2 * Copyright (C) 2012 Martin Storsjo
4 * This file is part of Libav.
6 * Libav 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.
11 * Libav 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.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 * @defgroup lavu_hmac HMAC
28 * @ingroup lavu_crypto
39 typedef struct AVHMAC AVHMAC;
42 * Allocate an AVHMAC context.
43 * @param type The hash function used for the HMAC.
45 AVHMAC *av_hmac_alloc(enum AVHMACType type);
48 * Free an AVHMAC context.
49 * @param ctx The context to free, may be NULL
51 void av_hmac_free(AVHMAC *ctx);
54 * Initialize an AVHMAC context with an authentication key.
55 * @param ctx The HMAC context
56 * @param key The authentication key
57 * @param keylen The length of the key, in bytes
59 void av_hmac_init(AVHMAC *ctx, const uint8_t *key, unsigned int keylen);
62 * Hash data with the HMAC.
63 * @param ctx The HMAC context
64 * @param data The data to hash
65 * @param len The length of the data, in bytes
67 void av_hmac_update(AVHMAC *ctx, const uint8_t *data, unsigned int len);
70 * Finish hashing and output the HMAC digest.
71 * @param ctx The HMAC context
72 * @param out The output buffer to write the digest into
73 * @param outlen The length of the out buffer, in bytes
74 * @return The number of bytes written to out, or a negative error code.
76 int av_hmac_final(AVHMAC *ctx, uint8_t *out, unsigned int outlen);
79 * Hash an array of data with a key.
80 * @param ctx The HMAC context
81 * @param data The data to hash
82 * @param len The length of the data, in bytes
83 * @param key The authentication key
84 * @param keylen The length of the key, in bytes
85 * @param out The output buffer to write the digest into
86 * @param outlen The length of the out buffer, in bytes
87 * @return The number of bytes written to out, or a negative error code.
89 int av_hmac_calc(AVHMAC *ctx, const uint8_t *data, unsigned int len,
90 const uint8_t *key, unsigned int keylen,
91 uint8_t *out, unsigned int outlen);
97 #endif /* AVUTIL_HMAC_H */