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70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/*
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* An implementation of the TwoFish algorithm
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* Copyright (c) 2015 Supraja Meedinti
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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_TWOFISH_H
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#define AVUTIL_TWOFISH_H
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#include <stdint.h>
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/**
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* @file
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* @brief Public header for libavutil TWOFISH algorithm
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* @defgroup lavu_twofish TWOFISH
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* @ingroup lavu_crypto
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* @{
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*/
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extern const int av_twofish_size;
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struct AVTWOFISH;
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/**
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* Allocate an AVTWOFISH context
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* To free the struct: av_free(ptr)
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*/
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struct AVTWOFISH *av_twofish_alloc(void);
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/**
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* Initialize an AVTWOFISH context.
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*
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* @param ctx an AVTWOFISH context
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* @param key a key of size ranging from 1 to 32 bytes used for encryption/decryption
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* @param key_bits number of keybits: 128, 192, 256 If less than the required, padded with zeroes to nearest valid value; return value is 0 if key_bits is 128/192/256, -1 if less than 0, 1 otherwise
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*/
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int av_twofish_init(struct AVTWOFISH *ctx, const uint8_t *key, int key_bits);
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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 AVTWOFISH 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 16 byte blocks
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* @paran iv initialization vector for CBC mode, NULL for ECB mode
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* @param decrypt 0 for encryption, 1 for decryption
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*/
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void av_twofish_crypt(struct AVTWOFISH *ctx, uint8_t *dst, const uint8_t *src, 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_TWOFISH_H */
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