/* Certificate.java -- deprecated interface for modeling digital certificates
   Copyright (C) 1998, 2002, 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
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General Public License for more details.

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02111-1307 USA.

Linking this library statically or dynamically with other modules is
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permission to link this library with independent modules to produce an
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package java.security;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * 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.
 *
 * @author Aaron M. Renn (arenn@urbanophile.com)
 * @since 1.1
 * @deprecated use {@link java.security.cert} instead
 * @status updated to 1.4
 */
public interface Certificate
{
  /**
   * This method returns the <code>Principal</code> that is guaranteeing
   * this certificate.
   *
   * @return the <code>Principal</code> guaranteeing the certificate
   */
  Principal getGuarantor();

  /**
   * This method returns the <code>Principal</code> being guaranteed by
   * this certificate.
   *
   * @return the <code>Principal</code> guaranteed by this certificate
   */
  Principal getPrincipal();

  /**
   * This method returns the public key for the <code>Principal</code> that
   * is being guaranteed.
   *
   * @return the <code>PublicKey</code> of the Principal being guaranteed
   */
  PublicKey getPublicKey();

  /**
   * 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
   * @throws KeyException if there is a problem with the certificate
   * @throws IOException if an error occurs writing to the stream
   * @see #decode(InputStream)
   * @see #getFormat()
   */
  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
   * @throws KeyException if there is a problem with the certificate data
   * @throws IOException if an error occurs reading from the stream
   * @see #encode(OutputStream)
   * @see #getFormat()
   */
  void decode(InputStream in) throws KeyException, IOException;

  /**
   * 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
   */
  String getFormat();

  /**
   * This method returns a <code>String</code> representation of the contents
   * of this certificate.
   *
   * @param detail true to provided more detailed information
   * @return the string representation
   */
  String toString(boolean detail);
} // interface Certificate