deserialize method
Interface for intput serialization.
Implementation
@override
void deserialize(SerializableInput input) {
keytype = deserializeString(input);
if (keytype != 'ssh-ed25519') throw FormatException('$keytype');
pubkey = deserializeStringBytes(input);
if (pubkey.length != 32) throw FormatException('${pubkey.length}');
privkey = deserializeStringBytes(input);
if (privkey.length != 64) throw FormatException('${privkey.length}');
comment = deserializeString(input);
}