*
     * [rfc_2818]: https://tools.ietf.org/html/rfc2818
     */
    fun commonName(cn: String) =
      apply {
        this.commonName = cn
      }

    /** Sets the certificate's organizational unit (OU). If unset this field will be omitted. */
    fun organizationalUnit(ou: String) =
      apply {
        this.organizationalUnit = ou
      }

// jobs : https://www.iana.org/domains/root/db/jobs.html
jobs

// jp : https://www.iana.org/domains/root/db/jp.html
// http://jprs.co.jp/en/jpdomain.html
// Submitted by registry <******@****.***>
jp
// jp organizational type names
ac.jp
ad.jp
co.jp
ed.jp
go.jp
gr.jp
lg.jp
ne.jp
or.jp
// jp prefecture type names
aichi.jp
akita.jp
aomori.jp
chiba.jp
ehime.jp