bunch of fixes

Toolkit.Foundation/KeyDeriver.cs

@@ -0,0 +1,13 @@
+using System.Security.Cryptography;
+
+namespace Toolkit.Foundation;
+
+public class KeyDeriver : 
+    IKeyDeriver
+{
+    public byte[] DeriveKey(string password, byte[] salt, int keySize = 32, int iterations = 100000)
+    {
+        using Rfc2898DeriveBytes pbkdf2 = new(password, salt, iterations, HashAlgorithmName.SHA256);
+        return pbkdf2.GetBytes(keySize);
+    }
+}