/* * Copyright (C) 2000,2001 Nikos Mavroyanopoulos * * This file is part of GNUTLS. * * GNUTLS 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. * * GNUTLS 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA */ #include #include #include #include static uint8 DH_G_1024[] = { 0x02 }; static uint8 DH_G_4096[] = { 0x05 }; static uint8 DH_G_2048[] = { 0x05 }; static uint8 DH_G_3072[] = { 0x0D }; static uint8 diffie_hellman_group1_prime[] = { 0x00, 0x04, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2, 0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1, 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6, 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD, 0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D, 0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45, 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9, 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED, 0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11, 0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE6, 0x53, 0x81, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; /* prime - 4096 bits */ static uint8 diffie_hellman_prime_4096[] = { 0x00, 0x98, 0xb7, 0x3d, 0x66, 0xf1, 0x18, 0x61, 0xa9, 0x36, 0xd9, 0xf1, 0xbf, 0x65, 0xbb, 0x7c, 0x06, 0x10, 0x15, 0xe5, 0x24, 0x47, 0xb5, 0x45, 0x7e, 0xbb, 0xdf, 0x59, 0xf4, 0xf2, 0x59, 0x7d, 0xea, 0xe0, 0x0f, 0x06, 0x42, 0xd8, 0xb1, 0x9b, 0x62, 0xf9, 0x81, 0x05, 0xd7, 0xd5, 0x74, 0x7c, 0x39, 0x3b, 0x6d, 0x57, 0xb7, 0xe9, 0x51, 0x0d, 0xb6, 0xe5, 0x03, 0xf7, 0xf3, 0xac, 0x1b, 0x66, 0x96, 0xb3, 0xf8, 0xa1, 0xe1, 0xc7, 0x9c, 0xc7, 0x52, 0x19, 0x2a, 0x90, 0xe6, 0x1d, 0xba, 0xf5, 0x15, 0xcb, 0x8b, 0x52, 0x88, 0xcd, 0xf5, 0x50, 0x33, 0x04, 0xb8, 0x2f, 0x2c, 0x01, 0x57, 0x82, 0x7c, 0x8a, 0xf0, 0xa3, 0x73, 0x7e, 0x0c, 0x2d, 0x69, 0xd4, 0x17, 0xf6, 0xd0, 0x6a, 0x32, 0x95, 0x6a, 0x69, 0x40, 0xb0, 0x55, 0x4f, 0xf0, 0x1d, 0xae, 0x3d, 0x5f, 0x01, 0x92, 0x14, 0x3a, 0x73, 0x69, 0x5a, 0x8e, 0xea, 0x22, 0x52, 0x44, 0xc2, 0xb8, 0x66, 0x1e, 0x26, 0x1a, 0x5d, 0x8f, 0x46, 0x6b, 0x8d, 0x3c, 0x71, 0xcf, 0x1d, 0x72, 0x8d, 0x2f, 0x03, 0x54, 0xdb, 0xe9, 0x82, 0x60, 0xe5, 0xf6, 0x40, 0x4b, 0x6b, 0xae, 0x0a, 0xb2, 0x30, 0xba, 0x1c, 0x45, 0x7e, 0x3f, 0xfd, 0xf7, 0xdc, 0xa6, 0xbb, 0x98, 0xc4, 0xca, 0xfc, 0x66, 0xf3, 0x48, 0x47, 0xbf, 0xdb, 0xd7, 0xdc, 0xff, 0x1d, 0xeb, 0xa0, 0x4e, 0xb6, 0xff, 0x75, 0xdc, 0x0c, 0x1d, 0x93, 0x9e, 0xd5, 0xb3, 0x68, 0xe7, 0x07, 0x29, 0x91, 0xf1, 0xae, 0xfc, 0x7e, 0x3a, 0xea, 0xec, 0x40, 0xfc, 0x70, 0x7f, 0xf3, 0x36, 0x81, 0xec, 0x97, 0xa7, 0x0d, 0x71, 0x2c, 0x5c, 0x4f, 0xd9, 0x00, 0xcf, 0x62, 0x56, 0xfb, 0x09, 0x2d, 0x1b, 0x04, 0x3c, 0x00, 0xc8, 0x17, 0xd7, 0x7d, 0x16, 0x20, 0x1e, 0x62, 0x9b, 0xf4, 0x4f, 0xee, 0xa4, 0xbf, 0x0b, 0xde, 0x51, 0x7c, 0x01, 0x76, 0x79, 0x73, 0x7d, 0x7b, 0xec, 0xee, 0x14, 0xec, 0x83, 0xc3, 0xb4, 0x42, 0x66, 0x19, 0x52, 0x19, 0x04, 0x02, 0x71, 0x61, 0x5c, 0x78, 0xee, 0x5f, 0x58, 0x1e, 0x5b, 0x2d, 0xf3, 0x0c, 0x6e, 0x00, 0x0f, 0xd8, 0xf0, 0x86, 0xa1, 0x11, 0xfd, 0x04, 0x07, 0xa6, 0xf7, 0x31, 0xb9, 0xf6, 0x76, 0xfc, 0xea, 0xf0, 0x16, 0x98, 0x37, 0x48, 0x1b, 0x0c, 0x32, 0x3f, 0x7e, 0xfa, 0x02, 0x04, 0x2a, 0x48, 0x70, 0xb4, 0xe3, 0xe0, 0xc1, 0x7f, 0x65, 0x70, 0xd0, 0x71, 0x74, 0x86, 0xb7, 0x5d, 0xd4, 0x84, 0xd5, 0x9d, 0x77, 0xf6, 0x72, 0x82, 0x4b, 0x98, 0x8b, 0x49, 0x3a, 0x0b, 0x1e, 0x94, 0x42, 0xf7, 0x0b, 0x3f, 0xec, 0xc2, 0x2b, 0x7f, 0x55, 0xe2, 0x94, 0x48, 0xac, 0x04, 0xb9, 0xb2, 0xb6, 0xca, 0xb4, 0x09, 0xe3, 0xba, 0x6a, 0x55, 0x28, 0xf7, 0x8a, 0x73, 0x4d, 0x21, 0xe1, 0xf4, 0xcd, 0x22, 0x15, 0x9c, 0xe6, 0xcc, 0x1d, 0x9f, 0x81, 0x88, 0x4c, 0x5a, 0x17, 0x9f, 0xe5, 0x8c, 0x85, 0xf1, 0xa3, 0xcf, 0x6c, 0xa1, 0xbf, 0x5e, 0x02, 0x61, 0xa8, 0x67, 0x6f, 0xb8, 0x20, 0x1a, 0x4e, 0xf2, 0x05, 0xd7, 0xb4, 0x4b, 0x3e, 0xca, 0x87, 0x49, 0x10, 0x16, 0xcc, 0xc9, 0xe0, 0x1c, 0xc1, 0x83, 0xc7, 0xa0, 0x54, 0x3d, 0x36, 0x17, 0x84, 0xc3, 0x84, 0x2e, 0x5a, 0xe0, 0x75, 0x45, 0x01, 0xe6, 0xf0, 0x3d, 0xf9, 0x33, 0x0a, 0xd9, 0x1e, 0x66, 0x99, 0xb4, 0x21, 0xed, 0x6e, 0xda, 0x6f, 0x37, 0x33, 0xdd, 0x8f, 0x25, 0x35, 0x5e, 0x6c, 0x1e, 0x33, 0xc2, 0x41, 0x3f, 0x58, 0x40, 0xbb, 0xe7, 0x2b, 0x54, 0xdb, 0xd8, 0xcf, 0x3a, 0xba, 0x0c, 0xf1, 0x19, 0xec, 0x9d, 0x50, 0xf6, 0x63, 0x22, 0x55, 0x5e, 0x79, 0xd1, 0x3f, 0x46, 0x0f, 0xf3, 0x7f }; /* prime - 3072 bits */ static uint8 diffie_hellman_prime_3072[] = { 0x00, 0xd5, 0x6e, 0xc8, 0x1f, 0xe9, 0x80, 0x9e, 0x56, 0x35, 0x6d, 0x6d, 0xdb, 0xfa, 0x47, 0x75, 0xcd, 0xfa, 0x32, 0x52, 0x1a, 0xc8, 0xad, 0xee, 0xb0, 0xdb, 0xb7, 0x07, 0x58, 0xa6, 0x42, 0xfe, 0x59, 0xfb, 0xce, 0xe8, 0x12, 0x63, 0x09, 0x9f, 0x5d, 0x15, 0x25, 0x49, 0xf2, 0x61, 0x83, 0xd8, 0x5c, 0x81, 0xdd, 0x4c, 0x26, 0xe6, 0x24, 0xce, 0x6a, 0xa5, 0x07, 0x80, 0x1c, 0x3d, 0x94, 0xd1, 0x5d, 0x73, 0xbd, 0x26, 0x48, 0x22, 0x25, 0xdd, 0x2f, 0x64, 0xe5, 0xed, 0xb3, 0xa9, 0x94, 0xb3, 0x96, 0x88, 0x5d, 0x06, 0x41, 0x80, 0xf8, 0xe1, 0x3c, 0x8f, 0xa9, 0x5b, 0x44, 0x7e, 0x32, 0xbd, 0x62, 0x37, 0xe1, 0xde, 0x18, 0xe8, 0x12, 0x7d, 0x28, 0x7d, 0x5c, 0xcf, 0xa9, 0x16, 0x0f, 0xdc, 0xc1, 0x92, 0xe0, 0x43, 0xac, 0xd0, 0x25, 0x37, 0x8e, 0x5d, 0x4d, 0x26, 0x46, 0xbc, 0xc5, 0x22, 0x05, 0x29, 0x41, 0x53, 0x2f, 0x7a, 0x95, 0xa8, 0x36, 0xed, 0x85, 0xac, 0xf3, 0xde, 0x0c, 0xbe, 0xa9, 0xfa, 0xc4, 0xa6, 0x0b, 0x23, 0xfc, 0x7c, 0x77, 0xdc, 0x7c, 0x94, 0x9b, 0x7c, 0xe0, 0x3b, 0xa1, 0x66, 0x78, 0x85, 0x99, 0x5a, 0xba, 0x26, 0xa3, 0xac, 0x97, 0xd4, 0x3a, 0x33, 0xee, 0xa3, 0x96, 0xe0, 0x16, 0xdf, 0x61, 0xe7, 0x1f, 0x35, 0xa5, 0x47, 0x54, 0x51, 0xce, 0x93, 0x40, 0x6f, 0x40, 0x86, 0x3b, 0x17, 0x12, 0xd3, 0x4d, 0x2e, 0xb3, 0x04, 0xf8, 0x8b, 0x30, 0xb1, 0x27, 0xd7, 0xeb, 0xde, 0xd7, 0xa9, 0x06, 0xfe, 0x6b, 0x59, 0x8c, 0x5d, 0x9f, 0x93, 0x1f, 0x12, 0x65, 0xe6, 0xa6, 0xeb, 0x5d, 0x4b, 0x9a, 0x16, 0x85, 0xce, 0x18, 0x16, 0x5a, 0x5c, 0x3c, 0xeb, 0xc0, 0xe1, 0x58, 0x64, 0x06, 0x38, 0x1c, 0x66, 0x90, 0x4a, 0x30, 0xbe, 0x82, 0xe9, 0x9b, 0x40, 0x2e, 0x6a, 0x91, 0x4f, 0x48, 0xc2, 0x82, 0x40, 0xe9, 0xcd, 0x87, 0x77, 0x24, 0xa7, 0xdc, 0x26, 0x05, 0x18, 0x9c, 0x8b, 0x0e, 0x84, 0x29, 0x57, 0x76, 0x66, 0x7d, 0x1e, 0x39, 0xc2, 0xf6, 0x2f, 0xbb, 0xeb, 0x6e, 0x58, 0x3b, 0x11, 0x70, 0x75, 0xdb, 0xe9, 0xf8, 0xcb, 0xd4, 0x4c, 0x84, 0xb3, 0xcb, 0x66, 0x81, 0x4e, 0x93, 0xd9, 0x2f, 0xc5, 0x60, 0x53, 0x69, 0x6e, 0xf3, 0x8e, 0xa5, 0x6a, 0xa0, 0x96, 0xae, 0x31, 0xb6, 0x12, 0x91, 0x0e, 0xc4, 0xc9, 0xd0, 0x50, 0xf7, 0xbc, 0xe7, 0x78, 0xc9, 0x97, 0x02, 0x26, 0x6a, 0xe3, 0x9a, 0x16, 0x63, 0xa2, 0x5e, 0x1d, 0x4e, 0x71, 0x52, 0xb4, 0x73, 0x31, 0x27, 0x6c, 0x46, 0xe4, 0x67, 0x02, 0xde, 0x34, 0x7e, 0x24, 0x3b, 0xb9, 0xfe, 0x08, 0x7e, 0xe9, 0x0a, 0xdc, 0xe7, 0xc2, 0xa6, 0xa6, 0xb3, 0x7d, 0xe0, 0xa2, 0xe7, 0x6d, 0x2e, 0x33, 0xed, 0x47, 0xf7 }; /* prime - 2048 bits */ static uint8 diffie_hellman_prime_2048[] = { 0x00, 0xf0, 0x49, 0x65, 0x6d, 0x24, 0x61, 0xe6, 0x86, 0x8e, 0x57, 0x2b, 0x9b, 0x1c, 0x53, 0x2e, 0xef, 0xd2, 0x6e, 0xe5, 0x6c, 0xc4, 0x0c, 0x77, 0x1d, 0xce, 0xc7, 0xe0, 0x92, 0x78, 0x8b, 0x2b, 0x80, 0x9f, 0xc4, 0x59, 0xb5, 0x2e, 0xeb, 0x81, 0x8b, 0xfa, 0x08, 0x9f, 0x02, 0x5e, 0x94, 0x85, 0xab, 0xab, 0x08, 0x8a, 0x71, 0xb5, 0x0c, 0x26, 0x63, 0x2f, 0x34, 0x10, 0xdf, 0x32, 0x9a, 0xa1, 0xd5, 0xb5, 0xd7, 0xa1, 0x46, 0x24, 0x9a, 0xe3, 0x2a, 0xf1, 0x3a, 0x52, 0xc4, 0xa4, 0xe6, 0xa2, 0x29, 0x5e, 0x49, 0x0e, 0x2a, 0x4d, 0xad, 0xcd, 0x92, 0xb6, 0xa5, 0x25, 0xe5, 0x09, 0xae, 0x76, 0xe4, 0x19, 0xec, 0x29, 0x9b, 0x9b, 0xdb, 0x0c, 0xc8, 0x28, 0x1c, 0x49, 0x11, 0x45, 0x30, 0x51, 0x73, 0x31, 0x18, 0x9e, 0xa5, 0x89, 0x7d, 0x17, 0x22, 0xd5, 0x49, 0xaf, 0xf6, 0xe5, 0x00, 0x55, 0x7f, 0x2b, 0x33, 0x2d, 0x2f, 0x89, 0x73, 0x0b, 0x4d, 0x44, 0x72, 0xb1, 0x2e, 0xa3, 0x68, 0xbe, 0x52, 0x4e, 0x5a, 0x66, 0x36, 0xf9, 0x2c, 0xe7, 0xce, 0x92, 0x4d, 0x0c, 0xa3, 0xc7, 0x85, 0x7e, 0xe6, 0x97, 0x02, 0x8b, 0x0c, 0xcb, 0xf3, 0x6f, 0x2e, 0x04, 0xed, 0x6e, 0x75, 0xcf, 0xd1, 0xd4, 0x9f, 0xd3, 0x44, 0x3e, 0x5f, 0x81, 0xaa, 0xc1, 0xb8, 0xe2, 0xab, 0xed, 0x3b, 0xfc, 0xeb, 0x47, 0x48, 0xee, 0xe5, 0xfd, 0xc2, 0x79, 0x7a, 0x01, 0xe9, 0xab, 0xc6, 0x34, 0x65, 0x6a, 0x0a, 0x6c, 0xe8, 0x89, 0xa6, 0x96, 0xd2, 0x1e, 0xe5, 0xbe, 0x58, 0xf2, 0xcf, 0x17, 0xb8, 0x75, 0x43, 0xec, 0x0b, 0xb2, 0x91, 0x50, 0x93, 0x4c, 0xd2, 0xa3, 0xa4, 0x8a, 0x67, 0x23, 0x7f, 0x86, 0xac, 0xe3, 0x56, 0x9b, 0x18, 0x03, 0x03, 0x70, 0x50, 0x7b, 0x1a, 0x02, 0x22, 0x0b, 0x93, 0xc8, 0x9b, 0xa8, 0x8f }; typedef struct { int bits; MPI _prime; MPI _generator; gnutls_datum generator; gnutls_datum prime; int local; /* indicates if it is not malloced, !=0 indicated malloced */ } PRIME; /* Holds the prime to be used in DH authentication. * Initialy the MPIs are not calculated (must call global_init, or _gnutls_dh_calc_mpis()). */ static PRIME dh_primes[] = { {1024, NULL, NULL, {DH_G_1024, sizeof(DH_G_1024)} , {diffie_hellman_group1_prime, sizeof diffie_hellman_group1_prime} , 0} , {2048, NULL, NULL, {DH_G_2048, sizeof(DH_G_2048)} , {diffie_hellman_prime_2048, sizeof diffie_hellman_prime_2048} , 0} , {3072, NULL, NULL, {DH_G_3072, sizeof(DH_G_3072)} , {diffie_hellman_prime_3072, sizeof diffie_hellman_prime_3072} , 0} , {4096, NULL, NULL, {DH_G_4096, sizeof(DH_G_4096)} , {diffie_hellman_prime_4096, sizeof diffie_hellman_prime_4096} , 0} , {0, NULL, NULL, {NULL, 0} , {NULL, 0} , 0} }; /* This function takes a number of bits and returns a supported * number of bits. Ie a number of bits that we have a prime in the * dh_primes structure. */ static int supported_bits[] = { 1024, 2048, 3072, 4096, 0 }; static int normalize_bits(int bits) { if (bits >= 4096) bits = 4096; else if (bits <= 1024) bits = 1024; else if (bits <= 2048) bits = 2048; else if (bits <= 3072) bits = 3072; else if (bits <= 4096) bits = 4096; return bits; } /* Clears allocated MPIs and data. Only to be called at exit. */ void _gnutls_dh_clear_mpis() { int i; i = 0; do { _gnutls_mpi_release( &dh_primes[i]._prime); _gnutls_mpi_release( &dh_primes[i]._generator); if (dh_primes[i].local != 0) { gnutls_free( dh_primes[i].prime.data); gnutls_free( dh_primes[i].generator.data); } i++; } while (dh_primes[i].bits != 0); } /* Generates MPIs from opaque integer data. Initializes the dh_primes to * be used. */ int _gnutls_dh_calc_mpis() { int i, n; i = 0; do { n = dh_primes[i].prime.size; _gnutls_mpi_release( &dh_primes[i]._prime); if (_gnutls_mpi_scan(&dh_primes[i]._prime, dh_primes[i].prime.data, &n) || dh_primes[i]._prime == NULL) { gnutls_assert(); return GNUTLS_E_MPI_SCAN_FAILED; } n = dh_primes[i].generator.size; _gnutls_mpi_release( &dh_primes[i]._generator); if (_gnutls_mpi_scan(&dh_primes[i]._generator, dh_primes[i].generator.data, &n) || dh_primes[i]._generator == NULL) { gnutls_assert(); return GNUTLS_E_MPI_SCAN_FAILED; } i++; } while (dh_primes[i].bits != 0); return 0; } /* returns g and p, depends on the requested bits. * We only support limited key sizes. */ MPI gnutls_get_dh_params(MPI * ret_p, int bits) { MPI g=NULL, prime=NULL; int i; bits = normalize_bits(bits); i = 0; do { if (dh_primes[i].bits == bits) { prime = gcry_mpi_copy(dh_primes[i]._prime); g = gcry_mpi_copy(dh_primes[i]._generator); break; } i++; } while (dh_primes[i].bits != 0); if (prime==NULL || g==NULL) { /* if not prime was found */ gnutls_assert(); _gnutls_mpi_release( &g); _gnutls_mpi_release( &prime); *ret_p = NULL; return NULL; } if (ret_p) *ret_p = prime; return g; } /* These should be added in gcrypt.h */ MPI _gcry_generate_elg_prime(int mode, unsigned pbits, unsigned qbits, MPI g, MPI ** ret_factors); int _gnutls_dh_generate_prime(MPI * ret_g, MPI * ret_n, int bits) { MPI g, prime; int qbits; g = mpi_new(16); /* this should be ok */ if (g == NULL) { gnutls_assert(); return GNUTLS_E_MEMORY_ERROR; } /* generate a random prime */ /* this is an emulation of Michael Wiener's table * bad emulation. */ qbits = 120 + (((bits / 256) - 1) * 20); if (qbits & 1) /* better have a even one */ qbits++; prime = _gcry_generate_elg_prime(0, bits, qbits, g, NULL); if (prime == NULL || g == NULL) { _gnutls_mpi_release(&g); _gnutls_mpi_release(&prime); gnutls_assert(); return GNUTLS_E_MEMORY_ERROR; } if (ret_g) *ret_g = g; if (ret_n) *ret_n = prime; return 0; } /* returns a negative value if the bits is not supported */ static int check_bits(int bits) { int i=0; do { if (supported_bits[i]==bits) return 0; i++; } while(supported_bits[i]!=0); return GNUTLS_E_INVALID_PARAMETERS; } /* Replaces the prime in the static DH parameters, with a randomly * generated one. */ /** * gnutls_dh_replace_params - This function will replace the old DH parameters * @prime: holds the new prime * @generator: holds the new generator * @bits: is the prime's number of bits * * This function will replace the pair of prime and generator for use in * the Diffie-Hellman key exchange. The new parameters should be stored in the * appropriate gnutls_datum. This function should not be called while a key * exchange is in progress. * * Note that the bits value should be one of 1024, 2048, 3072 or 4096. * **/ int gnutls_dh_replace_params( gnutls_datum prime, gnutls_datum generator, int bits) { MPI tmp_prime, tmp_g; int siz, i; PRIME* sprime; if (check_bits(bits)<0) { gnutls_assert(); return GNUTLS_E_INVALID_PARAMETERS; } i = 0; do { if (dh_primes[i].bits==bits) { sprime = &dh_primes[i]; break; } } while(dh_primes[i].bits!=0); siz = prime.size; if (_gnutls_mpi_scan(&tmp_prime, prime.data, &siz)) { gnutls_assert(); return GNUTLS_E_MPI_SCAN_FAILED; } siz = generator.size; if (_gnutls_mpi_scan(&tmp_g, generator.data, &siz)) { _gnutls_mpi_release( &tmp_prime); gnutls_assert(); return GNUTLS_E_MPI_SCAN_FAILED; } /* copy the generated values to the structure */ if (sprime->local != 0) { gnutls_free(sprime->prime.data); _gnutls_mpi_release(&sprime->_prime); gnutls_free(sprime->generator.data); _gnutls_mpi_release(&sprime->_generator); } sprime->local = 1; sprime->_prime = gcry_mpi_copy(tmp_prime); sprime->_generator = gcry_mpi_copy(tmp_g); if (gnutls_set_datum( &sprime->prime, prime.data, prime.size) < 0) { gnutls_assert(); return GNUTLS_E_MEMORY_ERROR; } if (gnutls_set_datum( &sprime->prime, generator.data, generator.size) < 0) { gnutls_assert(); return GNUTLS_E_MEMORY_ERROR; } _gnutls_mpi_release(&tmp_g); _gnutls_mpi_release(&tmp_prime); return 0; } /* Generates a prime number and a generator, and returns 2 gnutls_datums that contain these * numbers. */ /** * gnutls_dh_generate_params - This function will generate new DH parameters * @prime: will hold the new prime * @generator: will hold the new generator * @bits: is the prime's number of bits * * This function will generate a new pair of prime and generator for use in * the Diffie-Hellman key exchange. The new parameters will be stored in the * appropriate gnutls_datum. This function is normally very slow. An other function * (gnutls_dh_replace_params()) should be called in order to replace the included * DH primes in the gnutls library. * * Note that the bits value should be one of 1024, 2048, 3072 or 4096. * Also note that the generation of new DH parameters is only usefull * to servers. Clients use the parameters sent by the server, thus it's * no use calling this in client side. * **/ int gnutls_dh_generate_params( gnutls_datum* prime, gnutls_datum* generator, int bits) { MPI tmp_prime, tmp_g; int siz; if (check_bits(bits)<0) { gnutls_assert(); return GNUTLS_E_INVALID_PARAMETERS; } if (_gnutls_dh_generate_prime(&tmp_g, &tmp_prime, bits) < 0) { gnutls_assert(); return GNUTLS_E_MEMORY_ERROR; } siz = 0; _gnutls_mpi_print( NULL, &siz, tmp_g); generator->data = gnutls_malloc(siz); if (generator->data == NULL) { _gnutls_mpi_release(&tmp_g); _gnutls_mpi_release(&tmp_prime); return GNUTLS_E_MEMORY_ERROR; } generator->size = siz; _gnutls_mpi_print( generator->data, &siz, tmp_g); siz = 0; _gnutls_mpi_print( NULL, &siz, tmp_prime); prime->data = gnutls_malloc(siz); if (prime->data == NULL) { gnutls_free( generator->data); _gnutls_mpi_release(&tmp_g); _gnutls_mpi_release(&tmp_prime); return GNUTLS_E_MEMORY_ERROR; } prime->size = siz; _gnutls_mpi_print( prime->data, &siz, tmp_prime); return 0; }