1 /*
2 *
3 * Copyright 1998 Sun Microsystems, Inc. All rights reserved.
4 * Use is subject to license terms.
5 *
6 *
7 * Comments:
8 *
9 */
10
11 #pragma ident "%Z%%M% %I% %E% SMI"
12
13 #include <sys/types.h>
14 #include <strings.h>
15 #include "sec.h"
16
17 /* text is the challenge, key is the password, digest is an allocated
18 buffer (min 16 chars) which will contain the resulting digest */
hmac_md5(unsigned char * text,int text_len,unsigned char * key,int key_len,unsigned char * digest)19 void hmac_md5(unsigned char *text, int text_len, unsigned char *key,
20 int key_len, unsigned char *digest)
21 {
22 MD5_CTX context;
23 unsigned char k_ipad[65];
24 unsigned char k_opad[65];
25 unsigned char tk[16];
26 int i;
27
28 if (key_len > 64){
29 MD5_CTX tctx;
30
31 (void) MD5Init(&tctx);
32 (void) MD5Update(&tctx, key, key_len);
33 (void) MD5Final(tk, &tctx);
34 key = tk;
35 key_len = 16;
36 }
37
38 bzero(k_ipad, sizeof (k_ipad));
39 bzero(k_opad, sizeof (k_opad));
40 bcopy(key, k_ipad, key_len);
41 bcopy(key, k_opad, key_len);
42
43 for (i=0; i<64; i++){
44 k_ipad[i] ^= 0x36;
45 k_opad[i] ^= 0x5c;
46 }
47
48 /* Perform inner MD5 */
49 (void) MD5Init(&context);
50 (void) MD5Update(&context, k_ipad, 64);
51 (void) MD5Update(&context, text, text_len);
52 (void) MD5Final(digest, &context);
53
54 /* Perform outer MD5 */
55 (void) MD5Init(&context);
56 (void) MD5Update(&context, k_opad, 64);
57 (void) MD5Update(&context, digest, 16);
58
59 (void) MD5Final(digest, &context);
60
61 return;
62 }
63