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()); }