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2134
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1 /*
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2 * copyright (c) 2007 Michael Niedermayer <michaelni@gmx.at>
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3 *
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4 * This file is part of FFmpeg.
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5 *
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6 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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_AES_H
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22 #define AVUTIL_AES_H
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23
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24 #include <stdint.h>
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25
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26 #include "attributes.h"
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27 #include "version.h"
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28
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29 /**
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30 * @defgroup lavu_aes AES
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31 * @ingroup lavu_crypto
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32 * @{
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33 */
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34
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35 extern const int av_aes_size;
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36
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37 struct AVAES;
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38
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39 /**
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40 * Allocate an AVAES context.
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41 */
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42 struct AVAES *av_aes_alloc(void);
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43
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44 /**
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45 * Initialize an AVAES context.
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46 * @param key_bits 128, 192 or 256
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47 * @param decrypt 0 for encryption, 1 for decryption
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48 */
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49 int av_aes_init(struct AVAES *a, const uint8_t *key, int key_bits, int decrypt);
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50
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51 /**
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52 * Encrypt or decrypt a buffer using a previously initialized context.
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53 * @param count number of 16 byte blocks
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54 * @param dst destination array, can be equal to src
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55 * @param src source array, can be equal to dst
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56 * @param iv initialization vector for CBC mode, if NULL then ECB will be used
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57 * @param decrypt 0 for encryption, 1 for decryption
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58 */
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59 void av_aes_crypt(struct AVAES *a, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
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60
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61 /**
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62 * @}
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63 */
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64
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65 #endif /* AVUTIL_AES_H */
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