csharp_rsa_encrypt

gistfile1.txt

using System;
using System.Security.Cryptography;
using System.Text;

public class AsymmetricEncryptionExample
{
    public static void Main(string[] args)
    {
        try
        {
            // Generate RSA key pair (public and private keys)
            using (var rsa = new RSACryptoServiceProvider())
            {
                // Get the public and private key
                var publicKey = rsa.ToXmlString(false);
                var privateKey = rsa.ToXmlString(true);

                // Display the keys
                Console.WriteLine("Public Key:");
                Console.WriteLine(publicKey);
                Console.WriteLine();
                Console.WriteLine("Private Key:");
                Console.WriteLine(privateKey);
                Console.WriteLine();

                // Example text to be encrypted
                string originalText = "Hello, world!";

                // Convert the text to bytes
                byte[] byteText = Encoding.UTF8.GetBytes(originalText);

                // Encrypt the text using the public key
                byte[] encryptedBytes;
                using (var rsaEncryptor = new RSACryptoServiceProvider())
                {
                    rsaEncryptor.FromXmlString(publicKey);
                    encryptedBytes = rsaEncryptor.Encrypt(byteText, false);
                }

                // Convert encrypted bytes to base64 for easy display
                string encryptedText = Convert.ToBase64String(encryptedBytes);
                Console.WriteLine("Encrypted Text:");
                Console.WriteLine(encryptedText);
                Console.WriteLine();

                // Decrypt the text using the private key
                byte[] decryptedBytes;
                using (var rsaDecryptor = new RSACryptoServiceProvider())
                {
                    rsaDecryptor.FromXmlString(privateKey);
                    decryptedBytes = rsaDecryptor.Decrypt(encryptedBytes, false);
                }

                // Convert decrypted bytes back to text
                string decryptedText = Encoding.UTF8.GetString(decryptedBytes);
                Console.WriteLine("Decrypted Text:");
                Console.WriteLine(decryptedText);
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("An error occurred: " + ex.Message);
        }
    }
}