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 * @defgroup lavu_xtea XTEA 29 * @ingroup lavu_crypto 30 * @{ 31 */ 32 33 typedef struct AVXTEA { 34 uint32_t key[16]; 35 } AVXTEA; 36 37 /** 38 * Initialize an AVXTEA context. 39 * 40 * @param ctx an AVXTEA context 41 * @param key a key of 16 bytes used for encryption/decryption 42 */ 43 void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]); 44 45 /** 46 * Encrypt or decrypt a buffer using a previously initialized context. 47 * 48 * @param ctx an AVXTEA context 49 * @param dst destination array, can be equal to src 50 * @param src source array, can be equal to dst 51 * @param count number of 8 byte blocks 52 * @param iv initialization vector for CBC mode, if NULL then ECB will be used 53 * @param decrypt 0 for encryption, 1 for decryption 54 */ 55 void av_xtea_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src, 56 int count, uint8_t *iv, int decrypt); 57 58 /** 59 * @} 60 */ 61 62 #endif /* AVUTIL_XTEA_H */ 63
