Annotation of src/lib/libc/hash/hmac.c, Revision 1.4
1.4 ! christos 1: /* $NetBSD: hmac.c,v 1.3 2016/07/01 22:41:39 christos Exp $ */
1.3 christos 2:
3: /*-
4: * Copyright (c) 2016 The NetBSD Foundation, Inc.
1.1 sjg 5: * All rights reserved.
1.3 christos 6: *
7: * This code is derived from software contributed to The NetBSD Foundation
8: * by Christos Zoulas.
9: *
1.1 sjg 10: * Redistribution and use in source and binary forms, with or without
1.3 christos 11: * modification, are permitted provided that the following conditions
12: * are met:
1.1 sjg 13: * 1. Redistributions of source code must retain the above copyright
1.3 christos 14: * notice, this list of conditions and the following disclaimer.
1.1 sjg 15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
1.3 christos 17: * documentation and/or other materials provided with the distribution.
1.1 sjg 18: *
1.3 christos 19: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29: * POSSIBILITY OF SUCH DAMAGE.
1.1 sjg 30: */
31: #include <sys/cdefs.h>
1.4 ! christos 32: __RCSID("$NetBSD: hmac.c,v 1.3 2016/07/01 22:41:39 christos Exp $");
1.1 sjg 33:
1.3 christos 34: #include <string.h>
1.1 sjg 35: #include <stdlib.h>
36:
1.3 christos 37: #include <md2.h>
38: #include <md4.h>
39: #include <md5.h>
40: #include <rmd160.h>
41: #include <sha1.h>
42: #include <sha2.h>
43:
44: #define HMAC_SIZE 128
45: #define HMAC_IPAD 0x36
46: #define HMAC_OPAD 0x5C
47:
48: static const struct hmac {
49: const char *name;
50: size_t ctxsize;
51: size_t digsize;
52: size_t blocksize;
53: void (*init)(void *);
54: void (*update)(void *, const uint8_t *, unsigned int);
55: void (*final)(uint8_t *, void *);
56: } hmacs[] = {
57: {
58: "md2", sizeof(MD2_CTX), MD2_DIGEST_LENGTH, MD2_BLOCK_LENGTH,
59: (void *)MD2Init, (void *)MD2Update, (void *)MD2Final,
60: },
61: {
62: "md4", sizeof(MD4_CTX), MD4_DIGEST_LENGTH, MD4_BLOCK_LENGTH,
63: (void *)MD4Init, (void *)MD4Update, (void *)MD4Final,
64: },
65: {
66: "md5", sizeof(MD5_CTX), MD5_DIGEST_LENGTH, MD5_BLOCK_LENGTH,
67: (void *)MD5Init, (void *)MD5Update, (void *)MD5Final,
68: },
69: {
70: "rmd160", sizeof(RMD160_CTX), RMD160_DIGEST_LENGTH,
71: RMD160_BLOCK_LENGTH,
72: (void *)RMD160Init, (void *)RMD160Update, (void *)RMD160Final,
73: },
1.1 sjg 74: {
1.3 christos 75: "sha1", sizeof(SHA1_CTX), SHA1_DIGEST_LENGTH, SHA1_BLOCK_LENGTH,
76: (void *)SHA1Init, (void *)SHA1Update, (void *)SHA1Final,
1.1 sjg 77: },
78: {
1.3 christos 79: "sha224", sizeof(SHA224_CTX), SHA224_DIGEST_LENGTH,
80: SHA224_BLOCK_LENGTH,
81: (void *)SHA224_Init, (void *)SHA224_Update,
82: (void *)SHA224_Final,
1.1 sjg 83: },
84: {
1.3 christos 85: "sha256", sizeof(SHA256_CTX), SHA256_DIGEST_LENGTH,
86: SHA256_BLOCK_LENGTH,
87: (void *)SHA256_Init, (void *)SHA256_Update,
88: (void *)SHA256_Final,
1.1 sjg 89: },
90: {
1.3 christos 91: "sha384", sizeof(SHA384_CTX), SHA384_DIGEST_LENGTH,
92: SHA384_BLOCK_LENGTH,
93: (void *)SHA384_Init, (void *)SHA384_Update,
94: (void *)SHA384_Final,
1.1 sjg 95: },
96: {
1.3 christos 97: "sha512", sizeof(SHA512_CTX), SHA512_DIGEST_LENGTH,
98: SHA512_BLOCK_LENGTH,
99: (void *)SHA512_Init, (void *)SHA512_Update,
100: (void *)SHA512_Final,
1.1 sjg 101: },
1.3 christos 102: };
103:
104: static const struct hmac *
105: hmac_find(const char *name)
106: {
107: for (size_t i = 0; i < __arraycount(hmacs); i++) {
108: if (strcmp(hmacs[i].name, name) != 0)
109: continue;
110: return &hmacs[i];
1.1 sjg 111: }
1.3 christos 112: return NULL;
1.1 sjg 113: }
114:
1.3 christos 115: ssize_t
116: hmac(const char *name,
117: const void *key, size_t klen,
118: const void *text, size_t tlen,
119: void *digest, size_t dlen)
120: {
121: uint8_t ipad[HMAC_SIZE], opad[HMAC_SIZE], d[HMAC_SIZE];
122: const uint8_t *k = key;
123: const struct hmac *h;
124: uint64_t c[32];
125: void *p;
126:
127: if ((h = hmac_find(name)) == NULL)
128: return -1;
129:
130:
131: if (klen > h->blocksize) {
132: (*h->init)(c);
133: (*h->update)(c, k, (unsigned int)klen);
134: (*h->final)(d, c);
135: k = (void *)d;
136: klen = h->digsize;
137: }
138:
139: /* Form input and output pads for the digests */
140: for (size_t i = 0; i < sizeof(ipad); i++) {
141: ipad[i] = (i < klen ? k[i] : 0) ^ HMAC_IPAD;
142: opad[i] = (i < klen ? k[i] : 0) ^ HMAC_OPAD;
143: }
1.1 sjg 144:
1.3 christos 145: p = dlen >= h->digsize ? digest : d;
146: if (p != digest) {
147: memcpy(p, digest, dlen);
148: memset((char *)p + dlen, 0, h->digsize - dlen);
149: }
150: (*h->init)(c);
151: (*h->update)(c, ipad, h->blocksize);
152: (*h->update)(c, text, (unsigned int)tlen);
153: (*h->final)(p, c);
154:
155: (*h->init)(c);
1.4 ! christos 156: (*h->update)(c, opad, (unsigned int)h->blocksize);
1.3 christos 157: (*h->update)(c, digest, (unsigned int)h->digsize);
158: (*h->final)(p, c);
159:
160: if (p != digest)
161: memcpy(digest, p, dlen);
162:
163: return h->digsize;
1.1 sjg 164: }
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