| 1 |
/** |
| 2 |
* Secure CryptX Library - Fixed for backward compatibility |
| 3 |
*/ |
| 4 |
|
| 5 |
// Configuration constants |
| 6 |
const ITERATIONS = window.cryptxConfig?.iterations || 100000; // fallback to old value |
| 7 |
const KEY_LENGTH = window.cryptxConfig?.keyLength || 32; |
| 8 |
const IV_LENGTH = window.cryptxConfig?.ivLength || 16; |
| 9 |
const SALT_LENGTH = window.cryptxConfig?.saltLength || 16; |
| 10 |
const CONFIG = { |
| 11 |
ALLOWED_PROTOCOLS: ['http:', 'https:', 'mailto:'], |
| 12 |
MAX_URL_LENGTH: 2048, |
| 13 |
ENCRYPTION_KEY_SIZE: 32, |
| 14 |
IV_SIZE: 16 |
| 15 |
}; |
| 16 |
|
| 17 |
/** |
| 18 |
* Utility functions for secure operations |
| 19 |
*/ |
| 20 |
class SecureUtils { |
| 21 |
static getSecureRandomBytes(length) { |
| 22 |
if (typeof crypto === 'undefined' || !crypto.getRandomValues) { |
| 23 |
throw new Error('Secure random number generation not available'); |
| 24 |
} |
| 25 |
return crypto.getRandomValues(new Uint8Array(length)); |
| 26 |
} |
| 27 |
|
| 28 |
static arrayBufferToBase64(buffer) { |
| 29 |
const bytes = new Uint8Array(buffer); |
| 30 |
let binary = ''; |
| 31 |
for (let i = 0; i < bytes.byteLength; i++) { |
| 32 |
binary += String.fromCharCode(bytes[i]); |
| 33 |
} |
| 34 |
return btoa(binary); |
| 35 |
} |
| 36 |
|
| 37 |
static base64ToArrayBuffer(base64) { |
| 38 |
const binary = atob(base64); |
| 39 |
const buffer = new ArrayBuffer(binary.length); |
| 40 |
const bytes = new Uint8Array(buffer); |
| 41 |
for (let i = 0; i < binary.length; i++) { |
| 42 |
bytes[i] = binary.charCodeAt(i); |
| 43 |
} |
| 44 |
return buffer; |
| 45 |
} |
| 46 |
|
| 47 |
static validateUrl(url) { |
| 48 |
if (typeof url !== 'string' || url.length === 0) { |
| 49 |
return null; |
| 50 |
} |
| 51 |
|
| 52 |
if (url.length > CONFIG.MAX_URL_LENGTH) { |
| 53 |
console.error('URL exceeds maximum length'); |
| 54 |
return null; |
| 55 |
} |
| 56 |
|
| 57 |
try { |
| 58 |
const urlObj = new URL(url); |
| 59 |
|
| 60 |
if (!CONFIG.ALLOWED_PROTOCOLS.includes(urlObj.protocol)) { |
| 61 |
console.error('Protocol not allowed:', urlObj.protocol); |
| 62 |
return null; |
| 63 |
} |
| 64 |
|
| 65 |
if (urlObj.protocol === 'mailto:') { |
| 66 |
const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/; |
| 67 |
if (!emailRegex.test(urlObj.pathname)) { |
| 68 |
console.error('Invalid email format in mailto URL'); |
| 69 |
return null; |
| 70 |
} |
| 71 |
} |
| 72 |
|
| 73 |
return url; |
| 74 |
} catch (error) { |
| 75 |
console.error('Invalid URL format:', error.message); |
| 76 |
return null; |
| 77 |
} |
| 78 |
} |
| 79 |
|
| 80 |
static escapeJavaScript(str) { |
| 81 |
if (typeof str !== 'string') { |
| 82 |
return ''; |
| 83 |
} |
| 84 |
return str.replace(/\\/g, '\\\\') |
| 85 |
.replace(/'/g, "\\'") |
| 86 |
.replace(/"/g, '\\"') |
| 87 |
.replace(/\n/g, '\\n') |
| 88 |
.replace(/\r/g, '\\r') |
| 89 |
.replace(/\t/g, '\\t'); |
| 90 |
} |
| 91 |
} |
| 92 |
|
| 93 |
/** |
| 94 |
* Legacy encryption class - Fixed to match original PHP algorithm |
| 95 |
*/ |
| 96 |
class LegacyEncryption { |
| 97 |
/** |
| 98 |
* Decrypts using the original CryptX algorithm (matches PHP version) |
| 99 |
* @param {string} encryptedString |
| 100 |
* @returns {string} |
| 101 |
*/ |
| 102 |
static originalDecrypt(encryptedString) { |
| 103 |
if (typeof encryptedString !== 'string' || encryptedString.length === 0) { |
| 104 |
throw new Error('Invalid encrypted string'); |
| 105 |
} |
| 106 |
|
| 107 |
// Constants from original algorithm |
| 108 |
const UPPER_LIMIT = 8364; |
| 109 |
const DEFAULT_VALUE = 128; |
| 110 |
|
| 111 |
let charCode = 0; |
| 112 |
let decryptedString = "mailto:"; |
| 113 |
let encryptionKey = 0; |
| 114 |
|
| 115 |
try { |
| 116 |
for (let i = 0; i < encryptedString.length; i += 2) { |
| 117 |
if (i + 1 >= encryptedString.length) { |
| 118 |
break; |
| 119 |
} |
| 120 |
|
| 121 |
// Get the salt (encryption key) from current position |
| 122 |
encryptionKey = parseInt(encryptedString.charAt(i), 10); |
| 123 |
|
| 124 |
// Handle invalid salt values |
| 125 |
if (isNaN(encryptionKey)) { |
| 126 |
encryptionKey = 0; |
| 127 |
} |
| 128 |
|
| 129 |
// Get the character code from next position |
| 130 |
charCode = encryptedString.charCodeAt(i + 1); |
| 131 |
|
| 132 |
// Apply the same logic as original |
| 133 |
if (charCode >= UPPER_LIMIT) { |
| 134 |
charCode = DEFAULT_VALUE; |
| 135 |
} |
| 136 |
|
| 137 |
// Decrypt by subtracting the salt |
| 138 |
const decryptedCharCode = charCode - encryptionKey; |
| 139 |
|
| 140 |
// Validate the result |
| 141 |
if (decryptedCharCode < 0 || decryptedCharCode > 1114111) { |
| 142 |
throw new Error('Invalid character code during decryption'); |
| 143 |
} |
| 144 |
|
| 145 |
decryptedString += String.fromCharCode(decryptedCharCode); |
| 146 |
} |
| 147 |
|
| 148 |
return decryptedString; |
| 149 |
} catch (error) { |
| 150 |
throw new Error('Original decryption failed: ' + error.message); |
| 151 |
} |
| 152 |
} |
| 153 |
|
| 154 |
/** |
| 155 |
* Encrypts using the original CryptX algorithm (matches PHP version) |
| 156 |
* @param {string} inputString |
| 157 |
* @returns {string} |
| 158 |
*/ |
| 159 |
static originalEncrypt(inputString) { |
| 160 |
if (typeof inputString !== 'string' || inputString.length === 0) { |
| 161 |
throw new Error('Invalid input string'); |
| 162 |
} |
| 163 |
|
| 164 |
// Remove "mailto:" prefix if present for encryption |
| 165 |
const cleanInput = inputString.replace(/^mailto:/, ''); |
| 166 |
let crypt = ''; |
| 167 |
|
| 168 |
// ASCII values blacklist (from PHP constant) |
| 169 |
const ASCII_VALUES_BLACKLIST = ['32', '34', '39', '60', '62', '63', '92', '94', '96', '127']; |
| 170 |
|
| 171 |
try { |
| 172 |
for (let i = 0; i < cleanInput.length; i++) { |
| 173 |
let salt, asciiValue; |
| 174 |
let attempts = 0; |
| 175 |
const maxAttempts = 20; // Prevent infinite loops |
| 176 |
|
| 177 |
do { |
| 178 |
if (attempts >= maxAttempts) { |
| 179 |
// Fallback to a safe salt if we can't find a valid one |
| 180 |
salt = 1; |
| 181 |
asciiValue = cleanInput.charCodeAt(i) + salt; |
| 182 |
break; |
| 183 |
} |
| 184 |
|
| 185 |
// Generate random number between 0 and 3 (matching PHP rand(0,3)) |
| 186 |
const randomValues = SecureUtils.getSecureRandomBytes(1); |
| 187 |
salt = randomValues[0] % 4; |
| 188 |
|
| 189 |
// Get ASCII value and add salt |
| 190 |
asciiValue = cleanInput.charCodeAt(i) + salt; |
| 191 |
|
| 192 |
// Check if value exceeds limit (matching PHP logic) |
| 193 |
if (asciiValue >= 8364) { |
| 194 |
asciiValue = 128; |
| 195 |
} |
| 196 |
|
| 197 |
attempts++; |
| 198 |
} while (ASCII_VALUES_BLACKLIST.includes(asciiValue.toString()) && attempts < maxAttempts); |
| 199 |
|
| 200 |
// Append salt and character to result |
| 201 |
crypt += salt.toString() + String.fromCharCode(asciiValue); |
| 202 |
} |
| 203 |
|
| 204 |
return crypt; |
| 205 |
} catch (error) { |
| 206 |
throw new Error('Original encryption failed: ' + error.message); |
| 207 |
} |
| 208 |
} |
| 209 |
} |
| 210 |
|
| 211 |
/** |
| 212 |
* Modern encryption class using Web Crypto API - PHP Compatible |
| 213 |
*/ |
| 214 |
class SecureEncryption { |
| 215 |
static async deriveKey(password, salt) { |
| 216 |
const encoder = new TextEncoder(); |
| 217 |
const keyMaterial = await crypto.subtle.importKey( |
| 218 |
'raw', |
| 219 |
encoder.encode(password), |
| 220 |
{ name: 'PBKDF2' }, |
| 221 |
false, |
| 222 |
['deriveKey'] |
| 223 |
); |
| 224 |
|
| 225 |
return crypto.subtle.deriveKey( |
| 226 |
{ |
| 227 |
name: 'PBKDF2', |
| 228 |
salt: salt, |
| 229 |
iterations: ITERATIONS, |
| 230 |
hash: 'SHA-256' |
| 231 |
}, |
| 232 |
keyMaterial, |
| 233 |
{ name: 'AES-GCM', length: KEY_LENGTH * 8}, |
| 234 |
false, |
| 235 |
['encrypt', 'decrypt'] |
| 236 |
); |
| 237 |
} |
| 238 |
|
| 239 |
static async encrypt(plaintext, password) { |
| 240 |
if (typeof plaintext !== 'string' || typeof password !== 'string') { |
| 241 |
throw new Error('Both plaintext and password must be strings'); |
| 242 |
} |
| 243 |
|
| 244 |
const encoder = new TextEncoder(); |
| 245 |
const salt = SecureUtils.getSecureRandomBytes(16); |
| 246 |
const iv = SecureUtils.getSecureRandomBytes(CONFIG.IV_SIZE); |
| 247 |
|
| 248 |
const key = await this.deriveKey(password, salt); |
| 249 |
|
| 250 |
const encrypted = await crypto.subtle.encrypt( |
| 251 |
{ name: 'AES-GCM', iv: iv }, |
| 252 |
key, |
| 253 |
encoder.encode(plaintext) |
| 254 |
); |
| 255 |
|
| 256 |
// Match PHP format: salt(16) + iv(16) + encrypted_data + tag(16) |
| 257 |
const encryptedArray = new Uint8Array(encrypted); |
| 258 |
const encryptedData = encryptedArray.slice(0, -16); // Remove tag from encrypted data |
| 259 |
const tag = encryptedArray.slice(-16); // Get the tag |
| 260 |
|
| 261 |
const combined = new Uint8Array(salt.length + iv.length + encryptedData.length + tag.length); |
| 262 |
combined.set(salt, 0); |
| 263 |
combined.set(iv, salt.length); |
| 264 |
combined.set(encryptedData, salt.length + iv.length); |
| 265 |
combined.set(tag, salt.length + iv.length + encryptedData.length); |
| 266 |
|
| 267 |
return SecureUtils.arrayBufferToBase64(combined.buffer); |
| 268 |
} |
| 269 |
|
| 270 |
static async decrypt(encryptedData, password) { |
| 271 |
if (typeof encryptedData !== 'string' || typeof password !== 'string') { |
| 272 |
throw new Error('Both encryptedData and password must be strings'); |
| 273 |
} |
| 274 |
|
| 275 |
try { |
| 276 |
const combined = SecureUtils.base64ToArrayBuffer(encryptedData); |
| 277 |
const totalLength = combined.byteLength; |
| 278 |
|
| 279 |
// PHP format: salt(16) + iv(16) + encrypted_data + tag(16) |
| 280 |
const saltLength = 16; |
| 281 |
const ivLength = 16; |
| 282 |
const tagLength = 16; |
| 283 |
const encryptedDataLength = totalLength - saltLength - ivLength - tagLength; |
| 284 |
|
| 285 |
if (totalLength < saltLength + ivLength + tagLength) { |
| 286 |
throw new Error('Encrypted data too short'); |
| 287 |
} |
| 288 |
|
| 289 |
const salt = combined.slice(0, saltLength); |
| 290 |
const iv = combined.slice(saltLength, saltLength + ivLength); |
| 291 |
const encryptedDataOnly = combined.slice(saltLength + ivLength, saltLength + ivLength + encryptedDataLength); |
| 292 |
const tag = combined.slice(-tagLength); // Last 16 bytes |
| 293 |
|
| 294 |
const key = await this.deriveKey(password, new Uint8Array(salt)); |
| 295 |
|
| 296 |
// Reconstruct the encrypted data with tag for Web Crypto API |
| 297 |
const encryptedWithTag = new Uint8Array(encryptedDataOnly.byteLength + tag.byteLength); |
| 298 |
encryptedWithTag.set(new Uint8Array(encryptedDataOnly), 0); |
| 299 |
encryptedWithTag.set(new Uint8Array(tag), encryptedDataOnly.byteLength); |
| 300 |
|
| 301 |
const decrypted = await crypto.subtle.decrypt( |
| 302 |
{ name: 'AES-GCM', iv: new Uint8Array(iv) }, |
| 303 |
key, |
| 304 |
encryptedWithTag |
| 305 |
); |
| 306 |
|
| 307 |
const decoder = new TextDecoder(); |
| 308 |
return decoder.decode(decrypted); |
| 309 |
} catch (error) { |
| 310 |
throw new Error('Decryption failed: ' + error.message); |
| 311 |
} |
| 312 |
} |
| 313 |
} |
| 314 |
|
| 315 |
/** |
| 316 |
* Main CryptX functions with backward compatibility |
| 317 |
*/ |
| 318 |
|
| 319 |
/** |
| 320 |
* Securely decrypts and validates a URL before navigation |
| 321 |
* @param {string} encryptedUrl |
| 322 |
* @param {string} password |
| 323 |
*/ |
| 324 |
async function secureDecryptAndNavigate(encryptedUrl, password = 'default_key') { |
| 325 |
if (typeof encryptedUrl !== 'string' || encryptedUrl.length === 0) { |
| 326 |
console.error('Invalid encrypted URL provided'); |
| 327 |
return; |
| 328 |
} |
| 329 |
|
| 330 |
try { |
| 331 |
let decryptedUrl; |
| 332 |
|
| 333 |
// Try modern decryption first, then fall back to original algorithm |
| 334 |
try { |
| 335 |
decryptedUrl = await SecureEncryption.decrypt(encryptedUrl, password); |
| 336 |
} catch (modernError) { |
| 337 |
console.warn('Modern decryption failed, trying original algorithm'); |
| 338 |
decryptedUrl = LegacyEncryption.originalDecrypt(encryptedUrl); |
| 339 |
} |
| 340 |
|
| 341 |
const validatedUrl = SecureUtils.validateUrl(decryptedUrl); |
| 342 |
if (!validatedUrl) { |
| 343 |
console.error('Invalid or unsafe URL detected'); |
| 344 |
return; |
| 345 |
} |
| 346 |
|
| 347 |
window.location.href = validatedUrl; |
| 348 |
|
| 349 |
} catch (error) { |
| 350 |
console.error('Error during URL decryption and navigation:', error.message); |
| 351 |
} |
| 352 |
} |
| 353 |
|
| 354 |
/** |
| 355 |
* Legacy function for backward compatibility - using original algorithm |
| 356 |
* @param {string} encryptedString |
| 357 |
* @returns {string|null} |
| 358 |
*/ |
| 359 |
function DeCryptString(encryptedString) { |
| 360 |
try { |
| 361 |
return LegacyEncryption.originalDecrypt(encryptedString); |
| 362 |
} catch (error) { |
| 363 |
console.error('Legacy decryption failed:', error.message); |
| 364 |
return null; |
| 365 |
} |
| 366 |
} |
| 367 |
|
| 368 |
/** |
| 369 |
* Legacy function for backward compatibility - secured |
| 370 |
* @param {string} encryptedUrl |
| 371 |
*/ |
| 372 |
function DeCryptX(encryptedUrl) { |
| 373 |
const decryptedUrl = DeCryptString(encryptedUrl); |
| 374 |
if (!decryptedUrl) { |
| 375 |
console.error('Failed to decrypt URL'); |
| 376 |
return; |
| 377 |
} |
| 378 |
|
| 379 |
const validatedUrl = SecureUtils.validateUrl(decryptedUrl); |
| 380 |
if (!validatedUrl) { |
| 381 |
console.error('Invalid or unsafe URL detected'); |
| 382 |
return; |
| 383 |
} |
| 384 |
|
| 385 |
window.location.href = validatedUrl; |
| 386 |
} |
| 387 |
|
| 388 |
/** |
| 389 |
* Generates encrypted email link with proper security |
| 390 |
* @param {string} emailAddress |
| 391 |
* @param {string} password |
| 392 |
* @returns {Promise<string>} |
| 393 |
*/ |
| 394 |
async function generateSecureEmailLink(emailAddress, password = 'default_key') { |
| 395 |
if (typeof emailAddress !== 'string' || emailAddress.length === 0) { |
| 396 |
throw new Error('Valid email address required'); |
| 397 |
} |
| 398 |
|
| 399 |
const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/; |
| 400 |
if (!emailRegex.test(emailAddress)) { |
| 401 |
throw new Error('Invalid email format'); |
| 402 |
} |
| 403 |
|
| 404 |
const mailtoUrl = `mailto:${emailAddress}`; |
| 405 |
const encryptedData = await SecureEncryption.encrypt(mailtoUrl, password); |
| 406 |
const escapedData = SecureUtils.escapeJavaScript(encryptedData); |
| 407 |
|
| 408 |
return `javascript:secureDecryptAndNavigate('${escapedData}', '${SecureUtils.escapeJavaScript(password)}')`; |
| 409 |
} |
| 410 |
|
| 411 |
/** |
| 412 |
* Legacy function for backward compatibility - using original algorithm |
| 413 |
* @param {string} emailAddress |
| 414 |
* @returns {string} |
| 415 |
*/ |
| 416 |
function generateDeCryptXHandler(emailAddress) { |
| 417 |
if (typeof emailAddress !== 'string' || emailAddress.length === 0) { |
| 418 |
console.error('Valid email address required'); |
| 419 |
return 'javascript:void(0)'; |
| 420 |
} |
| 421 |
|
| 422 |
try { |
| 423 |
const encrypted = LegacyEncryption.originalEncrypt(emailAddress); |
| 424 |
const escaped = SecureUtils.escapeJavaScript(encrypted); |
| 425 |
return `javascript:DeCryptX('${escaped}')`; |
| 426 |
} catch (error) { |
| 427 |
console.error('Error generating handler:', error.message); |
| 428 |
return 'javascript:void(0)'; |
| 429 |
} |
| 430 |
} |
| 431 |
|
| 432 |
/** |
| 433 |
* Legacy function - matches original PHP generateHashFromString |
| 434 |
* @param {string} inputString |
| 435 |
* @returns {string} |
| 436 |
*/ |
| 437 |
function generateHashFromString(inputString) { |
| 438 |
try { |
| 439 |
return LegacyEncryption.originalEncrypt(inputString); |
| 440 |
} catch (error) { |
| 441 |
console.error('Error generating hash:', error.message); |
| 442 |
return ''; |
| 443 |
} |
| 444 |
} |
| 445 |
|
| 446 |
// Export functions for module usage |
| 447 |
if (typeof module !== 'undefined' && module.exports) { |
| 448 |
module.exports = { |
| 449 |
secureDecryptAndNavigate, |
| 450 |
generateSecureEmailLink, |
| 451 |
DeCryptX, |
| 452 |
DeCryptString, |
| 453 |
generateDeCryptXHandler, |
| 454 |
generateHashFromString, |
| 455 |
SecureEncryption, |
| 456 |
LegacyEncryption, |
| 457 |
SecureUtils |
| 458 |
}; |
| 459 |
} |
