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diff --git a/libjava/java/security/cert/Certificate.java b/libjava/java/security/cert/Certificate.java
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+/* Certificate.java --- Certificate class
+   Copyright (C) 1999 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.
+
+As a special exception, if you link this library with other files to
+produce an executable, this library does not by itself cause the
+resulting executable to be covered by the GNU General Public License.
+This exception does not however invalidate any other reasons why the
+executable file might be covered by the GNU General Public License. */
+
+
+package java.security.cert;
+import java.security.PublicKey;
+import java.security.NoSuchAlgorithmException;
+import java.security.InvalidKeyException;
+import java.security.NoSuchProviderException;
+import java.security.SignatureException;
+import java.io.ObjectInputStream;
+import java.io.ByteArrayInputStream;
+import java.io.ObjectStreamException;
+
+/**
+   The Certificate class is an abstract class used to manage 
+   identity certificates. An identity certificate is a
+   combination of a principal and a public key which is 
+   certified by another principal. This is the puprose of 
+   Certificate Authorities (CA).
+   
+   This class is used to manage different types of certificates
+   but have important common puposes. Different types of 
+   certificates like X.509 and OpenPGP share general certificate
+   functions (like encoding and verifying) and information like
+   public keys.
+   
+   X.509, OpenPGP, and SDSI can be implemented by subclassing this
+   class even though they differ in storage methods and information
+   stored.
+   
+   @since JDK 1.2
+   
+   @author Mark Benvenuto
+*/
+public abstract class Certificate
+{
+
+  private String type;
+  /**
+     Constructs a new certificate of the specified type. An example
+     is "X.509".
+
+     @param type a valid standard name for a certificate.
+  */
+  protected Certificate(String type)
+  {
+    this.type = type;
+  }
+
+  /**
+     Returns the Certificate type.
+
+     @return a string representing the Certificate type
+  */
+  public final String getType()
+  {
+    return type;
+  }
+
+  /**
+     Compares this Certificate to other. It checks if the
+     object if instanceOf Certificate and then checks if
+     the encoded form matches.
+
+     @param other An Object to test for equality
+
+     @return true if equal, false otherwise
+  */
+  public boolean equals(Object other)
+  {
+    if( other instanceof Certificate ) {
+      try {
+	Certificate x = (Certificate) other;
+	if( getEncoded().length != x.getEncoded().length )
+	  return false;
+
+	byte b1[] = getEncoded();
+	byte b2[] = x.getEncoded();
+
+	for( int i = 0; i < b1.length; i++ )
+	  if( b1[i] != b2[i] )
+	    return false;
+
+      } catch( CertificateEncodingException cee ) { 
+	return false;
+      }
+      return true;
+    }
+    return false;
+  }
+
+  /**
+     Returns a hash code for this Certificate in its encoded
+     form.
+
+     @return A hash code of this class
+  */
+  public int hashCode()
+  {
+    return super.hashCode();
+  }
+
+  /**
+     Gets the DER ASN.1 encoded format for this Certificate.
+     It assumes each certificate has only one encoding format.
+     Ex: X.509 is encoded as ASN.1 DER
+
+     @return byte array containg encoded form
+
+     @throws CertificateEncodingException if an error occurs
+  */
+  public abstract byte[] getEncoded() throws CertificateEncodingException;
+
+  /**
+     Verifies that this Certificate was properly signed with the
+     PublicKey that corresponds to its private key. 
+
+     @param key PublicKey to verify with
+
+     @throws CertificateException encoding error
+     @throws NoSuchAlgorithmException unsupported algorithm
+     @throws InvalidKeyException incorrect key
+     @throws NoSuchProviderException no provider
+     @throws SignatureException signature error
+  */
+  public abstract void verify(PublicKey key)
+    throws CertificateException,
+    NoSuchAlgorithmException,
+    InvalidKeyException,
+    NoSuchProviderException,
+    SignatureException;
+
+  /**
+     Verifies that this Certificate was properly signed with the
+     PublicKey that corresponds to its private key and uses
+     the signature engine provided by the provider. 
+
+     @param key PublicKey to verify with
+     @param sigProvider Provider to use for signature algorithm
+
+     @throws CertificateException encoding error
+     @throws NoSuchAlgorithmException unsupported algorithm
+     @throws InvalidKeyException incorrect key
+     @throws NoSuchProviderException incorrect provider
+     @throws SignatureException signature error
+  */
+  public abstract void verify(PublicKey key,
+			      String sigProvider)
+    throws CertificateException,
+    NoSuchAlgorithmException,
+    InvalidKeyException,
+    NoSuchProviderException,
+    SignatureException;
+
+  /**
+     Returns a string representing the Certificate.
+
+     @return a string representing the Certificate.
+  */
+  public abstract String toString();
+
+
+  /**
+     Returns the public key stored in the Certificate.
+
+     @return The public key
+  */
+  public abstract PublicKey getPublicKey();
+
+
+  /* INNER CLASS */
+  /**
+     Certificate.CertificateRep is an inner class used to provide an alternate
+     storage mechanism for serialized Certificates.
+  */
+  protected static class CertificateRep implements java.io.Serializable
+  {
+    private String type;
+    private byte[] data;
+
+    /**
+       Create an alternate Certificate class to store a serialized Certificate
+
+       @param type the name of certificate type
+       @param data the certificate data
+    */
+    protected CertificateRep(String type,
+			     byte[] data)
+    {
+      this.type = type;
+      this.data = data;
+    }
+
+    /**
+       Return the stored Certificate
+
+       @return the stored certificate
+
+       @throws ObjectStreamException if certificate cannot be resolved
+    */
+    protected Object readResolve()
+      throws ObjectStreamException
+    {
+      try {
+	return new ObjectInputStream( new ByteArrayInputStream( data ) ).readObject();
+      } catch ( Exception e ) {
+	e.printStackTrace();
+	throw new RuntimeException ( e.toString() );
+      }
+    }
+  }
+
+}