1 /*

     2  * Copyright (c) 2016, 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 import java.security.*;

    25 

    26 /*

    27  * @test

    28  * @bug 8161571

    29  * @summary Reject signatures presented for verification that contain extra

    30  *          bytes.

    31  * @run main SignatureLength

    32  */

    33 public class SignatureLength {

    34 

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

    36         main0("EC", 256, "SHA256withECDSA", "SunEC");

    37         main0("RSA", 2048, "SHA256withRSA", "SunRsaSign");

    38         main0("DSA", 2048, "SHA256withDSA", "SUN");

    39 

    40         if (System.getProperty("os.name").equals("SunOS")) {

    41             main0("EC", 256, "SHA256withECDSA", null);

    42             main0("RSA", 2048, "SHA256withRSA", null);

    43         }

    44     }

    45 

    46     private static void main0(String keyAlgorithm, int keysize,

    47             String signatureAlgorithm, String provider) throws Exception {

    48         byte[] plaintext = "aaa".getBytes("UTF-8");

    49 

    50         // Generate

    51         KeyPairGenerator generator =

    52             provider == null ?

    53                 (KeyPairGenerator) KeyPairGenerator.getInstance(keyAlgorithm) :

    54                 (KeyPairGenerator) KeyPairGenerator.getInstance(

    55                                        keyAlgorithm, provider);

    56         generator.initialize(keysize);

    57         System.out.println("Generating " + keyAlgorithm + " keypair using " +

    58             generator.getProvider().getName() + " JCE provider");

    59         KeyPair keypair = generator.generateKeyPair();

    60 

    61         // Sign

    62         Signature signer =

    63             provider == null ?

    64                 Signature.getInstance(signatureAlgorithm) :

    65                 Signature.getInstance(signatureAlgorithm, provider);

    66         signer.initSign(keypair.getPrivate());

    67         signer.update(plaintext);

    68         System.out.println("Signing using " + signer.getProvider().getName() +

    69             " JCE provider");

    70         byte[] signature = signer.sign();

    71 

    72         // Invalidate

    73         System.out.println("Invalidating signature ...");

    74         byte[] badSignature = new byte[signature.length + 5];

    75         System.arraycopy(signature, 0, badSignature, 0, signature.length);

    76         badSignature[signature.length] = 0x01;

    77         badSignature[signature.length + 1] = 0x01;

    78         badSignature[signature.length + 2] = 0x01;

    79         badSignature[signature.length + 3] = 0x01;

    80         badSignature[signature.length + 4] = 0x01;

    81 

    82         // Verify

    83         Signature verifier =

    84             provider == null ?

    85                 Signature.getInstance(signatureAlgorithm) :

    86                 Signature.getInstance(signatureAlgorithm, provider);

    87         verifier.initVerify(keypair.getPublic());

    88         verifier.update(plaintext);

    89         System.out.println("Verifying using " +

    90             verifier.getProvider().getName() + " JCE provider");

    91 

    92         try {

    93             System.out.println("Valid? " + verifier.verify(badSignature));

    94             throw new Exception(

    95                 "ERROR: expected a SignatureException but none was thrown");

    96         } catch (SignatureException e) {

    97             System.out.println("OK: caught expected exception: " + e);

    98         }

    99         System.out.println();

   100     }

   101 }