chore: added key checking [wip]

* message padding [wip]

main_form.cs

@@ -24,16 +24,9 @@ namespace KRY_0x01_ng
 
 
 
-        public string prune_input(TextBox tb)
-        {
-            string str = tb.Text.ToUpper();
-            string alpha_str = Regex.Replace(str, " ", "MEZERABRO");
-            alpha_str = alpha_str.Replace("[^A-Z]+", "");
-            return alpha_str.Replace("W", "V");
-        }
         public string restore_order(string str)
         {
-            string alpha_str = Regex.Replace(str, "MEZERABRO", " ");
+            string alpha_str = Regex.Replace(str, "SPACEBRO", " ");
             return alpha_str;
         }
 
@@ -73,22 +66,84 @@ namespace KRY_0x01_ng
         }
 
 
-        void check_key()
+        void check_key(TextBox tb_k)
         {
+            if (tb_k.Text.Length == 0)
+            {
+                MessageBox.Show("Empty key.", "Warning");
+                return;
+            }
+            
+            string str_to_check = str_to_check = String.Join("", tb_k.Text.ToUpper().Distinct());
+            if (str_to_check.Length < 9)
+            {
+                MessageBox.Show($"The key is too short ({str_to_check.Length} characters).\nKey requirements: 9-25 unique alphabetic characters", "Error");
+                return;
+            }
+            else if (str_to_check.Length > 25)
+            {
+                MessageBox.Show("The key is too long", "Warning");
+                return;
+            }
+
+            Match match = Regex.Match(str_to_check, @"\d|\s+");
+            if (match.Success)
+            {
+                MessageBox.Show("Only alphabetic characters and spaces are allowed.\nCheck the key for numbers, symbols or tab whitespace and remove them before continuing.", "Error");
+                return;
+            }
+            TextBox tb_pruned_k = textBox2;
+            tb_pruned_k.Text = str_to_check;
             return;
         }
 
         void check_message(TextBox tb_m)
         {
-            string msg = pad(tb_m.Text);
+            if (tb_m.Text.Length == 0)
+            {
+                MessageBox.Show("Empty message, nothing to do.", "Warning");
+                return;
+            }
+            string msg = Regex.Replace(tb_m.Text.ToUpper(), " ", "SPACEBRO");
+            Match match = Regex.Match(msg, @"\d|\s+");
+            if (match.Success)
+            {
+                MessageBox.Show("Only alphabetic characters and spaces are allowed.\nCheck the message for numbers, symbols or tab whitespace and remove them before continuing.\nAlso, \"W\" will be replaced by \"V\".", "Error");
+                return;
+            }
+            msg = msg.Replace("W", "V");
+            textBox5.Text = msg;
+            return;
+        }
+        void prep_message(TextBox tb_m)
+        {
+            string msg = tb_m.Text;
+            if (msg.Length % 2 != 0)
+            {
+                if (! msg.EndsWith("X"))
+                {
+                    msg += "X";
+                }
+                else if (! msg.EndsWith("Q"))
+                {
+                    msg += "Q";
+                }
+                else if (! msg.EndsWith("Z"))
+                {
+                    msg += "Z";
+                }
+            }
+            textBox6.Text = pad(msg);
             return;
         }
 
 
         void encrypt()
         {
+            check_message(textBox4);
+            prep_message(textBox5);
             string cryptmessage = "";
-            string m_text = prune_input(textBox4);
+            textBox7.Text = cryptmessage;
             return;
         }
 
@@ -97,14 +152,13 @@ namespace KRY_0x01_ng
         private void button1_Click(object sender, EventArgs e)
         {
             /* encrypt button */
-            check_message(textBox4);
             encrypt();
         }
 
         private void button2_Click(object sender, EventArgs e)
         {
             /* check key button */
-            check_key();
+            check_key(textBox1);
         }
     }
 }