@Override public ASN1Primitive toASN1Primitive() { ASN1EncodableVector vector = new ASN1EncodableVector(); vector.add(new DERUTF8String(control.getLabel())); byte[] id = control.getId(); if (id != null) { vector.add(new DERTaggedObject(0, new DEROctetString(id))); } Set<KeyUsage> usages = control.getUsages(); if (CollectionUtil.isNonEmpty(usages)) { ASN1EncodableVector asn1Usages = new ASN1EncodableVector(); for (KeyUsage usage : usages) { int value = usageToValueMap.get(usage); asn1Usages.add(new ASN1Enumerated(value)); } vector.add(new DERTaggedObject(1, new DERSequence(asn1Usages))); } if (control.getExtractable() != null) { vector.add(new DERTaggedObject(2, ASN1Boolean.getInstance(control.getExtractable()))); } return new DERSequence(vector); }