@aptos-labs/ts-sdk/dist/internal/encryptionKey.js

Aptos TypeScript SDK

// Copyright © Aptos Foundation
// SPDX-License-Identifier: Apache-2.0
import { Hex } from "../core/hex.js";
import { Deserializer } from "../bcs/deserializer.js";
import { EncryptionKey } from "../core/crypto/encryption/index.js";
import { getLedgerInfo } from "./general.js";
const encryptionKeyCache = new Map();
/**
 * Fetches the encryption key from the fullnode index endpoint, deserializes it,
 * and caches it by fullnode URL (or network label) + epoch. Returns null if the node does not support
 * encrypted transactions.
 *
 * @param args.aptosConfig - Aptos configuration.
 */
export async function fetchAndCacheEncryptionKey(args) {
    const { aptosConfig } = args;
    const cacheKey = `encryption-key-${aptosConfig.fullnode ?? aptosConfig.network}`;
    const ledgerInfo = await getLedgerInfo({ aptosConfig });
    const cached = encryptionKeyCache.get(cacheKey);
    if (cached && cached.epoch === ledgerInfo.epoch) {
        return { key: cached.key, epoch: BigInt(cached.epoch) };
    }
    const hexKey = ledgerInfo.encryption_key;
    if (!hexKey) {
        return null;
    }
    const keyBytes = Hex.fromHexInput(hexKey).toUint8Array();
    const deserializer = new Deserializer(keyBytes);
    const key = EncryptionKey.deserialize(deserializer);
    encryptionKeyCache.set(cacheKey, { epoch: ledgerInfo.epoch, key });
    return { key, epoch: BigInt(ledgerInfo.epoch) };
}
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