Add code for opening vault

Toolkit.Foundation/IKeyDeriver.cs

@@ -1,5 +1,8 @@
 namespace Toolkit.Foundation;
 public interface IKeyDeriver
 {
-    byte[] DeriveKey(string password, byte[] salt, int keySize = 32, int iterations = 10000);
+    byte[] DeriveKey(byte[] phrased,
+        byte[] salt, 
+        int keySize = 32, 
+        int iterations = 10000);
 }

Toolkit.Foundation/KeyDeriver.cs

@@ -5,9 +5,12 @@ namespace Toolkit.Foundation;
 public class KeyDeriver : 
     IKeyDeriver
 {
-    public byte[] DeriveKey(string password, byte[] salt, int keySize = 32, int iterations = 100000)
+    public byte[] DeriveKey(byte[] phrase, 
+        byte[] salt, 
+        int keySize = 32, 
+        int iterations = 100000)
     {
-        using Rfc2898DeriveBytes pbkdf2 = new(password, salt, iterations, HashAlgorithmName.SHA256);
+        using Rfc2898DeriveBytes pbkdf2 = new(phrase, salt, iterations, HashAlgorithmName.SHA256);
         return pbkdf2.GetBytes(keySize);
     }
 }