1 /*
   2  * Copyright (c) 2003, 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @library ..
  27  * @bug 4891312 8074460
  28  * @summary verify that modPow() not broken by the special case for 65537 (use -Dseed=X to set PRNG seed)
  29  * @author Andreas Sterbenz
  30  * @key randomness
  31  */
  32 
  33 import java.math.BigInteger;
  34 
  35 import java.security.*;
  36 import java.security.spec.*;
  37 
  38 public class ModPow65537 {
  39 
  40     public static void main(String[] args) throws Exception {
  41         // SunRsaSign uses BigInteger internally
  42         KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA", "SunRsaSign");
  43         kpg.initialize(new RSAKeyGenParameterSpec(512, BigInteger.valueOf(65537)));
  44         KeyPair kp = kpg.generateKeyPair();
  45         testSigning(kp);
  46 
  47         kpg.initialize(new RSAKeyGenParameterSpec(512, BigInteger.valueOf(65539)));
  48         kp = kpg.generateKeyPair();
  49         testSigning(kp);
  50 
  51         kpg.initialize(new RSAKeyGenParameterSpec(512, BigInteger.valueOf(3)));
  52         kp = kpg.generateKeyPair();
  53         testSigning(kp);
  54 
  55         // basic known answer test
  56         BigInteger base = new BigInteger("19058071224156864789844466979330892664777520457048234786139035643344145635582");
  57         BigInteger mod  = new BigInteger("75554098474976067521257305210610421240510163914613117319380559667371251381587");
  58         BigInteger exp1 = BigInteger.valueOf(65537);
  59         BigInteger exp2 = BigInteger.valueOf(75537);
  60         BigInteger exp3 = new BigInteger("13456870775607312149");
  61 
  62         BigInteger res1 = new BigInteger("5770048609366563851320890693196148833634112303472168971638730461010114147506");
  63         BigInteger res2 = new BigInteger("63446979364051087123350579021875958137036620431381329472348116892915461751531");
  64         BigInteger res3 = new BigInteger("39016891919893878823999350081191675846357272199067075794096200770872982089502");
  65 
  66         if (base.modPow(exp1, mod).equals(res1) == false) {
  67             throw new Exception("Error using " + exp1);
  68         }
  69         if (base.modPow(exp2, mod).equals(res2) == false) {
  70             throw new Exception("Error using " + exp2);
  71         }
  72         if (base.modPow(exp3, mod).equals(res3) == false) {
  73             throw new Exception("Error using " + exp3);
  74         }
  75 
  76         System.out.println("Passed");
  77     }
  78 
  79     private static void testSigning(KeyPair kp) throws Exception {
  80         System.out.println(kp.getPublic());
  81         byte[] data = new byte[1024];
  82         RandomSeed rndSeed = new RandomSeed(false);
  83         System.out.println("Random number generator seed = " + rndSeed.getSeed());
  84         rndSeed.getRandom().nextBytes(data);
  85 
  86         Signature sig = Signature.getInstance("SHA1withRSA", "SunRsaSign");
  87         sig.initSign(kp.getPrivate());
  88         sig.update(data);
  89         byte[] sigBytes = sig.sign();
  90 
  91         sig.initVerify(kp.getPublic());
  92         sig.update(data);
  93         if (sig.verify(sigBytes) == false) {
  94             throw new Exception("signature verification failed");
  95         }
  96         System.out.println("OK");
  97     }
  98 
  99 }