2 * An implementation of the CAST128 algorithm as mentioned in RFC2144
3 * Copyright (c) 2014 Supraja Meedinti
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_CAST5_H
23 #define AVUTIL_CAST5_H
30 * @brief Public header for libavutil CAST5 algorithm
31 * @defgroup lavu_cast5 CAST5
32 * @ingroup lavu_crypto
36 extern const int av_cast5_size;
41 * Allocate an AVCAST5 context
42 * To free the struct: av_free(ptr)
44 struct AVCAST5 *av_cast5_alloc(void);
46 * Initialize an AVCAST5 context.
48 * @param ctx an AVCAST5 context
49 * @param key a key of 5,6,...16 bytes used for encryption/decryption
50 * @param key_bits number of keybits: possible are 40,48,...,128
52 int av_cast5_init(struct AVCAST5 *ctx, const uint8_t *key, int key_bits);
55 * Encrypt or decrypt a buffer using a previously initialized context, ECB mode only
57 * @param ctx an AVCAST5 context
58 * @param dst destination array, can be equal to src
59 * @param src source array, can be equal to dst
60 * @param count number of 8 byte blocks
61 * @param decrypt 0 for encryption, 1 for decryption
63 void av_cast5_crypt(struct AVCAST5 *ctx, uint8_t *dst, const uint8_t *src, int count, int decrypt);
66 * Encrypt or decrypt a buffer using a previously initialized context
68 * @param ctx an AVCAST5 context
69 * @param dst destination array, can be equal to src
70 * @param src source array, can be equal to dst
71 * @param count number of 8 byte blocks
72 * @param iv initialization vector for CBC mode, NULL for ECB mode
73 * @param decrypt 0 for encryption, 1 for decryption
75 void av_cast5_crypt2(struct AVCAST5 *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
79 #endif /* AVUTIL_CAST5_H */