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Using RSACryptoServiceProvider

using System; using System.IO; using System.Security.Cryptography; using System.Collections.Generic; using System.Text;     class Program     {         static void Main(string[] args)         {             string verifiableMesage = "this is a test";             SHA1Managed sha = new SHA1Managed();             byte[] hashValue = sha.ComputeHash(System.Text.ASCIIEncoding.ASCII.GetBytes(verifiableMesage));             StreamReader sr = File.OpenText("Key.xml");             string myKey = sr.ReadToEnd();             RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();             rsa.FromXmlString(myKey);             RSAPKCS1SignatureFormatter sigFormatter = new RSAPKCS1SignatureFormatter(rsa);             sigFormatter.SetHashAlgorithm("SHA1");             byte[] signedHash = sigFormatter.CreateSignature(hashValue);             FileStream fs = new FileStream("signedHash.dat", FileMode.Create);             fs.Write(signedHash, 0, signedHash.Length);             fs.Close();         }     }