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/**
* @license
* Copyright 2016 Google Inc. All rights reserved.
* 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.security.wycheproof;
import com.google.security.wycheproof.WycheproofRunner.ProviderType;
import com.google.security.wycheproof.WycheproofRunner.SlowTest;
import java.math.BigInteger;
import java.security.GeneralSecurityException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.util.Arrays;
import javax.crypto.Cipher;
import javax.crypto.spec.DHParameterSpec;
import junit.framework.TestCase;
/**
* Testing DHIES.
*
* @author bleichen@google.com (Daniel Bleichenbacher)
*/
// TODO(bleichen):
// - maybe again CipherInputStream, CipherOutputStream,
// - byteBuffer.
// - Exception handling
// - Is DHIES using the key derivation function for the key stream?
// - BouncyCastle knows an algorithm IES. Is this the same as DHIES?
// - Bouncy fixed a padding oracle bug in version 1.56 (CVE-2016-1000345)
// So far we have no test for this bug mainly because this cannot be tested
// through the JCA interface. BC does not register and algorithm such as
// Cipher.DHIESWITHAES-CBC.
// - So far only BouncyCastles is tesed because this is the only provider
// we use that implements DHIES.
public class DhiesTest extends TestCase {
// TODO(bleichen): This is the same as DhTest.java
// We could move this into some TestUtil.
public DHParameterSpec ike2048() {
final BigInteger p =
new BigInteger(
"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1"
+ "29024E088A67CC74020BBEA63B139B22514A08798E3404DD"
+ "EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245"
+ "E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED"
+ "EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D"
+ "C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F"
+ "83655D23DCA3AD961C62F356208552BB9ED529077096966D"
+ "670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B"
+ "E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9"
+ "DE2BCBF6955817183995497CEA956AE515D2261898FA0510"
+ "15728E5A8AACAA68FFFFFFFFFFFFFFFF",
16);
final BigInteger g = new BigInteger("2");
return new DHParameterSpec(p, g);
}
/**
* WARNING: This test uses weak crypto (i.e. DHIESWithAES). Checks that key agreement using DHIES
* works in the sense that it can decrypt what it encrypts. Unfortunately it seems that there is
* no secure mode using AES.
*/
@SuppressWarnings("InsecureCipherMode")
public void testDhiesBasic() throws Exception {
DHParameterSpec params = ike2048();
KeyPairGenerator kf = KeyPairGenerator.getInstance("DH");
kf.initialize(params);
KeyPair keyPair = kf.generateKeyPair();
PrivateKey priv = keyPair.getPrivate();
PublicKey pub = keyPair.getPublic();
byte[] message = "Hello".getBytes("UTF-8");
Cipher dhies = Cipher.getInstance("DHIESwithAES");
dhies.init(Cipher.ENCRYPT_MODE, pub);
byte[] ciphertext = dhies.doFinal(message);
System.out.println("testDhiesBasic:" + TestUtil.bytesToHex(ciphertext));
dhies.init(Cipher.DECRYPT_MODE, priv);
byte[] decrypted = dhies.doFinal(ciphertext);
assertEquals(TestUtil.bytesToHex(message), TestUtil.bytesToHex(decrypted));
}
/**
* WARNING: This test uses weak crypto (i.e. DHIESWithAES). DHIES should be secure against chosen
* ciphertexts. Checks that a modification of the ciphertext is dectected.
*/
@SlowTest(providers = {ProviderType.BOUNCY_CASTLE, ProviderType.SPONGY_CASTLE})
@SuppressWarnings("InsecureCipherMode")
public void testDhiesCorrupt() throws Exception {
KeyPairGenerator kf = KeyPairGenerator.getInstance("DH");
kf.initialize(ike2048());
KeyPair keyPair = kf.generateKeyPair();
PrivateKey priv = keyPair.getPrivate();
PublicKey pub = keyPair.getPublic();
byte[] message = new byte[32];
Cipher dhies = Cipher.getInstance("DHIESwithAES");
dhies.init(Cipher.ENCRYPT_MODE, pub);
byte[] ciphertext = dhies.doFinal(message);
for (int i = 0; i < ciphertext.length; i++) {
byte[] corrupt = Arrays.copyOf(ciphertext, ciphertext.length);
corrupt[i] ^= (byte) 1;
try {
dhies.init(Cipher.DECRYPT_MODE, priv);
dhies.doFinal(corrupt);
fail("Corrupt ciphertext accepted:" + i);
} catch (GeneralSecurityException ex) {
// This is expected
}
}
}
/**
* Tries to detect if an algorithm is using ECB. Unfortunately, many JCE algorithms use ECB if no
* encryption mode is specified.
*/
@SuppressWarnings("InsecureCipherMode")
public void testNotEcb(String algorithm) throws Exception {
Cipher dhies;
try {
dhies = Cipher.getInstance(algorithm);
} catch (NoSuchAlgorithmException ex) {
// This test is called with short algorithm names such as just "DHIES".
// Requiring full names is typically a good practice. Hence it is OK
// to not assigning default algorithms.
System.out.println("No implementation for:" + algorithm);
return;
}
KeyPairGenerator kf = KeyPairGenerator.getInstance("DH");
kf.initialize(ike2048());
KeyPair keyPair = kf.generateKeyPair();
PublicKey pub = keyPair.getPublic();
byte[] message = new byte[512];
dhies.init(Cipher.ENCRYPT_MODE, pub);
byte[] ciphertext = dhies.doFinal(message);
for (int i = 0; i + 32 <= ciphertext.length; i++) {
String block1 = TestUtil.bytesToHex(Arrays.copyOfRange(ciphertext, i, i + 16));
String block2 = TestUtil.bytesToHex(Arrays.copyOfRange(ciphertext, i + 16, i + 32));
assertTrue(
"Ciphertext repeats at " + i + ":" + TestUtil.bytesToHex(ciphertext),
!block1.equals(block2));
}
}
public void testSemanticSecurityDhies() throws Exception {
testNotEcb("DHIES");
}
}
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