/*
* Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* $Id: XMLSignatureFactory.java,v 1.14 2005/09/15 14:29:01 mullan Exp $
*/
package javax.xml.crypto.dsig;
import javax.xml.crypto.Data;
import javax.xml.crypto.MarshalException;
import javax.xml.crypto.NoSuchMechanismException;
import javax.xml.crypto.URIDereferencer;
import javax.xml.crypto.XMLStructure;
import javax.xml.crypto.dom.DOMStructure;
import javax.xml.crypto.dsig.keyinfo.KeyInfo;
import javax.xml.crypto.dsig.keyinfo.KeyInfoFactory;
import javax.xml.crypto.dsig.spec.*;
import javax.xml.crypto.dsig.dom.DOMValidateContext;
import javax.xml.crypto.dsig.dom.DOMSignContext;
import java.security.InvalidAlgorithmParameterException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Provider;
import java.security.Security;
import java.util.List;
import sun.security.jca.*;
import sun.security.jca.GetInstance.Instance;
/**
* A factory for creating {@link XMLSignature} objects from scratch or
* for unmarshalling an <code>XMLSignature</code> object from a corresponding
* XML representation.
*
* <h2>XMLSignatureFactory Type</h2>
*
* <p>Each instance of <code>XMLSignatureFactory</code> supports a specific
* XML mechanism type. To create an <code>XMLSignatureFactory</code>, call one
* of the static {@link #getInstance getInstance} methods, passing in the XML
* mechanism type desired, for example:
*
* <blockquote><code>
* XMLSignatureFactory factory = XMLSignatureFactory.getInstance("DOM");
* </code></blockquote>
*
* <p>The objects that this factory produces will be based
* on DOM and abide by the DOM interoperability requirements as defined in the
* <a href="../../../../../technotes/guides/security/xmldsig/overview.html#DOM Mechanism Requirements">
* DOM Mechanism Requirements</a> section of the API overview. See the
* <a href="../../../../../technotes/guides/security/xmldsig/overview.html#Service Provider">
* Service Providers</a> section of the API overview for a list of standard
* mechanism types.
*
* <p><code>XMLSignatureFactory</code> implementations are registered and loaded
* using the {@link java.security.Provider} mechanism.
* For example, a service provider that supports the
* DOM mechanism would be specified in the <code>Provider</code> subclass as:
* <pre>
* put("XMLSignatureFactory.DOM", "org.example.DOMXMLSignatureFactory");
* </pre>
*
* <p>An implementation MUST minimally support the default mechanism type: DOM.
*
* <p>Note that a caller must use the same <code>XMLSignatureFactory</code>
* instance to create the <code>XMLStructure</code>s of a particular
* <code>XMLSignature</code> that is to be generated. The behavior is
* undefined if <code>XMLStructure</code>s from different providers or
* different mechanism types are used together.
*
* <p>Also, the <code>XMLStructure</code>s that are created by this factory
* may contain state specific to the <code>XMLSignature</code> and are not
* intended to be reusable.
*
* <h2>Creating XMLSignatures from scratch</h2>
*
* <p>Once the <code>XMLSignatureFactory</code> has been created, objects
* can be instantiated by calling the appropriate method. For example, a
* {@link Reference} instance may be created by invoking one of the
* {@link #newReference newReference} methods.
*
* <h2>Unmarshalling XMLSignatures from XML</h2>
*
* <p>Alternatively, an <code>XMLSignature</code> may be created from an
* existing XML representation by invoking the {@link #unmarshalXMLSignature
* unmarshalXMLSignature} method and passing it a mechanism-specific
* {@link XMLValidateContext} instance containing the XML content:
*
* <pre>
* DOMValidateContext context = new DOMValidateContext(key, signatureElement);
* XMLSignature signature = factory.unmarshalXMLSignature(context);
* </pre>
*
* Each <code>XMLSignatureFactory</code> must support the required
* <code>XMLValidateContext</code> types for that factory type, but may support
* others. A DOM <code>XMLSignatureFactory</code> must support {@link
* DOMValidateContext} objects.
*
* <h2>Signing and marshalling XMLSignatures to XML</h2>
*
* Each <code>XMLSignature</code> created by the factory can also be
* marshalled to an XML representation and signed, by invoking the
* {@link XMLSignature#sign sign} method of the
* {@link XMLSignature} object and passing it a mechanism-specific
* {@link XMLSignContext} object containing the signing key and
* marshalling parameters (see {@link DOMSignContext}).
* For example:
*
* <pre>
* DOMSignContext context = new DOMSignContext(privateKey, document);
* signature.sign(context);
* </pre>
*
* <b>Concurrent Access</b>
* <p>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.
*
* <p>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 <code>XMLSignatureFactory</code> instance
* concurrently should synchronize amongst themselves and provide the
* necessary locking. Multiple threads each manipulating a different
* <code>XMLSignatureFactory</code> instance need not synchronize.
*
* @author Sean Mullan
* @author JSR 105 Expert Group
* @since 1.6
*/
public abstract class XMLSignatureFactory {
private String mechanismType;
private Provider provider;
/**
* Default constructor, for invocation by subclasses.
*/
protected XMLSignatureFactory() {}
/**
* Returns an <code>XMLSignatureFactory</code> that supports the
* specified XML processing mechanism and representation type (ex: "DOM").
*
* <p>This method uses the standard JCA provider lookup mechanism to
* locate and instantiate an <code>XMLSignatureFactory</code>
* implementation of the desired mechanism type. It traverses the list of
* registered security <code>Provider</code>s, starting with the most
* preferred <code>Provider</code>. A new <code>XMLSignatureFactory</code>
* object from the first <code>Provider</code> that supports the specified
* mechanism is returned.
*
* <p>Note that the list of registered providers may be retrieved via
* the {@link Security#getProviders() Security.getProviders()} method.
*
* @param mechanismType the type of the XML processing mechanism and
* representation. See the <a
* href="../../../../../technotes/guides/security/xmldsig/overview.html#Service Provider">
* Service Providers</a> section of the API overview for a list of
* standard mechanism types.
* @return a new <code>XMLSignatureFactory</code>
* @throws NullPointerException if <code>mechanismType</code> is
* <code>null</code>
* @throws NoSuchMechanismException if no <code>Provider</code> supports an
* <code>XMLSignatureFactory</code> implementation for the specified
* mechanism
* @see Provider
*/
public static XMLSignatureFactory getInstance(String mechanismType) {
if (mechanismType == null) {
throw new NullPointerException("mechanismType cannot be null");
}
Instance instance;
try {
instance = GetInstance.getInstance
("XMLSignatureFactory", null, mechanismType);
} catch (NoSuchAlgorithmException nsae) {
throw new NoSuchMechanismException(nsae);
}
XMLSignatureFactory factory = (XMLSignatureFactory) instance.impl;
factory.mechanismType = mechanismType;
factory.provider = instance.provider;
return factory;
}
/**
* Returns an <code>XMLSignatureFactory</code> that supports the
* requested XML processing mechanism and representation type (ex: "DOM"),
* as supplied by the specified provider. Note that the specified
* <code>Provider</code> object does not have to be registered in the
* provider list.
*
* @param mechanismType the type of the XML processing mechanism and
* representation. See the <a
* href="../../../../../technotes/guides/security/xmldsig/overview.html#Service Provider">
* Service Providers</a> section of the API overview for a list of
* standard mechanism types.
* @param provider the <code>Provider</code> object
* @return a new <code>XMLSignatureFactory</code>
* @throws NullPointerException if <code>provider</code> or
* <code>mechanismType</code> is <code>null</code>
* @throws NoSuchMechanismException if an <code>XMLSignatureFactory</code>
* implementation for the specified mechanism is not available
* from the specified <code>Provider</code> object
* @see Provider
*/
public static XMLSignatureFactory getInstance(String mechanismType,
Provider provider) {
if (mechanismType == null) {
throw new NullPointerException("mechanismType cannot be null");
} else if (provider == null) {
throw new NullPointerException("provider cannot be null");
}
Instance instance;
try {
instance = GetInstance.getInstance
("XMLSignatureFactory", null, mechanismType, provider);
} catch (NoSuchAlgorithmException nsae) {
throw new NoSuchMechanismException(nsae);
}
XMLSignatureFactory factory = (XMLSignatureFactory) instance.impl;
factory.mechanismType = mechanismType;
factory.provider = instance.provider;
return factory;
}
/**
* Returns an <code>XMLSignatureFactory</code> 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.
*
* <p>Note that the list of registered providers may be retrieved via
* the {@link Security#getProviders() Security.getProviders()} method.
*
* @param mechanismType the type of the XML processing mechanism and
* representation. See the <a
* href="../../../../../technotes/guides/security/xmldsig/overview.html#Service Provider">
* Service Providers</a> section of the API overview for a list of
* standard mechanism types.
* @param provider the string name of the provider
* @return a new <code>XMLSignatureFactory</code>
* @throws NoSuchProviderException if the specified provider is not
* registered in the security provider list
* @throws NullPointerException if <code>provider</code> or
* <code>mechanismType</code> is <code>null</code>
* @throws NoSuchMechanismException if an <code>XMLSignatureFactory</code>
* implementation for the specified mechanism is not
* available from the specified provider
* @see Provider
*/
public static XMLSignatureFactory getInstance(String mechanismType,
String provider) throws NoSuchProviderException {
if (mechanismType == null) {
throw new NullPointerException("mechanismType cannot be null");
} else if (provider == null) {
throw new NullPointerException("provider cannot be null");
} else if (provider.length() == 0) {
throw new NoSuchProviderException();
}
Instance instance;
try {
instance = GetInstance.getInstance
("XMLSignatureFactory", null, mechanismType, provider);
} catch (NoSuchAlgorithmException nsae) {
throw new NoSuchMechanismException(nsae);
}
XMLSignatureFactory factory = (XMLSignatureFactory) instance.impl;
factory.mechanismType = mechanismType;
factory.provider = instance.provider;
return factory;
}
/**
* Returns an <code>XMLSignatureFactory</code> that supports the
* default XML processing mechanism and representation type ("DOM").
*
* <p>This method uses the standard JCA provider lookup mechanism to
* locate and instantiate an <code>XMLSignatureFactory</code>
* implementation of the default mechanism type. It traverses the list of
* registered security <code>Provider</code>s, starting with the most
* preferred <code>Provider</code>. A new <code>XMLSignatureFactory</code>
* object from the first <code>Provider</code> that supports the DOM
* mechanism is returned.
*
* <p>Note that the list of registered providers may be retrieved via
* the {@link Security#getProviders() Security.getProviders()} method.
*
* @return a new <code>XMLSignatureFactory</code>
* @throws NoSuchMechanismException if no <code>Provider</code> supports an
* <code>XMLSignatureFactory</code> implementation for the DOM
* mechanism
* @see Provider
*/
public static XMLSignatureFactory getInstance() {
return getInstance("DOM");
}
/**
* Returns the type of the XML processing mechanism and representation
* supported by this <code>XMLSignatureFactory</code> (ex: "DOM").
*
* @return the XML processing mechanism type supported by this
* <code>XMLSignatureFactory</code>
*/
public final String getMechanismType() {
return mechanismType;
}
/**
* Returns the provider of this <code>XMLSignatureFactory</code>.
*
* @return the provider of this <code>XMLSignatureFactory</code>
*/
public final Provider getProvider() {
return provider;
}
/**
* Creates an <code>XMLSignature</code> and initializes it with the contents
* of the specified <code>SignedInfo</code> and <code>KeyInfo</code>
* objects.
*
* @param si the signed info
* @param ki the key info (may be <code>null</code>)
* @return an <code>XMLSignature</code>
* @throws NullPointerException if <code>si</code> is <code>null</code>
*/
public abstract XMLSignature newXMLSignature(SignedInfo si, KeyInfo ki);
/**
* Creates an <code>XMLSignature</code> and initializes it with the
* specified parameters.
*
* @param si the signed info
* @param ki the key info (may be <code>null</code>)
* @param objects a list of {@link XMLObject}s (may be empty or
* <code>null</code>)
* @param id the Id (may be <code>null</code>)
* @param signatureValueId the SignatureValue Id (may be <code>null</code>)
* @return an <code>XMLSignature</code>
* @throws NullPointerException if <code>si</code> is <code>null</code>
* @throws ClassCastException if any of the <code>objects</code> are not of
* type <code>XMLObject</code>
*/
public abstract XMLSignature newXMLSignature(SignedInfo si, KeyInfo ki,
List objects, String id, String signatureValueId);
/**
* Creates a <code>Reference</code> with the specified URI and digest
* method.
*
* @param uri the reference URI (may be <code>null</code>)
* @param dm the digest method
* @return a <code>Reference</code>
* @throws IllegalArgumentException if <code>uri</code> is not RFC 2396
* compliant
* @throws NullPointerException if <code>dm</code> is <code>null</code>
*/
public abstract Reference newReference(String uri, DigestMethod dm);
/**
* Creates a <code>Reference</code> with the specified parameters.
*
* @param uri the reference URI (may be <code>null</code>)
* @param dm the digest method
* @param transforms a list of {@link Transform}s. The list is defensively
* copied to protect against subsequent modification. May be
* <code>null</code> or empty.
* @param type the reference type, as a URI (may be <code>null</code>)
* @param id the reference ID (may be <code>null</code>)
* @return a <code>Reference</code>
* @throws ClassCastException if any of the <code>transforms</code> are
* not of type <code>Transform</code>
* @throws IllegalArgumentException if <code>uri</code> is not RFC 2396
* compliant
* @throws NullPointerException if <code>dm</code> is <code>null</code>
*/
public abstract Reference newReference(String uri, DigestMethod dm,
List transforms, String type, String id);
/**
* Creates a <code>Reference</code> with the specified parameters and
* pre-calculated digest value.
*
* <p>This method is useful when the digest value of a
* <code>Reference</code> has been previously computed. See for example,
* the
* <a href="http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=dss">
* OASIS-DSS (Digital Signature Services)</a> specification.
*
* @param uri the reference URI (may be <code>null</code>)
* @param dm the digest method
* @param transforms a list of {@link Transform}s. The list is defensively
* copied to protect against subsequent modification. May be
* <code>null</code> or empty.
* @param type the reference type, as a URI (may be <code>null</code>)
* @param id the reference ID (may be <code>null</code>)
* @param digestValue the digest value. The array is cloned to protect
* against subsequent modification.
* @return a <code>Reference</code>
* @throws ClassCastException if any of the <code>transforms</code> are
* not of type <code>Transform</code>
* @throws IllegalArgumentException if <code>uri</code> is not RFC 2396
* compliant
* @throws NullPointerException if <code>dm</code> or
* <code>digestValue</code> is <code>null</code>
*/
public abstract Reference newReference(String uri, DigestMethod dm,
List transforms, String type, String id, byte[] digestValue);
/**
* Creates a <code>Reference</code> with the specified parameters.
*
* <p>This method is useful when a list of transforms have already been
* applied to the <code>Reference</code>. See for example,
* the
* <a href="http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=dss">
* OASIS-DSS (Digital Signature Services)</a> specification.
*
* <p>When an <code>XMLSignature</code> containing this reference is
* generated, the specified <code>transforms</code> (if non-null) are
* applied to the specified <code>result</code>. The
* <code>Transforms</code> element of the resulting <code>Reference</code>
* element is set to the concatenation of the
* <code>appliedTransforms</code> and <code>transforms</code>.
*
* @param uri the reference URI (may be <code>null</code>)
* @param dm the digest method
* @param appliedTransforms a list of {@link Transform}s that have
* already been applied. The list is defensively
* copied to protect against subsequent modification. The list must
* contain at least one entry.
* @param result the result of processing the sequence of
* <code>appliedTransforms</code>
* @param transforms a list of {@link Transform}s that are to be applied
* when generating the signature. The list is defensively copied to
* protect against subsequent modification. May be <code>null</code>
* or empty.
* @param type the reference type, as a URI (may be <code>null</code>)
* @param id the reference ID (may be <code>null</code>)
* @return a <code>Reference</code>
* @throws ClassCastException if any of the transforms (in either list)
* are not of type <code>Transform</code>
* @throws IllegalArgumentException if <code>uri</code> is not RFC 2396
* compliant or <code>appliedTransforms</code> is empty
* @throws NullPointerException if <code>dm</code>,
* <code>appliedTransforms</code> or <code>result</code> is
* <code>null</code>
*/
public abstract Reference newReference(String uri, DigestMethod dm,
List appliedTransforms, Data result, List transforms, String type,
String id);
/**
* Creates a <code>SignedInfo</code> with the specified canonicalization
* and signature methods, and list of one or more references.
*
* @param cm the canonicalization method
* @param sm the signature method
* @param references a list of one or more {@link Reference}s. The list is
* defensively copied to protect against subsequent modification.
* @return a <code>SignedInfo</code>
* @throws ClassCastException if any of the references are not of
* type <code>Reference</code>
* @throws IllegalArgumentException if <code>references</code> is empty
* @throws NullPointerException if any of the parameters
* are <code>null</code>
*/
public abstract SignedInfo newSignedInfo(CanonicalizationMethod cm,
SignatureMethod sm, List references);
/**
* Creates a <code>SignedInfo</code> with the specified parameters.
*
* @param cm the canonicalization method
* @param sm the signature method
* @param references a list of one or more {@link Reference}s. The list is
* defensively copied to protect against subsequent modification.
* @param id the id (may be <code>null</code>)
* @return a <code>SignedInfo</code>
* @throws ClassCastException if any of the references are not of
* type <code>Reference</code>
* @throws IllegalArgumentException if <code>references</code> is empty
* @throws NullPointerException if <code>cm</code>, <code>sm</code>, or
* <code>references</code> are <code>null</code>
*/
public abstract SignedInfo newSignedInfo(CanonicalizationMethod cm,
SignatureMethod sm, List references, String id);
// Object factory methods
/**
* Creates an <code>XMLObject</code> from the specified parameters.
*
* @param content a list of {@link XMLStructure}s. The list
* is defensively copied to protect against subsequent modification.
* May be <code>null</code> or empty.
* @param id the Id (may be <code>null</code>)
* @param mimeType the mime type (may be <code>null</code>)
* @param encoding the encoding (may be <code>null</code>)
* @return an <code>XMLObject</code>
* @throws ClassCastException if <code>content</code> contains any
* entries that are not of type {@link XMLStructure}
*/
public abstract XMLObject newXMLObject(List content, String id,
String mimeType, String encoding);
/**
* Creates a <code>Manifest</code> containing the specified
* list of {@link Reference}s.
*
* @param references a list of one or more <code>Reference</code>s. The list
* is defensively copied to protect against subsequent modification.
* @return a <code>Manifest</code>
* @throws NullPointerException if <code>references</code> is
* <code>null</code>
* @throws IllegalArgumentException if <code>references</code> is empty
* @throws ClassCastException if <code>references</code> contains any
* entries that are not of type {@link Reference}
*/
public abstract Manifest newManifest(List references);
/**
* Creates a <code>Manifest</code> containing the specified
* list of {@link Reference}s and optional id.
*
* @param references a list of one or more <code>Reference</code>s. The list
* is defensively copied to protect against subsequent modification.
* @param id the id (may be <code>null</code>)
* @return a <code>Manifest</code>
* @throws NullPointerException if <code>references</code> is
* <code>null</code>
* @throws IllegalArgumentException if <code>references</code> is empty
* @throws ClassCastException if <code>references</code> contains any
* entries that are not of type {@link Reference}
*/
public abstract Manifest newManifest(List references, String id);
/**
* Creates a <code>SignatureProperty</code> containing the specified
* list of {@link XMLStructure}s, target URI and optional id.
*
* @param content a list of one or more <code>XMLStructure</code>s. The list
* is defensively copied to protect against subsequent modification.
* @param target the target URI of the Signature that this property applies
* to
* @param id the id (may be <code>null</code>)
* @return a <code>SignatureProperty</code>
* @throws NullPointerException if <code>content</code> or
* <code>target</code> is <code>null</code>
* @throws IllegalArgumentException if <code>content</code> is empty
* @throws ClassCastException if <code>content</code> contains any
* entries that are not of type {@link XMLStructure}
*/
public abstract SignatureProperty newSignatureProperty
(List content, String target, String id);
/**
* Creates a <code>SignatureProperties</code> containing the specified
* list of {@link SignatureProperty}s and optional id.
*
* @param properties a list of one or more <code>SignatureProperty</code>s.
* The list is defensively copied to protect against subsequent
* modification.
* @param id the id (may be <code>null</code>)
* @return a <code>SignatureProperties</code>
* @throws NullPointerException if <code>properties</code>
* is <code>null</code>
* @throws IllegalArgumentException if <code>properties</code> is empty
* @throws ClassCastException if <code>properties</code> contains any
* entries that are not of type {@link SignatureProperty}
*/
public abstract SignatureProperties newSignatureProperties
(List properties, String id);
// Algorithm factory methods
/**
* Creates a <code>DigestMethod</code> for the specified algorithm URI
* and parameters.
*
* @param algorithm the URI identifying the digest algorithm
* @param params algorithm-specific digest parameters (may be
* <code>null</code>)
* @return the <code>DigestMethod</code>
* @throws InvalidAlgorithmParameterException if the specified parameters
* are inappropriate for the requested algorithm
* @throws NoSuchAlgorithmException if an implementation of the
* specified algorithm cannot be found
* @throws NullPointerException if <code>algorithm</code> is
* <code>null</code>
*/
public abstract DigestMethod newDigestMethod(String algorithm,
DigestMethodParameterSpec params) throws NoSuchAlgorithmException,
InvalidAlgorithmParameterException;
/**
* Creates a <code>SignatureMethod</code> for the specified algorithm URI
* and parameters.
*
* @param algorithm the URI identifying the signature algorithm
* @param params algorithm-specific signature parameters (may be
* <code>null</code>)
* @return the <code>SignatureMethod</code>
* @throws InvalidAlgorithmParameterException if the specified parameters
* are inappropriate for the requested algorithm
* @throws NoSuchAlgorithmException if an implementation of the
* specified algorithm cannot be found
* @throws NullPointerException if <code>algorithm</code> is
* <code>null</code>
*/
public abstract SignatureMethod newSignatureMethod(String algorithm,
SignatureMethodParameterSpec params) throws NoSuchAlgorithmException,
InvalidAlgorithmParameterException;
/**
* Creates a <code>Transform</code> for the specified algorithm URI
* and parameters.
*
* @param algorithm the URI identifying the transform algorithm
* @param params algorithm-specific transform parameters (may be
* <code>null</code>)
* @return the <code>Transform</code>
* @throws InvalidAlgorithmParameterException if the specified parameters
* are inappropriate for the requested algorithm
* @throws NoSuchAlgorithmException if an implementation of the
* specified algorithm cannot be found
* @throws NullPointerException if <code>algorithm</code> is
* <code>null</code>
*/
public abstract Transform newTransform(String algorithm,
TransformParameterSpec params) throws NoSuchAlgorithmException,
InvalidAlgorithmParameterException;
/**
* Creates a <code>Transform</code> for the specified algorithm URI
* and parameters. The parameters are specified as a mechanism-specific
* <code>XMLStructure</code> (ex: {@link DOMStructure}). This method is
* useful when the parameters are in XML form or there is no standard
* class for specifying the parameters.
*
* @param algorithm the URI identifying the transform algorithm
* @param params a mechanism-specific XML structure from which to
* unmarshal the parameters from (may be <code>null</code> if
* not required or optional)
* @return the <code>Transform</code>
* @throws ClassCastException if the type of <code>params</code> is
* inappropriate for this <code>XMLSignatureFactory</code>
* @throws InvalidAlgorithmParameterException if the specified parameters
* are inappropriate for the requested algorithm
* @throws NoSuchAlgorithmException if an implementation of the
* specified algorithm cannot be found
* @throws NullPointerException if <code>algorithm</code> is
* <code>null</code>
*/
public abstract Transform newTransform(String algorithm,
XMLStructure params) throws NoSuchAlgorithmException,
InvalidAlgorithmParameterException;
/**
* Creates a <code>CanonicalizationMethod</code> for the specified
* algorithm URI and parameters.
*
* @param algorithm the URI identifying the canonicalization algorithm
* @param params algorithm-specific canonicalization parameters (may be
* <code>null</code>)
* @return the <code>CanonicalizationMethod</code>
* @throws InvalidAlgorithmParameterException if the specified parameters
* are inappropriate for the requested algorithm
* @throws NoSuchAlgorithmException if an implementation of the
* specified algorithm cannot be found
* @throws NullPointerException if <code>algorithm</code> is
* <code>null</code>
*/
public abstract CanonicalizationMethod newCanonicalizationMethod(
String algorithm, C14NMethodParameterSpec params)
throws NoSuchAlgorithmException, InvalidAlgorithmParameterException;
/**
* Creates a <code>CanonicalizationMethod</code> for the specified
* algorithm URI and parameters. The parameters are specified as a
* mechanism-specific <code>XMLStructure</code> (ex: {@link DOMStructure}).
* This method is useful when the parameters are in XML form or there is
* no standard class for specifying the parameters.
*
* @param algorithm the URI identifying the canonicalization algorithm
* @param params a mechanism-specific XML structure from which to
* unmarshal the parameters from (may be <code>null</code> if
* not required or optional)
* @return the <code>CanonicalizationMethod</code>
* @throws ClassCastException if the type of <code>params</code> is
* inappropriate for this <code>XMLSignatureFactory</code>
* @throws InvalidAlgorithmParameterException if the specified parameters
* are inappropriate for the requested algorithm
* @throws NoSuchAlgorithmException if an implementation of the
* specified algorithm cannot be found
* @throws NullPointerException if <code>algorithm</code> is
* <code>null</code>
*/
public abstract CanonicalizationMethod newCanonicalizationMethod(
String algorithm, XMLStructure params)
throws NoSuchAlgorithmException, InvalidAlgorithmParameterException;
/**
* Returns a <code>KeyInfoFactory</code> that creates <code>KeyInfo</code>
* objects. The returned <code>KeyInfoFactory</code> has the same
* mechanism type and provider as this <code>XMLSignatureFactory</code>.
*
* @return a <code>KeyInfoFactory</code>
* @throws NoSuchMechanismException if a <code>KeyFactory</code>
* implementation with the same mechanism type and provider
* is not available
*/
public final KeyInfoFactory getKeyInfoFactory() {
return KeyInfoFactory.getInstance(getMechanismType(), getProvider());
}
/**
* Unmarshals a new <code>XMLSignature</code> instance from a
* mechanism-specific <code>XMLValidateContext</code> instance.
*
* @param context a mechanism-specific context from which to unmarshal the
* signature from
* @return the <code>XMLSignature</code>
* @throws NullPointerException if <code>context</code> is
* <code>null</code>
* @throws ClassCastException if the type of <code>context</code> is
* inappropriate for this factory
* @throws MarshalException if an unrecoverable exception occurs
* during unmarshalling
*/
public abstract XMLSignature unmarshalXMLSignature
(XMLValidateContext context) throws MarshalException;
/**
* Unmarshals a new <code>XMLSignature</code> instance from a
* mechanism-specific <code>XMLStructure</code> instance.
* This method is useful if you only want to unmarshal (and not
* validate) an <code>XMLSignature</code>.
*
* @param xmlStructure a mechanism-specific XML structure from which to
* unmarshal the signature from
* @return the <code>XMLSignature</code>
* @throws NullPointerException if <code>xmlStructure</code> is
* <code>null</code>
* @throws ClassCastException if the type of <code>xmlStructure</code> is
* inappropriate for this factory
* @throws MarshalException if an unrecoverable exception occurs
* during unmarshalling
*/
public abstract XMLSignature unmarshalXMLSignature
(XMLStructure xmlStructure) throws MarshalException;
/**
* Indicates whether a specified feature is supported.
*
* @param feature the feature name (as an absolute URI)
* @return <code>true</code> if the specified feature is supported,
* <code>false</code> otherwise
* @throws NullPointerException if <code>feature</code> is <code>null</code>
*/
public abstract boolean isFeatureSupported(String feature);
/**
* Returns a reference to the <code>URIDereferencer</code> that is used by
* default to dereference URIs in {@link Reference} objects.
*
* @return a reference to the default <code>URIDereferencer</code> (never
* <code>null</code>)
*/
public abstract URIDereferencer getURIDereferencer();
}