244 lines
7.1 KiB
C
Executable file
244 lines
7.1 KiB
C
Executable file
/*
|
|
* Example ECDHE with Curve25519 program
|
|
*
|
|
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
|
|
* SPDX-License-Identifier: GPL-2.0
|
|
*
|
|
* 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.
|
|
*
|
|
* 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_EXIT_SUCCESS EXIT_SUCCESS
|
|
#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
|
|
#endif /* MBEDTLS_PLATFORM_C */
|
|
|
|
#if !defined(MBEDTLS_ECDH_C) || \
|
|
!defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED) || \
|
|
!defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C)
|
|
int main( void )
|
|
{
|
|
mbedtls_printf( "MBEDTLS_ECDH_C and/or "
|
|
"MBEDTLS_ECP_DP_CURVE25519_ENABLED and/or "
|
|
"MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C "
|
|
"not defined\n" );
|
|
return( 0 );
|
|
}
|
|
#else
|
|
|
|
#include "mbedtls/entropy.h"
|
|
#include "mbedtls/ctr_drbg.h"
|
|
#include "mbedtls/ecdh.h"
|
|
|
|
int main( int argc, char *argv[] )
|
|
{
|
|
int ret = 1;
|
|
int exit_code = MBEDTLS_EXIT_FAILURE;
|
|
mbedtls_ecdh_context ctx_cli, ctx_srv;
|
|
mbedtls_entropy_context entropy;
|
|
mbedtls_ctr_drbg_context ctr_drbg;
|
|
unsigned char cli_to_srv[32], srv_to_cli[32];
|
|
const char pers[] = "ecdh";
|
|
((void) argc);
|
|
((void) argv);
|
|
|
|
mbedtls_ecdh_init( &ctx_cli );
|
|
mbedtls_ecdh_init( &ctx_srv );
|
|
mbedtls_ctr_drbg_init( &ctr_drbg );
|
|
|
|
/*
|
|
* Initialize random number generation
|
|
*/
|
|
mbedtls_printf( " . 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,
|
|
sizeof pers ) ) != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
mbedtls_printf( " ok\n" );
|
|
|
|
/*
|
|
* Client: inialize context and generate keypair
|
|
*/
|
|
mbedtls_printf( " . Setting up client context..." );
|
|
fflush( stdout );
|
|
|
|
ret = mbedtls_ecp_group_load( &ctx_cli.grp, MBEDTLS_ECP_DP_CURVE25519 );
|
|
if( ret != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_ecp_group_load returned %d\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
ret = mbedtls_ecdh_gen_public( &ctx_cli.grp, &ctx_cli.d, &ctx_cli.Q,
|
|
mbedtls_ctr_drbg_random, &ctr_drbg );
|
|
if( ret != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_ecdh_gen_public returned %d\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
ret = mbedtls_mpi_write_binary( &ctx_cli.Q.X, cli_to_srv, 32 );
|
|
if( ret != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_mpi_write_binary returned %d\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
mbedtls_printf( " ok\n" );
|
|
|
|
/*
|
|
* Server: initialize context and generate keypair
|
|
*/
|
|
mbedtls_printf( " . Setting up server context..." );
|
|
fflush( stdout );
|
|
|
|
ret = mbedtls_ecp_group_load( &ctx_srv.grp, MBEDTLS_ECP_DP_CURVE25519 );
|
|
if( ret != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_ecp_group_load returned %d\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
ret = mbedtls_ecdh_gen_public( &ctx_srv.grp, &ctx_srv.d, &ctx_srv.Q,
|
|
mbedtls_ctr_drbg_random, &ctr_drbg );
|
|
if( ret != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_ecdh_gen_public returned %d\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
ret = mbedtls_mpi_write_binary( &ctx_srv.Q.X, srv_to_cli, 32 );
|
|
if( ret != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_mpi_write_binary returned %d\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
mbedtls_printf( " ok\n" );
|
|
|
|
/*
|
|
* Server: read peer's key and generate shared secret
|
|
*/
|
|
mbedtls_printf( " . Server reading client key and computing secret..." );
|
|
fflush( stdout );
|
|
|
|
ret = mbedtls_mpi_lset( &ctx_srv.Qp.Z, 1 );
|
|
if( ret != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_mpi_lset returned %d\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
ret = mbedtls_mpi_read_binary( &ctx_srv.Qp.X, cli_to_srv, 32 );
|
|
if( ret != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_mpi_read_binary returned %d\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
ret = mbedtls_ecdh_compute_shared( &ctx_srv.grp, &ctx_srv.z,
|
|
&ctx_srv.Qp, &ctx_srv.d,
|
|
mbedtls_ctr_drbg_random, &ctr_drbg );
|
|
if( ret != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_ecdh_compute_shared returned %d\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
mbedtls_printf( " ok\n" );
|
|
|
|
/*
|
|
* Client: read peer's key and generate shared secret
|
|
*/
|
|
mbedtls_printf( " . Client reading server key and computing secret..." );
|
|
fflush( stdout );
|
|
|
|
ret = mbedtls_mpi_lset( &ctx_cli.Qp.Z, 1 );
|
|
if( ret != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_mpi_lset returned %d\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
ret = mbedtls_mpi_read_binary( &ctx_cli.Qp.X, srv_to_cli, 32 );
|
|
if( ret != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_mpi_read_binary returned %d\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
ret = mbedtls_ecdh_compute_shared( &ctx_cli.grp, &ctx_cli.z,
|
|
&ctx_cli.Qp, &ctx_cli.d,
|
|
mbedtls_ctr_drbg_random, &ctr_drbg );
|
|
if( ret != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_ecdh_compute_shared returned %d\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
mbedtls_printf( " ok\n" );
|
|
|
|
/*
|
|
* Verification: are the computed secrets equal?
|
|
*/
|
|
mbedtls_printf( " . Checking if both computed secrets are equal..." );
|
|
fflush( stdout );
|
|
|
|
ret = mbedtls_mpi_cmp_mpi( &ctx_cli.z, &ctx_srv.z );
|
|
if( ret != 0 )
|
|
{
|
|
mbedtls_printf( " failed\n ! mbedtls_ecdh_compute_shared returned %d\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
mbedtls_printf( " ok\n" );
|
|
|
|
exit_code = MBEDTLS_EXIT_SUCCESS;
|
|
|
|
exit:
|
|
|
|
#if defined(_WIN32)
|
|
mbedtls_printf( " + Press Enter to exit this program.\n" );
|
|
fflush( stdout ); getchar();
|
|
#endif
|
|
|
|
mbedtls_ecdh_free( &ctx_srv );
|
|
mbedtls_ecdh_free( &ctx_cli );
|
|
mbedtls_ctr_drbg_free( &ctr_drbg );
|
|
mbedtls_entropy_free( &entropy );
|
|
|
|
return( exit_code );
|
|
}
|
|
#endif /* MBEDTLS_ECDH_C && MBEDTLS_ECP_DP_CURVE25519_ENABLED &&
|
|
MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */
|