Ufdjrw

I have added pointycastle and generated a keypair, encrypting the trial "Hello World" string. From this, I want to get the values of the Private and Public Key. Is there anywhere they are stored, because whenever I try to print the values of keyPair.privateKey, it returns Instance of 'RSAPrivateKey.

Here is the code I used

 var keyParams = new RSAKeyGeneratorParameters(new BigInt.from(65537), 2048, 5);
 var secureRandom = new FortunaRandom();
 var random = new Random.secure();
 List<int> seeds = [];
 for (int i = 0; i < 32; i++) 
 seeds.add(random.nextInt(255));
 
 secureRandom.seed(new KeyParameter(new Uint8List.fromList(seeds)));

 var rngParams = new ParametersWithRandom(keyParams, secureRandom);
 var k = new RSAKeyGenerator();
 k.init(rngParams);
 var keyPair = k.generateKeyPair();
 var cipher = new RSAEngine()..init( true, new PublicKeyParameter<RSAPublicKey>(keyPair.publicKey));
 print("pubkey: $keyPair.publicKey.toString()");
 var cipherText = cipher.process(new Uint8List.fromList("Hello World".codeUnits));
 print("Encrypted: $new String.fromCharCodes(cipherText)");
 cipher.init( false, new PrivateKeyParameter<RSAPrivateKey>(keyPair.privateKey));
 //cipher.init( false, new PrivateKeyParameter(keyPair.privateKey) )
 var decrypted = cipher.process(cipherText);
 print("Decrypted: $new String.fromCharCodes(decrypted)");

Make sure to import package:pointycastle/asymmetric/api.dart, then use:

 var k = RSAKeyGenerator()..init(rngParams);
 AsymmetricKeyPair<PublicKey, PrivateKey> keyPair = k.generateKeyPair();
 RSAPrivateKey privateKey = keyPair.privateKey;
 RSAPublicKey publicKey = keyPair.publicKey;
 print(privateKey.d); // prints private exponent
 print(publicKey.n); // prints modulus

Recreate from the individual parts:

 RSAPrivateKey foo = RSAPrivateKey(
 privateKey.n,
 privateKey.d,
 privateKey.p,
 privateKey.q,
 );
 RSAPublicKey bar = RSAPublicKey(publicKey.n, publicKey.e);