gistfile1.cs

class KeyPair
    {
        internal byte[] PublicKey = new byte[CryptoBox.PublicKeyBytes];
        internal byte[] SecretKey = new byte[CryptoBox.SecretKeyBytes];
    }
 
static void TestAsymmetric()
    {
        // First create the keypairs for both Alice and Bob
        var Alice = new KeyPair();
        var Bob = new KeyPair();
        CryptoBox.ComputeKeyPair(Alice.PublicKey, Alice.SecretKey);
        CryptoBox.ComputeKeyPair(Bob.PublicKey, Bob.SecretKey);
 
        // Then specify the nonce and fill it with random values
        var nonce = new byte[CryptoBox.NonceBytes];
        RandomNumberGenerator rng = RandomNumberGenerator.Create();
        rng.GetBytes(nonce);
 
        // Alice sends a message to Bob
 
        var message = "Hear Me Roar!";
         
        byte[] secretMessage = EncryptAsymmetric(message, Bob.PublicKey, Alice.SecretKey, nonce);
 
        // Bob receives the encrypted message and decrypts it
        string decryptedMessage = DecryptAsymmetric(secretMessage, Alice.PublicKey, Bob.SecretKey, nonce);
        
        //test:
       
        if (decryptedMessage == message)
        {
            Debug.Print("OK! the text matches");
        }
        else
        {
            Debug.Print("ERROR: this should NOT happen, ouch, the decyphered text is wrong!");
        }
 
 
 
    }