/* CertificateFactory.java -- Certificate Factory Class
Copyright (C) 1999, 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Classpath 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 for more details.
You should have received a copy of the GNU General Public License
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
Linking this library statically or dynamically with other modules is
making a combined work based on this library. Thus, the terms and
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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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independent module, the terms and conditions of the license of that
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package java.security.cert;
import gnu.java.security.Engine;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Provider;
import java.security.Security;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
/**
* This class implements the CertificateFactory class interface used to
* generate certificates, certificate revocation lists (CRLs), and certificate
* paths objects from their encoded forms.
*
* @author Mark Benvenuto
* @author Casey Marshall
* @since 1.2
* @status Fully compatible with JDK 1.4.
*/
public class CertificateFactory
{
/** The service name for certificate factories. */
private static final String CERTIFICATE_FACTORY = "CertificateFactory";
private CertificateFactorySpi certFacSpi;
private Provider provider;
private String type;
/**
* Creates an instance of CertificateFactory.
*
* @param certFacSpi The underlying CertificateFactory engine.
* @param provider The provider of this implementation.
* @param type The type of Certificate this factory creates.
*/
protected CertificateFactory(CertificateFactorySpi certFacSpi,
Provider provider, String type)
{
this.certFacSpi = certFacSpi;
this.provider = provider;
this.type = type;
}
/**
* Returns an instance of a <code>CertificateFactory</code> representing the
* specified certificate factory type.
*
* @param type The type of certificate factory to create.
* @return A <code>CertificateFactory</code> of the desired type.
* @throws CertificateException If the type of certificate factory is not
* implemented by any installed provider.
* @throws IllegalArgumentException if <code>type</code> is
* <code>null</code> or is an empty string.
*/
public static final CertificateFactory getInstance(String type)
throws CertificateException
{
Provider[] p = Security.getProviders();
CertificateException lastException = null;
for (int i = 0; i < p.length; i++)
try
{
return getInstance(type, p[i]);
}
catch (CertificateException x)
{
lastException = x;
}
if (lastException != null)
throw lastException;
throw new CertificateException(type);
}
/**
* Returns an instance of a <code>CertificateFactory</code> representing the
* specified certificate factory type from the named provider.
*
* @param type The type of certificate factory to create.
* @param provider The name of the provider to use.
* @return A <code>CertificateFactory</code> for the desired type.
* @throws CertificateException If the type of certificate is not implemented
* by the named provider.
* @throws NoSuchProviderException If the named provider is not installed.
* @throws IllegalArgumentException if either <code>type</code> or
* <code>provider</code> is <code>null</code>, or if
* <code>type</code> is an empty string.
*/
public static final CertificateFactory getInstance(String type,
String provider)
throws CertificateException, NoSuchProviderException
{
if (provider == null)
throw new IllegalArgumentException("provider MUST NOT be null");
Provider p = Security.getProvider(provider);
if (p == null)
throw new NoSuchProviderException(provider);
return getInstance(type, p);
}
/**
* Returns an instance of a <code>CertificateFactory</code> representing the
* specified certificate factory type from the designated provider.
*
* @param type The type of certificate factory to create.
* @param provider The provider from which to get the implementation.
* @return A <code>CertificateFactory</code> for the desired type.
* @throws CertificateException If the type of certificate is not implemented
* by the provider.
* @throws IllegalArgumentException if either <code>type</code> or
* <code>provider</code> is <code>null</code>, or if
* <code>type</code> is an empty string.
*/
public static final CertificateFactory getInstance(String type,
Provider provider)
throws CertificateException
{
Throwable cause;
try
{
Object spi = Engine.getInstance(CERTIFICATE_FACTORY, type, provider);
return new CertificateFactory((CertificateFactorySpi) spi, provider, type);
}
catch (ClassCastException x)
{
cause = x;
}
catch (InvocationTargetException x)
{
cause = x.getCause() != null ? x.getCause() : x;
}
catch (NoSuchAlgorithmException x)
{
cause = x;
}
CertificateException x = new CertificateException(type);
x.initCause(cause);
throw x;
}
/**
* Gets the provider of this implementation.
*
* @return The provider of this implementation.
*/
public final Provider getProvider()
{
return provider;
}
/**
* Returns the type of the certificate this factory creates.
*
* @return A string with the type of certificate
*/
public final String getType()
{
return type;
}
/**
* Generates a Certificate from the encoded data read
* from an InputStream.
*
* <p>The input stream must contain only one certificate.
*
* <p>If there exists a specialized certificate class for the
* certificate format handled by the certificate factory
* then the return Ceritificate should be a typecast of it.
* Ex: A X.509 CertificateFactory should return X509Certificate.
*
* <p>For X.509 certificates, the certificate in inStream must be
* DER encoded and supplied in binary or printable (Base64)
* encoding. If the certificate is in Base64 encoding, it must be
* bounded by -----BEGINCERTIFICATE-----, and
* -----END CERTIFICATE-----.
*
* @param inStream An input stream containing the certificate data.
* @return A certificate initialized from the decoded InputStream data.
* @throws CertificateException If an error occurs decoding the
* certificate.
*/
public final Certificate generateCertificate(InputStream inStream)
throws CertificateException
{
return certFacSpi.engineGenerateCertificate(inStream);
}
/**
* Returns a collection of certificates that were read from the
* input stream. It may be empty, have only one, or have
* multiple certificates.
*
* For a X.509 certificate factory, the stream may contain a
* single DER encoded certificate or a PKCS#7 certificate
* chain. This is a PKCS#7 <I>SignedData</I> object with the
* most significant field being <I>certificates</I>. If no
* CRLs are present, then an empty collection is returned.
*
* @param inStream An input stream containing the certificate data.
* @return A collection of certificates initialized from the decoded
* InputStream data.
* @throws CertificateException If an error occurs decoding the
* certificates.
*/
public final Collection<? extends Certificate> generateCertificates(InputStream inStream)
throws CertificateException
{
return certFacSpi.engineGenerateCertificates(inStream);
}
/**
* Generates a CRL based on the encoded data read
* from the InputStream.
*
* <p>The input stream must contain only one CRL.
*
* <p>If there exists a specialized CRL class for the
* CRL format handled by the certificate factory
* then the return CRL should be a typecast of it.
* Ex: A X.509 CertificateFactory should return X509CRL.
*
* @param inStream An input stream containing the CRL data.
* @return A CRL initialized from the decoded InputStream data.
* @throws CRLException If an error occurs decoding the CRL.
*/
public final CRL generateCRL(InputStream inStream)
throws CRLException
{
return certFacSpi.engineGenerateCRL(inStream);
}
/**
* <p>Generates CRLs based on the encoded data read
* from the InputStream.
*
* <p>For a X.509 certificate factory, the stream may contain a
* single DER encoded CRL or a PKCS#7 CRL set. This is a
* PKCS#7 <I>SignedData</I> object with the most significant
* field being <I>crls</I>. If no CRLs are present, then an
* empty collection is returned.
*
* @param inStream an input stream containing the CRLs.
* @return a collection of CRLs initialized from the decoded
* InputStream data.
* @throws CRLException If an error occurs decoding the CRLs.
*/
public final Collection<? extends CRL> generateCRLs(InputStream inStream)
throws CRLException
{
return certFacSpi.engineGenerateCRLs( inStream );
}
/**
* Generate a {@link CertPath} and initialize it with data parsed from
* the input stream. The default encoding of this factory is used.
*
* @param inStream The InputStream containing the CertPath data.
* @return A CertPath initialized from the input stream data.
* @throws CertificateException If an error occurs decoding the
* CertPath.
*/
public final CertPath generateCertPath(InputStream inStream)
throws CertificateException
{
return certFacSpi.engineGenerateCertPath(inStream);
}
/**
* Generate a {@link CertPath} and initialize it with data parsed from
* the input stream, using the specified encoding.
*
* @param inStream The InputStream containing the CertPath data.
* @param encoding The encoding of the InputStream data.
* @return A CertPath initialized from the input stream data.
* @throws CertificateException If an error occurs decoding the
* CertPath.
*/
public final CertPath generateCertPath(InputStream inStream, String encoding)
throws CertificateException
{
return certFacSpi.engineGenerateCertPath(inStream, encoding);
}
/**
* Generate a {@link CertPath} and initialize it with the certificates
* in the {@link java.util.List} argument.
*
* @param certificates The list of certificates with which to create
* the CertPath.
* @return A CertPath initialized from the certificates.
* @throws CertificateException If an error occurs generating the
* CertPath.
*/
public final CertPath generateCertPath(List<? extends Certificate> certificates)
throws CertificateException
{
return certFacSpi.engineGenerateCertPath(certificates);
}
/**
* Returns an Iterator of CertPath encodings supported by this
* factory, with the default encoding first. The returned Iterator
* cannot be modified.
*
* @return The Iterator of supported encodings.
*/
public final Iterator<String> getCertPathEncodings()
{
return certFacSpi.engineGetCertPathEncodings();
}
} // class CertificateFactory