/*

 * Copyright (c) 1998, 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.

 */

import java.security.*;

public class SignWithOutputBuffer {

    public static void main(String[] args) throws Exception {

        int numBytes;

        KeyPairGenerator kpGen = KeyPairGenerator.getInstance("DSA");

        kpGen.initialize(512);

        KeyPair kp = kpGen.genKeyPair();

        Signature sig = Signature.getInstance("DSS");

        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("DSS");

        sig.initSign(kp.getPrivate());

        sig.update((byte)0xff);

        out = new byte[48];

        numBytes = sig.sign(out, 0, out.length);

        System.out.println("Signature len="+numBytes);

    }

}