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