| /* |
| * Copyright 2003-2004 The Apache Software Foundation. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| package org.apache.xml.security.encryption; |
| |
| import org.w3c.dom.Attr; |
| |
| |
| /** |
| * <code>CipherReference</code> identifies a source which, when processed, |
| * yields the encrypted octet sequence. |
| * <p> |
| * The actual value is obtained as follows. The <code>CipherReference URI</code> |
| * contains an identifier that is dereferenced. Should the |
| * <code>CipherReference</code> element contain an OPTIONAL sequence of |
| * Transforms, the data resulting from dereferencing the <code>URI</code> is |
| * transformed as specified so as to yield the intended cipher value. For |
| * example, if the value is base64 encoded within an XML document; the |
| * transforms could specify an XPath expression followed by a base64 decoding so |
| * as to extract the octets. |
| * <p> |
| * The syntax of the <code>URI</code> and Transforms is similar to that of |
| * [XML-DSIG]. However, there is a difference between signature and encryption |
| * processing. In [XML-DSIG] both generation and validation processing start |
| * with the same source data and perform that transform in the same order. In |
| * encryption, the decryptor has only the cipher data and the specified |
| * transforms are enumerated for the decryptor, in the order necessary to obtain |
| * the octets. Consequently, because it has different semantics Transforms is in |
| * the &xenc; namespace. |
| * <p> |
| * The schema definition is as follows: |
| * <xmp> |
| * <element name='CipherReference' type='xenc:CipherReferenceType'/> |
| * <complexType name='CipherReferenceType'> |
| * <sequence> |
| * <element name='Transforms' type='xenc:TransformsType' minOccurs='0'/> |
| * </sequence> |
| * <attribute name='URI' type='anyURI' use='required'/> |
| * </complexType> |
| * </xmp> |
| * |
| * @author Axl Mattheus |
| */ |
| public interface CipherReference { |
| /** |
| * Returns an <code>URI</code> that contains an identifier that should be |
| * dereferenced. |
| * @return |
| */ |
| String getURI(); |
| |
| /** |
| * Gets the URI as an Attribute node. Used to meld the CipherREference |
| * with the XMLSignature ResourceResolvers |
| * @return |
| */ |
| public Attr getURIAsAttr(); |
| |
| /** |
| * Returns the <code>Transforms</code> that specifies how to transform the |
| * <code>URI</code> to yield the appropiate cipher value. |
| * |
| * @return the transform that specifies how to transform the reference to |
| * yield the intended cipher value. |
| */ |
| Transforms getTransforms(); |
| |
| /** |
| * Sets the <code>Transforms</code> that specifies how to transform the |
| * <code>URI</code> to yield the appropiate cipher value. |
| * |
| * @param transforms the set of <code>Transforms</code> that specifies how |
| * to transform the reference to yield the intended cipher value. |
| */ |
| void setTransforms(Transforms transforms); |
| } |
| |