/// <summary>
/// Decrypts the ticket
/// </summary>
/// <param name="cookieString"></param>
/// <returns></returns>
public FormsAuthenticationTicket DecryptCookie(string cookieString)
{
byte[] cookieBlob = null;
// 1. Convert from hex to binary.
if ((cookieString.Length % 2) == 0)
{ // Could be a hex string
try
{
cookieBlob = HexUtils.HexToBinary(cookieString);
}
catch { }
}
if (cookieBlob == null)
{
return(null);
}
// decrypt
byte[] decryptedCookie = Decrypt(cookieBlob, _hasher, true);
int ticketLength = decryptedCookie.Length;
if (_CompatibilityMode == CompatibilityMode.Framework20SP2)
{
ticketLength = decryptedCookie.Length - _hasher.HashSize;
bool validHash = _hasher.CheckHash(decryptedCookie, ticketLength);
if (!validHash)
{
throw new Exception("Invalid Hash");
}
}
return(FormsAuthenticationTicketHelper.Deserialize(decryptedCookie, ticketLength));
}
public FormsAuthenticationTicketEncryptor(
string decryptionKey,
string validationKey,
DecryptionKeyAlgorithm decryptionKeyAlgorithm,
ValidationKeyAlgorithm validationKeyAlgorithm,
CompatibilityMode compatibilityMode)
{
byte[] descriptionKeyBytes = HexUtils.HexToBinary(decryptionKey);
byte[] validationKeyBytes = HexUtils.HexToBinary(validationKey);
Initialize(descriptionKeyBytes, validationKeyBytes, decryptionKeyAlgorithm, validationKeyAlgorithm, compatibilityMode);
}
