AsymmetricKeyPair<PublicKey, PrivateKey> computeRSAKeyPair(
    SecureRandom secureRandom) {
  var rsapars = new RSAKeyGeneratorParameters(BigInt.from(65537), 2048, 12);
  var params = new ParametersWithRandom(rsapars, secureRandom);
  var keyGenerator = new RSAKeyGenerator();
  keyGenerator.init(params);
  return keyGenerator.generateKeyPair();
}

Future<AsymmetricKeyPair<PublicKey, PrivateKey>> getRSAKeyPair(
  SecureRandom secureRandom) async {
  return await compute(computeRSAKeyPair, secureRandom);
}