| // Copyright 2017 Google Inc. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| package com.google.crypto.tink.subtle; |
| |
| import static org.junit.Assert.assertArrayEquals; |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertTrue; |
| |
| import java.util.Arrays; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| |
| /** Unit tests for Ed25519. */ |
| @RunWith(JUnit4.class) |
| public class Ed25519Test { |
| @Test |
| public void testGroupOrder() throws Exception { |
| assertEquals(32, Ed25519.GROUP_ORDER.length); |
| byte[] result = Ed25519.scalarMultWithBaseToBytes(Ed25519.GROUP_ORDER); |
| assertEquals(1, result[0]); |
| for (int i = 1; i < 32; i++) { |
| assertEquals(0, result[i]); |
| } |
| } |
| |
| /** Test whether sign/verify method accidentally changes the public key or hashedPrivateKey. */ |
| @Test |
| public void testUnmodifiedKey() throws Exception { |
| byte[] privateKey = Random.randBytes(Field25519.FIELD_LEN); |
| byte[] hashedPrivateKey = Ed25519.getHashedScalar(privateKey); |
| byte[] originalHashedPrivateKey = |
| Arrays.copyOfRange(hashedPrivateKey, 0, hashedPrivateKey.length); |
| byte[] publicKey = Ed25519.scalarMultWithBaseToBytes(hashedPrivateKey); |
| byte[] originalPublicKey = Arrays.copyOfRange(publicKey, 0, publicKey.length); |
| for (int i = 0; i < 64; i++) { |
| byte[] msg = Random.randBytes(1024); |
| byte[] sig = Ed25519.sign(msg, publicKey, hashedPrivateKey); |
| assertTrue(Ed25519.verify(msg, sig, publicKey)); |
| assertArrayEquals(originalHashedPrivateKey, hashedPrivateKey); |
| assertArrayEquals(originalPublicKey, publicKey); |
| } |
| } |
| |
| /** Test for https://github.com/google/tink/issues/224. */ |
| @Test |
| public void testScalarMultWithBase() throws Exception { |
| byte[] scalar = Hex.decode("521784c403e6fb32d48e0da85969a82f5952856bde4471a42b3fa56fd8b96c0d"); |
| Ed25519.scalarMultWithBaseToBytes(scalar); |
| } |
| } |