81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
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/*
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* An implementation of the CAST128 algorithm as mentioned in RFC2144
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* Copyright (c) 2014 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_CAST5_H
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#define AVUTIL_CAST5_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 CAST5 algorithm
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* @defgroup lavu_cast5 CAST5
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* @ingroup lavu_crypto
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* @{
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*/
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extern const int av_cast5_size;
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struct AVCAST5;
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/**
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* Allocate an AVCAST5 context
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* To free the struct: av_free(ptr)
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*/
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struct AVCAST5 *av_cast5_alloc(void);
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/**
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* Initialize an AVCAST5 context.
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*
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* @param ctx an AVCAST5 context
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* @param key a key of 5,6,...16 bytes used for encryption/decryption
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* @param key_bits number of keybits: possible are 40,48,...,128
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* @return 0 on success, less than 0 on failure
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*/
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int av_cast5_init(struct AVCAST5 *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, ECB mode only
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*
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* @param ctx an AVCAST5 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 decrypt 0 for encryption, 1 for decryption
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*/
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void av_cast5_crypt(struct AVCAST5 *ctx, uint8_t *dst, const uint8_t *src, int count, 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 AVCAST5 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, 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_cast5_crypt2(struct AVCAST5 *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_CAST5_H */
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