repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * Blowfish algorithm | |
| 3 | * Copyright (c) 2012 Samuel Pitoiset | |
| 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_BLOWFISH_H | |
| 23 | #define AVUTIL_BLOWFISH_H | |
| 24 | ||
| 25 | #include <stdint.h> | |
| 26 | ||
| 27 | /** | |
| 28 | * @defgroup lavu_blowfish Blowfish | |
| 29 | * @ingroup lavu_crypto | |
| 30 | * @{ | |
| 31 | */ | |
| 32 | ||
| 33 | #define AV_BF_ROUNDS 16 | |
| 34 | ||
| 35 | typedef struct AVBlowfish { | |
| 36 | uint32_t p[AV_BF_ROUNDS + 2]; | |
| 37 | uint32_t s[4][256]; | |
| 38 | } AVBlowfish; | |
| 39 | ||
| 40 | /** | |
| 41 | * Initialize an AVBlowfish context. | |
| 42 | * | |
| 43 | * @param ctx an AVBlowfish context | |
| 44 | * @param key a key | |
| 45 | * @param key_len length of the key | |
| 46 | */ | |
| 47 | void av_blowfish_init(struct AVBlowfish *ctx, const uint8_t *key, int key_len); | |
| 48 | ||
| 49 | /** | |
| 50 | * Encrypt or decrypt a buffer using a previously initialized context. | |
| 51 | * | |
| 52 | * @param ctx an AVBlowfish context | |
| 53 | * @param xl left four bytes halves of input to be encrypted | |
| 54 | * @param xr right four bytes halves of input to be encrypted | |
| 55 | * @param decrypt 0 for encryption, 1 for decryption | |
| 56 | */ | |
| 57 | void av_blowfish_crypt_ecb(struct AVBlowfish *ctx, uint32_t *xl, uint32_t *xr, | |
| 58 | int decrypt); | |
| 59 | ||
| 60 | /** | |
| 61 | * Encrypt or decrypt a buffer using a previously initialized context. | |
| 62 | * | |
| 63 | * @param ctx an AVBlowfish context | |
| 64 | * @param dst destination array, can be equal to src | |
| 65 | * @param src source array, can be equal to dst | |
| 66 | * @param count number of 8 byte blocks | |
| 67 | * @param iv initialization vector for CBC mode, if NULL ECB will be used | |
| 68 | * @param decrypt 0 for encryption, 1 for decryption | |
| 69 | */ | |
| 70 | void av_blowfish_crypt(struct AVBlowfish *ctx, uint8_t *dst, const uint8_t *src, | |
| 71 | int count, uint8_t *iv, int decrypt); | |
| 72 | ||
| 73 | /** | |
| 74 | * @} | |
| 75 | */ | |
| 76 | ||
| 77 | #endif /* AVUTIL_BLOWFISH_H */ |