FFmpeg 5.1.4
cast5.h
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1/*
2 * An implementation of the CAST128 algorithm as mentioned in RFC2144
3 * Copyright (c) 2014 Supraja Meedinti
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_CAST5_H
23#define AVUTIL_CAST5_H
24
25#include <stdint.h>
26
27
28/**
29 * @file
30 * @brief Public header for libavutil CAST5 algorithm
31 * @defgroup lavu_cast5 CAST5
32 * @ingroup lavu_crypto
33 * @{
34 */
35
36extern const int av_cast5_size;
37
38struct AVCAST5;
39
40/**
41 * Allocate an AVCAST5 context
42 * To free the struct: av_free(ptr)
43 */
44struct AVCAST5 *av_cast5_alloc(void);
45/**
46 * Initialize an AVCAST5 context.
47 *
48 * @param ctx an AVCAST5 context
49 * @param key a key of 5,6,...16 bytes used for encryption/decryption
50 * @param key_bits number of keybits: possible are 40,48,...,128
51 * @return 0 on success, less than 0 on failure
52 */
53int av_cast5_init(struct AVCAST5 *ctx, const uint8_t *key, int key_bits);
54
55/**
56 * Encrypt or decrypt a buffer using a previously initialized context, ECB mode only
57 *
58 * @param ctx an AVCAST5 context
59 * @param dst destination array, can be equal to src
60 * @param src source array, can be equal to dst
61 * @param count number of 8 byte blocks
62 * @param decrypt 0 for encryption, 1 for decryption
63 */
64void av_cast5_crypt(struct AVCAST5 *ctx, uint8_t *dst, const uint8_t *src, int count, int decrypt);
65
66/**
67 * Encrypt or decrypt a buffer using a previously initialized context
68 *
69 * @param ctx an AVCAST5 context
70 * @param dst destination array, can be equal to src
71 * @param src source array, can be equal to dst
72 * @param count number of 8 byte blocks
73 * @param iv initialization vector for CBC mode, NULL for ECB mode
74 * @param decrypt 0 for encryption, 1 for decryption
75 */
76void av_cast5_crypt2(struct AVCAST5 *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
77/**
78 * @}
79 */
80#endif /* AVUTIL_CAST5_H */
const int av_cast5_size
void av_cast5_crypt(struct AVCAST5 *ctx, uint8_t *dst, const uint8_t *src, int count, int decrypt)
Encrypt or decrypt a buffer using a previously initialized context, ECB mode only.
int av_cast5_init(struct AVCAST5 *ctx, const uint8_t *key, int key_bits)
Initialize an AVCAST5 context.
struct AVCAST5 * av_cast5_alloc(void)
Allocate an AVCAST5 context To free the struct: av_free(ptr)
void av_cast5_crypt2(struct AVCAST5 *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt)
Encrypt or decrypt a buffer using a previously initialized context.