4 * This file is part of Libav.
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVUTIL_BLOWFISH_H
22 #define AVUTIL_BLOWFISH_H
28 * @defgroup lavu_blowfish Blowfish
29 * @ingroup lavu_crypto
33 #if FF_API_CRYPTO_CONTEXT
34 #define AV_BF_ROUNDS 16
36 typedef struct AVBlowfish {
37 uint32_t p[AV_BF_ROUNDS + 2];
41 typedef struct AVBlowfish AVBlowfish;
45 * Allocate an AVBlowfish context.
47 AVBlowfish *av_blowfish_alloc(void);
50 * Initialize an AVBlowfish context.
52 * @param ctx an AVBlowfish context
54 * @param key_len length of the key
56 void av_blowfish_init(struct AVBlowfish *ctx, const uint8_t *key, int key_len);
59 * Encrypt or decrypt a buffer using a previously initialized context.
61 * @param ctx an AVBlowfish context
62 * @param xl left four bytes halves of input to be encrypted
63 * @param xr right four bytes halves of input to be encrypted
64 * @param decrypt 0 for encryption, 1 for decryption
66 void av_blowfish_crypt_ecb(struct AVBlowfish *ctx, uint32_t *xl, uint32_t *xr,
70 * Encrypt or decrypt a buffer using a previously initialized context.
72 * @param ctx an AVBlowfish context
73 * @param dst destination array, can be equal to src
74 * @param src source array, can be equal to dst
75 * @param count number of 8 byte blocks
76 * @param iv initialization vector for CBC mode, if NULL ECB will be used
77 * @param decrypt 0 for encryption, 1 for decryption
79 void av_blowfish_crypt(struct AVBlowfish *ctx, uint8_t *dst, const uint8_t *src,
80 int count, uint8_t *iv, int decrypt);
86 #endif /* AVUTIL_BLOWFISH_H */