bunch of fixes

Toolkit.Foundation/KeyGenerator.cs

@@ -0,0 +1,15 @@
+using System.Security.Cryptography;
+
+namespace Toolkit.Foundation;
+
+public class KeyGenerator : 
+    IKeyGenerator
+{
+    public byte[] Generate(int size)
+    {
+        byte[] key = new byte[size];
+        RandomNumberGenerator.Fill(key);
+
+        return key;
+    }
+}