oicq
Version:
QQ protocol!
104 lines (103 loc) • 3.25 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.decrypt = exports.encrypt = void 0;
const BUF7 = Buffer.alloc(7);
const deltas = [
0x9e3779b9,
0x3c6ef372,
0xdaa66d2b,
0x78dde6e4,
0x1715609d,
0xb54cda56,
0x5384540f,
0xf1bbcdc8,
0x8ff34781,
0x2e2ac13a,
0xcc623af3,
0x6a99b4ac,
0x08d12e65,
0xa708a81e,
0x454021d7,
0xe3779b90,
];
function _toUInt32(num) {
return num >>> 0;
}
function _encrypt(x, y, k0, k1, k2, k3) {
for (let i = 0; i < 16; ++i) {
let aa = (_toUInt32((y << 4 >>> 0) + k0) ^ _toUInt32(y + deltas[i])) >>> 0 ^ _toUInt32(~~(y / 32) + k1);
aa >>>= 0;
x = _toUInt32(x + aa);
let bb = (_toUInt32((x << 4 >>> 0) + k2) ^ _toUInt32(x + deltas[i])) >>> 0 ^ _toUInt32(~~(x / 32) + k3);
bb >>>= 0;
y = _toUInt32(y + bb);
}
return [x, y];
}
function encrypt(data, key) {
let n = 6 - data.length >>> 0;
n = n % 8 + 2;
const v = Buffer.concat([
Buffer.from([(n - 2) | 0xF8]),
Buffer.allocUnsafe(n),
data,
BUF7,
]);
const k0 = key.readUInt32BE(0);
const k1 = key.readUInt32BE(4);
const k2 = key.readUInt32BE(8);
const k3 = key.readUInt32BE(12);
let r1 = 0, r2 = 0, t1 = 0, t2 = 0;
for (let i = 0; i < v.length; i += 8) {
const a1 = v.readUInt32BE(i);
const a2 = v.readUInt32BE(i + 4);
const b1 = a1 ^ r1;
const b2 = a2 ^ r2;
const [x, y] = _encrypt(b1 >>> 0, b2 >>> 0, k0, k1, k2, k3);
r1 = x ^ t1;
r2 = y ^ t2;
t1 = b1;
t2 = b2;
v.writeInt32BE(r1, i);
v.writeInt32BE(r2, i + 4);
}
return v;
}
exports.encrypt = encrypt;
function _decrypt(x, y, k0, k1, k2, k3) {
for (let i = 15; i >= 0; --i) {
let aa = (_toUInt32((x << 4 >>> 0) + k2) ^ _toUInt32(x + deltas[i])) >>> 0 ^ _toUInt32(~~(x / 32) + k3);
y = y - aa >>> 0;
let bb = (_toUInt32((y << 4 >>> 0) + k0) ^ _toUInt32(y + deltas[i])) >>> 0 ^ _toUInt32(~~(y / 32) + k1);
x = x - bb >>> 0;
}
return [x, y];
}
function decrypt(encrypted, key) {
if (encrypted.length % 8)
throw ERROR_ENCRYPTED_LENGTH;
const k0 = key.readUInt32BE(0);
const k1 = key.readUInt32BE(4);
const k2 = key.readUInt32BE(8);
const k3 = key.readUInt32BE(12);
let r1 = 0, r2 = 0, t1 = 0, t2 = 0, x = 0, y = 0;
for (let i = 0; i < encrypted.length; i += 8) {
const a1 = encrypted.readUInt32BE(i);
const a2 = encrypted.readUInt32BE(i + 4);
const b1 = a1 ^ x;
const b2 = a2 ^ y;
[x, y] = _decrypt(b1 >>> 0, b2 >>> 0, k0, k1, k2, k3);
r1 = x ^ t1;
r2 = y ^ t2;
t1 = a1;
t2 = a2;
encrypted.writeInt32BE(r1, i);
encrypted.writeInt32BE(r2, i + 4);
}
if (Buffer.compare(encrypted.slice(encrypted.length - 7), BUF7) !== 0)
throw ERROR_ENCRYPTED_ILLEGAL;
return encrypted.slice((encrypted[0] & 0x07) + 3, encrypted.length - 7);
}
exports.decrypt = decrypt;
const ERROR_ENCRYPTED_LENGTH = new Error("length of encrypted data must be a multiple of 8");
const ERROR_ENCRYPTED_ILLEGAL = new Error("encrypted data is illegal");