xtea.h (1764B)
1 /* 2 * A 32-bit implementation of the XTEA algorithm 3 * 4 * This file is part of Libav. 5 * 6 * Libav is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * Libav is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with Libav; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21 #ifndef AVUTIL_XTEA_H 22 #define AVUTIL_XTEA_H 23 24 #include <stdint.h> 25 26 /** 27 * @defgroup lavu_xtea XTEA 28 * @ingroup lavu_crypto 29 * @{ 30 */ 31 32 typedef struct AVXTEA { 33 uint32_t key[16]; 34 } AVXTEA; 35 36 /** 37 * Initialize an AVXTEA context. 38 * 39 * @param ctx an AVXTEA context 40 * @param key a key of 16 bytes used for encryption/decryption 41 */ 42 void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]); 43 44 /** 45 * Encrypt or decrypt a buffer using a previously initialized context. 46 * 47 * @param ctx an AVXTEA context 48 * @param dst destination array, can be equal to src 49 * @param src source array, can be equal to dst 50 * @param count number of 8 byte blocks 51 * @param iv initialization vector for CBC mode, if NULL then ECB will be used 52 * @param decrypt 0 for encryption, 1 for decryption 53 */ 54 void av_xtea_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src, 55 int count, uint8_t *iv, int decrypt); 56 57 /** 58 * @} 59 */ 60 61 #endif /* AVUTIL_XTEA_H */