Java™ Platform
Standard Ed. 6

javax.xml.crypto.dsig.keyinfo
Interface KeyValue

All Superinterfaces:
XMLStructure

public interface KeyValue
extends XMLStructure

A representation of the XML KeyValue element as defined in the W3C Recommendation for XML-Signature Syntax and Processing. A KeyValue object contains a single public key that may be useful in validating the signature. The XML schema definition is defined as:

    <element name="KeyValue" type="ds:KeyValueType"/>
    <complexType name="KeyValueType" mixed="true">
      <choice>
        <element ref="ds:DSAKeyValue"/>
        <element ref="ds:RSAKeyValue"/>
        <any namespace="##other" processContents="lax"/>
      </choice>
    </complexType>

    <element name="DSAKeyValue" type="ds:DSAKeyValueType"/>
    <complexType name="DSAKeyValueType">
      <sequence>
        <sequence minOccurs="0">
          <element name="P" type="ds:CryptoBinary"/>
          <element name="Q" type="ds:CryptoBinary"/>
        </sequence>
        <element name="G" type="ds:CryptoBinary" minOccurs="0"/> 
        <element name="Y" type="ds:CryptoBinary"/> 
        <element name="J" type="ds:CryptoBinary" minOccurs="0"/>
        <sequence minOccurs="0">
          <element name="Seed" type="ds:CryptoBinary"/> 
          <element name="PgenCounter" type="ds:CryptoBinary"/> 
        </sequence>
      </sequence>
    </complexType>

    <element name="RSAKeyValue" type="ds:RSAKeyValueType"/>
    <complexType name="RSAKeyValueType">
      <sequence>
        <element name="Modulus" type="ds:CryptoBinary"/> 
        <element name="Exponent" type="ds:CryptoBinary"/>
      </sequence>
    </complexType>
 
A KeyValue instance may be created by invoking the newKeyValue method of the KeyInfoFactory class, and passing it a PublicKey representing the value of the public key. Here is an example of creating a KeyValue from a DSAPublicKey of a Certificate stored in a KeyStore:
 KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
 PublicKey dsaPublicKey = keyStore.getCertificate("myDSASigningCert").getPublicKey();
 KeyInfoFactory factory = KeyInfoFactory.getInstance("DOM");
 KeyValue keyValue = factory.newKeyValue(dsaPublicKey);
 
This class returns the DSAKeyValue and RSAKeyValue elements as objects of type DSAPublicKey and RSAPublicKey, respectively. Note that not all of the fields in the schema are accessible as parameters of these types.

Since:
1.6
See Also:
KeyInfoFactory.newKeyValue(PublicKey)

Field Summary
static String DSA_TYPE
          URI identifying the DSA KeyValue KeyInfo type: http://www.w3.org/2000/09/xmldsig#DSAKeyValue.
static String RSA_TYPE
          URI identifying the RSA KeyValue KeyInfo type: http://www.w3.org/2000/09/xmldsig#RSAKeyValue.
 
Method Summary
 PublicKey getPublicKey()
          Returns the public key of this KeyValue.
 
Methods inherited from interface javax.xml.crypto.XMLStructure
isFeatureSupported
 

Field Detail

DSA_TYPE

static final String DSA_TYPE
URI identifying the DSA KeyValue KeyInfo type: http://www.w3.org/2000/09/xmldsig#DSAKeyValue. This can be specified as the value of the type parameter of the RetrievalMethod class to describe a remote DSAKeyValue structure.

See Also:
Constant Field Values

RSA_TYPE

static final String RSA_TYPE
URI identifying the RSA KeyValue KeyInfo type: http://www.w3.org/2000/09/xmldsig#RSAKeyValue. This can be specified as the value of the type parameter of the RetrievalMethod class to describe a remote RSAKeyValue structure.

See Also:
Constant Field Values
Method Detail

getPublicKey

PublicKey getPublicKey()
                       throws KeyException
Returns the public key of this KeyValue.

Returns:
the public key of this KeyValue
Throws:
KeyException - if this KeyValue cannot be converted to a PublicKey

Java™ Platform
Standard Ed. 6

Submit a bug or feature
For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2008 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.


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