public static int PaddingSizeForMethod(UASecurity.PaddingAlgorithm paddingMethod)
{
switch (paddingMethod)
{
case UASecurity.PaddingAlgorithm.None:
return(0);
case UASecurity.PaddingAlgorithm.PKCS1:
return(11);
case UASecurity.PaddingAlgorithm.PKCS1_OAEP:
return(42);
default:
throw new Exception();
}
}
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);
}
