228 lines
6.7 KiB
C
Executable file
228 lines
6.7 KiB
C
Executable file
/*
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* Diffie-Hellman-Merkle key exchange (prime generation)
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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*
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* This file is provided under the Apache License 2.0, or the
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* GNU General Public License v2.0 or later.
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*
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* **********
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* Apache License 2.0:
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* **********
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*
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* **********
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* GNU General Public License v2.0 or later:
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* **********
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdio.h>
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#include <stdlib.h>
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#define mbedtls_printf printf
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#define mbedtls_time_t time_t
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#define mbedtls_exit exit
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#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
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#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
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#endif /* MBEDTLS_PLATFORM_C */
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#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
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!defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_CTR_DRBG_C) || \
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!defined(MBEDTLS_GENPRIME)
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int main( void )
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{
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mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
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"MBEDTLS_FS_IO and/or MBEDTLS_CTR_DRBG_C and/or "
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"MBEDTLS_GENPRIME not defined.\n");
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mbedtls_exit( 0 );
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}
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#else
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#include "mbedtls/bignum.h"
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include <stdio.h>
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#include <string.h>
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#define USAGE \
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"\n usage: dh_genprime param=<>...\n" \
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"\n acceprable parameters:\n" \
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" bits=%%d default: 2048\n"
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#define DFL_BITS 2048
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/*
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* Note: G = 4 is always a quadratic residue mod P,
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* so it is a generator of order Q (with P = 2*Q+1).
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*/
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#define GENERATOR "4"
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int main( int argc, char **argv )
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{
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int ret = 1;
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int exit_code = MBEDTLS_EXIT_FAILURE;
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mbedtls_mpi G, P, Q;
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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const char *pers = "dh_genprime";
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FILE *fout;
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int nbits = DFL_BITS;
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int i;
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char *p, *q;
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mbedtls_mpi_init( &G ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
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mbedtls_ctr_drbg_init( &ctr_drbg );
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mbedtls_entropy_init( &entropy );
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if( argc == 0 )
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{
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usage:
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mbedtls_printf( USAGE );
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goto exit;
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}
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for( i = 1; i < argc; i++ )
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{
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p = argv[i];
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if( ( q = strchr( p, '=' ) ) == NULL )
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goto usage;
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*q++ = '\0';
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if( strcmp( p, "bits" ) == 0 )
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{
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nbits = atoi( q );
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if( nbits < 0 || nbits > MBEDTLS_MPI_MAX_BITS )
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goto usage;
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}
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else
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goto usage;
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}
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if( ( ret = mbedtls_mpi_read_string( &G, 10, GENERATOR ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_mpi_read_string returned %d\n", ret );
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goto exit;
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}
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mbedtls_printf( " ! Generating large primes may take minutes!\n" );
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mbedtls_printf( "\n . Seeding the random number generator..." );
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fflush( stdout );
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if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
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(const unsigned char *) pers,
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strlen( pers ) ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
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goto exit;
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}
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mbedtls_printf( " ok\n . Generating the modulus, please wait..." );
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fflush( stdout );
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/*
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* This can take a long time...
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*/
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if( ( ret = mbedtls_mpi_gen_prime( &P, nbits, 1,
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mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_mpi_gen_prime returned %d\n\n", ret );
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goto exit;
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}
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mbedtls_printf( " ok\n . Verifying that Q = (P-1)/2 is prime..." );
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fflush( stdout );
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if( ( ret = mbedtls_mpi_sub_int( &Q, &P, 1 ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_mpi_sub_int returned %d\n\n", ret );
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goto exit;
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}
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if( ( ret = mbedtls_mpi_div_int( &Q, NULL, &Q, 2 ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_mpi_div_int returned %d\n\n", ret );
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goto exit;
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}
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if( ( ret = mbedtls_mpi_is_prime_ext( &Q, 50, mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_mpi_is_prime returned %d\n\n", ret );
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goto exit;
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}
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mbedtls_printf( " ok\n . Exporting the value in dh_prime.txt..." );
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fflush( stdout );
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if( ( fout = fopen( "dh_prime.txt", "wb+" ) ) == NULL )
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{
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mbedtls_printf( " failed\n ! Could not create dh_prime.txt\n\n" );
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goto exit;
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}
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if( ( ret = mbedtls_mpi_write_file( "P = ", &P, 16, fout ) != 0 ) ||
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( ret = mbedtls_mpi_write_file( "G = ", &G, 16, fout ) != 0 ) )
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{
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mbedtls_printf( " failed\n ! mbedtls_mpi_write_file returned %d\n\n", ret );
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fclose( fout );
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goto exit;
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}
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mbedtls_printf( " ok\n\n" );
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fclose( fout );
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exit_code = MBEDTLS_EXIT_SUCCESS;
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exit:
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mbedtls_mpi_free( &G ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
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mbedtls_ctr_drbg_free( &ctr_drbg );
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mbedtls_entropy_free( &entropy );
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#if defined(_WIN32)
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mbedtls_printf( " Press Enter to exit this program.\n" );
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fflush( stdout ); getchar();
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#endif
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mbedtls_exit( exit_code );
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}
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#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_FS_IO &&
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MBEDTLS_CTR_DRBG_C && MBEDTLS_GENPRIME */
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