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
37
38 /**
39 * Allocate an AVDES context.
40 */
42
43 /**
44 * @brief Initializes an AVDES context.
45 *
46 * @param d pointer to a AVDES structure to initialize
47 * @param key pointer to the key to use
48 * @param key_bits must be 64 or 192
49 * @param decrypt 0 for encryption/CBC-MAC, 1 for decryption
50 * @return zero on success, negative value otherwise
51 */
53
54 /**
55 * @brief Encrypts / decrypts using the DES algorithm.
56 *
57 * @param d pointer to the AVDES structure
58 * @param dst destination array, can be equal to src, must be 8-byte aligned
59 * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL
60 * @param count number of 8 byte blocks
61 * @param iv initialization vector for CBC mode, if NULL then ECB will be used,
62 * must be 8-byte aligned
63 * @param decrypt 0 for encryption, 1 for decryption
64 */
65 void av_des_crypt(
struct AVDES *
d, uint8_t *dst,
const uint8_t *
src,
int count, uint8_t *iv,
int decrypt);
66
67 /**
68 * @brief Calculates CBC-MAC using the DES algorithm.
69 *
70 * @param d pointer to the AVDES structure
71 * @param dst destination array, can be equal to src, must be 8-byte aligned
72 * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL
73 * @param count number of 8 byte blocks
74 */
76
77 /**
78 * @}
79 */
80
81 #endif /* AVUTIL_DES_H */