/*

 * 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

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 */

import java.security.InvalidAlgorithmParameterException;

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import java.security.NoSuchProviderException;

import java.security.spec.AlgorithmParameterSpec;

import java.util.Arrays;

import java.util.Random;

import javax.crypto.BadPaddingException;

import javax.crypto.Cipher;

import javax.crypto.IllegalBlockSizeException;

import javax.crypto.KeyGenerator;

import javax.crypto.NoSuchPaddingException;

import javax.crypto.SecretKey;

import javax.crypto.ShortBufferException;

import javax.crypto.spec.IvParameterSpec;

/**

 * @test

 * @bug 8043836

 * @summary Test AES ciphers with 4 different modes with NoPadding. Check if

 *          data before encryption and after decryption is the same.

 */

public class CTR {

    private static final String ALGORITHM = "AES";

    private static final String PROVIDER = "SunJCE";

    private static final String[] MODES = {"CTR","CFB24","OFB32","GCM"};

    private static final String PADDING = "NoPadding";

    private static final int KEY_LENGTH = 128;

    public static void main(String argv[]) throws Exception {

        CTR test = new CTR();

        for (String mode : MODES) {

            test.runTest(ALGORITHM, mode, PADDING);

        }

    }

    public void runTest(String algo, String mo, String pad) throws Exception {

        Cipher ci = null;

        byte[] iv = null;

        AlgorithmParameterSpec aps = null;

        SecretKey key = null;

        try {

            Random rdm = new Random();

            byte[] plainText;

            ci = Cipher.getInstance(algo + "/" + mo + "/" + pad, PROVIDER);

            KeyGenerator kg = KeyGenerator.getInstance(algo, PROVIDER);

            kg.init(KEY_LENGTH);

            key = kg.generateKey();

            for (int i = 0; i < 15; i++) {

                plainText = new byte[1600 + i + 1];

                rdm.nextBytes(plainText);

                if (!mo.equalsIgnoreCase("GCM")) {

                    ci.init(Cipher.ENCRYPT_MODE, key, aps);

                } else {

                    ci.init(Cipher.ENCRYPT_MODE, key);

                }

                byte[] cipherText = new byte[ci.getOutputSize(plainText.length)];

                int offset = ci.update(plainText, 0, plainText.length,

                        cipherText, 0);

                ci.doFinal(cipherText, offset);

                if (!mo.equalsIgnoreCase("ECB")) {

                    iv = ci.getIV();

                    aps = new IvParameterSpec(iv);

                } else {

                    aps = null;

                }

                if (!mo.equalsIgnoreCase("GCM")) {

                    ci.init(Cipher.DECRYPT_MODE, key, aps);

                } else {

                    ci.init(Cipher.DECRYPT_MODE, key, ci.getParameters());

                }

                byte[] recoveredText = new byte[ci.getOutputSize(cipherText.length)];

                int len = ci.doFinal(cipherText, 0, cipherText.length,

                        recoveredText);

                byte[] tmp = new byte[len];

                for (int j = 0; j < len; j++) {

                    tmp[j] = recoveredText[j];

                }

                Arrays.toString(plainText);

                if (!java.util.Arrays.equals(plainText, tmp)) {

                    System.out.println("Original: ");

                    dumpBytes(plainText);

                    System.out.println("Recovered: ");

                    dumpBytes(tmp);

                    throw new RuntimeException("Original text is not equal with recovered text, with mode:" + mo);

                }

            }

        } catch (NoSuchAlgorithmException | NoSuchProviderException | NoSuchPaddingException

                | InvalidKeyException | InvalidAlgorithmParameterException

                | ShortBufferException | IllegalBlockSizeException

                | BadPaddingException e) {

            System.out.println("Test failed!");

            throw e;

        }

    }

    private void dumpBytes(byte[] bytes){

        for (byte b : bytes){

            System.out.print(Integer.toHexString(b));

        }

        System.out.println();

    }

}