--- a/src/java.base/share/classes/sun/security/util/ArrayUtil.java	Fri Aug 17 13:40:17 2018 -0400
+++ b/src/java.base/share/classes/sun/security/util/ArrayUtil.java	Fri Aug 17 14:37:01 2018 -0400
@@ -32,7 +32,7 @@
 
 
 /**
- * This class holds the various utility methods for array range checks.
+ * This class holds the various utility methods for arrays.
  */
 
 public final class ArrayUtil {
@@ -52,4 +52,22 @@
         // NPE is thrown when array is null
         Preconditions.checkFromIndexSize(offset, len, array.length, AIOOBE_SUPPLIER);
     }
+
+
+    private static void swap(byte[] arr, int i, int j) {
+        byte tmp = arr[i];
+        arr[i] = arr[j];
+        arr[j] = tmp;
+    }
+
+    public static void reverse(byte [] arr) {
+        int i = 0;
+        int j = arr.length - 1;
+
+        while (i < j) {
+            swap(arr, i, j);
+            i++;
+            j--;
+        }
+    }
 }

--- a/src/java.base/share/classes/sun/security/util/ECUtil.java	Fri Aug 17 13:40:17 2018 -0400
+++ b/src/java.base/share/classes/sun/security/util/ECUtil.java	Fri Aug 17 14:37:01 2018 -0400
@@ -230,7 +230,7 @@
     public static BigInteger decodeXecPublicKey(byte[] key,
                                                 XECParameters params) {
 
-        reverse(key);
+        ArrayUtil.reverse(key);
 
         // clear the extra bits
         int bitsMod8 = params.getBits() % 8;
@@ -256,7 +256,7 @@
                                             XECParameters params) {
 
         byte[] u_arr = u.toByteArray();
-        ECUtil.reverse(u_arr);
+        ArrayUtil.reverse(u_arr);
         // u_arr may be too large or too small, depending on the value of u
         return Arrays.copyOf(u_arr, params.getBytes());
     }
@@ -270,22 +270,5 @@
         return encodeXecPublicKey(u, params);
     }
 
-    private static void swap(byte[] arr, int i, int j) {
-        byte tmp = arr[i];
-        arr[i] = arr[j];
-        arr[j] = tmp;
-    }
-
-    public static void reverse(byte [] arr) {
-        int i = 0;
-        int j = arr.length - 1;
-
-        while (i < j) {
-            swap(arr, i, j);
-            i++;
-            j--;
-        }
-    }
-
     private ECUtil() {}
 }