/*
* Copyright 2003 Sun Microsystems, Inc. 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. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
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*/
package com.zaranux.client.crypto.spec;
//import java.lang.ref.*;
import com.zaranux.client.crypto.SecureRandom;
/**
* Collection of static utility methods used by the security framework.
*
* @author Andreas Sterbenz
* @since 1.5
*/
public final class JCAUtil {
private JCAUtil() {
// no instantiation
}
// lock to use for synchronization
// Saman private static final Object LOCK = JCAUtil.class;
// cached SecureRandom instance
private static /* Saman volatile */ SecureRandom secureRandom;
// size of the temporary arrays we use. Should fit into the CPU's 1st
// level cache and could be adjusted based on the platform
private final static int ARRAY_SIZE = 4096;
/**
* Get the size of a temporary buffer array to use in order to be
* cache efficient. totalSize indicates the total amount of data to
* be buffered. Used by the engineUpdate(ByteBuffer) methods.
*/
public static int getTempArraySize(int totalSize) {
return Math.min(ARRAY_SIZE, totalSize);
}
/**
* Get a SecureRandom instance. This method should me used by JDK
* internal code in favor of calling "new SecureRandom()". That needs to
* iterate through the provider table to find the default SecureRandom
* implementation, which is fairly inefficient.
*/
public static SecureRandom getSecureRandom() {
// we use double checked locking to minimize synchronization
// works because we use a volatile reference
//Saman
if(secureRandom == null)
{
secureRandom = new SecureRandom();
}
return secureRandom;
}
}