blob: 4cf11f5bca47a18544e172bc1d4457a3ff7a1720
| 1 | /* |
| 2 | * DES encryption/decryption |
| 3 | * Copyright (c) 2007 Reimar Doeffinger |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #ifndef AVUTIL_DES_H |
| 23 | #define AVUTIL_DES_H |
| 24 | |
| 25 | #include <stdint.h> |
| 26 | |
| 27 | /** |
| 28 | * @defgroup lavu_des DES |
| 29 | * @ingroup lavu_crypto |
| 30 | * @{ |
| 31 | */ |
| 32 | |
| 33 | typedef struct AVDES { |
| 34 | uint64_t round_keys[3][16]; |
| 35 | int triple_des; |
| 36 | } AVDES; |
| 37 | |
| 38 | /** |
| 39 | * Allocate an AVDES context. |
| 40 | */ |
| 41 | AVDES *av_des_alloc(void); |
| 42 | |
| 43 | /** |
| 44 | * @brief Initializes an AVDES context. |
| 45 | * |
| 46 | * @param key_bits must be 64 or 192 |
| 47 | * @param decrypt 0 for encryption/CBC-MAC, 1 for decryption |
| 48 | * @return zero on success, negative value otherwise |
| 49 | */ |
| 50 | int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt); |
| 51 | |
| 52 | /** |
| 53 | * @brief Encrypts / decrypts using the DES algorithm. |
| 54 | * |
| 55 | * @param count number of 8 byte blocks |
| 56 | * @param dst destination array, can be equal to src, must be 8-byte aligned |
| 57 | * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL |
| 58 | * @param iv initialization vector for CBC mode, if NULL then ECB will be used, |
| 59 | * must be 8-byte aligned |
| 60 | * @param decrypt 0 for encryption, 1 for decryption |
| 61 | */ |
| 62 | void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt); |
| 63 | |
| 64 | /** |
| 65 | * @brief Calculates CBC-MAC using the DES algorithm. |
| 66 | * |
| 67 | * @param count number of 8 byte blocks |
| 68 | * @param dst destination array, can be equal to src, must be 8-byte aligned |
| 69 | * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL |
| 70 | */ |
| 71 | void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count); |
| 72 | |
| 73 | /** |
| 74 | * @} |
| 75 | */ |
| 76 | |
| 77 | #endif /* AVUTIL_DES_H */ |
| 78 |