3d1690b8c6
It's been argued that the benefits of the current implementation far outweight those of making the structs opaque. This deprecation is not present in any release, so it can be safely removed. Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/*
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* DES encryption/decryption
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* Copyright (c) 2007 Reimar Doeffinger
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_DES_H
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#define AVUTIL_DES_H
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#include <stdint.h>
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/**
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* @defgroup lavu_des DES
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* @ingroup lavu_crypto
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* @{
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*/
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typedef struct AVDES {
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uint64_t round_keys[3][16];
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int triple_des;
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} AVDES;
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/**
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* Allocate an AVDES context.
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*/
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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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*/
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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
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* @param dst destination array, can be equal to src, must be 8-byte aligned
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* @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL
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* @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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/**
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* @brief Calculates CBC-MAC using the DES algorithm.
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*
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* @param count number of 8 byte blocks
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* @param dst destination array, can be equal to src, must be 8-byte aligned
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* @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL
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*/
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void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count);
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/**
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* @}
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*/
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#endif /* AVUTIL_DES_H */
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