/**
* Copyright 2013 Jim Burton.
*
* Licensed under the MIT license (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://opensource.org/licenses/mit-license.php
*
* 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.devcoin.crypto;
import com.google.devcoin.core.Utils;
import com.google.devcoin.utils.BriefLogFormatter;
import com.google.protobuf.ByteString;
import org.devcoinj.wallet.Protos;
import org.devcoinj.wallet.Protos.ScryptParameters;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.UnsupportedEncodingException;
import java.security.SecureRandom;
import java.util.Random;
import java.util.UUID;
import static org.junit.Assert.*;
public class KeyCrypterScryptTest {
private static final Logger log = LoggerFactory.getLogger(KeyCrypterScryptTest.class);
// Nonsense bytes for encryption test.
private static final byte[] TEST_BYTES1 = {0, -101, 2, 103, -4, 105, 6, 107, 8, -109, 10, 111, -12, 113, 14, -115, 16, 117, -18, 119, 20, 121, 22, 123, -24, 125, 26, 127, -28, 29, -30, 31};
private static final CharSequence PASSWORD1 = "aTestPassword";
private static final CharSequence PASSWORD2 = "0123456789";
private static final CharSequence WRONG_PASSWORD = "thisIsTheWrongPassword";
private ScryptParameters scryptParameters;
@Before
public void setUp() throws Exception {
byte[] salt = new byte[KeyCrypterScrypt.SALT_LENGTH];
new SecureRandom().nextBytes(salt);
Protos.ScryptParameters.Builder scryptParametersBuilder = Protos.ScryptParameters.newBuilder().setSalt(ByteString.copyFrom(salt));
scryptParameters = scryptParametersBuilder.build();
BriefLogFormatter.init();
}
@Test
public void testKeyCrypterGood1() throws KeyCrypterException {
KeyCrypterScrypt keyCrypter = new KeyCrypterScrypt(scryptParameters);
// Encrypt.
EncryptedPrivateKey encryptedPrivateKey = keyCrypter.encrypt(TEST_BYTES1, keyCrypter.deriveKey(PASSWORD1));
assertNotNull(encryptedPrivateKey);
// Decrypt.
byte[] reborn = keyCrypter.decrypt(encryptedPrivateKey, keyCrypter.deriveKey(PASSWORD1));
log.debug("Original: " + Utils.bytesToHexString(TEST_BYTES1));
log.debug("Reborn : " + Utils.bytesToHexString(reborn));
assertEquals(Utils.bytesToHexString(TEST_BYTES1), Utils.bytesToHexString(reborn));
}
/**
* Test with random plain text strings and random passwords.
* UUIDs are used and hence will only cover hex characters (and the separator hyphen).
* @throws KeyCrypterException
* @throws UnsupportedEncodingException
*/
@Test
public void testKeyCrypterGood2() throws Exception {
KeyCrypterScrypt keyCrypter = new KeyCrypterScrypt(scryptParameters);
System.out.print("EncrypterDecrypterTest: Trying random UUIDs for plainText and passwords :");
int numberOfTests = 16;
for (int i = 0; i < numberOfTests; i++) {
// Create a UUID as the plaintext and use another for the password.
String plainText = UUID.randomUUID().toString();
CharSequence password = UUID.randomUUID().toString();
EncryptedPrivateKey encryptedPrivateKey = keyCrypter.encrypt(plainText.getBytes(), keyCrypter.deriveKey(password));
assertNotNull(encryptedPrivateKey);
byte[] reconstructedPlainBytes = keyCrypter.decrypt(encryptedPrivateKey,keyCrypter.deriveKey(password));
assertEquals(Utils.bytesToHexString(plainText.getBytes()), Utils.bytesToHexString(reconstructedPlainBytes));
System.out.print('.');
}
System.out.println(" Done.");
}
@Test
public void testKeyCrypterWrongPassword() throws KeyCrypterException {
KeyCrypterScrypt keyCrypter = new KeyCrypterScrypt(scryptParameters);
// create a longer encryption string
StringBuilder stringBuffer = new StringBuilder();
for (int i = 0; i < 100; i++) {
stringBuffer.append(i).append(" ").append("The quick brown fox");
}
EncryptedPrivateKey encryptedPrivateKey = keyCrypter.encrypt(stringBuffer.toString().getBytes(), keyCrypter.deriveKey(PASSWORD2));
assertNotNull(encryptedPrivateKey);
try {
keyCrypter.decrypt(encryptedPrivateKey, keyCrypter.deriveKey(WRONG_PASSWORD));
// TODO: This test sometimes fails due to relying on padding.
fail("Decrypt with wrong password did not throw exception");
} catch (KeyCrypterException ede) {
assertTrue(ede.getMessage().contains("Could not decrypt"));
}
}
@Test
public void testEncryptDecryptBytes1() throws KeyCrypterException {
KeyCrypterScrypt keyCrypter = new KeyCrypterScrypt(scryptParameters);
// Encrypt bytes.
EncryptedPrivateKey encryptedPrivateKey = keyCrypter.encrypt(TEST_BYTES1, keyCrypter.deriveKey(PASSWORD1));
assertNotNull(encryptedPrivateKey);
log.debug("\nEncrypterDecrypterTest: cipherBytes = \nlength = " + encryptedPrivateKey.getEncryptedBytes().length + "\n---------------\n" + Utils.bytesToHexString(encryptedPrivateKey.getEncryptedBytes()) + "\n---------------\n");
byte[] rebornPlainBytes = keyCrypter.decrypt(encryptedPrivateKey, keyCrypter.deriveKey(PASSWORD1));
log.debug("Original: " + Utils.bytesToHexString(TEST_BYTES1));
log.debug("Reborn1 : " + Utils.bytesToHexString(rebornPlainBytes));
assertEquals(Utils.bytesToHexString(TEST_BYTES1), Utils.bytesToHexString(rebornPlainBytes));
}
@Test
public void testEncryptDecryptBytes2() throws KeyCrypterException {
KeyCrypterScrypt keyCrypter = new KeyCrypterScrypt(scryptParameters);
// Encrypt random bytes of various lengths up to length 50.
Random random = new Random();
for (int i = 0; i < 50; i++) {
byte[] plainBytes = new byte[i];
random.nextBytes(plainBytes);
EncryptedPrivateKey encryptedPrivateKey = keyCrypter.encrypt(plainBytes, keyCrypter.deriveKey(PASSWORD1));
assertNotNull(encryptedPrivateKey);
//log.debug("\nEncrypterDecrypterTest: cipherBytes = \nlength = " + cipherBytes.length + "\n---------------\n" + Utils.bytesToHexString(cipherBytes) + "\n---------------\n");
byte[] rebornPlainBytes = keyCrypter.decrypt(encryptedPrivateKey, keyCrypter.deriveKey(PASSWORD1));
log.debug("Original: (" + i + ") " + Utils.bytesToHexString(plainBytes));
log.debug("Reborn1 : (" + i + ") " + Utils.bytesToHexString(rebornPlainBytes));
assertEquals(Utils.bytesToHexString(plainBytes), Utils.bytesToHexString(rebornPlainBytes));
}
}
}