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/*
* Copyright (C) 2009 The Android Open Source Project
*
* 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 tests.security;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import junit.framework.Assert;
public abstract class CipherHelper<T> extends TestHelper<T> {
private final String algorithmName;
private final String plainData;
private final int mode1;
private final int mode2;
public CipherHelper(String algorithmName, String plainData, int mode1, int mode2) {
this.algorithmName = algorithmName;
this.plainData = plainData;
this.mode1 = mode1;
this.mode2 = mode2;
}
public void test(Key encryptKey, Key decryptKey) {
Cipher cipher = null;
try {
cipher = Cipher.getInstance(algorithmName);
} catch (NoSuchAlgorithmException e) {
Assert.fail(e.getMessage());
} catch (NoSuchPaddingException e) {
Assert.fail(e.getMessage());
}
try {
cipher.init(mode1, encryptKey);
} catch (InvalidKeyException e) {
Assert.fail(e.getMessage());
}
byte[] encrypted = crypt(cipher, plainData.getBytes());
try {
cipher.init(mode2, decryptKey);
} catch (InvalidKeyException e) {
Assert.fail(e.getMessage());
}
byte[] decrypted = crypt(cipher, encrypted);
String decryptedString = new String(decrypted);
Assert.assertEquals("transformed data does not match", plainData,
decryptedString);
}
public byte[] crypt(Cipher cipher, byte[] input) {
try {
return cipher.doFinal(input);
} catch (IllegalBlockSizeException e) {
Assert.fail(e.getMessage());
} catch (BadPaddingException e) {
Assert.fail(e.getMessage());
}
return null;
}
}
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