+
−/*
+
− * Blowfish algorithm
+
− *
+
− * This file is part of Libav.
+
− *
+
− * Libav 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.
+
− *
+
− * Libav 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 Libav; 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;
+
−
+
−/**
+
− * 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 */