1/* 2 * A 32-bit implementation of the XTEA algorithm 3 * Copyright (c) 2012 Samuel Pitoiset 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#ifndef AVUTIL_XTEA_H 23#define AVUTIL_XTEA_H 24 25#include <stdint.h> 26 27/** 28 * @file 29 * @brief Public header for libavutil XTEA algorithm 30 * @defgroup lavu_xtea XTEA 31 * @ingroup lavu_crypto 32 * @{ 33 */ 34 35typedef struct AVXTEA { 36 uint32_t key[16]; 37} AVXTEA; 38 39/** 40 * Initialize an AVXTEA context. 41 * 42 * @param ctx an AVXTEA context 43 * @param key a key of 16 bytes used for encryption/decryption 44 */ 45void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]); 46 47/** 48 * Encrypt or decrypt a buffer using a previously initialized context. 49 * 50 * @param ctx an AVXTEA context 51 * @param dst destination array, can be equal to src 52 * @param src source array, can be equal to dst 53 * @param count number of 8 byte blocks 54 * @param iv initialization vector for CBC mode, if NULL then ECB will be used 55 * @param decrypt 0 for encryption, 1 for decryption 56 */ 57void av_xtea_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src, 58 int count, uint8_t *iv, int decrypt); 59 60/** 61 * @} 62 */ 63 64#endif /* AVUTIL_XTEA_H */ 65