1 /*

     2  * Copyright 2002 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @bug 4511556

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

    28  */

    29 

    30 import java.io.*;

    31 import java.util.Arrays;

    32 import java.math.BigInteger;

    33 

    34 import sun.security.util.DerInputStream;

    35 

    36 public class PaddedBitString {

    37 

    38     // Relaxed the BitString parsing routine to accept bit strings

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

    40     // bit string as DER_BITSTRING_NOPAD.

    41     // Note:

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

    43     // 2. value of the padding bits is ignored

    44 

    45     // bit string (01011101 11000000)

    46     // With 6 padding bits (01011101 11001011)

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

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

    49 

    50     // With no padding bits

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

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

    53 

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

    55         byte[] ba0, ba1;

    56         try {

    57             DerInputStream derin = new DerInputStream(DER_BITSTRING_PAD6);

    58             ba1 = derin.getBitString();

    59         } catch( IOException e ) {

    60             e.printStackTrace();

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

    62         }

    63 

    64         try {

    65             DerInputStream derin = new DerInputStream(DER_BITSTRING_NOPAD);

    66             ba0 = derin.getBitString();

    67         } catch( IOException e ) {

    68             e.printStackTrace();

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

    70         }

    71 

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

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

    74         }

    75     }

    76 }