javax.xml.crypto.dsig

Class XMLSignatureFactory


  • public abstract class XMLSignatureFactory
extends Object
    A factory for creating XMLSignature objects from scratch or for unmarshalling an XMLSignature object from a corresponding XML representation.

    XMLSignatureFactory Type

    Each instance of XMLSignatureFactory supports a specific XML mechanism type. To create an XMLSignatureFactory, call one of the static getInstance methods, passing in the XML mechanism type desired, for example:

    XMLSignatureFactory factory = XMLSignatureFactory.getInstance("DOM");

    The objects that this factory produces will be based on DOM and abide by the DOM interoperability requirements as defined in the DOM Mechanism Requirements section of the API overview. See the Service Providers section of the API overview for a list of standard mechanism types.

    XMLSignatureFactory implementations are registered and loaded using the Provider mechanism. For example, a service provider that supports the DOM mechanism would be specified in the Provider subclass as: 

         put("XMLSignatureFactory.DOM", "org.example.DOMXMLSignatureFactory");

    An implementation MUST minimally support the default mechanism type: DOM.

    Note that a caller must use the same XMLSignatureFactory instance to create the XMLStructures of a particular XMLSignature that is to be generated. The behavior is undefined if XMLStructures from different providers or different mechanism types are used together.

    Also, the XMLStructures that are created by this factory may contain state specific to the XMLSignature and are not intended to be reusable.

    Creating XMLSignatures from scratch

    Once the XMLSignatureFactory has been created, objects can be instantiated by calling the appropriate method. For example, a Reference instance may be created by invoking one of the newReference methods.

    Unmarshalling XMLSignatures from XML

    Alternatively, an XMLSignature may be created from an existing XML representation by invoking the unmarshalXMLSignature method and passing it a mechanism-specific XMLValidateContext instance containing the XML content: 

     DOMValidateContext context = new DOMValidateContext(key, signatureElement);
 XMLSignature signature = factory.unmarshalXMLSignature(context);
    Each XMLSignatureFactory must support the required XMLValidateContext types for that factory type, but may support others. A DOM XMLSignatureFactory must support DOMValidateContext objects.

    Signing and marshalling XMLSignatures to XML

    Each XMLSignature created by the factory can also be marshalled to an XML representation and signed, by invoking the sign method of the XMLSignature object and passing it a mechanism-specific XMLSignContext object containing the signing key and marshalling parameters (see DOMSignContext). For example: 
        DOMSignContext context = new DOMSignContext(privateKey, document);
    signature.sign(context);
    Concurrent Access

    The static methods of this class are guaranteed to be thread-safe. Multiple threads may concurrently invoke the static methods defined in this class with no ill effects.

    However, this is not true for the non-static methods defined by this class. Unless otherwise documented by a specific provider, threads that need to access a single XMLSignatureFactory instance concurrently should synchronize amongst themselves and provide the necessary locking. Multiple threads each manipulating a different XMLSignatureFactory instance need not synchronize.

    Since:
    1.6

    • Constructor Detail

      • XMLSignatureFactory

        protected XMLSignatureFactory()
        Default constructor, for invocation by subclasses.

    • Method Detail

      • getInstance

        public static XMLSignatureFactory getInstance(String mechanismType)
        Returns an XMLSignatureFactory that supports the specified XML processing mechanism and representation type (ex: "DOM").

        This method uses the standard JCA provider lookup mechanism to locate and instantiate an XMLSignatureFactory implementation of the desired mechanism type. It traverses the list of registered security Providers, starting with the most preferred Provider. A new XMLSignatureFactory object from the first Provider that supports the specified mechanism is returned.

        Note that the list of registered providers may be retrieved via the Security.getProviders() method.

        Parameters:
        mechanismType - the type of the XML processing mechanism and representation. See the Service Providers section of the API overview for a list of standard mechanism types.
        Returns:
        a new XMLSignatureFactory
        Throws:
        NullPointerException - if mechanismType is null
        NoSuchMechanismException - if no Provider supports an XMLSignatureFactory implementation for the specified mechanism
        See Also:
        Provider

      • getInstance

        public static XMLSignatureFactory getInstance(String mechanismType,
                                              Provider provider)
        Returns an XMLSignatureFactory that supports the requested XML processing mechanism and representation type (ex: "DOM"), as supplied by the specified provider. Note that the specified Provider object does not have to be registered in the provider list.
        Parameters:
        mechanismType - the type of the XML processing mechanism and representation. See the Service Providers section of the API overview for a list of standard mechanism types.
        provider - the Provider object
        Returns:
        a new XMLSignatureFactory
        Throws:
        NullPointerException - if provider or mechanismType is null
        NoSuchMechanismException - if an XMLSignatureFactory implementation for the specified mechanism is not available from the specified Provider object
        See Also:
        Provider

      • getInstance

        public static XMLSignatureFactory getInstance(String mechanismType,
                                              String provider)
                                       throws NoSuchProviderException
        Returns an XMLSignatureFactory that supports the requested XML processing mechanism and representation type (ex: "DOM"), as supplied by the specified provider. The specified provider must be registered in the security provider list.

        Note that the list of registered providers may be retrieved via the Security.getProviders() method.

        Parameters:
        mechanismType - the type of the XML processing mechanism and representation. See the Service Providers section of the API overview for a list of standard mechanism types.
        provider - the string name of the provider
        Returns:
        a new XMLSignatureFactory
        Throws:
        NoSuchProviderException - if the specified provider is not registered in the security provider list
        NullPointerException - if provider or mechanismType is null
        NoSuchMechanismException - if an XMLSignatureFactory implementation for the specified mechanism is not available from the specified provider
        See Also:
        Provider

      • getInstance

        public static XMLSignatureFactory getInstance()
        Returns an XMLSignatureFactory that supports the default XML processing mechanism and representation type ("DOM").

        This method uses the standard JCA provider lookup mechanism to locate and instantiate an XMLSignatureFactory implementation of the default mechanism type. It traverses the list of registered security Providers, starting with the most preferred Provider. A new XMLSignatureFactory object from the first Provider that supports the DOM mechanism is returned.

        Note that the list of registered providers may be retrieved via the Security.getProviders() method.

        Returns:
        a new XMLSignatureFactory
        Throws:
        NoSuchMechanismException - if no Provider supports an XMLSignatureFactory implementation for the DOM mechanism
        See Also:
        Provider

      • getMechanismType

        public final String getMechanismType()
        Returns the type of the XML processing mechanism and representation supported by this XMLSignatureFactory (ex: "DOM").
        Returns:
        the XML processing mechanism type supported by this XMLSignatureFactory

      • getProvider

        public final Provider getProvider()
        Returns the provider of this XMLSignatureFactory.
        Returns:
        the provider of this XMLSignatureFactory

      • newXMLSignature

        public abstract XMLSignature newXMLSignature(SignedInfo si,
                                             KeyInfo ki)
        Creates an XMLSignature and initializes it with the contents of the specified SignedInfo and KeyInfo objects.
        Parameters:
        si - the signed info
        ki - the key info (may be null)
        Returns:
        an XMLSignature
        Throws:
        NullPointerException - if si is null

      • newXMLSignature

        public abstract XMLSignature newXMLSignature(SignedInfo si,
                                             KeyInfo ki,
                                             List objects,
                                             String id,
                                             String signatureValueId)
        Creates an XMLSignature and initializes it with the specified parameters.
        Parameters:
        si - the signed info
        ki - the key info (may be null)
        objects - a list of XMLObjects (may be empty or null)
        id - the Id (may be null)
        signatureValueId - the SignatureValue Id (may be null)
        Returns:
        an XMLSignature
        Throws:
        NullPointerException - if si is null
        ClassCastException - if any of the objects are not of type XMLObject

      • newReference

        public abstract Reference newReference(String uri,
                                       DigestMethod dm,
                                       List transforms,
                                       String type,
                                       String id)
        Creates a Reference with the specified parameters.
        Parameters:
        uri - the reference URI (may be null)
        dm - the digest method
        transforms - a list of Transforms. The list is defensively copied to protect against subsequent modification. May be null or empty.
        type - the reference type, as a URI (may be null)
        id - the reference ID (may be null)
        Returns:
        a Reference
        Throws:
        ClassCastException - if any of the transforms are not of type Transform
        IllegalArgumentException - if uri is not RFC 2396 compliant
        NullPointerException - if dm is null

      • newReference

        public abstract Reference newReference(String uri,
                                       DigestMethod dm,
                                       List transforms,
                                       String type,
                                       String id,
                                       byte[] digestValue)
        Creates a Reference with the specified parameters and pre-calculated digest value.

        This method is useful when the digest value of a Reference has been previously computed. See for example, the OASIS-DSS (Digital Signature Services) specification.

        Parameters:
        uri - the reference URI (may be null)
        dm - the digest method
        transforms - a list of Transforms. The list is defensively copied to protect against subsequent modification. May be null or empty.
        type - the reference type, as a URI (may be null)
        id - the reference ID (may be null)
        digestValue - the digest value. The array is cloned to protect against subsequent modification.
        Returns:
        a Reference
        Throws:
        ClassCastException - if any of the transforms are not of type Transform
        IllegalArgumentException - if uri is not RFC 2396 compliant
        NullPointerException - if dm or digestValue is null

      • newReference

        public abstract Reference newReference(String uri,
                                       DigestMethod dm,
                                       List appliedTransforms,
                                       Data result,
                                       List transforms,
                                       String type,
                                       String id)
        Creates a Reference with the specified parameters.

        This method is useful when a list of transforms have already been applied to the Reference. See for example, the OASIS-DSS (Digital Signature Services) specification.

        When an XMLSignature containing this reference is generated, the specified transforms (if non-null) are applied to the specified result. The Transforms element of the resulting Reference element is set to the concatenation of the appliedTransforms and transforms.

        Parameters:
        uri - the reference URI (may be null)
        dm - the digest method
        appliedTransforms - a list of Transforms that have already been applied. The list is defensively copied to protect against subsequent modification. The list must contain at least one entry.
        result - the result of processing the sequence of appliedTransforms
        transforms - a list of Transforms that are to be applied when generating the signature. The list is defensively copied to protect against subsequent modification. May be null or empty.
        type - the reference type, as a URI (may be null)
        id - the reference ID (may be null)
        Returns:
        a Reference
        Throws:
        ClassCastException - if any of the transforms (in either list) are not of type Transform
        IllegalArgumentException - if uri is not RFC 2396 compliant or appliedTransforms is empty
        NullPointerException - if dm, appliedTransforms or result is null

      • newSignedInfo

        public abstract SignedInfo newSignedInfo(CanonicalizationMethod cm,
                                         SignatureMethod sm,
                                         List references)
        Creates a SignedInfo with the specified canonicalization and signature methods, and list of one or more references.
        Parameters:
        cm - the canonicalization method
        sm - the signature method
        references - a list of one or more References. The list is defensively copied to protect against subsequent modification.
        Returns:
        a SignedInfo
        Throws:
        ClassCastException - if any of the references are not of type Reference
        IllegalArgumentException - if references is empty
        NullPointerException - if any of the parameters are null

      • newXMLObject

        public abstract XMLObject newXMLObject(List content,
                                       String id,
                                       String mimeType,
                                       String encoding)
        Creates an XMLObject from the specified parameters.
        Parameters:
        content - a list of XMLStructures. The list is defensively copied to protect against subsequent modification. May be null or empty.
        id - the Id (may be null)
        mimeType - the mime type (may be null)
        encoding - the encoding (may be null)
        Returns:
        an XMLObject
        Throws:
        ClassCastException - if content contains any entries that are not of type XMLStructure

      • newManifest

        public abstract Manifest newManifest(List references)
        Creates a Manifest containing the specified list of References.
        Parameters:
        references - a list of one or more References. The list is defensively copied to protect against subsequent modification.
        Returns:
        a Manifest
        Throws:
        NullPointerException - if references is null
        IllegalArgumentException - if references is empty
        ClassCastException - if references contains any entries that are not of type Reference

      • newManifest

        public abstract Manifest newManifest(List references,
                                     String id)
        Creates a Manifest containing the specified list of References and optional id.
        Parameters:
        references - a list of one or more References. The list is defensively copied to protect against subsequent modification.
        id - the id (may be null)
        Returns:
        a Manifest
        Throws:
        NullPointerException - if references is null
        IllegalArgumentException - if references is empty
        ClassCastException - if references contains any entries that are not of type Reference

      • newSignatureProperty

        public abstract SignatureProperty newSignatureProperty(List content,
                                                       String target,
                                                       String id)
        Creates a SignatureProperty containing the specified list of XMLStructures, target URI and optional id.
        Parameters:
        content - a list of one or more XMLStructures. The list is defensively copied to protect against subsequent modification.
        target - the target URI of the Signature that this property applies to
        id - the id (may be null)
        Returns:
        a SignatureProperty
        Throws:
        NullPointerException - if content or target is null
        IllegalArgumentException - if content is empty
        ClassCastException - if content contains any entries that are not of type XMLStructure

      • newTransform

        public abstract Transform newTransform(String algorithm,
                                       XMLStructure params)
                                throws NoSuchAlgorithmException,
                                       InvalidAlgorithmParameterException
        Creates a Transform for the specified algorithm URI and parameters. The parameters are specified as a mechanism-specific XMLStructure (ex: DOMStructure). This method is useful when the parameters are in XML form or there is no standard class for specifying the parameters.
        Parameters:
        algorithm - the URI identifying the transform algorithm
        params - a mechanism-specific XML structure from which to unmarshal the parameters from (may be null if not required or optional)
        Returns:
        the Transform
        Throws:
        ClassCastException - if the type of params is inappropriate for this XMLSignatureFactory
        InvalidAlgorithmParameterException - if the specified parameters are inappropriate for the requested algorithm
        NoSuchAlgorithmException - if an implementation of the specified algorithm cannot be found
        NullPointerException - if algorithm is null

      • newCanonicalizationMethod

        public abstract CanonicalizationMethod newCanonicalizationMethod(String algorithm,
                                                                 XMLStructure params)
                                                          throws NoSuchAlgorithmException,
                                                                 InvalidAlgorithmParameterException
        Creates a CanonicalizationMethod for the specified algorithm URI and parameters. The parameters are specified as a mechanism-specific XMLStructure (ex: DOMStructure). This method is useful when the parameters are in XML form or there is no standard class for specifying the parameters.
        Parameters:
        algorithm - the URI identifying the canonicalization algorithm
        params - a mechanism-specific XML structure from which to unmarshal the parameters from (may be null if not required or optional)
        Returns:
        the CanonicalizationMethod
        Throws:
        ClassCastException - if the type of params is inappropriate for this XMLSignatureFactory
        InvalidAlgorithmParameterException - if the specified parameters are inappropriate for the requested algorithm
        NoSuchAlgorithmException - if an implementation of the specified algorithm cannot be found
        NullPointerException - if algorithm is null

      • getKeyInfoFactory

        public final KeyInfoFactory getKeyInfoFactory()
        Returns a KeyInfoFactory that creates KeyInfo objects. The returned KeyInfoFactory has the same mechanism type and provider as this XMLSignatureFactory.
        Returns:
        a KeyInfoFactory
        Throws:
        NoSuchMechanismException - if a KeyFactory implementation with the same mechanism type and provider is not available

      • unmarshalXMLSignature

        public abstract XMLSignature unmarshalXMLSignature(XMLValidateContext context)
                                            throws MarshalException
        Unmarshals a new XMLSignature instance from a mechanism-specific XMLValidateContext instance.
        Parameters:
        context - a mechanism-specific context from which to unmarshal the signature from
        Returns:
        the XMLSignature
        Throws:
        NullPointerException - if context is null
        ClassCastException - if the type of context is inappropriate for this factory
        MarshalException - if an unrecoverable exception occurs during unmarshalling

      • unmarshalXMLSignature

        public abstract XMLSignature unmarshalXMLSignature(XMLStructure xmlStructure)
                                            throws MarshalException
        Unmarshals a new XMLSignature instance from a mechanism-specific XMLStructure instance. This method is useful if you only want to unmarshal (and not validate) an XMLSignature.
        Parameters:
        xmlStructure - a mechanism-specific XML structure from which to unmarshal the signature from
        Returns:
        the XMLSignature
        Throws:
        NullPointerException - if xmlStructure is null
        ClassCastException - if the type of xmlStructure is inappropriate for this factory
        MarshalException - if an unrecoverable exception occurs during unmarshalling

      • isFeatureSupported

        public abstract boolean isFeatureSupported(String feature)
        Indicates whether a specified feature is supported.
        Parameters:
        feature - the feature name (as an absolute URI)
        Returns:
        true if the specified feature is supported, false otherwise
        Throws:
        NullPointerException - if feature is null

      • getURIDereferencer

        public abstract URIDereferencer getURIDereferencer()
        Returns a reference to the URIDereferencer that is used by default to dereference URIs in Reference objects.
        Returns:
        a reference to the default URIDereferencer (never null)