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94 lines
2.8 KiB
94 lines
2.8 KiB
/* |
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* A 32-bit implementation of the XTEA 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_XTEA_H |
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#define AVUTIL_XTEA_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 XTEA algorithm |
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* @defgroup lavu_xtea XTEA |
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* @ingroup lavu_crypto |
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* @{ |
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*/ |
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typedef struct AVXTEA { |
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uint32_t key[16]; |
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} AVXTEA; |
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/** |
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* Allocate an AVXTEA context. |
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*/ |
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AVXTEA *av_xtea_alloc(void); |
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/** |
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* Initialize an AVXTEA context. |
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* |
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* @param ctx an AVXTEA context |
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* @param key a key of 16 bytes used for encryption/decryption, |
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* interpreted as big endian 32 bit numbers |
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*/ |
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void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]); |
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/** |
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* Initialize an AVXTEA context. |
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* |
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* @param ctx an AVXTEA context |
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* @param key a key of 16 bytes used for encryption/decryption, |
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* interpreted as little endian 32 bit numbers |
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*/ |
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void av_xtea_le_init(struct AVXTEA *ctx, const uint8_t key[16]); |
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/** |
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* Encrypt or decrypt a buffer using a previously initialized context, |
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* in big endian format. |
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* |
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* @param ctx an AVXTEA 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 then 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_xtea_crypt(struct AVXTEA *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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* Encrypt or decrypt a buffer using a previously initialized context, |
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* in little endian format. |
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* |
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* @param ctx an AVXTEA 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 then 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_xtea_le_crypt(struct AVXTEA *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_XTEA_H */
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