private void InitializeRSA()
{
RSA publicRSA = publicRSA = RSA.Create();
publicRSA.ImportParameters(publicKey.GetParameters());
securityKey = new RsaSecurityKey(publicRSA);
RSA privateRSA = RSA.Create();
privateRSA.ImportParameters(privateKey.GetParameters());
var securityKeyRSA = new RsaSecurityKey(privateRSA);
signingCredentials = new SigningCredentials(securityKeyRSA, SecurityAlgorithms.RsaSha256);
}