/**
 * Receives an exported CryptoKey string, creates a key,
 * and decrypts cipher text with the reconstructed key.
 *
 * @param key - The CryptoKey to export.
 * @returns A key string.
 */
async function exportKey(key) {
    const exportedKey = await window.crypto.subtle.exportKey(EXPORT_FORMAT, key);
    return JSON.stringify(exportedKey);
}```