2 * DES encryption/decryption
3 * Copyright (c) 2007 Reimar Doeffinger
5 * This file is part of FFmpeg.
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.
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.
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
29 * @defgroup lavu_des DES
30 * @ingroup lavu_crypto
34 #if FF_API_CRYPTO_CONTEXT
35 typedef struct AVDES {
36 uint64_t round_keys[3][16];
40 typedef struct AVDES AVDES;
44 * Allocate an AVDES context.
46 AVDES *av_des_alloc(void);
49 * @brief Initializes an AVDES context.
51 * @param key_bits must be 64 or 192
52 * @param decrypt 0 for encryption/CBC-MAC, 1 for decryption
53 * @return zero on success, negative value otherwise
55 int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt);
58 * @brief Encrypts / decrypts using the DES algorithm.
60 * @param count number of 8 byte blocks
61 * @param dst destination array, can be equal to src, must be 8-byte aligned
62 * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL
63 * @param iv initialization vector for CBC mode, if NULL then ECB will be used,
64 * must be 8-byte aligned
65 * @param decrypt 0 for encryption, 1 for decryption
67 void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
70 * @brief Calculates CBC-MAC using the DES algorithm.
72 * @param count number of 8 byte blocks
73 * @param dst destination array, can be equal to src, must be 8-byte aligned
74 * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL
76 void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count);
82 #endif /* AVUTIL_DES_H */