131 lines
3.8 KiB
JavaScript
131 lines
3.8 KiB
JavaScript
const fs = require("fs");
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const path = require("path");
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const aescfb = require('./aes');
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const skinKey = "s5s5ejuDru4uchuF2drUFuthaspAbepE";
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const localStatePath = path.join(process.env.LocalAppData, "/Packages/Microsoft.MinecraftUWP_8wekyb3d8bbwe/LocalState");
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const mcpePath = path.join(localStatePath, "/games/com.mojang/minecraftpe");
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const keyDb = {};
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getEntFile();
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function getTitleAccountId() {
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const optionsTxt = path.join(mcpePath, 'options.txt');
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if(fs.existsSync(optionsTxt)) {
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const options = fs.readFileSync(optionsTxt).toString();
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const lines = options.split('\n');
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for (let i = 0; i < lines.length; i++) {
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const [key, value] = lines[i].split(':');
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if (key === "last_title_account_id") {
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return value.replace("\n", "").replace("\r", "");
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}
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}
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}
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}
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function getEntKey() {
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const titleAccountId = getTitleAccountId();
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const entXorKey = "X(nG*ejm&E8)m+8c;-SkLTjF)*QdN6_Y";
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const entKey = Buffer.alloc(32);
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for (let i = 0; i < 32; i++) {
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entKey[i] = titleAccountId.charCodeAt(i % titleAccountId.length) ^ entXorKey.charCodeAt(i);
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}
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return entKey;
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}
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function lookupKey(uuid) {
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return keyDb[uuid] || skinKey;
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}
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function getEntFile() {
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if(fs.existsSync(localStatePath)) {
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const files = fs.readdirSync(localStatePath);
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const entFileNames = files.filter(file => file.endsWith(".ent"));
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const entFiles = entFileNames.map(file => fs.readFileSync(path.join(localStatePath, file)).toString().substring("Version2".length));
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for (let index = 0; index < entFiles.length; index++) {
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const entFile = entFiles[index];
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const cipherText = Buffer.from(entFile, 'base64')
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const decrypted = decryptBuffer(cipherText, getEntKey());
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try {
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const json = JSON.parse(decrypted.toString());
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parseEnt(json)
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} catch {
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continue;
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}
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}
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}
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}
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module.exports = lookupKey;
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function parseEnt(ent) {
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const mainReceipt = ent.Receipt;
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parseReceipt(mainReceipt)
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for (let index = 0; index < ent.Items.length; index++) {
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const item = ent.Items[index];
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const receipt = item.Receipt;
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parseReceipt(receipt);
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}
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}
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function parseReceipt(receipt) {
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const receiptContent = receipt.split(".")[1];
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const content = JSON.parse(atob(receiptContent));
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const entitlements = content.Receipt.Entitlements;
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const deviceId = content.Receipt.ReceiptData?.DeviceId;
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const entityId = content.Receipt.EntityId;
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if (!deviceId || !entityId) return;
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const userKey = deriveUserKey(deviceId, entityId);
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for (let index = 0; index < entitlements.length; index++) {
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const element = entitlements[index];
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if (!element.ContentKey) continue;
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keyDb[element.FriendlyId] = deobfuscateContentKey(element.ContentKey, userKey);
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}
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}
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function deriveUserKey(deviceId, entityId) {
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const deviceIdBuffer = Buffer.from(deviceId, 'utf16le');
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const entityIdBuffer = Buffer.from(entityId, 'utf16le');
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let length = deviceIdBuffer.length;
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if (entityIdBuffer.length < length) length = entityIdBuffer.length;
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const userKey = Buffer.alloc(length);
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for (let index = 0; index < userKey.length; index++) {
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userKey[index] = deviceIdBuffer[index] ^ entityIdBuffer[index];
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}
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return userKey;
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}
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function deobfuscateContentKey(contentKey, userKey) {
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const b64DecodedKey = Buffer.from(contentKey, 'base64');
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let length = b64DecodedKey.length;
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if (userKey.length < length) length = userKey.length;
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const deobfuscatedKey = Buffer.alloc(length);
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for (let index = 0; index < deobfuscatedKey.length; index++) {
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deobfuscatedKey[index] = b64DecodedKey[index] ^ userKey[index];
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}
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return deobfuscatedKey.toString("utf16le");
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}
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function decryptBuffer(buffer, key) {
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const bufferKey = Buffer.from(key, 'binary');
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return aescfb(buffer, bufferKey);
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} |