/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
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 * 2. Redistributions in binary form must reproduce the above copyright
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 * 3. The end-user documentation included with the redistribution,
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 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 4. The names "<WebSig>" and "Apache Software Foundation" must
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 * 5. Products derived from this software may not be called "Apache",
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 2001, Institute for
 * Data Communications Systems, <http://www.nue.et-inf.uni-siegen.de/>.
 * The development of this software was partly funded by the European
 * Commission in the <WebSig> project in the ISIS Programme.
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 * <http://www.apache.org/>.
 */
package org.apache.xml.security.encryption;


/**
 * <code>CipherData</code> provides encrypted data. It must either contain the
 * encrypted octet sequence as base64 encoded text of the
 * <code>CipherValue</code> element, or provide a reference to an external
 * location containing the encrypted octet sequence via the
 * <code>CipherReference</code> element.
 * <p>
 * The schema definition is as follows:
 * <xmp>
 * <element name='CipherData' type='xenc:CipherDataType'/>
 * <complexType name='CipherDataType'>
 *     <choice>
 *         <element name='CipherValue' type='base64Binary'/>
 *         <element ref='xenc:CipherReference'/>
 *     </choice>
 * </complexType>
 * </xmp>
 *
 * @author Axl Mattheus
 */
public interface CipherData {
    public static final int VALUE_TYPE = 0x00000001;
    public static final int REFERENCE_TYPE = 0x00000002;

    /**
     * Returns the type of encrypted data contained in the
     * <code>CipherData</code>.
     *
     * @return <code>VALUE_TYPE</code> if the encrypted data is contained as
     *   <code>CipherValue</code> or <code>REFERENCE_TYPE</code> if the
     *   encrypted data is contained as <code>CipherReference</code>.
     */
    int getDataType();

    /**
     * Returns the cipher value as a base64 encoded <code>byte</code> array.
     *
     * @return the <code>CipherData</code>'s value.
     */
    CipherValue getCipherValue();

    /**
     * Sets the <code>CipherData</code>'s value.
     *
     * @param value the value of the <code>CipherData</code>.
     */
    void setCipherValue(CipherValue value) throws XMLEncryptionException;

    /**
     * Returns a reference to an external location containing the encrypted
     * octet sequence (<code>byte</code> array).
     *
     * @return the reference to an external location containing the enctrypted
     *   octet sequence.
     */
    CipherReference getCipherReference();

    /**
     * Sets the <code>CipherData</code>'s reference.
     *
     * @param reference an external location containing the enctrypted octet
     *   sequence.
     */
    void setCipherReference(CipherReference reference) throws
        XMLEncryptionException;
}