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 }