← All changes | js/cryptx.js +753 -17 1.6 → trunk View file →

		@@ -1,20 +1,756 @@
1		-function DeCryptString( s )
2		-{
3		- var n = 0;
4		- var r = "mailto:";
5		- for( var i = 0; i < s.length; i++)
6		- {
7		- n = s.charCodeAt( i );
8		- if( n >= 8364 )
9		- {
10		- n = 128;
11		- }
12		- r += String.fromCharCode( n - 1 );
	1	+/**
	2	+ * Secure CryptX Library - Fixed for backward compatibility
	3	+ *
	4	+ * Everything below lives inside an IIFE. Without it, the top-level `const` and
	5	+ * `class` declarations -- CONFIG, ITERATIONS, KEY_LENGTH, SecureUtils,
	6	+ * SecureEncryption -- sit in the global lexical environment of the page, and a
	7	+ * second script declaring any of those names does not merely overwrite them:
	8	+ * it throws "Identifier has already been declared" and one of the two scripts
	9	+ * stops dead. With names this general that is a matter of time, and the failure
	10	+ * would look like CryptX being broken for no reason.
	11	+ *
	12	+ * What the outside is meant to reach is assigned to `window` at the bottom,
	13	+ * deliberately and by name.
	14	+ */
	15	+(function () {
	16	+
	17	+// Configuration constants
	18	+// The ceiling PHP already enforces (SecureEncryption::MAX_ITERATIONS), repeated
	19	+// here so that no path can hand an absurd number to PBKDF2 and leave a
	20	+// visitor's browser tab grinding.
	21	+const MAX_ROUNDS = 1000000;
	22	+
	23	+// parseInt, because wp_localize_script turns every value into a string on the
	24	+// way into the page -- so cryptxConfig.iterations arrives as "10000", and a
	25	+// string fails Number.isInteger. Without this the clamp below applied only to
	26	+// the value read from a link and never to this one, which is the opposite of
	27	+// what one would assume from reading it.
	28	+const ITERATIONS = Math.min(
	29	+ parseInt(window.cryptxConfig?.iterations, 10) || 100000, // fallback to old value
	30	+ MAX_ROUNDS
	31	+);
	32	+const KEY_LENGTH = window.cryptxConfig?.keyLength || 32;
	33	+const IV_LENGTH = window.cryptxConfig?.ivLength || 16;
	34	+const SALT_LENGTH = window.cryptxConfig?.saltLength || 16;
	35	+const CONFIG = {
	36	+ ALLOWED_PROTOCOLS: ['http:', 'https:', 'mailto:'],
	37	+ MAX_URL_LENGTH: 2048,
	38	+ ENCRYPTION_KEY_SIZE: 32,
	39	+ IV_SIZE: 16
	40	+};
	41	+
	42	+/**
	43	+ * Utility functions for secure operations
	44	+ */
	45	+class SecureUtils {
	46	+ static getSecureRandomBytes(length) {
	47	+ if (typeof crypto === 'undefined' || !crypto.getRandomValues) {
	48	+ throw new Error('Secure random number generation not available');
	49	+ }
	50	+ return crypto.getRandomValues(new Uint8Array(length));
13	51	}
14		- return r;
	52	+
	53	+ static arrayBufferToBase64(buffer) {
	54	+ const bytes = new Uint8Array(buffer);
	55	+ let binary = '';
	56	+ for (let i = 0; i < bytes.byteLength; i++) {
	57	+ binary += String.fromCharCode(bytes[i]);
	58	+ }
	59	+ return btoa(binary);
	60	+ }
	61	+
	62	+ static base64ToArrayBuffer(base64) {
	63	+ const binary = atob(base64);
	64	+ const buffer = new ArrayBuffer(binary.length);
	65	+ const bytes = new Uint8Array(buffer);
	66	+ for (let i = 0; i < binary.length; i++) {
	67	+ bytes[i] = binary.charCodeAt(i);
	68	+ }
	69	+ return buffer;
	70	+ }
	71	+
	72	+ static validateUrl(url) {
	73	+ if (typeof url !== 'string' || url.length === 0) {
	74	+ return null;
	75	+ }
	76	+
	77	+ if (url.length > CONFIG.MAX_URL_LENGTH) {
	78	+ console.error('URL exceeds maximum length');
	79	+ return null;
	80	+ }
	81	+
	82	+ try {
	83	+ const urlObj = new URL(url);
	84	+
	85	+ if (!CONFIG.ALLOWED_PROTOCOLS.includes(urlObj.protocol)) {
	86	+ console.error('Protocol not allowed:', urlObj.protocol);
	87	+ return null;
	88	+ }
	89	+
	90	+ if (urlObj.protocol === 'mailto:') {
	91	+ const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
	92	+ if (!emailRegex.test(urlObj.pathname)) {
	93	+ console.error('Invalid email format in mailto URL');
	94	+ return null;
	95	+ }
	96	+ }
	97	+
	98	+ return url;
	99	+ } catch (error) {
	100	+ console.error('Invalid URL format:', error.message);
	101	+ return null;
	102	+ }
	103	+ }
	104	+
	105	+ static escapeJavaScript(str) {
	106	+ if (typeof str !== 'string') {
	107	+ return '';
	108	+ }
	109	+ return str.replace(/\\/g, '\\\\')
	110	+ .replace(/'/g, "\\'")
	111	+ .replace(/"/g, '\\"')
	112	+ .replace(/\n/g, '\\n')
	113	+ .replace(/\r/g, '\\r')
	114	+ .replace(/\t/g, '\\t');
	115	+ }
15	116	}
16	117
17		-function DeCryptX( s )
18		-{
19		- location.href=DeCryptString( s );
20		-}
	118	+/**
	119	+ * Legacy encryption class - Fixed to match original PHP algorithm
	120	+ */
	121	+class LegacyEncryption {
	122	+ /**
	123	+ * Decrypts using the original CryptX algorithm (matches PHP version)
	124	+ * @param {string} encryptedString
	125	+ * @returns {string}
	126	+ */
	127	+ static originalDecrypt(encryptedString) {
	128	+ if (typeof encryptedString !== 'string' || encryptedString.length === 0) {
	129	+ throw new Error('Invalid encrypted string');
	130	+ }
	131	+
	132	+ // Constants from original algorithm
	133	+ const UPPER_LIMIT = 8364;
	134	+ const DEFAULT_VALUE = 128;
	135	+
	136	+ let charCode = 0;
	137	+ let decryptedString = "mailto:";
	138	+ let encryptionKey = 0;
	139	+
	140	+ try {
	141	+ for (let i = 0; i < encryptedString.length; i += 2) {
	142	+ if (i + 1 >= encryptedString.length) {
	143	+ break;
	144	+ }
	145	+
	146	+ // Get the salt (encryption key) from current position
	147	+ encryptionKey = parseInt(encryptedString.charAt(i), 10);
	148	+
	149	+ // Handle invalid salt values
	150	+ if (isNaN(encryptionKey)) {
	151	+ encryptionKey = 0;
	152	+ }
	153	+
	154	+ // Get the character code from next position
	155	+ charCode = encryptedString.charCodeAt(i + 1);
	156	+
	157	+ // Apply the same logic as original
	158	+ if (charCode >= UPPER_LIMIT) {
	159	+ charCode = DEFAULT_VALUE;
	160	+ }
	161	+
	162	+ // Decrypt by subtracting the salt
	163	+ const decryptedCharCode = charCode - encryptionKey;
	164	+
	165	+ // Validate the result
	166	+ if (decryptedCharCode < 0 || decryptedCharCode > 1114111) {
	167	+ throw new Error('Invalid character code during decryption');
	168	+ }
	169	+
	170	+ decryptedString += String.fromCharCode(decryptedCharCode);
	171	+ }
	172	+
	173	+ return decryptedString;
	174	+ } catch (error) {
	175	+ throw new Error('Original decryption failed: ' + error.message);
	176	+ }
	177	+ }
	178	+
	179	+ /**
	180	+ * Encrypts using the original CryptX algorithm (matches PHP version)
	181	+ * @param {string} inputString
	182	+ * @returns {string}
	183	+ */
	184	+ static originalEncrypt(inputString) {
	185	+ if (typeof inputString !== 'string' || inputString.length === 0) {
	186	+ throw new Error('Invalid input string');
	187	+ }
	188	+
	189	+ // Remove "mailto:" prefix if present for encryption
	190	+ const cleanInput = inputString.replace(/^mailto:/, '');
	191	+ let crypt = '';
	192	+
	193	+ // ASCII values blacklist (from PHP constant)
	194	+ const ASCII_VALUES_BLACKLIST = ['32', '34', '39', '60', '62', '63', '92', '94', '96', '127'];
	195	+
	196	+ try {
	197	+ for (let i = 0; i < cleanInput.length; i++) {
	198	+ let salt, asciiValue;
	199	+ let attempts = 0;
	200	+ const maxAttempts = 20; // Prevent infinite loops
	201	+
	202	+ do {
	203	+ if (attempts >= maxAttempts) {
	204	+ // Fallback to a safe salt if we can't find a valid one
	205	+ salt = 1;
	206	+ asciiValue = cleanInput.charCodeAt(i) + salt;
	207	+ break;
	208	+ }
	209	+
	210	+ // Generate random number between 0 and 3 (matching PHP rand(0,3))
	211	+ const randomValues = SecureUtils.getSecureRandomBytes(1);
	212	+ salt = randomValues[0] % 4;
	213	+
	214	+ // Get ASCII value and add salt
	215	+ asciiValue = cleanInput.charCodeAt(i) + salt;
	216	+
	217	+ // Check if value exceeds limit (matching PHP logic)
	218	+ if (asciiValue >= 8364) {
	219	+ asciiValue = 128;
	220	+ }
	221	+
	222	+ attempts++;
	223	+ } while (ASCII_VALUES_BLACKLIST.includes(asciiValue.toString()) && attempts < maxAttempts);
	224	+
	225	+ // Append salt and character to result
	226	+ crypt += salt.toString() + String.fromCharCode(asciiValue);
	227	+ }
	228	+
	229	+ return crypt;
	230	+ } catch (error) {
	231	+ throw new Error('Original encryption failed: ' + error.message);
	232	+ }
	233	+ }
	234	+}
	235	+
	236	+/**
	237	+ * Modern encryption class using Web Crypto API - PHP Compatible
	238	+ */
	239	+class SecureEncryption {
	240	+ /**
	241	+ * @param {string} password
	242	+ * @param {Uint8Array} salt
	243	+ * @param {number} [iterations] What the link itself says it was made with.
	244	+ * Left out only by links written before 4.2.0, which then fall back to
	245	+ * the configured value -- the behaviour that made changing the setting
	246	+ * kill every link already delivered.
	247	+ */
	248	+ static async deriveKey(password, salt, iterations) {
	249	+ // Clamped to the same ceiling PHP enforces. The value can only come
	250	+ // from the server today -- KSES lets neither class nor data-* through
	251	+ // for anyone without unfiltered_html, and anyone with it does not need
	252	+ // this route -- but a number that reaches PBKDF2 unchecked is worth one
	253	+ // line of arithmetic.
	254	+ const rounds = Number.isInteger(iterations) && iterations > 0
	255	+ ? Math.min(iterations, MAX_ROUNDS)
	256	+ : ITERATIONS;
	257	+ const encoder = new TextEncoder();
	258	+ const keyMaterial = await crypto.subtle.importKey(
	259	+ 'raw',
	260	+ encoder.encode(password),
	261	+ { name: 'PBKDF2' },
	262	+ false,
	263	+ ['deriveKey']
	264	+ );
	265	+
	266	+ return crypto.subtle.deriveKey(
	267	+ {
	268	+ name: 'PBKDF2',
	269	+ salt: salt,
	270	+ iterations: rounds,
	271	+ hash: 'SHA-256'
	272	+ },
	273	+ keyMaterial,
	274	+ { name: 'AES-GCM', length: KEY_LENGTH * 8},
	275	+ false,
	276	+ ['encrypt', 'decrypt']
	277	+ );
	278	+ }
	279	+
	280	+ static async encrypt(plaintext, password) {
	281	+ if (typeof plaintext !== 'string' || typeof password !== 'string') {
	282	+ throw new Error('Both plaintext and password must be strings');
	283	+ }
	284	+
	285	+ const encoder = new TextEncoder();
	286	+ const salt = SecureUtils.getSecureRandomBytes(16);
	287	+ const iv = SecureUtils.getSecureRandomBytes(CONFIG.IV_SIZE);
	288	+
	289	+ const key = await this.deriveKey(password, salt);
	290	+
	291	+ const encrypted = await crypto.subtle.encrypt(
	292	+ { name: 'AES-GCM', iv: iv },
	293	+ key,
	294	+ encoder.encode(plaintext)
	295	+ );
	296	+
	297	+ // Match PHP format: salt(16) + iv(16) + encrypted_data + tag(16)
	298	+ const encryptedArray = new Uint8Array(encrypted);
	299	+ const encryptedData = encryptedArray.slice(0, -16); // Remove tag from encrypted data
	300	+ const tag = encryptedArray.slice(-16); // Get the tag
	301	+
	302	+ const combined = new Uint8Array(salt.length + iv.length + encryptedData.length + tag.length);
	303	+ combined.set(salt, 0);
	304	+ combined.set(iv, salt.length);
	305	+ combined.set(encryptedData, salt.length + iv.length);
	306	+ combined.set(tag, salt.length + iv.length + encryptedData.length);
	307	+
	308	+ return SecureUtils.arrayBufferToBase64(combined.buffer);
	309	+ }
	310	+
	311	+ /**
	312	+ * @param {string} encryptedData
	313	+ * @param {string} password
	314	+ * @param {number} [iterations] See deriveKey().
	315	+ */
	316	+ static async decrypt(encryptedData, password, iterations) {
	317	+ if (typeof encryptedData !== 'string' || typeof password !== 'string') {
	318	+ throw new Error('Both encryptedData and password must be strings');
	319	+ }
	320	+
	321	+ try {
	322	+ const combined = SecureUtils.base64ToArrayBuffer(encryptedData);
	323	+ const totalLength = combined.byteLength;
	324	+
	325	+ // PHP format: salt(16) + iv(16) + encrypted_data + tag(16)
	326	+ const saltLength = 16;
	327	+ const ivLength = 16;
	328	+ const tagLength = 16;
	329	+ const encryptedDataLength = totalLength - saltLength - ivLength - tagLength;
	330	+
	331	+ if (totalLength < saltLength + ivLength + tagLength) {
	332	+ throw new Error('Encrypted data too short');
	333	+ }
	334	+
	335	+ const salt = combined.slice(0, saltLength);
	336	+ const iv = combined.slice(saltLength, saltLength + ivLength);
	337	+ const encryptedDataOnly = combined.slice(saltLength + ivLength, saltLength + ivLength + encryptedDataLength);
	338	+ const tag = combined.slice(-tagLength); // Last 16 bytes
	339	+
	340	+ const key = await this.deriveKey(password, new Uint8Array(salt), iterations);
	341	+
	342	+ // Reconstruct the encrypted data with tag for Web Crypto API
	343	+ const encryptedWithTag = new Uint8Array(encryptedDataOnly.byteLength + tag.byteLength);
	344	+ encryptedWithTag.set(new Uint8Array(encryptedDataOnly), 0);
	345	+ encryptedWithTag.set(new Uint8Array(tag), encryptedDataOnly.byteLength);
	346	+
	347	+ const decrypted = await crypto.subtle.decrypt(
	348	+ { name: 'AES-GCM', iv: new Uint8Array(iv) },
	349	+ key,
	350	+ encryptedWithTag
	351	+ );
	352	+
	353	+ const decoder = new TextDecoder();
	354	+ return decoder.decode(decrypted);
	355	+ } catch (error) {
	356	+ throw new Error('Decryption failed: ' + error.message);
	357	+ }
	358	+ }
	359	+}
	360	+
	361	+/**
	362	+ * Main CryptX functions with backward compatibility
	363	+ */
	364	+
	365	+/**
	366	+ * Securely decrypts and validates a URL before navigation
	367	+ * @param {string} encryptedUrl
	368	+ * @param {string} password
	369	+ */
	370	+async function secureDecryptAndNavigate(encryptedUrl, password = 'default_key', iterations) {
	371	+ if (typeof encryptedUrl !== 'string' || encryptedUrl.length === 0) {
	372	+ console.error('Invalid encrypted URL provided');
	373	+ return;
	374	+ }
	375	+
	376	+ try {
	377	+ let decryptedUrl;
	378	+
	379	+ // Try modern decryption first, then fall back to original algorithm
	380	+ try {
	381	+ decryptedUrl = await SecureEncryption.decrypt(encryptedUrl, password, iterations);
	382	+ } catch (modernError) {
	383	+ console.warn('Modern decryption failed, trying original algorithm');
	384	+ decryptedUrl = LegacyEncryption.originalDecrypt(encryptedUrl);
	385	+ }
	386	+
	387	+ const validatedUrl = SecureUtils.validateUrl(decryptedUrl);
	388	+ if (!validatedUrl) {
	389	+ console.error('Invalid or unsafe URL detected');
	390	+ return;
	391	+ }
	392	+
	393	+ window.location.href = validatedUrl;
	394	+
	395	+ } catch (error) {
	396	+ console.error('Error during URL decryption and navigation:', error.message);
	397	+ }
	398	+}
	399	+
	400	+/**
	401	+ * Legacy function for backward compatibility - using original algorithm
	402	+ * @param {string} encryptedString
	403	+ * @returns {string|null}
	404	+ */
	405	+function DeCryptString(encryptedString) {
	406	+ try {
	407	+ return LegacyEncryption.originalDecrypt(encryptedString);
	408	+ } catch (error) {
	409	+ console.error('Legacy decryption failed:', error.message);
	410	+ return null;
	411	+ }
	412	+}
	413	+
	414	+/**
	415	+ * Legacy function for backward compatibility - secured
	416	+ * @param {string} encryptedUrl
	417	+ */
	418	+function DeCryptX(encryptedUrl) {
	419	+ const decryptedUrl = DeCryptString(encryptedUrl);
	420	+ if (!decryptedUrl) {
	421	+ console.error('Failed to decrypt URL');
	422	+ return;
	423	+ }
	424	+
	425	+ const validatedUrl = SecureUtils.validateUrl(decryptedUrl);
	426	+ if (!validatedUrl) {
	427	+ console.error('Invalid or unsafe URL detected');
	428	+ return;
	429	+ }
	430	+
	431	+ window.location.href = validatedUrl;
	432	+}
	433	+
	434	+/**
	435	+ * Generates encrypted email link with proper security
	436	+ * @param {string} emailAddress
	437	+ * @param {string} password
	438	+ * @returns {Promise<string>}
	439	+ */
	440	+async function generateSecureEmailLink(emailAddress, password = 'default_key') {
	441	+ if (typeof emailAddress !== 'string' || emailAddress.length === 0) {
	442	+ throw new Error('Valid email address required');
	443	+ }
	444	+
	445	+ const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
	446	+ if (!emailRegex.test(emailAddress)) {
	447	+ throw new Error('Invalid email format');
	448	+ }
	449	+
	450	+ const mailtoUrl = `mailto:${emailAddress}`;
	451	+ const encryptedData = await SecureEncryption.encrypt(mailtoUrl, password);
	452	+ const escapedData = SecureUtils.escapeJavaScript(encryptedData);
	453	+
	454	+ // The iteration count goes in as well, for the same reason the PHP side
	455	+ // puts it in data-cxi: encrypt() used whatever ITERATIONS says right now,
	456	+ // and without recording that, a later change to the setting would leave
	457	+ // this link unopenable. Nothing in the plugin calls this function -- it is
	458	+ // here for anyone building links themselves -- which is exactly why it
	459	+ // should not be the one place that still breaks.
	460	+ return `javascript:secureDecryptAndNavigate('${escapedData}', '${SecureUtils.escapeJavaScript(password)}', ${ITERATIONS})`;
	461	+}
	462	+
	463	+/**
	464	+ * Legacy function for backward compatibility - using original algorithm
	465	+ * @param {string} emailAddress
	466	+ * @returns {string}
	467	+ */
	468	+function generateDeCryptXHandler(emailAddress) {
	469	+ if (typeof emailAddress !== 'string' || emailAddress.length === 0) {
	470	+ console.error('Valid email address required');
	471	+ return 'javascript:void(0)';
	472	+ }
	473	+
	474	+ try {
	475	+ const encrypted = LegacyEncryption.originalEncrypt(emailAddress);
	476	+ const escaped = SecureUtils.escapeJavaScript(encrypted);
	477	+ return `javascript:DeCryptX('${escaped}')`;
	478	+ } catch (error) {
	479	+ console.error('Error generating handler:', error.message);
	480	+ return 'javascript:void(0)';
	481	+ }
	482	+}
	483	+
	484	+/**
	485	+ * Legacy function - matches original PHP generateHashFromString
	486	+ * @param {string} inputString
	487	+ * @returns {string}
	488	+ */
	489	+function generateHashFromString(inputString) {
	490	+ try {
	491	+ return LegacyEncryption.originalEncrypt(inputString);
	492	+ } catch (error) {
	493	+ console.error('Error generating hash:', error.message);
	494	+ return '';
	495	+ }
	496	+}
	497	+
	498	+/**
	499	+ * CSP-safe link handling
	500	+ *
	501	+ * Markup produced by the PHP side (no javascript: URI, therefore no
	502	+ * 'unsafe-inline' needed in the Content-Security-Policy):
	503	+ *
	504	+ * <a href="#" class="cryptx-link" data-cx="BASE64" data-cxk="PASSWORD" data-cxm="secure" data-cxi="10000">…</a>
	505	+ * <a href="#" class="cryptx-link" data-cx="0i2p2h…" data-cxm="legacy">…</a>
	506	+ *
	507	+ * A single delegated listener on `document` covers links that are added later
	508	+ * (widgets, AJAX, block editor preview). The legacy javascript: entry points
	509	+ * above stay untouched for pages that were cached before this version.
	510	+ */
	511	+
	512	+const CRYPTX_LINK_CLASS = 'cryptx-link';
	513	+const CRYPTX_ATTR_PAYLOAD = 'data-cx';
	514	+const CRYPTX_ATTR_KEY = 'data-cxk';
	515	+const CRYPTX_ATTR_MODE = 'data-cxm';
	516	+const CRYPTX_ATTR_ITERATIONS = 'data-cxi';
	517	+const CRYPTX_MAX_DELEGATION_DEPTH = 50;
	518	+
	519	+/**
	520	+ * True only when the Web Crypto API is usable (secure context, modern browser)
	521	+ * @returns {boolean}
	522	+ */
	523	+function cryptxHasSubtleCrypto() {
	524	+ return typeof crypto !== 'undefined' &&
	525	+ !!crypto &&
	526	+ !!crypto.subtle &&
	527	+ typeof crypto.subtle.importKey === 'function';
	528	+}
	529	+
	530	+/**
	531	+ * @param {*} element
	532	+ * @returns {boolean}
	533	+ */
	534	+function isCryptxLink(element) {
	535	+ if (!element || typeof element.getAttribute !== 'function') {
	536	+ return false;
	537	+ }
	538	+
	539	+ if (element.classList && typeof element.classList.contains === 'function') {
	540	+ return element.classList.contains(CRYPTX_LINK_CLASS);
	541	+ }
	542	+
	543	+ if (typeof element.className === 'string') {
	544	+ return (' ' + element.className + ' ').indexOf(' ' + CRYPTX_LINK_CLASS + ' ') !== -1;
	545	+ }
	546	+
	547	+ return false;
	548	+}
	549	+
	550	+/**
	551	+ * Walks up from the event target to the CryptX link (clicks may land on a
	552	+ * child element, e.g. an <img> or <span> inside the anchor).
	553	+ * @param {*} startNode
	554	+ * @returns {*|null}
	555	+ */
	556	+function findCryptxLink(startNode) {
	557	+ let node = startNode;
	558	+ let depth = 0;
	559	+
	560	+ while (node && depth < CRYPTX_MAX_DELEGATION_DEPTH) {
	561	+ if (isCryptxLink(node)) {
	562	+ return node;
	563	+ }
	564	+ node = node.parentElement || node.parentNode || null;
	565	+ depth++;
	566	+ }
	567	+
	568	+ return null;
	569	+}
	570	+
	571	+/**
	572	+ * Decrypts a data-cx payload according to data-cxm.
	573	+ * Missing mode behaves like "secure" with a fallback to "legacy",
	574	+ * exactly like secureDecryptAndNavigate() does.
	575	+ * @param {string} payload
	576	+ * @param {string|null} password
	577	+ * @param {string|null} mode
	578	+ * @param {string|number|null} [iterations] What data-cxi says. Links written
	579	+ * before 4.2.0 do not carry it and fall back to the configured value -- which
	580	+ * is why changing that value used to break every link already delivered.
	581	+ * @returns {Promise<string>}
	582	+ */
	583	+async function cryptxDecryptPayload(payload, password, mode, iterations) {
	584	+ if (typeof payload !== 'string' || payload.length === 0) {
	585	+ throw new Error('Missing or invalid data-cx payload');
	586	+ }
	587	+
	588	+ const normalizedMode = typeof mode === 'string' ? mode.trim().toLowerCase() : '';
	589	+
	590	+ if (normalizedMode === 'legacy') {
	591	+ return LegacyEncryption.originalDecrypt(payload);
	592	+ }
	593	+
	594	+ if (!cryptxHasSubtleCrypto()) {
	595	+ if (normalizedMode === 'secure') {
	596	+ throw new Error('Web Crypto API (crypto.subtle) is not available in this context');
	597	+ }
	598	+ return LegacyEncryption.originalDecrypt(payload);
	599	+ }
	600	+
	601	+ const key = typeof password === 'string' && password.length > 0 ? password : 'default_key';
	602	+ const rounds = parseInt(iterations, 10);
	603	+
	604	+ try {
	605	+ return await SecureEncryption.decrypt(payload, key, rounds);
	606	+ } catch (secureError) {
	607	+ if (normalizedMode === 'secure') {
	608	+ throw secureError;
	609	+ }
	610	+ console.warn('CryptX: modern decryption failed, trying original algorithm');
	611	+ return LegacyEncryption.originalDecrypt(payload);
	612	+ }
	613	+}
	614	+
	615	+/**
	616	+ * Delegated click handler. Never navigates without SecureUtils.validateUrl().
	617	+ * @param {Object} event
	618	+ * @returns {Promise<void>}
	619	+ */
	620	+async function handleCryptxLinkClick(event) {
	621	+ if (!event) {
	622	+ return;
	623	+ }
	624	+
	625	+ const link = findCryptxLink(event.target);
	626	+ if (!link) {
	627	+ return;
	628	+ }
	629	+
	630	+ // Suppress the "#" jump before anything asynchronous happens.
	631	+ if (typeof event.preventDefault === 'function') {
	632	+ event.preventDefault();
	633	+ }
	634	+
	635	+ const payload = link.getAttribute(CRYPTX_ATTR_PAYLOAD);
	636	+ const password = link.getAttribute(CRYPTX_ATTR_KEY);
	637	+ const mode = link.getAttribute(CRYPTX_ATTR_MODE);
	638	+ const iterations = link.getAttribute(CRYPTX_ATTR_ITERATIONS);
	639	+
	640	+ try {
	641	+ const decryptedUrl = await cryptxDecryptPayload(payload, password, mode, iterations);
	642	+
	643	+ const validatedUrl = SecureUtils.validateUrl(decryptedUrl);
	644	+ if (!validatedUrl) {
	645	+ console.error('CryptX: invalid or unsafe URL detected, navigation aborted');
	646	+ return;
	647	+ }
	648	+
	649	+ window.location.href = validatedUrl;
	650	+ } catch (error) {
	651	+ console.error('CryptX: could not resolve link target:', error && error.message ? error.message : error);
	652	+ }
	653	+}
	654	+
	655	+/**
	656	+ * Attaches the single delegated listener. Idempotent.
	657	+ *
	658	+ * The "attached" flag lives on the document itself (an expando property),
	659	+ * not in a closure variable. Two things went wrong with a closure variable:
	660	+ * first, any plugin or loader that runs cryptx.js a second time on the same
	661	+ * document -- @swup/scripts-plugin does, Turbo/Hotwire does, any AJAX loader
	662	+ * that brings footer markup along does -- gets a fresh closure and therefore
	663	+ * a second `click` listener on `document`; measured: one click fired
	664	+ * `mailto:` twice. Second, initCryptxLinkHandler(otherDocument) is exported
	665	+ * for exactly this use but never worked, because the closure flag was
	666	+ * already true from the main document and nothing was attached to the one
	667	+ * passed in. Marking the document, not the module, fixes both with the same
	668	+ * few lines.
	669	+ * @param {Object} [targetDocument]
	670	+ * @returns {boolean} true when the listener was attached by this call
	671	+ */
	672	+function initCryptxLinkHandler(targetDocument) {
	673	+ const doc = targetDocument || (typeof document !== 'undefined' ? document : null);
	674	+
	675	+ if (!doc || typeof doc.addEventListener !== 'function') {
	676	+ return false;
	677	+ }
	678	+
	679	+ if (doc.__cryptxLinkHandlerAttached) {
	680	+ return false;
	681	+ }
	682	+
	683	+ doc.addEventListener('click', handleCryptxLinkClick, false);
	684	+ doc.__cryptxLinkHandlerAttached = true;
	685	+
	686	+ return true;
	687	+}
	688	+
	689	+// Attach immediately - delegation on `document` needs no finished DOM, so this
	690	+// works for a <head> include as well as for a footer include, where
	691	+// DOMContentLoaded may already have fired and would never come again.
	692	+if (typeof document !== 'undefined' && typeof document.addEventListener === 'function') {
	693	+ initCryptxLinkHandler(document);
	694	+
	695	+ if (document.readyState === 'loading') {
	696	+ // Safety net for exotic environments that replace `document` while parsing.
	697	+ document.addEventListener('DOMContentLoaded', function () {
	698	+ initCryptxLinkHandler(document);
	699	+ });
	700	+ }
	701	+}
	702	+
	703	+// Keep everything reachable by name, also after minification.
	704	+//
	705	+// The three the plugin itself depends on are secureDecryptAndNavigate and
	706	+// DeCryptX, which appear in the generated "javascript:" links, and
	707	+// generateDeCryptXHandler, which the help tab documents for use in a theme.
	708	+// The rest is kept because it has been exported for years; new code should use
	709	+// the window.CryptX namespace, and the bare names will go with the next major
	710	+// release, together with the deprecated encryptx().
	711	+if (typeof window !== 'undefined') {
	712	+ window.CryptX = {
	713	+ secureDecryptAndNavigate,
	714	+ DeCryptX,
	715	+ DeCryptString,
	716	+ generateSecureEmailLink,
	717	+ generateDeCryptXHandler,
	718	+ generateHashFromString,
	719	+ handleCryptxLinkClick,
	720	+ initCryptxLinkHandler,
	721	+ SecureUtils,
	722	+ LegacyEncryption,
	723	+ SecureEncryption
	724	+ };
	725	+
	726	+ window.secureDecryptAndNavigate = secureDecryptAndNavigate;
	727	+ window.DeCryptX = DeCryptX;
	728	+ window.DeCryptString = DeCryptString;
	729	+ window.generateSecureEmailLink = generateSecureEmailLink;
	730	+ window.generateDeCryptXHandler = generateDeCryptXHandler;
	731	+ window.generateHashFromString = generateHashFromString;
	732	+ window.handleCryptxLinkClick = handleCryptxLinkClick;
	733	+ window.initCryptxLinkHandler = initCryptxLinkHandler;
	734	+ window.SecureUtils = SecureUtils;
	735	+ window.LegacyEncryption = LegacyEncryption;
	736	+ window.SecureEncryption = SecureEncryption;
	737	+}
	738	+
	739	+// Export functions for module usage
	740	+if (typeof module !== 'undefined' && module.exports) {
	741	+ module.exports = {
	742	+ secureDecryptAndNavigate,
	743	+ generateSecureEmailLink,
	744	+ DeCryptX,
	745	+ DeCryptString,
	746	+ generateDeCryptXHandler,
	747	+ generateHashFromString,
	748	+ handleCryptxLinkClick,
	749	+ initCryptxLinkHandler,
	750	+ cryptxDecryptPayload,
	751	+ SecureEncryption,
	752	+ LegacyEncryption,
	753	+ SecureUtils
	754	+ };
	755	+}
	756	+})();