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