src/java.base/share/classes/java/security/MessageDigest.java

@@ -30,15 +30,18 @@
 import java.io.IOException;
 import java.io.ByteArrayOutputStream;
 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
  * message digest algorithm, such as SHA-1 or SHA-256.
  * Message digests are secure one-way hash functions that take arbitrary-sized
  * data and output a fixed-length hash value.

@@ -546,11 +549,11 @@
      * moved up the hierarchy into a new class (MessageDigestSpi), which has
      * been interposed in the hierarchy between the API (MessageDigest)
      * and its original parent (Object).
      */
 
-    static class Delegate extends MessageDigest {
+    static class Delegate extends MessageDigest implements MessageDigestSpi2 {
 
         // The provider implementation (delegate)
         private MessageDigestSpi digestSpi;
 
         // constructor

@@ -599,10 +602,18 @@
 
         protected void engineUpdate(ByteBuffer input) {
             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();
         }
 
         protected int engineDigest(byte[] buf, int offset, int len)