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diff --git a/libjava/classpath/javax/crypto/Mac.java b/libjava/classpath/javax/crypto/Mac.java
new file mode 100644
index 000000000..9175e5800
--- /dev/null
+++ b/libjava/classpath/javax/crypto/Mac.java
@@ -0,0 +1,434 @@
+/* Mac.java -- The message authentication code interface.
+   Copyright (C) 2004  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package javax.crypto;
+
+import gnu.java.security.Engine;
+
+import java.lang.reflect.InvocationTargetException;
+import java.nio.ByteBuffer;
+import java.security.InvalidAlgorithmParameterException;
+import java.security.InvalidKeyException;
+import java.security.Key;
+import java.security.NoSuchAlgorithmException;
+import java.security.NoSuchProviderException;
+import java.security.Provider;
+import java.security.Security;
+import java.security.spec.AlgorithmParameterSpec;
+
+/**
+ * This class implements a "message authentication code" (MAC), a method
+ * to ensure the integrity of data transmitted between two parties who
+ * share a common secret key.
+ *
+ * <p>The best way to describe a MAC is as a <i>keyed one-way hash
+ * function</i>, which looks like:
+ *
+ * <blockquote><p><code>D = MAC(K, M)</code></blockquote>
+ *
+ * <p>where <code>K</code> is the key, <code>M</code> is the message,
+ * and <code>D</code> is the resulting digest. One party will usually
+ * send the concatenation <code>M || D</code> to the other party, who
+ * will then verify <code>D</code> by computing <code>D'</code> in a
+ * similar fashion. If <code>D == D'</code>, then the message is assumed
+ * to be authentic.
+ *
+ * @author Casey Marshall (csm@gnu.org)
+ */
+public class Mac implements Cloneable
+{
+
+  // Fields.
+  // ------------------------------------------------------------------------
+
+  private static final String SERVICE = "Mac";
+
+  /** The underlying MAC implementation. */
+  private MacSpi macSpi;
+
+  /** The provider we got our implementation from. */
+  private Provider provider;
+
+  /** The name of the algorithm. */
+  private String algorithm;
+
+  /** Whether or not we've been initialized. */
+  private boolean virgin;
+
+  // Constructor.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Creates a new Mac instance.
+   *
+   * @param macSpi    The underlying MAC implementation.
+   * @param provider  The provider of this implementation.
+   * @param algorithm The name of this MAC algorithm.
+   */
+  protected Mac(MacSpi macSpi, Provider provider, String algorithm)
+  {
+    this.macSpi = macSpi;
+    this.provider = provider;
+    this.algorithm = algorithm;
+    virgin = true;
+  }
+
+  /**
+   * Create an instance of the named algorithm from the first provider with an
+   * appropriate implementation.
+   *
+   * @param algorithm The name of the algorithm.
+   * @return An appropriate Mac instance, if the specified algorithm is
+   *         implemented by a provider.
+   * @throws NoSuchAlgorithmException If no implementation of the named
+   *           algorithm is installed.
+   * @throws IllegalArgumentException if <code>algorithm</code> is
+   *           <code>null</code> or is an empty string.
+   */
+  public static final Mac getInstance(String algorithm)
+      throws NoSuchAlgorithmException
+  {
+    Provider[] p = Security.getProviders();
+    NoSuchAlgorithmException lastException = null;
+    for (int i = 0; i < p.length; i++)
+      try
+        {
+          return getInstance(algorithm, p[i]);
+        }
+      catch (NoSuchAlgorithmException x)
+        {
+          lastException = x;
+        }
+      if (lastException != null)
+        throw lastException;
+      throw new NoSuchAlgorithmException(algorithm);
+  }
+
+  /**
+   * Create an instance of the named algorithm from the named provider.
+   *
+   * @param algorithm The name of the algorithm.
+   * @param provider The name of the provider.
+   * @return An appropriate Mac instance, if the specified algorithm is
+   *         implemented by the named provider.
+   * @throws NoSuchAlgorithmException If the named provider has no
+   *           implementation of the algorithm.
+   * @throws NoSuchProviderException If the named provider does not exist.
+   * @throws IllegalArgumentException if either <code>algorithm</code> or
+   *           <code>provider</code> is <code>null</code>, or if
+   *           <code>algorithm</code> is an empty string.
+   */
+  public static final Mac getInstance(String algorithm, String provider)
+      throws NoSuchAlgorithmException, NoSuchProviderException
+  {
+    if (provider == null)
+      throw new IllegalArgumentException("provider MUST NOT be null");
+    Provider p = Security.getProvider(provider);
+    if (p == null)
+      throw new NoSuchProviderException(provider);
+    return getInstance(algorithm, p);
+  }
+
+  /**
+   * Create an instance of the named algorithm from a provider.
+   *
+   * @param algorithm The name of the algorithm.
+   * @param provider The provider.
+   * @return An appropriate Mac instance, if the specified algorithm is
+   *         implemented by the provider.
+   * @throws NoSuchAlgorithmException If the provider has no implementation of
+   *           the algorithm.
+   * @throws IllegalArgumentException if either <code>algorithm</code> or
+   *           <code>provider</code> is <code>null</code>, or if
+   *           <code>algorithm</code> is an empty string.
+   */
+  public static final Mac getInstance(String algorithm, Provider provider)
+      throws NoSuchAlgorithmException
+  {
+    StringBuilder sb = new StringBuilder("Mac algorithm [")
+        .append(algorithm).append("] from provider[")
+        .append(provider).append("] could not be created");
+    Throwable cause;
+    try
+      {
+        Object spi = Engine.getInstance(SERVICE, algorithm, provider);
+        return new Mac((MacSpi) spi, provider, algorithm);
+      }
+    catch (InvocationTargetException x)
+      {
+        cause = x.getCause();
+        if (cause instanceof NoSuchAlgorithmException)
+          throw (NoSuchAlgorithmException) cause;
+        if (cause == null)
+          cause = x;
+      }
+    catch (ClassCastException x)
+      {
+        cause = x;
+      }
+    NoSuchAlgorithmException x = new NoSuchAlgorithmException(sb.toString());
+    x.initCause(cause);
+    throw x;
+  }
+
+  /**
+   * Finishes the computation of a MAC and returns the digest.
+   *
+   * <p>After this method succeeds, it may be used again as just after a
+   * call to <code>init</code>, and can compute another MAC using the
+   * same key and parameters.
+   *
+   * @return The message authentication code.
+   * @throws java.lang.IllegalStateException If this instnace has not
+   *         been initialized.
+   */
+  public final byte[] doFinal() throws IllegalStateException
+  {
+    if (virgin)
+      {
+        throw new IllegalStateException("not initialized");
+      }
+    byte[] digest = macSpi.engineDoFinal();
+    reset();
+    return digest;
+  }
+
+  /**
+   * Finishes the computation of a MAC with a final byte array (or
+   * computes a MAC over those bytes only) and returns the digest.
+   *
+   * <p>After this method succeeds, it may be used again as just after a
+   * call to <code>init</code>, and can compute another MAC using the
+   * same key and parameters.
+   *
+   * @param input The bytes to add.
+   * @return The message authentication code.
+   * @throws java.lang.IllegalStateException If this instnace has not
+   *         been initialized.
+   */
+  public final byte[] doFinal(byte[] input) throws IllegalStateException
+  {
+    update(input);
+    byte[] digest = macSpi.engineDoFinal();
+    reset();
+    return digest;
+  }
+
+  /**
+   * Finishes the computation of a MAC and places the result into the
+   * given array.
+   *
+   * <p>After this method succeeds, it may be used again as just after a
+   * call to <code>init</code>, and can compute another MAC using the
+   * same key and parameters.
+   *
+   * @param output    The destination for the result.
+   * @param outOffset The index in the output array to start.
+   * @return The message authentication code.
+   * @throws java.lang.IllegalStateException If this instnace has not
+   *         been initialized.
+   * @throws javax.crypto.ShortBufferException If <code>output</code> is
+   *         not large enough to hold the result.
+   */
+  public final void doFinal(byte[] output, int outOffset)
+  throws IllegalStateException, ShortBufferException
+  {
+    if (virgin)
+      {
+        throw new IllegalStateException("not initialized");
+      }
+    if (output.length - outOffset < getMacLength())
+      {
+        throw new ShortBufferException();
+      }
+    byte[] mac = macSpi.engineDoFinal();
+    System.arraycopy(mac, 0, output, outOffset, getMacLength());
+    reset();
+  }
+
+  /**
+   * Returns the name of this MAC algorithm.
+   *
+   * @return The MAC name.
+   */
+  public final String getAlgorithm()
+  {
+    return algorithm;
+  }
+
+  /**
+   * Get the size of the MAC. This is the size of the array returned by
+   * {@link #doFinal()} and {@link #doFinal(byte[])}, and the minimum
+   * number of bytes that must be available in the byte array passed to
+   * {@link #doFinal(byte[],int)}.
+   *
+   * @return The MAC length.
+   */
+  public final int getMacLength()
+  {
+    return macSpi.engineGetMacLength();
+  }
+
+  /**
+   * Get the provider of the underlying implementation.
+   *
+   * @return The provider.
+   */
+  public final Provider getProvider()
+  {
+    return provider;
+  }
+
+  /**
+   * Initialize this MAC with a key and no parameters.
+   *
+   * @param key The key to initialize this instance with.
+   * @throws java.security.InvalidKeyException If the key is
+   *         unacceptable.
+   */
+  public final void init(Key key) throws InvalidKeyException
+  {
+    try
+      {
+        init(key, null);
+      }
+    catch (InvalidAlgorithmParameterException iape)
+      {
+        throw new IllegalArgumentException(algorithm + " needs parameters");
+      }
+  }
+
+  /**
+   * Initialize this MAC with a key and parameters.
+   *
+   * @param key    The key to initialize this instance with.
+   * @param params The algorithm-specific parameters.
+   * @throws java.security.InvalidAlgorithmParameterException If the
+   *         algorithm parameters are unacceptable.
+   * @throws java.security.InvalidKeyException If the key is
+   *         unacceptable.
+   */
+  public final void init(Key key, AlgorithmParameterSpec params)
+    throws InvalidAlgorithmParameterException, InvalidKeyException
+  {
+    macSpi.engineInit(key, params);
+    virgin = false;                      // w00t!
+  }
+
+  /**
+   * Reset this instance. A call to this method returns this instance
+   * back to the state it was in just after it was initialized.
+   */
+  public final void reset()
+  {
+    macSpi.engineReset();
+  }
+
+  /**
+   * Update the computation with a single byte.
+   *
+   * @param input The next byte.
+   * @throws java.lang.IllegalStateException If this instance has not
+   *         been initialized.
+   */
+  public final void update(byte input) throws IllegalStateException
+  {
+    if (virgin)
+      {
+        throw new IllegalStateException("not initialized");
+      }
+    macSpi.engineUpdate(input);
+  }
+
+  /**
+   * Update the computation with a byte array.
+   *
+   * @param input The next bytes.
+   * @throws java.lang.IllegalStateException If this instance has not
+   *         been initialized.
+   */
+  public final void update(byte[] input) throws IllegalStateException
+  {
+    update(input, 0, input.length);
+  }
+
+  /**
+   * Update the computation with a portion of a byte array.
+   *
+   * @param input  The next bytes.
+   * @param offset The index in <code>input</code> to start.
+   * @param length The number of bytes to update.
+   * @throws java.lang.IllegalStateException If this instance has not
+   *         been initialized.
+   */
+  public final void update(byte[] input, int offset, int length)
+    throws IllegalStateException
+  {
+    if (virgin)
+      {
+        throw new IllegalStateException("not initialized");
+      }
+    macSpi.engineUpdate(input, offset, length);
+  }
+
+  /**
+   * Update this MAC with the remaining bytes in the given buffer
+   * @param buffer The input buffer.
+   * @since 1.5
+   */
+  public final void update (final ByteBuffer buffer)
+  {
+    if (virgin)
+      throw new IllegalStateException ("not initialized");
+    macSpi.engineUpdate(buffer);
+  }
+
+  /**
+   * Clone this instance, if the underlying implementation supports it.
+   *
+   * @return A clone of this instance.
+   * @throws java.lang.CloneNotSupportedException If the underlying
+   *         implementation is not cloneable.
+   */
+  public final Object clone() throws CloneNotSupportedException
+  {
+    Mac result = new Mac((MacSpi) macSpi.clone(), provider, algorithm);
+    result.virgin = virgin;
+    return result;
+  }
+}