diff options
Diffstat (limited to 'lib/mbedtls-2.27.0/programs/pkey/dh_genprime.c')
| -rw-r--r-- | lib/mbedtls-2.27.0/programs/pkey/dh_genprime.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/lib/mbedtls-2.27.0/programs/pkey/dh_genprime.c b/lib/mbedtls-2.27.0/programs/pkey/dh_genprime.c new file mode 100644 index 0000000..a481e32 --- /dev/null +++ b/lib/mbedtls-2.27.0/programs/pkey/dh_genprime.c @@ -0,0 +1,201 @@ +/* + * Diffie-Hellman-Merkle key exchange (prime generation) + * + * 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_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \ + !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_CTR_DRBG_C) || \ + !defined(MBEDTLS_GENPRIME) +int main( void ) +{ + mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or " + "MBEDTLS_FS_IO and/or MBEDTLS_CTR_DRBG_C and/or " + "MBEDTLS_GENPRIME not defined.\n"); + mbedtls_exit( 0 ); +} +#else + +#include "mbedtls/bignum.h" +#include "mbedtls/entropy.h" +#include "mbedtls/ctr_drbg.h" + +#include <stdio.h> +#include <string.h> + +#define USAGE \ + "\n usage: dh_genprime param=<>...\n" \ + "\n acceprable parameters:\n" \ + " bits=%%d default: 2048\n" + +#define DFL_BITS 2048 + +/* + * Note: G = 4 is always a quadratic residue mod P, + * so it is a generator of order Q (with P = 2*Q+1). + */ +#define GENERATOR "4" + + +int main( int argc, char **argv ) +{ + int ret = 1; + int exit_code = MBEDTLS_EXIT_FAILURE; + mbedtls_mpi G, P, Q; + mbedtls_entropy_context entropy; + mbedtls_ctr_drbg_context ctr_drbg; + const char *pers = "dh_genprime"; + FILE *fout; + int nbits = DFL_BITS; + int i; + char *p, *q; + + mbedtls_mpi_init( &G ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q ); + mbedtls_ctr_drbg_init( &ctr_drbg ); + mbedtls_entropy_init( &entropy ); + + if( argc == 0 ) + { + usage: + mbedtls_printf( USAGE ); + goto exit; + } + + for( i = 1; i < argc; i++ ) + { + p = argv[i]; + if( ( q = strchr( p, '=' ) ) == NULL ) + goto usage; + *q++ = '\0'; + + if( strcmp( p, "bits" ) == 0 ) + { + nbits = atoi( q ); + if( nbits < 0 || nbits > MBEDTLS_MPI_MAX_BITS ) + goto usage; + } + else + goto usage; + } + + if( ( ret = mbedtls_mpi_read_string( &G, 10, GENERATOR ) ) != 0 ) + { + mbedtls_printf( " failed\n ! mbedtls_mpi_read_string returned %d\n", ret ); + goto exit; + } + + mbedtls_printf( " ! Generating large primes may take minutes!\n" ); + + mbedtls_printf( "\n . Seeding the random number generator..." ); + fflush( stdout ); + + 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; + } + + mbedtls_printf( " ok\n . Generating the modulus, please wait..." ); + fflush( stdout ); + + /* + * This can take a long time... + */ + if( ( ret = mbedtls_mpi_gen_prime( &P, nbits, 1, + mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 ) + { + mbedtls_printf( " failed\n ! mbedtls_mpi_gen_prime returned %d\n\n", ret ); + goto exit; + } + + mbedtls_printf( " ok\n . Verifying that Q = (P-1)/2 is prime..." ); + fflush( stdout ); + + if( ( ret = mbedtls_mpi_sub_int( &Q, &P, 1 ) ) != 0 ) + { + mbedtls_printf( " failed\n ! mbedtls_mpi_sub_int returned %d\n\n", ret ); + goto exit; + } + + if( ( ret = mbedtls_mpi_div_int( &Q, NULL, &Q, 2 ) ) != 0 ) + { + mbedtls_printf( " failed\n ! mbedtls_mpi_div_int returned %d\n\n", ret ); + goto exit; + } + + if( ( ret = mbedtls_mpi_is_prime_ext( &Q, 50, mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 ) + { + mbedtls_printf( " failed\n ! mbedtls_mpi_is_prime returned %d\n\n", ret ); + goto exit; + } + + mbedtls_printf( " ok\n . Exporting the value in dh_prime.txt..." ); + fflush( stdout ); + + if( ( fout = fopen( "dh_prime.txt", "wb+" ) ) == NULL ) + { + mbedtls_printf( " failed\n ! Could not create dh_prime.txt\n\n" ); + goto exit; + } + + if( ( ret = mbedtls_mpi_write_file( "P = ", &P, 16, fout ) != 0 ) || + ( ret = mbedtls_mpi_write_file( "G = ", &G, 16, fout ) != 0 ) ) + { + mbedtls_printf( " failed\n ! mbedtls_mpi_write_file returned %d\n\n", ret ); + fclose( fout ); + goto exit; + } + + mbedtls_printf( " ok\n\n" ); + fclose( fout ); + + exit_code = MBEDTLS_EXIT_SUCCESS; + +exit: + + mbedtls_mpi_free( &G ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q ); + 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_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_FS_IO && + MBEDTLS_CTR_DRBG_C && MBEDTLS_GENPRIME */ |