code: function setRDNSequence(options) {
    const encodedArray = Object.keys(options).map((k) => {
      if (Object.keys(attributeTypeOIDMap).indexOf(k) < 0) throw new Error('InvalidOptionSpecification');
  
      const type = attributeTypeOIDMap[k];
      let value;
      if (['dnQualifier, countryName, serialNumber'].indexOf(k) >= 0) {
        if (k === 'countryName' && options[k].length !== 2) throw new Error('InvalidCountryNameCode');
        value = rfc5280.DirectoryString.encode({type: 'printableString', value: options[k]}, 'der');
      }
      else value = rfc5280.DirectoryString.encode({type: 'utf8String', value: options[k]}, 'der');
  
      return {type, value};
    });
  
    return [encodedArray];
  }
docs: Set RDN sequence for issuer and subject fields
  @param {Object} options - RDN Sequence
  @return {{type: *, value: *}[][]}
  @throws {Error} - throws if InvalidOptionSpecification or InvalidCountryNameCode.