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/* $OpenBSD: hash.h,v 1.9 2024/11/21 10:07:30 yasuoka Exp $ */
/* $EOM: hash.h,v 1.6 1998/07/25 22:04:36 niklas Exp $ */
/*
* Copyright (c) 1998 Niels Provos. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This code was written under funding by Ericsson Radio Systems.
*/
#ifndef _HASH_H_
#define _HASH_H_
/* Normal mode hash encapsulation */
#define MD5_SIZE 16
#define SHA1_SIZE 20
#define SHA2_256_SIZE 32
#define SHA2_384_SIZE 48
#define SHA2_512_SIZE 64
#define HASH_MAX SHA2_512_SIZE
enum hashes {
HASH_MD5 = 0,
HASH_SHA1,
HASH_SHA2_256,
HASH_SHA2_384,
HASH_SHA2_512
};
struct hash {
enum hashes type;
int id; /* ISAKMP/Oakley ID */
u_int8_t hashsize; /* Size of the hash */
unsigned blocklen; /* The hash's block length */
void *ctx; /* Pointer to a context, for HMAC ictx */
unsigned char *digest; /* Pointer to a digest */
int ctxsize;
void *ctx2; /* Pointer to a 2nd context, for HMAC octx */
void (*Init) (void *);
void (*Update) (void *, unsigned char *, unsigned int);
void (*Final) (unsigned char *, void *);
void (*HMACInit) (struct hash *, unsigned char *, unsigned int);
void (*HMACFinal) (unsigned char *, struct hash *);
};
/* HMAC Hash Encapsulation */
#define HMAC_IPAD_VAL 0x36
#define HMAC_OPAD_VAL 0x5C
extern struct hash *hash_get(enum hashes);
extern void hmac_init(struct hash *, unsigned char *, unsigned int);
#endif /* _HASH_H_ */
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