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

A WebSockets library for interacting with WhatsApp Web

import { calculateMAC } from "libsignal/src/crypto.js";
import { SenderMessageKey } from "./sender-message-key.js";
export class SenderChainKey {
    constructor(iteration, chainKey) {
        this.MESSAGE_KEY_SEED = Buffer.from([0x01]);
        this.CHAIN_KEY_SEED = Buffer.from([0x02]);
        this.iteration = iteration;
        this.chainKey = Buffer.from(chainKey);
    }
    getIteration() {
        return this.iteration;
    }
    getSenderMessageKey() {
        return new SenderMessageKey(
            this.iteration,
            this.getDerivative(this.MESSAGE_KEY_SEED, this.chainKey)
        );
    }
    getNext() {
        return new SenderChainKey(
            this.iteration + 1,
            this.getDerivative(this.CHAIN_KEY_SEED, this.chainKey)
        );
    }
    getSeed() {
        return this.chainKey;
    }
    getDerivative(seed, key) {
        return calculateMAC(key, seed);
    }
}
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