/**
 * PGP Key Storage
 *
 * IndexedDB-based storage for encrypted PGP private keys.
 * The encrypted private key is stored locally on the device and never sent to servers.
 *
 * Issue #1374
 */
import type { PGPKeyStorage, StoredPGPPrivateKey } from "./types";
/**
 * Generate storage key for a user's PGP private key
 */
export declare function getStorageKey(userId: string): string;
/**
 * Store an encrypted PGP private key in IndexedDB
 *
 * @param record - The encrypted private key record to store
 */
export declare function storePGPPrivateKey(record: StoredPGPPrivateKey): Promise<void>;
/**
 * Retrieve an encrypted PGP private key from IndexedDB
 *
 * @param userId - User's Cognito sub
 * @returns The encrypted private key record or null if not found
 */
export declare function getPGPPrivateKey(userId: string): Promise<StoredPGPPrivateKey | null>;
/**
 * Delete an encrypted PGP private key from IndexedDB
 *
 * @param userId - User's Cognito sub
 */
export declare function deletePGPPrivateKey(userId: string): Promise<void>;
/**
 * Check if an encrypted PGP private key exists for a user
 *
 * @param userId - User's Cognito sub
 * @returns true if a key exists
 */
export declare function hasPGPPrivateKey(userId: string): Promise<boolean>;
/**
 * Create a PGPKeyStorage implementation using IndexedDB
 */
export declare function createIndexedDBPGPKeyStorage(): PGPKeyStorage;