85 lines
3.1 KiB
Java
85 lines
3.1 KiB
Java
/*
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* Copyright (c) 2017, 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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/*
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* @test
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* @bug 8183591
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* @summary Test decoding of DER length fields containing Integer.MAX_VALUE
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* @run main TestMaxLengthDER
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*/
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import java.io.*;
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import java.math.*;
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import java.security.*;
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import java.security.spec.*;
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public class TestMaxLengthDER {
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public static void main(String[] args) throws Exception {
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String message = "Message";
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Signature sig = Signature.getInstance("SHA256withDSA");
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KeyPairGenerator kpg = KeyPairGenerator.getInstance("DSA");
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SecureRandom rnd = new SecureRandom();
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rnd.setSeed(1);
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kpg.initialize(2048, rnd);
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KeyPair kp = kpg.generateKeyPair();
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sig.initSign(kp.getPrivate());
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sig.update(message.getBytes());
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byte[] sigData = sig.sign();
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// Set the length of the second integer to Integer.MAX_VALUE
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// First copy all the signature data to the correct location
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int lengthPos = sigData[3] + 5;
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byte[] modifiedSigData = new byte[sigData.length + 4];
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System.arraycopy(sigData, 0, modifiedSigData, 0, lengthPos);
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System.arraycopy(sigData, lengthPos + 1, modifiedSigData,
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lengthPos + 5, sigData.length - (lengthPos + 1));
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// Increase the length (in bytes) of the sequence to account for
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// the larger length field
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modifiedSigData[1] += 4;
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// Modify the length field
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modifiedSigData[lengthPos] = (byte) 0x84;
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modifiedSigData[lengthPos + 1] = (byte) 0x7F;
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modifiedSigData[lengthPos + 2] = (byte) 0xFF;
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modifiedSigData[lengthPos + 3] = (byte) 0xFF;
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modifiedSigData[lengthPos + 4] = (byte) 0xFF;
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sig.initVerify(kp.getPublic());
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sig.update(message.getBytes());
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try {
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sig.verify(modifiedSigData);
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throw new RuntimeException("No exception on misencoded signature");
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} catch (SignatureException ex) {
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if (ex.getCause() instanceof EOFException) {
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// this is expected
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} else {
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throw ex;
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}
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}
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}
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}
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