avsmithy · September 28, 2022 20:42 · Sep 20, 2022 · Sep 20, 2022 · Sep 19, 2022 · Sep 19, 2022
diff --git a/paxton-covert.html b/paxton-covert.html
@@ -24,7 +24,7 @@ <h1>Paxton Fob Conversion</h1>
     This page can be used to convert the data on a paxton fob to a 8 byte id suitable for emulating as a EM41X id and vice versa. It was written by natmchugh https://github.com/natmchugh. It uses only client side JavaScript and so you can use the page here or save it and run it locally, enjoy!
   </p>
   <p>
-    The source code for this page can be found at [https://gist.github.com/natmchugh/e8f08350a606dc68bbffbc0f6c44017b/raw/paxton-covert.html](https://gist.github.com/natmchugh/e8f08350a606dc68bbffbc0f6c44017b/raw/paxton-covert.html)
+    The source code for this page can be found at https://gist.github.com/natmchugh/e8f08350a606dc68bbffbc0f6c44017b/raw/paxton-covert.html
   </p>
   <div>
     <h2>Convert page 4 and 5 of data from a paxton tag to an ID</h2>

diff --git a/paxton-covert.html b/paxton-covert.html
@@ -23,7 +23,9 @@ <h1>Paxton Fob Conversion</h1>
   <p>
     This page can be used to convert the data on a paxton fob to a 8 byte id suitable for emulating as a EM41X id and vice versa. It was written by natmchugh https://github.com/natmchugh. It uses only client side JavaScript and so you can use the page here or save it and run it locally, enjoy!
   </p>
-
+  <p>
+    The source code for this page can be found at [https://gist.github.com/natmchugh/e8f08350a606dc68bbffbc0f6c44017b/raw/paxton-covert.html](https://gist.github.com/natmchugh/e8f08350a606dc68bbffbc0f6c44017b/raw/paxton-covert.html)
+  </p>
   <div>
     <h2>Convert page 4 and 5 of data from a paxton tag to an ID</h2>
     <form onsubmit="convertToEm41x()">

diff --git a/paxton-covert.html b/paxton-covert.html
@@ -69,7 +69,7 @@ <h2>Convert from an ID to the equivalent data on page 4 and 5 of a paxton fob</h
 </body>
 </html>
 
-<script src="/convert.js">
+<script>
   function convertToEm41x() {
   const page4 = document.getElementById('page4').value.replace(/ /g,'');
   const page5 = document.getElementById('page5').value.replace(/ /g,'');
@@ -103,8 +103,8 @@ <h2>Convert from an ID to the equivalent data on page 4 and 5 of a paxton fob</h
 
 function convertPaxton() {
   event.preventDefault();
-  const em41x = document.getElementById('id').value.replace(/ /g,'');
-  const type = document.getElementById('type').value.replace(/ /g,'');
+  const em41x = document.getElementById('id').value.replace(/ /g,'').padStart(8, 0);
+  const type = document.getElementById('type').value;
   let result = 0n;
   em41x.split('').forEach(
     (digit, index) => {

diff --git a/paxton-covert.html b/paxton-covert.html
@@ -21,11 +21,11 @@
   <h1>Paxton Fob Conversion</h1>
 
   <p>
-    This page can be used to convert the data on a paxton fob to a 8 byte id suitable for emulating as a EM41X id and vice versa. It was written by natmchugh https://github.com/natmchugh. It uses only client side JavaScript and you are welcome to save the page and run it locally.
+    This page can be used to convert the data on a paxton fob to a 8 byte id suitable for emulating as a EM41X id and vice versa. It was written by natmchugh https://github.com/natmchugh. It uses only client side JavaScript and so you can use the page here or save it and run it locally, enjoy!
   </p>
 
   <div>
-    <h2>Convert page 4 and 5 of data from a paxrton tag to an ID</h2>
+    <h2>Convert page 4 and 5 of data from a paxton tag to an ID</h2>
     <form onsubmit="convertToEm41x()">
         <label for="page4">Page 4:</label><br>
         <input id="page4"><br>
@@ -45,7 +45,7 @@ <h2>Convert page 4 and 5 of data from a paxrton tag to an ID</h2>
   </div>
 
   <div>
-  <h2>Convert from an ID to the equivalent data on page 4 and 5 of paxton fob</h2>
+  <h2>Convert from an ID to the equivalent data on page 4 and 5 of a paxton fob</h2>
   <form onsubmit="convertPaxton()">
       <label for="id">Id:</label><br>
       <input id="id"><br>

diff --git a/html → paxton-covert.html b/html → paxton-covert.html
diff --git a/html b/html
@@ -0,0 +1,124 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width">
+  <title>Paxton Fob converter</title>
+<style>
+table, th, td, div {
+  border: 1px solid black;
+}
+td {
+  min-width: 100px;
+}
+input, select,div, form, table  {
+  margin:  5px;
+  padding:  5px;
+}
+</style>
+</head>
+<body>
+  <h1>Paxton Fob Conversion</h1>
+
+  <p>
+    This page can be used to convert the data on a paxton fob to a 8 byte id suitable for emulating as a EM41X id and vice versa. It was written by natmchugh https://github.com/natmchugh. It uses only client side JavaScript and you are welcome to save the page and run it locally.
+  </p>
+
+  <div>
+    <h2>Convert page 4 and 5 of data from a paxrton tag to an ID</h2>
+    <form onsubmit="convertToEm41x()">
+        <label for="page4">Page 4:</label><br>
+        <input id="page4"><br>
+        <label for="page5">Page 5:</label><br>
+        <input id="page5"><br>
+      <input type="submit" value="Convert"><br>
+    </form>
+      <table style="border:1px solid black">
+      <tr>
+        <td>Decimal</td><td id="em41x_dec"></td>
+      </tr>
+      <tr>
+        <td>Hex</td><td id="em41x_hex"></td>
+      </tr>
+    </table>
+    <br/>
+  </div>
+
+  <div>
+  <h2>Convert from an ID to the equivalent data on page 4 and 5 of paxton fob</h2>
+  <form onsubmit="convertPaxton()">
+      <label for="id">Id:</label><br>
+      <input id="id"><br>
+      <label for="type">Type:</label><br>
+      <select id="type">
+          <option value="6">iso card</option>
+          <option value="3">fob</option>
+          <option value="2">iso magstripe</option>
+      </select><br>
+    <input type="submit" value="Convert">
+  </form>
+    <table style="border:1px solid black">
+    <tr>
+      <td>Page 4</td><td id="page4_result"></td>
+    </tr>
+    <tr>
+      <td>Page 5</td><td id="page5_result"></td>
+    </tr>
+  </table>
+  </div>
+</body>
+</html>
+
+<script src="/convert.js">
+  function convertToEm41x() {
+  const page4 = document.getElementById('page4').value.replace(/ /g,'');
+  const page5 = document.getElementById('page5').value.replace(/ /g,'');
+  let  hex = BigInt('0x'+page4+page5);
+  let num = i = 0n;
+  let output = 0n;
+  let skip = 64n;
+  let digit = '';
+  let mask = BigInt('0xF800000000000000');
+  while (i < 8n) {
+    num = hex & mask;
+    skip -= 5n;
+    mask = mask >> 5n;
+    digit = (num >> skip & 15n);
+    output = (output * 10n ) + digit;
+    if (i === 5n)
+    {
+       skip -= 2n;
+       mask = mask >> 2n;
+    }
+    i++;
+}
+  document.getElementById('em41x_dec').innerHTML = (output.toString(10));
+  document.getElementById('em41x_hex').innerHTML = (output.toString(16));
+  event.preventDefault();
+}
+function getParity(n)
+{
+  return ~(((BigInt(n) * BigInt("0x0101010101010101")) & BigInt("0x8040201008040201")) % BigInt("0x1FF")) & 1n;
+}
+
+function convertPaxton() {
+  event.preventDefault();
+  const em41x = document.getElementById('id').value.replace(/ /g,'');
+  const type = document.getElementById('type').value.replace(/ /g,'');
+  let result = 0n;
+  em41x.split('').forEach(
+    (digit, index) => {
+      dec = BigInt(digit)
+      dec = (getParity(dec) << 4n) + dec;
+      result = (result << 5n) + BigInt(dec);
+      if (index == 5) { result = result << 2n; }
+    }
+  );
+  result = (result << 22n) + 4128768n + BigInt(type);
+
+  document.getElementById('page4_result').innerHTML = result.toString(16).substr(0, 8);
+  document.getElementById('page5_result').innerHTML = result.toString(16).substr(8, 16);
+  event.preventDefault();
+}
+
+</script>
No results found