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| | |
| | | /* |
| | | * A 32-bit implementation of the XTEA algorithm |
| | | * Copyright (c) 2012 Samuel Pitoiset |
| | | * |
| | | * This file is part of FFmpeg. |
| | | * |
| | | * FFmpeg is free software; you can redistribute it and/or |
| | | * modify it under the terms of the GNU Lesser General Public |
| | | * License as published by the Free Software Foundation; either |
| | | * version 2.1 of the License, or (at your option) any later version. |
| | | * |
| | | * FFmpeg is distributed in the hope that it will be useful, |
| | | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| | | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| | | * Lesser General Public License for more details. |
| | | * |
| | | * You should have received a copy of the GNU Lesser General Public |
| | | * License along with FFmpeg; if not, write to the Free Software |
| | | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| | | */ |
| | | |
| | | #ifndef AVUTIL_XTEA_H |
| | | #define AVUTIL_XTEA_H |
| | | |
| | | #include <stdint.h> |
| | | |
| | | /** |
| | | * @file |
| | | * @brief Public header for libavutil XTEA algorithm |
| | | * @defgroup lavu_xtea XTEA |
| | | * @ingroup lavu_crypto |
| | | * @{ |
| | | */ |
| | | |
| | | typedef struct AVXTEA { |
| | | uint32_t key[16]; |
| | | } AVXTEA; |
| | | |
| | | /** |
| | | * Allocate an AVXTEA context. |
| | | */ |
| | | AVXTEA *av_xtea_alloc(void); |
| | | |
| | | /** |
| | | * Initialize an AVXTEA context. |
| | | * |
| | | * @param ctx an AVXTEA context |
| | | * @param key a key of 16 bytes used for encryption/decryption, |
| | | * interpreted as big endian 32 bit numbers |
| | | */ |
| | | void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]); |
| | | |
| | | /** |
| | | * Initialize an AVXTEA context. |
| | | * |
| | | * @param ctx an AVXTEA context |
| | | * @param key a key of 16 bytes used for encryption/decryption, |
| | | * interpreted as little endian 32 bit numbers |
| | | */ |
| | | void av_xtea_le_init(struct AVXTEA *ctx, const uint8_t key[16]); |
| | | |
| | | /** |
| | | * Encrypt or decrypt a buffer using a previously initialized context, |
| | | * in big endian format. |
| | | * |
| | | * @param ctx an AVXTEA context |
| | | * @param dst destination array, can be equal to src |
| | | * @param src source array, can be equal to dst |
| | | * @param count number of 8 byte blocks |
| | | * @param iv initialization vector for CBC mode, if NULL then ECB will be used |
| | | * @param decrypt 0 for encryption, 1 for decryption |
| | | */ |
| | | void av_xtea_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src, |
| | | int count, uint8_t *iv, int decrypt); |
| | | |
| | | /** |
| | | * Encrypt or decrypt a buffer using a previously initialized context, |
| | | * in little endian format. |
| | | * |
| | | * @param ctx an AVXTEA context |
| | | * @param dst destination array, can be equal to src |
| | | * @param src source array, can be equal to dst |
| | | * @param count number of 8 byte blocks |
| | | * @param iv initialization vector for CBC mode, if NULL then ECB will be used |
| | | * @param decrypt 0 for encryption, 1 for decryption |
| | | */ |
| | | void av_xtea_le_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src, |
| | | int count, uint8_t *iv, int decrypt); |
| | | |
| | | /** |
| | | * @} |
| | | */ |
| | | |
| | | #endif /* AVUTIL_XTEA_H */ |