1 /* 2 * RC4 encryption/decryption/pseudo-random number generator 3 * 4 * This file is part of FFmpeg. 5 * 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. 10 * 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. 15 * 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 19 */ 20 module ffmpeg.libavutil.rc4; 21 extern (C) @nogc nothrow: 22 23 /** 24 * @defgroup lavu_rc4 RC4 25 * @ingroup lavu_crypto 26 * @{ 27 */ 28 29 struct AVRC4 30 { 31 ubyte[256] state; 32 int x; 33 int y; 34 } 35 36 /** 37 * Allocate an AVRC4 context. 38 */ 39 AVRC4* av_rc4_alloc (); 40 41 /** 42 * @brief Initializes an AVRC4 context. 43 * 44 * @param key_bits must be a multiple of 8 45 * @param decrypt 0 for encryption, 1 for decryption, currently has no effect 46 * @return zero on success, negative value otherwise 47 */ 48 int av_rc4_init (AVRC4* d, const(ubyte)* key, int key_bits, int decrypt); 49 50 /** 51 * @brief Encrypts / decrypts using the RC4 algorithm. 52 * 53 * @param count number of bytes 54 * @param dst destination array, can be equal to src 55 * @param src source array, can be equal to dst, may be NULL 56 * @param iv not (yet) used for RC4, should be NULL 57 * @param decrypt 0 for encryption, 1 for decryption, not (yet) used 58 */ 59 void av_rc4_crypt (AVRC4* d, ubyte* dst, const(ubyte)* src, int count, ubyte* iv, int decrypt); 60 61 /** 62 * @} 63 */ 64 65 /* AVUTIL_RC4_H */