Simple ISO verification hashing done on the client

download.php

@@ -0,0 +1,49 @@
+<?php
+    require_once __DIR__.'/_backend/preload.php';
+
+    $page['name'] = 'Verify Download';
+    $page['title'] = 'Verify your OS Download';
+
+    include $template['header'];
+?>
+
+<div style='margin: 16rem 8rem;'>
+    <h2>Verify Your OS Download<h2>
+
+    <input type=file />
+    <span id=hash></span>
+</div>
+
+<script type='module'>
+    console.log('ok lets get down to business')
+    const input = document.querySelector('input[type=file]')
+
+    input.addEventListener('change', getFile)
+
+    async function getFile() {
+        const file = this.files[0];
+
+        console.log('got file!')
+        console.log(file)
+        window.file = file;
+        const Reader = new FileReader(file)
+        const buf = await file.arrayBuffer();
+        // const buf = Reader.readAsArrayBuffer(file)
+
+        console.log(buf)
+
+        const hash = await crypto.subtle.digest('SHA-256', buf)
+
+        const uintHash = new Uint8Array(hash);
+
+        // Map the new intHash to Hex to be displayed as a string value
+        const stringifiedHash = Array.from(uintHash).map((b) => b.toString(16).padStart(2, '0')).join('');
+
+        document.querySelector('#hash').innerText = stringifiedHash;
+
+    }
+</script>
+
+<?php 
+    include $template['footer'];
+?>