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| (() => {
'use strict';
const cryptoObj = window.crypto || window.msCrypto;
const storage = window.localStorage;
const storageName = 'hexo-blog-encrypt:#' + window.location.pathname;
const keySalt = textToArray('hexo-blog-encrypt的作者们都是大帅比!');
const ivSalt = textToArray('hexo-blog-encrypt是地表最强Hexo加密插件!');
const knownPrefix = "<hbe-prefix></hbe-prefix>";
const mainElement = document.getElementById('hexo-blog-encrypt');
const wrongPassMessage = mainElement.dataset['wpm'];
const wrongHashMessage = mainElement.dataset['whm'];
const dataElement = mainElement.getElementsByTagName('script')['hbeData'];
const encryptedData = dataElement.innerText;
const HmacDigist = dataElement.dataset['hmacdigest'];
function hexToArray(s) {
return new Uint8Array(s.match(/[\da-f]{2}/gi).map((h => {
return parseInt(h, 16);
})));
}
function textToArray(s) {
var i = s.length;
var n = 0;
var ba = new Array()
for (var j = 0; j < i;) {
var c = s.codePointAt(j);
if (c < 128) {
ba[n++] = c;
j++;
} else if ((c > 127) && (c < 2048)) {
ba[n++] = (c >> 6) | 192;
ba[n++] = (c & 63) | 128;
j++;
} else if ((c > 2047) && (c < 65536)) {
ba[n++] = (c >> 12) | 224;
ba[n++] = ((c >> 6) & 63) | 128;
ba[n++] = (c & 63) | 128;
j++;
} else {
ba[n++] = (c >> 18) | 240;
ba[n++] = ((c >> 12) & 63) | 128;
ba[n++] = ((c >> 6) & 63) | 128;
ba[n++] = (c & 63) | 128;
j += 2;
}
}
return new Uint8Array(ba);
}
function arrayBufferToHex(arrayBuffer) {
if (typeof arrayBuffer !== 'object' || arrayBuffer === null || typeof arrayBuffer.byteLength !== 'number') {
throw new TypeError('Expected input to be an ArrayBuffer')
}
var view = new Uint8Array(arrayBuffer)
var result = ''
var value
for (var i = 0; i < view.length; i++) {
value = view[i].toString(16)
result += (value.length === 1 ? '0' + value : value)
}
return result
}
async function getExecutableScript(oldElem) {
let out = document.createElement('script');
const attList = ['type', 'text', 'src', 'crossorigin', 'defer', 'referrerpolicy'];
attList.forEach((att) => {
if (oldElem[att])
out[att] = oldElem[att];
})
return out;
}
async function convertHTMLToElement(content) {
let out = document.createElement('div');
out.innerHTML = content;
out.querySelectorAll('script').forEach(async (elem) => {
elem.replaceWith(await getExecutableScript(elem));
});
return out;
}
function getKeyMaterial(password) {
let encoder = new TextEncoder();
return cryptoObj.subtle.importKey(
'raw',
encoder.encode(password),
{
'name': 'PBKDF2',
},
false,
[
'deriveKey',
'deriveBits',
]
);
}
function getHmacKey(keyMaterial) {
return cryptoObj.subtle.deriveKey({
'name': 'PBKDF2',
'hash': 'SHA-256',
'salt': keySalt.buffer,
'iterations': 1024
}, keyMaterial, {
'name': 'HMAC',
'hash': 'SHA-256',
'length': 256,
}, true, [
'verify',
]);
}
function getDecryptKey(keyMaterial) {
return cryptoObj.subtle.deriveKey({
'name': 'PBKDF2',
'hash': 'SHA-256',
'salt': keySalt.buffer,
'iterations': 1024,
}, keyMaterial, {
'name': 'AES-CBC',
'length': 256,
}, true, [
'decrypt',
]);
}
function getIv(keyMaterial) {
return cryptoObj.subtle.deriveBits({
'name': 'PBKDF2',
'hash': 'SHA-256',
'salt': ivSalt.buffer,
'iterations': 512,
}, keyMaterial, 16 * 8);
}
async function verifyContent(key, content) {
const encoder = new TextEncoder();
const encoded = encoder.encode(content);
let signature = hexToArray(HmacDigist);
const result = await cryptoObj.subtle.verify({
'name': 'HMAC',
'hash': 'SHA-256',
}, key, signature, encoded);
console.log(`Verification result: ${result}`);
if (!result) {
alert(wrongHashMessage);
console.log(`${wrongHashMessage}, got `, signature, ` but proved wrong.`);
}
return result;
}
async function decrypt(decryptKey, iv, hmacKey) {
let typedArray = hexToArray(encryptedData);
const result = await cryptoObj.subtle.decrypt({
'name': 'AES-CBC',
'iv': iv,
}, decryptKey, typedArray.buffer).then(async (result) => {
const decoder = new TextDecoder();
const decoded = decoder.decode(result);
if (!decoded.startsWith(knownPrefix)) {
throw "Decode successfully but not start with KnownPrefix.";
}
const hideButton = document.createElement('button');
hideButton.textContent = 'Encrypt again';
hideButton.type = 'button';
hideButton.classList.add("hbe-button");
hideButton.addEventListener('click', () => {
window.localStorage.removeItem(storageName);
window.location.reload();
});
document.getElementById('hexo-blog-encrypt').style.display = 'inline';
document.getElementById('hexo-blog-encrypt').innerHTML = '';
document.getElementById('hexo-blog-encrypt').appendChild(await convertHTMLToElement(decoded));
document.getElementById('hexo-blog-encrypt').appendChild(hideButton);
document.querySelectorAll('img').forEach((elem) => {
if (elem.getAttribute("data-src") && !elem.src) {
elem.src = elem.getAttribute('data-src');
}
});
window.NexT && NexT.boot && typeof NexT.boot.refresh === 'function' && NexT.boot.refresh();
var tocDiv = document.getElementById("toc-div");
if (tocDiv) {
tocDiv.style.display = 'inline';
}
var tocDivs = document.getElementsByClassName('toc-div-class');
if (tocDivs && tocDivs.length > 0) {
for (var idx = 0; idx < tocDivs.length; idx++) {
tocDivs[idx].style.display = 'inline';
}
}
var event = new Event('hexo-blog-decrypt');
window.dispatchEvent(event);
return await verifyContent(hmacKey, decoded);
}).catch((e) => {
alert(wrongPassMessage);
console.log(e);
return false;
});
return result;
}
function hbeLoader() {
const oldStorageData = JSON.parse(storage.getItem(storageName));
if (oldStorageData) {
console.log(`Password got from localStorage(${storageName}): `, oldStorageData);
const sIv = hexToArray(oldStorageData.iv).buffer;
const sDk = oldStorageData.dk;
const sHmk = oldStorageData.hmk;
cryptoObj.subtle.importKey('jwk', sDk, {
'name': 'AES-CBC',
'length': 256,
}, true, [
'decrypt',
]).then((dkCK) => {
cryptoObj.subtle.importKey('jwk', sHmk, {
'name': 'HMAC',
'hash': 'SHA-256',
'length': 256,
}, true, [
'verify',
]).then((hmkCK) => {
decrypt(dkCK, sIv, hmkCK).then((result) => {
if (!result) {
storage.removeItem(storageName);
}
});
});
});
}
mainElement.addEventListener('keydown', async (event) => {
if (!event.isComposing && event.keyCode === 13) {
const password = document.getElementById('hbePass').value;
const keyMaterial = await getKeyMaterial(password);
const hmacKey = await getHmacKey(keyMaterial);
const decryptKey = await getDecryptKey(keyMaterial);
const iv = await getIv(keyMaterial);
decrypt(decryptKey, iv, hmacKey).then((result) => {
console.log(`Decrypt result: ${result}`);
if (result) {
cryptoObj.subtle.exportKey('jwk', decryptKey).then((dk) => {
cryptoObj.subtle.exportKey('jwk', hmacKey).then((hmk) => {
const newStorageData = {
'dk': dk,
'iv': arrayBufferToHex(iv),
'hmk': hmk,
};
storage.setItem(storageName, JSON.stringify(newStorageData));
});
});
}
});
}
});
const confirmButton = document.getElementById('hbeConfirmBtn');
confirmButton.addEventListener('click', async () => {
const password = document.getElementById('hbePass').value;
try {
const keyMaterial = await getKeyMaterial(password);
const hmacKey = await getHmacKey(keyMaterial);
const decryptKey = await getDecryptKey(keyMaterial);
const iv = await getIv(keyMaterial);
const result = await decrypt(decryptKey, iv, hmacKey);
console.log(`Decrypt result: ${result}`);
if (result) {
const dk = await cryptoObj.subtle.exportKey('jwk', decryptKey);
const hmk = await cryptoObj.subtle.exportKey('jwk', hmacKey);
const newStorageData = {
'dk': dk,
'iv': arrayBufferToHex(iv),
'hmk': hmk,
};
storage.setItem(storageName, JSON.stringify(newStorageData));
}
} catch (error) {
console.error('Error during decryption process:', error);
}
});
}
hbeLoader();
})();
|
