129 lines
4.5 KiB
Java
129 lines
4.5 KiB
Java
/*
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* Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import javax.crypto.Cipher;
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import javax.crypto.KeyGenerator;
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import javax.crypto.SecretKey;
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import java.security.AlgorithmParameters;
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import java.util.Arrays;
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/*
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* @test
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* @summary Verify when decrypting over an existing buffer than padding does not
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* overwrite past what the plaintext length is.
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*
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*/
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public class SameBufferOverwrite {
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private SecretKey skey;
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private Cipher c;
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private int start = 17, end = 17; // default
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SameBufferOverwrite(String algo, String transformation)
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throws Exception {
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KeyGenerator kg = KeyGenerator.getInstance(algo, "SunJCE");
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skey = kg.generateKey();
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c = Cipher.getInstance(transformation, "SunJCE");
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}
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/*
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* Run the test
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*/
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void test() throws Exception {
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byte[] in = new byte[end + (c.getBlockSize() - (end % c.getBlockSize()))];
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Arrays.fill(in, (byte)8);
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int len = start;
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AlgorithmParameters params = null;
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System.out.println("Testing transformation: " + c.getAlgorithm() +
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", byte length from " + start + " to " + end);
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while (end >= len) {
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// encrypt
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c.init(Cipher.ENCRYPT_MODE, skey, params);
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byte[] out = c.doFinal(in, 0, len);
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System.out.println(" enc = " + byteToHex(out));
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System.out.println(" => enc " + len + " bytes, ret " +
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(out == null ? "null" : (out.length + " byte")));
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// decrypt
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params = c.getParameters();
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c.init(Cipher.DECRYPT_MODE, skey, params);
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int rLen = c.doFinal(out, 0, out.length, in);
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System.out.println(" dec = " + byteToHex(in));
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System.out.println(" => dec " + out.length + " bytes, ret " +
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rLen + " byte");
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// check if more than rLen bytes are written into 'in'
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for (int j = rLen; j < in.length; j++) {
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if (in[j] != (byte) 8) {
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throw new Exception("Value check failed at index " + j);
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}
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}
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System.out.println(" Test Passed: len = " + len);
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len++;
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// Because GCM doesn't allow params reuse
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if (c.getAlgorithm().contains("GCM")) {
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params = null;
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}
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}
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}
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/**
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* Builder method for the test to run data lengths from the start value to
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* the end value. To do one length, have start and end equal that number.
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* @param start starting data length
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* @param end ending data length
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*/
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SameBufferOverwrite iterate(int start, int end) {
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this.start = start;
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this.end = end;
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return this;
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}
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public static void main(String args[]) throws Exception {
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new SameBufferOverwrite("AES", "AES/GCM/NoPadding").iterate(1, 25).
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test();
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new SameBufferOverwrite("AES", "AES/CTR/NoPadding").iterate(1, 25).
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test();
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new SameBufferOverwrite("AES", "AES/CBC/PKCS5Padding").iterate(1, 25).
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test();
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new SameBufferOverwrite("AES", "AES/ECB/PKCS5Padding").iterate(1, 25).
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test();
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new SameBufferOverwrite("DES", "DES/CBC/PKCS5Padding").iterate(1, 17).
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test();
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new SameBufferOverwrite("DESede", "DESede/CBC/PKCS5Padding").iterate(1, 17).
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test();
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}
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private static String byteToHex(byte[] barray) {
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StringBuilder s = new StringBuilder();
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for (byte b : barray) {
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s.append(String.format("%02x", b));
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}
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return s.toString();
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}
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}
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