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undefect. CWE-407 — 63 sites patched across 27 ecosystems

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Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.
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russell@unturf.com 2026-03-26 17:11:57 -04:00
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test/jdk/java/security/Signature/SignWithOutputBuffer.java Normal file
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/*
* Copyright (c) 1998, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 4114896
* @summary Signature should support a sign() method that places the signature
* in an already existing array.
* @run main SignWithOutputBuffer DSS 512
* @run main SignWithOutputBuffer SHA256withDSA 2048
*/
import java.security.*;
public class SignWithOutputBuffer {
public static void main(String[] args) throws Exception {
int numBytes;
String kpgAlgorithm = "DSA";
int keySize = Integer.parseInt(args[1]);
KeyPairGenerator kpGen = KeyPairGenerator.getInstance(kpgAlgorithm);
kpGen.initialize(keySize);
KeyPair kp = kpGen.genKeyPair();
String signAlgo = args[0];
Signature sig = Signature.getInstance(signAlgo);
sig.initSign(kp.getPrivate());
sig.update((byte)0xff);
// Allocate buffer for signature. According to BSAFE, the size of the
// signature may be as many as 48 bytes.
// First, let's allocate a buffer that's too short.
byte[] out = new byte[10];
try {
numBytes = sig.sign(out, 0, out.length);
} catch (SignatureException e) {
System.out.println(e);
}
// Now repeat the same with a buffer that's big enough
sig = Signature.getInstance(signAlgo);
sig.initSign(kp.getPrivate());
sig.update((byte)0xff);
out = new byte[64];
numBytes = sig.sign(out, 0, out.length);
System.out.println("Signature len="+numBytes);
}
}