/*
* Copyright (c) 2015, 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
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*/
import static java.lang.System.out;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.AlgorithmParameterSpec;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.SecretKey;
import javax.crypto.ShortBufferException;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
/**
* Wrapper class to test a given DES algorithm.
*/
public class DESCipherWrapper {
private final Cipher ci;
private final byte[] iv;
private final SecretKey key;
private final String algo;
private final String mode;
private final String pad;
private final int keyStrength;
private byte[] resultText = null;
public DESCipherWrapper(String algo, String mode, String pad)
throws NoSuchAlgorithmException, NoSuchPaddingException {
ci = Cipher.getInstance(algo + "/" + mode + "/" + pad);
iv = new byte[8];
for (int i = 0; i < 8; i++) {
iv[i] = (byte) (i & 0xff);
}
KeyGenerator kg = KeyGenerator.getInstance(algo);
key = kg.generateKey();
keyStrength = algo.equalsIgnoreCase("DESede") ? 112
: key.getEncoded().length * 8;
this.algo = algo;
this.mode = mode;
this.pad = pad;
}
public byte[] getResult() {
return resultText.clone();
}
public void execute(int edMode, byte[] inputText)
throws InvalidKeyException, InvalidAlgorithmParameterException,
IllegalBlockSizeException, BadPaddingException,
ShortBufferException, NoSuchAlgorithmException {
AlgorithmParameterSpec aps = null;
try {
if (!mode.equalsIgnoreCase("ECB")) {
aps = new IvParameterSpec(iv);
}
ci.init(edMode, key, aps);
// Generate a resultText using a single-part enc/dec
resultText = ci.doFinal(inputText);
// Generate outputText for each multi-part en/de-cryption
/* Combination #1:
update(byte[], int, int)
doFinal(byte[], int, int)
*/
byte[] part11 = ci.update(inputText, 0, inputText.length);
byte[] part12 = ci.doFinal();
byte[] outputText1 = new byte[part11.length + part12.length];
System.arraycopy(part11, 0, outputText1, 0, part11.length);
System.arraycopy(part12, 0, outputText1, part11.length,
part12.length);
List<byte[]> outputTexts = new ArrayList<>(4);
outputTexts.add(outputText1);
/* Combination #2:
update(byte[], int, int)
doFinal(byte[], int, int, byte[], int)
*/
byte[] part21 = ci.update(inputText, 0, inputText.length - 5);
byte[] part22 = new byte[ci.getOutputSize(inputText.length)];
int len2 = ci
.doFinal(inputText, inputText.length - 5, 5, part22, 0);
byte[] outputText2 = new byte[part21.length + len2];
System.arraycopy(part21, 0, outputText2, 0, part21.length);
System.arraycopy(part22, 0, outputText2, part21.length, len2);
outputTexts.add(outputText2);
/* Combination #3:
update(byte[], int, int, byte[], int)
doFinal(byte[], int, int)
*/
byte[] part31 = new byte[ci.getOutputSize(inputText.length)];
int len3 = ci.update(inputText, 0, inputText.length - 8, part31, 0);
byte[] part32 = ci.doFinal(inputText, inputText.length - 8, 8);
byte[] outputText3 = new byte[len3 + part32.length];
System.arraycopy(part31, 0, outputText3, 0, len3);
System.arraycopy(part32, 0, outputText3, len3, part32.length);
outputTexts.add(outputText3);
/* Combination #4:
update(byte[], int, int, byte[], int)
doFinal(byte[], int, int, byte[], int)
*/
byte[] part41 = new byte[ci.getOutputSize(inputText.length)];
int len4 = ci.update(inputText, 0, inputText.length - 8, part41, 0);
int rest4 = ci.doFinal(inputText, inputText.length - 8, 8, part41,
len4);
byte[] outputText4 = new byte[len4 + rest4];
System.arraycopy(part41, 0, outputText4, 0, outputText4.length);
outputTexts.add(outputText4);
// Compare results
for (int k = 0; k < outputTexts.size(); k++) {
if (!Arrays.equals(resultText, outputTexts.get(k))) {
out.println(" Testing: " + algo + "/" + mode + "/" + pad);
throw new RuntimeException(
"Compare value of resultText and combination " + k
+ " are not same. Test failed.");
}
}
if (keyStrength > Cipher.getMaxAllowedKeyLength(algo)) {
throw new RuntimeException(
"Expected exception uncaught, keyStrength "
+ keyStrength);
}
} catch (InvalidKeyException ex) {
if (keyStrength <= Cipher.getMaxAllowedKeyLength(algo)) {
out.println("Unexpected exception in " + algo + "/" + mode
+ "/" + pad + " , KeySize " + keyStrength);
throw ex;
}
out.println("Caught InvalidKeyException as expected");
}
}
}