public static string DecryptStringRijndaelFromHexString(string originalHexStringToDecrypt)
{
string DecryptedString;
ASCIIEncoding textConverter = new ASCIIEncoding();
RijndaelManaged oRijndael = new RijndaelManaged();
string Key1 = "carwash";
string Key2 = "andi";
Byte[] toDecrypte;
Byte[] key;
Byte[] IV;
key = GetRijndaelKey(Key1, textConverter);
IV = GetRijndaelIV(Key2, textConverter);
//get decryptor
ICryptoTransform decryptor = oRijndael.CreateDecryptor(key, IV);
try
{
//decrypt data
Byte[] encryted = HexStringHelper.ConvertHexStringToBytes(originalHexStringToDecrypt);
MemoryStream msDecrypt = new MemoryStream(encryted);
CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read);
//covert data to a byte array.
toDecrypte = new Byte[encryted.Length - 1];
//write all data to the crypto stream and flush it.
csDecrypt.Read(toDecrypte, 0, toDecrypte.Length);
int nSigCharLength = -1;
foreach (Byte nByte in toDecrypte)
{
nSigCharLength += 1;
if (nByte == 0)
{
break;
}
}
//redim preserve
toDecrypte = toDecrypte.Take(nSigCharLength).ToArray();
DecryptedString = textConverter.GetString(toDecrypte);
}
catch (CryptographicException ex)
{
throw new ApplicationException(ex.Message, ex);
}
catch (ApplicationException ex)
{
throw new ApplicationException(ex.Message, ex);
}
return(DecryptedString);
}
public static string EncryptStringRijndaelToHexString(string StringToEncrypt)
{
ASCIIEncoding textConverter = new ASCIIEncoding();
RijndaelManaged oRijndael = new RijndaelManaged();
string Key1 = "carwash";
string Key2 = "andi";
Byte[] encrypted;
Byte[] toEncrypt;
Byte[] key;
Byte[] IV;
//get the Key and IV
key = GetRijndaelKey(Key1, textConverter);
IV = GetRijndaelIV(Key2, textConverter);
//get an encryptor
ICryptoTransform encryptor = oRijndael.CreateEncryptor(key, IV);
//encryp data
MemoryStream msEncrypt = new MemoryStream();
CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write);
toEncrypt = textConverter.GetBytes(StringToEncrypt);
//Write all data to the crypto stream and flush it.
csEncrypt.Write(toEncrypt, 0, toEncrypt.Length);
csEncrypt.FlushFinalBlock();
//Get encrypted array of bytes.
encrypted = msEncrypt.ToArray();
StringToEncrypt = HexStringHelper.ConvertBytesToHexString(encrypted);
return(StringToEncrypt);
}
