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encrypt.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Encrypt / decrypt message</title>
<style>
* {
box-sizing: border-box;
}
body {
font-family: Helvetica, Arial, sans-serif;
line-height: 1.6;
margin: 0;
padding: 20px;
background-color: #f5f5f5;
color: #333;
max-width: 800px;
margin: 0 auto;
}
h1, h2 {
margin-top: 0;
color: #2c3e50;
}
.container {
background-color: white;
border-radius: 8px;
padding: 25px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
margin-bottom: 20px;
}
input, textarea {
width: 100%;
padding: 12px;
margin-bottom: 15px;
border: 1px solid #ddd;
border-radius: 4px;
font-size: 16px;
font-family: Helvetica, Arial, sans-serif;
}
textarea {
min-height: 150px;
resize: vertical;
}
button {
background-color: #3498db;
border: none;
color: white;
padding: 12px 20px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
cursor: pointer;
border-radius: 4px;
transition: background-color 0.3s;
}
button:hover {
background-color: #2980b9;
}
#encrypt-ui, #decrypt-ui {
display: none;
}
.active {
display: block !important;
}
.error {
color: #e74c3c;
margin-top: 10px;
}
.success {
color: #2ecc71;
margin-top: 10px;
}
#copy-button {
background-color: #2ecc71;
}
#copy-button:hover {
background-color: #27ae60;
}
#decrypt-result {
background-color: #f8f9fa;
padding: 15px;
border-radius: 4px;
border-left: 4px solid #3498db;
margin-top: 20px;
white-space: pre-wrap;
word-break: break-word;
}
.url-display {
word-break: break-all;
padding: 10px;
background-color: #f0f0f0;
border-radius: 4px;
margin: 15px 0;
font-family: monospace;
}
.tabs {
display: flex;
margin-bottom: 20px;
}
.tab {
padding: 10px 20px;
background-color: #f0f0f0;
cursor: pointer;
border-radius: 4px 4px 0 0;
margin-right: 5px;
}
.tab.active {
background-color: #3498db;
color: white;
}
</style>
</head>
<body>
<h1>Encrypt / decrypt message</h1>
<div class="tabs">
<div class="tab" id="encrypt-tab">Encrypt a message</div>
<div class="tab" id="decrypt-tab">Decrypt a message</div>
</div>
<div id="encrypt-ui" class="container">
<h2>Encrypt your message</h2>
<form id="encrypt-form">
<div>
<label for="encrypt-passphrase">Passphrase:</label>
<input type="password" id="encrypt-passphrase" placeholder="Enter a secure passphrase" autocomplete="new-password" required>
</div>
<div>
<label for="message">Message:</label>
<textarea id="message" placeholder="Enter your secret message here..." required></textarea>
</div>
<button type="submit" id="encrypt-button">Encrypt message</button>
</form>
<div id="encrypt-result" style="display:none;">
<h3>Encrypted message</h3>
<div id="encrypted-text" class="url-display"></div>
<p>Share this link:</p>
<div id="share-url" class="url-display"></div>
<button id="copy-button">Copy link to clipboard</button>
<div id="copy-status"></div>
</div>
<p>Encrypt a message with a passphrase, send a link to someone and they can use that passphrase to decrypt your message.</p>
</div>
<div id="decrypt-ui" class="container">
<h2>Decrypt a message</h2>
<div id="decrypt-message-container">
<p>This page contains an encrypted message.</p>
<form id="decrypt-form">
<div>
<label for="decrypt-passphrase">Enter passphrase to decrypt:</label>
<input type="password" id="decrypt-passphrase" placeholder="Enter the passphrase" autocomplete="new-password" required>
</div>
<button type="submit" id="decrypt-button">Decrypt message</button>
</form>
<div id="decrypt-error" class="error"></div>
<div id="decrypt-result" style="display:none;"></div>
</div>
</div>
<script type="module">
// Utility functions for encryption/decryption
const encryptionUtils = {
async generateKey(passphrase, salt) {
// Convert passphrase to key material
const encoder = new TextEncoder();
const passphraseData = encoder.encode(passphrase);
// Use PBKDF2 to derive a key from the passphrase
const importedKey = await crypto.subtle.importKey(
'raw',
passphraseData,
{ name: 'PBKDF2' },
false,
['deriveBits', 'deriveKey']
);
// Derive an AES-GCM key using PBKDF2
return crypto.subtle.deriveKey(
{
name: 'PBKDF2',
salt: salt,
iterations: 100000,
hash: 'SHA-256'
},
importedKey,
{ name: 'AES-GCM', length: 256 },
false,
['encrypt', 'decrypt']
);
},
async encrypt(message, passphrase) {
try {
// Generate a random salt and IV
const salt = crypto.getRandomValues(new Uint8Array(16));
const iv = crypto.getRandomValues(new Uint8Array(12));
// Generate encryption key from passphrase
const key = await this.generateKey(passphrase, salt);
// Encrypt the message
const encoder = new TextEncoder();
const messageData = encoder.encode(message);
const encryptedData = await crypto.subtle.encrypt(
{ name: 'AES-GCM', iv },
key,
messageData
);
// Combine salt, IV, and encrypted data into one array
const combinedData = new Uint8Array(salt.length + iv.length + encryptedData.byteLength);
combinedData.set(salt, 0);
combinedData.set(iv, salt.length);
combinedData.set(new Uint8Array(encryptedData), salt.length + iv.length);
// Convert to base64 for easy URL sharing
return btoa(String.fromCharCode.apply(null, combinedData));
} catch (error) {
console.error('Encryption error:', error);
throw new Error('Failed to encrypt the message');
}
},
async decrypt(encryptedMessage, passphrase) {
try {
// Convert base64 back to Uint8Array
const binaryString = atob(encryptedMessage);
const bytes = new Uint8Array(binaryString.length);
for (let i = 0; i < binaryString.length; i++) {
bytes[i] = binaryString.charCodeAt(i);
}
// Extract salt, IV, and encrypted data
const salt = bytes.slice(0, 16);
const iv = bytes.slice(16, 28);
const encryptedData = bytes.slice(28);
// Generate decryption key from passphrase
const key = await this.generateKey(passphrase, salt);
// Decrypt the message
const decryptedData = await crypto.subtle.decrypt(
{ name: 'AES-GCM', iv },
key,
encryptedData
);
// Convert decrypted data to string
const decoder = new TextDecoder();
return decoder.decode(decryptedData);
} catch (error) {
console.error('Decryption error:', error);
throw new Error('Failed to decrypt the message. Wrong passphrase?');
}
}
};
// UI management functions
const uiManager = {
init() {
// Get UI elements
this.encryptTab = document.getElementById('encrypt-tab');
this.decryptTab = document.getElementById('decrypt-tab');
this.encryptUI = document.getElementById('encrypt-ui');
this.decryptUI = document.getElementById('decrypt-ui');
this.encryptForm = document.getElementById('encrypt-form');
this.decryptForm = document.getElementById('decrypt-form');
this.copyButton = document.getElementById('copy-button');
// Set up event listeners
this.encryptTab.addEventListener('click', () => this.showTab('encrypt'));
this.decryptTab.addEventListener('click', () => this.showTab('decrypt'));
this.encryptForm.addEventListener('submit', this.handleEncrypt.bind(this));
this.decryptForm.addEventListener('submit', this.handleDecrypt.bind(this));
this.copyButton.addEventListener('click', this.copyToClipboard.bind(this));
// Check URL fragment for encrypted message
this.checkUrlFragment();
},
showTab(tab) {
if (tab === 'encrypt') {
this.encryptTab.classList.add('active');
this.decryptTab.classList.remove('active');
this.encryptUI.classList.add('active');
this.decryptUI.classList.remove('active');
} else {
this.encryptTab.classList.remove('active');
this.decryptTab.classList.add('active');
this.encryptUI.classList.remove('active');
this.decryptUI.classList.add('active');
}
},
checkUrlFragment() {
const fragment = window.location.hash.substring(1);
if (fragment) {
// We have an encrypted message in the URL
this.showTab('decrypt');
// Focus on passphrase input for better UX
setTimeout(() => {
document.getElementById('decrypt-passphrase').focus();
}, 100);
} else {
// No encrypted message, default to encrypt view
this.showTab('encrypt');
}
},
async handleEncrypt(event) {
event.preventDefault();
const passphrase = document.getElementById('encrypt-passphrase').value;
const message = document.getElementById('message').value;
if (!passphrase || !message) {
alert('Please enter both a passphrase and message.');
return;
}
try {
const encryptedMessage = await encryptionUtils.encrypt(message, passphrase);
// Display encrypted message
document.getElementById('encrypted-text').textContent = encryptedMessage;
// Update URL with encrypted message
const shareUrl = `${window.location.origin}${window.location.pathname}#${encryptedMessage}`;
document.getElementById('share-url').textContent = shareUrl;
// Show result section
document.getElementById('encrypt-result').style.display = 'block';
// Update URL fragment
window.location.hash = encryptedMessage;
} catch (error) {
alert(error.message);
}
},
async handleDecrypt(event) {
event.preventDefault();
const fragment = window.location.hash.substring(1);
const passphrase = document.getElementById('decrypt-passphrase').value;
if (!passphrase) {
alert('Please enter the passphrase.');
return;
}
if (!fragment) {
alert('No encrypted message found. Please check your URL.');
return;
}
try {
const decryptedMessage = await encryptionUtils.decrypt(fragment, passphrase);
// Display decrypted message
const decryptResult = document.getElementById('decrypt-result');
decryptResult.textContent = decryptedMessage;
decryptResult.style.display = 'block';
// Clear any previous errors
document.getElementById('decrypt-error').textContent = '';
} catch (error) {
document.getElementById('decrypt-error').textContent = error.message;
document.getElementById('decrypt-result').style.display = 'none';
}
},
copyToClipboard() {
const shareUrl = document.getElementById('share-url').textContent;
navigator.clipboard.writeText(shareUrl)
.then(() => {
const statusElement = document.getElementById('copy-status');
statusElement.textContent = 'Link copied to clipboard!';
statusElement.className = 'success';
setTimeout(() => {
statusElement.textContent = '';
}, 3000);
})
.catch(err => {
document.getElementById('copy-status').textContent = 'Failed to copy: ' + err;
document.getElementById('copy-status').className = 'error';
});
}
};
// Initialize the application
document.addEventListener('DOMContentLoaded', () => {
uiManager.init();
});
</script>
</body>
</html>