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4349 | Serge | 1 | /* |
2 | * Copyright (C) 2012 Martin Storsjo |
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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 | |||
21 | #ifndef AVUTIL_HMAC_H |
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22 | #define AVUTIL_HMAC_H |
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23 | |||
24 | #include |
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25 | |||
26 | /** |
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27 | * @defgroup lavu_hmac HMAC |
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28 | * @ingroup lavu_crypto |
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29 | * @{ |
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30 | */ |
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31 | |||
32 | enum AVHMACType { |
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33 | AV_HMAC_MD5, |
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34 | AV_HMAC_SHA1, |
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35 | AV_HMAC_SHA224 = 10, |
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36 | AV_HMAC_SHA256, |
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37 | AV_HMAC_SHA384, |
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38 | AV_HMAC_SHA512, |
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39 | }; |
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40 | |||
41 | typedef struct AVHMAC AVHMAC; |
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42 | |||
43 | /** |
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44 | * Allocate an AVHMAC context. |
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45 | * @param type The hash function used for the HMAC. |
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46 | */ |
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47 | AVHMAC *av_hmac_alloc(enum AVHMACType type); |
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48 | |||
49 | /** |
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50 | * Free an AVHMAC context. |
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51 | * @param ctx The context to free, may be NULL |
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52 | */ |
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53 | void av_hmac_free(AVHMAC *ctx); |
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54 | |||
55 | /** |
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56 | * Initialize an AVHMAC context with an authentication key. |
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57 | * @param ctx The HMAC context |
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58 | * @param key The authentication key |
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59 | * @param keylen The length of the key, in bytes |
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60 | */ |
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61 | void av_hmac_init(AVHMAC *ctx, const uint8_t *key, unsigned int keylen); |
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62 | |||
63 | /** |
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64 | * Hash data with the HMAC. |
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65 | * @param ctx The HMAC context |
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66 | * @param data The data to hash |
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67 | * @param len The length of the data, in bytes |
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68 | */ |
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69 | void av_hmac_update(AVHMAC *ctx, const uint8_t *data, unsigned int len); |
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70 | |||
71 | /** |
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72 | * Finish hashing and output the HMAC digest. |
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73 | * @param ctx The HMAC context |
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74 | * @param out The output buffer to write the digest into |
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75 | * @param outlen The length of the out buffer, in bytes |
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76 | * @return The number of bytes written to out, or a negative error code. |
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77 | */ |
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78 | int av_hmac_final(AVHMAC *ctx, uint8_t *out, unsigned int outlen); |
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79 | |||
80 | /** |
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81 | * Hash an array of data with a key. |
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82 | * @param ctx The HMAC context |
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83 | * @param data The data to hash |
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84 | * @param len The length of the data, in bytes |
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85 | * @param key The authentication key |
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86 | * @param keylen The length of the key, in bytes |
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87 | * @param out The output buffer to write the digest into |
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88 | * @param outlen The length of the out buffer, in bytes |
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89 | * @return The number of bytes written to out, or a negative error code. |
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90 | */ |
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91 | int av_hmac_calc(AVHMAC *ctx, const uint8_t *data, unsigned int len, |
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92 | const uint8_t *key, unsigned int keylen, |
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93 | uint8_t *out, unsigned int outlen); |
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94 | |||
95 | /** |
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96 | * @} |
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97 | */ |
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98 | |||
99 | #endif /* AVUTIL_HMAC_H */ |