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/* X509Extension.java --- X.509 Extension

   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., 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.cert;

import java.util.Set;

/**

        Public interface for the X.509 Extension.

        This is used for X.509 v3 Certificates and CRL v2 (Certificate

        Revocation Lists) for managing attributes assoicated with

        Certificates, for managing the hierarchy of certificates,

        and for managing the distribution of CRL. This extension

        format is used to define private extensions.

        Each extensions for a certificate or CRL must be marked

        either critical or non-critical. If the certificate/CRL

        system encounters a critical extension not recognized then

        it must reject the certificate. A non-critical extension

        may be just ignored if not recognized.

        The ASN.1 definition for this class is:

         Extensions  ::=  SEQUENCE SIZE (1..MAX) OF Extension

         Extension  ::=  SEQUENCE  {

             extnId        OBJECT IDENTIFIER,

             critical      BOOLEAN DEFAULT FALSE,

             extnValue     OCTET STRING

                           -- contains a DER encoding of a value

                           -- of the type registered for use with

                           -- the extnId object identifier value

         }

        @author Mark Benvenuto

        @since 1.2

*/

public interface X509Extension

{

  /**

     Returns true if the certificate contains a critical extension

     that is not supported.

     @return true if has unsupported extension, false otherwise

  */

  boolean hasUnsupportedCriticalExtension();

  /**

     Returns a set of the CRITICAL extension OIDs from the

     certificate/CRL that the object implementing this interface

     manages.

     @return A Set containing the OIDs. If there are no CRITICAL

     extensions or extensions at all this returns null.

  */

  Set<String> getCriticalExtensionOIDs();

  /**

     Returns a set of the NON-CRITICAL extension OIDs from the

     certificate/CRL that the object implementing this interface

     manages.

     @return A Set containing the OIDs. If there are no NON-CRITICAL

     extensions or extensions at all this returns null.

  */

  Set<String> getNonCriticalExtensionOIDs();

  /**

     Returns the DER encoded OCTET string for the specified

     extension value identified by a OID. The OID is a string

     of number separated by periods. Ex: 12.23.45.67

  */

  byte[] getExtensionValue(String oid);

}