Java™ Platform
Standard Ed. 6

javax.xml.crypto.dsig
Interface XMLSignature

All Superinterfaces:
XMLStructure

public interface XMLSignature
extends XMLStructure

A representation of the XML Signature element as defined in the W3C Recommendation for XML-Signature Syntax and Processing. This class contains methods for signing and validating XML signatures with behavior as defined by the W3C specification. The XML Schema Definition is defined as:


 <element name="Signature" type="ds:SignatureType"/>
 <complexType name="SignatureType">
    <sequence> 
      <element ref="ds:SignedInfo"/> 
      <element ref="ds:SignatureValue"/> 
      <element ref="ds:KeyInfo" minOccurs="0"/> 
      <element ref="ds:Object" minOccurs="0" maxOccurs="unbounded"/> 
    </sequence>  
    <attribute name="Id" type="ID" use="optional"/>
 </complexType>
 

An XMLSignature instance may be created by invoking one of the newXMLSignature methods of the XMLSignatureFactory class.

If the contents of the underlying document containing the XMLSignature are subsequently modified, the behavior is undefined.

Note that this class is named XMLSignature rather than Signature to avoid naming clashes with the existing java.security.Signature class.

Since:
1.6
See Also:
XMLSignatureFactory.newXMLSignature(SignedInfo, KeyInfo), XMLSignatureFactory.newXMLSignature(SignedInfo, KeyInfo, List, String, String)

Nested Class Summary
static interface XMLSignature.SignatureValue
          A representation of the XML SignatureValue element as defined in the W3C Recommendation for XML-Signature Syntax and Processing.
 
Field Summary
static String XMLNS
          The XML Namespace URI of the W3C Recommendation for XML-Signature Syntax and Processing.
 
Method Summary
 String getId()
          Returns the optional Id of this XMLSignature.
 KeyInfo getKeyInfo()
          Returns the key info of this XMLSignature.
 KeySelectorResult getKeySelectorResult()
          Returns the result of the KeySelector, if specified, after this XMLSignature has been signed or validated.
 List getObjects()
          Returns an unmodifiable list of XMLObjects contained in this XMLSignature.
 XMLSignature.SignatureValue getSignatureValue()
          Returns the signature value of this XMLSignature.
 SignedInfo getSignedInfo()
          Returns the signed info of this XMLSignature.
 void sign(XMLSignContext signContext)
          Signs this XMLSignature.
 boolean validate(XMLValidateContext validateContext)
          Validates the signature according to the core validation processing rules.
 
Methods inherited from interface javax.xml.crypto.XMLStructure
isFeatureSupported
 

Field Detail

XMLNS

static final String XMLNS
The XML Namespace URI of the W3C Recommendation for XML-Signature Syntax and Processing.

See Also:
Constant Field Values
Method Detail

validate

boolean validate(XMLValidateContext validateContext)
                 throws XMLSignatureException
Validates the signature according to the core validation processing rules. This method validates the signature using the existing state, it does not unmarshal and reinitialize the contents of the XMLSignature using the location information specified in the context.

This method only validates the signature the first time it is invoked. On subsequent invocations, it returns a cached result.

Parameters:
validateContext - the validating context
Returns:
true if the signature passed core validation, otherwise false
Throws:
ClassCastException - if the type of validateContext is not compatible with this XMLSignature
NullPointerException - if validateContext is null
XMLSignatureException - if an unexpected error occurs during validation that prevented the validation operation from completing

getKeyInfo

KeyInfo getKeyInfo()
Returns the key info of this XMLSignature.

Returns:
the key info (may be null if not specified)

getSignedInfo

SignedInfo getSignedInfo()
Returns the signed info of this XMLSignature.

Returns:
the signed info (never null)

getObjects

List getObjects()
Returns an unmodifiable list of XMLObjects contained in this XMLSignature.

Returns:
an unmodifiable list of XMLObjects (may be empty but never null)

getId

String getId()
Returns the optional Id of this XMLSignature.

Returns:
the Id (may be null if not specified)

getSignatureValue

XMLSignature.SignatureValue getSignatureValue()
Returns the signature value of this XMLSignature.

Returns:
the signature value

sign

void sign(XMLSignContext signContext)
          throws MarshalException,
                 XMLSignatureException
Signs this XMLSignature.

If this method throws an exception, this XMLSignature and the signContext parameter will be left in the state that it was in prior to the invocation.

Parameters:
signContext - the signing context
Throws:
ClassCastException - if the type of signContext is not compatible with this XMLSignature
NullPointerException - if signContext is null
MarshalException - if an exception occurs while marshalling
XMLSignatureException - if an unexpected exception occurs while generating the signature

getKeySelectorResult

KeySelectorResult getKeySelectorResult()
Returns the result of the KeySelector, if specified, after this XMLSignature has been signed or validated.

Returns:
the key selector result, or null if a key selector has not been specified or this XMLSignature has not been signed or validated

Java™ Platform
Standard Ed. 6

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