1 /*
   2  * Copyright (c) 2002, 2007, 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 4513830
  27  * @summary Verify the output size returned by AES cipher.getOutputSize
  28  *      method in DECRYPT mode does not add extra bytes for padding
  29  * @author Valerie Peng

  30  */
  31 import java.io.PrintStream;
  32 import java.security.*;
  33 import java.security.spec.*;
  34 import java.util.Random;
  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 Test4513830 {
  42 
  43     private static final String ALGO = "AES";
  44     private static final String MODE = "ECB";
  45     private static final String PADDING = "PKCS5Padding";
  46     private static final int KEYSIZE = 16; // in bytes
  47     private static final int TEXTLENGTHS[] = {
  48         16, 17, 18, 19, 20, 21, 22, 23 };
  49 
  50     public boolean execute() throws Exception {
  51         Random rdm = new Random();
  52         byte[] plainText=new byte[125];
  53         rdm.nextBytes(plainText);
  54 
  55         Cipher ci = Cipher.getInstance(ALGO+"/"+MODE+"/"+PADDING, "SunJCE");
  56 
  57         // TEST FIX 4513830
  58         KeyGenerator kg = KeyGenerator.getInstance(ALGO, "SunJCE");
  59         kg.init(KEYSIZE*8);
  60         SecretKey key = kg.generateKey();
  61 
  62         ci.init(Cipher.DECRYPT_MODE, key);
  63         int recoveredTextLength = ci.getOutputSize(16);
  64 
  65         if (recoveredTextLength != 16) {
  66             throw new Exception("output size should not increase when decrypting!");
  67         }
  68 
  69         // BONUS TESTS
  70         // 1. call getOutputSize with various lengths and see if
  71         // the returned size is correct.
  72         for (int i=0; i<TEXTLENGTHS.length; i++) {
  73             ci.init(Cipher.ENCRYPT_MODE, key);
  74             int cipherTextLength = ci.getOutputSize(TEXTLENGTHS[i]);
  75             if (cipherTextLength != 32) {
  76                 throw new Exception("output size " + cipherTextLength
  77                                     + " for input size " + TEXTLENGTHS[i]
  78                                     + " when encrypting is wrong!");
  79             }
  80         }
  81 
  82         // passed all tests...hooray!
  83         return true;
  84     }
  85 
  86     public static void main (String[] args) throws Exception {
  87         Security.addProvider(new com.sun.crypto.provider.SunJCE());
  88 
  89         Test4513830 test = new Test4513830();
  90         String testName = test.getClass().getName() + "[" + ALGO +
  91             "/" + MODE + "/" + PADDING + "]";
  92         if (test.execute()) {
  93             System.out.println(testName + ": Passed!");
  94         }
  95     }
  96 }
--- EOF ---