sterilizePublicKey method
returns base64 public key which can be sent to other user for encryption
Implementation
String sterilizePublicKey() {
Base64Encoder encoder = const Base64Encoder();
Map<String, String> x = {};
x['pe'] = e.toString();
x['on'] = on.toString();
return encoder.convert(const Utf8Encoder().convert(jsonEncode(x)));
}