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 }