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diff --git a/libjava/java/security/Certificate.java b/libjava/java/security/Certificate.java
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+/* Certificate.java -- Interface for modeling digital certificates
+   Copyright (C) 1998 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;
+
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.IOException;
+
+/**
+ * This interface models a digital certificate which verifies the 
+ * authenticity of a party.  This class simply allows certificate
+ * information to be queried, it does not guarantee that the certificate
+ * is valid.
+ * <p>
+ * This class is deprecated in favor of the new java.security.cert package.
+ * It exists for backward compatibility only.
+ * 
+ * @deprecated
+ *
+ * @version 0.0
+ *
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ */
+public interface Certificate
+{
+
+  /**
+   * This method returns the <code>Principal</code> that is guaranteeing
+   * this certificate.
+   *
+   * @return The <code>Principal</code> guaranteeing the certificate
+   */
+  public abstract Principal getGuarantor();
+
+  /**
+   * This method returns the <code>Principal</code> being guaranteed by
+   * this certificate.
+   *
+   * @return The <code>Principal</code> guaranteed by this certificate.
+   */
+  public abstract Principal getPrincipal();
+
+  /**
+   * This method returns the public key for the <code>Principal</code> that
+   * is being guaranteed.
+   *
+   * @return The <code>PublicKey</code> of the <code>Principal</code> being guaranteed
+   */
+  public abstract PublicKey getPublicKey();
+
+  /**
+   * This method returns the encoding format of the certificate (e.g., "PGP",
+   * "X.509").  This format is used by the <code>encode</code. and
+   * <code>decode</code> methods.
+   *
+   * @return The encoding format being used
+   */
+  public abstract String getFormat();
+
+  /**
+   * This method writes the certificate to an <code>OutputStream</code> in
+   * a format that can be understood by the <code>decode</code> method.
+   *
+   * @param out The <code>OutputStream</code> to write to.
+   *
+   * @exception KeyException If there is a problem with the internals of this certificate
+   * @exception IOException If an error occurs writing to the stream.
+   */
+  public abstract void
+    encode(OutputStream out) throws KeyException, IOException;
+
+  /**
+   * This method reads an encoded certificate from an <code>InputStream</code>.
+   *
+   * @param in The <code>InputStream</code> to read from.
+   *
+   * @param KeyException If there is a problem with the certificate data
+   * @param IOException If an error occurs reading from the stream.
+   */
+  public abstract void
+    decode(InputStream in) throws KeyException, IOException;
+
+  /**
+   * This method returns a <code>String</code> representation of the contents
+   * of this certificate.
+   *
+   * @param detail <code>true</code> to provided detailed information about this certificate, <code>false</code> otherwise
+   */
+  public abstract String toString(boolean detail);
+}