diff --git a/Pithos.csproj b/Pithos.csproj
index a48f0c2..3074e21 100644
--- a/Pithos.csproj
+++ b/Pithos.csproj
@@ -51,6 +51,7 @@
       <DependentUpon>mainWindow.cs</DependentUpon>
     </Compile>
     <Compile Include="privateFunctions.cs" />
+    <Compile Include="tools.cs" />
     <Compile Include="unlock.cs">
       <SubType>Form</SubType>
     </Compile>
diff --git a/tools.cs b/tools.cs
new file mode 100644
index 0000000..92f599c
--- /dev/null
+++ b/tools.cs
@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Security.Cryptography;
+namespace Pithos
+{
+    class tools
+    {
+        public static string hash(string input)
+        {
+            // step 1, calculate MD5 hash from input
+            MD5 md5 = MD5.Create();
+            byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(input);
+            byte[] hash = md5.ComputeHash(inputBytes);
+
+            // step 2, convert byte array to hex string
+            StringBuilder sb = new StringBuilder();
+            for (int i = 0; i < hash.Length; i++)
+            {
+                sb.Append(hash[i].ToString("X2"));
+            }
+            return sb.ToString();
+        }
+    }
+}