168 100755
--- a/scripts/code_style.py
+++ b/scripts/code_style.py
@@ -81,11 +81,15 @@
                                      universal_newlines=True)
     src_files = output.split()
     if since:
-        output = subprocess.check_output(["git", "diff", "--name-only",
-                                          since, "--"] +
-                                         src_files,
-                                         universal_newlines=True)
-        src_files = output.split()
+        # get all files changed in commits since the starting point
+        cmd = ["git", "log", since + "..HEAD", "--name-only", "--pretty=", "--"] + src_files
+        output = subprocess.check_output(cmd, universal_newlines=True)
+        committed_changed_files = output.split()
+        # and also get all files with uncommitted changes
+        cmd = ["git", "diff", "--name-only", "--"] + src_files
+        output = subprocess.check_output(cmd, universal_newlines=True)
+        uncommitted_changed_files = output.split()
+        src_files = list(set(committed_changed_files + uncommitted_changed_files))
 
     generated_files = list_generated_files()
     # Don't correct style for third-party files (and, for simplicity,
@@ -189,9 +193,10 @@
     parser.add_argument('-f', '--fix', action='store_true',
                         help=('modify source files to fix the code style '
                               '(default: print diff, do not modify files)'))
-    parser.add_argument('-s', '--since', metavar='COMMIT',
+    parser.add_argument('-s', '--since', metavar='COMMIT', const='mbedtls-2.28', nargs='?',
                         help=('only check files modified since the specified commit'
-                              ' (e.g. --since=HEAD~3 or --since=development)'))
+                              ' (e.g. --since=HEAD~3 or --since=mbedtls-2.28). If no'
+                              ' commit is specified, default to mbedtls-2.28.'))
     # --subset is almost useless: it only matters if there are no files
     # ('code_style.py' without arguments checks all files known to Git,
     # 'code_style.py --subset' does nothing). In particular,
diff --git a/scripts/output_env.sh b/scripts/output_env.sh
index 1d9e0fa..5356132 100755
--- a/scripts/output_env.sh
+++ b/scripts/output_env.sh
@@ -105,9 +105,37 @@
 print_version "gcc" "--version" "" "head -n 1"
 echo
 
+if [ -n "${GCC_EARLIEST+set}" ]; then
+    print_version "${GCC_EARLIEST}" "--version" "" "head -n 1"
+else
+    echo " GCC_EARLIEST : Not configured."
+fi
+echo
+
+if [ -n "${GCC_LATEST+set}" ]; then
+    print_version "${GCC_LATEST}" "--version" "" "head -n 1"
+else
+    echo " GCC_LATEST : Not configured."
+fi
+echo
+
 print_version "clang" "--version" "" "head -n 2"
 echo
 
+if [ -n "${CLANG_EARLIEST+set}" ]; then
+    print_version "${CLANG_EARLIEST}" "--version" "" "head -n 2"
+else
+    echo " CLANG_EARLIEST : Not configured."
+fi
+echo
+
+if [ -n "${CLANG_LATEST+set}" ]; then
+    print_version "${CLANG_LATEST}" "--version" "" "head -n 2"
+else
+    echo " CLANG_LATEST : Not configured."
+fi
+echo
+
 print_version "ldd" "--version" "" "head -n 1"
 echo
 
diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index 17e0f90..e2e4190 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -61,6 +61,14 @@
 	$(OPENSSL) pkey -in $< -out $@ -inform PEM -outform DER -passin "pass:$(test_ca_pwd_rsa)"
 all_final += test-ca.key.der
 
+# This is only used for generating cert_example_multi_nocn.crt
+test-ca_nocn.crt: $(test_ca_key_file_rsa)
+	$(MBEDTLS_CERT_WRITE) is_ca=1 serial=3 selfsign=1 \
+		subject_key=$(test_ca_key_file_rsa) subject_pwd=$(test_ca_pwd_rsa)  subject_name="C=NL" \
+		issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) issuer_name="C=NL" \
+		not_before=20190210144400 not_after=20290210144400 md=SHA1 version=3 output_file=$@
+all_intermediate += test-ca_nocn.crt
+
 test-ca-sha1.crt: $(test_ca_key_file_rsa) test-ca.req.sha256
 	$(MBEDTLS_CERT_WRITE) is_ca=1 serial=3 request_file=test-ca.req.sha256 selfsign=1 issuer_name="C=NL,O=PolarSSL,CN=PolarSSL Test CA" issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20190210144400 not_after=20290210144400 md=SHA1 version=3 output_file=$@
 all_final += test-ca-sha1.crt
@@ -97,6 +105,16 @@
 cert_example_multi.crt: cert_example_multi.csr
 	$(OPENSSL) x509 -req -CA $(test_ca_crt) -CAkey $(test_ca_key_file_rsa) -extfile $(test_ca_config_file) -extensions dns_alt_names -passin "pass:$(test_ca_pwd_rsa)" -set_serial 17 -days 3653 -sha256 -in $< > $@
 
+cert_example_multi_nocn.csr: rsa_pkcs1_1024_clear.pem
+	$(MBEDTLS_CERT_REQ) filename=$< output_file=$@ subject_name='C=NL'
+all_intermediate += cert_example_multi_nocn.csr
+
+cert_example_multi_nocn.crt: cert_example_multi_nocn.csr test-ca_nocn.crt
+	$(OPENSSL) x509 -req -CA test-ca_nocn.crt -CAkey $(test_ca_key_file_rsa) \
+		-extfile $(test_ca_config_file) -extensions ext_multi_nocn -passin "pass:$(test_ca_pwd_rsa)" \
+		-set_serial  0xf7c67ff8e9a963f9 -days 3653 -sha1 -in $< > $@
+all_final += cert_example_multi_nocn.crt
+
 $(test_ca_key_file_rsa_alt):test-ca.opensslconf
 	$(OPENSSL) genrsa -out $@ 2048
 test-ca-alt.csr: $(test_ca_key_file_rsa_alt) $(test_ca_config_file)
@@ -116,13 +134,28 @@
 test_ca_key_file_ec = test-ca2.key
 
 test-ca2.req.sha256: $(test_ca_key_file_ec)
-	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$(test_ca_key_file_ec) subject_name="C=NL,O=PolarSSL,CN=Polarssl Test EC CA" md=SHA256
+	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$(test_ca_key_file_ec) \
+	subject_name="C=NL,O=PolarSSL,CN=Polarssl Test EC CA" md=SHA256
 all_intermediate += test-ca2.req.sha256
 
 test-ca2.crt: $(test_ca_key_file_ec) test-ca2.req.sha256
-	$(MBEDTLS_CERT_WRITE) is_ca=1 serial=13926223505202072808 request_file=test-ca2.req.sha256 selfsign=1 issuer_name="C=NL,O=PolarSSL,CN=Polarssl Test EC CA" issuer_key=$(test_ca_key_file_ec) not_before=20190210144400 not_after=20290210144400 md=SHA256 version=3 output_file=$@
+	$(MBEDTLS_CERT_WRITE) is_ca=1 serial=13926223505202072808 selfsign=1 \
+		request_file=test-ca2.req.sha256 \
+		issuer_name="C=NL,O=PolarSSL,CN=Polarssl Test EC CA" \
+		issuer_key=$(test_ca_key_file_ec) \
+		not_before=20190210144400 not_after=20290210144400 \
+		md=SHA256 version=3 output_file=$@
 all_final += test-ca2.crt
 
+test-ca2.ku-%.crt: test-ca2.ku-%.crt.openssl.v3_ext $(test_ca_key_file_ec) test-ca2.req.sha256
+	$(OPENSSL) x509 -req -in test-ca2.req.sha256 -extfile $< \
+		-signkey $(test_ca_key_file_ec) -days 3653 -out $@
+
+all_final += test-ca2.ku-crl.crt \
+			 test-ca2.ku-crt.crt \
+			 test-ca2.ku-crt_crl.crt \
+			 test-ca2.ku-ds.crt
+
 test-ca2-future.crt: $(test_ca_key_file_ec) test-ca2.req.sha256
 	$(MBEDTLS_CERT_WRITE) is_ca=1 serial=13926223505202072808 request_file=test-ca2.req.sha256 selfsign=1 \
 		issuer_name="C=NL,O=PolarSSL,CN=Polarssl Test EC CA" issuer_key=$(test_ca_key_file_ec) \
@@ -147,11 +180,15 @@
 all_final += $(test_ca_ec_cat)
 
 test-ca-any_policy.crt: $(test_ca_key_file_rsa) test-ca.req.sha256
-	$(OPENSSL) req -x509 -config $(test_ca_config_file) -extensions v3_any_policy_ca -key $(test_ca_key_file_rsa) -passin "pass:$(test_ca_pwd_rsa)" -set_serial 0 -days 3653 -sha256 -in test-ca.req.sha256 -out $@
+	$(OPENSSL) req -x509 -config $(test_ca_config_file) -extensions v3_any_policy_ca \
+		-key $(test_ca_key_file_rsa) -passin "pass:$(test_ca_pwd_rsa)" \
+		-set_serial 0 -days 3653 -sha256 -in test-ca.req.sha256 -out $@
 all_final += test-ca-any_policy.crt
 
 test-ca-any_policy_ec.crt: $(test_ca_key_file_ec) test-ca.req_ec.sha256
-	$(OPENSSL) req -x509 -config $(test_ca_config_file) -extensions v3_any_policy_ca -key $(test_ca_key_file_ec) -set_serial 0 -days 3653 -sha256 -in test-ca.req_ec.sha256 -out $@
+	$(OPENSSL) req -x509 -config $(test_ca_config_file) -extensions v3_any_policy_ca \
+		-key $(test_ca_key_file_ec) -set_serial 0 -days 3653 -sha256 \
+		-in test-ca.req_ec.sha256 -out $@
 all_final += test-ca-any_policy_ec.crt
 
 test-ca-any_policy_with_qualifier.crt: $(test_ca_key_file_rsa) test-ca.req.sha256
@@ -375,9 +412,23 @@
 
 # try to forge a copy of test-int-ca3 with different key
 server5-ss-forgeca.crt: server5.key
-	$(FAKETIME) '2015-09-01 14:08:43' $(OPENSSL) req -x509 -new -subj "/C=UK/O=mbed TLS/CN=mbed TLS Test intermediate CA 3" -set_serial 77 -config $(test_ca_config_file) -extensions noext_ca -days 3650 -sha256 -key $< -out $@
+	$(OPENSSL) req -x509 -new -subj "/C=UK/O=mbed TLS/CN=mbed TLS Test intermediate CA 3" \
+		-set_serial 77 -config $(test_ca_config_file) -extensions noext_ca \
+		-days 3650 -sha256 -key $< -out $@
 all_final += server5-ss-forgeca.crt
 
+server5-selfsigned.crt: server5.key
+	openssl req -x509 -key server5.key \
+        -sha256 -days 3650 -nodes \
+        -addext basicConstraints=critical,CA:FALSE \
+        -addext keyUsage=critical,digitalSignature \
+        -addext subjectKeyIdentifier=hash   \
+        -addext authorityKeyIdentifier=none \
+        -set_serial 0x53a2cb4b124ead837da894b2 \
+        -subj "/CN=selfsigned/OU=testing/O=PolarSSL/C=NL" \
+        -out $@
+all_final += server5-selfsigned.crt
+
 server5-othername.crt: server5.key
 	$(OPENSSL) req -x509 -new -subj "/C=UK/O=Mbed TLS/CN=Mbed TLS othername SAN" -set_serial 77 -config $(test_ca_config_file) -extensions othername_san -days 3650 -sha256 -key $< -out $@
 
@@ -422,6 +473,59 @@
 	{ head -n-2 $<; tail -n-2 $< | sed -e '1s/0\(=*\)$$/_\1/' -e '1s/[^_=]\(=*\)$$/0\1/' -e '1s/_/1/'; } > $@
 all_final += test-int-ca3-badsign.crt
 
+# server9*
+
+server9.csr: server9.key
+	$(OPENSSL) req -new -subj "/C=NL/O=PolarSSL/CN=localhost" \
+					-key $< -out $@
+server9.crt: server9-sha1.crt
+	cp $< $@
+all_final += server9.crt
+all_intermediate += server9.csr server9-sha1.crt
+
+server9-%.crt: server9.csr $(test_ca_crt) $(test_ca_key_file_rsa)
+	$(OPENSSL) x509 -req -extfile $(cli_crt_extensions_file) -extensions cli-rsa \
+		-passin "pass:$(test_ca_pwd_rsa)" -CA $(test_ca_crt) -CAkey $(test_ca_key_file_rsa) \
+		-set_serial $(SERVER9_CRT_SERIAL) -days 3653 \
+		-sigopt rsa_padding_mode:pss -sigopt rsa_pss_saltlen:max \
+		-sigopt rsa_mgf1_md:$(@:server9-%.crt=%) -$(@:server9-%.crt=%) \
+		-in $< -out $@
+server9-sha1.crt: SERVER9_CRT_SERIAL=22
+server9-sha224.crt: SERVER9_CRT_SERIAL=23
+server9-sha256.crt: SERVER9_CRT_SERIAL=24
+server9-sha384.crt: SERVER9_CRT_SERIAL=25
+server9-sha512.crt: SERVER9_CRT_SERIAL=26
+all_final += server9-sha224.crt server9-sha256.crt server9-sha384.crt server9-sha512.crt
+
+server9-defaults.crt: server9.csr $(test_ca_crt) $(test_ca_key_file_rsa)
+	$(OPENSSL) x509 -req -extfile $(cli_crt_extensions_file) -extensions cli-rsa \
+		-passin "pass:$(test_ca_pwd_rsa)" -CA $(test_ca_crt) -CAkey $(test_ca_key_file_rsa) \
+		-set_serial 72 -days 3653 \
+		-sigopt rsa_padding_mode:pss -sigopt rsa_pss_saltlen:max -sha1 \
+		-in $< -out $@
+all_final += server9-defaults.crt
+
+server9-badsign.crt: server9.crt
+	{ head -n-2 $<; tail -n-2 $< | sed -e '1s/0\(=*\)$$/_\1/' -e '1s/[^_=]\(=*\)$$/0\1/' -e '1s/_/1/'; } > $@
+all_final += server9-badsign.crt
+
+server9-with-ca.crt: server9.crt $(test_ca_crt)
+	cat $^ > $@
+all_final += server9-with-ca.crt
+
+# FIXME: This file needs special sequence. It should be update manually
+server9-bad-saltlen.crt: server9.csr $(test_ca_crt) $(test_ca_key_file_rsa)
+	false
+
+server9-bad-mgfhash.crt: server9.csr $(test_ca_crt) $(test_ca_key_file_rsa)
+	$(OPENSSL) x509 -req -extfile $(cli_crt_extensions_file) -extensions cli-rsa \
+		-passin "pass:$(test_ca_pwd_rsa)" -CA $(test_ca_crt) -CAkey $(test_ca_key_file_rsa) \
+		-set_serial 24 -days 3653 \
+		-sigopt rsa_padding_mode:pss -sigopt rsa_pss_saltlen:max \
+		-sigopt rsa_mgf1_md:sha224 -sha256 \
+		-in $< -out $@
+all_final += server9-bad-mgfhash.crt
+
 # server10*
 
 server10.crt: server10.key test-int-ca3.crt test-int-ca3.key
@@ -1210,9 +1314,37 @@
 
 # The use of 'Server 1' in the DN is intentional here, as the DN is hardcoded in the x509_write test suite.'
 server5.req.ku.sha1: server5.key
-	$(MBEDTLS_CERT_REQ) output_file=$@ filename=$< key_usage=digital_signature,non_repudiation subject_name="C=NL,O=PolarSSL,CN=PolarSSL Server 1" md=SHA1
+	$(OPENSSL) req -key $< -out $@ -new -nodes -subj "/C=NL/O=PolarSSL/CN=PolarSSL Server 1" -sha1 -addext keyUsage=digitalSignature,nonRepudiation
 all_final += server5.req.ku.sha1
 
+server5.ku-ds.crt: SERVER5_CRT_SERIAL=45
+server5.ku-ds.crt: SERVER5_KEY_USAGE=digital_signature
+server5.ku-ka.crt: SERVER5_CRT_SERIAL=46
+server5.ku-ka.crt: SERVER5_KEY_USAGE=key_agreement
+server5.ku-ke.crt: SERVER5_CRT_SERIAL=47
+server5.ku-ke.crt: SERVER5_KEY_USAGE=key_encipherment
+server5.eku-cs.crt: SERVER5_CRT_SERIAL=58
+server5.eku-cs.crt: SERVER5_EXT_KEY_USAGE=codeSigning
+server5.eku-cs_any.crt: SERVER5_CRT_SERIAL=59
+server5.eku-cs_any.crt: SERVER5_EXT_KEY_USAGE=codeSigning,any
+server5.eku-cli.crt: SERVER5_CRT_SERIAL=60
+server5.eku-cli.crt: SERVER5_EXT_KEY_USAGE=clientAuth
+server5.eku-srv_cli.crt: SERVER5_CRT_SERIAL=61
+server5.eku-srv_cli.crt: SERVER5_EXT_KEY_USAGE=serverAuth,clientAuth
+server5.eku-srv.crt: SERVER5_CRT_SERIAL=62
+server5.eku-srv.crt: SERVER5_EXT_KEY_USAGE=serverAuth
+server5.ku-%.crt: SERVER5_EXT_OPTS=key_usage=$(SERVER5_KEY_USAGE)
+# The commands for server5.eku-*.crt is invalid because `ext_key_usage` was not supported by
+# `cert_write` in 2.28. This would be fixed by #8083.
+server5.eku-%.crt: SERVER5_EXT_OPTS=ext_key_usage=$(SERVER5_EXT_KEY_USAGE)
+server5.%.crt: server5.key
+	$(MBEDTLS_CERT_WRITE) \
+		subject_key=$< subject_name="C=NL,O=PolarSSL,CN=localhost" serial=$(SERVER5_CRT_SERIAL) \
+		issuer_crt=$(test_ca_crt_file_ec) issuer_key=$(test_ca_key_file_ec) $(SERVER5_EXT_OPTS) \
+		not_before=20190210144406 not_after=20290210144406 md=SHA256 version=3 output_file=$@
+all_final += server5.ku-ka.crt server5.ku-ke.crt server5.ku-ds.crt
+all_final += server5.eku-cs.crt server5.eku-cs_any.crt server5.eku-cli.crt server5.eku-srv_cli.crt server5.eku-srv.crt
+
 # server6*
 
 server6.csr: server6.key
@@ -1224,6 +1356,18 @@
 				-extfile server5.crt.openssl.v3_ext -set_serial 10 -days 3650 -sha256 -in $< -out $@
 all_final += server6.crt
 
+server6-ss-child.csr : server6.key
+	$(OPENSSL) req -new -subj "/CN=selfsigned-child/OU=testing/O=PolarSSL/C=NL" \
+		-key $< -out $@
+all_intermediate += server6-ss-child.csr
+server6-ss-child.crt: server6-ss-child.csr server5-selfsigned.crt server5.key server6-ss-child.crt.openssl.v3_ext
+	$(OPENSSL) x509 -req -CA server5-selfsigned.crt -CAkey server5.key \
+				-extfile server6-ss-child.crt.openssl.v3_ext \
+				-set_serial 0x53a2cb5822399474a7ec79ec \
+				-days 3650 -sha256 -in $< -out $@
+all_final += server6-ss-child.crt
+
+
 ################################################################
 ### Generate certificates for CRT write check tests
 ################################################################
@@ -1243,7 +1387,11 @@
 # server1*
 
 server1.crt: server1.key server1.req.sha256 $(test_ca_crt) $(test_ca_key_file_rsa)
-	$(MBEDTLS_CERT_WRITE) request_file=server1.req.sha256 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) version=1 not_before=20190210144406 not_after=20290210144406 md=SHA1 version=3 output_file=$@
+	$(MBEDTLS_CERT_WRITE) request_file=server1.req.sha256 \
+		issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) \
+		issuer_pwd=$(test_ca_pwd_rsa) version=1 \
+		not_before=20190210144406 not_after=20290210144406 \
+		md=SHA1 version=3 output_file=$@
 server1.noauthid.crt: server1.key server1.req.sha256 $(test_ca_crt) $(test_ca_key_file_rsa)
 	$(MBEDTLS_CERT_WRITE) request_file=server1.req.sha256 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20190210144406 not_after=20290210144406 md=SHA1 authority_identifier=0 version=3 output_file=$@
 server1.crt.der: server1.crt
@@ -1284,6 +1432,16 @@
 	$(OPENSSL) x509 -inform PEM -in $< -outform DER -out $@
 all_final += server1.ca.crt server1.ca_noauthid.crt server1.ca.der
 
+server1-nospace.crt: server1.key test-ca.crt
+	$(MBEDTLS_CERT_WRITE) subject_key=$< serial=31\
+		subject_name="C=NL,O=PolarSSL,CN=polarssl.example"  \
+		issuer_crt=test-ca.crt issuer_key=$(test_ca_key_file_rsa) \
+		issuer_pwd=$(test_ca_pwd_rsa) \
+		not_before=20190210144406 not_after=20290210144406 \
+		md=SHA256 version=3 authority_identifier=1 \
+		output_file=$@
+all_final += server1-nospace.crt
+
 server1_ca.crt: server1.crt $(test_ca_crt)
 	cat server1.crt $(test_ca_crt) > $@
 all_final += server1_ca.crt
@@ -1342,8 +1500,13 @@
 crl.pem: $(test_ca_crt) $(test_ca_key_file_rsa) $(test_ca_config_file)
 	$(OPENSSL) ca -gencrl -batch -cert $(test_ca_crt) -keyfile $(test_ca_key_file_rsa) -key $(test_ca_pwd_rsa) -config $(test_ca_server1_config_file) -md sha1 -crldays 3653 -out $@
 
-crl-futureRevocationDate.pem: $(test_ca_crt) $(test_ca_key_file_rsa) $(test_ca_config_file) test-ca.server1.future-crl.db  test-ca.server1.future-crl.opensslconf
-	$(FAKETIME) '2028-12-31' $(OPENSSL) ca -gencrl -config test-ca.server1.future-crl.opensslconf -crldays 365 -passin "pass:$(test_ca_pwd_rsa)" -out $@
+crl-futureRevocationDate.pem: $(test_ca_crt) $(test_ca_key_file_rsa) \
+							  $(test_ca_config_file) 				\
+							  test-ca.server1.future-crl.db  \
+							  test-ca.server1.future-crl.opensslconf
+	$(FAKETIME) -f '+10y' $(OPENSSL) ca -gencrl \
+		-config test-ca.server1.future-crl.opensslconf -crldays 365 \
+		-passin "pass:$(test_ca_pwd_rsa)" -out $@
 
 server1_all: crl.pem crl-futureRevocationDate.pem server1.crt server1.noauthid.crt server1.crt.openssl server1.v1.crt server1.v1.crt.openssl server1.key_usage.crt server1.key_usage_noauthid.crt server1.key_usage.crt.openssl server1.cert_type.crt server1.cert_type_noauthid.crt server1.cert_type.crt.openssl server1.der server1.der.openssl server1.v1.der server1.v1.der.openssl server1.key_usage.der server1.key_usage.der.openssl server1.cert_type.der server1.cert_type.der.openssl
 
@@ -1361,6 +1524,25 @@
 	$(MBEDTLS_CERT_WRITE) request_file=server2.req.sha256 serial=2 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20190210144406 not_after=20290210144406 md=SHA256 version=3 output_file=$@
 all_final += server2-sha256.crt
 
+server2.ku-ka.crt: SERVER2_CRT_SERIAL=42
+server2.ku-ka.crt: SERVER2_KEY_USAGE=key_agreement
+server2.ku-ke.crt: SERVER2_CRT_SERIAL=43
+server2.ku-ke.crt: SERVER2_KEY_USAGE=key_encipherment
+server2.ku-ds.crt: SERVER2_CRT_SERIAL=44
+server2.ku-ds.crt: SERVER2_KEY_USAGE=digital_signature
+server2.ku-ds_ke.crt: SERVER2_CRT_SERIAL=48
+server2.ku-ds_ke.crt: SERVER2_KEY_USAGE=digital_signature,key_encipherment
+server2.ku-%.crt: server2.req.sha256
+	$(MBEDTLS_CERT_WRITE) request_file=server2.req.sha256 serial=$(SERVER2_CRT_SERIAL) \
+		issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) \
+		key_usage="$(SERVER2_KEY_USAGE)" \
+		not_before=20190210144406 not_after=20290210144406 md=SHA1 version=3 output_file=$@
+all_final += server2.ku-ka.crt server2.ku-ke.crt server2.ku-ds.crt server2.ku-ds_ke.crt
+
+server2-badsign.crt: server2.crt
+	{ head -n-2 $<; tail -n-2 $< | sed -e '1s/0\(=*\)$$/_\1/' -e '1s/[^_=]\(=*\)$$/0\1/' -e '1s/_/1/'; } > $@
+all_final += server2-badsign.crt
+
 # server3*
 
 server3.crt: server3.key
@@ -1407,6 +1589,41 @@
 	$(MBEDTLS_CERT_WRITE) request_file=$< serial=6 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20000101121212 not_after=20300101121212 md=MD5 version=3 output_file=$@
 all_final += cert_md5.crt
 
+# - test-ca-v1.crt: v1 "CA", signs
+#     server1-v1.crt: v1 "intermediate CA", signs
+#         server2-v1*.crt: EE cert (without of with chain in same file)
+
+test-ca-v1.crt: $(test_ca_key_file_rsa) test-ca.req.sha256
+	$(MBEDTLS_CERT_WRITE) is_ca=1 serial=25883963888465069501131757029 \
+		request_file=test-ca.req.sha256 \
+		selfsign=1 issuer_name="CN=PolarSSL Test CA v1,OU=testing,O=PolarSSL,C=NL" \
+		issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) \
+		not_before=20190210144400 not_after=20290210144400 md=SHA256 version=1 \
+		output_file=$@
+all_final += test-ca-v1.crt
+
+server1-v1.crt: server1.key test-ca-v1.crt
+	$(MBEDTLS_CERT_WRITE) subject_key=$< serial=25883964939897181595909491649 \
+		subject_name="CN=server1/int-ca-v1,OU=testing,O=PolarSSL,C=NL"  \
+		issuer_crt=test-ca-v1.crt issuer_key=$(test_ca_key_file_rsa) \
+		issuer_pwd=$(test_ca_pwd_rsa) \
+		not_before=20190210144406 not_after=20290210144406 \
+		md=SHA256 version=1 \
+		output_file=$@
+all_final += server1-v1.crt
+
+server2-v1.crt: server2.key server1-v1.crt
+	$(MBEDTLS_CERT_WRITE) subject_key=$< serial=25883965274140956871506900844 \
+		subject_name="CN=server2,OU=testing,O=PolarSSL,C=NL"  \
+		issuer_crt=server1-v1.crt issuer_key=server1.key \
+		not_before=20190210144406 not_after=20290210144406 \
+		md=SHA256 version=1 \
+		output_file=$@
+all_final += server2-v1.crt
+
+server2-v1-chain.crt: server2-v1.crt server1-v1.crt
+	cat $^ > $@
+
 ################################################################
 #### Diffie-Hellman parameters
 ################################################################
diff --git a/tests/data_files/Readme-x509.txt b/tests/data_files/Readme-x509.txt
index 84c775f..82f93d2 100644
--- a/tests/data_files/Readme-x509.txt
+++ b/tests/data_files/Readme-x509.txt
@@ -76,6 +76,10 @@
     -badsign.crt: S5 with corrupted signature
     -expired.crt: S5 with "not after" date in the past
     -future.crt: S5 with "not before" date in the future
+    -non-compliant.crt: S5, RFC non-compliant
+      (with forbidden EC algorithm identifier NULL parameter)
+      generated by (before fix):
+        cert_write subject_key=server5.key subject_name="CN=Test EC RFC non-compliant" issuer_crt=test-ca2.crt issuer_key=test-ca2.key
     -selfsigned.crt: Self-signed cert with S5 key
     -ss-expired.crt: Self-signed cert with S5 key, expired
     -ss-forgeca.crt: Copy of test-int-ca3 self-signed with S5 key
diff --git a/tests/data_files/cert_example_multi_nocn.crt b/tests/data_files/cert_example_multi_nocn.crt
index 1634846..08bf63c 100644
--- a/tests/data_files/cert_example_multi_nocn.crt
+++ b/tests/data_files/cert_example_multi_nocn.crt
@@ -1,13 +1,16 @@
 -----BEGIN CERTIFICATE-----
-MIIB/TCCAWagAwIBAgIJAPfGf/jpqWP5MA0GCSqGSIb3DQEBBQUAMA0xCzAJBgNV
-BAYTAk5MMB4XDTE0MDEyMjEwMDQzM1oXDTI0MDEyMjEwMDQzM1owDTELMAkGA1UE
-BhMCTkwwgZ8wDQYJKoZIhvcNAQEBBQADgY0AMIGJAoGBAN0Rip+ZurBoyirqO2pt
-WZftTslU5A3uzqB9oB6q6A7CuxNA24oSjokTJKXF9frY9ZDXyMrLxf6THa/aEiNz
-UnlGGrqgVyt2FjGzqK/nOJsIi2OZOgol7kXSGFi6uZMa7dRYmmMbN/z3FAifhWVJ
-81kybdHg6G3eUu1mtKkL2kCVAgMBAAGjZTBjMAkGA1UdEwQCMAAwCwYDVR0PBAQD
+MIICfjCCAWagAwIBAgIJAPfGf/jpqWP5MA0GCSqGSIb3DQEBBQUAMA0xCzAJBgNV
+BAYTAk5MMB4XDTIzMDUxODAyMDUwMVoXDTMzMDUxODAyMDUwMVowDTELMAkGA1UE
+BhMCTkwwgZ8wDQYJKoZIhvcNAQEBBQADgY0AMIGJAoGBAMc4ksXD9HAQCGv4EzXs
+8wEciiUPlYI2HqoelhJVGqz4e3UzC3BXM5zZlfFNTEQ3yL7EoD/kZDzT88kCQz3D
+fFuOeaoJhK6CEzcKv4VpvSo1Ymyx/uSs4EKyQXx75J0nFJssB2uOQz0/bHY6Rpoc
+cA0lnbwIx0D82AI3Yv996/wtAgMBAAGjZTBjMAkGA1UdEwQCMAAwCwYDVR0PBAQD
 AgXgMEkGA1UdEQRCMECCHHd3dy5zaG90b2thbi1icmF1bnNjaHdlaWcuZGWCFHd3
-dy5tYXNzaW1vLWFiYXRlLmV1hwTAqAEBhwTAqEWQMA0GCSqGSIb3DQEBBQUAA4GB
-ABjx1ytrqCyFC5/0cjWnbLK9vsvLny2ZikDewfRxqJ5zAxGWLqHOr1SmUmu2DrvB
-bkT9g5z19+iMhPnzJz1x7Q2m7WTIJTuUPK+hKZJATDLNhZ86h5Nkw8k9YzKcOrPm
-EIqsy55CSgLU0ntljqSBvSb4ifrF1NnIWej2lSfN6r+3
+dy5tYXNzaW1vLWFiYXRlLmV1hwTAqAEBhwTAqEWQMA0GCSqGSIb3DQEBBQUAA4IB
+AQAuomKlMLwSkP3zvGuA9awDdITM/uCzfd77yi60zMNtFHDMu2YZ2npQSl0czab6
+/8fX9goaU8V3cx4KXSLMx7i9AsP1r559Uo3c/4oTZd3xBsElMAn/TXiuujZ2RwdL
+RcMOJerlThOE0dtNdniJj7lPaan70CELP/CUn8KgeWgztQJj4ghfUwnLn6RnpLfl
+YyM/Xq2YbwnQWHXSe3CPTy5RCWalt3SgZf6IDcD6CNq1Q2l14iR78OWnlxGTFmjP
+ez3OzxNT2BZz0AiP0WvTbUtvfuxw9G3fHHe5ClsAopIA3tD246jHOAlqAnOEBC/x
+IABbWjY/briP9U4R6x+mg2ck
 -----END CERTIFICATE-----
diff --git a/tests/data_files/crl-rsa-pss-sha1-badsign.pem b/tests/data_files/crl-rsa-pss-sha1-badsign.pem
index 7e2a596..d236910 100644
--- a/tests/data_files/crl-rsa-pss-sha1-badsign.pem
+++ b/tests/data_files/crl-rsa-pss-sha1-badsign.pem
@@ -1,14 +1,14 @@
 -----BEGIN X509 CRL-----
 MIICJDCCAQYCAQEwEwYJKoZIhvcNAQEKMAaiBAICAOowOzELMAkGA1UEBhMCTkwx
-ETAPBgNVBAoTCFBvbGFyU1NMMRkwFwYDVQQDExBQb2xhclNTTCBUZXN0IENBFw0x
-NDAxMjAxMzQ2MzVaFw0yNDAxMTgxMzQ2MzVaMCgwEgIBChcNMTMwOTI0MTYyODM4
-WjASAgEWFw0xNDAxMjAxMzQzMDVaoGcwZTBjBgNVHSMEXDBagBS0WuSls97SUva5
-1aaVD+s+vMf9/6E/pD0wOzELMAkGA1UEBhMCTkwxETAPBgNVBAoTCFBvbGFyU1NM
-MRkwFwYDVQQDExBQb2xhclNTTCBUZXN0IENBggEAMBMGCSqGSIb3DQEBCjAGogQC
-AgDqA4IBAQB8ZBX0BEgRcx0lfk1ctELRu1AYoJ5BnsmQpq23Ca4YIP2yb2kTN1ZS
-4fR4SgYcNctgo2JJiNiUkCu1ZnRUOJUy8UlEio0+aeumTNz6CbeJEDhr5NC3oiV0
-MzvLn9rJVLPetOT9UrvvIy8iz5Pn1d8mu5rkt9BKQRq9NQx8riKnSIoTc91NLCMo
-mkCCB55DVbazODSWK19e6yQ0JS454RglOsqRtLJ/EDbi6lCsLXotFt3GEGMrob1O
-7Qck1Z59boaHxGYFEVnx90+4M3/qikVtwZdcBjLEmfuwYvszFw8J2y6Xwmg/HtUa
-y6li0JzWNHtkKUlCv2+SESZbD3NU8GQY
+ETAPBgNVBAoMCFBvbGFyU1NMMRkwFwYDVQQDDBBQb2xhclNTTCBUZXN0IENBFw0y
+MzA1MTcwODA3NDlaFw0zMzA1MTcwODA3NDlaMCgwEgIBChcNMjMwNTE3MDgwNzQ5
+WjASAgEWFw0yMzA1MTcwODA3NDlaoGcwZTBjBgNVHSMEXDBagBS0WuSls97SUva5
+1aaVD+s+vMf9/6E/pD0wOzELMAkGA1UEBhMCTkwxETAPBgNVBAoMCFBvbGFyU1NM
+MRkwFwYDVQQDDBBQb2xhclNTTCBUZXN0IENBggEDMBMGCSqGSIb3DQEBCjAGogQC
+AgDqA4IBAQCMUepEfAXs1G3hDE7rcIPT/AFv/oLQSVwRE8O2G5r4j0CgzN6CSGNi
+8qfFVX6f7ds+QM4pxAXk5FH4QJJkev0ZBQxmA/ZDLEFmmCEfPMsA69nG//Xeq+Xz
+ZOqJpAewmXoP2UUxV5rRpAIr9g9NvDkTT012eQEpoGkJlpxOln1VW+Dk24PCZFWf
+Nf8GMUzUsXfXm7ZdCeuc8ZDYNma0nWAMR9Jw6qaEhyH4Fd/scFvXiF/i4cpVp8Rk
+M71wSrCC0pkFzw4/bYMnf0aHle/lNg5e78SAT+/6PA8pXL7Urc0IufOfxCGwqY27
+IXSTrZJj4WeQMk289pIccMHj5DUSo4u0
 -----END X509 CRL-----
diff --git a/tests/data_files/crl-rsa-pss-sha1.pem b/tests/data_files/crl-rsa-pss-sha1.pem
index 59ca4f7..c129c0c 100644
--- a/tests/data_files/crl-rsa-pss-sha1.pem
+++ b/tests/data_files/crl-rsa-pss-sha1.pem
@@ -1,14 +1,14 @@
 -----BEGIN X509 CRL-----
 MIICJDCCAQYCAQEwEwYJKoZIhvcNAQEKMAaiBAICAOowOzELMAkGA1UEBhMCTkwx
-ETAPBgNVBAoTCFBvbGFyU1NMMRkwFwYDVQQDExBQb2xhclNTTCBUZXN0IENBFw0x
-NDAxMjAxMzQ2MzVaFw0yNDAxMTgxMzQ2MzVaMCgwEgIBChcNMTMwOTI0MTYyODM4
-WjASAgEWFw0xNDAxMjAxMzQzMDVaoGcwZTBjBgNVHSMEXDBagBS0WuSls97SUva5
-1aaVD+s+vMf9/6E/pD0wOzELMAkGA1UEBhMCTkwxETAPBgNVBAoTCFBvbGFyU1NM
-MRkwFwYDVQQDExBQb2xhclNTTCBUZXN0IENBggEAMBMGCSqGSIb3DQEBCjAGogQC
-AgDqA4IBAQB8ZBX0BEgRcx0lfk1ctELRu1AYoJ5BnsmQpq23Ca4YIP2yb2kTN1ZS
-4fR4SgYcNctgo2JJiNiUkCu1ZnRUOJUy8UlEio0+aeumTNz6CbeJEDhr5NC3oiV0
-MzvLn9rJVLPetOT9UrvvIy8iz5Pn1d8mu5rkt9BKQRq9NQx8riKnSIoTc91NLCMo
-mkCCB55DVbazODSWK19e6yQ0JS454RglOsqRtLJ/EDbi6lCsLXotFt3GEGMrob1O
-7Qck1Z59boaHxGYFEVnx90+4M3/qikVtwZdcBjLEmfuwYvszFw8J2y6Xwmg/HtUa
-y6li0JzWNHtkKUlCv2+SESZbD3NU8GQZ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 -----END X509 CRL-----
diff --git a/tests/data_files/crl-rsa-pss-sha224.pem b/tests/data_files/crl-rsa-pss-sha224.pem
index a51d5d9..1108b3d 100644
--- a/tests/data_files/crl-rsa-pss-sha224.pem
+++ b/tests/data_files/crl-rsa-pss-sha224.pem
@@ -1,16 +1,16 @@
 -----BEGIN X509 CRL-----
-MIICejCCATECAQEwPgYJKoZIhvcNAQEKMDGgDTALBglghkgBZQMEAgShGjAYBgkq
-hkiG9w0BAQgwCwYJYIZIAWUDBAIEogQCAgDiMDsxCzAJBgNVBAYTAk5MMREwDwYD
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diff --git a/tests/data_files/parse_input/server5-non-compliant.crt b/tests/data_files/parse_input/server5-non-compliant.crt
new file mode 100644
index 0000000..abea17d
--- /dev/null
+++ b/tests/data_files/parse_input/server5-non-compliant.crt
@@ -0,0 +1,12 @@
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diff --git a/tests/data_files/server1-nospace.crt b/tests/data_files/server1-nospace.crt
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diff --git a/tests/data_files/server1-v1.crt b/tests/data_files/server1-v1.crt
index 47f1fff..8ca9007 100644
--- a/tests/data_files/server1-v1.crt
+++ b/tests/data_files/server1-v1.crt
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server2-v1-chain.crt b/tests/data_files/server2-v1-chain.crt
index 84bb6b2..8ac003b 100644
--- a/tests/data_files/server2-v1-chain.crt
+++ b/tests/data_files/server2-v1-chain.crt
@@ -1,38 +1,38 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server2-v1.crt b/tests/data_files/server2-v1.crt
index 7ef7968..990cd4b 100644
--- a/tests/data_files/server2-v1.crt
+++ b/tests/data_files/server2-v1.crt
@@ -1,19 +1,19 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server2.ku-ds.crt b/tests/data_files/server2.ku-ds.crt
index 3bd07d0..d1e1251 100644
--- a/tests/data_files/server2.ku-ds.crt
+++ b/tests/data_files/server2.ku-ds.crt
@@ -1,21 +1,20 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server2.ku-ds_ke.crt b/tests/data_files/server2.ku-ds_ke.crt
index ebee7e1..eb23245 100644
--- a/tests/data_files/server2.ku-ds_ke.crt
+++ b/tests/data_files/server2.ku-ds_ke.crt
@@ -1,21 +1,20 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server2.ku-ka.crt b/tests/data_files/server2.ku-ka.crt
index 90f7c4a..ce97e82 100644
--- a/tests/data_files/server2.ku-ka.crt
+++ b/tests/data_files/server2.ku-ka.crt
@@ -1,21 +1,20 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server2.ku-ke.crt b/tests/data_files/server2.ku-ke.crt
index 8daa0c1..21e6cf0 100644
--- a/tests/data_files/server2.ku-ke.crt
+++ b/tests/data_files/server2.ku-ke.crt
@@ -1,21 +1,20 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server5-selfsigned.crt b/tests/data_files/server5-selfsigned.crt
index cb55647..0eafe70 100644
--- a/tests/data_files/server5-selfsigned.crt
+++ b/tests/data_files/server5-selfsigned.crt
@@ -1,12 +1,12 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server5-ss-forgeca.crt b/tests/data_files/server5-ss-forgeca.crt
index 2265bf5..cf5bd6d 100644
--- a/tests/data_files/server5-ss-forgeca.crt
+++ b/tests/data_files/server5-ss-forgeca.crt
@@ -1,11 +1,11 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server5.eku-cli.crt b/tests/data_files/server5.eku-cli.crt
index 8aa2e44..8d04559 100644
--- a/tests/data_files/server5.eku-cli.crt
+++ b/tests/data_files/server5.eku-cli.crt
@@ -1,13 +1,13 @@
 -----BEGIN CERTIFICATE-----
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diff --git a/tests/data_files/server5.eku-cs.crt b/tests/data_files/server5.eku-cs.crt
index db97b40..c00bc3b 100644
--- a/tests/data_files/server5.eku-cs.crt
+++ b/tests/data_files/server5.eku-cs.crt
@@ -1,13 +1,13 @@
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diff --git a/tests/data_files/server5.eku-cs_any.crt b/tests/data_files/server5.eku-cs_any.crt
index 8fa8632..912d929 100644
--- a/tests/data_files/server5.eku-cs_any.crt
+++ b/tests/data_files/server5.eku-cs_any.crt
@@ -1,13 +1,13 @@
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diff --git a/tests/data_files/server5.eku-srv.crt b/tests/data_files/server5.eku-srv.crt
index 64312f6..b173afc 100644
--- a/tests/data_files/server5.eku-srv.crt
+++ b/tests/data_files/server5.eku-srv.crt
@@ -1,13 +1,13 @@
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diff --git a/tests/data_files/server5.eku-srv_cli.crt b/tests/data_files/server5.eku-srv_cli.crt
index 9f58fed..be2531e 100644
--- a/tests/data_files/server5.eku-srv_cli.crt
+++ b/tests/data_files/server5.eku-srv_cli.crt
@@ -1,13 +1,13 @@
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diff --git a/tests/data_files/server5.ku-ds.crt b/tests/data_files/server5.ku-ds.crt
index 58dd071..dafff9b 100644
--- a/tests/data_files/server5.ku-ds.crt
+++ b/tests/data_files/server5.ku-ds.crt
@@ -1,14 +1,13 @@
 -----BEGIN CERTIFICATE-----
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diff --git a/tests/data_files/server5.ku-ka.crt b/tests/data_files/server5.ku-ka.crt
index 2447326..74a4235 100644
--- a/tests/data_files/server5.ku-ka.crt
+++ b/tests/data_files/server5.ku-ka.crt
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server5.ku-ke.crt b/tests/data_files/server5.ku-ke.crt
index 41ae5ad..6b4e74e 100644
--- a/tests/data_files/server5.ku-ke.crt
+++ b/tests/data_files/server5.ku-ke.crt
@@ -1,14 +1,13 @@
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server5.req.ku.sha1 b/tests/data_files/server5.req.ku.sha1
index 3281c94..c73a0e2 100644
--- a/tests/data_files/server5.req.ku.sha1
+++ b/tests/data_files/server5.req.ku.sha1
@@ -1,8 +1,8 @@
 -----BEGIN CERTIFICATE REQUEST-----
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 -----END CERTIFICATE REQUEST-----
diff --git a/tests/data_files/server6-ss-child.crt b/tests/data_files/server6-ss-child.crt
index 3c6fd4d..fc28f34 100644
--- a/tests/data_files/server6-ss-child.crt
+++ b/tests/data_files/server6-ss-child.crt
@@ -1,13 +1,13 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server6-ss-child.crt.openssl.v3_ext b/tests/data_files/server6-ss-child.crt.openssl.v3_ext
new file mode 100644
index 0000000..dd9cdaa
--- /dev/null
+++ b/tests/data_files/server6-ss-child.crt.openssl.v3_ext
@@ -0,0 +1,4 @@
+basicConstraints = critical,CA:false
+keyUsage=critical,digitalSignature
+subjectKeyIdentifier=hash
+
diff --git a/tests/data_files/server9-bad-mgfhash.crt b/tests/data_files/server9-bad-mgfhash.crt
index 34ef69e..ad29942 100644
--- a/tests/data_files/server9-bad-mgfhash.crt
+++ b/tests/data_files/server9-bad-mgfhash.crt
@@ -1,20 +1,21 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server9-bad-saltlen.crt b/tests/data_files/server9-bad-saltlen.crt
index f4da883..45bf20e 100644
--- a/tests/data_files/server9-bad-saltlen.crt
+++ b/tests/data_files/server9-bad-saltlen.crt
@@ -1,20 +1,21 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server9-badsign.crt b/tests/data_files/server9-badsign.crt
index 9e56541..8656b1a 100644
--- a/tests/data_files/server9-badsign.crt
+++ b/tests/data_files/server9-badsign.crt
@@ -1,19 +1,19 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server9-defaults.crt b/tests/data_files/server9-defaults.crt
index 4ce5c87..8613f52 100644
--- a/tests/data_files/server9-defaults.crt
+++ b/tests/data_files/server9-defaults.crt
@@ -1,19 +1,18 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server9-sha224.crt b/tests/data_files/server9-sha224.crt
index 1b05f31..ed648c8 100644
--- a/tests/data_files/server9-sha224.crt
+++ b/tests/data_files/server9-sha224.crt
@@ -1,20 +1,21 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server9-sha256.crt b/tests/data_files/server9-sha256.crt
index 7d0aa39..ef37b3f 100644
--- a/tests/data_files/server9-sha256.crt
+++ b/tests/data_files/server9-sha256.crt
@@ -1,20 +1,21 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server9-sha384.crt b/tests/data_files/server9-sha384.crt
index aaa63e6..2ea0108 100644
--- a/tests/data_files/server9-sha384.crt
+++ b/tests/data_files/server9-sha384.crt
@@ -1,20 +1,21 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server9-sha512.crt b/tests/data_files/server9-sha512.crt
index a211b92..4abdf68 100644
--- a/tests/data_files/server9-sha512.crt
+++ b/tests/data_files/server9-sha512.crt
@@ -1,20 +1,21 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server9-with-ca.crt b/tests/data_files/server9-with-ca.crt
index 0478cff..51c0ada 100644
--- a/tests/data_files/server9-with-ca.crt
+++ b/tests/data_files/server9-with-ca.crt
@@ -1,99 +1,39 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
-Certificate:
-    Data:
-        Version: 3 (0x2)
-        Serial Number: 0 (0x0)
-        Signature Algorithm: sha1WithRSAEncryption
-        Issuer: C=NL, O=PolarSSL, CN=PolarSSL Test CA
-        Validity
-            Not Before: Feb 12 14:44:00 2011 GMT
-            Not After : Feb 12 14:44:00 2021 GMT
-        Subject: C=NL, O=PolarSSL, CN=PolarSSL Test CA
-        Subject Public Key Info:
-            Public Key Algorithm: rsaEncryption
-            RSA Public Key: (2048 bit)
-                Modulus (2048 bit):
-                    00:c0:df:37:fc:17:bb:e0:96:9d:3f:86:de:96:32:
-                    7d:44:a5:16:a0:cd:21:f1:99:d4:ec:ea:cb:7c:18:
-                    58:08:94:a5:ec:9b:c5:8b:df:1a:1e:99:38:99:87:
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-                    e8:b9:72:51:c5:ce:a3:30:52:a9:f2:e7:40:70:14:
-                    cb:44:a2:72:0b:c2:e5:40:f9:3e:e5:a6:0e:b3:f9:
-                    ec:4a:63:c0:b8:29:00:74:9c:57:3b:a8:a5:04:90:
-                    71:f1:bd:83:d9:3f:d6:a5:e2:3c:2a:8f:ef:27:60:
-                    c3:c6:9f:cb:ba:ec:60:7d:b7:e6:84:32:be:4f:fb:
-                    58:26:22:03:5b:d4:b4:d5:fb:f5:e3:96:2e:70:c0:
-                    e4:2e:bd:fc:2e:ee:e2:41:55:c0:34:2e:7d:24:72:
-                    69:cb:47:b1:14:40:83:7d:67:f4:86:f6:31:ab:f1:
-                    79:a4:b2:b5:2e:12:f9:84:17:f0:62:6f:27:3e:13:
-                    58:b1:54:0d:21:9a:73:37:a1:30:cf:6f:92:dc:f6:
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-                    ab:e9:c3:f2:cf:87:96:8f:80:02:32:9e:99:58:6f:
-                    a2:d5
-                Exponent: 65537 (0x10001)
-        X509v3 extensions:
-            X509v3 Basic Constraints: 
-                CA:TRUE
-            X509v3 Subject Key Identifier: 
-                B4:5A:E4:A5:B3:DE:D2:52:F6:B9:D5:A6:95:0F:EB:3E:BC:C7:FD:FF
-            X509v3 Authority Key Identifier: 
-                keyid:B4:5A:E4:A5:B3:DE:D2:52:F6:B9:D5:A6:95:0F:EB:3E:BC:C7:FD:FF
-                DirName:/C=NL/O=PolarSSL/CN=PolarSSL Test CA
-                serial:00
-
-    Signature Algorithm: sha1WithRSAEncryption
-        b8:fd:54:d8:00:54:90:8b:25:b0:27:dd:95:cd:a2:f7:84:07:
-        1d:87:89:4a:c4:78:11:d8:07:b5:d7:22:50:8e:48:eb:62:7a:
-        32:89:be:63:47:53:ff:b6:be:f1:2e:8c:54:c0:99:3f:a0:b9:
-        37:23:72:5f:0d:46:59:8f:d8:47:cd:97:4c:9f:07:0c:12:62:
-        09:3a:24:e4:36:d9:e9:2c:da:38:d0:73:75:61:d7:c1:6c:26:
-        8b:9b:e0:d5:dc:67:ed:8c:6b:33:d7:74:22:3c:4c:db:b5:8d:
-        2a:ce:2c:0d:08:59:05:09:05:a6:39:9f:b3:67:1b:e2:83:e5:
-        e1:8f:53:f6:67:93:c7:f9:6f:76:44:58:12:e8:3a:d4:97:e7:
-        e9:c0:3e:a8:7a:72:3d:87:53:1f:e5:2c:84:84:e7:9a:9e:7f:
-        66:d9:1f:9b:f5:13:48:b0:4d:14:d1:de:b2:24:d9:78:7d:f5:
-        35:cc:58:19:d1:d2:99:ef:4d:73:f8:1f:89:d4:5a:d0:52:ce:
-        09:f5:b1:46:51:6a:00:8e:3b:cc:6f:63:01:00:99:ed:9d:a6:
-        08:60:cd:32:18:d0:73:e0:58:71:d9:e5:d2:53:d7:8d:d0:ca:
-        e9:5d:2a:0a:0d:5d:55:ec:21:50:17:16:e6:06:4a:cd:5e:de:
-        f7:e0:e9:54
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/server9.crt b/tests/data_files/server9.crt
index a6f9fbc..26567ae 100644
--- a/tests/data_files/server9.crt
+++ b/tests/data_files/server9.crt
@@ -1,19 +1,19 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/tests/data_files/test-ca-v1.crt b/tests/data_files/test-ca-v1.crt
index e5a3b1c..2f10f6d 100644
--- a/tests/data_files/test-ca-v1.crt
+++ b/tests/data_files/test-ca-v1.crt
@@ -1,19 +1,19 @@
 -----BEGIN CERTIFICATE-----
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+mdTs6st8GFgIlKXsm8WL3xoemTiZhx57wI053zhdcHgH057Zk+i5clHFzqMwUqny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 -----END CERTIFICATE-----
diff --git a/tests/data_files/test-ca.opensslconf b/tests/data_files/test-ca.opensslconf
index ff3e4c4..f03f5fd 100644
--- a/tests/data_files/test-ca.opensslconf
+++ b/tests/data_files/test-ca.opensslconf
@@ -38,6 +38,11 @@
 [multiple_san]
 subjectAltName=@alt_names
 
+[ext_multi_nocn]
+basicConstraints = CA:false
+keyUsage = digitalSignature, nonRepudiation, keyEncipherment
+subjectAltName = DNS:www.shotokan-braunschweig.de,DNS:www.massimo-abate.eu,IP:192.168.1.1,IP:192.168.69.144
+
 [hw_module_name]
 hwtype = OID:1.3.6.1.4.1.17.3
 hwserial = OCT:123456
diff --git a/tests/data_files/test-ca2.ku-crl.crt b/tests/data_files/test-ca2.ku-crl.crt
index 4fb4083..303a2c0 100644
--- a/tests/data_files/test-ca2.ku-crl.crt
+++ b/tests/data_files/test-ca2.ku-crl.crt
@@ -1,12 +1,12 @@
 -----BEGIN CERTIFICATE-----
-MIIBzDCCAVOgAwIBAgIJAP6mZLzh0IPSMAoGCCqGSM49BAMCMD4xCzAJBgNVBAYT
-Ak5MMREwDwYDVQQKEwhQb2xhclNTTDEcMBoGA1UEAxMTUG9sYXJzc2wgVGVzdCBF
-QyBDQTAeFw0xNDA0MDkxMTIzMzhaFw0yNDA0MDYxMTIzMzhaMD4xCzAJBgNVBAYT
-Ak5MMREwDwYDVQQKEwhQb2xhclNTTDEcMBoGA1UEAxMTUG9sYXJzc2wgVGVzdCBF
-QyBDQTB2MBAGByqGSM49AgEGBSuBBAAiA2IABMPaKzRBN1gvh1b+/Im6KUNLTuBu
-ww5XUzM5WNRStJGVOQsj318XJGJI/BqVKc4sLYfCiFKAr9ZqqyHduNMcbli4yuiy
-aY7zQa0pw7RfdadHb9UZKVVpmlM7ILRmFmAzHqMdMBswDAYDVR0TBAUwAwEB/zAL
-BgNVHQ8EBAMCAQIwCgYIKoZIzj0EAwIDZwAwZAIwZOCKY0EHXYzI4cQsFnfOrxm1
-ufvNeZ4ZcSZWrkTBazW2OBCuCP9SLznec3SFOUvvAjAKe/qycfxkHivjieCEG1Kt
-m2D4QKSJELUhTHr4zdkeqbzgui0y3iouaoyWsKvetNg=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=
 -----END CERTIFICATE-----
diff --git a/tests/data_files/test-ca2.ku-crl.crt.openssl.v3_ext b/tests/data_files/test-ca2.ku-crl.crt.openssl.v3_ext
new file mode 100644
index 0000000..4bc5d3c
--- /dev/null
+++ b/tests/data_files/test-ca2.ku-crl.crt.openssl.v3_ext
@@ -0,0 +1,4 @@
+basicConstraints = CA:true
+subjectKeyIdentifier=none
+keyUsage = cRLSign
+
diff --git a/tests/data_files/test-ca2.ku-crt.crt b/tests/data_files/test-ca2.ku-crt.crt
index edacc64..5cad7b2 100644
--- a/tests/data_files/test-ca2.ku-crt.crt
+++ b/tests/data_files/test-ca2.ku-crt.crt
@@ -1,12 +1,12 @@
 -----BEGIN CERTIFICATE-----
-MIIBzTCCAVOgAwIBAgIJAODh6PAeD9/vMAoGCCqGSM49BAMCMD4xCzAJBgNVBAYT
-Ak5MMREwDwYDVQQKEwhQb2xhclNTTDEcMBoGA1UEAxMTUG9sYXJzc2wgVGVzdCBF
-QyBDQTAeFw0xNDA0MDkxMTIzNTRaFw0yNDA0MDYxMTIzNTRaMD4xCzAJBgNVBAYT
-Ak5MMREwDwYDVQQKEwhQb2xhclNTTDEcMBoGA1UEAxMTUG9sYXJzc2wgVGVzdCBF
-QyBDQTB2MBAGByqGSM49AgEGBSuBBAAiA2IABMPaKzRBN1gvh1b+/Im6KUNLTuBu
-ww5XUzM5WNRStJGVOQsj318XJGJI/BqVKc4sLYfCiFKAr9ZqqyHduNMcbli4yuiy
-aY7zQa0pw7RfdadHb9UZKVVpmlM7ILRmFmAzHqMdMBswDAYDVR0TBAUwAwEB/zAL
-BgNVHQ8EBAMCAgQwCgYIKoZIzj0EAwIDaAAwZQIwGGlbynd1jU3WkUx6Irhk9Lob
-z2B+1eIO6+eu3En8B3rh8Ipfxo0e0hpfaRFYP1MUAjEAjxxBchRWJAzZ6/47Wg/7
-UoasRINgP5B/uJhTnftS1bqyuWHastb4LW5/YLOvPbMQ
+MIIB2DCCAV6gAwIBAgIUYDcYIJ6EBbKafKeXLgPLE+RsJZowCgYIKoZIzj0EAwIw
+PjELMAkGA1UEBhMCTkwxETAPBgNVBAoMCFBvbGFyU1NMMRwwGgYDVQQDDBNQb2xh
+cnNzbCBUZXN0IEVDIENBMB4XDTIzMDUxMjEwMzEwNVoXDTMzMDUxMjEwMzEwNVow
+PjELMAkGA1UEBhMCTkwxETAPBgNVBAoMCFBvbGFyU1NMMRwwGgYDVQQDDBNQb2xh
+cnNzbCBUZXN0IEVDIENBMHYwEAYHKoZIzj0CAQYFK4EEACIDYgAEw9orNEE3WC+H
+Vv78ibopQ0tO4G7DDldTMzlY1FK0kZU5CyPfXxckYkj8GpUpziwth8KIUoCv1mqr
+Id240xxuWLjK6LJpjvNBrSnDtF91p0dv1RkpVWmaUzsgtGYWYDMeox0wGzAMBgNV
+HRMEBTADAQH/MAsGA1UdDwQEAwICBDAKBggqhkjOPQQDAgNoADBlAjBwsfyYiZB6
+PpDgIbYRbZ4VT9GGFNE3L4C1IH8RNwzvywLvQfVp3ocRAkzEoRpmKAsCMQDOGm48
+d7zKl7IzmBuOWXYlukWDDWwpNI67z7g0JawfypKIxcPTZFiQXVtDdTdkrGY=
 -----END CERTIFICATE-----
diff --git a/tests/data_files/test-ca2.ku-crt.crt.openssl.v3_ext b/tests/data_files/test-ca2.ku-crt.crt.openssl.v3_ext
new file mode 100644
index 0000000..997c893
--- /dev/null
+++ b/tests/data_files/test-ca2.ku-crt.crt.openssl.v3_ext
@@ -0,0 +1,4 @@
+basicConstraints = CA:true
+subjectKeyIdentifier=none
+keyUsage = keyCertSign
+
diff --git a/tests/data_files/test-ca2.ku-crt_crl.crt b/tests/data_files/test-ca2.ku-crt_crl.crt
index ac74e40..4c69582 100644
--- a/tests/data_files/test-ca2.ku-crt_crl.crt
+++ b/tests/data_files/test-ca2.ku-crt_crl.crt
@@ -1,12 +1,12 @@
 -----BEGIN CERTIFICATE-----
-MIIBzDCCAVOgAwIBAgIJAPejOupCJS65MAoGCCqGSM49BAMCMD4xCzAJBgNVBAYT
-Ak5MMREwDwYDVQQKEwhQb2xhclNTTDEcMBoGA1UEAxMTUG9sYXJzc2wgVGVzdCBF
-QyBDQTAeFw0xNDA0MDkxMTIyMjVaFw0yNDA0MDYxMTIyMjVaMD4xCzAJBgNVBAYT
-Ak5MMREwDwYDVQQKEwhQb2xhclNTTDEcMBoGA1UEAxMTUG9sYXJzc2wgVGVzdCBF
-QyBDQTB2MBAGByqGSM49AgEGBSuBBAAiA2IABMPaKzRBN1gvh1b+/Im6KUNLTuBu
-ww5XUzM5WNRStJGVOQsj318XJGJI/BqVKc4sLYfCiFKAr9ZqqyHduNMcbli4yuiy
-aY7zQa0pw7RfdadHb9UZKVVpmlM7ILRmFmAzHqMdMBswDAYDVR0TBAUwAwEB/zAL
-BgNVHQ8EBAMCAQYwCgYIKoZIzj0EAwIDZwAwZAIwMKLVXB4YBQ0Ha4dEvFPcJtau
-TS5Vd4UqG3xQ10YcJogweuqaGHSFgdnEUfoX+4p5AjApMnYXFfUjSmlyfJmTaswO
-gaR5sUnnw33NA9j1ercem3asCYz6a8T0zo8/rR33XVU=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 -----END CERTIFICATE-----
diff --git a/tests/data_files/test-ca2.ku-crt_crl.crt.openssl.v3_ext b/tests/data_files/test-ca2.ku-crt_crl.crt.openssl.v3_ext
new file mode 100644
index 0000000..0fd73a2
--- /dev/null
+++ b/tests/data_files/test-ca2.ku-crt_crl.crt.openssl.v3_ext
@@ -0,0 +1,4 @@
+basicConstraints = CA:true
+subjectKeyIdentifier=none
+keyUsage = keyCertSign, cRLSign
+
diff --git a/tests/data_files/test-ca2.ku-ds.crt b/tests/data_files/test-ca2.ku-ds.crt
index c28e17b..2907aa7 100644
--- a/tests/data_files/test-ca2.ku-ds.crt
+++ b/tests/data_files/test-ca2.ku-ds.crt
@@ -1,12 +1,12 @@
 -----BEGIN CERTIFICATE-----
-MIIBzDCCAVOgAwIBAgIJAPOkPR3wsvm5MAoGCCqGSM49BAMCMD4xCzAJBgNVBAYT
-Ak5MMREwDwYDVQQKEwhQb2xhclNTTDEcMBoGA1UEAxMTUG9sYXJzc2wgVGVzdCBF
-QyBDQTAeFw0xNDA0MDkxMTI0MTNaFw0yNDA0MDYxMTI0MTNaMD4xCzAJBgNVBAYT
-Ak5MMREwDwYDVQQKEwhQb2xhclNTTDEcMBoGA1UEAxMTUG9sYXJzc2wgVGVzdCBF
-QyBDQTB2MBAGByqGSM49AgEGBSuBBAAiA2IABMPaKzRBN1gvh1b+/Im6KUNLTuBu
-ww5XUzM5WNRStJGVOQsj318XJGJI/BqVKc4sLYfCiFKAr9ZqqyHduNMcbli4yuiy
-aY7zQa0pw7RfdadHb9UZKVVpmlM7ILRmFmAzHqMdMBswDAYDVR0TBAUwAwEB/zAL
-BgNVHQ8EBAMCB4AwCgYIKoZIzj0EAwIDZwAwZAIwGRCmU/rWNjW13g8ITuq3pMXb
-jgwTFJHVlbMDiFJwUrRvytPV9doJOfzJ8nAQ0cZ1AjAbJ8QAV2e+DmYZpWc/p6Ug
-nQdac59ev+lH+ju6wET3jNDjUthUPrdgqa54+UWQ5r4=
+MIIB2TCCAV6gAwIBAgIUb5xsO6FEmAz+XpGFHpW7ODFvup0wCgYIKoZIzj0EAwIw
+PjELMAkGA1UEBhMCTkwxETAPBgNVBAoMCFBvbGFyU1NMMRwwGgYDVQQDDBNQb2xh
+cnNzbCBUZXN0IEVDIENBMB4XDTIzMDUxNzA3MTAzN1oXDTMzMDUxNzA3MTAzN1ow
+PjELMAkGA1UEBhMCTkwxETAPBgNVBAoMCFBvbGFyU1NMMRwwGgYDVQQDDBNQb2xh
+cnNzbCBUZXN0IEVDIENBMHYwEAYHKoZIzj0CAQYFK4EEACIDYgAEw9orNEE3WC+H
+Vv78ibopQ0tO4G7DDldTMzlY1FK0kZU5CyPfXxckYkj8GpUpziwth8KIUoCv1mqr
+Id240xxuWLjK6LJpjvNBrSnDtF91p0dv1RkpVWmaUzsgtGYWYDMeox0wGzAMBgNV
+HRMEBTADAQH/MAsGA1UdDwQEAwIHgDAKBggqhkjOPQQDAgNpADBmAjEA44HVvGYv
+meA3SpaNJmubLKjsQlGNnEUUo1IO0NBP5yWG0dRFkX8NQ0bzH/1n6FJcAjEAm9wj
+xdmEPUr6PY54c0IQJNeeF76L1/+EszXrSDQ7TLv1YC4d4uMNmqwR9EGuUX+/
 -----END CERTIFICATE-----
diff --git a/tests/data_files/test-ca2.ku-ds.crt.openssl.v3_ext b/tests/data_files/test-ca2.ku-ds.crt.openssl.v3_ext
new file mode 100644
index 0000000..08e49d4
--- /dev/null
+++ b/tests/data_files/test-ca2.ku-ds.crt.openssl.v3_ext
@@ -0,0 +1,4 @@
+basicConstraints = CA:true
+subjectKeyIdentifier=none
+keyUsage = digitalSignature
+
diff --git a/tests/include/test/macros.h b/tests/include/test/macros.h
index 95bca23..750fe33 100644
--- a/tests/include/test/macros.h
+++ b/tests/include/test/macros.h
@@ -71,6 +71,16 @@
         }                                                    \
     } while (0)
 
+/** This macro asserts fails the test with given output message.
+ *
+ * \param   MESSAGE The message to be outputed on assertion
+ */
+#define TEST_FAIL(MESSAGE)                           \
+    do {                                                  \
+        mbedtls_test_fail(MESSAGE, __LINE__, __FILE__);   \
+        goto exit;                                        \
+    } while (0)
+
 /** Evaluate two integer expressions and fail the test case if they have
  * different values.
  *
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 73aa292..5cbf19e 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -175,6 +175,10 @@
     : ${ARMC6_BIN_DIR:=/usr/bin}
     : ${ARM_NONE_EABI_GCC_PREFIX:=arm-none-eabi-}
     : ${ARM_LINUX_GNUEABI_GCC_PREFIX:=arm-linux-gnueabi-}
+    : ${CLANG_LATEST:="clang-latest"}
+    : ${CLANG_EARLIEST:="clang-earliest"}
+    : ${GCC_LATEST:="gcc-latest"}
+    : ${GCC_EARLIEST:="gcc-earliest"}
 
     # if MAKEFLAGS is not set add the -j option to speed up invocations of make
     if [ -z "${MAKEFLAGS+set}" ]; then
@@ -188,11 +192,13 @@
     # default to -O2, use -Ox _after_ this if you want another level
     ASAN_CFLAGS='-O2 -Werror -fsanitize=address,undefined -fno-sanitize-recover=all'
 
+    # Platform tests have an allocation that returns null
+    export ASAN_OPTIONS="allocator_may_return_null=1"
+    export MSAN_OPTIONS="allocator_may_return_null=1"
+
     # Gather the list of available components. These are the functions
     # defined in this script whose name starts with "component_".
-    # Parse the script with sed. This way we get the functions in the order
-    # they are defined.
-    ALL_COMPONENTS=$(sed -n 's/^ *component_\([0-9A-Z_a-z]*\) *().*/\1/p' <"$0")
+    ALL_COMPONENTS=$(compgen -A function component_ | sed 's/component_//')
 
     # Exclude components that are not supported on this platform.
     SUPPORTED_COMPONENTS=
@@ -274,6 +280,10 @@
 Tool path options:
      --armc5-bin-dir=<ARMC5_bin_dir_path>       ARM Compiler 5 bin directory.
      --armc6-bin-dir=<ARMC6_bin_dir_path>       ARM Compiler 6 bin directory.
+     --clang-earliest=<Clang_earliest_path>     Earliest version of clang available
+     --clang-latest=<Clang_latest_path>         Latest version of clang available
+     --gcc-earliest=<GCC_earliest_path>         Earliest version of GCC available
+     --gcc-latest=<GCC_latest_path>             Latest version of GCC available
      --gnutls-cli=<GnuTLS_cli_path>             GnuTLS client executable to use for most tests.
      --gnutls-serv=<GnuTLS_serv_path>           GnuTLS server executable to use for most tests.
      --gnutls-legacy-cli=<GnuTLS_cli_path>      GnuTLS client executable to use for legacy tests.
@@ -417,9 +427,13 @@
             --armcc) no_armcc=;;
             --armc5-bin-dir) shift; ARMC5_BIN_DIR="$1";;
             --armc6-bin-dir) shift; ARMC6_BIN_DIR="$1";;
+            --clang-earliest) shift; CLANG_EARLIEST="$1";;
+            --clang-latest) shift; CLANG_LATEST="$1";;
             --error-test) error_test=$((error_test + 1));;
             --except) all_except=1;;
             --force|-f) FORCE=1;;
+            --gcc-earliest) shift; GCC_EARLIEST="$1";;
+            --gcc-latest) shift; GCC_LATEST="$1";;
             --gnutls-cli) shift; GNUTLS_CLI="$1";;
             --gnutls-legacy-cli) shift; GNUTLS_LEGACY_CLI="$1";;
             --gnutls-legacy-serv) shift; GNUTLS_LEGACY_SERV="$1";;
@@ -2946,6 +2960,7 @@
 
 test_build_opt () {
     info=$1 cc=$2; shift 2
+    $cc --version
     for opt in "$@"; do
           msg "build/test: $cc $opt, $info" # ~ 30s
           make CC="$cc" CFLAGS="$opt -std=c99 -pedantic -Wall -Wextra -Werror"
@@ -2958,14 +2973,45 @@
     done
 }
 
-component_test_clang_opt () {
+# For FreeBSD we invoke the function by name so this condition is added
+# to disable the existing test_clang_opt function for linux.
+if [[ $(uname) != "Linux" ]]; then
+    component_test_clang_opt () {
+        scripts/config.py full
+        test_build_opt 'full config' clang -O0 -Os -O2
+    }
+fi
+
+component_test_clang_latest_opt () {
     scripts/config.py full
-    test_build_opt 'full config' clang -O0 -Os -O2
+    test_build_opt 'full config' "$CLANG_LATEST" -O0 -Os -O2
+}
+support_test_clang_latest_opt () {
+    type "$CLANG_LATEST" >/dev/null 2>/dev/null
 }
 
-component_test_gcc_opt () {
+component_test_clang_earliest_opt () {
     scripts/config.py full
-    test_build_opt 'full config' gcc -O0 -Os -O2
+    test_build_opt 'full config' "$CLANG_EARLIEST" -O0
+}
+support_test_clang_earliest_opt () {
+    type "$CLANG_EARLIEST" >/dev/null 2>/dev/null
+}
+
+component_test_gcc_latest_opt () {
+    scripts/config.py full
+    test_build_opt 'full config' "$GCC_LATEST" -O0 -Os -O2
+}
+support_test_gcc_latest_opt () {
+    type "$GCC_LATEST" >/dev/null 2>/dev/null
+}
+
+component_test_gcc_earliest_opt () {
+    scripts/config.py full
+    test_build_opt 'full config' "$GCC_EARLIEST" -O0
+}
+support_test_gcc_earliest_opt () {
+    type "$GCC_EARLIEST" >/dev/null 2>/dev/null
 }
 
 component_build_mbedtls_config_file () {
diff --git a/tests/scripts/generate_test_code.py b/tests/scripts/generate_test_code.py
index 839fccd..ed78449 100755
--- a/tests/scripts/generate_test_code.py
+++ b/tests/scripts/generate_test_code.py
@@ -654,6 +654,11 @@
     code = code.replace(name, 'test_' + name, 1)
     name = 'test_' + name
 
+    # If a test function has no arguments then add 'void' argument to
+    # avoid "-Wstrict-prototypes" warnings from clang
+    if len(args) == 0:
+        code = code.replace('()', '(void)', 1)
+
     for line in funcs_f:
         if re.search(END_CASE_REGEX, line):
             break
diff --git a/tests/scripts/test_generate_test_code.py b/tests/scripts/test_generate_test_code.py
index fe748ae..b32d184 100755
--- a/tests/scripts/test_generate_test_code.py
+++ b/tests/scripts/test_generate_test_code.py
@@ -647,7 +647,7 @@
         self.assertEqual(arg, [])
         expected = '''#line 1 "test_suite_ut.function"
 
-void test_func()
+void test_func(void)
 {
     ba ba black sheep
     have you any wool
@@ -690,7 +690,7 @@
 
         expected = '''#line 1 "test_suite_ut.function"
 
-void test_func()
+void test_func(void)
 {
     ba ba black sheep
     have you any wool
@@ -750,7 +750,7 @@
 void
 
 
-test_func()
+test_func(void)
 {
     ba ba black sheep
     have you any wool
@@ -803,7 +803,7 @@
 
 
 
-void test_func()
+void test_func(void)
 {
     ba ba black sheep
     have you any wool
@@ -1139,7 +1139,7 @@
 #if defined(MBEDTLS_ENTROPY_NV_SEED)
 #if defined(MBEDTLS_FS_IO)
 #line 13 "test_suite_ut.function"
-void test_func1()
+void test_func1(void)
 {
 exit:
     ;
@@ -1156,7 +1156,7 @@
 #if defined(MBEDTLS_ENTROPY_NV_SEED)
 #if defined(MBEDTLS_FS_IO)
 #line 19 "test_suite_ut.function"
-void test_func2()
+void test_func2(void)
 {
 exit:
     ;
diff --git a/tests/src/psa_exercise_key.c b/tests/src/psa_exercise_key.c
index 6b73486..f8ed784 100644
--- a/tests/src/psa_exercise_key.c
+++ b/tests/src/psa_exercise_key.c
@@ -308,7 +308,7 @@
             hash_alg = KNOWN_MBEDTLS_SUPPORTED_HASH_ALG;
             alg ^= PSA_ALG_ANY_HASH ^ hash_alg;
     #else
-            TEST_ASSERT(!"No hash algorithm for hash-and-sign testing");
+            TEST_FAIL("No hash algorithm for hash-and-sign testing");
     #endif
         }
 
@@ -437,7 +437,7 @@
                                                   PSA_KEY_DERIVATION_INPUT_LABEL,
                                                   input2, input2_length));
     } else {
-        TEST_ASSERT(!"Key derivation algorithm not supported");
+        TEST_FAIL("Key derivation algorithm not supported");
     }
 
     if (capacity != SIZE_MAX) {
@@ -767,7 +767,7 @@
 
     {
         (void) exported;
-        TEST_ASSERT(!"Sanity check not implemented for this key type");
+        TEST_FAIL("Sanity check not implemented for this key type");
     }
 
 #if defined(MBEDTLS_DES_C)
@@ -912,7 +912,7 @@
     } else if (PSA_ALG_IS_KEY_AGREEMENT(alg)) {
         ok = exercise_key_agreement_key(key, usage, alg);
     } else {
-        TEST_ASSERT(!"No code to exercise this category of algorithm");
+        TEST_FAIL("No code to exercise this category of algorithm");
     }
 
     ok = ok && exercise_export_key(key, usage);
diff --git a/tests/src/test_helpers/ssl_helpers.c b/tests/src/test_helpers/ssl_helpers.c
index bc9a204..bd1f46c 100644
--- a/tests/src/test_helpers/ssl_helpers.c
+++ b/tests/src/test_helpers/ssl_helpers.c
@@ -806,13 +806,15 @@
                                int *written,
                                const int expected_fragments)
 {
+    int ret;
+
     /* Verify that calling mbedtls_ssl_write with a NULL buffer and zero length is
      * a valid no-op for TLS connections. */
     if (ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM) {
         TEST_ASSERT(mbedtls_ssl_write(ssl, NULL, 0) == 0);
     }
 
-    int ret = mbedtls_ssl_write(ssl, buf + *written, buf_len - *written);
+    ret = mbedtls_ssl_write(ssl, buf + *written, buf_len - *written);
     if (ret > 0) {
         *written += ret;
     }
@@ -852,13 +854,15 @@
                               int *read, int *fragments,
                               const int expected_fragments)
 {
+    int ret;
+
     /* Verify that calling mbedtls_ssl_write with a NULL buffer and zero length is
      * a valid no-op for TLS connections. */
     if (ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM) {
         TEST_ASSERT(mbedtls_ssl_read(ssl, NULL, 0) == 0);
     }
 
-    int ret = mbedtls_ssl_read(ssl, buf + *read, buf_len - *read);
+    ret = mbedtls_ssl_read(ssl, buf + *read, buf_len - *read);
     if (ret > 0) {
         (*fragments)++;
         *read += ret;
diff --git a/tests/suites/test_suite_asn1write.function b/tests/suites/test_suite_asn1write.function
index 06b9edf..81e3c12 100644
--- a/tests/suites/test_suite_asn1write.function
+++ b/tests/suites/test_suite_asn1write.function
@@ -316,7 +316,7 @@
                 buf_complete[data_len + 2] = (unsigned char) (expected_params_len >> 8);
                 buf_complete[data_len + 3] = (unsigned char) (expected_params_len);
             } else {
-                TEST_ASSERT(!"Bad test data: invalid length of ASN.1 element");
+                TEST_FAIL("Bad test data: invalid length of ASN.1 element");
             }
             unsigned char *p = buf_complete;
             TEST_EQUAL(mbedtls_asn1_get_alg(&p, end_complete,
diff --git a/tests/suites/test_suite_debug.data b/tests/suites/test_suite_debug.data
index 0092774..87ec67c 100644
--- a/tests/suites/test_suite_debug.data
+++ b/tests/suites/test_suite_debug.data
@@ -65,3 +65,6 @@
 Debug print certificate #2 (EC)
 depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_BASE64_C:MBEDTLS_ECDSA_C:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_SHA256_C
 mbedtls_debug_print_crt:"data_files/test-ca2.crt":"MyFile":999:"PREFIX_":"MyFile(0999)\: PREFIX_ #1\:\nMyFile(0999)\: cert. version     \: 3\nMyFile(0999)\: serial number     \: C1\:43\:E2\:7E\:62\:43\:CC\:E8\nMyFile(0999)\: issuer name       \: C=NL, O=PolarSSL, CN=Polarssl Test EC CA\nMyFile(0999)\: subject name      \: C=NL, O=PolarSSL, CN=Polarssl Test EC CA\nMyFile(0999)\: issued  on        \: 2019-02-10 14\:44\:00\nMyFile(0999)\: expires on        \: 2029-02-10 14\:44\:00\nMyFile(0999)\: signed using      \: ECDSA with SHA256\nMyFile(0999)\: EC key size       \: 384 bits\nMyFile(0999)\: basic constraints \: CA=true\nMyFile(0999)\: value of 'crt->eckey.Q(X)' (384 bits) is\:\nMyFile(0999)\:  c3 da 2b 34 41 37 58 2f 87 56 fe fc 89 ba 29 43\nMyFile(0999)\:  4b 4e e0 6e c3 0e 57 53 33 39 58 d4 52 b4 91 95\nMyFile(0999)\:  39 0b 23 df 5f 17 24 62 48 fc 1a 95 29 ce 2c 2d\nMyFile(0999)\: value of 'crt->eckey.Q(Y)' (384 bits) is\:\nMyFile(0999)\:  87 c2 88 52 80 af d6 6a ab 21 dd b8 d3 1c 6e 58\nMyFile(0999)\:  b8 ca e8 b2 69 8e f3 41 ad 29 c3 b4 5f 75 a7 47\nMyFile(0999)\:  6f d5 19 29 55 69 9a 53 3b 20 b4 66 16 60 33 1e\n"
+
+Check mbedtls_calloc overallocation
+check_mbedtls_calloc_overallocation:1:1
diff --git a/tests/suites/test_suite_debug.function b/tests/suites/test_suite_debug.function
index 4e85d62..9ece280 100644
--- a/tests/suites/test_suite_debug.function
+++ b/tests/suites/test_suite_debug.function
@@ -205,3 +205,17 @@
     USE_PSA_DONE();
 }
 /* END_CASE */
+
+/* BEGIN_CASE */
+void check_mbedtls_calloc_overallocation(int num, int size)
+{
+    unsigned char *buf;
+    buf = mbedtls_calloc((size_t) num * SIZE_MAX/2, (size_t) size * SIZE_MAX/2);
+    /* Dummy usage of the pointer to prevent optimizing it */
+    mbedtls_printf("calloc pointer : %p\n", buf);
+    TEST_ASSERT(buf == NULL);
+
+exit:
+    mbedtls_free(buf);
+}
+/* END_CASE */
diff --git a/tests/suites/test_suite_psa_crypto.function b/tests/suites/test_suite_psa_crypto.function
index 5bd7b36..c457cdf 100644
--- a/tests/suites/test_suite_psa_crypto.function
+++ b/tests/suites/test_suite_psa_crypto.function
@@ -5577,7 +5577,7 @@
             break;
 
         default:
-            TEST_ASSERT(!"generation_method not implemented in test");
+            TEST_FAIL("generation_method not implemented in test");
             break;
     }
     psa_reset_key_attributes(&attributes);
diff --git a/tests/suites/test_suite_psa_crypto_se_driver_hal.function b/tests/suites/test_suite_psa_crypto_se_driver_hal.function
index aeced54..513dd87 100644
--- a/tests/suites/test_suite_psa_crypto_se_driver_hal.function
+++ b/tests/suites/test_suite_psa_crypto_se_driver_hal.function
@@ -1321,7 +1321,7 @@
             key_management.p_export_public = ram_export_public;
             break;
         default:
-            TEST_ASSERT(!"unsupported flow (should be SIGN_IN_xxx)");
+            TEST_FAIL("unsupported flow (should be SIGN_IN_xxx)");
             break;
     }
     asymmetric.p_verify = ram_verify;
diff --git a/tests/suites/test_suite_psa_crypto_slot_management.function b/tests/suites/test_suite_psa_crypto_slot_management.function
index e3bb0d3..905be03 100644
--- a/tests/suites/test_suite_psa_crypto_slot_management.function
+++ b/tests/suites/test_suite_psa_crypto_slot_management.function
@@ -775,7 +775,7 @@
                 mbedtls_svc_key_id_make(0, PSA_KEY_ID_VENDOR_MAX + 1);
             break;
         default:
-            TEST_ASSERT(!"unknown handle construction");
+            TEST_FAIL("unknown handle construction");
     }
 
     /* Attempt to use the invalid handle. */
diff --git a/tests/suites/test_suite_version.data b/tests/suites/test_suite_version.data
index 4b57192..8226a68 100644
--- a/tests/suites/test_suite_version.data
+++ b/tests/suites/test_suite_version.data
@@ -1,8 +1,8 @@
 Check compile time library version
-check_compiletime_version:"2.28.3"
+check_compiletime_version:"2.28.4"
 
 Check runtime library version
-check_runtime_version:"2.28.3"
+check_runtime_version:"2.28.4"
 
 Check for MBEDTLS_VERSION_C
 check_feature:"MBEDTLS_VERSION_C":0
diff --git a/tests/suites/test_suite_x509parse.data b/tests/suites/test_suite_x509parse.data
index c796cdd..406a063 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -2890,6 +2890,14 @@
 depends_on:MBEDTLS_SHA256_C:MBEDTLS_RSA_C
 mbedtls_x509_crt_parse_file:"data_files/parse_input/cli-rsa-sha256-badalg.crt.der":MBEDTLS_ERR_X509_SIG_MISMATCH:0
 
+X509 File parse (does not conform to RFC 5480 / RFC 5758 - AlgorithmIdentifier's parameters field is present, mbedTLS generated before bugfix, OK)
+depends_on:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_SHA256_C
+x509parse_crt_file:"data_files/parse_input/server5-non-compliant.crt":0
+
+X509 File parse (conforms to RFC 5480 / RFC 5758 - AlgorithmIdentifier's parameters field must be absent for ECDSA)
+depends_on:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_SHA256_C
+x509parse_crt_file:"data_files/parse_input/server5.crt":0
+
 X509 Get time (UTC no issues)
 depends_on:MBEDTLS_X509_USE_C
 x509_get_time:MBEDTLS_ASN1_UTC_TIME:"500101000000Z":0:1950:1:1:0:0:0