FFmpeg 7.1.1
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rc4.h
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1/*
2 * RC4 encryption/decryption/pseudo-random number generator
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#ifndef AVUTIL_RC4_H
22#define AVUTIL_RC4_H
23
24#include <stdint.h>
25
26/**
27 * @defgroup lavu_rc4 RC4
28 * @ingroup lavu_crypto
29 * @{
30 */
31
32typedef struct AVRC4 {
33 uint8_t state[256];
34 int x, y;
35} AVRC4;
36
37/**
38 * Allocate an AVRC4 context.
39 */
41
42/**
43 * @brief Initializes an AVRC4 context.
44 *
45 * @param d pointer to the AVRC4 context
46 * @param key buffer containig the key
47 * @param key_bits must be a multiple of 8
48 * @param decrypt 0 for encryption, 1 for decryption, currently has no effect
49 * @return zero on success, negative value otherwise
50 */
51int av_rc4_init(struct AVRC4 *d, const uint8_t *key, int key_bits, int decrypt);
52
53/**
54 * @brief Encrypts / decrypts using the RC4 algorithm.
55 *
56 * @param d pointer to the AVRC4 context
57 * @param count number of bytes
58 * @param dst destination array, can be equal to src
59 * @param src source array, can be equal to dst, may be NULL
60 * @param iv not (yet) used for RC4, should be NULL
61 * @param decrypt 0 for encryption, 1 for decryption, not (yet) used
62 */
63void av_rc4_crypt(struct AVRC4 *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
64
65/**
66 * @}
67 */
68
69#endif /* AVUTIL_RC4_H */
int av_rc4_init(struct AVRC4 *d, const uint8_t *key, int key_bits, int decrypt)
Initializes an AVRC4 context.
AVRC4 * av_rc4_alloc(void)
Allocate an AVRC4 context.
void av_rc4_crypt(struct AVRC4 *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
Encrypts / decrypts using the RC4 algorithm.
Definition rc4.h:32
uint8_t state[256]
Definition rc4.h:33
int y
Definition rc4.h:34
int x
Definition rc4.h:34