FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
blowfish.h
Go to the documentation of this file.
1 /*
2  * Blowfish algorithm
3  * Copyright (c) 2012 Samuel Pitoiset
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_BLOWFISH_H
23 #define AVUTIL_BLOWFISH_H
24 
25 #include <stdint.h>
26 #include "version.h"
27 
28 /**
29  * @defgroup lavu_blowfish Blowfish
30  * @ingroup lavu_crypto
31  * @{
32  */
33 
34 #if FF_API_CRYPTO_CONTEXT
35 #define AV_BF_ROUNDS 16
36 
37 typedef struct AVBlowfish {
38  uint32_t p[AV_BF_ROUNDS + 2];
39  uint32_t s[4][256];
40 } AVBlowfish;
41 #else
42 typedef struct AVBlowfish AVBlowfish;
43 #endif
44 
45 /**
46  * Allocate an AVBlowfish context.
47  */
49 
50 /**
51  * Initialize an AVBlowfish context.
52  *
53  * @param ctx an AVBlowfish context
54  * @param key a key
55  * @param key_len length of the key
56  */
57 void av_blowfish_init(struct AVBlowfish *ctx, const uint8_t *key, int key_len);
58 
59 /**
60  * Encrypt or decrypt a buffer using a previously initialized context.
61  *
62  * @param ctx an AVBlowfish context
63  * @param xl left four bytes halves of input to be encrypted
64  * @param xr right four bytes halves of input to be encrypted
65  * @param decrypt 0 for encryption, 1 for decryption
66  */
67 void av_blowfish_crypt_ecb(struct AVBlowfish *ctx, uint32_t *xl, uint32_t *xr,
68  int decrypt);
69 
70 /**
71  * Encrypt or decrypt a buffer using a previously initialized context.
72  *
73  * @param ctx an AVBlowfish context
74  * @param dst destination array, can be equal to src
75  * @param src source array, can be equal to dst
76  * @param count number of 8 byte blocks
77  * @param iv initialization vector for CBC mode, if NULL ECB will be used
78  * @param decrypt 0 for encryption, 1 for decryption
79  */
80 void av_blowfish_crypt(struct AVBlowfish *ctx, uint8_t *dst, const uint8_t *src,
81  int count, uint8_t *iv, int decrypt);
82 
83 /**
84  * @}
85  */
86 
87 #endif /* AVUTIL_BLOWFISH_H */
uint32_t p[AV_BF_ROUNDS+2]
Definition: blowfish.h:38
AVBlowfish * av_blowfish_alloc(void)
Allocate an AVBlowfish context.
Definition: blowfish.c:313
void av_blowfish_crypt(struct AVBlowfish *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: blowfish.c:384
uint8_t
void av_blowfish_init(struct AVBlowfish *ctx, const uint8_t *key, int key_len)
Initialize an AVBlowfish context.
Definition: blowfish.c:318
Libavutil version macros.
GLsizei count
Definition: opengl_enc.c:109
void av_blowfish_crypt_ecb(struct AVBlowfish *ctx, uint32_t *xl, uint32_t *xr, int decrypt)
Encrypt or decrypt a buffer using a previously initialized context.
Definition: blowfish.c:353
uint32_t s[4][256]
Definition: blowfish.h:39
AVS_Value src
Definition: avisynth_c.h:482
#define AV_BF_ROUNDS
Definition: blowfish.h:35