--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/share/classes/com/sun/crypto/provider/HmacMD5KeyGenerator.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 1999, 2013, 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 com.sun.crypto.provider;
+
+import java.security.SecureRandom;
+import java.security.InvalidParameterException;
+import java.security.InvalidAlgorithmParameterException;
+import java.security.spec.AlgorithmParameterSpec;
+import javax.crypto.KeyGeneratorSpi;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.SecretKeySpec;
+
+/**
+ * This class generates a secret key for use with the HMAC-MD5 algorithm.
+ *
+ * @author Jan Luehe
+ *
+ */
+
+public final class HmacMD5KeyGenerator extends KeyGeneratorSpi {
+
+    private SecureRandom random = null;
+    private int keysize = 64; // default keysize (in number of bytes)
+
+    /**
+     * Empty constructor
+     */
+    public HmacMD5KeyGenerator() {
+    }
+
+    /**
+     * Initializes this key generator.
+     *
+     * @param random the source of randomness for this generator
+     */
+    protected void engineInit(SecureRandom random) {
+        this.random = random;
+    }
+
+    /**
+     * Initializes this key generator with the specified parameter
+     * set and a user-provided source of randomness.
+     *
+     * @param params the key generation parameters
+     * @param random the source of randomness for this key generator
+     *
+     * @exception InvalidAlgorithmParameterException if <code>params</code> is
+     * inappropriate for this key generator
+     */
+    protected void engineInit(AlgorithmParameterSpec params,
+                              SecureRandom random)
+        throws InvalidAlgorithmParameterException
+    {
+        throw new InvalidAlgorithmParameterException
+            ("HMAC-MD5 key generation does not take any parameters");
+    }
+
+    /**
+     * Initializes this key generator for a certain keysize, using the given
+     * source of randomness.
+     *
+     * @param keysize the keysize. This is an algorithm-specific
+     * metric specified in number of bits.
+     * @param random the source of randomness for this key generator
+     */
+    protected void engineInit(int keysize, SecureRandom random) {
+        this.keysize = (keysize+7) / 8;
+        this.engineInit(random);
+    }
+
+    /**
+     * Generates an HMAC-MD5 key.
+     *
+     * @return the new HMAC-MD5 key
+     */
+    protected SecretKey engineGenerateKey() {
+        if (this.random == null) {
+            this.random = SunJCE.getRandom();
+        }
+
+        byte[] keyBytes = new byte[this.keysize];
+        this.random.nextBytes(keyBytes);
+
+        return new SecretKeySpec(keyBytes, "HmacMD5");
+    }
+}