Dns.DnskeySourceDNS keys
A DNS key record (DNSKEY) specifies flags, algorithm, and key data.
of_string str attempts to parse str to a dnskey. The colon character (:) is used as separator, supported formats are: algo:keydata and flags:algo:keydata, where keydata is a base64 string.
name_key_of_string str attempts to parse str to a domain name and a dnskey. The colon character (:) is used as separator.
pp_name_key (name, key) pretty-prints the dnskey and name pair.