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index.html
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<!DOCTYPE html>
<html>
<head>
<title>GPG Online</title>
<script src="openpgp.min.js"></script>
<style type="text/css">
body, button, textarea, pre {
font-family: Consolas;
}
textarea {
width: 500px;
border: 1px solid silver;
border-radius: 3px;
padding: 0.2rem;
}
button {
font-size: 1rem;
border: 1px solid black;
background: white;
cursor: pointer;
padding: 3px 5px 1px 5px;
}
pre, textarea, input {
font-size: 0.8rem;
}
h2 {
margin: 0;
font-weight: normal;
}
#private-key {
display: none;
}
#private-key.visible {
display: block;
}
.hint {
font-size: 0.7rem;
margin: 0;
color: gray;
}
</style>
</head>
<body>
<h1>GPG Online</h1>
<div class="message">
<h2>Message to encrypt</h2>
<textarea rows="5"></textarea>
</div>
<div id="public-keys">
<div class="public-key">
<h2>Public key</h2>
<p class="hint">Only the person who has a private key will be able to decrypt the message.</p>
<textarea rows="5"></textarea>
</div>
</div>
<div id="private-key">
<h2>Private Key</h2>
<textarea rows="5"></textarea>
<h2>Passphrase</h2>
<textarea rows="2"></textarea>
</div>
<pre id="output"></pre>
<button id="encrypt">Encrypt</button>
<button id="add-public-key">Add Public Key</button>
<button id="add-private-key">Add Private Key</button>
<script>
const query = query => document.querySelector(query);
const queryAll = query => Array.prototype.slice.apply(document.querySelectorAll(query));
const publicKeyTemplate = query('#public-keys').innerHTML;
query('#add-public-key').addEventListener('click', () => {
const element = document.createElement('div');
element.innerHTML = publicKeyTemplate;
query('#public-keys').appendChild(element);
});
query('#add-private-key').addEventListener('click', () => {
query('#private-key').className = 'visible';
});
function getKey(textarea, type) {
const { value } = textarea;
if (!value) {
throw new Error(`${type} key missing`);
}
return openpgp.key.readArmored(value).keys[0];
}
function getPrivateKey() {
if (query('#private-key').className !== 'visible') {
return Promise.resolve();
}
const [key, passphrase] = queryAll('#private-key textarea');
return openpgp.decryptKey({
privateKey: getKey(key, 'private'),
passphrase: passphrase.value,
})
.then(({key}) => key)
;
}
query('#encrypt').addEventListener('click', () => {
getPrivateKey().then(privateKey => {
const options = {
data: query('.message textarea').value,
publicKeys: queryAll('.public-key textarea').map(el => getKey(el, 'public')),
privateKey: privateKey,
armor: true,
};
return openpgp.encrypt(options).then(results => {
query('#output').innerHTML = results.data;
});
})
.catch(err => alert(err.message))
;
});
</script>
<p>
This page uses industry vetted open source <a href="https://github.com/openpgpjs/openpgpjs">OpenPGP.js</a> and does not submit anything to the server. Everything happens in your browser and is completely lost when you close this page.
</p>
</body>
</html>