@openclaw-cn/libsignal

--- package/src/session_record.js (excerpt) ---
// vim: ts=4:sw=4

const BaseKeyType = require('./base_key_type');

const CLOSED_SESSIONS_MAX = 40;
const SESSION_RECORD_VERSION = 'v1';

function assertBuffer(value) {
    if (!Buffer.isBuffer(value)) {
        throw new TypeError("Buffer required");
    }
}


class SessionEntry {

    constructor() {
        this._chains = {};
    }

    toString() {
        const baseKey = this.indexInfo && this.indexInfo.baseKey &&
            this.indexInfo.baseKey.toString('base64');
        return `<SessionEntry [baseKey=${baseKey}]>`;
    }

    inspect() {
        return this.toString();
    }

    addChain(key, value) {
        assertBuffer(key);
        const id = key.toString('base64');
        if (this._chains.hasOwnProperty(id)) {
            throw new Error("Overwrite attempt");
        }
        this._chains[id] = value;
    }

    getChain(key) {
        assertBuffer(key);
        return this._chains[key.toString('base64')];
    }

    deleteChain(key) {
        assertBuffer(key);
        const id = key.toString('base64');
        if (!this._chains.hasOwnProperty(id)) {
            throw new ReferenceError("Not Found");
        }
        delete this._chains[id];
    }

    *chains() {
        for (const [k, v] of Object.entries(this._chains)) {
            yield [Buffer.from(k, 'base64'), v];
        }
    }

    serialize() {
        const data = {
            registrationId: this.registrationId,
            currentRatchet: {
                ephemeralKeyPair: {