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
|
/*
This file is part of GNUnet.
(C) 2011, 2012 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
package org.gnunet.util;
import org.gnunet.construct.FixedSizeIntegerArray;
import org.gnunet.construct.Message;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
/**
* 512-bit hash code
*/
public class HashCode implements Message {
@FixedSizeIntegerArray(length = 64, signed = false, bitSize = 8)
public byte[] data; // should be immutable, final, can't be due to construct
public HashCode() {
// construct needs a default c'tor
}
public HashCode(byte[] hash) {
if (hash.length != 64) {
throw new AssertionError("HashCode has to have length 64");
}
data = Arrays.copyOf(hash, hash.length);
}
/**
* Create a HashCode of the String using SHA-512
* @param s the string to hash
*/
public HashCode(String s) {
MessageDigest digest;
try {
digest = MessageDigest.getInstance("SHA-512");
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("crypto algorithm required but not provided");
}
byte[] data = digest.digest(s.getBytes());
if (data.length != 64) {
throw new RuntimeException("error in SHA512 algorithm");
}
this.data = data;
}
}
|