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/*
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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
package org.gnunet.util.crypto;
import org.gnunet.construct.FixedSizeIntegerArray;
import org.gnunet.construct.Message;
import org.gnunet.util.Strings;
import java.security.SecureRandom;
import java.util.Arrays;
/**
* EdDSA public key.
*/
public class EddsaPublicKey implements Message {
/**
* y-coordinate of the point on the curve, in Ed25519-compressed form.
* The number is stored as little endian.
*/
@FixedSizeIntegerArray(bitSize = 8, signed = false, length = 32)
public byte[] y;
/**
* Create a public key without allocating space for the key data.
* Necessary for constructing this class with org.gnunet.construct.*
*/
public EddsaPublicKey() {
// default constructor for Construct
}
public EddsaPublicKey(Ed25519 a) {
y = a.encode();
}
/**
* Convert this public key to a point on the Ed25519 curve.
*
* @return a point corresponding to this key
*/
Ed25519 asPoint() {
return Ed25519.decode(y);
}
/**
* Load an ECDSA 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;
}
/**
* Create a random public key. The generated key might not even be valid
* (i.e. not on the curve), thus this method should only be used for testing.
*
* @return a random, possibly invalid public key
*/
public static EcdsaPublicKey random() {
SecureRandom sr = new SecureRandom();
EcdsaPublicKey publicKey = new EcdsaPublicKey();
sr.nextBytes(publicKey.y);
return publicKey;
}
/**
* Converrt this public key to a string
*
* @return a string representing this public key
*/
@Override
public String toString() {
return Strings.dataToString(y);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
EcdsaPublicKey publicKey = (EcdsaPublicKey) o;
if (!Arrays.equals(y, publicKey.y)) return false;
return true;
}
@Override
public int hashCode() {
int result = Arrays.hashCode(y);
return result;
}
}
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