programs/pkey/dh_server.c - security/mbedtls - Rivoreo Source Code Repositories

 /*
  *  Diffie-Hellman-Merkle key exchange (server side)
  *
  *  Copyright (C) 2006-2011, ARM Limited, All Rights Reserved
  *
  *  This file is part of mbed TLS (https://polarssl.org)
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License along
  *  with this program; if not, write to the Free Software Foundation, Inc.,
  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */

 #if !defined(POLARSSL_CONFIG_FILE)
 #include "polarssl/config.h"
 #else
 #include POLARSSL_CONFIG_FILE
 #endif

 #if defined(POLARSSL_PLATFORM_C)
 #include "polarssl/platform.h"
 #else
 #include <stdio.h>
 #define polarssl_printf     printf
 #endif

 #if defined(POLARSSL_AES_C) && defined(POLARSSL_DHM_C) && \
     defined(POLARSSL_ENTROPY_C) && defined(POLARSSL_NET_C) && \
     defined(POLARSSL_RSA_C) && defined(POLARSSL_SHA256_C) && \
     defined(POLARSSL_FS_IO) && defined(POLARSSL_CTR_DRBG_C)
 #include "polarssl/net.h"
 #include "polarssl/aes.h"
 #include "polarssl/dhm.h"
 #include "polarssl/rsa.h"
 #include "polarssl/sha1.h"
 #include "polarssl/entropy.h"
 #include "polarssl/ctr_drbg.h"

 #include <stdio.h>
 #include <string.h>
 #endif

 #define SERVER_PORT 11999
 #define PLAINTEXT "==Hello there!=="

 #if !defined(POLARSSL_AES_C) || !defined(POLARSSL_DHM_C) ||     \
     !defined(POLARSSL_ENTROPY_C) || !defined(POLARSSL_NET_C) ||  \
     !defined(POLARSSL_RSA_C) || !defined(POLARSSL_SHA256_C) ||    \
     !defined(POLARSSL_FS_IO) || !defined(POLARSSL_CTR_DRBG_C)
 int main( void )
 {
     polarssl_printf("POLARSSL_AES_C and/or POLARSSL_DHM_C and/or POLARSSL_ENTROPY_C "
            "and/or POLARSSL_NET_C and/or POLARSSL_RSA_C and/or "
            "POLARSSL_SHA256_C and/or POLARSSL_FS_IO and/or "
            "POLARSSL_CTR_DBRG_C not defined.\n");
     return( 0 );
 }
 #else
 int main( void )
 {
     FILE *f;

     int ret;
     size_t n, buflen;
     int listen_fd = -1;
     int client_fd = -1;

     unsigned char buf[2048];
     unsigned char hash[20];
     unsigned char buf2[2];
     const char *pers = "dh_server";

     entropy_context entropy;
     ctr_drbg_context ctr_drbg;
     rsa_context rsa;
     dhm_context dhm;
     aes_context aes;

     memset( &rsa, 0, sizeof( rsa ) );
     dhm_init( &dhm );
     aes_init( &aes );

     /*
      * 1. Setup the RNG
      */
     polarssl_printf( "\n  . Seeding the random number generator" );
     fflush( stdout );

     entropy_init( &entropy );
     if( ( ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy,
                                (const unsigned char *) pers,
                                strlen( pers ) ) ) != 0 )
     {
         polarssl_printf( " failed\n  ! ctr_drbg_init returned %d\n", ret );
         goto exit;
     }

     /*
      * 2a. Read the server's private RSA key
      */
     polarssl_printf( "\n  . Reading private key from rsa_priv.txt" );
     fflush( stdout );

     if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
     {
         ret = 1;
         polarssl_printf( " failed\n  ! Could not open rsa_priv.txt\n" \
                 "  ! Please run rsa_genkey first\n\n" );
         goto exit;
     }

     rsa_init( &rsa, RSA_PKCS_V15, 0 );

     if( ( ret = mpi_read_file( &rsa.N , 16, f ) ) != 0 ||
         ( ret = mpi_read_file( &rsa.E , 16, f ) ) != 0 ||
         ( ret = mpi_read_file( &rsa.D , 16, f ) ) != 0 ||
         ( ret = mpi_read_file( &rsa.P , 16, f ) ) != 0 ||
         ( ret = mpi_read_file( &rsa.Q , 16, f ) ) != 0 ||
         ( ret = mpi_read_file( &rsa.DP, 16, f ) ) != 0 ||
         ( ret = mpi_read_file( &rsa.DQ, 16, f ) ) != 0 ||
         ( ret = mpi_read_file( &rsa.QP, 16, f ) ) != 0 )
     {
         polarssl_printf( " failed\n  ! mpi_read_file returned %d\n\n", ret );
         goto exit;
     }

     rsa.len = ( mpi_msb( &rsa.N ) + 7 ) >> 3;

     fclose( f );

     /*
      * 2b. Get the DHM modulus and generator
      */
     polarssl_printf( "\n  . Reading DH parameters from dh_prime.txt" );
     fflush( stdout );

     if( ( f = fopen( "dh_prime.txt", "rb" ) ) == NULL )
     {
         ret = 1;
         polarssl_printf( " failed\n  ! Could not open dh_prime.txt\n" \
                 "  ! Please run dh_genprime first\n\n" );
         goto exit;
     }

     if( mpi_read_file( &dhm.P, 16, f ) != 0 ||
         mpi_read_file( &dhm.G, 16, f ) != 0 )
     {
         polarssl_printf( " failed\n  ! Invalid DH parameter file\n\n" );
         goto exit;
     }

     fclose( f );

     /*
      * 3. Wait for a client to connect
      */
     polarssl_printf( "\n  . Waiting for a remote connection" );
     fflush( stdout );

     if( ( ret = net_bind( &listen_fd, NULL, SERVER_PORT ) ) != 0 )
     {
         polarssl_printf( " failed\n  ! net_bind returned %d\n\n", ret );
         goto exit;
     }

     if( ( ret = net_accept( listen_fd, &client_fd, NULL ) ) != 0 )
     {
         polarssl_printf( " failed\n  ! net_accept returned %d\n\n", ret );
         goto exit;
     }

     /*
      * 4. Setup the DH parameters (P,G,Ys)
      */
     polarssl_printf( "\n  . Sending the server's DH parameters" );
     fflush( stdout );

     memset( buf, 0, sizeof( buf ) );

     if( ( ret = dhm_make_params( &dhm, (int) mpi_size( &dhm.P ), buf, &n,
                                  ctr_drbg_random, &ctr_drbg ) ) != 0 )
     {
         polarssl_printf( " failed\n  ! dhm_make_params returned %d\n\n", ret );
         goto exit;
     }

     /*
      * 5. Sign the parameters and send them
      */
     sha1( buf, n, hash );

     buf[n    ] = (unsigned char)( rsa.len >> 8 );
     buf[n + 1] = (unsigned char)( rsa.len      );

     if( ( ret = rsa_pkcs1_sign( &rsa, NULL, NULL, RSA_PRIVATE, POLARSSL_MD_SHA256,
                                 0, hash, buf + n + 2 ) ) != 0 )
     {
         polarssl_printf( " failed\n  ! 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 = net_send( &client_fd, buf2, 2 ) ) != 2 ||
         ( ret = net_send( &client_fd, buf, buflen ) ) != (int) buflen )
     {
         polarssl_printf( " failed\n  ! net_send returned %d\n\n", ret );
         goto exit;
     }

     /*
      * 6. Get the client's public value: Yc = G ^ Xc mod P
      */
     polarssl_printf( "\n  . Receiving the client's public value" );
     fflush( stdout );

     memset( buf, 0, sizeof( buf ) );
     n = dhm.len;

     if( ( ret = net_recv( &client_fd, buf, n ) ) != (int) n )
     {
         polarssl_printf( " failed\n  ! net_recv returned %d\n\n", ret );
         goto exit;
     }

     if( ( ret = dhm_read_public( &dhm, buf, dhm.len ) ) != 0 )
     {
         polarssl_printf( " failed\n  ! dhm_read_public returned %d\n\n", ret );
         goto exit;
     }

     /*
      * 7. Derive the shared secret: K = Ys ^ Xc mod P
      */
     polarssl_printf( "\n  . Shared secret: " );
     fflush( stdout );

     if( ( ret = dhm_calc_secret( &dhm, buf, &n,
                                  ctr_drbg_random, &ctr_drbg ) ) != 0 )
     {
         polarssl_printf( " failed\n  ! dhm_calc_secret returned %d\n\n", ret );
         goto exit;
     }

     for( n = 0; n < 16; n++ )
         polarssl_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.
      */
     polarssl_printf( "...\n  . Encrypting and sending the ciphertext" );
     fflush( stdout );

     aes_setkey_enc( &aes, buf, 256 );
     memcpy( buf, PLAINTEXT, 16 );
     aes_crypt_ecb( &aes, AES_ENCRYPT, buf, buf );

     if( ( ret = net_send( &client_fd, buf, 16 ) ) != 16 )
     {
         polarssl_printf( " failed\n  ! net_send returned %d\n\n", ret );
         goto exit;
     }

     polarssl_printf( "\n\n" );

 exit:

     if( client_fd != -1 )
         net_close( client_fd );

     aes_free( &aes );
     rsa_free( &rsa );
     dhm_free( &dhm );
     ctr_drbg_free( &ctr_drbg );
     entropy_free( &entropy );

 #if defined(_WIN32)
     polarssl_printf( "  + Press Enter to exit this program.\n" );
     fflush( stdout ); getchar();
 #endif

     return( ret );
 }
 #endif /* POLARSSL_AES_C && POLARSSL_DHM_C && POLARSSL_ENTROPY_C &&
           POLARSSL_NET_C && POLARSSL_RSA_C && POLARSSL_SHA256_C &&
           POLARSSL_FS_IO && POLARSSL_CTR_DRBG_C */
	/*
	* Diffie-Hellman-Merkle key exchange (server side)
	*
	* Copyright (C) 2006-2011, ARM Limited, All Rights Reserved
	*
	* This file is part of mbed TLS (https://polarssl.org)
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write to the Free Software Foundation, Inc.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	*/

	#if !defined(POLARSSL_CONFIG_FILE)
	#include "polarssl/config.h"
	#else
	#include POLARSSL_CONFIG_FILE
	#endif

	#if defined(POLARSSL_PLATFORM_C)
	#include "polarssl/platform.h"
	#else
	#include <stdio.h>
	#define polarssl_printf printf
	#endif

	#if defined(POLARSSL_AES_C) && defined(POLARSSL_DHM_C) && \
	defined(POLARSSL_ENTROPY_C) && defined(POLARSSL_NET_C) && \
	defined(POLARSSL_RSA_C) && defined(POLARSSL_SHA256_C) && \
	defined(POLARSSL_FS_IO) && defined(POLARSSL_CTR_DRBG_C)
	#include "polarssl/net.h"
	#include "polarssl/aes.h"
	#include "polarssl/dhm.h"
	#include "polarssl/rsa.h"
	#include "polarssl/sha1.h"
	#include "polarssl/entropy.h"
	#include "polarssl/ctr_drbg.h"

	#include <stdio.h>
	#include <string.h>
	#endif

	#define SERVER_PORT 11999
	#define PLAINTEXT "==Hello there!=="

	#if !defined(POLARSSL_AES_C) \|\| !defined(POLARSSL_DHM_C) \|\| \
	!defined(POLARSSL_ENTROPY_C) \|\| !defined(POLARSSL_NET_C) \|\| \
	!defined(POLARSSL_RSA_C) \|\| !defined(POLARSSL_SHA256_C) \|\| \
	!defined(POLARSSL_FS_IO) \|\| !defined(POLARSSL_CTR_DRBG_C)
	int main( void )
	{
	polarssl_printf("POLARSSL_AES_C and/or POLARSSL_DHM_C and/or POLARSSL_ENTROPY_C "
	"and/or POLARSSL_NET_C and/or POLARSSL_RSA_C and/or "
	"POLARSSL_SHA256_C and/or POLARSSL_FS_IO and/or "
	"POLARSSL_CTR_DBRG_C not defined.\n");
	return( 0 );
	}
	#else
	int main( void )
	{
	FILE *f;

	int ret;
	size_t n, buflen;
	int listen_fd = -1;
	int client_fd = -1;

	unsigned char buf[2048];
	unsigned char hash[20];
	unsigned char buf2[2];
	const char *pers = "dh_server";

	entropy_context entropy;
	ctr_drbg_context ctr_drbg;
	rsa_context rsa;
	dhm_context dhm;
	aes_context aes;

	memset( &rsa, 0, sizeof( rsa ) );
	dhm_init( &dhm );
	aes_init( &aes );

	/*
	* 1. Setup the RNG
	*/
	polarssl_printf( "\n . Seeding the random number generator" );
	fflush( stdout );

	entropy_init( &entropy );
	if( ( ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy,
	(const unsigned char *) pers,
	strlen( pers ) ) ) != 0 )
	{
	polarssl_printf( " failed\n ! ctr_drbg_init returned %d\n", ret );
	goto exit;
	}

	/*
	* 2a. Read the server's private RSA key
	*/
	polarssl_printf( "\n . Reading private key from rsa_priv.txt" );
	fflush( stdout );

	if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
	{
	ret = 1;
	polarssl_printf( " failed\n ! Could not open rsa_priv.txt\n" \
	" ! Please run rsa_genkey first\n\n" );
	goto exit;
	}

	rsa_init( &rsa, RSA_PKCS_V15, 0 );

	if( ( ret = mpi_read_file( &rsa.N , 16, f ) ) != 0 \|\|
	( ret = mpi_read_file( &rsa.E , 16, f ) ) != 0 \|\|
	( ret = mpi_read_file( &rsa.D , 16, f ) ) != 0 \|\|
	( ret = mpi_read_file( &rsa.P , 16, f ) ) != 0 \|\|
	( ret = mpi_read_file( &rsa.Q , 16, f ) ) != 0 \|\|
	( ret = mpi_read_file( &rsa.DP, 16, f ) ) != 0 \|\|
	( ret = mpi_read_file( &rsa.DQ, 16, f ) ) != 0 \|\|
	( ret = mpi_read_file( &rsa.QP, 16, f ) ) != 0 )
	{
	polarssl_printf( " failed\n ! mpi_read_file returned %d\n\n", ret );
	goto exit;
	}

	rsa.len = ( mpi_msb( &rsa.N ) + 7 ) >> 3;

	fclose( f );

	/*
	* 2b. Get the DHM modulus and generator
	*/
	polarssl_printf( "\n . Reading DH parameters from dh_prime.txt" );
	fflush( stdout );

	if( ( f = fopen( "dh_prime.txt", "rb" ) ) == NULL )
	{
	ret = 1;
	polarssl_printf( " failed\n ! Could not open dh_prime.txt\n" \
	" ! Please run dh_genprime first\n\n" );
	goto exit;
	}

	if( mpi_read_file( &dhm.P, 16, f ) != 0 \|\|
	mpi_read_file( &dhm.G, 16, f ) != 0 )
	{
	polarssl_printf( " failed\n ! Invalid DH parameter file\n\n" );
	goto exit;
	}

	fclose( f );

	/*
	* 3. Wait for a client to connect
	*/
	polarssl_printf( "\n . Waiting for a remote connection" );
	fflush( stdout );

	if( ( ret = net_bind( &listen_fd, NULL, SERVER_PORT ) ) != 0 )
	{
	polarssl_printf( " failed\n ! net_bind returned %d\n\n", ret );
	goto exit;
	}

	if( ( ret = net_accept( listen_fd, &client_fd, NULL ) ) != 0 )
	{
	polarssl_printf( " failed\n ! net_accept returned %d\n\n", ret );
	goto exit;
	}

	/*
	* 4. Setup the DH parameters (P,G,Ys)
	*/
	polarssl_printf( "\n . Sending the server's DH parameters" );
	fflush( stdout );

	memset( buf, 0, sizeof( buf ) );

	if( ( ret = dhm_make_params( &dhm, (int) mpi_size( &dhm.P ), buf, &n,
	ctr_drbg_random, &ctr_drbg ) ) != 0 )
	{
	polarssl_printf( " failed\n ! dhm_make_params returned %d\n\n", ret );
	goto exit;
	}

	/*
	* 5. Sign the parameters and send them
	*/
	sha1( buf, n, hash );

	buf[n ] = (unsigned char)( rsa.len >> 8 );
	buf[n + 1] = (unsigned char)( rsa.len );

	if( ( ret = rsa_pkcs1_sign( &rsa, NULL, NULL, RSA_PRIVATE, POLARSSL_MD_SHA256,
	0, hash, buf + n + 2 ) ) != 0 )
	{
	polarssl_printf( " failed\n ! 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 = net_send( &client_fd, buf2, 2 ) ) != 2 \|\|
	( ret = net_send( &client_fd, buf, buflen ) ) != (int) buflen )
	{
	polarssl_printf( " failed\n ! net_send returned %d\n\n", ret );
	goto exit;
	}

	/*
	* 6. Get the client's public value: Yc = G ^ Xc mod P
	*/
	polarssl_printf( "\n . Receiving the client's public value" );
	fflush( stdout );

	memset( buf, 0, sizeof( buf ) );
	n = dhm.len;

	if( ( ret = net_recv( &client_fd, buf, n ) ) != (int) n )
	{
	polarssl_printf( " failed\n ! net_recv returned %d\n\n", ret );
	goto exit;
	}

	if( ( ret = dhm_read_public( &dhm, buf, dhm.len ) ) != 0 )
	{
	polarssl_printf( " failed\n ! dhm_read_public returned %d\n\n", ret );
	goto exit;
	}

	/*
	* 7. Derive the shared secret: K = Ys ^ Xc mod P
	*/
	polarssl_printf( "\n . Shared secret: " );
	fflush( stdout );

	if( ( ret = dhm_calc_secret( &dhm, buf, &n,
	ctr_drbg_random, &ctr_drbg ) ) != 0 )
	{
	polarssl_printf( " failed\n ! dhm_calc_secret returned %d\n\n", ret );
	goto exit;
	}

	for( n = 0; n < 16; n++ )
	polarssl_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.
	*/
	polarssl_printf( "...\n . Encrypting and sending the ciphertext" );
	fflush( stdout );

	aes_setkey_enc( &aes, buf, 256 );
	memcpy( buf, PLAINTEXT, 16 );
	aes_crypt_ecb( &aes, AES_ENCRYPT, buf, buf );

	if( ( ret = net_send( &client_fd, buf, 16 ) ) != 16 )
	{
	polarssl_printf( " failed\n ! net_send returned %d\n\n", ret );
	goto exit;
	}

	polarssl_printf( "\n\n" );

	exit:

	if( client_fd != -1 )
	net_close( client_fd );

	aes_free( &aes );
	rsa_free( &rsa );
	dhm_free( &dhm );
	ctr_drbg_free( &ctr_drbg );
	entropy_free( &entropy );

	#if defined(_WIN32)
	polarssl_printf( " + Press Enter to exit this program.\n" );
	fflush( stdout ); getchar();
	#endif

	return( ret );
	}
	#endif /* POLARSSL_AES_C && POLARSSL_DHM_C && POLARSSL_ENTROPY_C &&
	POLARSSL_NET_C && POLARSSL_RSA_C && POLARSSL_SHA256_C &&
	POLARSSL_FS_IO && POLARSSL_CTR_DRBG_C */