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/*
* DES encryption/decryption
* Copyright (c) 2007 Reimar Doeffinger
*
* 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
*/
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#ifndef AVUTIL_DES_H
#define AVUTIL_DES_H |
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#include <stdint.h> |
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/**
* @defgroup lavu_des DES
* @ingroup lavu_crypto
* @{
*/
typedef struct AVDES { |
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uint64_t round_keys[3][16];
int triple_des; |
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} AVDES;
/**
* Allocate an AVDES context.
*/
AVDES *av_des_alloc(void); |
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/** |
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* @brief Initializes an AVDES context. |
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* |
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* @param key_bits must be 64 or 192 |
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* @param decrypt 0 for encryption/CBC-MAC, 1 for decryption |
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* @return zero on success, negative value otherwise |
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*/
int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt); |
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/** |
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* @brief Encrypts / decrypts using the DES algorithm. |
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* |
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* @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, |
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* must be 8-byte aligned |
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* @param decrypt 0 for encryption, 1 for decryption |
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*/ |
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void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt); |
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/**
* @brief Calculates CBC-MAC 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
*/
void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count);
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/**
* @}
*/
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#endif /* AVUTIL_DES_H */ |