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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_SHA_H
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22 #define AVUTIL_SHA_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_sha SHA
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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_sha_size;
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36
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37 struct AVSHA;
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38
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39 /**
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40 * Allocate an AVSHA context.
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41 */
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42 struct AVSHA *av_sha_alloc(void);
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43
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44 /**
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45 * Initialize SHA-1 or SHA-2 hashing.
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46 *
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47 * @param context pointer to the function context (of size av_sha_size)
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48 * @param bits number of bits in digest (SHA-1 - 160 bits, SHA-2 224 or 256 bits)
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49 * @return zero if initialization succeeded, -1 otherwise
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50 */
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51 int av_sha_init(struct AVSHA* context, int bits);
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52
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53 /**
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54 * Update hash value.
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55 *
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56 * @param context hash function context
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57 * @param data input data to update hash with
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58 * @param len input data length
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59 */
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60 void av_sha_update(struct AVSHA* context, const uint8_t* data, unsigned int len);
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61
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62 /**
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63 * Finish hashing and output digest value.
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64 *
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65 * @param context hash function context
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66 * @param digest buffer where output digest value is stored
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67 */
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68 void av_sha_final(struct AVSHA* context, uint8_t *digest);
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69
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70 /**
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71 * @}
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72 */
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73
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74 #endif /* AVUTIL_SHA_H */
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