naruyaizumi/lib/Signal/Group/sender-message-key.js

A WebSockets library for interacting with WhatsApp Web

import { deriveSecrets } from "libsignal/src/crypto.js";
export class SenderMessageKey {
    constructor(iteration, seed) {
        const derivative = deriveSecrets(seed, Buffer.alloc(32), Buffer.from("WhisperGroup"));
        const keys = new Uint8Array(32);
        keys.set(new Uint8Array(derivative[0].slice(16)));
        keys.set(new Uint8Array(derivative[1].slice(0, 16)), 16);
        this.iv = Buffer.from(derivative[0].slice(0, 16));
        this.cipherKey = Buffer.from(keys.buffer);
        this.iteration = iteration;
        this.seed = seed;
    }
    getIteration() {
        return this.iteration;
    }
    getIv() {
        return this.iv;
    }
    getCipherKey() {
        return this.cipherKey;
    }
    getSeed() {
        return this.seed;
    }
}
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