programs/pkey/dh_client.c - mirror/mbed-tls - TrustedFirmware Git Browser

 /*
  *  Diffie-Hellman-Merkle key exchange (client side)
  *
  *  Copyright The Mbed TLS Contributors
  *  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.
  */

 #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");
     mbedtls_exit( 0 );
 }
 #else


 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

     mbedtls_exit( 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 */
	/*
	* Diffie-Hellman-Merkle key exchange (client side)
	*
	* Copyright The Mbed TLS Contributors
	* 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.
	*/

	#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");
	mbedtls_exit( 0 );
	}
	#else


	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

	mbedtls_exit( 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 */