public static string DecryptData(string encryptedMessage, string password)
{
if (encryptedMessage.Length % 2 == 1)
{
throw new Exception("The binary key cannot have an odd number of digits");
}
byte[] byteArr = new byte[encryptedMessage.Length / 2];
for (int index = 0; index < byteArr.Length; index++)
{
string byteValue = encryptedMessage.Substring(index * 2, 2);
byteArr[index] = byte.Parse(byteValue, NumberStyles.HexNumber, CultureInfo.InvariantCulture);
}
byte[] result = Rijndael.DecryptData(
byteArr,
Encoding.ASCII.GetBytes(password),
new byte[] { }, // Initialization vector
Rijndael.BlockSize.Block256, // Typically 128 in most implementations
Rijndael.KeySize.Key256,
Rijndael.EncryptionMode.ModeECB // Rijndael.EncryptionMode.ModeCBC
);
return(ASCIIEncoding.ASCII.GetString(result));
}