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/* hmac.h -- hashed message authentication codes
Copyright (C) 2005, 2009-2020 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <https://www.gnu.org/licenses/>. */
/* Written by Simon Josefsson. */
#ifndef HMAC_H
# define HMAC_H 1
#include <stddef.h>
/* Compute Hashed Message Authentication Code with MD5, as described
in RFC 2104, over BUFFER data of BUFLEN bytes using the KEY of
KEYLEN bytes, writing the output to pre-allocated 16 byte minimum
RESBUF buffer. Return 0 on success. */
int
hmac_md5 (const void *key, size_t keylen,
const void *buffer, size_t buflen, void *restrict resbuf);
/* Compute Hashed Message Authentication Code with SHA-1, over BUFFER
data of BUFLEN bytes using the KEY of KEYLEN bytes, writing the
output to pre-allocated 20 byte minimum RESBUF buffer. Return 0 on
success. */
int
hmac_sha1 (const void *key, size_t keylen,
const void *in, size_t inlen, void *restrict resbuf);
/* Compute Hashed Message Authentication Code with SHA-256, over BUFFER
data of BUFLEN bytes using the KEY of KEYLEN bytes, writing the
output to pre-allocated 32 byte minimum RESBUF buffer. Return 0 on
success. */
int
hmac_sha256 (const void *key, size_t keylen,
const void *in, size_t inlen, void *restrict resbuf);
/* Compute Hashed Message Authentication Code with SHA-512, over BUFFER
data of BUFLEN bytes using the KEY of KEYLEN bytes, writing the
output to pre-allocated 64 byte minimum RESBUF buffer. Return 0 on
success. */
int
hmac_sha512 (const void *key, size_t keylen,
const void *in, size_t inlen, void *restrict resbuf);
#endif /* HMAC_H */
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