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package org.bouncycastle.cert;
import java.io.IOException;
import java.io.OutputStream;
import java.math.BigInteger;
import java.util.Date;
import java.util.Enumeration;
import java.util.Locale;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.Certificate;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.Extensions;
import org.bouncycastle.asn1.x509.ExtensionsGenerator;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.asn1.x509.TBSCertificate;
import org.bouncycastle.asn1.x509.Time;
import org.bouncycastle.asn1.x509.V3TBSCertificateGenerator;
import org.bouncycastle.operator.ContentSigner;
/**
* class to produce an X.509 Version 3 certificate.
*/
public class X509v3CertificateBuilder
{
private V3TBSCertificateGenerator tbsGen;
private ExtensionsGenerator extGenerator;
/**
* Create a builder for a version 3 certificate.
*
* @param issuer the certificate issuer
* @param serial the certificate serial number
* @param notBefore the date before which the certificate is not valid
* @param notAfter the date after which the certificate is not valid
* @param subject the certificate subject
* @param publicKeyInfo the info structure for the public key to be associated with this certificate.
*/
public X509v3CertificateBuilder(X500Name issuer, BigInteger serial, Date notBefore, Date notAfter, X500Name subject, SubjectPublicKeyInfo publicKeyInfo)
{
this(issuer, serial, new Time(notBefore), new Time(notAfter), subject, publicKeyInfo);
}
/**
* Create a builder for a version 3 certificate. You may need to use this constructor if the default locale
* doesn't use a Gregorian calender so that the Time produced is compatible with other ASN.1 implementations.
*
* @param issuer the certificate issuer
* @param serial the certificate serial number
* @param notBefore the date before which the certificate is not valid
* @param notAfter the date after which the certificate is not valid
* @param dateLocale locale to be used for date interpretation.
* @param subject the certificate subject
* @param publicKeyInfo the info structure for the public key to be associated with this certificate.
*/
public X509v3CertificateBuilder(X500Name issuer, BigInteger serial, Date notBefore, Date notAfter, Locale dateLocale, X500Name subject, SubjectPublicKeyInfo publicKeyInfo)
{
this(issuer, serial, new Time(notBefore, dateLocale), new Time(notAfter, dateLocale), subject, publicKeyInfo);
}
/**
* Create a builder for a version 3 certificate.
*
* @param issuer the certificate issuer
* @param serial the certificate serial number
* @param notBefore the Time before which the certificate is not valid
* @param notAfter the Time after which the certificate is not valid
* @param subject the certificate subject
* @param publicKeyInfo the info structure for the public key to be associated with this certificate.
*/
public X509v3CertificateBuilder(X500Name issuer, BigInteger serial, Time notBefore, Time notAfter, X500Name subject, SubjectPublicKeyInfo publicKeyInfo)
{
tbsGen = new V3TBSCertificateGenerator();
tbsGen.setSerialNumber(new ASN1Integer(serial));
tbsGen.setIssuer(issuer);
tbsGen.setStartDate(notBefore);
tbsGen.setEndDate(notAfter);
tbsGen.setSubject(subject);
tbsGen.setSubjectPublicKeyInfo(publicKeyInfo);
extGenerator = new ExtensionsGenerator();
}
/**
* Create a builder for a version 3 certificate, initialised with another certificate.
*
* @param template template certificate to base the new one on.
*/
public X509v3CertificateBuilder(X509CertificateHolder template)
{
tbsGen = new V3TBSCertificateGenerator();
tbsGen.setSerialNumber(new ASN1Integer(template.getSerialNumber()));
tbsGen.setIssuer(template.getIssuer());
tbsGen.setStartDate(new Time(template.getNotBefore()));
tbsGen.setEndDate(new Time(template.getNotAfter()));
tbsGen.setSubject(template.getSubject());
tbsGen.setSubjectPublicKeyInfo(template.getSubjectPublicKeyInfo());
extGenerator = new ExtensionsGenerator();
Extensions exts = template.getExtensions();
for (Enumeration en = exts.oids(); en.hasMoreElements();)
{
extGenerator.addExtension(exts.getExtension((ASN1ObjectIdentifier)en.nextElement()));
}
}
/**
* Return if the extension indicated by OID is present.
*
* @param oid the OID for the extension of interest.
* @return the Extension, or null if it is not present.
*/
public boolean hasExtension(ASN1ObjectIdentifier oid)
{
return doGetExtension(oid) != null;
}
/**
* Return the current value of the extension for OID.
*
* @param oid the OID for the extension we want to fetch.
* @return true if a matching extension is present, false otherwise.
*/
public Extension getExtension(ASN1ObjectIdentifier oid)
{
return doGetExtension(oid);
}
private Extension doGetExtension(ASN1ObjectIdentifier oid)
{
Extensions exts = extGenerator.generate();
return exts.getExtension(oid);
}
/**
* Set the subjectUniqueID - note: it is very rare that it is correct to do this.
*
* @param uniqueID a boolean array representing the bits making up the subjectUniqueID.
* @return this builder object.
*/
public X509v3CertificateBuilder setSubjectUniqueID(boolean[] uniqueID)
{
tbsGen.setSubjectUniqueID(booleanToBitString(uniqueID));
return this;
}
/**
* Set the issuerUniqueID - note: it is very rare that it is correct to do this.
*
* @param uniqueID a boolean array representing the bits making up the issuerUniqueID.
* @return this builder object.
*/
public X509v3CertificateBuilder setIssuerUniqueID(boolean[] uniqueID)
{
tbsGen.setIssuerUniqueID(booleanToBitString(uniqueID));
return this;
}
/**
* Add a given extension field for the standard extensions tag (tag 3)
*
* @param oid the OID defining the extension type.
* @param isCritical true if the extension is critical, false otherwise.
* @param value the ASN.1 structure that forms the extension's value.
* @return this builder object.
* @throws CertIOException if there is an issue with the new extension value.
* @throws IllegalArgumentException if the OID oid has already been used.
*/
public X509v3CertificateBuilder addExtension(
ASN1ObjectIdentifier oid,
boolean isCritical,
ASN1Encodable value)
throws CertIOException
{
try
{
extGenerator.addExtension(oid, isCritical, value);
}
catch (IOException e)
{
throw new CertIOException("cannot encode extension: " + e.getMessage(), e);
}
return this;
}
/**
* Add a given extension field for the standard extensions tag (tag 3).
*
* @param extension the full extension value.
* @return this builder object.
* @throws CertIOException if there is an issue with the new extension value.
* @throws IllegalArgumentException if the OID oid has already been used.
*/
public X509v3CertificateBuilder addExtension(
Extension extension)
throws CertIOException
{
extGenerator.addExtension(extension);
return this;
}
/**
* Add a given extension field for the standard extensions tag (tag 3) using a byte encoding of the
* extension value.
*
* @param oid the OID defining the extension type.
* @param isCritical true if the extension is critical, false otherwise.
* @param encodedValue a byte array representing the encoding of the extension value.
* @return this builder object.
* @throws CertIOException if there is an issue with the new extension value.
* @throws IllegalArgumentException if the OID oid has already been allocated.
*/
public X509v3CertificateBuilder addExtension(
ASN1ObjectIdentifier oid,
boolean isCritical,
byte[] encodedValue)
throws CertIOException
{
extGenerator.addExtension(oid, isCritical, encodedValue);
return this;
}
/**
* Replace the extension field for the passed in extension's extension ID
* with a new version.
*
* @param oid the OID defining the extension type.
* @param isCritical true if the extension is critical, false otherwise.
* @param value the ASN.1 structure that forms the extension's value.
* @return this builder object.
* @throws CertIOException if there is an issue with the new extension value.
* @throws IllegalArgumentException if the extension to be replaced is not present.
*/
public X509v3CertificateBuilder replaceExtension(
ASN1ObjectIdentifier oid,
boolean isCritical,
ASN1Encodable value)
throws CertIOException
{
try
{
extGenerator = CertUtils.doReplaceExtension(extGenerator, new Extension(oid, isCritical, value.toASN1Primitive().getEncoded(ASN1Encoding.DER)));
}
catch (IOException e)
{
throw new CertIOException("cannot encode extension: " + e.getMessage(), e);
}
return this;
}
/**
* Replace the extension field for the passed in extension's extension ID
* with a new version.
*
* @param extension the full extension value.
* @return this builder object.
* @throws CertIOException if there is an issue with the new extension value.
* @throws IllegalArgumentException if the extension to be replaced is not present.
*/
public X509v3CertificateBuilder replaceExtension(
Extension extension)
throws CertIOException
{
extGenerator = CertUtils.doReplaceExtension(extGenerator, extension);
return this;
}
/**
* Replace a given extension field for the standard extensions tag (tag 3) with the passed in
* byte encoded extension value.
*
* @param oid the OID defining the extension type.
* @param isCritical true if the extension is critical, false otherwise.
* @param encodedValue a byte array representing the encoding of the extension value.
* @return this builder object.
* @throws CertIOException if there is an issue with the new extension value.
* @throws IllegalArgumentException if the extension to be replaced is not present.
*/
public X509v3CertificateBuilder replaceExtension(
ASN1ObjectIdentifier oid,
boolean isCritical,
byte[] encodedValue)
throws CertIOException
{
extGenerator = CertUtils.doReplaceExtension(extGenerator, new Extension(oid, isCritical, encodedValue));
return this;
}
/**
* Remove the extension indicated by OID.
*
* @param oid the OID of the extension to be removed.
* @return this builder object.
* @throws IllegalArgumentException if the extension to be removed is not present.
*/
public X509v3CertificateBuilder removeExtension(ASN1ObjectIdentifier oid)
{
extGenerator = CertUtils.doRemoveExtension(extGenerator, oid);
return this;
}
/**
* Add a given extension field for the standard extensions tag (tag 3)
* copying the extension value from another certificate.
*
* @param oid the OID defining the extension type.
* @param isCritical true if the copied extension is to be marked as critical, false otherwise.
* @param certHolder the holder for the certificate that the extension is to be copied from.
* @return this builder object.
*/
public X509v3CertificateBuilder copyAndAddExtension(
ASN1ObjectIdentifier oid,
boolean isCritical,
X509CertificateHolder certHolder)
{
Certificate cert = certHolder.toASN1Structure();
Extension extension = cert.getTBSCertificate().getExtensions().getExtension(oid);
if (extension == null)
{
throw new NullPointerException("extension " + oid + " not present");
}
extGenerator.addExtension(oid, isCritical, extension.getExtnValue().getOctets());
return this;
}
/**
* Generate an X.509 certificate, based on the current issuer and subject
* using the passed in signer.
*
* @param signer the content signer to be used to generate the signature validating the certificate.
* @return a holder containing the resulting signed certificate.
*/
public X509CertificateHolder build(
ContentSigner signer)
{
tbsGen.setSignature(signer.getAlgorithmIdentifier());
if (!extGenerator.isEmpty())
{
tbsGen.setExtensions(extGenerator.generate());
}
try
{
TBSCertificate tbsCert = tbsGen.generateTBSCertificate();
return new X509CertificateHolder(generateStructure(tbsCert, signer.getAlgorithmIdentifier(), generateSig(signer, tbsCert)));
}
catch (IOException e)
{
throw new IllegalArgumentException("cannot produce certificate signature");
}
}
private static byte[] generateSig(ContentSigner signer, ASN1Object tbsObj)
throws IOException
{
OutputStream sOut = signer.getOutputStream();
tbsObj.encodeTo(sOut, ASN1Encoding.DER);
sOut.close();
return signer.getSignature();
}
private static Certificate generateStructure(TBSCertificate tbsCert, AlgorithmIdentifier sigAlgId, byte[] signature)
{
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(tbsCert);
v.add(sigAlgId);
v.add(new DERBitString(signature));
return Certificate.getInstance(new DERSequence(v));
}
static DERBitString booleanToBitString(boolean[] id)
{
byte[] bytes = new byte[(id.length + 7) / 8];
for (int i = 0; i != id.length; i++)
{
bytes[i / 8] |= (id[i]) ? (1 << ((7 - (i % 8)))) : 0;
}
int pad = id.length % 8;
if (pad == 0)
{
return new DERBitString(bytes);
}
else
{
return new DERBitString(bytes, 8 - pad);
}
}
}
