FFmpeg
twofish.h
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1 /*
2  * An implementation of the TwoFish algorithm
3  * Copyright (c) 2015 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_TWOFISH_H
23 #define AVUTIL_TWOFISH_H
24 
25 #include <stdint.h>
26 
27 
28 /**
29  * @file
30  * @brief Public header for libavutil TWOFISH algorithm
31  * @defgroup lavu_twofish TWOFISH
32  * @ingroup lavu_crypto
33  * @{
34  */
35 
36 extern const int av_twofish_size;
37 
38 struct AVTWOFISH;
39 
40 /**
41  * Allocate an AVTWOFISH context
42  * To free the struct: av_free(ptr)
43  */
44 struct AVTWOFISH *av_twofish_alloc(void);
45 
46 /**
47  * Initialize an AVTWOFISH context.
48  *
49  * @param ctx an AVTWOFISH context
50  * @param key a key of size ranging from 1 to 32 bytes used for encryption/decryption
51  * @param key_bits number of keybits: 128, 192, 256 If less than the required, padded with zeroes to nearest valid value; return value is 0 if key_bits is 128/192/256, -1 if less than 0, 1 otherwise
52  */
53 int av_twofish_init(struct AVTWOFISH *ctx, const uint8_t *key, int key_bits);
54 
55 /**
56  * Encrypt or decrypt a buffer using a previously initialized context
57  *
58  * @param ctx an AVTWOFISH 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 16 byte blocks
62  * @paran iv initialization vector for CBC mode, NULL for ECB mode
63  * @param decrypt 0 for encryption, 1 for decryption
64  */
65 void av_twofish_crypt(struct AVTWOFISH *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t* iv, int decrypt);
66 
67 /**
68  * @}
69  */
70 #endif /* AVUTIL_TWOFISH_H */
const char * key
#define src
Definition: vp8dsp.c:254
uint8_t
GLsizei count
Definition: opengl_enc.c:108
const int av_twofish_size
Definition: twofish.c:120
struct AVTWOFISH * av_twofish_alloc(void)
Allocate an AVTWOFISH context To free the struct: av_free(ptr)
Definition: twofish.c:115
void av_twofish_crypt(struct AVTWOFISH *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: twofish.c:312
AVFormatContext * ctx
Definition: movenc.c:48
int av_twofish_init(struct AVTWOFISH *ctx, const uint8_t *key, int key_bits)
Initialize an AVTWOFISH context.
Definition: twofish.c:269