neroxbailx/lib/Utils/lt-hash.js

baileys whatsapp-api

"use strict"
Object.defineProperty(exports, "__esModule", { value: true })
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 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 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
}
}
const LT_HASH_ANTI_TAMPERING = new d('WhatsApp Patch Integrity')
module.exports = {
LT_HASH_ANTI_TAMPERING
}