code: public DERObject toASN1Object()
      {
          ASN1EncodableVector  v = new ASN1EncodableVector();
  
          v.add(algId);
          v.add(keyData);
  
          return new DERSequence(v);
      }
docs: Produce an object suitable for an ASN1OutputStream.
  <pre>
  SubjectPublicKeyInfo ::= SEQUENCE {
  algorithm AlgorithmIdentifier,
  publicKey BIT STRING }
  </pre>