FFmpeg
cast5.h
Go to the documentation of this file.
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 
36 extern const int av_cast5_size;
37 
38 struct AVCAST5;
39 
40 /**
41  * Allocate an AVCAST5 context
42  * To free the struct: av_free(ptr)
43  */
44 struct 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  */
53 int 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  */
64 void 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  */
76 void 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 */
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.
Definition: cast5.c:496
const char * key
#define src
Definition: vp8dsp.c:254
int av_cast5_init(struct AVCAST5 *ctx, const uint8_t *key, int key_bits)
Initialize an AVCAST5 context.
Definition: cast5.c:456
uint8_t
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.
Definition: cast5.c:476
GLsizei count
Definition: opengl_enc.c:108
AVFormatContext * ctx
Definition: movenc.c:48
Definition: cast5.c:71
struct AVCAST5 * av_cast5_alloc(void)
Allocate an AVCAST5 context To free the struct: av_free(ptr)
Definition: cast5.c:451
const int av_cast5_size
Definition: cast5.c:77