package org.spongycastle.jcajce.provider.asymmetric.x509;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
import java.security.cert.CRL;
import java.security.cert.CRLException;
import java.security.cert.CertPath;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactorySpi;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.spongycastle.asn1.ASN1InputStream;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.ASN1Sequence;
import org.spongycastle.asn1.ASN1Set;
import org.spongycastle.asn1.ASN1TaggedObject;
import org.spongycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.spongycastle.asn1.pkcs.SignedData;
import org.spongycastle.asn1.x509.CertificateList;
import org.spongycastle.asn1.x509.X509CertificateStructure;
import org.spongycastle.jce.provider.X509CRLObject;
import org.spongycastle.jce.provider.X509CertificateObject;
/**
* class for dealing with X509 certificates.
* <p>
* At the moment this will deal with "-----BEGIN CERTIFICATE-----" to "-----END CERTIFICATE-----"
* base 64 encoded certs, as well as the BER binaries of certificates and some classes of PKCS#7
* objects.
*/
public class CertificateFactory
extends CertificateFactorySpi
{
private static final PEMUtil PEM_CERT_PARSER = new PEMUtil("CERTIFICATE");
private static final PEMUtil PEM_CRL_PARSER = new PEMUtil("CRL");
private ASN1Set sData = null;
private int sDataObjectCount = 0;
private InputStream currentStream = null;
private ASN1Set sCrlData = null;
private int sCrlDataObjectCount = 0;
private InputStream currentCrlStream = null;
private java.security.cert.Certificate readDERCertificate(
ASN1InputStream dIn)
throws IOException, CertificateParsingException
{
ASN1Sequence seq = (ASN1Sequence)dIn.readObject();
if (seq.size() > 1
&& seq.getObjectAt(0) instanceof ASN1ObjectIdentifier)
{
if (seq.getObjectAt(0).equals(PKCSObjectIdentifiers.signedData))
{
sData = SignedData.getInstance(ASN1Sequence.getInstance(
(ASN1TaggedObject)seq.getObjectAt(1), true)).getCertificates();
return getCertificate();
}
}
return new X509CertificateObject(
X509CertificateStructure.getInstance(seq));
}
private java.security.cert.Certificate getCertificate()
throws CertificateParsingException
{
if (sData != null)
{
while (sDataObjectCount < sData.size())
{
Object obj = sData.getObjectAt(sDataObjectCount++);
if (obj instanceof ASN1Sequence)
{
return new X509CertificateObject(
X509CertificateStructure.getInstance(obj));
}
}
}
return null;
}
private java.security.cert.Certificate readPEMCertificate(
InputStream in)
throws IOException, CertificateParsingException
{
ASN1Sequence seq = PEM_CERT_PARSER.readPEMObject(in);
if (seq != null)
{
return new X509CertificateObject(
X509CertificateStructure.getInstance(seq));
}
return null;
}
protected CRL createCRL(CertificateList c)
throws CRLException
{
return new X509CRLObject(c);
}
private CRL readPEMCRL(
InputStream in)
throws IOException, CRLException
{
ASN1Sequence seq = PEM_CRL_PARSER.readPEMObject(in);
if (seq != null)
{
return createCRL(
CertificateList.getInstance(seq));
}
return null;
}
private CRL readDERCRL(
ASN1InputStream aIn)
throws IOException, CRLException
{
ASN1Sequence seq = (ASN1Sequence)aIn.readObject();
if (seq.size() > 1
&& seq.getObjectAt(0) instanceof ASN1ObjectIdentifier)
{
if (seq.getObjectAt(0).equals(PKCSObjectIdentifiers.signedData))
{
sCrlData = SignedData.getInstance(ASN1Sequence.getInstance(
(ASN1TaggedObject)seq.getObjectAt(1), true)).getCRLs();
return getCRL();
}
}
return createCRL(
CertificateList.getInstance(seq));
}
private CRL getCRL()
throws CRLException
{
if (sCrlData == null || sCrlDataObjectCount >= sCrlData.size())
{
return null;
}
return createCRL(
CertificateList.getInstance(
sCrlData.getObjectAt(sCrlDataObjectCount++)));
}
/**
* Generates a certificate object and initializes it with the data
* read from the input stream inStream.
*/
public java.security.cert.Certificate engineGenerateCertificate(
InputStream in)
throws CertificateException
{
if (currentStream == null)
{
currentStream = in;
sData = null;
sDataObjectCount = 0;
}
else if (currentStream != in) // reset if input stream has changed
{
currentStream = in;
sData = null;
sDataObjectCount = 0;
}
try
{
if (sData != null)
{
if (sDataObjectCount != sData.size())
{
return getCertificate();
}
else
{
sData = null;
sDataObjectCount = 0;
return null;
}
}
PushbackInputStream pis = new PushbackInputStream(in);
int tag = pis.read();
if (tag == -1)
{
return null;
}
pis.unread(tag);
if (tag != 0x30) // assume ascii PEM encoded.
{
return readPEMCertificate(pis);
}
else
{
return readDERCertificate(new ASN1InputStream(pis));
}
}
catch (Exception e)
{
throw new ExCertificateException(e);
}
}
/**
* Returns a (possibly empty) collection view of the certificates
* read from the given input stream inStream.
*/
public Collection engineGenerateCertificates(
InputStream inStream)
throws CertificateException
{
java.security.cert.Certificate cert;
List certs = new ArrayList();
while ((cert = engineGenerateCertificate(inStream)) != null)
{
certs.add(cert);
}
return certs;
}
/**
* Generates a certificate revocation list (CRL) object and initializes
* it with the data read from the input stream inStream.
*/
public CRL engineGenerateCRL(
InputStream inStream)
throws CRLException
{
if (currentCrlStream == null)
{
currentCrlStream = inStream;
sCrlData = null;
sCrlDataObjectCount = 0;
}
else if (currentCrlStream != inStream) // reset if input stream has changed
{
currentCrlStream = inStream;
sCrlData = null;
sCrlDataObjectCount = 0;
}
try
{
if (sCrlData != null)
{
if (sCrlDataObjectCount != sCrlData.size())
{
return getCRL();
}
else
{
sCrlData = null;
sCrlDataObjectCount = 0;
return null;
}
}
PushbackInputStream pis = new PushbackInputStream(inStream);
int tag = pis.read();
if (tag == -1)
{
return null;
}
pis.unread(tag);
if (tag != 0x30) // assume ascii PEM encoded.
{
return readPEMCRL(pis);
}
else
{ // lazy evaluate to help processing of large CRLs
return readDERCRL(new ASN1InputStream(pis, true));
}
}
catch (CRLException e)
{
throw e;
}
catch (Exception e)
{
throw new CRLException(e.toString());
}
}
/**
* Returns a (possibly empty) collection view of the CRLs read from
* the given input stream inStream.
*
* The inStream may contain a sequence of DER-encoded CRLs, or
* a PKCS#7 CRL set. This is a PKCS#7 SignedData object, with the
* only signficant field being crls. In particular the signature
* and the contents are ignored.
*/
public Collection engineGenerateCRLs(
InputStream inStream)
throws CRLException
{
CRL crl;
List crls = new ArrayList();
while ((crl = engineGenerateCRL(inStream)) != null)
{
crls.add(crl);
}
return crls;
}
public Iterator engineGetCertPathEncodings()
{
return null; // TODO: PKIXCertPath.certPathEncodings.iterator();
}
public CertPath engineGenerateCertPath(
InputStream inStream)
throws CertificateException
{
return engineGenerateCertPath(inStream, "PkiPath");
}
public CertPath engineGenerateCertPath(
InputStream inStream,
String encoding)
throws CertificateException
{
return new PKIXCertPath(inStream, encoding);
}
public CertPath engineGenerateCertPath(
List certificates)
throws CertificateException
{
Iterator iter = certificates.iterator();
Object obj;
while (iter.hasNext())
{
obj = iter.next();
if (obj != null)
{
if (!(obj instanceof X509Certificate))
{
throw new CertificateException("list contains non X509Certificate object while creating CertPath\n" + obj.toString());
}
}
}
return new PKIXCertPath(certificates);
}
private class ExCertificateException
extends CertificateException
{
private Throwable cause;
public ExCertificateException(Throwable cause)
{
this.cause = cause;
}
public ExCertificateException(String msg, Throwable cause)
{
super(msg);
this.cause = cause;
}
public Throwable getCause()
{
return cause;
}
}
}