diff --git a/programs/.gitignore b/programs/.gitignore
index d19162d..30489be 100644
--- a/programs/.gitignore
+++ b/programs/.gitignore
@@ -9,9 +9,7 @@
 hash/md5sum
 hash/sha1sum
 hash/sha2sum
-pkey/dh_client
 pkey/dh_genprime
-pkey/dh_server
 pkey/ecdsa
 pkey/ecdh_curve25519
 pkey/gen_key
diff --git a/programs/Makefile b/programs/Makefile
index 1df2cb1..58358e5 100644
--- a/programs/Makefile
+++ b/programs/Makefile
@@ -49,8 +49,7 @@
 
 APPS =	aes/aescrypt2$(EXEXT)		aes/crypt_and_hash$(EXEXT)	\
 	hash/hello$(EXEXT)		hash/generic_sum$(EXEXT)	\
-					pkey/dh_client$(EXEXT)		\
-	pkey/dh_genprime$(EXEXT)	pkey/dh_server$(EXEXT)		\
+	pkey/dh_genprime$(EXEXT)					\
 	pkey/ecdh_curve25519$(EXEXT)					\
 	pkey/ecdsa$(EXEXT)		pkey/gen_key$(EXEXT)		\
 	pkey/key_app$(EXEXT)		pkey/key_app_writer$(EXEXT)	\
@@ -123,18 +122,10 @@
 	echo "  CC    hash/generic_sum.c"
 	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) hash/generic_sum.c $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
 
-pkey/dh_client$(EXEXT): pkey/dh_client.c $(DEP)
-	echo "  CC    pkey/dh_client.c"
-	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) pkey/dh_client.c   $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
-
 pkey/dh_genprime$(EXEXT): pkey/dh_genprime.c $(DEP)
 	echo "  CC    pkey/dh_genprime.c"
 	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) pkey/dh_genprime.c $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
 
-pkey/dh_server$(EXEXT): pkey/dh_server.c $(DEP)
-	echo "  CC    pkey/dh_server.c"
-	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) pkey/dh_server.c   $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
-
 pkey/ecdh_curve25519$(EXEXT): pkey/ecdh_curve25519.c $(DEP)
 	echo "  CC    pkey/ecdh_curve25519.c"
 	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) pkey/ecdh_curve25519.c   $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
diff --git a/programs/README.md b/programs/README.md
index eb25a7f..6dd7f71 100644
--- a/programs/README.md
+++ b/programs/README.md
@@ -44,8 +44,6 @@
 
 ### Diffie-Hellman key exchange examples
 
-* [`pkey/dh_client.c`](pkey/dh_client.c), [`pkey/dh_server.c`](pkey/dh_server.c): secure channel demonstrators (client, server). This pair of programs illustrates how to set up a secure channel using RSA for authentication and Diffie-Hellman to generate a shared AES session key.
-
 * [`pkey/ecdh_curve25519.c`](pkey/ecdh_curve25519.c): demonstration of a elliptic curve Diffie-Hellman (ECDH) key agreement.
 
 ### Bignum (`mpi`) usage examples
diff --git a/programs/pkey/CMakeLists.txt b/programs/pkey/CMakeLists.txt
index 5a37a42..944a100 100644
--- a/programs/pkey/CMakeLists.txt
+++ b/programs/pkey/CMakeLists.txt
@@ -1,12 +1,6 @@
-add_executable(dh_client dh_client.c)
-target_link_libraries(dh_client mbedtls)
-
 add_executable(dh_genprime dh_genprime.c)
 target_link_libraries(dh_genprime mbedtls)
 
-add_executable(dh_server dh_server.c)
-target_link_libraries(dh_server mbedtls)
-
 add_executable(ecdh_curve25519 ecdh_curve25519.c)
 target_link_libraries(ecdh_curve25519 mbedtls)
 
@@ -58,6 +52,6 @@
 add_executable(pk_decrypt pk_decrypt.c)
 target_link_libraries(pk_decrypt mbedtls)
 
-install(TARGETS dh_client dh_genprime dh_server key_app mpi_demo rsa_genkey rsa_sign rsa_verify rsa_encrypt rsa_decrypt pk_encrypt pk_decrypt pk_sign pk_verify gen_key
+install(TARGETS dh_genprime key_app mpi_demo rsa_genkey rsa_sign rsa_verify rsa_encrypt rsa_decrypt pk_encrypt pk_decrypt pk_sign pk_verify gen_key
         DESTINATION "bin"
         PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
diff --git a/programs/pkey/dh_client.c b/programs/pkey/dh_client.c
deleted file mode 100644
index 1dce31a..0000000
--- a/programs/pkey/dh_client.c
+++ /dev/null
@@ -1,325 +0,0 @@
-/*
- *  Diffie-Hellman-Merkle key exchange (client side)
- *
- *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
- *  SPDX-License-Identifier: Apache-2.0
- *
- *  Licensed under the Apache License, Version 2.0 (the "License"); you may
- *  not use this file except in compliance with the License.
- *  You may obtain a copy of the License at
- *
- *  http://www.apache.org/licenses/LICENSE-2.0
- *
- *  Unless required by applicable law or agreed to in writing, software
- *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *  See the License for the specific language governing permissions and
- *  limitations under the License.
- *
- *  This file is part of mbed TLS (https://tls.mbed.org)
- */
-
-#if !defined(MBEDTLS_CONFIG_FILE)
-#include "mbedtls/config.h"
-#else
-#include MBEDTLS_CONFIG_FILE
-#endif
-
-#if defined(MBEDTLS_PLATFORM_C)
-#include "mbedtls/platform.h"
-#else
-#include <stdio.h>
-#include <stdlib.h>
-#define mbedtls_printf          printf
-#define mbedtls_time_t          time_t
-#define mbedtls_exit            exit
-#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
-#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
-#endif /* MBEDTLS_PLATFORM_C */
-
-#if defined(MBEDTLS_AES_C) && defined(MBEDTLS_DHM_C) && \
-    defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_NET_C) && \
-    defined(MBEDTLS_RSA_C) && defined(MBEDTLS_SHA256_C) && \
-    defined(MBEDTLS_FS_IO) && defined(MBEDTLS_CTR_DRBG_C) && \
-    defined(MBEDTLS_SHA1_C)
-#include "mbedtls/net_sockets.h"
-#include "mbedtls/aes.h"
-#include "mbedtls/dhm.h"
-#include "mbedtls/rsa.h"
-#include "mbedtls/sha1.h"
-#include "mbedtls/entropy.h"
-#include "mbedtls/ctr_drbg.h"
-
-#include <stdio.h>
-#include <string.h>
-#endif
-
-#define SERVER_NAME "localhost"
-#define SERVER_PORT "11999"
-
-#if !defined(MBEDTLS_AES_C) || !defined(MBEDTLS_DHM_C) ||     \
-    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_NET_C) ||  \
-    !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_SHA256_C) ||    \
-    !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_CTR_DRBG_C) || \
-    !defined(MBEDTLS_SHA1_C)
-int main( void )
-{
-    mbedtls_printf("MBEDTLS_AES_C and/or MBEDTLS_DHM_C and/or MBEDTLS_ENTROPY_C "
-           "and/or MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
-           "MBEDTLS_SHA256_C and/or MBEDTLS_FS_IO and/or "
-           "MBEDTLS_CTR_DRBG_C not defined.\n");
-    return( 0 );
-}
-#else
-
-#if defined(MBEDTLS_CHECK_PARAMS)
-#include "mbedtls/platform_util.h"
-void mbedtls_param_failed( const char *failure_condition,
-                           const char *file,
-                           int line )
-{
-    mbedtls_printf( "%s:%i: Input param failed - %s\n",
-                    file, line, failure_condition );
-    mbedtls_exit( MBEDTLS_EXIT_FAILURE );
-}
-#endif
-
-int main( void )
-{
-    FILE *f;
-
-    int ret = 1;
-    int exit_code = MBEDTLS_EXIT_FAILURE;
-    size_t n, buflen;
-    mbedtls_net_context server_fd;
-
-    unsigned char *p, *end;
-    unsigned char buf[2048];
-    unsigned char hash[32];
-    const char *pers = "dh_client";
-
-    mbedtls_entropy_context entropy;
-    mbedtls_ctr_drbg_context ctr_drbg;
-    mbedtls_rsa_context rsa;
-    mbedtls_dhm_context dhm;
-    mbedtls_aes_context aes;
-
-    mbedtls_net_init( &server_fd );
-    mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_SHA256 );
-    mbedtls_dhm_init( &dhm );
-    mbedtls_aes_init( &aes );
-    mbedtls_ctr_drbg_init( &ctr_drbg );
-
-    /*
-     * 1. Setup the RNG
-     */
-    mbedtls_printf( "\n  . Seeding the random number generator" );
-    fflush( stdout );
-
-    mbedtls_entropy_init( &entropy );
-    if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
-                               (const unsigned char *) pers,
-                               strlen( pers ) ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_seed returned %d\n", ret );
-        goto exit;
-    }
-
-    /*
-     * 2. Read the server's public RSA key
-     */
-    mbedtls_printf( "\n  . Reading public key from rsa_pub.txt" );
-    fflush( stdout );
-
-    if( ( f = fopen( "rsa_pub.txt", "rb" ) ) == NULL )
-    {
-        mbedtls_printf( " failed\n  ! Could not open rsa_pub.txt\n" \
-                "  ! Please run rsa_genkey first\n\n" );
-        goto exit;
-    }
-
-    mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
-
-    if( ( ret = mbedtls_mpi_read_file( &rsa.N, 16, f ) ) != 0 ||
-        ( ret = mbedtls_mpi_read_file( &rsa.E, 16, f ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_mpi_read_file returned %d\n\n", ret );
-        fclose( f );
-        goto exit;
-    }
-
-    rsa.len = ( mbedtls_mpi_bitlen( &rsa.N ) + 7 ) >> 3;
-
-    fclose( f );
-
-    /*
-     * 3. Initiate the connection
-     */
-    mbedtls_printf( "\n  . Connecting to tcp/%s/%s", SERVER_NAME,
-                                             SERVER_PORT );
-    fflush( stdout );
-
-    if( ( ret = mbedtls_net_connect( &server_fd, SERVER_NAME,
-                                         SERVER_PORT, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_net_connect returned %d\n\n", ret );
-        goto exit;
-    }
-
-    /*
-     * 4a. First get the buffer length
-     */
-    mbedtls_printf( "\n  . Receiving the server's DH parameters" );
-    fflush( stdout );
-
-    memset( buf, 0, sizeof( buf ) );
-
-    if( ( ret = mbedtls_net_recv( &server_fd, buf, 2 ) ) != 2 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_net_recv returned %d\n\n", ret );
-        goto exit;
-    }
-
-    n = buflen = ( buf[0] << 8 ) | buf[1];
-    if( buflen < 1 || buflen > sizeof( buf ) )
-    {
-        mbedtls_printf( " failed\n  ! Got an invalid buffer length\n\n" );
-        goto exit;
-    }
-
-    /*
-     * 4b. Get the DHM parameters: P, G and Ys = G^Xs mod P
-     */
-    memset( buf, 0, sizeof( buf ) );
-
-    if( ( ret = mbedtls_net_recv( &server_fd, buf, n ) ) != (int) n )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_net_recv returned %d\n\n", ret );
-        goto exit;
-    }
-
-    p = buf, end = buf + buflen;
-
-    if( ( ret = mbedtls_dhm_read_params( &dhm, &p, end ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_dhm_read_params returned %d\n\n", ret );
-        goto exit;
-    }
-
-    if( dhm.len < 64 || dhm.len > 512 )
-    {
-        mbedtls_printf( " failed\n  ! Invalid DHM modulus size\n\n" );
-        goto exit;
-    }
-
-    /*
-     * 5. Check that the server's RSA signature matches
-     *    the SHA-256 hash of (P,G,Ys)
-     */
-    mbedtls_printf( "\n  . Verifying the server's RSA signature" );
-    fflush( stdout );
-
-    p += 2;
-
-    if( ( n = (size_t) ( end - p ) ) != rsa.len )
-    {
-        mbedtls_printf( " failed\n  ! Invalid RSA signature size\n\n" );
-        goto exit;
-    }
-
-    if( ( ret = mbedtls_sha1_ret( buf, (int)( p - 2 - buf ), hash ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_sha1_ret returned %d\n\n", ret );
-        goto exit;
-    }
-
-    if( ( ret = mbedtls_rsa_pkcs1_verify( &rsa, NULL, NULL, MBEDTLS_RSA_PUBLIC,
-                                  MBEDTLS_MD_SHA256, 0, hash, p ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_rsa_pkcs1_verify returned %d\n\n", ret );
-        goto exit;
-    }
-
-    /*
-     * 6. Send our public value: Yc = G ^ Xc mod P
-     */
-    mbedtls_printf( "\n  . Sending own public value to server" );
-    fflush( stdout );
-
-    n = dhm.len;
-    if( ( ret = mbedtls_dhm_make_public( &dhm, (int) dhm.len, buf, n,
-                                 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_dhm_make_public returned %d\n\n", ret );
-        goto exit;
-    }
-
-    if( ( ret = mbedtls_net_send( &server_fd, buf, n ) ) != (int) n )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_net_send returned %d\n\n", ret );
-        goto exit;
-    }
-
-    /*
-     * 7. Derive the shared secret: K = Ys ^ Xc mod P
-     */
-    mbedtls_printf( "\n  . Shared secret: " );
-    fflush( stdout );
-
-    if( ( ret = mbedtls_dhm_calc_secret( &dhm, buf, sizeof( buf ), &n,
-                                 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_dhm_calc_secret returned %d\n\n", ret );
-        goto exit;
-    }
-
-    for( n = 0; n < 16; n++ )
-        mbedtls_printf( "%02x", buf[n] );
-
-    /*
-     * 8. Setup the AES-256 decryption key
-     *
-     * This is an overly simplified example; best practice is
-     * to hash the shared secret with a random value to derive
-     * the keying material for the encryption/decryption keys,
-     * IVs and MACs.
-     */
-    mbedtls_printf( "...\n  . Receiving and decrypting the ciphertext" );
-    fflush( stdout );
-
-    mbedtls_aes_setkey_dec( &aes, buf, 256 );
-
-    memset( buf, 0, sizeof( buf ) );
-
-    if( ( ret = mbedtls_net_recv( &server_fd, buf, 16 ) ) != 16 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_net_recv returned %d\n\n", ret );
-        goto exit;
-    }
-
-    mbedtls_aes_crypt_ecb( &aes, MBEDTLS_AES_DECRYPT, buf, buf );
-    buf[16] = '\0';
-    mbedtls_printf( "\n  . Plaintext is \"%s\"\n\n", (char *) buf );
-
-    exit_code = MBEDTLS_EXIT_SUCCESS;
-
-exit:
-
-    mbedtls_net_free( &server_fd );
-
-    mbedtls_aes_free( &aes );
-    mbedtls_rsa_free( &rsa );
-    mbedtls_dhm_free( &dhm );
-    mbedtls_ctr_drbg_free( &ctr_drbg );
-    mbedtls_entropy_free( &entropy );
-
-#if defined(_WIN32)
-    mbedtls_printf( "  + Press Enter to exit this program.\n" );
-    fflush( stdout ); getchar();
-#endif
-
-    return( exit_code );
-}
-#endif /* MBEDTLS_AES_C && MBEDTLS_DHM_C && MBEDTLS_ENTROPY_C &&
-          MBEDTLS_NET_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
-          MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
diff --git a/programs/pkey/dh_server.c b/programs/pkey/dh_server.c
deleted file mode 100644
index a797e60..0000000
--- a/programs/pkey/dh_server.c
+++ /dev/null
@@ -1,348 +0,0 @@
-/*
- *  Diffie-Hellman-Merkle key exchange (server side)
- *
- *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
- *  SPDX-License-Identifier: Apache-2.0
- *
- *  Licensed under the Apache License, Version 2.0 (the "License"); you may
- *  not use this file except in compliance with the License.
- *  You may obtain a copy of the License at
- *
- *  http://www.apache.org/licenses/LICENSE-2.0
- *
- *  Unless required by applicable law or agreed to in writing, software
- *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *  See the License for the specific language governing permissions and
- *  limitations under the License.
- *
- *  This file is part of mbed TLS (https://tls.mbed.org)
- */
-
-#if !defined(MBEDTLS_CONFIG_FILE)
-#include "mbedtls/config.h"
-#else
-#include MBEDTLS_CONFIG_FILE
-#endif
-
-#if defined(MBEDTLS_PLATFORM_C)
-#include "mbedtls/platform.h"
-#else
-#include <stdio.h>
-#include <stdlib.h>
-#define mbedtls_printf          printf
-#define mbedtls_time_t          time_t
-#define mbedtls_exit            exit
-#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
-#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
-#endif /* MBEDTLS_PLATFORM_C */
-
-#if defined(MBEDTLS_AES_C) && defined(MBEDTLS_DHM_C) && \
-    defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_NET_C) && \
-    defined(MBEDTLS_RSA_C) && defined(MBEDTLS_SHA256_C) && \
-    defined(MBEDTLS_FS_IO) && defined(MBEDTLS_CTR_DRBG_C) && \
-    defined(MBEDTLS_SHA1_C)
-#include "mbedtls/net_sockets.h"
-#include "mbedtls/aes.h"
-#include "mbedtls/dhm.h"
-#include "mbedtls/rsa.h"
-#include "mbedtls/sha1.h"
-#include "mbedtls/entropy.h"
-#include "mbedtls/ctr_drbg.h"
-
-#include <stdio.h>
-#include <string.h>
-#endif
-
-#define SERVER_PORT "11999"
-#define PLAINTEXT "==Hello there!=="
-
-#if !defined(MBEDTLS_AES_C) || !defined(MBEDTLS_DHM_C) ||     \
-    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_NET_C) ||  \
-    !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_SHA256_C) ||    \
-    !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_CTR_DRBG_C) || \
-    !defined(MBEDTLS_SHA1_C)
-int main( void )
-{
-    mbedtls_printf("MBEDTLS_AES_C and/or MBEDTLS_DHM_C and/or MBEDTLS_ENTROPY_C "
-           "and/or MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
-           "MBEDTLS_SHA256_C and/or MBEDTLS_FS_IO and/or "
-           "MBEDTLS_CTR_DRBG_C not defined.\n");
-    return( 0 );
-}
-#else
-
-#if defined(MBEDTLS_CHECK_PARAMS)
-#include "mbedtls/platform_util.h"
-void mbedtls_param_failed( const char *failure_condition,
-                           const char *file,
-                           int line )
-{
-    mbedtls_printf( "%s:%i: Input param failed - %s\n",
-                    file, line, failure_condition );
-    mbedtls_exit( MBEDTLS_EXIT_FAILURE );
-}
-#endif
-
-int main( void )
-{
-    FILE *f;
-
-    int ret = 1;
-    int exit_code = MBEDTLS_EXIT_FAILURE;
-    size_t n, buflen;
-    mbedtls_net_context listen_fd, client_fd;
-
-    unsigned char buf[2048];
-    unsigned char hash[32];
-    unsigned char buf2[2];
-    const char *pers = "dh_server";
-
-    mbedtls_entropy_context entropy;
-    mbedtls_ctr_drbg_context ctr_drbg;
-    mbedtls_rsa_context rsa;
-    mbedtls_dhm_context dhm;
-    mbedtls_aes_context aes;
-
-    mbedtls_mpi N, P, Q, D, E;
-
-    mbedtls_net_init( &listen_fd );
-    mbedtls_net_init( &client_fd );
-    mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_SHA256 );
-    mbedtls_dhm_init( &dhm );
-    mbedtls_aes_init( &aes );
-    mbedtls_ctr_drbg_init( &ctr_drbg );
-
-    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
-    mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E );
-
-    /*
-     * 1. Setup the RNG
-     */
-    mbedtls_printf( "\n  . Seeding the random number generator" );
-    fflush( stdout );
-
-    mbedtls_entropy_init( &entropy );
-    if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
-                               (const unsigned char *) pers,
-                               strlen( pers ) ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_seed returned %d\n", ret );
-        goto exit;
-    }
-
-    /*
-     * 2a. Read the server's private RSA key
-     */
-    mbedtls_printf( "\n  . Reading private key from rsa_priv.txt" );
-    fflush( stdout );
-
-    if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
-    {
-        mbedtls_printf( " failed\n  ! Could not open rsa_priv.txt\n" \
-                "  ! Please run rsa_genkey first\n\n" );
-        goto exit;
-    }
-
-    mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
-
-    if( ( ret = mbedtls_mpi_read_file( &N , 16, f ) ) != 0 ||
-        ( ret = mbedtls_mpi_read_file( &E , 16, f ) ) != 0 ||
-        ( ret = mbedtls_mpi_read_file( &D , 16, f ) ) != 0 ||
-        ( ret = mbedtls_mpi_read_file( &P , 16, f ) ) != 0 ||
-        ( ret = mbedtls_mpi_read_file( &Q , 16, f ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_mpi_read_file returned %d\n\n",
-                        ret );
-        fclose( f );
-        goto exit;
-    }
-    fclose( f );
-
-    if( ( ret = mbedtls_rsa_import( &rsa, &N, &P, &Q, &D, &E ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_rsa_import returned %d\n\n",
-                        ret );
-        goto exit;
-    }
-
-    if( ( ret = mbedtls_rsa_complete( &rsa ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_rsa_complete returned %d\n\n",
-                        ret );
-        goto exit;
-    }
-
-    /*
-     * 2b. Get the DHM modulus and generator
-     */
-    mbedtls_printf( "\n  . Reading DH parameters from dh_prime.txt" );
-    fflush( stdout );
-
-    if( ( f = fopen( "dh_prime.txt", "rb" ) ) == NULL )
-    {
-        mbedtls_printf( " failed\n  ! Could not open dh_prime.txt\n" \
-                "  ! Please run dh_genprime first\n\n" );
-        goto exit;
-    }
-
-    if( mbedtls_mpi_read_file( &dhm.P, 16, f ) != 0 ||
-        mbedtls_mpi_read_file( &dhm.G, 16, f ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! Invalid DH parameter file\n\n" );
-        fclose( f );
-        goto exit;
-    }
-
-    fclose( f );
-
-    /*
-     * 3. Wait for a client to connect
-     */
-    mbedtls_printf( "\n  . Waiting for a remote connection" );
-    fflush( stdout );
-
-    if( ( ret = mbedtls_net_bind( &listen_fd, NULL, SERVER_PORT, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_net_bind returned %d\n\n", ret );
-        goto exit;
-    }
-
-    if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
-                                    NULL, 0, NULL ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_net_accept returned %d\n\n", ret );
-        goto exit;
-    }
-
-    /*
-     * 4. Setup the DH parameters (P,G,Ys)
-     */
-    mbedtls_printf( "\n  . Sending the server's DH parameters" );
-    fflush( stdout );
-
-    memset( buf, 0, sizeof( buf ) );
-
-    if( ( ret = mbedtls_dhm_make_params( &dhm, (int) mbedtls_mpi_size( &dhm.P ), buf, &n,
-                                 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_dhm_make_params returned %d\n\n", ret );
-        goto exit;
-    }
-
-    /*
-     * 5. Sign the parameters and send them
-     */
-    if( ( ret = mbedtls_sha1_ret( buf, n, hash ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_sha1_ret returned %d\n\n", ret );
-        goto exit;
-    }
-
-    buf[n    ] = (unsigned char)( rsa.len >> 8 );
-    buf[n + 1] = (unsigned char)( rsa.len      );
-
-    if( ( ret = mbedtls_rsa_pkcs1_sign( &rsa, NULL, NULL, MBEDTLS_RSA_PRIVATE, MBEDTLS_MD_SHA256,
-                                0, hash, buf + n + 2 ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_rsa_pkcs1_sign returned %d\n\n", ret );
-        goto exit;
-    }
-
-    buflen = n + 2 + rsa.len;
-    buf2[0] = (unsigned char)( buflen >> 8 );
-    buf2[1] = (unsigned char)( buflen      );
-
-    if( ( ret = mbedtls_net_send( &client_fd, buf2, 2 ) ) != 2 ||
-        ( ret = mbedtls_net_send( &client_fd, buf, buflen ) ) != (int) buflen )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_net_send returned %d\n\n", ret );
-        goto exit;
-    }
-
-    /*
-     * 6. Get the client's public value: Yc = G ^ Xc mod P
-     */
-    mbedtls_printf( "\n  . Receiving the client's public value" );
-    fflush( stdout );
-
-    memset( buf, 0, sizeof( buf ) );
-
-    n = dhm.len;
-    if( ( ret = mbedtls_net_recv( &client_fd, buf, n ) ) != (int) n )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_net_recv returned %d\n\n", ret );
-        goto exit;
-    }
-
-    if( ( ret = mbedtls_dhm_read_public( &dhm, buf, dhm.len ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_dhm_read_public returned %d\n\n", ret );
-        goto exit;
-    }
-
-    /*
-     * 7. Derive the shared secret: K = Ys ^ Xc mod P
-     */
-    mbedtls_printf( "\n  . Shared secret: " );
-    fflush( stdout );
-
-    if( ( ret = mbedtls_dhm_calc_secret( &dhm, buf, sizeof( buf ), &n,
-                                 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_dhm_calc_secret returned %d\n\n", ret );
-        goto exit;
-    }
-
-    for( n = 0; n < 16; n++ )
-        mbedtls_printf( "%02x", buf[n] );
-
-    /*
-     * 8. Setup the AES-256 encryption key
-     *
-     * This is an overly simplified example; best practice is
-     * to hash the shared secret with a random value to derive
-     * the keying material for the encryption/decryption keys
-     * and MACs.
-     */
-    mbedtls_printf( "...\n  . Encrypting and sending the ciphertext" );
-    fflush( stdout );
-
-    mbedtls_aes_setkey_enc( &aes, buf, 256 );
-    memcpy( buf, PLAINTEXT, 16 );
-    mbedtls_aes_crypt_ecb( &aes, MBEDTLS_AES_ENCRYPT, buf, buf );
-
-    if( ( ret = mbedtls_net_send( &client_fd, buf, 16 ) ) != 16 )
-    {
-        mbedtls_printf( " failed\n  ! mbedtls_net_send returned %d\n\n", ret );
-        goto exit;
-    }
-
-    mbedtls_printf( "\n\n" );
-
-    exit_code = MBEDTLS_EXIT_SUCCESS;
-
-exit:
-
-    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
-    mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E );
-
-    mbedtls_net_free( &client_fd );
-    mbedtls_net_free( &listen_fd );
-
-    mbedtls_aes_free( &aes );
-    mbedtls_rsa_free( &rsa );
-    mbedtls_dhm_free( &dhm );
-    mbedtls_ctr_drbg_free( &ctr_drbg );
-    mbedtls_entropy_free( &entropy );
-
-#if defined(_WIN32)
-    mbedtls_printf( "  + Press Enter to exit this program.\n" );
-    fflush( stdout ); getchar();
-#endif
-
-    return( exit_code );
-}
-#endif /* MBEDTLS_AES_C && MBEDTLS_DHM_C && MBEDTLS_ENTROPY_C &&
-          MBEDTLS_NET_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
-          MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */