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/*
 * $Id: PGPData.java,v 1.4 2005/05/10 16:35:35 mullan Exp $
 */
package javax.xml.crypto.dsig.keyinfo;

import java.util.Collections;
import java.util.List;
import javax.xml.crypto.XMLStructure;


A representation of the XML PGPData element as defined in
the 
W3C Recommendation for XML-Signature Syntax and Processing. A
PGPData object is used to convey information related to
PGP public key pairs and signatures on such keys. The XML Schema Definition
is defined as:

   <element name="PGPData" type="ds:PGPDataType"/>
   <complexType name="PGPDataType">
     <choice>
       <sequence>
         <element name="PGPKeyID" type="base64Binary"/>
         <element name="PGPKeyPacket" type="base64Binary" minOccurs="0"/>
         <any namespace="##other" processContents="lax" minOccurs="0"
          maxOccurs="unbounded"/>
       </sequence>
       <sequence>
         <element name="PGPKeyPacket" type="base64Binary"/>
         <any namespace="##other" processContents="lax" minOccurs="0"
          maxOccurs="unbounded"/>
       </sequence>
     </choice>
   </complexType>


A PGPData instance may be created by invoking one of the newPGPData methods of the KeyInfoFactory class, and passing it byte arrays representing the contents of the PGP public key
identifier and/or PGP key material packet, and an optional list of
elements from an external namespace.

Author:Sean Mullan, JSR 105 Expert Group
See Also:
Since:1.6
/**
 * A representation of the XML <code>PGPData</code> element as defined in
 * the <a href="http://www.w3.org/TR/xmldsig-core/">
 * W3C Recommendation for XML-Signature Syntax and Processing</a>. A
 * <code>PGPData</code> object is used to convey information related to
 * PGP public key pairs and signatures on such keys. The XML Schema Definition
 * is defined as:
 *
 * <pre>
 *    &lt;element name="PGPData" type="ds:PGPDataType"/&gt;
 *    &lt;complexType name="PGPDataType"&gt;
 *      &lt;choice&gt;
 *        &lt;sequence&gt;
 *          &lt;element name="PGPKeyID" type="base64Binary"/&gt;
 *          &lt;element name="PGPKeyPacket" type="base64Binary" minOccurs="0"/&gt;
 *          &lt;any namespace="##other" processContents="lax" minOccurs="0"
 *           maxOccurs="unbounded"/&gt;
 *        &lt;/sequence&gt;
 *        &lt;sequence&gt;
 *          &lt;element name="PGPKeyPacket" type="base64Binary"/&gt;
 *          &lt;any namespace="##other" processContents="lax" minOccurs="0"
 *           maxOccurs="unbounded"/&gt;
 *        &lt;/sequence&gt;
 *      &lt;/choice&gt;
 *    &lt;/complexType&gt;
 * </pre>
 *
 * A <code>PGPData</code> instance may be created by invoking one of the
 * {@link KeyInfoFactory#newPGPData newPGPData} methods of the {@link
 * KeyInfoFactory} class, and passing it
 * <code>byte</code> arrays representing the contents of the PGP public key
 * identifier and/or PGP key material packet, and an optional list of
 * elements from an external namespace.
 *
 * @author Sean Mullan
 * @author JSR 105 Expert Group
 * @since 1.6
 * @see KeyInfoFactory#newPGPData(byte[])
 * @see KeyInfoFactory#newPGPData(byte[], byte[], List)
 * @see KeyInfoFactory#newPGPData(byte[], List)
 */
public interface PGPData extends XMLStructure {

    
URI identifying the PGPData KeyInfo type:
http://www.w3.org/2000/09/xmldsig#PGPData. This can be specified as the
value of the type parameter of the RetrievalMethod class to describe a remote PGPData structure.

/**
     * URI identifying the PGPData KeyInfo type:
     * http://www.w3.org/2000/09/xmldsig#PGPData. This can be specified as the
     * value of the <code>type</code> parameter of the {@link RetrievalMethod}
     * class to describe a remote <code>PGPData</code> structure.
     */
    final static String TYPE = "http://www.w3.org/2000/09/xmldsig#PGPData";

    
Returns the PGP public key identifier of this PGPData as
defined in RFC 2440,
section 11.2.

Returns:the PGP public key identifier (may be null if
   not specified). Each invocation of this method returns a new clone
   to protect against subsequent modification.
/**
     * Returns the PGP public key identifier of this <code>PGPData</code> as
     * defined in <a href="http://www.ietf.org/rfc/rfc2440.txt">RFC 2440</a>,
     * section 11.2.
     *
     * @return the PGP public key identifier (may be <code>null</code> if
     *    not specified). Each invocation of this method returns a new clone
     *    to protect against subsequent modification.
     */
    byte[] getKeyId();

    
Returns the PGP key material packet of this PGPData as
defined in RFC 2440,
section 5.5.

Returns:the PGP key material packet (may be null if not
   specified). Each invocation of this method returns a new clone to
   protect against subsequent modification.
/**
     * Returns the PGP key material packet of this <code>PGPData</code> as
     * defined in <a href="http://www.ietf.org/rfc/rfc2440.txt">RFC 2440</a>,
     * section 5.5.
     *
     * @return the PGP key material packet (may be <code>null</code> if not
     *    specified). Each invocation of this method returns a new clone to
     *    protect against subsequent modification.
     */
    byte[] getKeyPacket();

    
Returns an unmodifiable list of XMLStructures representing elements from an external namespace. 
Returns:an unmodifiable list of XMLStructures (may be
   empty, but never null)
/**
     * Returns an {@link Collections#unmodifiableList unmodifiable list}
     * of {@link XMLStructure}s representing elements from an external
     * namespace.
     *
     * @return an unmodifiable list of <code>XMLStructure</code>s (may be
     *    empty, but never <code>null</code>)
     */
    List<XMLStructure> getExternalElements();
}