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comparison lib/libavutil/hmac.h @ 2134:992d2e6f907d

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preparation for libavcodec
author zipi
date Tue, 31 Dec 2013 14:52:14 +0000
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2133:e378232bfd36 2134:992d2e6f907d
1 /*
2 * Copyright (C) 2012 Martin Storsjo
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef AVUTIL_HMAC_H
22 #define AVUTIL_HMAC_H
23
24 #include <stdint.h>
25
26 /**
27 * @defgroup lavu_hmac HMAC
28 * @ingroup lavu_crypto
29 * @{
30 */
31
32 enum AVHMACType {
33 AV_HMAC_MD5,
34 AV_HMAC_SHA1,
35 };
36
37 typedef struct AVHMAC AVHMAC;
38
39 /**
40 * Allocate an AVHMAC context.
41 * @param type The hash function used for the HMAC.
42 */
43 AVHMAC *av_hmac_alloc(enum AVHMACType type);
44
45 /**
46 * Free an AVHMAC context.
47 * @param ctx The context to free, may be NULL
48 */
49 void av_hmac_free(AVHMAC *ctx);
50
51 /**
52 * Initialize an AVHMAC context with an authentication key.
53 * @param ctx The HMAC context
54 * @param key The authentication key
55 * @param keylen The length of the key, in bytes
56 */
57 void av_hmac_init(AVHMAC *ctx, const uint8_t *key, unsigned int keylen);
58
59 /**
60 * Hash data with the HMAC.
61 * @param ctx The HMAC context
62 * @param data The data to hash
63 * @param len The length of the data, in bytes
64 */
65 void av_hmac_update(AVHMAC *ctx, const uint8_t *data, unsigned int len);
66
67 /**
68 * Finish hashing and output the HMAC digest.
69 * @param ctx The HMAC context
70 * @param out The output buffer to write the digest into
71 * @param outlen The length of the out buffer, in bytes
72 * @return The number of bytes written to out, or a negative error code.
73 */
74 int av_hmac_final(AVHMAC *ctx, uint8_t *out, unsigned int outlen);
75
76 /**
77 * Hash an array of data with a key.
78 * @param ctx The HMAC context
79 * @param data The data to hash
80 * @param len The length of the data, in bytes
81 * @param key The authentication key
82 * @param keylen The length of the key, in bytes
83 * @param out The output buffer to write the digest into
84 * @param outlen The length of the out buffer, in bytes
85 * @return The number of bytes written to out, or a negative error code.
86 */
87 int av_hmac_calc(AVHMAC *ctx, const uint8_t *data, unsigned int len,
88 const uint8_t *key, unsigned int keylen,
89 uint8_t *out, unsigned int outlen);
90
91 /**
92 * @}
93 */
94
95 #endif /* AVUTIL_HMAC_H */