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 * @key randomness 31 */ 32 import java.io.PrintStream; 33 import java.security.*; 34 import java.security.spec.*; 35 import java.util.Random; 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 Test4513830 { 43 44 private static final String ALGO = "AES"; 45 private static final String MODE = "ECB"; 46 private static final String PADDING = "PKCS5Padding"; 47 private static final int KEYSIZE = 16; // in bytes 48 private static final int TEXTLENGTHS[] = { 49 16, 17, 18, 19, 20, 21, 22, 23 }; 50 51 public boolean execute() throws Exception { 52 Random rdm = new Random(); 53 byte[] plainText=new byte[125]; 54 rdm.nextBytes(plainText); 55 56 Cipher ci = Cipher.getInstance(ALGO+"/"+MODE+"/"+PADDING, "SunJCE"); 57 58 // TEST FIX 4513830 59 KeyGenerator kg = KeyGenerator.getInstance(ALGO, "SunJCE"); 60 kg.init(KEYSIZE*8); 61 SecretKey key = kg.generateKey(); 62 63 ci.init(Cipher.DECRYPT_MODE, key); 64 int recoveredTextLength = ci.getOutputSize(16); 65 66 if (recoveredTextLength != 16) { 67 throw new Exception("output size should not increase when decrypting!"); 68 } 69 70 // BONUS TESTS 71 // 1. call getOutputSize with various lengths and see if 72 // the returned size is correct. 73 for (int i=0; i<TEXTLENGTHS.length; i++) { 74 ci.init(Cipher.ENCRYPT_MODE, key); 75 int cipherTextLength = ci.getOutputSize(TEXTLENGTHS[i]); 76 if (cipherTextLength != 32) { 77 throw new Exception("output size " + cipherTextLength 78 + " for input size " + TEXTLENGTHS[i] 79 + " when encrypting is wrong!"); 80 } 81 } 82 83 // passed all tests...hooray! 84 return true; 85 } 86 87 public static void main (String[] args) throws Exception { 88 Security.addProvider(new com.sun.crypto.provider.SunJCE()); 89 90 Test4513830 test = new Test4513830(); 91 String testName = test.getClass().getName() + "[" + ALGO + 92 "/" + MODE + "/" + PADDING + "]"; 93 if (test.execute()) { 94 System.out.println(testName + ": Passed!"); 95 } 96 } 97 }