/*
* @(#)CertificateFactory.java 1.23 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program 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.
*
* This program 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 at /legal/license.txt).
*
* 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 Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
package java.security.cert;
import java.io.InputStream;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.security.Provider;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
/**
* This class defines the functionality of a certificate factory, which is
* used to generate certificate, certification path (<code>CertPath</code>)
* and certificate revocation list (CRL) objects from their encodings.
*
* <p>For encodings consisting of multiple certificates, use
* <code>generateCertificates</code> when you want to
* parse a collection of possibly unrelated certificates.
*
* <p>A certificate factory for X.509 must return certificates that are an
* instance of <code>java.security.cert.X509Certificate</code>, and CRLs
* that are an instance of <code>java.security.cert.X509CRL</code>.
*
* <p>The following example reads a file with Base64 encoded certificates,
* which are each bounded at the beginning by -----BEGIN CERTIFICATE-----, and
* bounded at the end by -----END CERTIFICATE-----. We convert the
* <code>FileInputStream</code> (which does not support <code>mark</code>
* and <code>reset</code>) to a <code>BufferedInputStream</code> (which
* supports those methods), so that each call to
* <code>generateCertificate</code> consumes only one certificate, and the
* read position of the input stream is positioned to the next certificate in
* the file:<p>
*
* <pre>
* FileInputStream fis = new FileInputStream(filename);
* BufferedInputStream bis = new BufferedInputStream(fis);
*
* CertificateFactory cf = CertificateFactory.getInstance("X.509");
*
* while (bis.available() > 0) {
* Certificate cert = cf.generateCertificate(bis);
* System.out.println(cert.toString());
* }
* </pre>
*
* <p>The following example parses a PKCS#7-formatted certificate reply stored
* in a file and extracts all the certificates from it:<p>
*
* <pre>
* FileInputStream fis = new FileInputStream(filename);
* CertificateFactory cf = CertificateFactory.getInstance("X.509");
* Collection c = cf.generateCertificates(fis);
* Iterator i = c.iterator();
* while (i.hasNext()) {
* Certificate cert = (Certificate)i.next();
* System.out.println(cert);
* }
* </pre>
*
* @author Hemma Prafullchandra
* @author Jan Luehe
* @author Sean Mullan
*
* @version 1.15, 02/02/00
*
* @see Certificate
* @see X509Certificate
* @see CertPath
* @see CRL
* @see X509CRL
*
* @since 1.2
*/
public class CertificateFactory {
// for use with the reflection API
private static final Class cl = java.security.Security.class;
private static final Class[] GET_IMPL_PARAMS = { String.class,
String.class,
String.class };
private static final Class[] GET_IMPL_PARAMS2 = { String.class,
String.class,
Provider.class };
// Get the implMethod via the name of a provider. Note: the name could
// be null.
private static Method implMethod;
// Get the implMethod2 via a Provider object.
private static Method implMethod2;
private static Boolean implMethod2Set = new Boolean(false);
static {
implMethod = (Method)
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
Method m = null;
try {
m = cl.getDeclaredMethod("getImpl", GET_IMPL_PARAMS);
if (m != null)
m.setAccessible(true);
} catch (NoSuchMethodException nsme) {
}
return m;
}
});
}
// The certificate type
private String type;
// The provider
private Provider provider;
// The provider implementation
private CertificateFactorySpi certFacSpi;
/**
* Creates a CertificateFactory object of the given type, and encapsulates
* the given provider implementation (SPI object) in it.
*
* @param certFacSpi the provider implementation.
* @param provider the provider.
* @param type the certificate type.
*/
protected CertificateFactory(CertificateFactorySpi certFacSpi,
Provider provider, String type)
{
this.certFacSpi = certFacSpi;
this.provider = provider;
this.type = type;
}
/**
* Generates a certificate factory object that implements the
* specified certificate type. If the default provider package
* provides an implementation of the requested certificate type,
* an instance of certificate factory containing that
* implementation is returned.
* If the type is not available in the default
* package, other packages are searched.
*
* @param type the name of the requested certificate type.
* See Appendix A in the <a href=
* "../../../../guide/security/CryptoSpec.html#AppA">
* Java Cryptography Architecture API Specification & Reference </a>
* for information about standard certificate types.
*
* @return a certificate factory object for the specified type.
*
* @exception CertificateException if the requested certificate type is
* not available in the default provider package or any of the other
* provider packages that were searched.
*/
public static final CertificateFactory getInstance(String type)
throws CertificateException
{
try {
if (implMethod == null) {
throw new CertificateException(type + " not found");
}
// The underlying method is static, so we set the object
// argument to null.
Object[] objs = (Object[])implMethod.invoke(null,
new Object[]
{ type,
"CertificateFactory",
null
} );
return new CertificateFactory((CertificateFactorySpi)objs[0],
(Provider)objs[1], type);
} catch (IllegalAccessException iae) {
CertificateException ce = new
CertificateException(type + " not found");
ce.initCause(iae);
throw ce;
} catch (InvocationTargetException ite) {
CertificateException ce = new
CertificateException(type + " not found");
ce.initCause(ite);
throw ce;
}
}
/**
* Generates a certificate factory object for the specified
* certificate type from the specified provider.
*
* @param type the certificate type
* @param provider the name of the provider.
*
* @return a certificate factory object for the specified type.
*
* @exception CertificateException if the certificate type is
* not available from the specified provider.
*
* @exception NoSuchProviderException if the provider has not been
* configured.
*
* @see Provider
*/
public static final CertificateFactory getInstance(String type,
String provider)
throws CertificateException, NoSuchProviderException
{
if (provider == null || provider.length() == 0)
throw new IllegalArgumentException("missing provider");
try {
if (implMethod == null) {
throw new CertificateException(type + " not found");
}
// The underlying method is static, so we set the object
// argument to null.
Object[] objs = (Object[])implMethod.invoke(null,
new Object[]
{ type,
"CertificateFactory",
provider
} );
return new CertificateFactory((CertificateFactorySpi)objs[0],
(Provider)objs[1], type);
} catch (IllegalAccessException iae) {
CertificateException ce = new
CertificateException(type + " not found");
ce.initCause(iae);
throw ce;
} catch (InvocationTargetException ite) {
Throwable t = ite.getTargetException();
if (t != null && t instanceof NoSuchProviderException)
throw (NoSuchProviderException)t;
CertificateException ce = new
CertificateException(type + " not found");
ce.initCause(ite);
throw ce;
}
}
/**
* Generates a certificate factory object for the specified
* certificate type from the specified provider.
* Note: the <code>provider</code> doesn't have to be registered.
*
* @param type the certificate type
* @param provider the provider
*
* @return a certificate factory object for the specified type.
*
* @exception CertificateException if the certificate type is
* not available from the specified provider.
*
* @exception IllegalArgumentException if the <code>provider</code> is
* null.
*
* @see Provider
*
* @since 1.4
*/
public static final CertificateFactory getInstance(String type,
Provider provider)
throws CertificateException
{
if (provider == null)
throw new IllegalArgumentException("missing provider");
if (implMethod2Set.booleanValue() == false) {
synchronized (implMethod2Set) {
if (implMethod2Set.booleanValue() == false) {
implMethod2 = (Method)
AccessController.doPrivileged(
new PrivilegedAction() {
public Object run() {
Method m = null;
try {
m = cl.getDeclaredMethod("getImpl",
GET_IMPL_PARAMS2);
if (m != null)
m.setAccessible(true);
} catch (NoSuchMethodException nsme) {
}
return m;
}
});
implMethod2Set = new Boolean(true);
}
}
}
if (implMethod2 == null) {
throw new CertificateException(type + " not found");
}
try {
// The underlying method is static, so we set the object
// argument to null.
Object[] objs = (Object[])implMethod2.invoke(null,
new Object[]
{ type,
"CertificateFactory",
provider
} );
return new CertificateFactory((CertificateFactorySpi)objs[0],
(Provider)objs[1], type);
} catch (IllegalAccessException iae) {
CertificateException ce = new
CertificateException(type + " not found");
ce.initCause(iae);
throw ce;
} catch (InvocationTargetException ite) {
CertificateException ce = new
CertificateException(type + " not found");
ce.initCause(ite);
throw ce;
}
}
/**
* Returns the provider of this certificate factory.
*
* @return the provider of this certificate factory.
*/
public final Provider getProvider() {
return this.provider;
}
/**
* Returns the name of the certificate type associated with this
* certificate factory.
*
* @return the name of the certificate type associated with this
* certificate factory.
*/
public final String getType() {
return this.type;
}
/**
* Generates a certificate object and initializes it with
* the data read from the input stream <code>inStream</code>.
*
* <p>In order to take advantage of the specialized certificate format
* supported by this certificate factory,
* the returned certificate object can be typecast to the corresponding
* certificate class. For example, if this certificate
* factory implements X.509 certificates, the returned certificate object
* can be typecast to the <code>X509Certificate</code> class.
*
* <p>In the case of a certificate factory for X.509 certificates, the
* certificate provided in <code>inStream</code> must be DER-encoded and
* may be supplied in binary or printable (Base64) encoding. If the
* certificate is provided in Base64 encoding, it must be bounded at
* the beginning by -----BEGIN CERTIFICATE-----, and must be bounded at
* the end by -----END CERTIFICATE-----.
*
* <p>Note that if the given input stream does not support
* {@link java.io.InputStream#mark(int) mark} and
* {@link java.io.InputStream#reset() reset}, this method will
* consume the entire input stream. Otherwise, each call to this
* method consumes one certificate and the read position of the
* input stream is positioned to the next available byte after
* the inherent end-of-certificate marker. If the data in the input stream
* does not contain an inherent end-of-certificate marker (other
* than EOF) and there is trailing data after the certificate is parsed, a
* <code>CertificateException</code> is thrown.
*
* @param inStream an input stream with the certificate data.
*
* @return a certificate object initialized with the data
* from the input stream.
*
* @exception CertificateException on parsing errors.
*/
public final Certificate generateCertificate(InputStream inStream)
throws CertificateException
{
return certFacSpi.engineGenerateCertificate(inStream);
}
/**
* Returns an iteration of the <code>CertPath</code> encodings supported
* by this certificate factory, with the default encoding first. See
* Appendix A in the
* <a href="../../../../guide/security/certpath/CertPathProgGuide.html#AppA">
* Java Certification Path API Programmer's Guide</a> for information about
* standard encoding names and their formats.
* <p>
* Attempts to modify the returned <code>Iterator</code> via its
* <code>remove</code> method result in an
* <code>UnsupportedOperationException</code>.
*
* @return an <code>Iterator</code> over the names of the supported
* <code>CertPath</code> encodings (as <code>String</code>s)
* @since 1.4
*/
public final Iterator getCertPathEncodings() {
return(certFacSpi.engineGetCertPathEncodings());
}
/**
* Generates a <code>CertPath</code> object and initializes it with
* the data read from the <code>InputStream</code> inStream. The data
* is assumed to be in the default encoding. The name of the default
* encoding is the first element of the <code>Iterator</code> returned by
* the {@link #getCertPathEncodings getCertPathEncodings} method.
*
* @param inStream an <code>InputStream</code> containing the data
* @return a <code>CertPath</code> initialized with the data from the
* <code>InputStream</code>
* @exception CertificateException if an exception occurs while decoding
* @since 1.4
*/
public final CertPath generateCertPath(InputStream inStream)
throws CertificateException
{
return(certFacSpi.engineGenerateCertPath(inStream));
}
/**
* Generates a <code>CertPath</code> object and initializes it with
* the data read from the <code>InputStream</code> inStream. The data
* is assumed to be in the specified encoding. See Appendix A in the
* <a href="../../../../guide/security/certpath/CertPathProgGuide.html#AppA">
* Java Certification Path API Programmer's Guide</a>
* for information about standard encoding names and their formats.
*
* @param inStream an <code>InputStream</code> containing the data
* @param encoding the encoding used for the data
* @return a <code>CertPath</code> initialized with the data from the
* <code>InputStream</code>
* @exception CertificateException if an exception occurs while decoding or
* the encoding requested is not supported
* @since 1.4
*/
public final CertPath generateCertPath(InputStream inStream,
String encoding) throws CertificateException
{
return(certFacSpi.engineGenerateCertPath(inStream, encoding));
}
/**
* Generates a <code>CertPath</code> object and initializes it with
* a <code>List</code> of <code>Certificate</code>s.
* <p>
* The certificates supplied must be of a type supported by the
* <code>CertificateFactory</code>. They will be copied out of the supplied
* <code>List</code> object.
*
* @param certificates a <code>List</code> of <code>Certificate</code>s
* @return a <code>CertPath</code> initialized with the supplied list of
* certificates
* @exception CertificateException if an exception occurs
* @since 1.4
*/
public final CertPath generateCertPath(List certificates)
throws CertificateException
{
return(certFacSpi.engineGenerateCertPath(certificates));
}
/**
* Returns a (possibly empty) collection view of the certificates read
* from the given input stream <code>inStream</code>.
*
* <p>In order to take advantage of the specialized certificate format
* supported by this certificate factory, each element in
* the returned collection view can be typecast to the corresponding
* certificate class. For example, if this certificate
* factory implements X.509 certificates, the elements in the returned
* collection can be typecast to the <code>X509Certificate</code> class.
*
* <p>In the case of a certificate factory for X.509 certificates,
* <code>inStream</code> may contain a sequence of DER-encoded certificates
* in the formats described for
* {@link #generateCertificate(java.io.InputStream) generateCertificate}.
* In addition, <code>inStream</code> may contain a PKCS#7 certificate
* chain. This is a PKCS#7 <i>SignedData</i> object, with the only
* significant field being <i>certificates</i>. In particular, the
* signature and the contents are ignored. This format allows multiple
* certificates to be downloaded at once. If no certificates are present,
* an empty collection is returned.
*
* <p>Note that if the given input stream does not support
* {@link java.io.InputStream#mark(int) mark} and
* {@link java.io.InputStream#reset() reset}, this method will
* consume the entire input stream.
*
* @param inStream the input stream with the certificates.
*
* @return a (possibly empty) collection view of
* java.security.cert.Certificate objects
* initialized with the data from the input stream.
*
* @exception CertificateException on parsing errors.
*/
public final Collection generateCertificates(InputStream inStream)
throws CertificateException
{
return certFacSpi.engineGenerateCertificates(inStream);
}
/**
* Generates a certificate revocation list (CRL) object and initializes it
* with the data read from the input stream <code>inStream</code>.
*
* <p>In order to take advantage of the specialized CRL format
* supported by this certificate factory,
* the returned CRL object can be typecast to the corresponding
* CRL class. For example, if this certificate
* factory implements X.509 CRLs, the returned CRL object
* can be typecast to the <code>X509CRL</code> class.
*
* <p>Note that if the given input stream does not support
* {@link java.io.InputStream#mark(int) mark} and
* {@link java.io.InputStream#reset() reset}, this method will
* consume the entire input stream. Otherwise, each call to this
* method consumes one CRL and the read position of the input stream
* is positioned to the next available byte after the the inherent
* end-of-CRL marker. If the data in the
* input stream does not contain an inherent end-of-CRL marker (other
* than EOF) and there is trailing data after the CRL is parsed, a
* <code>CRLException</code> is thrown.
*
* @param inStream an input stream with the CRL data.
*
* @return a CRL object initialized with the data
* from the input stream.
*
* @exception CRLException on parsing errors.
*/
public final CRL generateCRL(InputStream inStream)
throws CRLException
{
return certFacSpi.engineGenerateCRL(inStream);
}
/**
* Returns a (possibly empty) collection view of the CRLs read
* from the given input stream <code>inStream</code>.
*
* <p>In order to take advantage of the specialized CRL format
* supported by this certificate factory, each element in
* the returned collection view can be typecast to the corresponding
* CRL class. For example, if this certificate
* factory implements X.509 CRLs, the elements in the returned
* collection can be typecast to the <code>X509CRL</code> class.
*
* <p>In the case of a certificate factory for X.509 CRLs,
* <code>inStream</code> may contain a sequence of DER-encoded CRLs.
* In addition, <code>inStream</code> may contain a PKCS#7 CRL
* set. This is a PKCS#7 <i>SignedData</i> object, with the only
* significant field being <i>crls</i>. In particular, the
* signature and the contents are ignored. This format allows multiple
* CRLs to be downloaded at once. If no CRLs are present,
* an empty collection is returned.
*
* <p>Note that if the given input stream does not support
* {@link java.io.InputStream#mark(int) mark} and
* {@link java.io.InputStream#reset() reset}, this method will
* consume the entire input stream.
*
* @param inStream the input stream with the CRLs.
*
* @return a (possibly empty) collection view of
* java.security.cert.CRL objects initialized with the data from the input
* stream.
*
* @exception CRLException on parsing errors.
*/
public final Collection generateCRLs(InputStream inStream)
throws CRLException
{
return certFacSpi.engineGenerateCRLs(inStream);
}
}