package org.bouncycastle.x509;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Signature;
import java.security.SignatureException;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;
import java.util.Date;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Vector;
import javax.security.auth.x500.X500Principal;
import org.bouncycastle.asn1.*;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.asn1.x509.TBSCertificateStructure;
import org.bouncycastle.asn1.x509.Time;
import org.bouncycastle.asn1.x509.V3TBSCertificateGenerator;
import org.bouncycastle.asn1.x509.X509CertificateStructure;
import org.bouncycastle.asn1.x509.X509Extension;
import org.bouncycastle.asn1.x509.X509Extensions;
import org.bouncycastle.asn1.x509.X509Name;
import org.bouncycastle.jce.X509Principal;
import org.bouncycastle.jce.provider.X509CertificateObject;
import org.bouncycastle.x509.extension.X509ExtensionUtil;
/**
* class to produce an X.509 Version 3 certificate.
*/
public class X509V3CertificateGenerator
{
private V3TBSCertificateGenerator tbsGen;
private DERObjectIdentifier sigOID;
private AlgorithmIdentifier sigAlgId;
private String signatureAlgorithm;
private Hashtable extensions = null;
private Vector extOrdering = null;
public X509V3CertificateGenerator()
{
tbsGen = new V3TBSCertificateGenerator();
}
/**
* reset the generator
*/
public void reset()
{
tbsGen = new V3TBSCertificateGenerator();
extensions = null;
extOrdering = null;
}
/**
* set the serial number for the certificate.
*/
public void setSerialNumber(
BigInteger serialNumber)
{
if (serialNumber.compareTo(BigInteger.ZERO) <= 0)
{
throw new IllegalArgumentException("serial number must be a positive integer");
}
tbsGen.setSerialNumber(new DERInteger(serialNumber));
}
/**
* Set the issuer distinguished name - the issuer is the entity whose private key is used to sign the
* certificate.
*/
public void setIssuerDN(
X500Principal issuer)
{
try
{
tbsGen.setIssuer(new X509Principal(issuer.getEncoded()));
}
catch (IOException e)
{
throw new IllegalArgumentException("can't process principal: " + e);
}
}
/**
* Set the issuer distinguished name - the issuer is the entity whose private key is used to sign the
* certificate.
*/
public void setIssuerDN(
X509Name issuer)
{
tbsGen.setIssuer(issuer);
}
public void setNotBefore(
Date date)
{
tbsGen.setStartDate(new Time(date));
}
public void setNotAfter(
Date date)
{
tbsGen.setEndDate(new Time(date));
}
/**
* Set the subject distinguished name. The subject describes the entity associated with the public key.
*/
public void setSubjectDN(
X500Principal subject)
{
try
{
tbsGen.setSubject(new X509Principal(subject.getEncoded()));
}
catch (IOException e)
{
throw new IllegalArgumentException("can't process principal: " + e);
}
}
/**
* Set the subject distinguished name. The subject describes the entity associated with the public key.
*/
public void setSubjectDN(
X509Name subject)
{
tbsGen.setSubject(subject);
}
public void setPublicKey(
PublicKey key)
{
try
{
tbsGen.setSubjectPublicKeyInfo(new SubjectPublicKeyInfo((ASN1Sequence)new ASN1InputStream(
new ByteArrayInputStream(key.getEncoded())).readObject()));
}
catch (Exception e)
{
throw new IllegalArgumentException("unable to process key - " + e.toString());
}
}
/**
* Set the signature algorithm. This can be either a name or an OID, names
* are treated as case insensitive.
*
* @param signatureAlgorithm string representation of the algorithm name.
*/
public void setSignatureAlgorithm(
String signatureAlgorithm)
{
this.signatureAlgorithm = signatureAlgorithm;
try
{
sigOID = X509Util.getAlgorithmOID(signatureAlgorithm);
}
catch (Exception e)
{
throw new IllegalArgumentException("Unknown signature type requested: " + signatureAlgorithm);
}
sigAlgId = X509Util.getSigAlgID(sigOID);
tbsGen.setSignature(sigAlgId);
}
/**
* add a given extension field for the standard extensions tag (tag 3)
*/
public void addExtension(
String oid,
boolean critical,
DEREncodable value)
{
this.addExtension(new DERObjectIdentifier(oid), critical, value);
}
/**
* add a given extension field for the standard extensions tag (tag 3)
*/
public void addExtension(
DERObjectIdentifier oid,
boolean critical,
DEREncodable value)
{
if (extensions == null)
{
extensions = new Hashtable();
extOrdering = new Vector();
}
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
DEROutputStream dOut = new DEROutputStream(bOut);
try
{
dOut.writeObject(value);
}
catch (IOException e)
{
throw new IllegalArgumentException("error encoding value: " + e);
}
this.addExtension(oid, critical, bOut.toByteArray());
}
/**
* add a given extension field for the standard extensions tag (tag 3)
* The value parameter becomes the contents of the octet string associated
* with the extension.
*/
public void addExtension(
String oid,
boolean critical,
byte[] value)
{
this.addExtension(new DERObjectIdentifier(oid), critical, value);
}
/**
* add a given extension field for the standard extensions tag (tag 3)
*/
public void addExtension(
DERObjectIdentifier oid,
boolean critical,
byte[] value)
{
if (extensions == null)
{
extensions = new Hashtable();
extOrdering = new Vector();
}
extensions.put(oid, new X509Extension(critical, new DEROctetString(value)));
extOrdering.addElement(oid);
}
/**
* add a given extension field for the standard extensions tag (tag 3)
* copying the extension value from another certificate.
* @throws CertificateParsingException if the extension cannot be extracted.
*/
public void copyAndAddExtension(
String oid,
boolean critical,
X509Certificate cert)
throws CertificateParsingException
{
byte[] extValue = cert.getExtensionValue(oid);
if (extValue == null)
{
throw new CertificateParsingException("extension " + oid + " not present");
}
try
{
ASN1Encodable value = X509ExtensionUtil.fromExtensionValue(extValue);
this.addExtension(oid, critical, value);
}
catch (IOException e)
{
throw new CertificateParsingException(e.toString());
}
}
/**
* add a given extension field for the standard extensions tag (tag 3)
* copying the extension value from another certificate.
* @throws CertificateParsingException if the extension cannot be extracted.
*/
public void copyAndAddExtension(
DERObjectIdentifier oid,
boolean critical,
X509Certificate cert)
throws CertificateParsingException
{
this.copyAndAddExtension(oid.getId(), critical, cert);
}
/**
* generate an X509 certificate, based on the current issuer and subject
* using the default provider "BC".
*/
public X509Certificate generateX509Certificate(
PrivateKey key)
throws SecurityException, SignatureException, InvalidKeyException
{
try
{
return generateX509Certificate(key, "BC", null);
}
catch (NoSuchProviderException e)
{
throw new SecurityException("BC provider not installed!");
}
}
/**
* generate an X509 certificate, based on the current issuer and subject
* using the default provider "BC", and the passed in source of randomness
* (if required).
*/
public X509Certificate generateX509Certificate(
PrivateKey key,
SecureRandom random)
throws SecurityException, SignatureException, InvalidKeyException
{
try
{
return generateX509Certificate(key, "BC", random);
}
catch (NoSuchProviderException e)
{
throw new SecurityException("BC provider not installed!");
}
}
/**
* generate an X509 certificate, based on the current issuer and subject,
* using the passed in provider for the signing.
*/
public X509Certificate generateX509Certificate(
PrivateKey key,
String provider)
throws NoSuchProviderException, SecurityException, SignatureException, InvalidKeyException
{
return generateX509Certificate(key, provider, null);
}
/**
* generate an X509 certificate, based on the current issuer and subject,
* using the passed in provider for the signing and the supplied source
* of randomness, if required.
*/
public X509Certificate generateX509Certificate(
PrivateKey key,
String provider,
SecureRandom random)
throws NoSuchProviderException, SecurityException, SignatureException, InvalidKeyException
{
Signature sig = null;
if (sigOID == null)
{
throw new IllegalStateException("no signature algorithm specified");
}
try
{
sig = Signature.getInstance(sigOID.getId(), provider);
}
catch (NoSuchAlgorithmException ex)
{
try
{
sig = Signature.getInstance(signatureAlgorithm, provider);
}
catch (NoSuchAlgorithmException e)
{
throw new SecurityException("exception creating signature: " + e.toString());
}
}
if (random != null)
{
sig.initSign(key, random);
}
else
{
sig.initSign(key);
}
if (extensions != null)
{
tbsGen.setExtensions(new X509Extensions(extOrdering, extensions));
}
TBSCertificateStructure tbsCert = tbsGen.generateTBSCertificate();
try
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
DEROutputStream dOut = new DEROutputStream(bOut);
dOut.writeObject(tbsCert);
sig.update(bOut.toByteArray());
}
catch (Exception e)
{
throw new SecurityException("exception encoding TBS cert - " + e);
}
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(tbsCert);
v.add(sigAlgId);
v.add(new DERBitString(sig.sign()));
return new X509CertificateObject(new X509CertificateStructure(new DERSequence(v)));
}
/**
* Return an iterator of the signature names supported by the generator.
*
* @return an iterator containing recognised names.
*/
public Iterator getSignatureAlgNames()
{
return X509Util.getAlgNames();
}
}