--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/share/classes/sun/security/util/ArrayUtil.java	Fri Jul 13 02:36:42 2018 +0000
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2018, 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.util;
+
+import java.util.List;
+import java.util.function.BiFunction;
+import java.security.*;
+import jdk.internal.util.Preconditions;
+
+
+/**
+ * This class holds the various utility methods for array range checks.
+ */
+
+public final class ArrayUtil {
+
+    private static final BiFunction<String, List<Integer>,
+            ArrayIndexOutOfBoundsException> AIOOBE_SUPPLIER =
+            Preconditions.outOfBoundsExceptionFormatter
+            (ArrayIndexOutOfBoundsException::new);
+
+    public static void blockSizeCheck(int len, int blockSize) {
+        if ((len % blockSize) != 0) {
+            throw new ProviderException("Internal error in input buffering");
+        }
+    }
+
+    public static void nullAndBoundsCheck(byte[] array, int offset, int len) {
+        // NPE is thrown when array is null
+        Preconditions.checkFromIndexSize(offset, len, array.length, AIOOBE_SUPPLIER);
+    }
+}