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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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
package org.gnunet.util;
import org.gnunet.util.crypto.Ed25519;
import org.junit.Assert;
import org.junit.Test;
import java.math.BigInteger;
import java.util.Random;
public class Ed25519Test {
/**
* Simple test for commutativity.
*/
@Test
public void test_commutative() {
Ed25519 p1 = Ed25519.B.scalarmult(BigInteger.valueOf(42)).scalarmult(BigInteger.valueOf(100));
Ed25519 p2 = Ed25519.B.scalarmult(BigInteger.valueOf(100)).scalarmult(BigInteger.valueOf(42));
byte[] data1 = p1.encode();
byte[] data2 = p2.encode();
Assert.assertArrayEquals(data1, data2);
}
/**
* Raw ECDH check.
*/
@Test
public void test_ecdh() {
for (int i = 0; i < 5; ++i) {
System.out.println("try " + i);
byte[] d1 = new byte[32];
byte[] d2 = new byte[32];
Random r = new Random();
r.nextBytes(d1);
r.nextBytes(d2);
d1[0] &= 248;
d1[31] &= 127;
d1[31] |= 64;
d2[0] &= 248;
d2[31] &= 127;
d2[31] |= 64;
Ed25519 pk1 = Ed25519.B.scalarmult(Ed25519.decodeScalar(d1));
Ed25519 pk2 = Ed25519.B.scalarmult(Ed25519.decodeScalar(d2));
byte[] pk1Data = pk1.encode();
byte[] pk2Data = pk2.encode();
Assert.assertEquals(pk1, Ed25519.decode(pk1Data));
Assert.assertEquals(pk2, Ed25519.decode(pk2Data));
byte[] data1 = Ed25519.decode(pk1Data).scalarmult(Ed25519.decodeScalar(d2)).encode();
byte[] data2 = Ed25519.decode(pk2Data).scalarmult(Ed25519.decodeScalar(d1)).encode();
/*
Ed25519 p1 = Ed25519.B.scalarmult(Ed25519.decodeScalar(d1)).scalarmult(Ed25519.decodeScalar(d2));
Ed25519 p2 = Ed25519.B.scalarmult(Ed25519.decodeScalar(d2)).scalarmult(Ed25519.decodeScalar(d1));
byte[] data1 = p1.encode();
byte[] data2 = p2.encode();
*/
Assert.assertArrayEquals(data1, data2);
}
}
/**
* Test if decode is the inverse of encode.
*/
@Test
public void test_encode_inverse() {
Random r = new Random();
for (int i = 0; i < 5; i++) {
byte[] d1 = new byte[32];
r.nextBytes(d1);
d1[31] &= 127;
Ed25519 p1 = Ed25519.B.scalarmult(Ed25519.decodeScalar(d1));
// encode and decode the same value!
byte[] data1 = p1.encode();
Ed25519 p2 = Ed25519.decode(data1);
Assert.assertEquals(p1, p2);
Assert.assertArrayEquals(p1.encode(), p2.encode());
}
}
@Test
public void test_encode_inverse_simple() {
Ed25519 p1 = Ed25519.B;
// encode and decode the same value!
byte[] data1 = p1.encode();
for (int i = 0; i < 32; i++) {
System.out.print(data1[i] + " ");
}
System.out.println();
Ed25519 p2 = Ed25519.decode(data1);
Assert.assertArrayEquals(p1.encode(), p2.encode());
Assert.assertEquals(p1, p2);
}
/**
*
*/
@Test
public void test_encode_scalar() {
Random r = new Random();
for (int i = 0; i < 10; i++) {
byte[] d1 = new byte[32];
r.nextBytes(d1);
d1[31] &= 127;
BigInteger s1 = Ed25519.decodeScalar(d1);
byte[] d2 = Ed25519.encodeScalar(s1);
BigInteger s2 = Ed25519.decodeScalar(d2);
Assert.assertEquals(s1, s2);
Assert.assertArrayEquals(d1, d2);
}
}
@Test
public void test_order() {
Ed25519 P = Ed25519.B.scalarmult(Ed25519.l);
System.out.println("Point P: " + P);
Assert.assertTrue(P.isIdentity());
}
}
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