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diff --git a/libjava/classpath/java/security/Signature.java b/libjava/classpath/java/security/Signature.java
new file mode 100644
index 000000000..d7186395f
--- /dev/null
+++ b/libjava/classpath/java/security/Signature.java
@@ -0,0 +1,593 @@
+/* Signature.java --- Signature Class
+   Copyright (C) 1999, 2002, 2003, 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 java.security;
+
+import gnu.java.lang.CPStringBuilder;
+
+import gnu.java.security.Engine;
+
+import java.lang.reflect.InvocationTargetException;
+import java.nio.ByteBuffer;
+import java.security.cert.Certificate;
+import java.security.cert.X509Certificate;
+import java.security.spec.AlgorithmParameterSpec;
+
+/**
+ * <code>Signature</code> is used to provide an interface to digital signature
+ * algorithms. Digital signatures provide authentication and data integrity of
+ * digital data.
+ *
+ * <p>The GNU provider provides the NIST standard DSA which uses DSA and SHA-1.
+ * It can be specified by SHA/DSA, SHA-1/DSA or its OID. If the RSA signature
+ * algorithm is provided then it could be MD2/RSA. MD5/RSA, or SHA-1/RSA. The
+ * algorithm must be specified because there is no default.</p>
+ *
+ * <p>Signature provides implementation-independent algorithms which are
+ * requested by the user through the <code>getInstance()<?code> methods. It can
+ * be requested by specifying just the algorithm name or by specifying both the
+ * algorithm name and provider name.</p>
+ *
+ * <p>The three phases of using <code>Signature</code> are:</p>
+ *
+ * <ol>
+ *   <li>Initializing:
+ *     <ul>
+ *       <li>It must be initialized with a private key for signing.</li>
+ *       <li>It must be initialized with a public key for verifying.</li>
+ *   </li>
+ *
+ *   <li>Updating:
+ *   <p>Update the bytes for signing or verifying with calls to update.</p>
+ *   </li>
+ *
+ *   <li>Signing or Verify the signature on the currently stored bytes by
+ *   calling sign or verify.</li>
+ * </ol>
+ *
+ * @author Mark Benvenuto  (ivymccough@worldnet.att.net)
+ */
+public abstract class Signature extends SignatureSpi
+{
+  /** Service name for signatures. */
+  private static final String SIGNATURE = "Signature";
+
+  /**
+   * Possible state value which signifies that this instance has not yet been
+   * initialized.
+   */
+  protected static final int UNINITIALIZED = 0;
+
+  /**
+   * Possible state value which signifies that this instance has been
+   * initialized for signing purposes.
+   */
+  protected static final int SIGN = 2;
+
+  /**
+   * Possible state value which signifies that this instance has been
+   * initialized for verification purposes.
+   */
+  protected static final int VERIFY = 3;
+
+  /** Current sate of this instance. */
+  protected int state = UNINITIALIZED;
+
+  private String algorithm;
+  Provider provider;
+
+  // Constructor.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Constructs a new <code>Signature</code> instance for a designated digital
+   * signature algorithm.
+   *
+   * @param algorithm
+   *          the algorithm to use.
+   */
+  protected Signature(String algorithm)
+  {
+    this.algorithm = algorithm;
+    state = UNINITIALIZED;
+  }
+
+  /**
+   * Returns an instance of <code>Signature</code> representing the specified
+   * signature.
+   *
+   * @param algorithm the algorithm to use.
+   * @return a new instance repesenting the desired algorithm.
+   * @throws NoSuchAlgorithmException if the algorithm is not implemented by any
+   *           provider.
+   * @throws IllegalArgumentException if <code>algorithm</code> is
+   *           <code>null</code> or is an empty string.
+   */
+  public static Signature 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);
+  }
+
+  /**
+   * Returns an instance of <code>Signature</code> representing the specified
+   * signature from the named provider.
+   *
+   * @param algorithm the algorithm to use.
+   * @param provider the name of the provider to use.
+   * @return a new instance repesenting the desired algorithm.
+   * @throws NoSuchProviderException if the named provider was not found.
+   * @throws NoSuchAlgorithmException if the algorithm is not implemented by the
+   *           named provider.
+   * @throws IllegalArgumentException if either <code>algorithm</code> or
+   *           <code>provider</code> is <code>null</code> or empty.
+   */
+  public static Signature getInstance(String algorithm, String provider)
+      throws NoSuchAlgorithmException, NoSuchProviderException
+  {
+    if (provider == null)
+      throw new IllegalArgumentException("provider MUST NOT be null");
+    provider = provider.trim();
+    if (provider.length() == 0)
+      throw new IllegalArgumentException("provider MUST NOT be empty");
+    Provider p = Security.getProvider(provider);
+    if (p == null)
+      throw new NoSuchProviderException(provider);
+    return getInstance(algorithm, p);
+  }
+
+  /**
+   * Returns an instance of <code>Signature</code> representing the specified
+   * signature from the specified {@link Provider}.
+   *
+   * @param algorithm the algorithm to use.
+   * @param provider the {@link Provider} to use.
+   * @return a new instance repesenting the desired algorithm.
+   * @throws NoSuchAlgorithmException if the algorithm is not implemented by the
+   *           {@link Provider}.
+   * @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 Signature getInstance(String algorithm, Provider provider)
+    throws NoSuchAlgorithmException
+  {
+    CPStringBuilder sb = new CPStringBuilder("Signature algorithm [")
+        .append(algorithm).append("] from provider[")
+        .append(provider).append("] ");
+    Object o;
+    try
+      {
+        o = Engine.getInstance(SIGNATURE, algorithm, provider);
+      }
+    catch (InvocationTargetException x)
+      {
+        Throwable cause = x.getCause();
+        if (cause instanceof NoSuchAlgorithmException)
+          throw (NoSuchAlgorithmException) cause;
+        if (cause == null)
+          cause = x;
+        sb.append("could not be created");
+        NoSuchAlgorithmException y = new NoSuchAlgorithmException(sb.toString());
+        y.initCause(cause);
+        throw y;
+      }
+    Signature result;
+    if (o instanceof SignatureSpi)
+      result = new DummySignature((SignatureSpi) o, algorithm);
+    else if (o instanceof Signature)
+      {
+        result = (Signature) o;
+        result.algorithm = algorithm;
+      }
+    else
+      {
+        sb.append("is of an unexpected Type: ").append(o.getClass().getName());
+        throw new NoSuchAlgorithmException(sb.toString());
+      }
+    result.provider = provider;
+    return result;
+  }
+
+  /**
+   * Returns the {@link Provider} of this instance.
+   *
+   * @return the {@link Provider} of this instance.
+   */
+  public final Provider getProvider()
+  {
+    return provider;
+  }
+
+  /**
+   * Initializes this instance with the public key for verification purposes.
+   *
+   * @param publicKey
+   *          the public key to verify with.
+   * @throws InvalidKeyException
+   *           if the key is invalid.
+   */
+  public final void initVerify(PublicKey publicKey) throws InvalidKeyException
+  {
+    state = VERIFY;
+    engineInitVerify(publicKey);
+  }
+
+  /**
+   * Verify a signature with a designated {@link Certificate}. This is a FIPS
+   * 140-1 compatible method since it verifies a signature with a certificate.
+   *
+   * <p>If the {@link Certificate} is an X.509 one, has a <i>KeyUsage</i>
+   * parameter and that parameter indicates this key is not to be used for
+   * signing then an exception is thrown.</p>
+   *
+   * @param certificate
+   *          a {@link Certificate} containing a public key to verify with.
+   * @throws InvalidKeyException if the key is invalid.
+   */
+  public final void initVerify(Certificate certificate)
+    throws InvalidKeyException
+  {
+    state = VERIFY;
+    if (certificate.getType().equals("X509"))
+      {
+        X509Certificate cert = (X509Certificate) certificate;
+        boolean[]array = cert.getKeyUsage();
+        if (array != null && array[0] == false)
+          throw new InvalidKeyException(
+              "KeyUsage of this Certificate indicates it cannot be used for digital signing");
+      }
+    this.initVerify(certificate.getPublicKey());
+  }
+
+  /**
+   * Initializes this class with the private key for signing purposes.
+   *
+   * @param privateKey
+   *          the private key to sign with.
+   * @throws InvalidKeyException
+   *           if the key is invalid.
+   */
+  public final void initSign(PrivateKey privateKey) throws InvalidKeyException
+  {
+    state = SIGN;
+    engineInitSign(privateKey);
+  }
+
+  /**
+   * Initializes this class with the private key and source of randomness for
+   * signing purposes.
+   *
+   * @param privateKey
+   *          the private key to sign with.
+   * @param random
+   *          the {@link SecureRandom} to use.
+   * @throws InvalidKeyException
+   *           if the key is invalid.
+   */
+  public final void initSign(PrivateKey privateKey, SecureRandom random)
+    throws InvalidKeyException
+  {
+    state = SIGN;
+    engineInitSign(privateKey, random);
+  }
+
+  /**
+   * Returns the signature bytes of all the data fed to this instance. The
+   * format of the output depends on the underlying signature algorithm.
+   *
+   * @return the signature bytes.
+   * @throws SignatureException
+   *           if the engine is not properly initialized.
+   */
+  public final byte[] sign() throws SignatureException
+  {
+    if (state == SIGN)
+      return engineSign();
+    else
+      throw new SignatureException();
+  }
+
+  /**
+   * Generates signature bytes of all the data fed to this instance and stores
+   * it in the designated array. The format of the result depends on the
+   * underlying signature algorithm.
+   *
+   * <p>After calling this method, the instance is reset to its initial state
+   * and can then be used to generate additional signatures.</p>
+   *
+   * <p><b>IMPLEMENTATION NOTE:</b> Neither this method nor the GNU provider
+   * will return partial digests. If <code>len</code> is less than the
+   * signature length, this method will throw a {@link SignatureException}. If
+   * it is greater than or equal then it is ignored.</p>
+   *
+   * @param outbuf
+   *          array of bytes of where to store the resulting signature bytes.
+   * @param offset
+   *          the offset to start at in the array.
+   * @param len
+   *          the number of the bytes to use in the array.
+   * @return the real number of bytes used.
+   * @throws SignatureException
+   *           if the engine is not properly initialized.
+   * @since 1.2
+   */
+  public final int sign(byte[] outbuf, int offset, int len)
+    throws SignatureException
+  {
+    if (state == SIGN)
+      return engineSign(outbuf, offset, len);
+    else
+      throw new SignatureException();
+  }
+
+  /**
+   * Verifies a designated signature.
+   *
+   * @param signature
+   *          the signature bytes to verify.
+   * @return <code>true</code> if verified, <code>false</code> otherwise.
+   * @throws SignatureException
+   *           if the engine is not properly initialized or the signature does
+   *           not check.
+   */
+  public final boolean verify(byte[]signature) throws SignatureException
+  {
+    if (state == VERIFY)
+      return engineVerify(signature);
+    else
+      throw new SignatureException();
+  }
+
+  /**
+   * Verifies a designated signature.
+   *
+   * @param signature
+   *          the signature bytes to verify.
+   * @param offset
+   *          the offset to start at in the array.
+   * @param length
+   *          the number of the bytes to use from the array.
+   * @return <code>true</code> if verified, <code>false</code> otherwise.
+   * @throws IllegalArgumentException
+   *           if the <code>signature</code> byte array is <code>null</code>,
+   *           or the <code>offset</code> or <code>length</code> is less
+   *           than <code>0</code>, or the sum of the <code>offset</code>
+   *           and <code>length</code> is greater than the length of the
+   *           <code>signature</code> byte array.
+   * @throws SignatureException
+   *           if the engine is not properly initialized or the signature does
+   *           not check.
+   */
+  public final boolean verify(byte[] signature, int offset, int length)
+    throws SignatureException
+  {
+    if (state != VERIFY)
+      throw new SignatureException("illegal state");
+
+    if (signature == null)
+      throw new IllegalArgumentException("signature is null");
+    if (offset < 0)
+      throw new IllegalArgumentException("offset is less than 0");
+    if (length < 0)
+      throw new IllegalArgumentException("length is less than 0");
+    if (offset + length < signature.length)
+      throw new IllegalArgumentException("range is out of bounds");
+
+    return engineVerify(signature, offset, length);
+  }
+
+  /**
+   * Updates the data to be signed or verified with the specified byte.
+   *
+   * @param b
+   *          the byte to update with.
+   * @throws SignatureException
+   *           if the engine is not properly initialized.
+   */
+  public final void update(byte b) throws SignatureException
+  {
+    if (state != UNINITIALIZED)
+      engineUpdate(b);
+    else
+      throw new SignatureException();
+  }
+
+  /**
+   * Updates the data to be signed or verified with the specified bytes.
+   *
+   * @param data
+   *          the array of bytes to use.
+   * @throws SignatureException
+   *           if the engine is not properly initialized.
+   */
+  public final void update(byte[]data) throws SignatureException
+  {
+    if (state != UNINITIALIZED)
+      engineUpdate(data, 0, data.length);
+    else
+      throw new SignatureException();
+  }
+
+  /**
+   * Updates the data to be signed or verified with the specified bytes.
+   *
+   * @param data
+   *          an array of bytes to use.
+   * @param off
+   *          the offset to start at in the array.
+   * @param len
+   *          the number of bytes to use from the array.
+   * @throws SignatureException
+   *           if the engine is not properly initialized.
+   */
+  public final void update(byte[]data, int off, int len)
+    throws SignatureException
+  {
+    if (state != UNINITIALIZED)
+      engineUpdate(data, off, len);
+    else
+      throw new SignatureException();
+  }
+
+  /**
+   * Update this signature with the {@link java.nio.Buffer#remaining()}
+   * bytes of the input buffer.
+   *
+   * @param input The input buffer.
+   * @throws SignatureException If this instance was not properly
+   *  initialized.
+   */
+  public final void update(ByteBuffer input) throws SignatureException
+  {
+    if (state != UNINITIALIZED)
+      engineUpdate(input);
+    else
+      throw new SignatureException("not initialized");
+  }
+
+  /**
+   * Returns the name of the algorithm currently used. The names of algorithms
+   * are usually SHA/DSA or SHA/RSA.
+   *
+   * @return name of algorithm.
+   */
+  public final String getAlgorithm()
+  {
+    return algorithm;
+  }
+
+  /**
+   * Returns a rstring representation of this instance.
+   *
+   * @return a rstring representation of this instance.
+   */
+  public String toString()
+  {
+    return (algorithm + " Signature");
+  }
+
+  /**
+   * Sets the specified algorithm parameter to the specified value.
+   *
+   * @param param
+   *          the parameter name.
+   * @param value
+   *          the parameter value.
+   * @throws InvalidParameterException
+   *           if the parameter is invalid, the parameter is already set and
+   *           can not be changed, a security exception occured, etc.
+   * @deprecated use the other setParameter
+   */
+  public final void setParameter(String param, Object value)
+    throws InvalidParameterException
+  {
+    engineSetParameter(param, value);
+  }
+
+  /**
+   * Sets the signature engine with the specified {@link AlgorithmParameterSpec}.
+   *
+   * <p>By default, and unless overriden by the concrete SPI, this method always
+   * throws an {@link UnsupportedOperationException}.</p>
+   *
+   * @param params
+   *          the parameters to use for intializing this instance.
+   * @throws InvalidParameterException
+   *           if the parameter is invalid, the parameter is already set and
+   *           cannot be changed, a security exception occured, etc.
+   */
+  public final void setParameter(AlgorithmParameterSpec params)
+    throws InvalidAlgorithmParameterException
+  {
+    engineSetParameter(params);
+  }
+
+  /**
+   * Return the parameters of the algorithm used in this instance as an
+   * {@link AlgorithmParameters}.
+   *
+   * @return the parameters used with this instance, or <code>null</code> if
+   *         this instance does not use any parameters.
+   */
+  public final AlgorithmParameters getParameters()
+  {
+    return engineGetParameters();
+  }
+
+  /**
+   * Returns the value for the specified algorithm parameter.
+   *
+   * @param param
+   *          the parameter name.
+   * @return the parameter value.
+   * @throws InvalidParameterException
+   *           if the parameter is invalid.
+   * @deprecated use the other getParameter
+   */
+  public final Object getParameter(String param)
+    throws InvalidParameterException
+  {
+    return engineGetParameter(param);
+  }
+
+  /**
+   * Returns a clone of this instance.
+   *
+   * @return a clone of this instace.
+   * @throws CloneNotSupportedException
+   *           if the implementation does not support cloning.
+   */
+  public Object clone() throws CloneNotSupportedException
+  {
+    return super.clone();
+  }
+}