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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 | struct AVDES { | |
28 | uint64_t round_keys[3][16]; | |
29 | int triple_des; | |
30 | }; | |
31 | ||
32 | /** | |
33 | * @brief Initializes an AVDES context. | |
34 | * | |
35 | * @param key_bits must be 64 or 192 | |
36 | * @param decrypt 0 for encryption/CBC-MAC, 1 for decryption | |
37 | */ | |
38 | int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt); | |
39 | ||
40 | /** | |
41 | * @brief Encrypts / decrypts using the DES algorithm. | |
42 | * | |
43 | * @param count number of 8 byte blocks | |
44 | * @param dst destination array, can be equal to src, must be 8-byte aligned | |
45 | * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL | |
46 | * @param iv initialization vector for CBC mode, if NULL then ECB will be used, | |
47 | * must be 8-byte aligned | |
48 | * @param decrypt 0 for encryption, 1 for decryption | |
49 | */ | |
50 | void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt); | |
51 | ||
52 | /** | |
53 | * @brief Calculates CBC-MAC 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 | */ | |
59 | void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count); | |
60 | ||
61 | #endif /* AVUTIL_DES_H */ |