Edit File: xtea.h
/* * 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> #include "version.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 */ void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]); /** * Encrypt or decrypt a buffer using a previously initialized context. * * @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); /** * @} */ #endif /* AVUTIL_XTEA_H */