1/*
2 * Copyright (c) 1998, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/*
25 * @test
26 * @bug 4114896
27 * @summary Signature should support a sign() method that places the signature
28 * in an already existing array.
29 */
30
31import java.security.*;
32
33public class SignWithOutputBuffer {
34
35    public static void main(String[] args) throws Exception {
36
37        int numBytes;
38
39        KeyPairGenerator kpGen = KeyPairGenerator.getInstance("DSA");
40        kpGen.initialize(512);
41        KeyPair kp = kpGen.genKeyPair();
42
43        Signature sig = Signature.getInstance("DSS");
44        sig.initSign(kp.getPrivate());
45        sig.update((byte)0xff);
46
47        // Allocate buffer for signature. According to BSAFE, the size of the
48        // signature may be as many as 48 bytes.
49        // First, let's allocate a buffer that's too short.
50        byte[] out = new byte[10];
51        try {
52            numBytes = sig.sign(out, 0, out.length);
53        } catch (SignatureException e) {
54            System.out.println(e);
55        }
56
57        // Now repeat the same with a buffer that's big enough
58        sig = Signature.getInstance("DSS");
59        sig.initSign(kp.getPrivate());
60        sig.update((byte)0xff);
61        out = new byte[48];
62        numBytes = sig.sign(out, 0, out.length);
63
64        System.out.println("Signature len="+numBytes);
65    }
66}
67