twofish.h (2245B)
1 /* 2 * An implementation of the TwoFish algorithm 3 * Copyright (c) 2015 Supraja Meedinti 4 * 5 * This file is part of FFmpeg. 6 * 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. 11 * 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. 16 * 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 20 */ 21 22 #ifndef AVUTIL_TWOFISH_H 23 #define AVUTIL_TWOFISH_H 24 25 #include <stdint.h> 26 27 28 /** 29 * @file 30 * @brief Public header for libavutil TWOFISH algorithm 31 * @defgroup lavu_twofish TWOFISH 32 * @ingroup lavu_crypto 33 * @{ 34 */ 35 36 extern const int av_twofish_size; 37 38 struct AVTWOFISH; 39 40 /** 41 * Allocate an AVTWOFISH context 42 * To free the struct: av_free(ptr) 43 */ 44 struct AVTWOFISH *av_twofish_alloc(void); 45 46 /** 47 * Initialize an AVTWOFISH context. 48 * 49 * @param ctx an AVTWOFISH context 50 * @param key a key of size ranging from 1 to 32 bytes used for encryption/decryption 51 * @param key_bits number of keybits: 128, 192, 256 If less than the required, padded with zeroes to nearest valid value; return value is 0 if key_bits is 128/192/256, -1 if less than 0, 1 otherwise 52 */ 53 int av_twofish_init(struct AVTWOFISH *ctx, const uint8_t *key, int key_bits); 54 55 /** 56 * Encrypt or decrypt a buffer using a previously initialized context 57 * 58 * @param ctx an AVTWOFISH context 59 * @param dst destination array, can be equal to src 60 * @param src source array, can be equal to dst 61 * @param count number of 16 byte blocks 62 * @param iv initialization vector for CBC mode, NULL for ECB mode 63 * @param decrypt 0 for encryption, 1 for decryption 64 */ 65 void av_twofish_crypt(struct AVTWOFISH *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t* iv, int decrypt); 66 67 /** 68 * @} 69 */ 70 #endif /* AVUTIL_TWOFISH_H */