diff --git a/delete.html b/delete.html
index 902eba1..a35aea5 100644
--- a/delete.html
+++ b/delete.html
@@ -5,235 +5,66 @@
     <head>
   <meta charset="utf-8">
   <script>
-/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
-/* SHA-256 (FIPS 180-4) implementation in JavaScript                  (c) Chris Veness 2002-2016  */
-/*                                                                                   MIT Licence  */
-/* www.movable-type.co.uk/scripts/sha256.html                                                     */
-/*                                                                                                */
-/*  - see http://csrc.nist.gov/groups/ST/toolkit/secure_hashing.html                              */
-/*        http://csrc.nist.gov/groups/ST/toolkit/examples.html                                    */
-/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
+/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
+/* START SHA256 CODE - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
+/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
+// From https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/digest
+async function sha256(message) {
+    const msgBuffer = new TextEncoder('utf-8').encode(message);                     // encode as UTF-8
+    const hashBuffer = await crypto.subtle.digest('SHA-256', msgBuffer);            // hash the message
+    const hashArray = Array.from(new Uint8Array(hashBuffer));                       // convert ArrayBuffer to Array
+    const hashHex = hashArray.map(b => ('00' + b.toString(16)).slice(-2)).join(''); // convert bytes to hex string
+    return hashHex;
+}
+/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
+/* END SHA256 CODE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
+/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 
-'use strict';
-
-
-/**
- * SHA-256 hash function reference implementation.
- *
- * This is a direct implementation of FIPS 180-4, without any optimisations. It is intended to aid
- * understanding of the algorithm rather than for production use, though it could be used where
- * performance is not critical.
- *
- * @namespace
- */
-var Sha256 = {};
-
-
-/**
- * Generates SHA-256 hash of string.
- *
- * @param   {string} msg - (Unicode) string to be hashed.
- * @param   {Object} [options]
- * @param   {string} [options.msgFormat=string] - Message format: 'string' for JavaScript string
- *   (gets converted to UTF-8 for hashing); 'hex-bytes' for string of hex bytes ('616263' ≡ 'abc') .
- * @param   {string} [options.outFormat=hex] - Output format: 'hex' for string of contiguous
- *   hex bytes; 'hex-w' for grouping hex bytes into groups of (4 byte / 8 character) words.
- * @returns {string} Hash of msg as hex character string.
- */
-Sha256.hash = function(msg, options) {
-    var defaults = { msgFormat: 'string', outFormat: 'hex' };
-    var opt = Object.assign(defaults, options);
-
-    // note use throughout this routine of 'n >>> 0' to coerce Number 'n' to unsigned 32-bit integer
-
-    switch (opt.msgFormat) {
-        default: // default is to convert string to UTF-8, as SHA only deals with byte-streams
-        case 'string':   msg = Sha256.utf8Encode(msg);       break;
-        case 'hex-bytes':msg = Sha256.hexBytesToString(msg); break; // mostly for running tests
-    }
-
-    // constants [§4.2.2]
-    var K = [
-        0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
-        0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
-        0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
-        0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
-        0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
-        0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
-        0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
-        0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 ];
-
-    // initial hash value [§5.3.3]
-    var H = [
-        0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 ];
-
-    // PREPROCESSING [§6.2.1]
-
-    msg += String.fromCharCode(0x80);  // add trailing '1' bit (+ 0's padding) to string [§5.1.1]
-
-    // convert string msg into 512-bit blocks (array of 16 32-bit integers) [§5.2.1]
-    var l = msg.length/4 + 2; // length (in 32-bit integers) of msg + ‘1’ + appended length
-    var N = Math.ceil(l/16);  // number of 16-integer (512-bit) blocks required to hold 'l' ints
-    var M = new Array(N);     // message M is N×16 array of 32-bit integers
-
-    for (var i=0; i<N; i++) {
-        M[i] = new Array(16);
-        for (var j=0; j<16; j++) { // encode 4 chars per integer (64 per block), big-endian encoding
-            M[i][j] = (msg.charCodeAt(i*64+j*4)<<24) | (msg.charCodeAt(i*64+j*4+1)<<16) |
-                      (msg.charCodeAt(i*64+j*4+2)<<8) | (msg.charCodeAt(i*64+j*4+3));
-        } // note running off the end of msg is ok 'cos bitwise ops on NaN return 0
-    }
-    // add length (in bits) into final pair of 32-bit integers (big-endian) [§5.1.1]
-    // note: most significant word would be (len-1)*8 >>> 32, but since JS converts
-    // bitwise-op args to 32 bits, we need to simulate this by arithmetic operators
-    var lenHi = ((msg.length-1)*8) / Math.pow(2, 32);
-    var lenLo = ((msg.length-1)*8) >>> 0;
-    M[N-1][14] = Math.floor(lenHi);
-    M[N-1][15] = lenLo;
-
-
-    // HASH COMPUTATION [§6.2.2]
-
-    for (var i=0; i<N; i++) {
-        var W = new Array(64);
-
-        // 1 - prepare message schedule 'W'
-        for (var t=0;  t<16; t++) W[t] = M[i][t];
-        for (var t=16; t<64; t++) {
-            W[t] = (Sha256.σ1(W[t-2]) + W[t-7] + Sha256.σ0(W[t-15]) + W[t-16]) >>> 0;
-        }
-
-        // 2 - initialise working variables a, b, c, d, e, f, g, h with previous hash value
-        var a = H[0], b = H[1], c = H[2], d = H[3], e = H[4], f = H[5], g = H[6], h = H[7];
-
-        // 3 - main loop (note 'addition modulo 2^32')
-        for (var t=0; t<64; t++) {
-            var T1 = h + Sha256.Σ1(e) + Sha256.Ch(e, f, g) + K[t] + W[t];
-            var T2 =     Sha256.Σ0(a) + Sha256.Maj(a, b, c);
-            h = g;
-            g = f;
-            f = e;
-            e = (d + T1) >>> 0;
-            d = c;
-            c = b;
-            b = a;
-            a = (T1 + T2) >>> 0;
-        }
-
-        // 4 - compute the new intermediate hash value (note '>>> 0' for 'addition modulo 2^32')
-        H[0] = (H[0]+a) >>> 0;
-        H[1] = (H[1]+b) >>> 0;
-        H[2] = (H[2]+c) >>> 0;
-        H[3] = (H[3]+d) >>> 0;
-        H[4] = (H[4]+e) >>> 0;
-        H[5] = (H[5]+f) >>> 0;
-        H[6] = (H[6]+g) >>> 0;
-        H[7] = (H[7]+h) >>> 0;
-    }
-
-    // convert H0..H7 to hex strings (with leading zeros)
-    for (var h=0; h<H.length; h++) H[h] = ('00000000'+H[h].toString(16)).slice(-8);
-
-    // concatenate H0..H7, with separator if required
-    var separator = opt.outFormat=='hex-w' ? ' ' : '';
-
-    return H.join(separator);
-};
-
-
-/**
- * Rotates right (circular right shift) value x by n positions [§3.2.4].
- * @private
- */
-Sha256.ROTR = function(n, x) {
-    return (x >>> n) | (x << (32-n));
-};
-
-/**
- * Logical functions [§4.1.2].
- * @private
- */
-Sha256.Σ0  = function(x) { return Sha256.ROTR(2,  x) ^ Sha256.ROTR(13, x) ^ Sha256.ROTR(22, x); };
-Sha256.Σ1  = function(x) { return Sha256.ROTR(6,  x) ^ Sha256.ROTR(11, x) ^ Sha256.ROTR(25, x); };
-Sha256.σ0  = function(x) { return Sha256.ROTR(7,  x) ^ Sha256.ROTR(18, x) ^ (x>>>3);  };
-Sha256.σ1  = function(x) { return Sha256.ROTR(17, x) ^ Sha256.ROTR(19, x) ^ (x>>>10); };
-Sha256.Ch  = function(x, y, z) { return (x & y) ^ (~x & z); };          // 'choice'
-Sha256.Maj = function(x, y, z) { return (x & y) ^ (x & z) ^ (y & z); }; // 'majority'
-
-
-/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
-
-
-/**
- * Encodes multi-byte string to utf8 - monsur.hossa.in/2012/07/20/utf-8-in-javascript.html
- */
-Sha256.utf8Encode = function(str) {
-    return unescape(encodeURIComponent(str));
-};
-
-
-/**
- * Converts a string of a sequence of hex numbers to a string of characters (eg '616263' => 'abc').
- */
-Sha256.hexBytesToString = function(hexStr) {
-    hexStr = hexStr.replace(' ', ''); // allow space-separated groups
-    var str = '';
-    for (var i=0; i<hexStr.length; i+=2) {
-        str += String.fromCharCode(parseInt(hexStr.slice(i, i+2), 16));
-    }
-    return str;
-};
-
-
-/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
-if (typeof module != 'undefined' && module.exports) module.exports = Sha256; // CommonJs export
-
-/* END SHA256 CODE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
-/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
-
-function sendDeleteRequest() 
+function sendDeleteRequest()
 {
     // Compute 'true' password
     var domain        = document.getElementById("domain").value;
     var user_password = document.getElementById("password").value;
-    var true_password = Sha256.hash(domain+":"+user_password).substring(0,32);
-   
-    // Prepare request
-    var url = "./domains/"+domain
-    var params = "recovery_password="+true_password;
-    var xhttp = new XMLHttpRequest();
+    var true_password;
+    sha256(domain+":"+user_password).then(function(d) {
+        var true_password = d;
 
-    // Prepare handler
-    xhttp.onreadystatechange = function() 
-    {
-        if (xhttp.readyState == 4) 
+        // Prepare request
+        var url = "./domains/"+domain
+        var params = "recovery_password="+true_password;
+        var xhttp = new XMLHttpRequest();
+
+        // Prepare handler
+        xhttp.onreadystatechange = function()
         {
-            if (xhttp.status == 200)
+            if (xhttp.readyState == 4)
             {
-                document.getElementById("debug").innerHTML = xhttp.responseText;
+                if (xhttp.status == 200)
+                {
+                    document.getElementById("debug").innerHTML = xhttp.responseText;
+                }
+                else
+                {
+                    document.getElementById("debug").innerHTML = "Error ? " + xhttp.responseText;
+                }
             }
             else
             {
-                document.getElementById("debug").innerHTML = "Error ? " + xhttp.responseText;
+                document.getElementById("debug").innerHTML = "Sending request...";
             }
-        }
-        else
-        {
-            document.getElementById("debug").innerHTML = "Sending request...";
-        }
-    };
-    
-    // Actually send the request
-    xhttp.open("DELETE", url, true);
-    xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
-    xhttp.send(params);
+        };
+
+        // Actually send the request
+        xhttp.open("DELETE", url, true);
+        xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
+        xhttp.send(params);
+    })
 }
 
 </script>
     </head>
     <body>
         <form>
-            
             Domain to delete:<br>
             <input type="text" id="domain"><br>
             Password:<br>
