New file |
| | |
| | | /* |
| | | * Blowfish algorithm |
| | | * Copyright (c) 2012 Samuel Pitoiset |
| | | * |
| | | * 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 |
| | | */ |
| | | |
| | | #ifndef AVUTIL_BLOWFISH_H |
| | | #define AVUTIL_BLOWFISH_H |
| | | |
| | | #include <stdint.h> |
| | | |
| | | /** |
| | | * @defgroup lavu_blowfish Blowfish |
| | | * @ingroup lavu_crypto |
| | | * @{ |
| | | */ |
| | | |
| | | #define AV_BF_ROUNDS 16 |
| | | |
| | | typedef struct AVBlowfish { |
| | | uint32_t p[AV_BF_ROUNDS + 2]; |
| | | uint32_t s[4][256]; |
| | | } AVBlowfish; |
| | | |
| | | /** |
| | | * Allocate an AVBlowfish context. |
| | | */ |
| | | AVBlowfish *av_blowfish_alloc(void); |
| | | |
| | | /** |
| | | * Initialize an AVBlowfish context. |
| | | * |
| | | * @param ctx an AVBlowfish context |
| | | * @param key a key |
| | | * @param key_len length of the key |
| | | */ |
| | | void av_blowfish_init(struct AVBlowfish *ctx, const uint8_t *key, int key_len); |
| | | |
| | | /** |
| | | * Encrypt or decrypt a buffer using a previously initialized context. |
| | | * |
| | | * @param ctx an AVBlowfish context |
| | | * @param xl left four bytes halves of input to be encrypted |
| | | * @param xr right four bytes halves of input to be encrypted |
| | | * @param decrypt 0 for encryption, 1 for decryption |
| | | */ |
| | | void av_blowfish_crypt_ecb(struct AVBlowfish *ctx, uint32_t *xl, uint32_t *xr, |
| | | int decrypt); |
| | | |
| | | /** |
| | | * Encrypt or decrypt a buffer using a previously initialized context. |
| | | * |
| | | * @param ctx an AVBlowfish context |
| | | * @param dst destination array, can be equal to src |
| | | * @param src source array, can be equal to dst |
| | | * @param count number of 8 byte blocks |
| | | * @param iv initialization vector for CBC mode, if NULL ECB will be used |
| | | * @param decrypt 0 for encryption, 1 for decryption |
| | | */ |
| | | void av_blowfish_crypt(struct AVBlowfish *ctx, uint8_t *dst, const uint8_t *src, |
| | | int count, uint8_t *iv, int decrypt); |
| | | |
| | | /** |
| | | * @} |
| | | */ |
| | | |
| | | #endif /* AVUTIL_BLOWFISH_H */ |