javax.xml.crypto Package in Java

Last Updated : 25 Mar, 2022

Common classes having the XML cryptography for the Package javax.xml.crypto. now this crypto package includes similar classes that are used to accessing XML cryptographic on its operations, such as creating an XML signature or encrypted XML data.

There are two types of javax.xml.crypto classes in this package that are KeySelector class, which allows developers to supply implementing that will locate and optionally validate keys using the information obtained in KeyInfo objects, and in URIDereferencer classes, which are giving permission to developers to generate and create uniquely their own self URI dereferencing implementations to under this useful Package javax.xml.crypto

This Package javax.xml.crypto creating base at the uniquely like XML mechanisms types that will be validating the XML generating its process that an ongoing mechanism process using internal methods to parsing and invoking the XML signatures and KeyInfo into structures as well, as on the JSR supports one implemented similar type like DOM. These XML Digital Signatures are obtaining implementation goals like sets of packages with Java SE supporting the DOM mechanisms through new module types similar as this example will be added in the future as JDOM

Module java.xml.crypto: Explaining the API of XML cryptographies

The Module Graph:

java.xml.crypto
    --> java.xml
        --> java.base
            GeeksforGeeks

java.xml.crypto
java.xml
java.base

Uses of Package javax.xml.crypto Within this package javax.xml.crypto

javax.xml.crypto: Package that use in javax.xml.crypto
javax.xml.crypto: Common classes having XML cryptography
javax.xml.crypto.dom: DOM-specified classes having the javax.xml.crypto package
javax.xml.crypto.dsig: Classes for creating and verifying XML digital signatures
javax.xml.crypto.dsig.dom: DOM-specified classes for the similar its javax.xml.crypto.dsig packages
javax.xml.crypto.dsig.keyinfo: this Classes are for parsing and accessing the KeyInfo elements and structures
javax.xml.crypto.dsig.spec: This Parameterised javax.xml.crypto.dsig.spec classes are commonly uses XML digital signatures
javax.xml.crypto: It have Common similar classes for using XML cryptography

Interface Summary

AlgorithmMethod: An abstraction of representing an algorithm declaring in the XML Security specifications on it
Data: Having an abstraction representation of resulting in an implementing a URIReference or the input/output of its subsequent Transformations
KeySelectorResult: The resultant has returned by the method KeySelector.select
NodeSetData: This node has an abstracted representation of Data types that have occurred a node-set
URIDereferencer: It is implementing of URIReferences on it
URIReference: It validates a data object via a path URI-Reference, as specified by the RFC-2396
XMLCryptoContext: Accessing a set of common context data for XML cryptographic methods of operations performing on it
XMLStructure: An abstract representation of an XML structure query from any namespaces

Class Summary

KeySelector: The Key selector is having work as finding an accessing key and returning a key in it by using the information obtained in its KeyInfo objects
KeySelector.Purpose: The objective of this KeySelector.Purpose key is that has goal to be selected within a selection
OctetStreamData: A streaming of a Data types holding an octet-stream Data

Exception Summary

KeySelectorException: This KeySelectorException is an exceptional condition that is thrown by a simple class KeySelector
MarshalException: An exceptional condition that indicates towards during the phase of XML marshaling or unmarshalling process running
NoSuchMechanismException: This NoSuchMechanismException exception is thrown by a particular XML mechanism is happening by accessing a requested but is not available in its running environment
URIReferenceException: this URIReferenceException shows an exceptional condition thrown exception meanwhile there is a dereferencing in the URIReference
XMLCryptoContext: Contains common context content data stored for XML cryptographic operations running it
XMLStructure: A classification of an XML structure for Exception as from any namespace

Example:

Java

// Java Program to show Showing Syntax and use of Package
// javax.xml.crypto Via Classes, Interfaces And Exceptions

// Having URIReference and XMLCryptoContext
public MyServer(final URIReference abc,
                XMLCryptoContext cde)
    throws URIReferenceException
{

    String str = abc.getURI();

    if (str.equals(STYLESHEET)
        || str.equals(STYLESHEET_B64)) {

        // Try block to check for exceptions
        try {

            // reading from file
            FileInputStream fcs
                = new FileInputStream(new File(
                    DATA_DIR,
                    str.substring(str.lastIndexOf('/'))));

            return new OctetStreamData(fcs, abc.getURI(),
                                       ref.getType());

            // Display message only
            System.out.println("Hello GFG Readers!");
        }

        // Catch block to handle exceptions
        catch (Exception e) {
            throw new URIReferenceException(e);
        }
    }

    // Fallback on it
    return defaultUd.dereference(abc, cde);
}