| /* |
| * DES encryption/decryption |
| * Copyright (c) 2007 Reimar Doeffinger |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef AVUTIL_DES_H |
| #define AVUTIL_DES_H |
| |
| #include <stdint.h> |
| |
| struct AVDES { |
| uint64_t round_keys[3][16]; |
| int triple_des; |
| }; |
| |
| /** |
| * \brief Initializes an AVDES context. |
| * |
| * \param key_bits must be 64 or 192 |
| * \param decrypt 0 for encryption, 1 for decryption |
| */ |
| int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt); |
| |
| /** |
| * \brief Encrypts / decrypts using the DES algorithm. |
| * |
| * \param count number of 8 byte blocks |
| * \param dst destination array, can be equal to src, must be 8-byte aligned |
| * \param src source array, can be equal to dst, must be 8-byte aligned, may be NULL |
| * \param iv initialization vector for CBC mode, if NULL then ECB will be used, |
| * must be 8-byte aligned |
| * \param decrypt 0 for encryption, 1 for decryption |
| */ |
| void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt); |
| |
| #endif /* AVUTIL_DES_H */ |