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/* $OpenBSD: hash.c,v 1.17 2004/06/14 09:55:41 ho Exp $ */
/* $EOM: hash.c,v 1.10 1999/04/17 23:20:34 niklas Exp $ */
/*
* Copyright (c) 1998 Niels Provos. All rights reserved.
* Copyright (c) 1999 Niklas Hallqvist. 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.
*/
#include <sys/param.h>
#include <string.h>
#if defined (__APPLE__)
#include <openssl/md5.h>
#include <openssl/sha.h>
#else
#include <md5.h>
#include <sha1.h>
#endif /* __APPLE__ */
#include "sysdep.h"
#include "hash.h"
#include "log.h"
void hmac_init(struct hash *, unsigned char *, unsigned int);
void hmac_final(unsigned char *, struct hash *);
/* Temporary hash contexts. */
static union {
MD5_CTX md5ctx;
SHA1_CTX sha1ctx;
} Ctx, Ctx2;
/* Temporary hash digest. */
static unsigned char digest[HASH_MAX];
/* Encapsulation of hash functions. */
static struct hash hashes[] = {
{
HASH_MD5, 5, MD5_SIZE, (void *)&Ctx.md5ctx, digest,
sizeof(MD5_CTX), (void *)&Ctx2.md5ctx,
(void (*)(void *))MD5Init,
(void (*)(void *, unsigned char *, unsigned int))MD5Update,
(void (*)(unsigned char *, void *))MD5Final,
hmac_init,
hmac_final
}, {
HASH_SHA1, 6, SHA1_SIZE, (void *)&Ctx.sha1ctx, digest,
sizeof(SHA1_CTX), (void *)&Ctx2.sha1ctx,
(void (*)(void *))SHA1Init,
(void (*)(void *, unsigned char *, unsigned int))SHA1Update,
(void (*)(unsigned char *, void *))SHA1Final,
hmac_init,
hmac_final
},
};
struct hash *
hash_get(enum hashes hashtype)
{
size_t i;
LOG_DBG((LOG_CRYPTO, 60, "hash_get: requested algorithm %d",
hashtype));
for (i = 0; i < sizeof hashes / sizeof hashes[0]; i++)
if (hashtype == hashes[i].type)
return &hashes[i];
return 0;
}
/*
* Initial a hash for HMAC usage this requires a special init function.
* ctx, ctx2 hold the contexts, if you want to use the hash object for
* something else in the meantime, be sure to store the contexts somewhere.
*/
void
hmac_init(struct hash *hash, unsigned char *okey, unsigned int len)
{
unsigned int i, blocklen = HMAC_BLOCKLEN;
unsigned char key[HMAC_BLOCKLEN];
memset(key, 0, blocklen);
if (len > blocklen) {
/* Truncate key down to blocklen */
hash->Init(hash->ctx);
hash->Update(hash->ctx, okey, len);
hash->Final(key, hash->ctx);
} else {
memcpy(key, okey, len);
}
/* HMAC I and O pad computation */
for (i = 0; i < blocklen; i++)
key[i] ^= HMAC_IPAD_VAL;
hash->Init(hash->ctx);
hash->Update(hash->ctx, key, blocklen);
for (i = 0; i < blocklen; i++)
key[i] ^= (HMAC_IPAD_VAL ^ HMAC_OPAD_VAL);
hash->Init(hash->ctx2);
hash->Update(hash->ctx2, key, blocklen);
memset(key, 0, blocklen);
}
/*
* HMAC Final function
*/
void
hmac_final(unsigned char *dgst, struct hash *hash)
{
hash->Final(dgst, hash->ctx);
hash->Update(hash->ctx2, dgst, hash->hashsize);
hash->Final(dgst, hash->ctx2);
}
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