Java tutorial
package org.bouncycastle.asn1.x509; import org.bouncycastle.asn1.ASN1EncodableVector; import org.bouncycastle.asn1.ASN1Integer; import org.bouncycastle.asn1.ASN1UTCTime; import org.bouncycastle.asn1.DERBitString; import org.bouncycastle.asn1.DERSequence; import org.bouncycastle.asn1.DERTaggedObject; import org.bouncycastle.asn1.x500.X500Name; /** * Generator for Version 3 TBSCertificateStructures. * <pre> * TBSCertificate ::= SEQUENCE { * version [ 0 ] Version DEFAULT v1(0), * serialNumber CertificateSerialNumber, * signature AlgorithmIdentifier, * issuer Name, * validity Validity, * subject Name, * subjectPublicKeyInfo SubjectPublicKeyInfo, * issuerUniqueID [ 1 ] IMPLICIT UniqueIdentifier OPTIONAL, * subjectUniqueID [ 2 ] IMPLICIT UniqueIdentifier OPTIONAL, * extensions [ 3 ] Extensions OPTIONAL * } * </pre> * */ public class V3TBSCertificateGenerator { DERTaggedObject version = new DERTaggedObject(true, 0, new ASN1Integer(2)); ASN1Integer serialNumber; AlgorithmIdentifier signature; X500Name issuer; Time startDate, endDate; X500Name subject; SubjectPublicKeyInfo subjectPublicKeyInfo; Extensions extensions; private boolean altNamePresentAndCritical; private DERBitString issuerUniqueID; private DERBitString subjectUniqueID; public V3TBSCertificateGenerator() { } public void setSerialNumber(ASN1Integer serialNumber) { this.serialNumber = serialNumber; } public void setSignature(AlgorithmIdentifier signature) { this.signature = signature; } /** * @deprecated use X500Name method */ public void setIssuer(X509Name issuer) { this.issuer = X500Name.getInstance(issuer); } public void setIssuer(X500Name issuer) { this.issuer = issuer; } public void setStartDate(ASN1UTCTime startDate) { this.startDate = new Time(startDate); } public void setStartDate(Time startDate) { this.startDate = startDate; } public void setEndDate(ASN1UTCTime endDate) { this.endDate = new Time(endDate); } public void setEndDate(Time endDate) { this.endDate = endDate; } /** * @deprecated use X500Name method */ public void setSubject(X509Name subject) { this.subject = X500Name.getInstance(subject.toASN1Primitive()); } public void setSubject(X500Name subject) { this.subject = subject; } public void setIssuerUniqueID(DERBitString uniqueID) { this.issuerUniqueID = uniqueID; } public void setSubjectUniqueID(DERBitString uniqueID) { this.subjectUniqueID = uniqueID; } public void setSubjectPublicKeyInfo(SubjectPublicKeyInfo pubKeyInfo) { this.subjectPublicKeyInfo = pubKeyInfo; } /** * @deprecated use method taking Extensions * @param extensions */ public void setExtensions(X509Extensions extensions) { setExtensions(Extensions.getInstance(extensions)); } public void setExtensions(Extensions extensions) { this.extensions = extensions; if (extensions != null) { Extension altName = extensions.getExtension(Extension.subjectAlternativeName); if (altName != null && altName.isCritical()) { altNamePresentAndCritical = true; } } } public TBSCertificate generateTBSCertificate() { if ((serialNumber == null) || (signature == null) || (issuer == null) || (startDate == null) || (endDate == null) || (subject == null && !altNamePresentAndCritical) || (subjectPublicKeyInfo == null)) { throw new IllegalStateException("not all mandatory fields set in V3 TBScertificate generator"); } ASN1EncodableVector v = new ASN1EncodableVector(10); v.add(version); v.add(serialNumber); v.add(signature); v.add(issuer); // // before and after dates // { ASN1EncodableVector validity = new ASN1EncodableVector(2); validity.add(startDate); validity.add(endDate); v.add(new DERSequence(validity)); } if (subject != null) { v.add(subject); } else { v.add(new DERSequence()); } v.add(subjectPublicKeyInfo); if (issuerUniqueID != null) { v.add(new DERTaggedObject(false, 1, issuerUniqueID)); } if (subjectUniqueID != null) { v.add(new DERTaggedObject(false, 2, subjectUniqueID)); } if (extensions != null) { v.add(new DERTaggedObject(true, 3, extensions)); } return TBSCertificate.getInstance(new DERSequence(v)); } }