8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

src/java.base/share/classes/sun/security/jca/JCAUtil.java

@@ -0,0 +1,72 @@
+/*
+ * 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;
+    }
+
+}