diff --git a/src/share/classes/com/sun/crypto/provider/DHParameterGenerator.java b/src/share/classes/com/sun/crypto/provider/DHParameterGenerator.java
--- openjdk/jdk/src/share/classes/com/sun/crypto/provider/DHParameterGenerator.java
+++ openjdk/jdk/src/share/classes/com/sun/crypto/provider/DHParameterGenerator.java
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014 Red Hat Inc.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -61,13 +62,13 @@
 
     private static void checkKeySize(int keysize)
             throws InvalidParameterException {
-        boolean supported = ((keysize == 2048) || (keysize == 3072) ||
+        boolean supported = ((keysize == 2048) || (keysize == 3072) || (keysize == 4096) ||
             ((keysize >= 512) && (keysize <= 1024) && ((keysize & 0x3F) == 0)));
 
         if (!supported) {
             throw new InvalidParameterException(
                     "DH key size must be multiple of 64 and range " +
-                    "from 512 to 1024 (inclusive), or 2048, 3072. " +
+                    "from 512 to 1024 (inclusive), or 2048, 3072, 4096. " +
                     "The specific key size " + keysize + " is not supported");
         }
     }
diff --git a/test/com/sun/crypto/provider/KeyAgreement/TestExponentSize.java b/test/com/sun/crypto/provider/KeyAgreement/TestExponentSize.java
--- openjdk/jdk/test/com/sun/crypto/provider/KeyAgreement/TestExponentSize.java
+++ openjdk/jdk/test/com/sun/crypto/provider/KeyAgreement/TestExponentSize.java
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2005, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014 Red Hat Inc.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -58,7 +59,7 @@
      */
     private enum Sizes {
         two56(256), three84(384), five12(512), seven68(768), ten24(1024),
-        twenty48(2048);
+        twenty48(2048), forty96(4096);
 
         private final int intSize;
         private final BigInteger bigIntValue;
@@ -130,6 +131,19 @@
         kp = kpg.generateKeyPair();
         checkKeyPair(kp, Sizes.twenty48, Sizes.five12);
 
+        kpg.initialize(Sizes.forty96.getIntSize());
+        kp = kpg.generateKeyPair();
+        checkKeyPair(kp, Sizes.forty96, Sizes.twenty48);
+
+        publicKey = (DHPublicKey)kp.getPublic();
+        p = publicKey.getParams().getP();
+        g = publicKey.getParams().getG();
+
+        // test w/ all values specified
+        kpg.initialize(new DHParameterSpec(p, g, Sizes.ten24.getIntSize()));
+        kp = kpg.generateKeyPair();
+        checkKeyPair(kp, Sizes.forty96, Sizes.ten24);
+
         System.out.println("OK");
     }