code: public DERObject toASN1Object()
      {
          ASN1EncodableVector v = new ASN1EncodableVector();
  
          v.add(attrType);
          v.add(attrValues);
  
          return new DERSequence(v);
      }
docs: Produce an object suitable for an ASN1OutputStream.
  <pre>
  Attribute ::= SEQUENCE {
  attrType OBJECT IDENTIFIER,
  attrValues SET OF AttributeValue
  }
  </pre>