/*

 * 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 Test CipherInputStream/OutputStream func w/ GCM mode and AAD.

 * @author Valerie Peng

 * @key randomness

 */

import java.io.*;

import java.security.*;

import java.util.*;

import javax.crypto.*;

import javax.crypto.spec.*;

public class TestCICOWithGCMAndAAD extends UcryptoTest {

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

        main(new TestCICOWithGCMAndAAD(), null);

    }

    public void doTest(Provider p) throws Exception {

        // check if GCM support exists

        try {

            Cipher.getInstance("AES/GCM/NoPadding", p);

        } catch (NoSuchAlgorithmException nsae) {

            System.out.println("Skipping Test due to no GCM support");

            return;

        }

        Random rdm = new Random();

        //init Secret Key

        byte[] keyValue = new byte[16];

        rdm.nextBytes(keyValue);

        SecretKey key = new SecretKeySpec(keyValue, "AES");

        //Do initialization of the plainText

        byte[] plainText = new byte[400];

        rdm.nextBytes(plainText);

        byte[] aad = new byte[128];

        rdm.nextBytes(aad);

        byte[] aad2 = aad.clone();

        aad2[50]++;

        byte[] iv = new byte[16];

        rdm.nextBytes(iv);

        GCMParameterSpec spec = new GCMParameterSpec(128, iv);

        Cipher encCipher = Cipher.getInstance("AES/GCM/NoPadding", p);

        encCipher.init(Cipher.ENCRYPT_MODE, key, spec);

        encCipher.updateAAD(aad);

        Cipher decCipher = Cipher.getInstance("AES/GCM/NoPadding", p);

        decCipher.init(Cipher.DECRYPT_MODE, key, spec);  //encCipher.getParameters());

        decCipher.updateAAD(aad);

        byte[] recovered = test(encCipher, decCipher, plainText);

        if (!Arrays.equals(plainText, recovered)) {

            throw new Exception("sameAAD: diff check failed!");

        } else System.out.println("sameAAD: passed");

        encCipher.init(Cipher.ENCRYPT_MODE, key);

        encCipher.updateAAD(aad2);

        recovered = test(encCipher, decCipher, plainText);

        if (recovered != null && recovered.length != 0) {

            throw new Exception("diffAAD: no data should be returned!");

        } else System.out.println("diffAAD: passed");

   }

   private static byte[] test(Cipher encCipher, Cipher decCipher, byte[] plainText)

            throws Exception {

        //init cipher streams

        ByteArrayInputStream baInput = new ByteArrayInputStream(plainText);

        CipherInputStream ciInput = new CipherInputStream(baInput, encCipher);

        ByteArrayOutputStream baOutput = new ByteArrayOutputStream();

        CipherOutputStream ciOutput = new CipherOutputStream(baOutput, decCipher);

        //do test

        byte[] buffer = new byte[200];

        int len = ciInput.read(buffer);

        System.out.println("read " + len + " bytes from input buffer");

        while (len != -1) {

            ciOutput.write(buffer, 0, len);

            System.out.println("wite " + len + " bytes to output buffer");

            len = ciInput.read(buffer);

            if (len != -1) {

                System.out.println("read " + len + " bytes from input buffer");

            } else {

                System.out.println("finished reading");

            }

        }

        ciOutput.flush();

        ciInput.close();

        ciOutput.close();

        return baOutput.toByteArray();

    }

}