Enigma, cryptage des message en javascript

Dernière mise à jour le par @karamel . 
<html>
<head>
<title>INEGMA</title>
<script language= "JavaScript"> 
<!--
var messagecd=""
function codage(){var message = document.machine.msg.value
                  message=message.toUpperCase()
                  var code = document.machine.codex.value
for(j=0; j<code; j++)
                {messagecd=""
   for(i=0; i<message.length; i++) {
   switch(message.charAt(i)){
    case " " :
        messagecd= messagecd+" ";
        break;
    case "A" :
        messagecd= messagecd+"E";
        break;
    case "B" :
        messagecd= messagecd+"P";
        break;
    case "C" :
        messagecd= messagecd+"S";
        break;
    case "D" :
        messagecd= messagecd+"T";
        break;
    case "E" :
        messagecd= messagecd+"I";
        break;
    case "F" :
        messagecd= messagecd+"W";
        break;
    case "G" :
        messagecd= messagecd+"K";
        break;
    case "H" :
        messagecd= messagecd+"N";
        break;
    case "I" :
        messagecd= messagecd+"U";
        break;
    case "J" :
        messagecd= messagecd+"V";
        break;
    case "K" :
        messagecd= messagecd+"G";
        break;
    case "L" :
        messagecd= messagecd+"C";
        break;
    case "M" :
        messagecd= messagecd+"L";
        break;
    case "N" :
        messagecd= messagecd+"R";
        break;
    case "O" :
        messagecd= messagecd+"Y";
        break;
    case "P" :
        messagecd= messagecd+"B";
        break;
    case "Q" :
        messagecd= messagecd+"X";
        break;
    case "R" :
        messagecd= messagecd+"H";
        break;
    case "S" :
        messagecd= messagecd+"M";
        break;
    case "T" :
        messagecd= messagecd+"D";
        break;
    case "U" :
        messagecd= messagecd+"O";
        break;
    case "V" :
        messagecd= messagecd+"F";
        break;
    case "W" :
        messagecd= messagecd+"Z";
        break;
    case "X" :
        messagecd= messagecd+"Q";
        break;
    case "Y" :
        messagecd= messagecd+"A";
        break;
    case "Z" :
        messagecd= messagecd+"J";
        break;
    default :
            messagecd= messagecd+message.charAt(i);
    }
    }
      message=messagecd
}
==machine.msgcd.value = messagecd==
}
var messagecd=""
function decodage(){
var message = document.machine.msg.value
var messagecd="" 
message=message.toUpperCase()
var code = document.machine.codex.value
for(j=0; j<code; j++)
                {messagecd=""
   for(i=0; i<message.length; i++) {
   switch(message.charAt(i)){
    case " " :
        messagecd= messagecd+" ";
        break;
    case "A" :
        messagecd= messagecd+"Y";
        break;
    case "B" :
        messagecd= messagecd+"P";
        break;
    case "C" :
        messagecd= messagecd+"L";
        break;
    case "D" :
        messagecd= messagecd+"T";
        break;
    case "E" :
        messagecd= messagecd+"A";
        break;
    case "F" :
        messagecd= messagecd+"V";
        break;
    case "G" :
        messagecd= messagecd+"K";
        break;
    case "H" :
        messagecd= messagecd+"R";
        break;
    case "I" :
        messagecd= messagecd+"E";
        break;
    case "J" :
        messagecd= messagecd+"Z";
        break;
    case "K" :
        messagecd= messagecd+"G";
        break;
    case "L" :
        messagecd= messagecd+"M";
        break;
    case "M" :
        messagecd= messagecd+"S";
        break;
    case "N" :
        messagecd= messagecd+"H";
        break;
    case "O" :
        messagecd= messagecd+"U";
        break;
    case "P" :
        messagecd= messagecd+"B";
        break;
    case "Q" :
        messagecd= messagecd+"X";
        break;
    case "R" :
        messagecd= messagecd+"N";
        break;
    case "S" :
        messagecd= messagecd+"C";
        break;
    case "T" :
        messagecd= messagecd+"D";
        break;
    case "U" :
        messagecd= messagecd+"I";
        break;
    case "V" :
        messagecd= messagecd+"J";
        break;
    case "W" :
        messagecd= messagecd+"F";
        break;
    case "X" :
        messagecd= messagecd+"Q";
        break;
    case "Y" :
        messagecd= messagecd+"O";
        break;
    case "Z" :
        messagecd= messagecd+"W";
        break;
    default :
            messagecd= messagecd+message.charAt(i);
   }
   }
   message=messagecd
}
==machine.msgcd.value = messagecd==
}
//--> 
</script>
</head>
<body> 
Machine INEGMA  <sup>version 
    BETA</sup>
<form method ="post" action="" name="machine">
<textarea name="msg" cols="50" wrap="PHYSICAL" rows="3"></textarea>
Code de criptage : 
<textarea name="msgcd" cols="50" rows="3"></textarea> 
</form>
</body>
</html>

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