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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	sbin/isakmpd/hash.c	Lines:	0	25	0.0 %
Date:	2017-11-13	Branches:	0	10	0.0 %


/* $OpenBSD: hash.c,v 1.24 2015/10/15 06:35:54 mmcc 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/types.h>
#include <string.h>
#include <md5.h>
#include <sha1.h>
#include <sha2.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;
	SHA2_CTX	sha2ctx;
} 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
    }, {
	HASH_SHA2_256, 7, SHA2_256_SIZE, (void *)&Ctx.sha2ctx, digest,
	sizeof(SHA2_CTX), (void *)&Ctx2.sha2ctx,
	(void (*)(void *))SHA256Init,
	(void (*)(void *, unsigned char *, unsigned int))SHA256Update,
	(void (*)(u_int8_t *, void *))SHA256Final,
	hmac_init,
	hmac_final
    }, {
	HASH_SHA2_384, 8, SHA2_384_SIZE, (void *)&Ctx.sha2ctx, digest,
	sizeof(SHA2_CTX), (void *)&Ctx2.sha2ctx,
	(void (*)(void *))SHA384Init,
	(void (*)(void *, unsigned char *, unsigned int))SHA384Update,
	(void (*)(u_int8_t *, void *))SHA384Final,
	hmac_init,
	hmac_final
    }, {
	HASH_SHA2_512, 9, SHA2_512_SIZE, (void *)&Ctx.sha2ctx, digest,
	sizeof(SHA2_CTX), (void *)&Ctx2.sha2ctx,
	(void (*)(void *))SHA512Init,
	(void (*)(void *, unsigned char *, unsigned int))SHA512Update,
	(void (*)(u_int8_t *, void *))SHA512Final,
	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];

	bzero(key, 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);

	explicit_bzero(key, 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);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: hash.c,v 1.24 2015/10/15 06:35:54 mmcc Exp $ */
2			/* $EOM: hash.c,v 1.10 1999/04/17 23:20:34 niklas Exp $ */
3
4			/*
5			* Copyright (c) 1998 Niels Provos. All rights reserved.
6			* Copyright (c) 1999 Niklas Hallqvist. All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			* 1. Redistributions of source code must retain the above copyright
12			* notice, this list of conditions and the following disclaimer.
13			* 2. Redistributions in binary form must reproduce the above copyright
14			* notice, this list of conditions and the following disclaimer in the
15			* documentation and/or other materials provided with the distribution.
16			*
17			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18			* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20			* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21			* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23			* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24			* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25			* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26			* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27			*/
28
29			/*
30			* This code was written under funding by Ericsson Radio Systems.
31			*/
32
33			#include <sys/types.h>
34			#include <string.h>
35			#include <md5.h>
36			#include <sha1.h>
37			#include <sha2.h>
38
39			#include "hash.h"
40			#include "log.h"
41
42			void hmac_init(struct hash , unsigned char , unsigned int);
43			void hmac_final(unsigned char , struct hash );
44
45			/* Temporary hash contexts. */
46			static union {
47			MD5_CTX md5ctx;
48			SHA1_CTX sha1ctx;
49			SHA2_CTX sha2ctx;
50			} Ctx, Ctx2;
51
52			/* Temporary hash digest. */
53			static unsigned char digest[HASH_MAX];
54
55			/* Encapsulation of hash functions. */
56
57			static struct hash hashes[] = {
58			{
59			HASH_MD5, 5, MD5_SIZE, (void *)&Ctx.md5ctx, digest,
60			sizeof(MD5_CTX), (void *)&Ctx2.md5ctx,
61			(void ()(void ))MD5Init,
62			(void ()(void , unsigned char *, unsigned int))MD5Update,
63			(void ()(unsigned char , void *))MD5Final,
64			hmac_init,
65			hmac_final
66			}, {
67			HASH_SHA1, 6, SHA1_SIZE, (void *)&Ctx.sha1ctx, digest,
68			sizeof(SHA1_CTX), (void *)&Ctx2.sha1ctx,
69			(void ()(void ))SHA1Init,
70			(void ()(void , unsigned char *, unsigned int))SHA1Update,
71			(void ()(unsigned char , void *))SHA1Final,
72			hmac_init,
73			hmac_final
74			}, {
75			HASH_SHA2_256, 7, SHA2_256_SIZE, (void *)&Ctx.sha2ctx, digest,
76			sizeof(SHA2_CTX), (void *)&Ctx2.sha2ctx,
77			(void ()(void ))SHA256Init,
78			(void ()(void , unsigned char *, unsigned int))SHA256Update,
79			(void ()(u_int8_t , void *))SHA256Final,
80			hmac_init,
81			hmac_final
82			}, {
83			HASH_SHA2_384, 8, SHA2_384_SIZE, (void *)&Ctx.sha2ctx, digest,
84			sizeof(SHA2_CTX), (void *)&Ctx2.sha2ctx,
85			(void ()(void ))SHA384Init,
86			(void ()(void , unsigned char *, unsigned int))SHA384Update,
87			(void ()(u_int8_t , void *))SHA384Final,
88			hmac_init,
89			hmac_final
90			}, {
91			HASH_SHA2_512, 9, SHA2_512_SIZE, (void *)&Ctx.sha2ctx, digest,
92			sizeof(SHA2_CTX), (void *)&Ctx2.sha2ctx,
93			(void ()(void ))SHA512Init,
94			(void ()(void , unsigned char *, unsigned int))SHA512Update,
95			(void ()(u_int8_t , void *))SHA512Final,
96			hmac_init,
97			hmac_final
98			}
99			};
100
101			struct hash *
102			hash_get(enum hashes hashtype)
103			{
104			size_t i;
105
106			LOG_DBG((LOG_CRYPTO, 60, "hash_get: requested algorithm %d",
107			hashtype));
108
109			for (i = 0; i < sizeof hashes / sizeof hashes[0]; i++)
110			if (hashtype == hashes[i].type)
111			return &hashes[i];
112
113			return 0;
114			}
115
116			/*
117			* Initial a hash for HMAC usage this requires a special init function.
118			* ctx, ctx2 hold the contexts, if you want to use the hash object for
119			* something else in the meantime, be sure to store the contexts somewhere.
120			*/
121
122			void
123			hmac_init(struct hash hash, unsigned char okey, unsigned int len)
124			{
125			unsigned int i, blocklen = HMAC_BLOCKLEN;
126			unsigned char key[HMAC_BLOCKLEN];
127
128			bzero(key, blocklen);
129			if (len > blocklen) {
130			/* Truncate key down to blocklen */
131			hash->Init(hash->ctx);
132			hash->Update(hash->ctx, okey, len);
133			hash->Final(key, hash->ctx);
134			} else {
135			memcpy(key, okey, len);
136			}
137
138			/* HMAC I and O pad computation */
139			for (i = 0; i < blocklen; i++)
140			key[i] ^= HMAC_IPAD_VAL;
141
142			hash->Init(hash->ctx);
143			hash->Update(hash->ctx, key, blocklen);
144
145			for (i = 0; i < blocklen; i++)
146			key[i] ^= (HMAC_IPAD_VAL ^ HMAC_OPAD_VAL);
147
148			hash->Init(hash->ctx2);
149			hash->Update(hash->ctx2, key, blocklen);
150
151			explicit_bzero(key, blocklen);
152			}
153
154			/*
155			* HMAC Final function
156			*/
157
158			void
159			hmac_final(unsigned char dgst, struct hash hash)
160			{
161			hash->Final(dgst, hash->ctx);
162			hash->Update(hash->ctx2, dgst, hash->hashsize);
163			hash->Final(dgst, hash->ctx2);
164			}