@whiskeysockets/baileys
Version:
A WebSockets library for interacting with WhatsApp Web
52 lines (51 loc) • 1.75 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.LT_HASH_ANTI_TAMPERING = void 0;
const crypto_1 = require("./crypto");
/**
* LT Hash is a summation based hash algorithm that maintains the integrity of a piece of data
* over a series of mutations. You can add/remove mutations and it'll return a hash equal to
* if the same series of mutations was made sequentially.
*/
const o = 128;
class d {
constructor(e) {
this.salt = e;
}
add(e, t) {
var r = this;
for (const item of t) {
e = r._addSingle(e, item);
}
return e;
}
subtract(e, t) {
var r = this;
for (const item of t) {
e = r._subtractSingle(e, item);
}
return e;
}
subtractThenAdd(e, t, r) {
var n = this;
return n.add(n.subtract(e, r), t);
}
async _addSingle(e, t) {
var r = this;
const n = new Uint8Array(await (0, crypto_1.hkdf)(Buffer.from(t), o, { info: r.salt })).buffer;
return r.performPointwiseWithOverflow(await e, n, ((e, t) => e + t));
}
async _subtractSingle(e, t) {
var r = this;
const n = new Uint8Array(await (0, crypto_1.hkdf)(Buffer.from(t), o, { info: r.salt })).buffer;
return r.performPointwiseWithOverflow(await e, n, ((e, t) => e - t));
}
performPointwiseWithOverflow(e, t, r) {
const n = new DataView(e), i = new DataView(t), a = new ArrayBuffer(n.byteLength), s = new DataView(a);
for (let e = 0; e < n.byteLength; e += 2) {
s.setUint16(e, r(n.getUint16(e, !0), i.getUint16(e, !0)), !0);
}
return a;
}
}
exports.LT_HASH_ANTI_TAMPERING = new d('WhatsApp Patch Integrity');