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<!DOCTYPE HTML>
<title>Password Hasher</title>
<meta charset='utf-8'>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
:root {
--bg: white;
--fg: black;
--accent-bg: #eee;
--button-bg: #ddd;
--input-bg: white;
}
@media (prefers-color-scheme: dark) {
:root {
--bg: black;
--fg: #ccc;
--accent-bg: #111;
--button-bg: #222;
--input-bg: #222;
}
}
body {
font-family: sans-serif;
font-size: 18px;
display: flex;
flex-flow: column;
align-items: stretch;
background: var(--bg);
color: var(--fg);
color-scheme: light dark;
width: 240px;
margin: 0 auto;
gap: .5em;
}
#hash-word {
font-family: monospace;
}
input[type=text], input[type=password], input:not([type]) {
width: 100%;
}
fieldset {
border: none;
background: var(--accent-bg);
margin-top: .5em;
border-radius: 5px;
display: flex;
flex-flow: column;
gap: .5em;
align-items: center;
}
legend {
background: var(--accent-bg);
padding: 1px 5px;
border-radius: 3px;
}
fieldset .buttons {
display: flex;
gap: 1em;
align-self: stretch;
}
fieldset .buttons > button {
flex: 1 auto;
font-size: 16px;
}
fieldset > ul {
margin: 0;
padding: 0;
list-style: none;
}
fieldset.size > ul {
columns: 2;
}
@supports not (color-scheme: dark) {
input {
background: var(--input-bg);
color: var(--fg);
border-color: var(--accent-bg);
}
button {
background: var(--button-bg);
color: var(--fg);
border-color: var(--accent-bg);
}
}
body > details[open] {
align-self: center;
width: 500px;
max-width: 100vw;
}
</style>
<form>
<fieldset title="A non-secure, easy-to-remember 'name' for this password">
<legend>Password Name</legend>
<input type=text id="site-tag" autofocus>
</fieldset>
<fieldset title="A secure, hard-to-guess master password you use for everything.">
<legend>Master Key</legend>
<input id="master-key" type="password">
</fieldset>
<fieldset title="Generates the same every time you use the same Password Name and Master Key.">
<legend>Generated Password</legend>
<div class='buttons'>
<button type=button onclick='generatePassword(12)' title="12 characters">Short</button>
<button type=button onclick='generatePassword(26)' title="26 characters">Long</button>
</div>
<input type=text id="hash-word">
</fieldset>
<details>
<summary>More Options</summary>
<p><button type=button onclick='generatePassword(8)'>Unsafe 8 Character</button></p>
<p><button type=button onclick='generateCustomPassword()'>Generate Custom</button></p>
<fieldset>
<legend>Requirements</legend>
<ul>
<li><label><input type="checkbox" id="digit" checked> Digits</label></li>
<li><label><input type="checkbox" id="punctuation" checked> Punctuation</label></li>
<li><label><input type="checkbox" id="mixedCase" checked> Mixed Case</label></li>
</ul>
</fieldset>
<fieldset>
<legend>Restrictions</legend>
<ul>
<li><label><input type="checkbox" id="noSpecial"> No Special</label></li>
<li><label><input type="checkbox" id="digitsOnly"> Digits Only</label></li>
</ul>
</fieldset>
<fieldset class='size'>
<legend>Size</legend>
<ul>
<li><label><input type=radio name=size value=4> 4</label></li>
<li><label><input type=radio name=size value=6> 6</label></li>
<li><label><input type=radio name=size value=8> 8</label></li>
<li><label><input type=radio name=size value=10> 10</label></li>
<li><label><input type=radio name=size value=12 checked> 12</label></li>
<li><label><input type=radio name=size value=14> 14</label></li>
<li><label><input type=radio name=size value=16> 16</label></li>
<li><label><input type=radio name=size value=18> 18</label></li>
<li><label><input type=radio name=size value=20> 20</label></li>
<li><label><input type=radio name=size value=22> 22</label></li>
<li><label><input type=radio name=size value=24> 24</label></li>
<li><label><input type=radio name=size value=26> 26</label></li>
</ul>
</fieldset>
</details>
</form>
<details>
<summary>How do I use this?</summary>
<p>
This is a secure password generator that doesn't store any information whatsoever.
Using this site, you don't need to use a "password locker"
or anything else that might lose your passwords.
You can save it to your own computer so you have access to it even if my website disappears;
it's a single-page, totally self-contained app,
with the only external file being a small script to make it available when you're offline.
<p>
To use, first come up with a secure "Master Password".
This can be anything you want, but it needs to be a <em>really good</em> password:
random letters and numbers, decent length, the whole jazz.
Write this down somewhere secure until you memorize it;
if you forget this, you won't be able to access any of your passwords.
You'll use this Master Password for <em>all</em> your passwords;
it's the only secure password you'll ever have to remember again.
<p>
Then, whenever you need a new password for something,
come up with a "Password Name" for it.
This should <em>not</em> be secure and random;
it should instead be easy to remember later.
For example, if I need to make a password for my Google account,
I can just use "google" as the Password Name.
<p>
Then hit "Short" if you want a 12-character password,
or "Long" if you want a 26-character password.
<em>Most</em> websites will accept a 26-character password,
and it's vastly more secure,
so use that whenever you can;
the 12-character option is for the occasional badly-written site
with maximum password lengths.
<p>
Every time you use the same Password Name and Master Password,
it'll generate the exact same password,
so you don't need to write down what it generates.
Just memorize your Master Password
and keep your Password Names easy to remember
(and write them down somewhere, too!)
and you can get your passwords from anywhere.
<p>
If the Short and Long buttons don't work
(some sites are <em>really</em> badly designed
and have asinine requirements on what your password must contain),
click "More Options" and select exactly what you need:
whether the password requires digits, punctuation, or uppercase letters;
whether it needs to have <em>no</em> punctuation or be only digits (for a PIN number);
and what length you want.
Then click "Generate Custom" to get your custom password.
<p>
I recommend saving your Password Names somewhere you can easily access them,
in case you forget.
These do <em>not</em> need to be secure,
so feel free to use a notebook,
or a Google Doc,
or anything else like that.
This will also let you record if a site had special requirements for their password
that required you to use Short or custom options,
since you need to set the exact same options every time.
</details>
<script>
function findAll(sel) { return [].slice.call(document.querySelectorAll(sel)); }
function find(sel) { return document.querySelector(sel); }
function validate(form) {
return find('#site-tag').value.trim() && find('#master-key').value.trim();
}
function generatePassword(len) {
const hashword = find('#hash-word');
const pw = PassHashCommon.generateHashWord(
find('#site-tag').value.trim(),
find('#master-key').value.trim(),
len,true,false,true,true,false
);
hashword.value = pw;
hashword.select();
hashword.focus();
if (navigator.clipboard) {
navigator.clipboard.writeText(pw);
} else {
console.warn('Cannot copy to clipboard');
}
}
function update() {
var noSpecial = find("#noSpecial").checked;
var digitsOnly = find("#digitsOnly").checked;
find('#punctuation').disabled = noSpecial || digitsOnly;
find("#digit" ).disabled = digitsOnly;
find("#mixedCase" ).disabled = digitsOnly;
find("#noSpecial" ).disabled = digitsOnly;
}
function generateCustomPassword() {
const siteTag = find('#site-tag');
const masterKey = find('#master-key');
const hashWord = find('#hash-word');
const submit = find('#submit');
const requireDigit = find("#digit").checked;
const requirePunctuation = find("#punctuation").checked;
const requireMixedCase = find("#mixedCase").checked;
const restrictSpecial = find("#noSpecial").checked;
const restrictDigits = find("#digitsOnly").checked;
const hashWordSize = Number(find("input[name='size']:checked").value);
const pw = PassHashCommon.generateHashWord(
siteTag.value.trim(),
masterKey.value.trim(),
hashWordSize,
requireDigit,
requirePunctuation,
requireMixedCase,
restrictSpecial,
restrictDigits);
hashWord.value = pw;
hashWord.select();
hashWord.focus();
if (navigator.clipboard) {
navigator.clipboard.writeText(pw);
} else {
console.warn('Cannot copy to clipboard');
}
}
window.onload = function() {
findAll("input[type='radio'], input[type='checkbox']").forEach(function(el){
el.onclick = update;
});
};
window.addEventListener("load", () => {
if ("serviceWorker" in navigator) {
navigator.serviceWorker.register("sw.js");
}
});
</script>
<script>
/*
* A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined
* in FIPS PUB 180-1
* Version 2.1a Copyright Paul Johnston 2000 - 2002.
* Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
* Distributed under the BSD License
* See http://pajhome.org.uk/crypt/md5 for details.
*/
/*
* Configurable variables. You may need to tweak these to be compatible with
* the server-side, but the defaults work in most cases.
*/
var hexcase = 0; /* hex output format. 0 - lowercase; 1 - uppercase */
var b64pad = ""; /* base-64 pad character. "=" for strict RFC compliance */
var chrsz = 8; /* bits per input character. 8 - ASCII; 16 - Unicode */
/*
* These are the functions you'll usually want to call
* They take string arguments and return either hex or base-64 encoded strings
*/
function hex_sha1(s){return binb2hex(core_sha1(str2binb(s),s.length * chrsz));}
function b64_sha1(s){return binb2b64(core_sha1(str2binb(s),s.length * chrsz));}
function str_sha1(s){return binb2str(core_sha1(str2binb(s),s.length * chrsz));}
function hex_hmac_sha1(key, data){ return binb2hex(core_hmac_sha1(key, data));}
function b64_hmac_sha1(key, data){ return binb2b64(core_hmac_sha1(key, data));}
function str_hmac_sha1(key, data){ return binb2str(core_hmac_sha1(key, data));}
/*
* Perform a simple self-test to see if the VM is working
*/
function sha1_vm_test()
{
return hex_sha1("abc") == "a9993e364706816aba3e25717850c26c9cd0d89d";
}
/*
* Calculate the SHA-1 of an array of big-endian words, and a bit length
*/
function core_sha1(x, len)
{
/* append padding */
/* SC - Get rid of warning */
var i = (len >> 5);
if (x[i] == undefined)
x[i] = 0x80 << (24 - len % 32);
else
x[i] |= 0x80 << (24 - len % 32);
/*x[len >> 5] |= 0x80 << (24 - len % 32);*/
x[((len + 64 >> 9) << 4) + 15] = len;
var w = Array(80);
var a = 1732584193;
var b = -271733879;
var c = -1732584194;
var d = 271733878;
var e = -1009589776;
for(var i = 0; i < x.length; i += 16)
{
var olda = a;
var oldb = b;
var oldc = c;
var oldd = d;
var olde = e;
for(var j = 0; j < 80; j++)
{
if(j < 16) w[j] = x[i + j];
else w[j] = rol(w[j-3] ^ w[j-8] ^ w[j-14] ^ w[j-16], 1);
var t = safe_add(safe_add(rol(a, 5), sha1_ft(j, b, c, d)),
safe_add(safe_add(e, w[j]), sha1_kt(j)));
e = d;
d = c;
c = rol(b, 30);
b = a;
a = t;
}
a = safe_add(a, olda);
b = safe_add(b, oldb);
c = safe_add(c, oldc);
d = safe_add(d, oldd);
e = safe_add(e, olde);
}
return Array(a, b, c, d, e);
}
/*
* Perform the appropriate triplet combination function for the current
* iteration
*/
function sha1_ft(t, b, c, d)
{
if(t < 20) return (b & c) | ((~b) & d);
if(t < 40) return b ^ c ^ d;
if(t < 60) return (b & c) | (b & d) | (c & d);
return b ^ c ^ d;
}
/*
* Determine the appropriate additive constant for the current iteration
*/
function sha1_kt(t)
{
return (t < 20) ? 1518500249 : (t < 40) ? 1859775393 :
(t < 60) ? -1894007588 : -899497514;
}
/*
* Calculate the HMAC-SHA1 of a key and some data
*/
function core_hmac_sha1(key, data)
{
var bkey = str2binb(key);
if(bkey.length > 16) bkey = core_sha1(bkey, key.length * chrsz);
var ipad = Array(16), opad = Array(16);
for(var i = 0; i < 16; i++)
{
/* SC - Get rid of warning */
var k = (bkey[i] != undefined ? bkey[i] : 0);
ipad[i] = k ^ 0x36363636;
opad[i] = k ^ 0x5C5C5C5C;
/* ipad[i] = bkey[i] ^ 0x36363636;
opad[i] = bkey[i] ^ 0x5C5C5C5C;*/
}
var hash = core_sha1(ipad.concat(str2binb(data)), 512 + data.length * chrsz);
return core_sha1(opad.concat(hash), 512 + 160);
}
/*
* Add integers, wrapping at 2^32. This uses 16-bit operations internally
* to work around bugs in some JS interpreters.
*/
function safe_add(x, y)
{
var lsw = (x & 0xFFFF) + (y & 0xFFFF);
var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xFFFF);
}
/*
* Bitwise rotate a 32-bit number to the left.
*/
function rol(num, cnt)
{
return (num << cnt) | (num >>> (32 - cnt));
}
/*
* Convert an 8-bit or 16-bit string to an array of big-endian words
* In 8-bit function, characters >255 have their hi-byte silently ignored.
*/
function str2binb(str)
{
var bin = Array();
var mask = (1 << chrsz) - 1;
/* SC - Get rid of warnings */
for(var i = 0; i < str.length * chrsz; i += chrsz)
{
if (bin[i>>5] != undefined)
bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (32 - chrsz - i%32);
else
bin[i>>5] = (str.charCodeAt(i / chrsz) & mask) << (32 - chrsz - i%32);
}
/*for(var i = 0; i < str.length * chrsz; i += chrsz)
bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (32 - chrsz - i%32);*/
return bin;
}
/*
* Convert an array of big-endian words to a string
*/
function binb2str(bin)
{
var str = "";
var mask = (1 << chrsz) - 1;
for(var i = 0; i < bin.length * 32; i += chrsz)
str += String.fromCharCode((bin[i>>5] >>> (32 - chrsz - i%32)) & mask);
return str;
}
/*
* Convert an array of big-endian words to a hex string.
*/
function binb2hex(binarray)
{
var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
var str = "";
for(var i = 0; i < binarray.length * 4; i++)
{
str += hex_tab.charAt((binarray[i>>2] >> ((3 - i%4)*8+4)) & 0xF) +
hex_tab.charAt((binarray[i>>2] >> ((3 - i%4)*8 )) & 0xF);
}
return str;
}
/*
* Convert an array of big-endian words to a base-64 string
*/
function binb2b64(binarray)
{
var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var str = "";
for(var i = 0; i < binarray.length * 4; i += 3)
{
/* SC - Get rid of warning */
var b1 = binarray[i >> 2] != undefined ? ((binarray[i >> 2] >> 8 * (3 - i %4)) & 0xFF) << 16 : 0;
var b2 = binarray[i+1 >> 2] != undefined ? ((binarray[i+1 >> 2] >> 8 * (3 - (i+1)%4)) & 0xFF) << 8 : 0;
var b3 = binarray[i+2 >> 2] != undefined ? ((binarray[i+2 >> 2] >> 8 * (3 - (i+2)%4)) & 0xFF) : 0;
var triplet = b1 | b2 | b3;
/*var triplet = (((binarray[i >> 2] >> 8 * (3 - i %4)) & 0xFF) << 16)
| (((binarray[i+1 >> 2] >> 8 * (3 - (i+1)%4)) & 0xFF) << 8 )
| ((binarray[i+2 >> 2] >> 8 * (3 - (i+2)%4)) & 0xFF);*/
for(var j = 0; j < 4; j++)
{
if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;
else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
}
}
return str;
}
</script>
<script>
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Password Hasher
*
* The Initial Developer of the Original Code is Steve Cooper.
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s): (none)
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
var PassHashCommon =
{
// IMPORTANT: This function should be changed carefully. It must be
// completely deterministic and consistent between releases. Otherwise
// users would be forced to update their passwords. In other words, the
// algorithm must always be backward-compatible. It's only acceptable to
// violate backward compatibility when new options are used.
// SECURITY: The optional adjustments are positioned and calculated based
// on the sum of all character codes in the raw hash string. So it becomes
// far more difficult to guess the injected special characters without
// knowing the master key.
// TODO: Is it ok to assume ASCII is ok for adjustments?
generateHashWord: function(
siteTag,
masterKey,
hashWordSize,
requireDigit,
requirePunctuation,
requireMixedCase,
restrictSpecial,
restrictDigits)
{
// Start with the SHA1-encrypted master key/site tag.
var s = b64_hmac_sha1(masterKey, siteTag);
// Use the checksum of all characters as a pseudo-randomizing seed to
// avoid making the injected characters easy to guess. Note that it
// isn't random in the sense of not being deterministic (i.e.
// repeatable). Must share the same seed between all injected
// characters so that they are guaranteed unique positions based on
// their offsets.
var sum = 0;
for (var i = 0; i < s.length; i++)
sum += s.charCodeAt(i);
// Restrict digits just does a mod 10 of all the characters
if (restrictDigits)
s = PassHashCommon.convertToDigits(s, sum, hashWordSize);
else
{
// Inject digit, punctuation, and mixed case as needed.
if (requireDigit)
s = PassHashCommon.injectSpecialCharacter(s, 0, 4, sum, hashWordSize, 48, 10);
if (requirePunctuation && !restrictSpecial)
s = PassHashCommon.injectSpecialCharacter(s, 1, 4, sum, hashWordSize, 33, 15);
if (requireMixedCase)
{
s = PassHashCommon.injectSpecialCharacter(s, 2, 4, sum, hashWordSize, 65, 26);
s = PassHashCommon.injectSpecialCharacter(s, 3, 4, sum, hashWordSize, 97, 26);
}
// Strip out special characters as needed.
if (restrictSpecial)
s = PassHashCommon.removeSpecialCharacters(s, sum, hashWordSize);
}
// Trim it to size.
return s.substr(0, hashWordSize);
},
// This is a very specialized method to inject a character chosen from a
// range of character codes into a block at the front of a string if one of
// those characters is not already present.
// Parameters:
// sInput = input string
// offset = offset for position of injected character
// reserved = # of offsets reserved for special characters
// seed = seed for pseudo-randomizing the position and injected character
// lenOut = length of head of string that will eventually survive truncation.
// cStart = character code for first valid injected character.
// cNum = number of valid character codes starting from cStart.
injectSpecialCharacter: function(sInput, offset, reserved, seed, lenOut, cStart, cNum)
{
var pos0 = seed % lenOut;
var pos = (pos0 + offset) % lenOut;
// Check if a qualified character is already present
// Write the loop so that the reserved block is ignored.
for (var i = 0; i < lenOut - reserved; i++)
{
var i2 = (pos0 + reserved + i) % lenOut
var c = sInput.charCodeAt(i2);
if (c >= cStart && c < cStart + cNum)
return sInput; // Already present - nothing to do
}
var sHead = (pos > 0 ? sInput.substring(0, pos) : "");
var sInject = String.fromCharCode(((seed + sInput.charCodeAt(pos)) % cNum) + cStart);
var sTail = (pos + 1 < sInput.length ? sInput.substring(pos+1, sInput.length) : "");
return (sHead + sInject + sTail);
},
// Another specialized method to replace a class of character, e.g.
// punctuation, with plain letters and numbers.
// Parameters:
// sInput = input string
// seed = seed for pseudo-randomizing the position and injected character
// lenOut = length of head of string that will eventually survive truncation.
removeSpecialCharacters: function(sInput, seed, lenOut)
{
var s = '';
var i = 0;
while (i < lenOut)
{
var j = sInput.substring(i).search(/[^a-z0-9]/i);
if (j < 0)
break;
if (j > 0)
s += sInput.substring(i, i + j);
s += String.fromCharCode((seed + i) % 26 + 65);
i += (j + 1);
}
if (i < sInput.length)
s += sInput.substring(i);
return s;
},
// Convert input string to digits-only.
// Parameters:
// sInput = input string
// seed = seed for pseudo-randomizing the position and injected character
// lenOut = length of head of string that will eventually survive truncation.
convertToDigits: function(sInput, seed, lenOut)
{
var s = '';
var i = 0;
while (i < lenOut)
{
var j = sInput.substring(i).search(/[^0-9]/i);
if (j < 0)
break;
if (j > 0)
s += sInput.substring(i, i + j);
s += String.fromCharCode((seed + sInput.charCodeAt(i)) % 10 + 48);
i += (j + 1);
}
if (i < sInput.length)
s += sInput.substring(i);
return s;
},
}
</script>