FFmpeg 7.1.1
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des.h
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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/**
28 * @defgroup lavu_des DES
29 * @ingroup lavu_crypto
30 * @{
31 */
32
33typedef struct AVDES {
34 uint64_t round_keys[3][16];
36} AVDES;
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 */
52int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt);
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 */
65void 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 */
75void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count);
76
77/**
78 * @}
79 */
80
81#endif /* AVUTIL_DES_H */
void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count)
Calculates CBC-MAC using the DES algorithm.
AVDES * av_des_alloc(void)
Allocate an AVDES context.
int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt)
Initializes an AVDES context.
void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
Encrypts / decrypts using the DES algorithm.
Definition des.h:33
int triple_des
Definition des.h:35
uint64_t round_keys[3][16]
Definition des.h:34