Package org.docx4j.org.apache.xml.security.transforms.implementations

Class TransformBase64Decode

java.lang.Object

org.docx4j.org.apache.xml.security.transforms.TransformSpi

org.docx4j.org.apache.xml.security.transforms.implementations.TransformBase64Decode

public class TransformBase64Decode
extends TransformSpi

Implements the http://www.w3.org/2000/09/xmldsig#base64 decoding transform.

The normative specification for base64 decoding transforms is [MIME]. The base64 Transform element has no content. The input is decoded by the algorithms. This transform is useful if an application needs to sign the raw data associated with the encoded content of an element.

This transform requires an octet stream for input. If an XPath node-set (or sufficiently functional alternative) is given as input, then it is converted to an octet stream by performing operations logically equivalent to 1) applying an XPath transform with expression self::text(), then 2) taking the string-value of the node-set. Thus, if an XML element is identified by a barename XPointer in the Reference URI, and its content consists solely of base64 encoded character data, then this transform automatically strips away the start and end tags of the identified element and any of its descendant elements as well as any descendant comments and processing instructions. The output of this transform is an octet stream.

Author:

Christian Geuer-Pollmann

See Also:

Base64

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String	implementedTransformURI	Field implementedTransformURI

Fields inherited from class org.docx4j.org.apache.xml.security.transforms.TransformSpi

secureValidation

Constructor Summary

Constructors

Constructor	Description
TransformBase64Decode()

Method Summary

Modifier and Type	Method	Description
protected java.lang.String	engineGetURI()	Method engineGetURI
protected XMLSignatureInput	enginePerformTransform(XMLSignatureInput input, java.io.OutputStream os, Transform transformObject)	The mega method which MUST be implemented by the Transformation Algorithm.
protected XMLSignatureInput	enginePerformTransform(XMLSignatureInput input, Transform transformObject)	Method enginePerformTransform

Methods inherited from class org.docx4j.org.apache.xml.security.transforms.TransformSpi

enginePerformTransform

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

implementedTransformURI

public static final java.lang.String implementedTransformURI

Field implementedTransformURI

See Also:

Constant Field Values

Constructor Details

TransformBase64Decode

public TransformBase64Decode()

Method Details

engineGetURI

protected java.lang.String engineGetURI()

Method engineGetURI

Specified by:

engineGetURI in class TransformSpi

Returns:

the URI representation of Transformation algorithm

enginePerformTransform

protected XMLSignatureInput enginePerformTransform(XMLSignatureInput input, Transform transformObject) throws java.io.IOException, CanonicalizationException, TransformationException

Method enginePerformTransform

Overrides:

enginePerformTransform in class TransformSpi

Parameters:

input -

transformObject - the Transform object

Returns:

XMLSignatureInput as the result of transformation

Throws:

java.io.IOException

CanonicalizationException

TransformationException

enginePerformTransform

protected XMLSignatureInput enginePerformTransform(XMLSignatureInput input, java.io.OutputStream os, Transform transformObject) throws java.io.IOException, CanonicalizationException, TransformationException

Description copied from class: TransformSpi

The mega method which MUST be implemented by the Transformation Algorithm.

Overrides:

enginePerformTransform in class TransformSpi

Parameters:

input - XMLSignatureInput as the input of transformation

os - where to output this transformation.

transformObject - the Transform object

Returns:

XMLSignatureInput as the result of transformation

Throws:

java.io.IOException

CanonicalizationException

TransformationException