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/*
* Copyright (c) 2022, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8281628
* @library /test/lib
* @summary ensure padding bytes are always added when generated secret
* is smaller than buffer size.
*/
import javax.crypto.KeyAgreement;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.util.Arrays;
import java.util.HexFormat;
import jdk.test.lib.security.SecurityUtils;
public class DHKeyAgreementPadding {
public static void main(String[] args) throws Exception {
String kpgAlgorithm = "DiffieHellman";
KeyAgreement alice = KeyAgreement.getInstance(kpgAlgorithm);
KeyAgreement bob = KeyAgreement.getInstance(kpgAlgorithm);
int keySizeBits = SecurityUtils.getTestKeySize(kpgAlgorithm);
byte[] aliceSecret = new byte[keySizeBits / 8];
byte[] bobSecret = new byte[keySizeBits / 8];
// The probability of an error is 0.2% or 1/500. Try more times.
for (int i = 0; i < 5000; i++) {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(kpgAlgorithm);
keyPairGen.initialize(keySizeBits);
KeyPair aliceKeyPair = keyPairGen.generateKeyPair();
KeyPair bobKeyPair = keyPairGen.generateKeyPair();
// Different stale data
Arrays.fill(aliceSecret, (byte)'a');
Arrays.fill(bobSecret, (byte)'b');
alice.init(aliceKeyPair.getPrivate());
alice.doPhase(bobKeyPair.getPublic(), true);
int aliceLen = alice.generateSecret(aliceSecret, 0);
bob.init(bobKeyPair.getPrivate());
bob.doPhase(aliceKeyPair.getPublic(), true);
int bobLen = bob.generateSecret(bobSecret, 0);
if (!Arrays.equals(aliceSecret, 0, aliceLen, bobSecret, 0, bobLen)) {
System.out.println(HexFormat.ofDelimiter(":").formatHex(aliceSecret, 0, aliceLen));
System.out.println(HexFormat.ofDelimiter(":").formatHex(bobSecret, 0, bobLen));
throw new RuntimeException("Different secrets observed at runs #" + i);
}
}
}
}
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