private static bool TryDecryptUserId(IKeyFactory keyFactory, out Guid userId, string UserSession, ILogger <UserIdMiddleWare> logger)
{
try
{
using Aes aes = Aes.Create();
aes.Key = keyFactory.Create(_keyname);
aes.IV = keyFactory.Create(_ivname);
ICryptoTransform decryptor = aes.CreateDecryptor();
using MemoryStream ms = new MemoryStream(Convert.FromBase64String(UserSession));
using CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read);
using StreamReader sr = new StreamReader(cs);
string decryptedUserSession = sr.ReadToEnd();
return(Guid.TryParse(decryptedUserSession, out userId));
}
catch (Exception e)
{
logger.LogWarning(e, "Unable to decrypt the user session cookie.");
userId = default;
return(false);
}
}
private static string EncryptUserId(IKeyFactory keyFactory, Guid userId)
{
using Aes aes = Aes.Create();
aes.Key = keyFactory.Create(_keyname);
aes.IV = keyFactory.Create(_ivname);
ICryptoTransform encryptor = aes.CreateEncryptor();
using MemoryStream ms = new MemoryStream();
using CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write);
using StreamWriter sw = new StreamWriter(cs);
sw.Write(userId.ToString());
sw.Flush();
cs.FlushFinalBlock();
return(Convert.ToBase64String(ms.ToArray()));
}
public async Task <Key> FindOrCreateAsync(Guid uuid, KeyType type, CancellationToken cancellationToken)
{
var keyMaybe = await FindAsync(k => k.Uuid == uuid && k.KeyType == type, cancellationToken);
if (keyMaybe.HasValue)
{
return(keyMaybe.Value);
}
var key = _keyFactory.Create(uuid, type);
await AddAsync(key, cancellationToken);
return(key);
}
public void DoWork()
{
var instance = _factory.Create(ProcessKey.A);
instance.Run();
}