blowfish.h (2313B)
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 */