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>
83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/*
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* Blowfish algorithm
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* Copyright (c) 2012 Samuel Pitoiset
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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_BLOWFISH_H
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#define AVUTIL_BLOWFISH_H
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#include <stdint.h>
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/**
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* @defgroup lavu_blowfish Blowfish
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* @ingroup lavu_crypto
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* @{
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*/
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#define AV_BF_ROUNDS 16
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typedef struct AVBlowfish {
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uint32_t p[AV_BF_ROUNDS + 2];
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uint32_t s[4][256];
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} AVBlowfish;
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/**
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* Allocate an AVBlowfish context.
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*/
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AVBlowfish *av_blowfish_alloc(void);
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/**
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* Initialize an AVBlowfish context.
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*
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* @param ctx an AVBlowfish context
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* @param key a key
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* @param key_len length of the key
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*/
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void av_blowfish_init(struct AVBlowfish *ctx, const uint8_t *key, int key_len);
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/**
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* Encrypt or decrypt a buffer using a previously initialized context.
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*
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* @param ctx an AVBlowfish context
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* @param xl left four bytes halves of input to be encrypted
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* @param xr right four bytes halves of input to be encrypted
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* @param decrypt 0 for encryption, 1 for decryption
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*/
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void av_blowfish_crypt_ecb(struct AVBlowfish *ctx, uint32_t *xl, uint32_t *xr,
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int decrypt);
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/**
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* Encrypt or decrypt a buffer using a previously initialized context.
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*
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* @param ctx an AVBlowfish context
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* @param dst destination array, can be equal to src
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* @param src source array, can be equal to dst
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* @param count number of 8 byte blocks
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* @param iv initialization vector for CBC mode, if NULL ECB will be used
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* @param decrypt 0 for encryption, 1 for decryption
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*/
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void av_blowfish_crypt(struct AVBlowfish *ctx, uint8_t *dst, const uint8_t *src,
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int count, uint8_t *iv, int decrypt);
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/**
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* @}
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*/
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#endif /* AVUTIL_BLOWFISH_H */
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