- fix: auth renew and null fix

Nebula.Shared/Utils/CryptographicStore.cs

@@ -0,0 +1,82 @@
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+using System.Text.Unicode;
+
+namespace Nebula.Shared.Utils;
+
+public static class CryptographicStore
+{
+   public static string Encrypt(object value, byte[] key)
+   {
+      using var memoryStream = new MemoryStream();
+      using var aes = Aes.Create();
+      aes.Key = key;
+
+      var iv = aes.IV;
+      memoryStream.Write(iv, 0, iv.Length);
+      
+      var serializedData = JsonSerializer.Serialize(value);
+
+      using CryptoStream cryptoStream = new(
+         memoryStream,
+         aes.CreateEncryptor(),
+         CryptoStreamMode.Write);
+      
+      using(StreamWriter encryptWriter = new(cryptoStream))
+      {
+         encryptWriter.WriteLine(serializedData);
+      }
+      
+      return Convert.ToBase64String(memoryStream.ToArray());
+   }
+
+   public static async Task<T> Decrypt<T>(string base64EncryptedValue, byte[] key)
+   {
+      using var memoryStream = new MemoryStream(Convert.FromBase64String(base64EncryptedValue));
+      using var aes = Aes.Create();
+      
+      var iv = new byte[aes.IV.Length];
+      var numBytesToRead = aes.IV.Length;
+      var numBytesRead = 0;
+      while (numBytesToRead > 0)
+      {
+         var n = memoryStream.Read(iv, numBytesRead, numBytesToRead);
+         if (n == 0) break;
+
+         numBytesRead += n;
+         numBytesToRead -= n;
+      }
+
+
+      await using CryptoStream cryptoStream = new(
+         memoryStream,
+         aes.CreateDecryptor(key, iv),
+         CryptoStreamMode.Read);
+
+      using StreamReader decryptReader = new(cryptoStream);
+      var decryptedMessage = await decryptReader.ReadToEndAsync();
+      return JsonSerializer.Deserialize<T>(decryptedMessage) ?? throw new InvalidOperationException();
+   }
+
+   public static byte[] GetKey(string input, int keySize = 256)
+   {
+      if (string.IsNullOrEmpty(input))
+         throw new ArgumentException("Input string cannot be null or empty.", nameof(input));
+
+      var salt = Encoding.UTF8.GetBytes(input);
+      
+      using (var deriveBytes = new Rfc2898DeriveBytes(input, salt, 100_000, HashAlgorithmName.SHA256))
+      {
+         return deriveBytes.GetBytes(keySize / 8);
+      }
+   }
+
+   public static byte[] GetComputerKey(int keySize = 256)
+   {
+      var name = Environment.UserName;
+      if (string.IsNullOrEmpty(name))
+         name = "LinuxUser";
+      return GetKey(name, keySize);
+   }
+}