PeerStreamer

/*

 * DES encryption/decryption

 * Copyright (c) 2007 Reimar Doeffinger

 *

 * 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_DES_H

#define AVUTIL_DES_H

#include <stdint.h>

struct AVDES {

    uint64_t round_keys[3][16];

    int triple_des;

};

/**

 * \brief Initializes an AVDES context.

 *

 * \param key_bits must be 64 or 192

 * \param decrypt 0 for encryption, 1 for decryption

 */

int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt);

/**

 * \brief Encrypts / decrypts using the DES algorithm.

 *

 * \param count number of 8 byte blocks

 * \param dst destination array, can be equal to src, must be 8-byte aligned

 * \param src source array, can be equal to dst, must be 8-byte aligned, may be NULL

 * \param iv initialization vector for CBC mode, if NULL then ECB will be used,

 *           must be 8-byte aligned

 * \param decrypt 0 for encryption, 1 for decryption

 */

void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);

#endif /* AVUTIL_DES_H */