/* * Copyright (C) 2000,2001 Nikos Mavroyanopoulos * * This file is part of GNUTLS. * * The GNUTLS library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include #include #include #include "debug.h" static uint8 DH_G_1024[] = { 0x05 }; static uint8 DH_G_4096[] = { 0x05 }; static uint8 DH_G_2048[] = { 0x05 }; static uint8 DH_G_3072[] = { 0x0D }; static uint8 diffie_hellman_prime_1024[128] = { 0xe3, 0x79, 0xb5, 0xa7, 0x47, 0x4c, 0xfd, 0x9c, 0x78, 0xfe, 0x17, 0x87, 0x44, 0xc4, 0x86, 0x2b, 0x92, 0x13, 0x43, 0xf5, 0xac, 0x72, 0xd2, 0xf1, 0x2a, 0xf5, 0x39, 0xa2, 0x79, 0x01, 0xdd, 0x4c, 0x7e, 0x5b, 0xa0, 0x19, 0x11, 0xd4, 0x2f, 0x0a, 0x92, 0x8d, 0xfd, 0xde, 0x85, 0x93, 0x99, 0xad, 0xe0, 0xd4, 0x0b, 0x62, 0xaa, 0x86, 0xa7, 0xd7, 0x63, 0x2e, 0x35, 0x96, 0x88, 0xbe, 0x52, 0x2e, 0x8c, 0x27, 0xf0, 0xe0, 0xa1, 0x0e, 0xb7, 0xb9, 0xc8, 0xbd, 0x5d, 0xe8, 0xdb, 0x63, 0xd8, 0xb4, 0xe7, 0x0d, 0xff, 0x0f, 0x55, 0xe7, 0x27, 0x0d, 0xb7, 0x57, 0x33, 0x30, 0xd6, 0xeb, 0x51, 0x99, 0x86, 0x17, 0x5b, 0x48, 0xb3, 0x0c, 0xae, 0xbd, 0xa1, 0x83, 0x6b, 0xbd, 0x9f, 0x83, 0x83, 0x2b, 0x46, 0x3e, 0x18, 0xa4, 0x4d, 0x82, 0x95, 0xa4, 0x08, 0xdd, 0x28, 0x0c, 0x4f, 0x93, 0xfd, 0xd7 }; /* 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 }; /* Holds the prime to be used in DH authentication. * Initialy the GNUTLS_MPIs are not calculated (must call global_init, or _gnutls_dh_calc_mpis()). */ _gnutls_dh_params _gnutls_dh_default_params[] = { {768, NULL, NULL, {DH_G_1024, sizeof(DH_G_1024)} , {diffie_hellman_prime_1024, sizeof diffie_hellman_prime_1024} , 0} , {1024, NULL, NULL, {DH_G_1024, sizeof(DH_G_1024)} , {diffie_hellman_prime_1024, sizeof diffie_hellman_prime_1024} , 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} }; static const _gnutls_dh_params _gnutls_dh_copy_params[] = { {768, NULL, NULL, {DH_G_1024, sizeof(DH_G_1024)} , {diffie_hellman_prime_1024, sizeof diffie_hellman_prime_1024} , 0} , {1024, NULL, NULL, {DH_G_1024, sizeof(DH_G_1024)} , {diffie_hellman_prime_1024, sizeof diffie_hellman_prime_1024} , 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 const int supported_bits[] = { 768, 1024, 2048, 3072, 4096, 0 }; static int normalize_bits(int bits) { if (bits >= 4096) bits = 4096; else if (bits <= 768) bits = 768; 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 GNUTLS_MPIs and data. Only to be called at exit. */ void _gnutls_dh_clear_mpis(void) { int i; if (_gnutls_dh_default_params == NULL) return; i = 0; do { _gnutls_mpi_release(&_gnutls_dh_default_params[i]._prime); _gnutls_mpi_release(&_gnutls_dh_default_params[i]. _generator); if (_gnutls_dh_default_params[i].local != 0) { gnutls_free(_gnutls_dh_default_params[i].prime. data); gnutls_free(_gnutls_dh_default_params[i].generator. data); } i++; } while (_gnutls_dh_default_params[i].bits != 0); } /* Generates GNUTLS_MPIs from opaque integer data. Initializes the dh_primes to * be used. */ int _gnutls_dh_calc_mpis(void) { int i; size_t n; if (_gnutls_dh_default_params == NULL) { gnutls_assert(); return GNUTLS_E_INVALID_REQUEST; } i = 0; do { n = _gnutls_dh_default_params[i].prime.size; _gnutls_mpi_release(&_gnutls_dh_default_params[i]._prime); if (_gnutls_mpi_scan (&_gnutls_dh_default_params[i]._prime, _gnutls_dh_default_params[i].prime.data, &n) || _gnutls_dh_default_params[i]._prime == NULL) { gnutls_assert(); return GNUTLS_E_MPI_SCAN_FAILED; } n = _gnutls_dh_default_params[i].generator.size; _gnutls_mpi_release(&_gnutls_dh_default_params[i]. _generator); if (_gnutls_mpi_scan (&_gnutls_dh_default_params[i]._generator, _gnutls_dh_default_params[i].generator.data, &n) || _gnutls_dh_default_params[i]._generator == NULL) { gnutls_assert(); return GNUTLS_E_MPI_SCAN_FAILED; } i++; } while (_gnutls_dh_default_params[i].bits != 0); return 0; } /* returns g and p, depends on the requested bits. * We only support limited key sizes. */ GNUTLS_MPI gnutls_get_dh_params(gnutls_dh_params dh_primes, GNUTLS_MPI * ret_p, int bits) { GNUTLS_MPI g = NULL, prime = NULL; int i; if (dh_primes == NULL) { gnutls_assert(); return NULL; } bits = normalize_bits(bits); i = 0; do { if (dh_primes[i].bits == bits) { prime = _gnutls_mpi_copy(dh_primes[i]._prime); g = _gnutls_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; } /* returns g and p, depends on the requested bits. * We only support limited key sizes. */ int _gnutls_get_rnd_srp_params(gnutls_datum *g, gnutls_datum* p, int bits) { int i; if (_gnutls_dh_default_params == NULL) { gnutls_assert(); return GNUTLS_E_INTERNAL_ERROR; } g->data = p->data = NULL; g->size = p->size = 0; bits = normalize_bits(bits); i = 0; do { if (_gnutls_dh_default_params[i].bits == bits) { if (_gnutls_set_datum( p, _gnutls_dh_default_params[i].prime.data, _gnutls_dh_default_params[i].prime.size) < 0) { return GNUTLS_E_MEMORY_ERROR; } if (_gnutls_set_datum( g, _gnutls_dh_default_params[i].generator.data, _gnutls_dh_default_params[i].generator.size) < 0) { _gnutls_free_datum( p); return GNUTLS_E_MEMORY_ERROR; } break; } i++; } while (_gnutls_dh_default_params[i].bits != 0); if (g->data == NULL || p->data == NULL) { gnutls_assert(); _gnutls_free_datum(g); _gnutls_free_datum(p); return GNUTLS_E_INTERNAL_ERROR; } return 0; } /* These should be added in gcrypt.h */ GNUTLS_MPI _gcry_generate_elg_prime(int mode, unsigned pbits, unsigned qbits, GNUTLS_MPI g, GNUTLS_MPI ** ret_factors); int _gnutls_dh_generate_prime(GNUTLS_MPI * ret_g, GNUTLS_MPI * ret_n, int bits) { GNUTLS_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); gnutls_assert(); return GNUTLS_E_INVALID_REQUEST; } /* Replaces the prime in the static DH parameters, with a randomly * generated one. */ /** * gnutls_dh_params_set - This function will replace the old DH parameters * @dh_params: Is a structure will hold the prime numbers * @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. * * Note that the bits value should be one of 768, 1024, 2048, 3072 or 4096. * **/ int gnutls_dh_params_set(gnutls_dh_params dh_params, gnutls_datum prime, gnutls_datum generator, int bits) { GNUTLS_MPI tmp_prime, tmp_g; int i = 0; gnutls_dh_params sprime=NULL; size_t siz = 0; if (check_bits(bits) < 0) { gnutls_assert(); return GNUTLS_E_INVALID_REQUEST; } i = 0; do { if (dh_params[i].bits == bits) { sprime = &dh_params[i]; break; } } while (dh_params[++i].bits != 0); /* sprime is not null, because of the check_bits() * above. */ 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 = tmp_prime; sprime->_generator = tmp_g; sprime->generator.data = NULL; sprime->prime.data = NULL; if (_gnutls_set_datum(&sprime->prime, prime.data, prime.size) < 0) { gnutls_assert(); return GNUTLS_E_MEMORY_ERROR; } if (_gnutls_set_datum (&sprime->generator, generator.data, generator.size) < 0) { gnutls_assert(); return GNUTLS_E_MEMORY_ERROR; } return 0; } /** * gnutls_dh_params_init - This function will initialize the DH parameters * @dh_params: Is a structure that will hold the prime numbers * * This function will initialize the DH parameters structure. * **/ int gnutls_dh_params_init(gnutls_dh_params * dh_params) { (*dh_params) = gnutls_calloc(1, sizeof(_gnutls_dh_copy_params)); if (*dh_params == NULL) { gnutls_assert(); return GNUTLS_E_MEMORY_ERROR; } memcpy((*dh_params), _gnutls_dh_copy_params, sizeof(_gnutls_dh_copy_params)); return 0; } /** * gnutls_dh_params_deinit - This function will deinitialize the DH parameters * @dh_params: Is a structure that holds the prime numbers * * This function will deinitialize the DH parameters structure. * **/ void gnutls_dh_params_deinit(gnutls_dh_params dh_params) { int i; if (dh_params == NULL) return; i = 0; do { _gnutls_mpi_release(&dh_params[i]._prime); _gnutls_mpi_release(&dh_params[i]._generator); if (dh_params[i].local != 0) { gnutls_free(dh_params[i].prime.data); gnutls_free(dh_params[i].generator.data); } i++; } while (dh_params[i].bits != 0); gnutls_free(dh_params); } /* Generates a prime number and a generator, and returns 2 gnutls_datums that contain these * numbers. */ /** * gnutls_dh_params_generate - 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 allocated using * malloc and will be stored in the appropriate datum. * This function is normally very slow. An other function * (gnutls_dh_params_set()) should be called in order to replace the * included DH primes in the gnutls library. * * Note that the bits value should be one of 768, 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_params_generate(gnutls_datum * prime, gnutls_datum * generator, int bits) { GNUTLS_MPI tmp_prime, tmp_g; size_t siz; if (check_bits(bits) < 0) { gnutls_assert(); return GNUTLS_E_INVALID_REQUEST; } 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 = 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 = 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); _gnutls_log("Generated %d bits prime %s, generator %s.\n", bits, _gnutls_bin2hex(prime->data, prime->size), _gnutls_bin2hex(generator->data, generator->size)); return 0; }