| /* |
| * Copyright (c) 2010, 2018 Oracle and/or its affiliates. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0, which is available at |
| * http://www.eclipse.org/legal/epl-2.0. |
| * |
| * This Source Code may also be made available under the following Secondary |
| * Licenses when the conditions for such availability set forth in the |
| * Eclipse Public License v. 2.0 are satisfied: GNU General Public License, |
| * version 2 with the GNU Classpath Exception, which is available at |
| * https://www.gnu.org/software/classpath/license.html. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 |
| */ |
| |
| package com.sun.enterprise.universal.security; |
| |
| import java.security.SecureRandom; |
| |
| /** |
| * Created October 28, 2010 |
| * @author Byron Nevins |
| */ |
| public final class SecurityUtils { |
| |
| public static String getSecureRandomHexString(int numBytes) { |
| SecureRandom random = new SecureRandom(); |
| byte[] bb = new byte[numBytes]; |
| random.nextBytes(bb); |
| return toHexString(bb); |
| } |
| |
| /** |
| * No instances allowed. |
| */ |
| private SecurityUtils() { |
| } |
| |
| static private String toHexString(byte b) { |
| String s = Integer.toHexString((int) b + 128); |
| |
| if (s.length() == 1) |
| s = "0" + s; |
| |
| return s; |
| } |
| |
| static private String toHexString(byte[] bb) { |
| StringBuilder sb = new StringBuilder(); |
| |
| for (byte b : bb) |
| sb.append(toHexString(b)); |
| |
| return sb.toString(); |
| } |
| } |