public static byte[] smethod_0(this RSACryptoServiceProvider rsacryptoServiceProvider_0, byte[] byte_0)
{
if (byte_0 == null)
{
throw new ArgumentNullException("data");
}
if (rsacryptoServiceProvider_0.PublicOnly)
{
throw new InvalidOperationException("Private key is not loaded");
}
int num = rsacryptoServiceProvider_0.KeySize / 8 - 6;
if (byte_0.Length > num)
{
throw new ArgumentOutOfRangeException("data", string.Format("Maximum data length for the current key size ({0} bits) is {1} bytes (current length: {2} bytes)", rsacryptoServiceProvider_0.KeySize, num, byte_0.Length));
}
BigInteger value = GClass881.smethod_2(GClass881.smethod_3(byte_0));
RSAParameters rsaparameters = rsacryptoServiceProvider_0.ExportParameters(true);
BigInteger exponent = GClass881.smethod_2(rsaparameters.D);
BigInteger modulus = GClass881.smethod_2(rsaparameters.Modulus);
return(BigInteger.ModPow(value, exponent, modulus).ToByteArray());
}