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====== Crypt control ======
This control provides methods for encryption and decryption.
===== Methods =====
Some controls use the same methods.\\
For examples of the **[[same methods]]** look here.
^ Method                          ^ Description  ^
| Crypt.Decrypt( text,password )  |              |
| Crypt.Encrypt( text,password )  |              |
| Crypt.GetType()                 |              |
| Crypt.Hash( text,mode )         |              |
| Crypt.Release()                 |              |
===== Sample code =====
The code samples available from the IDE include a Security Encryption sample which demonstrates the use of this control.

==== 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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