| /* |
| Copyright (C) 2006, 2009 by Werner Dittmann |
| |
| This 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 |
| |
| * In addition, as a special exception, the copyright holders give |
| * permission to link the code of portions of this program with the |
| * OpenSSL library under certain conditions as described in each |
| * individual source file, and distribute linked combinations |
| * including the two. |
| * You must obey the GNU General Public License in all respects |
| * for all of the code used other than OpenSSL. If you modify |
| * file(s) with this exception, you may extend this exception to your |
| * version of the file(s), but you are not obligated to do so. If you |
| * do not wish to do so, delete this exception statement from your |
| * version. If you delete this exception statement from all source |
| * files in the program, then also delete it here. |
| */ |
| |
| /** Copyright (C) 2006, 2009 |
| * |
| * @author Werner Dittmann <Werner.Dittmann@t-online.de> |
| */ |
| |
| #include <string.h> |
| |
| #include <openssl/crypto.h> |
| #include <openssl/bio.h> |
| #include <openssl/bn.h> |
| #include <openssl/rand.h> |
| #include <openssl/err.h> |
| #include <openssl/dh.h> |
| #include <openssl/evp.h> |
| #include <openssl/ec.h> |
| #include <openssl/ecdh.h> |
| |
| #include <zrtp/crypto/zrtpDH.h> |
| #include <zrtp/libzrtpcpp/ZrtpTextData.h> |
| |
| // extern void initializeOpenSSL(); |
| |
| static BIGNUM* bnP2048 = NULL; |
| static BIGNUM* bnP3072 = NULL; |
| // static BIGNUM* bnP4096 = NULL; |
| |
| static BIGNUM* bnP2048MinusOne = NULL; |
| static BIGNUM* bnP3072MinusOne = NULL; |
| // static BIGNUM* bnP4096MinusOne = NULL; |
| |
| static uint8_t dhinit = 0; |
| |
| void randomZRTP(uint8_t *buf, int32_t length) |
| { |
| // initializeOpenSSL(); |
| RAND_bytes(buf, length); |
| } |
| |
| static const uint8_t P2048[] = |
| { |
| 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, 0xE4, 0x5B, 0x3D, |
| 0xC2, 0x00, 0x7C, 0xB8, 0xA1, 0x63, 0xBF, 0x05, 0x98, 0xDA, 0x48, 0x36, |
| 0x1C, 0x55, 0xD3, 0x9A, 0x69, 0x16, 0x3F, 0xA8, 0xFD, 0x24, 0xCF, 0x5F, |
| 0x83, 0x65, 0x5D, 0x23, 0xDC, 0xA3, 0xAD, 0x96, 0x1C, 0x62, 0xF3, 0x56, |
| 0x20, 0x85, 0x52, 0xBB, 0x9E, 0xD5, 0x29, 0x07, 0x70, 0x96, 0x96, 0x6D, |
| 0x67, 0x0C, 0x35, 0x4E, 0x4A, 0xBC, 0x98, 0x04, 0xF1, 0x74, 0x6C, 0x08, |
| 0xCA, 0x18, 0x21, 0x7C, 0x32, 0x90, 0x5E, 0x46, 0x2E, 0x36, 0xCE, 0x3B, |
| 0xE3, 0x9E, 0x77, 0x2C, 0x18, 0x0E, 0x86, 0x03, 0x9B, 0x27, 0x83, 0xA2, |
| 0xEC, 0x07, 0xA2, 0x8F, 0xB5, 0xC5, 0x5D, 0xF0, 0x6F, 0x4C, 0x52, 0xC9, |
| 0xDE, 0x2B, 0xCB, 0xF6, 0x95, 0x58, 0x17, 0x18, 0x39, 0x95, 0x49, 0x7C, |
| 0xEA, 0x95, 0x6A, 0xE5, 0x15, 0xD2, 0x26, 0x18, 0x98, 0xFA, 0x05, 0x10, |
| 0x15, 0x72, 0x8E, 0x5A, 0x8A, 0xAC, 0xAA, 0x68, 0xFF, 0xFF, 0xFF, 0xFF, |
| 0xFF, 0xFF, 0xFF, 0xFF |
| }; |
| |
| static const uint8_t P3072[] = |
| { |
| 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, 0xE4, 0x5B, 0x3D, |
| 0xC2, 0x00, 0x7C, 0xB8, 0xA1, 0x63, 0xBF, 0x05, 0x98, 0xDA, 0x48, 0x36, |
| 0x1C, 0x55, 0xD3, 0x9A, 0x69, 0x16, 0x3F, 0xA8, 0xFD, 0x24, 0xCF, 0x5F, |
| 0x83, 0x65, 0x5D, 0x23, 0xDC, 0xA3, 0xAD, 0x96, 0x1C, 0x62, 0xF3, 0x56, |
| 0x20, 0x85, 0x52, 0xBB, 0x9E, 0xD5, 0x29, 0x07, 0x70, 0x96, 0x96, 0x6D, |
| 0x67, 0x0C, 0x35, 0x4E, 0x4A, 0xBC, 0x98, 0x04, 0xF1, 0x74, 0x6C, 0x08, |
| 0xCA, 0x18, 0x21, 0x7C, 0x32, 0x90, 0x5E, 0x46, 0x2E, 0x36, 0xCE, 0x3B, |
| 0xE3, 0x9E, 0x77, 0x2C, 0x18, 0x0E, 0x86, 0x03, 0x9B, 0x27, 0x83, 0xA2, |
| 0xEC, 0x07, 0xA2, 0x8F, 0xB5, 0xC5, 0x5D, 0xF0, 0x6F, 0x4C, 0x52, 0xC9, |
| 0xDE, 0x2B, 0xCB, 0xF6, 0x95, 0x58, 0x17, 0x18, 0x39, 0x95, 0x49, 0x7C, |
| 0xEA, 0x95, 0x6A, 0xE5, 0x15, 0xD2, 0x26, 0x18, 0x98, 0xFA, 0x05, 0x10, |
| 0x15, 0x72, 0x8E, 0x5A, 0x8A, 0xAA, 0xC4, 0x2D, 0xAD, 0x33, 0x17, 0x0D, |
| 0x04, 0x50, 0x7A, 0x33, 0xA8, 0x55, 0x21, 0xAB, 0xDF, 0x1C, 0xBA, 0x64, |
| 0xEC, 0xFB, 0x85, 0x04, 0x58, 0xDB, 0xEF, 0x0A, 0x8A, 0xEA, 0x71, 0x57, |
| 0x5D, 0x06, 0x0C, 0x7D, 0xB3, 0x97, 0x0F, 0x85, 0xA6, 0xE1, 0xE4, 0xC7, |
| 0xAB, 0xF5, 0xAE, 0x8C, 0xDB, 0x09, 0x33, 0xD7, 0x1E, 0x8C, 0x94, 0xE0, |
| 0x4A, 0x25, 0x61, 0x9D, 0xCE, 0xE3, 0xD2, 0x26, 0x1A, 0xD2, 0xEE, 0x6B, |
| 0xF1, 0x2F, 0xFA, 0x06, 0xD9, 0x8A, 0x08, 0x64, 0xD8, 0x76, 0x02, 0x73, |
| 0x3E, 0xC8, 0x6A, 0x64, 0x52, 0x1F, 0x2B, 0x18, 0x17, 0x7B, 0x20, 0x0C, |
| 0xBB, 0xE1, 0x17, 0x57, 0x7A, 0x61, 0x5D, 0x6C, 0x77, 0x09, 0x88, 0xC0, |
| 0xBA, 0xD9, 0x46, 0xE2, 0x08, 0xE2, 0x4F, 0xA0, 0x74, 0xE5, 0xAB, 0x31, |
| 0x43, 0xDB, 0x5B, 0xFC, 0xE0, 0xFD, 0x10, 0x8E, 0x4B, 0x82, 0xD1, 0x20, |
| 0xA9, 0x3A, 0xD2, 0xCA, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF |
| }; |
| |
| /* ************** |
| static const uint8_t P4096[] = |
| { |
| 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, 0xE4, 0x5B, 0x3D, |
| 0xC2, 0x00, 0x7C, 0xB8, 0xA1, 0x63, 0xBF, 0x05, 0x98, 0xDA, 0x48, 0x36, |
| 0x1C, 0x55, 0xD3, 0x9A, 0x69, 0x16, 0x3F, 0xA8, 0xFD, 0x24, 0xCF, 0x5F, |
| 0x83, 0x65, 0x5D, 0x23, 0xDC, 0xA3, 0xAD, 0x96, 0x1C, 0x62, 0xF3, 0x56, |
| 0x20, 0x85, 0x52, 0xBB, 0x9E, 0xD5, 0x29, 0x07, 0x70, 0x96, 0x96, 0x6D, |
| 0x67, 0x0C, 0x35, 0x4E, 0x4A, 0xBC, 0x98, 0x04, 0xF1, 0x74, 0x6C, 0x08, |
| 0xCA, 0x18, 0x21, 0x7C, 0x32, 0x90, 0x5E, 0x46, 0x2E, 0x36, 0xCE, 0x3B, |
| 0xE3, 0x9E, 0x77, 0x2C, 0x18, 0x0E, 0x86, 0x03, 0x9B, 0x27, 0x83, 0xA2, |
| 0xEC, 0x07, 0xA2, 0x8F, 0xB5, 0xC5, 0x5D, 0xF0, 0x6F, 0x4C, 0x52, 0xC9, |
| 0xDE, 0x2B, 0xCB, 0xF6, 0x95, 0x58, 0x17, 0x18, 0x39, 0x95, 0x49, 0x7C, |
| 0xEA, 0x95, 0x6A, 0xE5, 0x15, 0xD2, 0x26, 0x18, 0x98, 0xFA, 0x05, 0x10, |
| 0x15, 0x72, 0x8E, 0x5A, 0x8A, 0xAA, 0xC4, 0x2D, 0xAD, 0x33, 0x17, 0x0D, |
| 0x04, 0x50, 0x7A, 0x33, 0xA8, 0x55, 0x21, 0xAB, 0xDF, 0x1C, 0xBA, 0x64, |
| 0xEC, 0xFB, 0x85, 0x04, 0x58, 0xDB, 0xEF, 0x0A, 0x8A, 0xEA, 0x71, 0x57, |
| 0x5D, 0x06, 0x0C, 0x7D, 0xB3, 0x97, 0x0F, 0x85, 0xA6, 0xE1, 0xE4, 0xC7, |
| 0xAB, 0xF5, 0xAE, 0x8C, 0xDB, 0x09, 0x33, 0xD7, 0x1E, 0x8C, 0x94, 0xE0, |
| 0x4A, 0x25, 0x61, 0x9D, 0xCE, 0xE3, 0xD2, 0x26, 0x1A, 0xD2, 0xEE, 0x6B, |
| 0xF1, 0x2F, 0xFA, 0x06, 0xD9, 0x8A, 0x08, 0x64, 0xD8, 0x76, 0x02, 0x73, |
| 0x3E, 0xC8, 0x6A, 0x64, 0x52, 0x1F, 0x2B, 0x18, 0x17, 0x7B, 0x20, 0x0C, |
| 0xBB, 0xE1, 0x17, 0x57, 0x7A, 0x61, 0x5D, 0x6C, 0x77, 0x09, 0x88, 0xC0, |
| 0xBA, 0xD9, 0x46, 0xE2, 0x08, 0xE2, 0x4F, 0xA0, 0x74, 0xE5, 0xAB, 0x31, |
| 0x43, 0xDB, 0x5B, 0xFC, 0xE0, 0xFD, 0x10, 0x8E, 0x4B, 0x82, 0xD1, 0x20, |
| 0xA9, 0x21, 0x08, 0x01, 0x1A, 0x72, 0x3C, 0x12, 0xA7, 0x87, 0xE6, 0xD7, |
| 0x88, 0x71, 0x9A, 0x10, 0xBD, 0xBA, 0x5B, 0x26, 0x99, 0xC3, 0x27, 0x18, |
| 0x6A, 0xF4, 0xE2, 0x3C, 0x1A, 0x94, 0x68, 0x34, 0xB6, 0x15, 0x0B, 0xDA, |
| 0x25, 0x83, 0xE9, 0xCA, 0x2A, 0xD4, 0x4C, 0xE8, 0xDB, 0xBB, 0xC2, 0xDB, |
| 0x04, 0xDE, 0x8E, 0xF9, 0x2E, 0x8E, 0xFC, 0x14, 0x1F, 0xBE, 0xCA, 0xA6, |
| 0x28, 0x7C, 0x59, 0x47, 0x4E, 0x6B, 0xC0, 0x5D, 0x99, 0xB2, 0x96, 0x4F, |
| 0xA0, 0x90, 0xC3, 0xA2, 0x23, 0x3B, 0xA1, 0x86, 0x51, 0x5B, 0xE7, 0xED, |
| 0x1F, 0x61, 0x29, 0x70, 0xCE, 0xE2, 0xD7, 0xAF, 0xB8, 0x1B, 0xDD, 0x76, |
| 0x21, 0x70, 0x48, 0x1C, 0xD0, 0x06, 0x91, 0x27, 0xD5, 0xB0, 0x5A, 0xA9, |
| 0x93, 0xB4, 0xEA, 0x98, 0x8D, 0x8F, 0xDD, 0xC1, 0x86, 0xFF, 0xB7, 0xDC, |
| 0x90, 0xA6, 0xC0, 0x8F, 0x4D, 0xF4, 0x35, 0xC9, 0x34, 0x06, 0x31, 0x99, |
| 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF |
| }; |
| *************** */ |
| |
| ZrtpDH::ZrtpDH(const char* type) { |
| |
| uint8_t random[64]; |
| |
| // Well - the algo type is only 4 char thus cast to int32 and compare |
| if (*(int32_t*)type == *(int32_t*)dh2k) { |
| pkType = DH2K; |
| } |
| else if (*(int32_t*)type == *(int32_t*)dh3k) { |
| pkType = DH3K; |
| } |
| else if (*(int32_t*)type == *(int32_t*)ec25) { |
| pkType = EC25; |
| } |
| else if (*(int32_t*)type == *(int32_t*)ec38) { |
| pkType = EC38; |
| } |
| else { |
| return; |
| } |
| |
| // initializeOpenSSL(); |
| |
| if (!dhinit) { |
| bnP2048 = BN_bin2bn(P2048,sizeof(P2048),NULL); |
| bnP3072 = BN_bin2bn(P3072,sizeof(P3072),NULL); |
| // bnP4096 = BN_bin2bn(P4096,sizeof(P4096),NULL); |
| |
| bnP2048MinusOne = BN_dup(bnP2048); |
| BN_sub_word(bnP2048MinusOne, 1); |
| |
| bnP3072MinusOne = BN_dup(bnP3072); |
| BN_sub_word(bnP3072MinusOne, 1); |
| |
| // bnP4096MinusOne = BN_dup(bnP4096); |
| // BN_sub_word(bnP4096MinusOne, 1); |
| dhinit = 1; |
| } |
| |
| DH* tmpCtx = NULL; |
| switch (pkType) { |
| case DH2K: |
| case DH3K: |
| ctx = static_cast<void*>(DH_new()); |
| tmpCtx = static_cast<DH*>(ctx); |
| tmpCtx->g = BN_new(); |
| BN_set_word(tmpCtx->g, DH_GENERATOR_2); |
| |
| if (pkType == DH2K) { |
| tmpCtx->p = BN_dup(bnP2048); |
| RAND_bytes(random, 32); |
| tmpCtx->priv_key = BN_bin2bn(random, 32, NULL); |
| } |
| else if (pkType == DH3K) { |
| tmpCtx->p = BN_dup(bnP3072); |
| RAND_bytes(random, 64); |
| tmpCtx->priv_key = BN_bin2bn(random, 32, NULL); |
| } |
| break; |
| |
| case EC25: |
| ctx = static_cast<void*>(EC_KEY_new_by_curve_name(NID_X9_62_prime256v1)); |
| break; |
| case EC38: |
| ctx = static_cast<void*>(EC_KEY_new_by_curve_name(NID_secp384r1)); |
| break; |
| } |
| } |
| |
| ZrtpDH::~ZrtpDH() { |
| if (ctx == NULL) |
| return; |
| |
| switch (pkType) { |
| case DH2K: |
| case DH3K: |
| DH_free(static_cast<DH*>(ctx)); |
| break; |
| |
| case EC25: |
| case EC38: |
| EC_KEY_free(static_cast<EC_KEY*>(ctx)); |
| break; |
| } |
| } |
| |
| int32_t ZrtpDH::computeSecretKey(uint8_t *pubKeyBytes, uint8_t *secret) { |
| |
| if (pkType == DH2K || pkType == DH3K) { |
| DH* tmpCtx = static_cast<DH*>(ctx); |
| |
| if (tmpCtx->pub_key != NULL) { |
| BN_free(tmpCtx->pub_key); |
| } |
| tmpCtx->pub_key = BN_bin2bn(pubKeyBytes, getDhSize(), NULL); |
| return DH_compute_key(secret, tmpCtx->pub_key, tmpCtx); |
| } |
| if (pkType == EC25 || pkType == EC38) { |
| uint8_t buffer[100]; |
| int32_t ret; |
| int32_t len = getPubKeySize(); |
| |
| buffer[0] = POINT_CONVERSION_UNCOMPRESSED; |
| memcpy(buffer+1, pubKeyBytes, len); |
| |
| EC_POINT* point = EC_POINT_new(EC_KEY_get0_group(static_cast<EC_KEY*>(ctx))); |
| EC_POINT_oct2point(EC_KEY_get0_group(static_cast<EC_KEY*>(ctx)), |
| point, buffer, len+1, NULL); |
| ret = ECDH_compute_key(secret, getDhSize(), point, static_cast<EC_KEY*>(ctx), NULL); |
| EC_POINT_free(point); |
| return ret; |
| } |
| return -1; |
| } |
| |
| int32_t ZrtpDH::generatePublicKey() |
| { |
| if (pkType == DH2K || pkType == DH3K) |
| return DH_generate_key(static_cast<DH*>(ctx)); |
| |
| if (pkType == EC25 || pkType == EC38) |
| return EC_KEY_generate_key(static_cast<EC_KEY*>(ctx)); |
| return 0; |
| } |
| |
| int32_t ZrtpDH::getDhSize() const |
| { |
| if (pkType == DH2K || pkType == DH3K) |
| return DH_size(static_cast<DH*>(ctx)); |
| |
| if (pkType == EC25) |
| return 32; |
| if (pkType == EC38) |
| return 48; |
| |
| return 0; |
| } |
| |
| int32_t ZrtpDH::getPubKeySize() const |
| { |
| if (pkType == DH2K || pkType == DH3K) |
| return BN_num_bytes(static_cast<DH*>(ctx)->pub_key); |
| |
| if (pkType == EC25 || pkType == EC38) |
| return EC_POINT_point2oct(EC_KEY_get0_group(static_cast<EC_KEY*>(ctx)), |
| EC_KEY_get0_public_key(static_cast<EC_KEY*>(ctx)), |
| POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL) - 1; |
| return 0; |
| |
| } |
| |
| int32_t ZrtpDH::getPubKeyBytes(uint8_t *buf) const |
| { |
| |
| if (pkType == DH2K || pkType == DH3K) { |
| // get len of pub_key, prepend with zeros to DH size |
| int32_t prepend = getDhSize() - getPubKeySize(); |
| if (prepend > 0) { |
| memset(buf, 0, prepend); |
| } |
| return BN_bn2bin(static_cast<DH*>(ctx)->pub_key, buf + prepend); |
| } |
| if (pkType == EC25 || pkType == EC38) { |
| uint8_t buffer[100]; |
| |
| int len = EC_POINT_point2oct(EC_KEY_get0_group(static_cast<EC_KEY*>(ctx)), |
| EC_KEY_get0_public_key(static_cast<EC_KEY*>(ctx)), |
| POINT_CONVERSION_UNCOMPRESSED, buffer, 100, NULL); |
| memcpy(buf, buffer+1, len-1); |
| return len-1; |
| } |
| return 0; |
| } |
| |
| int32_t ZrtpDH::checkPubKey(uint8_t *pubKeyBytes) const |
| { |
| if (pkType == EC25 || pkType == EC38) { |
| uint8_t buffer[100]; |
| int32_t ret; |
| int32_t len = getPubKeySize(); |
| |
| buffer[0] = POINT_CONVERSION_UNCOMPRESSED; |
| memcpy(buffer+1, pubKeyBytes, len); |
| |
| EC_POINT* point = EC_POINT_new(EC_KEY_get0_group(static_cast<EC_KEY*>(ctx))); |
| EC_POINT_oct2point(EC_KEY_get0_group(static_cast<EC_KEY*>(ctx)), |
| point, buffer, len+1, NULL); |
| EC_KEY* chkKey = EC_KEY_new(); |
| EC_KEY_set_group(chkKey, EC_KEY_get0_group(static_cast<EC_KEY*>(ctx))); |
| EC_KEY_set_public_key(chkKey, point); |
| ret = EC_KEY_check_key(chkKey); |
| |
| EC_POINT_free(point); |
| EC_KEY_free(chkKey); |
| |
| return ret; |
| } |
| |
| BIGNUM* pubKeyOther = BN_bin2bn(pubKeyBytes, getDhSize(), NULL); |
| |
| if (pkType == DH2K) { |
| if (BN_cmp(bnP2048MinusOne, pubKeyOther) == 0) |
| return 0; |
| } |
| else if (pkType == DH3K) { |
| if (BN_cmp(bnP3072MinusOne, pubKeyOther) == 0) |
| return 0; |
| } |
| else { |
| // if (BN_cmp(bnP4096MinusOne, pubKeyOther) == 0) |
| return 0; |
| } |
| int one = BN_is_one(pubKeyOther); |
| if (one == 1) |
| return 0; |
| |
| BN_free(pubKeyOther); |
| return 1; |
| } |
| |
| const char* ZrtpDH::getDHtype() |
| { |
| switch (pkType) { |
| case DH2K: |
| return dh2k; |
| break; |
| case DH3K: |
| return dh3k; |
| break; |
| case EC25: |
| return ec25; |
| break; |
| case EC38: |
| return ec38; |
| break; |
| } |
| return NULL; |
| } |
| |
| /** EMACS ** |
| * Local variables: |
| * mode: c++ |
| * c-default-style: ellemtel |
| * c-basic-offset: 4 |
| * End: |
| */ |