2 * RC4 encryption/decryption/pseudo-random number generator
4 * This file is part of FFmpeg.
6 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 * @defgroup lavu_rc4 RC4
29 * @ingroup lavu_crypto
33 #if FF_API_CRYPTO_CONTEXT
34 typedef struct AVRC4 {
39 typedef struct AVRC4 AVRC4;
43 * Allocate an AVRC4 context.
45 AVRC4 *av_rc4_alloc(void);
48 * @brief Initializes an AVRC4 context.
50 * @param key_bits must be a multiple of 8
51 * @param decrypt 0 for encryption, 1 for decryption, currently has no effect
52 * @return zero on success, negative value otherwise
54 int av_rc4_init(struct AVRC4 *d, const uint8_t *key, int key_bits, int decrypt);
57 * @brief Encrypts / decrypts using the RC4 algorithm.
59 * @param count number of bytes
60 * @param dst destination array, can be equal to src
61 * @param src source array, can be equal to dst, may be NULL
62 * @param iv not (yet) used for RC4, should be NULL
63 * @param decrypt 0 for encryption, 1 for decryption, not (yet) used
65 void av_rc4_crypt(struct AVRC4 *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
71 #endif /* AVUTIL_RC4_H */