--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/javax/crypto/Mac/ByteBuffers.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2003-2007 Sun Microsystems, Inc.  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.
+ *
+ * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/**
+ * @test
+ * @bug 4844847
+ * @summary Test the Mac.update(ByteBuffer) method
+ * @author Andreas Sterbenz
+ */
+
+import java.util.*;
+import java.nio.*;
+
+import java.security.*;
+
+import javax.crypto.*;
+import javax.crypto.spec.*;
+
+public class ByteBuffers {
+
+    public static void main(String[] args) throws Exception {
+        Provider p = Security.getProvider("SunJCE");
+        Random random = new Random();
+        int n = 10 * 1024;
+        byte[] t = new byte[n];
+        random.nextBytes(t);
+
+        byte[] keyBytes = new byte[16];
+        random.nextBytes(keyBytes);
+        SecretKey key = new SecretKeySpec(keyBytes, "HmacMD5");
+
+        Mac mac = Mac.getInstance("HmacMD5");
+        mac.init(key);
+        byte[] macValue = mac.doFinal(t);
+
+        // test 1: ByteBuffer with an accessible backing array
+        ByteBuffer b1 = ByteBuffer.allocate(n + 256);
+        b1.position(random.nextInt(256));
+        b1.limit(b1.position() + n);
+        ByteBuffer b2 = b1.slice();
+        b2.put(t);
+        b2.clear();
+        verify(mac, macValue, b2, random);
+
+        // test 2: direct ByteBuffer
+        ByteBuffer b3 = ByteBuffer.allocateDirect(t.length);
+        b3.put(t);
+        b3.clear();
+        verify(mac, macValue, b3, random);
+
+        // test 3: ByteBuffer without an accessible backing array
+        b2.clear();
+        ByteBuffer b4 = b2.asReadOnlyBuffer();
+        verify(mac, macValue, b4, random);
+
+        System.out.println("All tests passed");
+    }
+
+    private static void verify(Mac mac, byte[] macValue, ByteBuffer b, Random random) throws Exception {
+        int lim = b.limit();
+        b.limit(random.nextInt(lim));
+        mac.update(b);
+        if (b.hasRemaining()) {
+            throw new Exception("Buffer not consumed");
+        }
+        b.limit(lim);
+        mac.update(b);
+        if (b.hasRemaining()) {
+            throw new Exception("Buffer not consumed");
+        }
+        byte[] newMacValue = mac.doFinal();
+        if (Arrays.equals(macValue, newMacValue) == false) {
+            throw new Exception("Mac did not verify");
+        }
+    }
+}