--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/share/classes/sun/security/ssl/SSLBasicKeyDerivation.java	Fri May 11 15:53:12 2018 -0700
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2018, 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 sun.security.ssl;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.security.GeneralSecurityException;
+import java.security.spec.AlgorithmParameterSpec;
+import javax.crypto.SecretKey;
+import javax.net.ssl.SSLHandshakeException;
+
+final class SSLBasicKeyDerivation implements SSLKeyDerivation {
+    private final String hashAlg;
+    private final SecretKey secret;
+    private final byte[] hkdfInfo;
+
+    SSLBasicKeyDerivation(SecretKey secret, String hashAlg,
+            byte[] label, byte[] context, int length) {
+        this.hashAlg = hashAlg.replace("-", "");
+        this.secret = secret;
+        this.hkdfInfo = createHkdfInfo(label, context, length);
+    }
+
+    @Override
+    public SecretKey deriveKey(String algorithm,
+            AlgorithmParameterSpec keySpec) throws IOException {
+        try {
+            HKDF hkdf = new HKDF(hashAlg);
+            return hkdf.expand(secret, hkdfInfo,
+                    ((SecretSizeSpec)keySpec).length, algorithm);
+        } catch (GeneralSecurityException gse) {
+            throw (SSLHandshakeException) new SSLHandshakeException(
+                "Could not generate secret").initCause(gse);
+        }
+    }
+
+    private static byte[] createHkdfInfo(
+            byte[] label, byte[] context, int length) {
+        byte[] info = new byte[4 + label.length + context.length];
+        ByteBuffer m = ByteBuffer.wrap(info);
+        try {
+            Record.putInt16(m, length);
+            Record.putBytes8(m, label);
+            Record.putBytes8(m, context);
+        } catch (IOException ioe) {
+            // unlikely
+        }
+        return info;
+    }
+
+    static class SecretSizeSpec implements AlgorithmParameterSpec {
+        final int length;
+
+        SecretSizeSpec(int length) {
+            this.length = length;
+        }
+    }
+}