android-platform-libcore/luni/src/test/java/org/apache/harmony/crypto/tests/javax/crypto/func/CipherSymmetricKeyThread.java

/*
 * Copyright (C) 2008 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 org.apache.harmony.crypto.tests.javax.crypto.func;


import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.IvParameterSpec;

public class CipherSymmetricKeyThread extends CipherThread {
    CipherSymmetricKeyThread(String name, int[] keys, String[] modes, String[] paddings) {
        super(name, keys, modes, paddings);
    }


    @Override
    public void crypt() throws Exception {
        byte[] output = new byte[128];
        byte[] decrypted = new byte[128];
        byte[] input  =  getData().getBytes();
        SecureRandom sr = new SecureRandom();
        byte[] iv = null;//new byte[16];
        int outputSize = 0;

        KeyGenerator kg = KeyGenerator.getInstance(getAlgName());
        kg.init(getKeyLength(), new SecureRandom());
        Key key = kg.generateKey();

        Cipher cip = Cipher.getInstance(getAlgName() + "/" + getMode() + "/" +
                    getPadding());
        if (getAlgName() != "AES") {
            iv = new byte[8];
        } else {
            iv = new byte[16];
        }
        sr.nextBytes(iv);
        IvParameterSpec ivspec = new IvParameterSpec(iv);
        if (getMode() != "ECB") {
            cip.init(Cipher.ENCRYPT_MODE, key, ivspec);
            cip.doFinal(input, 0, input.length, output);
            outputSize = cip.getOutputSize(input.length);
            iv = cip.getIV();
            ivspec = new IvParameterSpec(iv);
            cip.init(Cipher.DECRYPT_MODE, key, ivspec);
            cip.doFinal(output, 0, outputSize, decrypted);
        } else {
            cip.init(Cipher.ENCRYPT_MODE, key);
            cip.doFinal(input, 0, input.length, output);
            outputSize = cip.getOutputSize(input.length);
            cip.init(Cipher.DECRYPT_MODE, key);
            cip.doFinal(output, 0, outputSize, decrypted);
        }

        checkEncodedData(getData().getBytes(), decrypted);
    }
}