80 lines
2.9 KiB
JavaScript
80 lines
2.9 KiB
JavaScript
const fs = require('fs');
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const crypto = require('crypto');
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const { getDb } = require('../db/database');
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const logger = require('./logger').child('ActivationBytes');
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const FIXED_KEY = Buffer.from([0x77, 0x21, 0x4d, 0x4b, 0x19, 0x6a, 0x87, 0xcd, 0x52, 0x00, 0x45, 0xfd, 0x20, 0xa5, 0x1d, 0x67]);
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const AAX_CHECKSUM_OFFSET = 653;
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const AAX_CHECKSUM_LENGTH = 20;
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function sha1(data) {
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return crypto.createHash('sha1').update(data).digest();
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}
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function verifyActivationBytes(activationBytesHex, expectedChecksumHex) {
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const bytes = Buffer.from(activationBytesHex, 'hex');
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const ik = sha1(Buffer.concat([FIXED_KEY, bytes]));
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const iv = sha1(Buffer.concat([FIXED_KEY, ik, bytes]));
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const checksum = sha1(Buffer.concat([ik.subarray(0, 16), iv.subarray(0, 16)]));
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return checksum.toString('hex') === expectedChecksumHex;
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}
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function readAaxChecksum(filePath) {
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const fd = fs.openSync(filePath, 'r');
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try {
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const buf = Buffer.alloc(AAX_CHECKSUM_LENGTH);
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const bytesRead = fs.readSync(fd, buf, 0, AAX_CHECKSUM_LENGTH, AAX_CHECKSUM_OFFSET);
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if (bytesRead !== AAX_CHECKSUM_LENGTH) {
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throw new Error(`Konnte Checksum nicht lesen (nur ${bytesRead} Bytes)`);
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}
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return buf.toString('hex');
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} finally {
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fs.closeSync(fd);
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}
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}
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async function lookupCached(checksum) {
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const db = await getDb();
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const row = await db.get('SELECT activation_bytes FROM aax_activation_bytes WHERE checksum = ?', checksum);
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return row ? row.activation_bytes : null;
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}
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async function saveActivationBytes(checksum, activationBytesHex) {
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const normalized = String(activationBytesHex || '').trim().toLowerCase();
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if (!/^[0-9a-f]{8}$/.test(normalized)) {
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throw new Error('Activation Bytes müssen genau 8 Hex-Zeichen (4 Bytes) sein');
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}
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if (!verifyActivationBytes(normalized, checksum)) {
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throw new Error('Activation Bytes passen nicht zur Checksum – bitte nochmals prüfen');
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}
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const db = await getDb();
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await db.run(
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'INSERT OR REPLACE INTO aax_activation_bytes (checksum, activation_bytes) VALUES (?, ?)',
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checksum,
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normalized
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);
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logger.info({ checksum, activationBytes: normalized }, 'Activation Bytes manuell gespeichert');
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return normalized;
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}
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async function resolveActivationBytes(filePath) {
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const checksum = readAaxChecksum(filePath);
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logger.info({ checksum }, 'AAX Checksum gelesen');
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const cached = await lookupCached(checksum);
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if (cached) {
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logger.info({ checksum }, 'Activation Bytes aus lokalem Cache');
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return { checksum, activationBytes: cached };
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}
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logger.info({ checksum }, 'Keine Activation Bytes im Cache – manuelle Eingabe erforderlich');
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return { checksum, activationBytes: null };
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}
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async function listCachedEntries() {
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const db = await getDb();
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return db.all('SELECT checksum, activation_bytes, created_at FROM aax_activation_bytes ORDER BY created_at DESC');
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}
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module.exports = { resolveActivationBytes, readAaxChecksum, saveActivationBytes, verifyActivationBytes, listCachedEntries };
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