public string Encrypt(byte[] encryptionKey, string cardNumber)
{
var iv = RijndaelHelper.CreateUniqueIv();
using (var h = new RijndaelHelper(encryptionKey, iv))
{
var bytes = h.Encrypt(cardNumber);
return(Convert.ToBase64String(iv) + ":" + Convert.ToBase64String(bytes));
}
}
public string Decrypt(byte[] encryptionKey, string encryptedBlock)
{
var parts = encryptedBlock.Split(new [] { ":" }, StringSplitOptions.None);
var ivbytes = Convert.FromBase64String(parts[0]);
var valuebytes = Convert.FromBase64String(parts[1]);
using (var h = new RijndaelHelper(encryptionKey, ivbytes))
{
return(h.Decrypt(valuebytes));
}
}