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--- built_in:crypt [2017/07/01 00:04]
66.87.142.202 [Password check]
+++ built_in:crypt [2017/07/01 14:27] (current)
@@ Line 13: / Line 13: @@
 The code samples available from the IDE include a Security Encryption sample which demonstrates the use of this control.
-Die
+==== Password check ====
+The following code demonstrates the use of an md5 hash to check a password.
+The first time a password is entered, its hash is saved. Every subsequent time, the password's hash is compared against the saved version.
+If it does not match, the app does not continue.
+<code JavaScript md5.js>
+//Called when application is started.
+function OnStart()
+{
+    var chk = app.LoadText("hash","unset");
+    var pass = prompt("Please enter password","");
+    if (pass==null) app.Exit();
+    var crypt = app.CreateCrypt();
+    var md5 = crypt.Hash( pass, "MD5" );
+    md5 = md5.substr(0,22);
+    if (chk == "unset") app.SaveText("hash", md5)
+    else if(chk != md5)
+    {
+        app.ShowPopup("Incorrect password");
+        app.Exit();
+    }
+    //Create a layout with objects vertically centered.
+    lay = app.CreateLayout( "linear", "VCenter,FillXY" );
+    //Create a text label and add it to layout.
+    txt = app.CreateText( "Welcome" );
+    txt.SetTextSize( 32 );
+    lay.AddChild( txt );
+    //Add layout to app.
+    app.AddLayout( lay );
+}
+</code>

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