| /* |
| * Copyright (c) 2003, 2015, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.security.jca; |
| |
| import java.lang.ref.*; |
| |
| import java.security.*; |
| |
| /** |
| * Collection of static utility methods used by the security framework. |
| * |
| * @author Andreas Sterbenz |
| * @since 1.5 |
| */ |
| public final class JCAUtil { |
| |
| private JCAUtil() { |
| // no instantiation |
| } |
| |
| // 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 static final 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); |
| } |
| |
| // cached SecureRandom instance |
| private static class CachedSecureRandomHolder { |
| public static SecureRandom instance = new SecureRandom(); |
| } |
| |
| /** |
| * Get a SecureRandom instance. This method should be 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() { |
| return CachedSecureRandomHolder.instance; |
| } |
| |
| } |