JDK 11 java.xml.crypto.jmod - XML Crypto Module

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javax/xml/crypto/dsig/XMLSignatureFactory.java

/*
 * Copyright (c) 2005, 2017, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */
/*
 * $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.Provider.Service;
import java.security.Security;
import java.util.List;


/**
 * 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
 * {@extLink security_guide_xmldsig_rqmts DOM Mechanism Requirements} section
 * of the API overview. See the
 * {@extLink security_guide_xmldsig_provider Service Providers} 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.
     *
     * @implNote
     * The JDK Reference Implementation additionally uses the
     * {@code jdk.security.provider.preferred}
     * {@link Security#getProperty(String) Security} property to determine
     * the preferred provider order for the specified algorithm. This
     * may be different than the order of providers returned by
     * {@link Security#getProviders() Security.getProviders()}.
     *
     * @param mechanismType the type of the XML processing mechanism and
     *    representation. See the {@extLink security_guide_xmldsig_provider
     *    Service Providers} 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");
        }
        Provider[] provs = Security.getProviders();
        for (Provider p : provs) {
            Service s = p.getService("XMLSignatureFactory", mechanismType);
            if (s != null) {
                Object obj = null;
                try {
                    obj = s.newInstance(null);
                } catch (NoSuchAlgorithmException nsae) {
                    throw new NoSuchMechanismException(nsae);
                }
                if (obj instanceof XMLSignatureFactory) {
                    XMLSignatureFactory factory = (XMLSignatureFactory) obj;
                    factory.mechanismType = mechanismType;
                    factory.provider = p;
                    return factory;
                }
            }
        }
        throw new NoSuchMechanismException
            ("Mechanism " + mechanismType + " not available");
    }

    /**
     * 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 {@extLink security_guide_xmldsig_provider
     *    Service Providers} 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");
        }

        Service s = provider.getService("XMLSignatureFactory", mechanismType);
        if (s != null) {
            Object obj = null;
            try {
                obj = s.newInstance(null);
            } catch (NoSuchAlgorithmException nsae) {
                throw new NoSuchMechanismException(nsae);
            }

            if (obj instanceof XMLSignatureFactory) {
                XMLSignatureFactory factory = (XMLSignatureFactory) obj;
                factory.mechanismType = mechanismType;
                factory.provider = provider;
                return factory;
            }
        }
        throw new NoSuchMechanismException
            ("Mechanism " + mechanismType + " not available from " +
             provider.getName());
    }

    /**
     * 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 {@extLink security_guide_xmldsig_provider
     *    Service Providers} 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();
        }

        Provider p = Security.getProvider(provider);
        if (p == null) {
            throw new NoSuchProviderException("No such provider: " +
                                              provider);
        }
        Service s = p.getService("XMLSignatureFactory", mechanismType);
        if (s != null) {
            Object obj = null;
            try {
                obj = s.newInstance(null);
            } catch (NoSuchAlgorithmException nsae) {
                throw new NoSuchMechanismException(nsae);
            }
            if (obj instanceof XMLSignatureFactory) {
                XMLSignatureFactory factory = (XMLSignatureFactory) obj;
                factory.mechanismType = mechanismType;
                factory.provider = p;
                return factory;
            }
        }
        throw new NoSuchMechanismException
            ("Mechanism " + mechanismType + " not available from " + provider);
    }

    /**
     * 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<? extends XMLObject> 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<? extends Transform> 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<? extends Transform> 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<? extends Transform> appliedTransforms, Data result,
        List<? extends Transform> 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<? extends Reference> 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<? extends Reference> 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<? extends XMLStructure> 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<? extends Reference> 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<? extends Reference> 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<? extends XMLStructure> 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<? extends SignatureProperty> 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();
}

javax/xml/crypto/dsig/XMLSignatureFactory.java

 

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