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Java example source code file (SignWithOutputBuffer.java)
The SignWithOutputBuffer.java Java example source code/* * 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); } } Other Java examples (source code examples)Here is a short list of links related to this Java SignWithOutputBuffer.java source code file: |
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