xref: /titanic_44/usr/src/common/net/wanboot/crypt/hmac_sha1.c (revision 7c478bd95313f5f23a4c958a745db2134aa03244)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2002-2003 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 #include <sys/sha1.h>
30 #include <sys/sha1_consts.h>
31 #include "hmac_sha1.h"
32 
33 static void
HMACHashKey(uchar_t * hashedKey,const uchar_t * key,size_t klen)34 HMACHashKey(uchar_t *hashedKey, const uchar_t *key, size_t klen)
35 {
36 	SHA1_CTX keyContext;
37 
38 	SHA1Init(&keyContext);
39 	SHA1Update(&keyContext, key, klen);
40 	SHA1Final(hashedKey, &keyContext);
41 }
42 
43 void
HMACInit(SHA1_CTX * sha1Context,const uchar_t * key,size_t klen)44 HMACInit(SHA1_CTX *sha1Context, const uchar_t *key, size_t klen)
45 {
46 	uchar_t hashedKey[20];
47 	const uchar_t *keyptr;
48 	uchar_t kipad[64];
49 	int i;
50 
51 	if (klen > 64) {
52 		HMACHashKey(hashedKey, key, klen);
53 		keyptr = hashedKey;
54 		klen = 20;
55 	} else {
56 		keyptr = key;
57 	}
58 
59 	/* kipad = K XOR ipad */
60 	for (i = 0; i < 64; i++) {
61 		kipad[i] = (i < klen ? keyptr[i] : 0) ^ 0x36;
62 	}
63 
64 	SHA1Init(sha1Context);
65 	SHA1Update(sha1Context, kipad, 64);
66 }
67 
68 void
HMACUpdate(SHA1_CTX * sha1Context,const uchar_t * data,size_t dlen)69 HMACUpdate(SHA1_CTX *sha1Context, const uchar_t *data, size_t dlen)
70 {
71 	SHA1Update(sha1Context, data, dlen);
72 }
73 
74 void
HMACFinal(SHA1_CTX * sha1Context,const uchar_t * key,size_t klen,uchar_t digest[20])75 HMACFinal(SHA1_CTX *sha1Context, const uchar_t *key, size_t klen,
76     uchar_t digest[20])
77 {
78 	uchar_t hashedKey[20];
79 	const uchar_t *keyptr;
80 	uchar_t kopad[64];
81 	int i;
82 
83 	if (klen > 64) {
84 		HMACHashKey(hashedKey, key, klen);
85 		keyptr = hashedKey;
86 		klen = 20;
87 	} else {
88 		keyptr = key;
89 	}
90 
91 	/* kopad = K XOR opad */
92 	for (i = 0; i < 64; i++) {
93 		kopad[i] = (i < klen ? keyptr[i] : 0) ^ 0x5c;
94 	}
95 
96 	/* Compute H(kopad, H(kipad, text)) */
97 	SHA1Final(digest, sha1Context);
98 
99 	SHA1Init(sha1Context);
100 	SHA1Update(sha1Context, kopad, 64);
101 	SHA1Update(sha1Context, digest, 20);
102 	SHA1Final(digest, sha1Context);
103 }
104