| /* |
| Copyright (C) 2006-2007 Werner Dittmann |
| |
| This program 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 3 of the License, or |
| (at your option) any later version. |
| |
| This program 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, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| /** Copyright (C) 2006, 2007 |
| * |
| * @author Werner Dittmann <Werner.Dittmann@t-online.de> |
| */ |
| |
| #include <gcrypt.h> |
| #include <libzrtpcpp/crypto/aesCFB.h> |
| |
| |
| extern void initializeGcrypt(); |
| |
| void aesCfbEncrypt(uint8_t* key, int32_t keyLength, uint8_t* IV, uint8_t *data, |
| int32_t dataLength) |
| { |
| gcry_error_t err = 0; |
| int algo; |
| |
| initializeGcrypt(); |
| |
| if (keyLength == 16) { |
| algo = GCRY_CIPHER_AES; |
| } |
| else if (keyLength == 32) { |
| algo = GCRY_CIPHER_AES256; |
| } |
| else { |
| return; |
| } |
| gcry_cipher_hd_t tmp; |
| err = gcry_cipher_open(&tmp, algo, GCRY_CIPHER_MODE_CFB, 0); |
| err = gcry_cipher_setkey(tmp, key, keyLength); |
| err = gcry_cipher_setiv (tmp, IV, AES_BLOCK_SIZE); |
| err = gcry_cipher_encrypt (tmp, data, dataLength, data, dataLength); |
| gcry_cipher_close(tmp); |
| } |
| |
| void aesCfbDecrypt(uint8_t* key, int32_t keyLength, const uint8_t* IV, uint8_t *data, |
| int32_t dataLength) |
| { |
| gcry_error_t err = 0; |
| int algo; |
| |
| initializeGcrypt(); |
| |
| if (keyLength == 16) { |
| algo = GCRY_CIPHER_AES; |
| } |
| else if (keyLength == 32) { |
| algo = GCRY_CIPHER_AES256; |
| } |
| else { |
| return; |
| } |
| gcry_cipher_hd_t tmp; |
| err = gcry_cipher_open(&tmp, algo, GCRY_CIPHER_MODE_CFB, 0); |
| err = gcry_cipher_setkey(tmp, key, keyLength); |
| err = gcry_cipher_setiv (tmp, IV, AES_BLOCK_SIZE); |
| err = gcry_cipher_decrypt (tmp, data, dataLength, data, dataLength); |
| gcry_cipher_close(tmp); |
| } |