public void SignRequest(ref HttpWebRequest Request)
{
TimeSpan diff = DateTime.UtcNow - (new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc));
uint timestamp = (uint)Math.Floor(diff.TotalSeconds); // Seconds since 1970
string data = timestamp.ToString();
Chilkat.PrivateKey privkey1 = new Chilkat.PrivateKey();
privkey1.LoadPem(mykey);
Chilkat.Rsa rsa1 = new Chilkat.Rsa();
bool success = rsa1.UnlockComponent("HAFSJORSA_K36nxU3n1Yui");
success = rsa1.ImportPrivateKey(privkey1.GetXml());
rsa1.EncodingMode = "base64";
rsa1.Charset = "ANSI";
rsa1.LittleEndian = false;
rsa1.OaepPadding = false;
string s_mysecre = data + mysecret;
char[] c_mysecre = s_mysecre.ToCharArray();
byte[] b_mysecre = System.Text.Encoding.GetEncoding("windows-1252").GetBytes(c_mysecre);
string hexSig = rsa1.SignBytesENC(b_mysecre, "sha-1");
Request.Headers.Add("timestamp", data);
Request.Headers.Add("signed", hexSig);
}