BigInteger0.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * 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).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 4492053
 * @summary Verify invalid zero length Integer value is rejected
 * @modules java.base/sun.security.util
 */

import java.io.*;
import java.math.BigInteger;

import sun.security.util.DerInputStream;

public class BigInteger0 {

  // invalid zero length value
  private final static byte[] INT_LEN0 = { 2, 0 };

  // correct zero integer
  private final static byte[] INT0 = { 2, 1, 0 };

  public static void main(String args[]) throws Exception {
    try {
      DerInputStream derin = new DerInputStream(INT_LEN0);
      BigInteger bi = derin.getBigInteger();
      throw new Exception("Succeeded parsing invalid zero length value");
    } catch( IOException e ) {
      System.out.println("OK, zero length value rejected.");
    }

    DerInputStream derin = new DerInputStream(INT0);
    BigInteger bi = derin.getBigInteger();
    if( bi.equals(BigInteger.ZERO) == false ) {
      throw new Exception("Failed to parse Integer 0");
    }

  }

}