public string Decrypt(string encryptedString)
{
try
{
var tokenBytes = Convert.FromBase64String(encryptedString);
string decryptedToken;
using (var aes = Aes.Create())
{
aes.Key = _keyBytes;
aes.IV = _ivBytes;
var decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
using (var mStream = new MemoryStream(tokenBytes))
{
using (var decryptoStream = new CryptoStream(mStream, decryptor, CryptoStreamMode.Read))
{
using (var streamReader = new StreamReader(decryptoStream))
{
decryptedToken = streamReader.ReadToEnd();
}
}
}
}
return(decryptedToken);
}
catch (Exception)
{
throw TokenExpiredException.ThrowTokenExpiredException();
}
}
private string[] ParseToken(string tokenString)
{
var splitToken = tokenString.Split('|');
if (splitToken.Length != TokenPartsCount)
{
throw TokenExpiredException.ThrowTokenExpiredException();
}
return(splitToken);
}
private void CheckTokenValidity(DomainToken token)
{
var databaseToken = _iUnitOfWork.TokenRepository.GetByGuid(token.Guid);
if (databaseToken == null || databaseToken.IsExpired)
{
throw TokenExpiredException.ThrowTokenExpiredException();
}
if (DateTime.UtcNow - databaseToken.GenerationDate <= TimeSpan.FromDays(21))
{
return;
}
ExpireToken(token);
throw TokenExpiredException.ThrowTokenExpiredException();
}