-
Notifications
You must be signed in to change notification settings - Fork 25
Expand file tree
/
Copy pathHMACT64.java
More file actions
95 lines (77 loc) · 2.14 KB
/
Copy pathHMACT64.java
File metadata and controls
95 lines (77 loc) · 2.14 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
package javaforce;
import java.security.MessageDigest;
/**
* HMACT64 MessageDigest.
*/
public class HMACT64 extends MessageDigest implements Cloneable {
private static final int BLOCK_LENGTH = 64;
private static final byte IPAD = (byte) 0x36;
private static final byte OPAD = (byte) 0x5c;
private MessageDigest md5;
private byte[] ipad = new byte[BLOCK_LENGTH];
private byte[] opad = new byte[BLOCK_LENGTH];
/**
* Creates an HMACT64 instance which uses the given secret key material.
*
* @param key The key material to use in hashing.
*/
public HMACT64(byte[] key) {
super("HMACT64");
int length = Math.min(key.length, BLOCK_LENGTH);
for (int i = 0; i < length; i++) {
ipad[i] = (byte) (key[i] ^ IPAD);
opad[i] = (byte) (key[i] ^ OPAD);
}
for (int i = length; i < BLOCK_LENGTH; i++) {
ipad[i] = IPAD;
opad[i] = OPAD;
}
try {
md5 = MessageDigest.getInstance("MD5");
} catch (Exception ex) {
throw new IllegalStateException(ex.getMessage());
}
engineReset();
}
private HMACT64(HMACT64 hmac) throws CloneNotSupportedException {
super("HMACT64");
this.ipad = hmac.ipad;
this.opad = hmac.opad;
this.md5 = (MessageDigest) hmac.md5.clone();
}
public Object clone() {
try {
return new HMACT64(this);
} catch (CloneNotSupportedException ex) {
throw new IllegalStateException(ex.getMessage());
}
}
protected byte[] engineDigest() {
byte[] digest = md5.digest();
md5.update(opad);
return md5.digest(digest);
}
protected int engineDigest(byte[] buf, int offset, int len) {
byte[] digest = md5.digest();
md5.update(opad);
md5.update(digest);
try {
return md5.digest(buf, offset, len);
} catch (Exception ex) {
throw new IllegalStateException();
}
}
protected int engineGetDigestLength() {
return md5.getDigestLength();
}
protected void engineReset() {
md5.reset();
md5.update(ipad);
}
protected void engineUpdate(byte b) {
md5.update(b);
}
protected void engineUpdate(byte[] input, int offset, int len) {
md5.update(input, offset, len);
}
}