--- a/jdk/src/java.base/share/classes/java/security/MessageDigest.java	Wed Jul 05 22:19:47 2017 +0200
+++ b/jdk/src/java.base/share/classes/java/security/MessageDigest.java	Tue Oct 11 00:04:35 2016 +0000
@@ -32,10 +32,13 @@
 import java.io.PrintStream;
 import java.io.InputStream;
 import java.io.ByteArrayInputStream;
-
+import java.security.InvalidKeyException;
 import java.nio.ByteBuffer;
 
 import sun.security.util.Debug;
+import sun.security.util.MessageDigestSpi2;
+
+import javax.crypto.SecretKey;
 
 /**
  * This MessageDigest class provides applications the functionality of a
@@ -548,7 +551,7 @@
      * and its original parent (Object).
      */
 
-    static class Delegate extends MessageDigest {
+    static class Delegate extends MessageDigest implements MessageDigestSpi2 {
 
         // The provider implementation (delegate)
         private MessageDigestSpi digestSpi;
@@ -601,6 +604,14 @@
             digestSpi.engineUpdate(input);
         }
 
+        public void engineUpdate(SecretKey key) throws InvalidKeyException {
+            if (digestSpi instanceof MessageDigestSpi2) {
+                ((MessageDigestSpi2)digestSpi).engineUpdate(key);
+            } else {
+                throw new UnsupportedOperationException
+                ("Digest does not support update of SecretKey object");
+            }
+        }
         protected byte[] engineDigest() {
             return digestSpi.engineDigest();
         }