com.sun.enterprise.universal.security.SecurityUtils Maven / Gradle / Ivy
/*
* 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();
}
}