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
|
/*
This file is part of GNUnet.
Copyright (C) 2012, 2013 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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
package org.gnunet.util.crypto;
import org.gnunet.construct.FixedSizeIntegerArray;
import org.gnunet.util.Strings;
/**
* Public key for elliptic curve diffie hellman exchange.
*/
public class EcdhePublicKey {
/**
* Point on the curve, in Ed25519-compressed form.
*/
@FixedSizeIntegerArray(bitSize = 8, signed = false, length = 32)
public byte[] y;
/**
* Create a public key without allocating the key's data.
* Necessary for constructing the key with 'org.gnunet.construct.*'.
*/
public EcdhePublicKey() {
// empty
}
/**
* Create a public key from the given point on the Ed25519 curve.
*
* @param a point to create the public key from
*/
public EcdhePublicKey(Ed25519 a) {
y = a.encode();
}
/**
* Convert the public key to a point on the Ed25519 curve.
*
* @return point corresponding to this public key
*/
public Ed25519 asPoint() {
return Ed25519.decode(y);
}
/**
* Get a GNUnet-style string representation of this key.
*
* @return the GNUnet-style string representation of this key.
*/
@Override
public String toString() {
return Strings.dataToString(y);
}
/**
* Load an ECDHE key from a string.
*
* @param s string with the key data
* @return a public key
*/
public EcdhePublicKey fromString(String s) {
EcdhePublicKey publicKey = new EcdhePublicKey();
Strings.stringToData(s, publicKey.y);
return publicKey;
}
}
|