1 /*
   2  * Copyright (c) 2002, 2013, 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  * @bug 4517355
  27  * @summary Verify that AES cipher.doFinal method does NOT need more
  28  *      than necessary bytes in decrypt mode
  29  * @author Valerie Peng
  30  * @key randomness
  31  */
  32 import java.io.PrintStream;
  33 import java.security.*;
  34 import java.security.spec.*;
  35 import java.util.*;
  36 
  37 import javax.crypto.*;
  38 import javax.crypto.spec.*;
  39 import java.security.Provider;
  40 import com.sun.crypto.provider.*;
  41 
  42 public class Test4517355 {
  43 
  44     private static final String ALGO = "AES";
  45     private static final int KEYSIZE = 16; // in bytes
  46 
  47     private static byte[] plainText = new byte[125];
  48 
  49     public void execute(String mode, String padding) throws Exception {
  50         String transformation = ALGO + "/" + mode + "/" + padding;
  51 
  52         Cipher ci = Cipher.getInstance(transformation, "SunJCE");
  53         KeyGenerator kg = KeyGenerator.getInstance(ALGO, "SunJCE");
  54         kg.init(KEYSIZE*8);
  55         SecretKey key = kg.generateKey();
  56 
  57         // TEST FIX 4517355
  58         ci.init(Cipher.ENCRYPT_MODE, key);
  59         byte[] cipherText = ci.doFinal(plainText);
  60 
  61         if (mode.equalsIgnoreCase("GCM")) {
  62             AlgorithmParameters params = ci.getParameters();
  63             ci.init(Cipher.DECRYPT_MODE, key, params);
  64         } else {
  65             byte[] iv = ci.getIV();
  66             AlgorithmParameterSpec aps = new IvParameterSpec(iv);
  67             ci.init(Cipher.DECRYPT_MODE, key, aps);
  68         }
  69         byte[] recoveredText = new byte[plainText.length];
  70         try {
  71             int len = ci.doFinal(cipherText, 0, cipherText.length,
  72                                  recoveredText);
  73         } catch (ShortBufferException ex) {
  74             throw new Exception("output buffer is the right size!");
  75         }
  76 
  77         // BONUS TESTS
  78         // 1. make sure the recoveredText is the same as the plainText
  79         if (!Arrays.equals(plainText, recoveredText)) {
  80             throw new Exception("encryption/decryption does not work!");
  81         }
  82         // 2. make sure encryption does happen
  83         if (Arrays.equals(plainText, cipherText)) {
  84             throw new Exception("encryption does not work!");
  85         }
  86         // 3. make sure padding is working
  87         if (padding.equalsIgnoreCase("PKCS5Padding")) {
  88             if ((cipherText.length/16)*16 != cipherText.length) {
  89                 throw new Exception("padding does not work!");
  90             }
  91         }
  92         System.out.println(transformation + ": Passed");
  93     }
  94 
  95     public static void main (String[] args) throws Exception {
  96         Security.addProvider(new com.sun.crypto.provider.SunJCE());
  97 
  98         Test4517355 test = new Test4517355();
  99         Random rdm = new Random();
 100         rdm.nextBytes(test.plainText);
 101 
 102         test.execute("CBC", "PKCS5Padding");
 103         test.execute("GCM", "NoPadding");
 104     }
 105 }
--- EOF ---