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diff --git a/libjava/javax/security/cert/Certificate.java b/libjava/javax/security/cert/Certificate.java
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+/* Certificate.java -- base class of public-key certificates.
+   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., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 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.security.cert;
+
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.security.NoSuchProviderException;
+import java.security.PublicKey;
+import java.security.SignatureException;
+
+import java.util.Arrays;
+import java.util.zip.Adler32;
+
+/**
+ * <p>The base class for public-key certificates.</p>
+ *
+ * <p><b>This class is deprecated in favor of the {@link
+ * java.security.cert.Certificate} class. It should not be used in new
+ * applications.</b></p>
+ */
+public abstract class Certificate
+{
+
+  // Constructors.
+  // -------------------------------------------------------------------------
+
+  public Certificate()
+  {
+    super();
+  }
+
+  // Instance methods.
+  // -------------------------------------------------------------------------
+
+  /**
+   * <p>Tests if this certificate equals another.</p>
+   *
+   * @param other The object to test.
+   * @return True if the certificates are equal.
+   */
+  public boolean equals(Object other)
+  {
+    if (other == null || !(other instanceof Certificate))
+      {
+        return false;
+      }
+    if (other == this)
+      {
+        return true;
+      }
+    try
+      {
+        return Arrays.equals(getEncoded(), ((Certificate) other).getEncoded());
+      }
+    catch (CertificateEncodingException cee)
+      {
+        return false;
+      }
+  }
+
+  /**
+   * <p>Computes a hash code for this certificate.</p>
+   *
+   * @return The hash code.
+   */
+  public int hashCode()
+  {
+    try
+      {
+        Adler32 csum = new Adler32();
+        csum.update(getEncoded());
+        return (int) csum.getValue();
+      }
+    catch (CertificateEncodingException cee)
+      {
+        return 0;
+      }
+  }
+
+  // Abstract methods.
+  // -------------------------------------------------------------------------
+
+  /**
+   * <p>Return the encoded form of this certificate.</p>
+   *
+   * @return The encoded form.
+   * @throws CertificateEncodingException If the certificate could not be
+   *   encoded.
+   */
+  public abstract byte[] getEncoded() throws CertificateEncodingException;
+
+  /**
+   * <p>Verifies the signature of this certificate.</p>
+   *
+   * @param key The signer's public key.
+   * @throws CertificateException
+   * @throws NoSuchAlgorithmException If the algorithm used to sign the
+   *   certificate is not available.
+   * @throws InvalidKeyException If the supplied key is not appropriate for the
+   *   certificate's signature algorithm.
+   * @throws NoSuchProviderException
+   * @throws SignatureException If the signature could not be verified.
+   */
+  public abstract void verify(PublicKey key)
+    throws CertificateException, NoSuchAlgorithmException, InvalidKeyException,
+           NoSuchProviderException, SignatureException;
+
+  /**
+   * <p>Verifies the signature of this certificate, using the specified security
+   * provider.</p>
+   *
+   * @param key The signer's public key.
+   * @param sigProvider The name of the signature provider.
+   * @throws CertificateException
+   * @throws NoSuchAlgorithmException If the algorithm used to sign the
+   *   certificate is not available.
+   * @throws InvalidKeyException If the supplied key is not appropriate for the
+   *   certificate's signature algorithm.
+   * @throws NoSuchProviderException If <i>sigProvider</i> is not the name of an
+   *   installed provider.
+   * @throws SignatureException If the signature could not be verified.
+   */
+  public abstract void verify(PublicKey key, String sigProvider)
+    throws CertificateException, NoSuchAlgorithmException, InvalidKeyException,
+           NoSuchProviderException, SignatureException;
+
+  /**
+   * <p>Returns a printable representation of this certificate.</p>
+   *
+   * @return The string.
+   */
+  public abstract String toString();
+
+  /**
+   * <p>Returns this certificate's public key.</p>
+   *
+   * @return The public key.
+   */
+  public abstract PublicKey getPublicKey();
+}