Produce an object suitable for an ASN1OutputStream.
IssuerSerial ::= SEQUENCE {
issuer GeneralNames,
serial CertificateSerialNumber,
issuerUID UniqueIdentifier OPTIONAL
}
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(issuer);
v.add(serial);
if (issuerUID != null)
{
v.add(issuerUID);
}
return new DERSequence(v);