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/*
* Copyright (c) 2014, 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 8014374
* @summary Ensure that same key+iv can't be repeatedly used for encryption.
* @author Valerie Peng
*/
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.math.*;
import java.util.*;
public class TestGCMKeyAndIvCheck extends UcryptoTest {
private static final byte[] AAD = new byte[5];
private static final byte[] PT = new byte[33];
private static void checkISE(Cipher c) throws Exception {
// Subsequent encryptions should fail
try {
c.updateAAD(AAD);
throw new Exception("Should throw ISE for updateAAD()");
} catch (IllegalStateException ise) {
// expected
}
try {
c.update(PT);
throw new Exception("Should throw ISE for update()");
} catch (IllegalStateException ise) {
// expected
}
try {
c.doFinal(PT);
throw new Exception("Should throw ISE for doFinal()");
} catch (IllegalStateException ise) {
// expected
}
}
public static void main(String[] args) throws Exception {
main(new TestGCMKeyAndIvCheck(), null);
}
public void doTest(Provider p) throws Exception {
Cipher c;
try {
c = Cipher.getInstance("AES/GCM/NoPadding", p);
} catch (NoSuchAlgorithmException nsae) {
System.out.println("Skipping Test due to No GCM support");
return;
}
SecretKey key = new SecretKeySpec(new byte[16], "AES");
// First try parameter-less init.
c.init(Cipher.ENCRYPT_MODE, key);
c.updateAAD(AAD);
byte[] ctPlusTag = c.doFinal(PT);
// subsequent encryption should fail unless re-init w/ different key+iv
checkISE(c);
// Validate the retrieved parameters against the IV and tag length.
AlgorithmParameters params = c.getParameters();
if (params == null) {
throw new Exception("getParameters() should not return null");
}
GCMParameterSpec spec = params.getParameterSpec(GCMParameterSpec.class);
if (spec.getTLen() != (ctPlusTag.length - PT.length)*8) {
throw new Exception("Parameters contains incorrect TLen value");
}
if (!Arrays.equals(spec.getIV(), c.getIV())) {
throw new Exception("Parameters contains incorrect IV value");
}
// Should be ok to use the same key+iv for decryption
c.init(Cipher.DECRYPT_MODE, key, params);
c.updateAAD(AAD);
byte[] recovered = c.doFinal(ctPlusTag);
if (!Arrays.equals(recovered, PT)) {
throw new Exception("decryption result mismatch");
}
// Now try to encrypt again using the same key+iv; should fail also
try {
c.init(Cipher.ENCRYPT_MODE, key, params);
throw new Exception("Should throw exception when same key+iv is used");
} catch (InvalidAlgorithmParameterException iape) {
// expected
}
// Now try to encrypt again using parameter-less init; should work
c.init(Cipher.ENCRYPT_MODE, key);
c.doFinal(PT);
// make sure a different iv is used
byte[] iv = c.getIV();
if (Arrays.equals(spec.getIV(), iv)) {
throw new Exception("IV should be different now");
}
// Now try to encrypt again using a different parameter; should work
byte[] rdm_iv = new byte[30];
Random rdm = new Random();
rdm.nextBytes(rdm_iv);
c.init(Cipher.ENCRYPT_MODE, key, new GCMParameterSpec(128, rdm_iv));
c.updateAAD(AAD);
c.doFinal(PT);
// subsequent encryption should fail unless re-init w/ different key+iv
checkISE(c);
// Now try decryption twice in a row; no re-init required and
// same parameters is used.
c.init(Cipher.DECRYPT_MODE, key, params);
c.updateAAD(AAD);
recovered = c.doFinal(ctPlusTag);
c.updateAAD(AAD);
recovered = c.doFinal(ctPlusTag);
if (!Arrays.equals(recovered, PT)) {
throw new Exception("decryption result mismatch");
}
// Now try decryption again and re-init using the same parameters
c.init(Cipher.DECRYPT_MODE, key, params);
c.updateAAD(AAD);
recovered = c.doFinal(ctPlusTag);
// init to decrypt w/o parameters; should fail with IKE as
// javadoc specified
try {
c.init(Cipher.DECRYPT_MODE, key);
throw new Exception("Should throw IKE for dec w/o params");
} catch (InvalidKeyException ike) {
// expected
}
// Lastly, try encryption AND decryption w/ wrong type of parameters,
// e.g. IvParameterSpec
try {
c.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(iv));
throw new Exception("Should throw IAPE");
} catch (InvalidAlgorithmParameterException iape) {
// expected
}
try {
c.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));
throw new Exception("Should throw IAPE");
} catch (InvalidAlgorithmParameterException iape) {
// expected
}
System.out.println("Test Passed!");
}
}
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