3 * Copyright (c) 2012 Samuel Pitoiset
5 * This file is part of FFmpeg.
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.
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.
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
22 #ifndef AVUTIL_BLOWFISH_H
23 #define AVUTIL_BLOWFISH_H
29 * @defgroup lavu_blowfish Blowfish
30 * @ingroup lavu_crypto
34 #if FF_API_CRYPTO_CONTEXT
35 #define AV_BF_ROUNDS 16
37 typedef struct AVBlowfish {
38 uint32_t p[AV_BF_ROUNDS + 2];
42 typedef struct AVBlowfish AVBlowfish;
46 * Allocate an AVBlowfish context.
48 AVBlowfish *av_blowfish_alloc(void);
51 * Initialize an AVBlowfish context.
53 * @param ctx an AVBlowfish context
55 * @param key_len length of the key
57 void av_blowfish_init(struct AVBlowfish *ctx, const uint8_t *key, int key_len);
60 * Encrypt or decrypt a buffer using a previously initialized context.
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
67 void av_blowfish_crypt_ecb(struct AVBlowfish *ctx, uint32_t *xl, uint32_t *xr,
71 * Encrypt or decrypt a buffer using a previously initialized context.
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
80 void av_blowfish_crypt(struct AVBlowfish *ctx, uint8_t *dst, const uint8_t *src,
81 int count, uint8_t *iv, int decrypt);
87 #endif /* AVUTIL_BLOWFISH_H */