| /* | |
| * 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 | |
| */ | |
| /** | |
| * @defgroup lavu_des DES | |
| * @ingroup lavu_crypto | |
| * @{ | |
| */ | |
| typedef struct AVDES { | |
| uint64_t round_keys[3][16]; | |
| int triple_des; | |
| } AVDES; | |
| /** | |
| * Allocate an AVDES context. | |
| */ | |
| AVDES *av_des_alloc(void); | |
| /** | |
| * @brief Initializes an AVDES context. | |
| * | |
| * @param d pointer to a AVDES structure to initialize | |
| * @param key pointer to the key to use | |
| * @param key_bits must be 64 or 192 | |
| * @param decrypt 0 for encryption/CBC-MAC, 1 for decryption | |
| * @return zero on success, negative value otherwise | |
| */ | |
| int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt); | |
| /** | |
| * @brief Encrypts / decrypts using the DES algorithm. | |
| * | |
| * @param d pointer to the AVDES structure | |
| * @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 count number of 8 byte blocks | |
| * @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); | |
| /** | |
| * @brief Calculates CBC-MAC using the DES algorithm. | |
| * | |
| * @param d pointer to the AVDES structure | |
| * @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 count number of 8 byte blocks | |
| */ | |
| void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count); | |
| /** | |
| * @} | |
| */ | |