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2134
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1 /*
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2 * A 32-bit implementation of the XTEA algorithm
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3 * Copyright (c) 2012 Samuel Pitoiset
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4 *
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5 * This file is part of FFmpeg.
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6 *
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7 * FFmpeg is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
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9 * License as published by the Free Software Foundation; either
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10 * version 2.1 of the License, or (at your option) any later version.
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11 *
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12 * FFmpeg is distributed in the hope that it will be useful,
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with FFmpeg; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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20 */
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21
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22 #ifndef AVUTIL_XTEA_H
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23 #define AVUTIL_XTEA_H
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24
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25 #include <stdint.h>
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26
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27 /**
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28 * @defgroup lavu_xtea XTEA
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29 * @ingroup lavu_crypto
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30 * @{
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31 */
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32
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33 typedef struct AVXTEA {
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34 uint32_t key[16];
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35 } AVXTEA;
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36
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37 /**
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38 * Initialize an AVXTEA context.
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39 *
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40 * @param ctx an AVXTEA context
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41 * @param key a key of 16 bytes used for encryption/decryption
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42 */
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43 void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]);
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44
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45 /**
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46 * Encrypt or decrypt a buffer using a previously initialized context.
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47 *
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48 * @param ctx an AVXTEA context
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49 * @param dst destination array, can be equal to src
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50 * @param src source array, can be equal to dst
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51 * @param count number of 8 byte blocks
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52 * @param iv initialization vector for CBC mode, if NULL then ECB will be used
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53 * @param decrypt 0 for encryption, 1 for decryption
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54 */
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55 void av_xtea_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
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56 int count, uint8_t *iv, int decrypt);
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57
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58 /**
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59 * @}
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60 */
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61
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62 #endif /* AVUTIL_XTEA_H */
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