using System;

using System.Security.Cryptography;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        string privateKeyPem = @"-----BEGIN RSA PRIVATE KEY-----

MIIBOgIBAAJBAKj34GkxFhD90vcNLYLInFEX6Ppy1tPf9Cnzj4p4WGeKLs1Pt8Qu

KUpRKfFLfRYC9AIKjbJTWit+CqvjWYzvQwECAwEAAQJAIJLixBy2qpFoS4DSmoEm

o3qGy0t6z09AIJtH+5OeRV1be+N4cDYJKffGzDa88vQENZiRm0GRq6a+HPGQMd2k

TQIhAKMSvzIBnni7ot/OSie2TmJLY4SwTQAevXysE2RbFDYdAiEBCUEaRQnMnbp7

9mxDXDf6AU0cN/RPBjb9qSHDcWZHGzUCIG2Es59z8ugGrDY+pxLQnwfotadxd+Uy

v/Ow5T0q5gIJAiEAyS4RaI9YG8EWx/2w0T67ZUVAw8eOMB6BIUg0Xcu+3okCIBOs

/5OiPgoTdSy7bcF9IGpSE8ZgGKzgYQVZeN97YE00

-----END RSA PRIVATE KEY-----";

​

        // Decrypt the data

        RSA rsa = RSA.Create();

        rsa.ImportFromPem(privateKeyPem);

        // test

        byte[] ct = rsa.Encrypt(Encoding.UTF8.GetBytes("The quick brown fox jumps over the lazy dog"), RSAEncryptionPadding.Pkcs1); // Extract public key and encrypt with public key

        byte[] dt = rsa.Decrypt(ct, RSAEncryptionPadding.Pkcs1); // Decrypt with private key

        Console.WriteLine(Encoding.UTF8.GetString(dt));

    }

}