New file |
| | |
| | | /* |
| | | * 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> |
| | | |
| | | /** |
| | | * @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 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 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); |
| | | |
| | | /** |
| | | * @brief Calculates CBC-MAC 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 |
| | | */ |
| | | void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count); |
| | | |
| | | /** |
| | | * @} |
| | | */ |
| | | |
| | | #endif /* AVUTIL_DES_H */ |