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