72 lines
2.5 KiB
Java
72 lines
2.5 KiB
Java
/*
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* Copyright (c) 1998, 2024, 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 4114896
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* @summary Signature should support a sign() method that places the signature
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* in an already existing array.
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* @run main SignWithOutputBuffer DSS 512
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* @run main SignWithOutputBuffer SHA256withDSA 2048
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*/
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import java.security.*;
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public class SignWithOutputBuffer {
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public static void main(String[] args) throws Exception {
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int numBytes;
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String kpgAlgorithm = "DSA";
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int keySize = Integer.parseInt(args[1]);
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KeyPairGenerator kpGen = KeyPairGenerator.getInstance(kpgAlgorithm);
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kpGen.initialize(keySize);
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KeyPair kp = kpGen.genKeyPair();
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String signAlgo = args[0];
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Signature sig = Signature.getInstance(signAlgo);
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sig.initSign(kp.getPrivate());
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sig.update((byte)0xff);
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// Allocate buffer for signature. According to BSAFE, the size of the
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// signature may be as many as 48 bytes.
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// First, let's allocate a buffer that's too short.
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byte[] out = new byte[10];
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try {
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numBytes = sig.sign(out, 0, out.length);
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} catch (SignatureException e) {
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System.out.println(e);
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}
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// Now repeat the same with a buffer that's big enough
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sig = Signature.getInstance(signAlgo);
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sig.initSign(kp.getPrivate());
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sig.update((byte)0xff);
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out = new byte[64];
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numBytes = sig.sign(out, 0, out.length);
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System.out.println("Signature len="+numBytes);
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}
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}
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