/*

 * 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 */