/* * 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 */