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# infohash ↔ base64 tool
You can check the tool at
<https://magmaus3.codeberg.page/infohash2base64/> (requires javascript)
This tool was made to work with
[an suggestion posted by @toxictenement@lemmy.dbzer0.com](https://lemmy.dbzer0.com/post/1009713)
by [magmaus3](https://magmaus3.eu.org).
You can check the source code by downloading the page
(everything is stored in a single html file),
by going to your browser's devtools or on [Codeberg](https://codeberg.org/magmaus3/infohash2base64).

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<!DOCTYPE html>
<html lang="en">
<head>
<title>infohash ↔ base64</title>
<title></title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script>
// @license http://www.wtfpl.net/txt/copying/ WTFPL
function infohashToBase64(infohash) {
// Converts an hex infohash into base64.
// Convert hex into an byte array
let byteArray = infohash.replace(/[^0-9a-fA-F]/g, '')
/*
* TODO:
* - [ ] rewrite functions to not use copied functions
* - [x] add UI
* - [x] add style
* - [ ] make everything not look like made at 0:41 on a phone
*/
function hexToBytes(hexdata) {
// https://stackoverflow.com/a/39396866
var arr = hexdata.replace(/[^0-9a-fA-F]/g, '')
.match(/[0-9a-fA-F]{2}/g);
for(var i = 0; i<byteArray.length; i++) {
byteArray[i] = parseInt(byteArray[i], 16);
for(var i = 0; i<arr.length; i++) {
arr[i] = parseInt(arr[i], 16);
}
// Convert byteArray into base64
return arr;
}
function bytesToBase64(byteArray) {
// https://stackoverflow.com/a/11562550
return btoa(
String.fromCharCode.apply(
null, new Uint8Array(byteArray)
)
);
}
function base64ToInfohash(b64) {
// Converts a base64 value into a infohash (in a hex form)
// Convert base64 into an byteArray
let binaryString = atob(b64);
let byteArray = new Uint8Array(binaryString.length);
function base64ToArray(base64) {
// https://stackoverflow.com/a/21797381
var binaryString = atob(base64);
var bytes = new Uint8Array(binaryString.length);
for (var i = 0; i < binaryString.length; i++) {
byteArray[i] = binaryString.charCodeAt(i);
bytes[i] = binaryString.charCodeAt(i);
}
// Convert byteArray into hex values
return bytes;
}
function bytesToHex(byteArray) {
// https://stackoverflow.com/a/34310051
return Array.from(byteArray, function(byte) {
return ('0' + (byte & 0xFF).toString(16)).slice(-2);
}).join('');
}
function infohashToBase64(infohash) {
return bytesToBase64(
hexToBytes(infohash)
);
}
function base64ToInfohash(b64) {
return bytesToHex(
base64ToArray(b64)
);
}
// Everything for the UI itself
// Holds the state of tabs.
// Intended values are "encode", "decode" and "about"
// Intended values are "encode" and "decode"
let tabOpen = "encode"
function switchTab(name) {
// Switches the tab
// only "encode","decode" and "about" values are supported
let url = new URL(window.location)
url.searchParams.set("tab", name)
window.history.replaceState(null, "", url.href)
if (name === "encode") {
document.getElementById("encode").style.display = "block"
document.getElementById("decode").style.display = "none"
@ -87,40 +106,33 @@
document.getElementById("decodeResult").innerText = base64ToInfohash(urlParams.get("base64value"))
}
});
// @license-end
</script>
<style>
body {
width: 100vw; height: 100vh;
margin: 0; padding: 0;
display: flex; flex-direction: column;
justify-content: center;
align-items: center;
justify-content: center; text-align: center;
background-color: #10101a;
color: white;
font-family: monospace;
}
main {
background-color: #202025;
padding: 1em;
border: 1px solid white;
border-radius: 1em;
box-shadow: 0px 5px 15px black, 0px 1px 15px black inset;
width: 50%; border-radius: 1em;
}
input {
color: white;
background-color: transparent;
border: 1px solid white;
border: 1px solid #50505a;
}
label {
margin-right: 0.5rem;
}
.tab {
display: none; /* Default value to keep tabs hidden when JS is not available */
border: 1px solid white;
padding: 1em;
border-radius: 0em 0em 1em 1em;
box-shadow: 0px 5px 15px black, 0px 1px 15px black inset;
padding: 0.5em;
border-radius: 0em 1em 1em 1em;
}
.result:empty { display: none;}
.result {
@ -130,52 +142,36 @@
border: 1px solid gray;
border-radius: 1em;
}
.tab, .tabBar {
.tabBar {
display: none; /* Default value to keep tabs hidden when JS is not available */
border-collapse: collapse;
}
.button {
flex: 1;
text-align: center;
padding: 0.5em;
border: 1px solid white;
border-bottom: none;
transition: box-shadow 200ms ease;
}
.leftButton {
border-radius: 1em 0em 0em 0em;
}
.rightButton {
border-radius: 0em 1em 0em 0em;
}
.button:hover {
box-shadow: 0px 5px 25px black;
box-shadow: 1px 5px 15px black;
}
.button:active {
background-color: rgba(255,255,255, 0.2);
}
a { color: cyan; text-decoration: none;}
ul > li {
margin-bottom: 1em;
}
#about, .noscript {
display: block;
max-width: 40rem;
}
</style>
</head>
<body>
<main>
<h1>infohash ↔ base64</h1>
<noscript>
<div class="noscript">
<p>This tool requires JavaScript to function.</p>
<p>You can use DevTools in your browser to look at the code (it's intended to be easily readable).</p>
</div>
This tool requires JavaScript to function.
You can use DevTools in your browser to look at the code (it's intended to be easily readable).
</noscript>
<div class="tabBar">
<div onclick="switchTab('encode')" class="button leftButton">Encode</div>
<div onclick="switchTab('encode')" class="button">Encode</div>
<div onclick="switchTab('decode')" class="button">Decode</div>
<div onclick="switchTab('about')" class="button rightButton">About</div>
<div onclick="switchTab('about')" class="button">About</div>
</div>
<div class="tab" id="encode">
<form>
@ -196,39 +192,18 @@
<div class="result" id="decodeResult"></div>
</div>
<div class="tab" id="about">
<h2>About</h2>
<p>
This tool was made to work with <a href="https://lemmy.dbzer0.com/post/1009713">an suggestion posted by @toxictenement@lemmy.dbzer0.com</a>
by <a href="https://magmaus3.eu.org">magmaus3</a>.
</p>
<p>
You can check the source code by downloading the page (everything is stored in a single html file),
by going to your browser's devtools or on <a href="https://codeberg.org/magmaus3/infohash2base64">Codeberg</a>.
</p>
<h3>License</h3>
<p>Copyright © 2023 magmaus3 &lt;magmaus3@disroot.org&gt;</p>
<p>This work is free. You can redistribute it and/or modify it under the
terms of the Do What The Fuck You Want To Public License, Version 2,
as published by Sam Hocevar. See http://www.wtfpl.net/ for more details.</p>
<h3>How to copy</h3>
<ul>
<li>
On Firefox/Chromium:
<ol>
<li>Right-click on the page</li>
<li>Select <i>Save Page as...</i> or <i>Save as...</i> (or simillar option)</li>
<li>Choose file type as <i>HTML Only</i></li>
<li>Profit!</li>
</ol>
</li>
<li>
Using git:
<ol>
<li><code>git clone https://codeberg.org/magmaus3/infohash2base64</code></li>
<li>Profit!</li>
</ol>
</li>
</ul>
<form>
<h2>About</h2>
<p>
This tool was made to work with <a href="https://lemmy.dbzer0.com/post/1009713">an suggestion posted by @toxictenement@lemmy.dbzer0.com</a>
by <a href="https://magmaus3.eu.org">magmaus3</a>.
</p>
<p>
You can check the source code by downloading the page (everything is stored in a single html file),
by going to your browser's devtools or on codeberg.
</p>
</form>
<div class="result" id="decodeResult"></div>
</div>
</main>
</body>