97 lines
3.3 KiB
Java
97 lines
3.3 KiB
Java
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/*
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* Copyright (c) 2003, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.security.jca;
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import java.lang.ref.*;
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import java.security.*;
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/**
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* Collection of static utility methods used by the security framework.
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*
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* @author Andreas Sterbenz
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* @since 1.5
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*/
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public final class JCAUtil {
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private JCAUtil() {
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// no instantiation
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}
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// size of the temporary arrays we use. Should fit into the CPU's 1st
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// level cache and could be adjusted based on the platform
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private static final int ARRAY_SIZE = 4096;
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/**
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* Get the size of a temporary buffer array to use in order to be
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* cache efficient. totalSize indicates the total amount of data to
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* be buffered. Used by the engineUpdate(ByteBuffer) methods.
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*/
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public static int getTempArraySize(int totalSize) {
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return Math.min(ARRAY_SIZE, totalSize);
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}
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// cached SecureRandom instance
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private static class CachedSecureRandomHolder {
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public static SecureRandom instance = new SecureRandom();
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}
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private static volatile SecureRandom def = null;
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/**
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* Get a SecureRandom instance. This method should be used by JDK
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* internal code in favor of calling "new SecureRandom()". That needs to
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* iterate through the provider table to find the default SecureRandom
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* implementation, which is fairly inefficient.
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*/
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public static SecureRandom getSecureRandom() {
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return CachedSecureRandomHolder.instance;
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}
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// called by sun.security.jca.Providers class when provider list is changed
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static void clearDefSecureRandom() {
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def = null;
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}
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/**
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* Get the default SecureRandom instance. This method is the
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* optimized version of "new SecureRandom()" which re-uses the default
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* SecureRandom impl if the provider table is the same.
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*/
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public static SecureRandom getDefSecureRandom() {
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SecureRandom result = def;
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if (result == null) {
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synchronized (JCAUtil.class) {
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result = def;
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if (result == null) {
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def = result = new SecureRandom();
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}
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}
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}
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return result;
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}
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}
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