Annotation of embedaddon/axTLS/crypto/hmac.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (c) 2007, Cameron Rich
3: *
4: * All rights reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions are met:
8: *
9: * * Redistributions of source code must retain the above copyright notice,
10: * this list of conditions and the following disclaimer.
11: * * Redistributions in binary form must reproduce the above copyright notice,
12: * this list of conditions and the following disclaimer in the documentation
13: * and/or other materials provided with the distribution.
14: * * Neither the name of the axTLS project nor the names of its contributors
15: * may be used to endorse or promote products derived from this software
16: * without specific prior written permission.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
22: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
25: * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26: * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27: * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28: * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29: */
30:
31: /**
32: * HMAC implementation - This code was originally taken from RFC2104
33: * See http://www.ietf.org/rfc/rfc2104.txt and
34: * http://www.faqs.org/rfcs/rfc2202.html
35: */
36:
37: #include <string.h>
38: #include "os_port.h"
39: #include "crypto.h"
40:
41: /**
42: * Perform HMAC-MD5
43: * NOTE: does not handle keys larger than the block size.
44: */
45: void hmac_md5(const uint8_t *msg, int length, const uint8_t *key,
46: int key_len, uint8_t *digest)
47: {
48: MD5_CTX context;
49: uint8_t k_ipad[64];
50: uint8_t k_opad[64];
51: int i;
52:
53: memset(k_ipad, 0, sizeof k_ipad);
54: memset(k_opad, 0, sizeof k_opad);
55: memcpy(k_ipad, key, key_len);
56: memcpy(k_opad, key, key_len);
57:
58: for (i = 0; i < 64; i++)
59: {
60: k_ipad[i] ^= 0x36;
61: k_opad[i] ^= 0x5c;
62: }
63:
64: MD5_Init(&context);
65: MD5_Update(&context, k_ipad, 64);
66: MD5_Update(&context, msg, length);
67: MD5_Final(digest, &context);
68: MD5_Init(&context);
69: MD5_Update(&context, k_opad, 64);
70: MD5_Update(&context, digest, MD5_SIZE);
71: MD5_Final(digest, &context);
72: }
73:
74: /**
75: * Perform HMAC-SHA1
76: * NOTE: does not handle keys larger than the block size.
77: */
78: void hmac_sha1(const uint8_t *msg, int length, const uint8_t *key,
79: int key_len, uint8_t *digest)
80: {
81: SHA1_CTX context;
82: uint8_t k_ipad[64];
83: uint8_t k_opad[64];
84: int i;
85:
86: memset(k_ipad, 0, sizeof k_ipad);
87: memset(k_opad, 0, sizeof k_opad);
88: memcpy(k_ipad, key, key_len);
89: memcpy(k_opad, key, key_len);
90:
91: for (i = 0; i < 64; i++)
92: {
93: k_ipad[i] ^= 0x36;
94: k_opad[i] ^= 0x5c;
95: }
96:
97: SHA1_Init(&context);
98: SHA1_Update(&context, k_ipad, 64);
99: SHA1_Update(&context, msg, length);
100: SHA1_Final(digest, &context);
101: SHA1_Init(&context);
102: SHA1_Update(&context, k_opad, 64);
103: SHA1_Update(&context, digest, SHA1_SIZE);
104: SHA1_Final(digest, &context);
105: }
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