public static int CalculateEncryptedSize( X509Certificate2 cert, int messageSize, UASecurity.PaddingAlgorithm paddingAlgorithm) { if (!(cert.PublicKey.Key is RSA)) { throw new Exception("Could not create RSA"); } int num1 = UASecurity.PaddingSizeForMethod(paddingAlgorithm); int num2 = UASecurity.CalculatePublicKeyLength(cert) / 8; if (num2 < num1) { throw new Exception(); } int num3 = num2 - num1; return((messageSize + num3 - 1) / num3 * num2); }