/*

 * 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.

 *

 */

/*

 * @test

 * @bug 4511556

 * @summary Verify BitString value containing padding bits is accepted.

 */

import java.io.*;

import java.util.Arrays;

import java.math.BigInteger;

import sun.security.util.DerInputStream;

public class PaddedBitString {

    // Relaxed the BitString parsing routine to accept bit strings

    // with padding bits, ex. treat DER_BITSTRING_PAD6 as the same

    // bit string as DER_BITSTRING_NOPAD.

    // Note:

    // 1. the number of padding bits has to be in [0...7]

    // 2. value of the padding bits is ignored

    // bit string (01011101 11000000)

    // With 6 padding bits (01011101 11001011)

    private final static byte[] DER_BITSTRING_PAD6 = { 3, 3, 6,

                                                   (byte)0x5d, (byte)0xcb };

    // With no padding bits

    private final static byte[] DER_BITSTRING_NOPAD = { 3, 3, 0,

                                                   (byte)0x5d, (byte)0xc0 };

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

        byte[] ba0, ba1;

        try {

            DerInputStream derin = new DerInputStream(DER_BITSTRING_PAD6);

            ba1 = derin.getBitString();

        } catch( IOException e ) {

            e.printStackTrace();

            throw new Exception("Unable to parse BitString with 6 padding bits");

        }

        try {

            DerInputStream derin = new DerInputStream(DER_BITSTRING_NOPAD);

            ba0 = derin.getBitString();

        } catch( IOException e ) {

            e.printStackTrace();

            throw new Exception("Unable to parse BitString with no padding");

        }

        if (Arrays.equals(ba1, ba0) == false ) {

            throw new Exception("BitString comparison check failed");

        }

    }

}