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/* mac result from PRF and HASH functions, for libreswan
*
* Copyright (C) 2019 Andrew Cagney
*
* 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 of the License, or (at your
* option) any later version. See <https://www.gnu.org/licenses/gpl2.txt>.
*
* 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.
*/
#ifndef CRYPT_MAC_H
#define CRYPT_MAC_H
#include <stddef.h> /* for size_t */
#include <stdint.h> /* for uint8_t */
/*
* Structure big enough for all MAC results (returned by PRF and HASH
* functions) returned by crypt_{prf,hash}_final_mac().
*
* See also ike_alg_init() for runtime check that the array is big
* enough.
*
* XXX: the field names (notably the counter intuitive .ptr) are
* chosen so that this structure is "hunk" like and works with hunk()
* macros.
*
*/
struct crypt_mac {
/* size of the mac in bytes */
size_t len;
/* XXX: see note above about why this is called .ptr */
uint8_t ptr[64/*see ike_alg_init() for size check*/];
};
extern const struct crypt_mac empty_mac;
#endif
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