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<!DOCTYPE html>
<html lang="en" data-theme="dark">
<head>
<meta charset="UTF-8">
<meta name="description" content="AES-256 Encryption Example">
<title>Secure Paste</title>
<link rel="icon" href="./favicon.svg" type="image/svg+xml">
<link rel="stylesheet" href="./pico.min.css">
</head>
<body>
<main class="container">
<h1>paste-cgi</h1>
<form id="cryptoForm">
<label for="title">Title</label>
<input type="text" id="title" placeholder="Enter a title" required />
<label for="plaintext">Paste</label>
<textarea id="plaintext" rows="5" placeholder="Enter your paste" required></textarea>
<label for="pasteType">Type</label>
<select id="pasteType" onchange="togglePasteType()">
<option value="plain">Plain</option>
<option value="password">Password</option>
</select>
<div id="passwordField" style="display: none;">
<label for="password">Password</label>
<input type="password" id="password" placeholder="Enter your password" />
</div>
<label for="expiration">Expiration</label>
<select id="expiration">
<option value="never">Never</option>
<option value="burn_after_read">Burn after read</option>
<option value="10_minutes">10 minutes</option>
<option value="1_hour">1 hour</option>
<option value="1_day">1 Day</option>
<option value="1_week">1 Week</option>
<option value="2_weeks">2 Weeks</option>
<option value="1_month">1 Month</option>
<option value="6_months">6 Months</option>
<option value="1_year">1 Year</option>
</select>
<button type="button" id="encryptBtn" onclick="handlePaste()">Paste</button>
</form>
<div id="pasteUrlSection" style="display: none;">
<h3>Paste Url:</h3>
<input id="pasteUrl" readonly></textarea>
<button type="button" onclick="copyPaste()">Copy</button>
</div>
</main>
<script>
const pasteTypeConstant = "pasteType";
const passwordFieldConstant = "passwordField";
const passwordTypeConstant = "password";
const plainTypeConstant = "plain";
const titleConstant = "title";
const expirationConstant = "expiration";
const plaintextConstant = "plaintext";
const pasteUrlConstant = "pasteUrl"
const pasteUrlSectionConstant = "pasteUrlSection"
function copyPaste(){
var copyText = document.getElementById(pasteUrlConstant);
copyText.select();
copyText.setSelectionRange(0, 99999);
navigator.clipboard.writeText(copyText.value);
}
function togglePasteType() {
const passwordType = document.getElementById(pasteTypeConstant).value;
const passwordField = document.getElementById(passwordFieldConstant);
if (passwordType === passwordTypeConstant) {
passwordField.style.display = 'block';
} else {
passwordField.style.display = 'none';
}
}
async function deriveKey(password, salt) {
let encodedPassword = new TextEncoder().encode(password);
let baseKey = await window.crypto.subtle.importKey(
"raw",
encodedPassword,
{ name: "PBKDF2" },
false,
["deriveKey"],
);
let derivedKey = await window.crypto.subtle.deriveKey(
{
name: "PBKDF2",
salt: salt,
iterations: 600000,
hash: "SHA-256",
},
baseKey,
{ name: "AES-GCM", length: 256 },
true,
["encrypt", "decrypt"],
);
return derivedKey;
}
async function encryptData(data, password) {
let salt = window.crypto.getRandomValues(new Uint8Array(16));
let iv = window.crypto.getRandomValues(new Uint8Array(12));
let key = await deriveKey(password, salt);
let encodedData = new TextEncoder().encode(data);
let encryptedContent = await window.crypto.subtle.encrypt(
{
name: "AES-GCM",
iv: iv,
tagLength: 128,
},
key,
encodedData,
);
let ciphertext = encryptedContent.slice(
0,
encryptedContent.byteLength - 16,
);
let authTag = encryptedContent.slice(encryptedContent.byteLength - 16);
return {
ciphertext: new Uint8Array(ciphertext),
iv: iv,
authTag: new Uint8Array(authTag),
salt: salt,
};
}
async function handlePaste() {
let type = document.getElementById(pasteTypeConstant).value;
let title = document.getElementById(titleConstant).value;
let expiration = document.getElementById(expirationConstant).value;
let plaintext = document.getElementById(plaintextConstant).value;
let password = document.getElementById(passwordTypeConstant).value;
let pasted_text = ""
if (type == plainTypeConstant) {
if (!plaintext || !title) return alert("Enter title and paste.");
pasted_text = plaintext
}
else {
if (!plaintext || !password || !title) return alert("Enter title, paste and password.");
let encrypted = await encryptData(plaintext, password);
pasted_text = btoa(JSON.stringify(encrypted))
}
let currentPath = window.location.origin;
try {
let response = await fetch(currentPath + "/submit", {
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify({
type: type,
title: title,
expiration: expiration,
pasted_text: pasted_text
}),
});
if (response.ok) {
let jsonResponse = await response.json();
document.getElementById(pasteUrlConstant).value = currentPath + "/get?id=" + jsonResponse.id;
document.getElementById(pasteUrlSectionConstant).style.display = 'block';
} else {
console.error("Failed to submit data. Status:", response.status);
}
} catch (error) {
console.error("Error making the POST request:", error);
}
}
</script>
</body>
</html>
|
