| /* | |
| * An implementation of the TwoFish algorithm | |
| * Copyright (c) 2015 Supraja Meedinti | |
| * | |
| * This file is part of FFmpeg. | |
| * | |
| * FFmpeg is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Lesser General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2.1 of the License, or (at your option) any later version. | |
| * | |
| * FFmpeg is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| * Lesser General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU Lesser General Public | |
| * License along with FFmpeg; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| /** | |
| * @file | |
| * @brief Public header for libavutil TWOFISH algorithm | |
| * @defgroup lavu_twofish TWOFISH | |
| * @ingroup lavu_crypto | |
| * @{ | |
| */ | |
| extern const int av_twofish_size; | |
| struct AVTWOFISH; | |
| /** | |
| * Allocate an AVTWOFISH context | |
| * To free the struct: av_free(ptr) | |
| */ | |
| struct AVTWOFISH *av_twofish_alloc(void); | |
| /** | |
| * Initialize an AVTWOFISH context. | |
| * | |
| * @param ctx an AVTWOFISH context | |
| * @param key a key of size ranging from 1 to 32 bytes used for encryption/decryption | |
| * @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 | |
| */ | |
| int av_twofish_init(struct AVTWOFISH *ctx, const uint8_t *key, int key_bits); | |
| /** | |
| * Encrypt or decrypt a buffer using a previously initialized context | |
| * | |
| * @param ctx an AVTWOFISH context | |
| * @param dst destination array, can be equal to src | |
| * @param src source array, can be equal to dst | |
| * @param count number of 16 byte blocks | |
| * @param iv initialization vector for CBC mode, NULL for ECB mode | |
| * @param decrypt 0 for encryption, 1 for decryption | |
| */ | |
| void av_twofish_crypt(struct AVTWOFISH *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t* iv, int decrypt); | |
| /** | |
| * @} | |
| */ | |