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comparison lib/libavutil/blowfish.h @ 2134:992d2e6f907d

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preparation for libavcodec
author zipi
date Tue, 31 Dec 2013 14:52:14 +0000
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2133:e378232bfd36 2134:992d2e6f907d
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
27 /**
28 * @defgroup lavu_blowfish Blowfish
29 * @ingroup lavu_crypto
30 * @{
31 */
32
33 #define AV_BF_ROUNDS 16
34
35 typedef struct AVBlowfish {
36 uint32_t p[AV_BF_ROUNDS + 2];
37 uint32_t s[4][256];
38 } AVBlowfish;
39
40 /**
41 * Initialize an AVBlowfish context.
42 *
43 * @param ctx an AVBlowfish context
44 * @param key a key
45 * @param key_len length of the key
46 */
47 void av_blowfish_init(struct AVBlowfish *ctx, const uint8_t *key, int key_len);
48
49 /**
50 * Encrypt or decrypt a buffer using a previously initialized context.
51 *
52 * @param ctx an AVBlowfish context
53 * @param xl left four bytes halves of input to be encrypted
54 * @param xr right four bytes halves of input to be encrypted
55 * @param decrypt 0 for encryption, 1 for decryption
56 */
57 void av_blowfish_crypt_ecb(struct AVBlowfish *ctx, uint32_t *xl, uint32_t *xr,
58 int decrypt);
59
60 /**
61 * Encrypt or decrypt a buffer using a previously initialized context.
62 *
63 * @param ctx an AVBlowfish context
64 * @param dst destination array, can be equal to src
65 * @param src source array, can be equal to dst
66 * @param count number of 8 byte blocks
67 * @param iv initialization vector for CBC mode, if NULL ECB will be used
68 * @param decrypt 0 for encryption, 1 for decryption
69 */
70 void av_blowfish_crypt(struct AVBlowfish *ctx, uint8_t *dst, const uint8_t *src,
71 int count, uint8_t *iv, int decrypt);
72
73 /**
74 * @}
75 */
76
77 #endif /* AVUTIL_BLOWFISH_H */