This project shows how to use Pointy Castle to generate a RSA Key and encode it to a PKCS1 Pem String.
In order to generate a new RSA Keypair we use RSAKeyGenerator
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();
}
To be able generate the keys in a background thread we use Dart's Isolate implemented in Flutter's compute. We must ensure that the computeRSAKeyPair function is placed outside a Class so that it can be called globally.
Future<AsymmetricKeyPair<PublicKey, PrivateKey>> getRSAKeyPair(
SecureRandom secureRandom) async {
return await compute(computeRSAKeyPair, secureRandom);
}
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