/**
 * Secure Storage Interface
 * Platform-agnostic interface for secure key storage
 */
interface SecureStorageAdapter {
    /**
     * Store a value securely
     */
    setItem(key: string, value: string): Promise<void>;
    /**
     * Retrieve a value
     */
    getItem(key: string): Promise<string | null>;
    /**
     * Remove a value
     */
    removeItem(key: string): Promise<void>;
    /**
     * Check if a key exists
     */
    hasItem(key: string): Promise<boolean>;
    /**
     * Clear all stored values
     */
    clear(): Promise<void>;
}
/**
 * iOS Keychain Storage Adapter
 * Uses react-native-keychain for iOS Keychain access
 */
declare class KeychainStorageAdapter implements SecureStorageAdapter {
    private serviceName;
    constructor(serviceName?: string);
    setItem(key: string, value: string): Promise<void>;
    getItem(key: string): Promise<string | null>;
    removeItem(key: string): Promise<void>;
    hasItem(key: string): Promise<boolean>;
    clear(): Promise<void>;
}
/**
 * Android Keystore Storage Adapter
 * Uses Android Keystore for secure storage
 */
declare class KeystoreStorageAdapter implements SecureStorageAdapter {
    private alias;
    constructor(alias?: string);
    setItem(key: string, value: string): Promise<void>;
    getItem(key: string): Promise<string | null>;
    removeItem(key: string): Promise<void>;
    hasItem(key: string): Promise<boolean>;
    clear(): Promise<void>;
}
/**
 * Web Encrypted LocalStorage Adapter
 * Uses Web Crypto API for encryption with localStorage
 */
declare class WebEncryptedStorageAdapter implements SecureStorageAdapter {
    private encryptionKey;
    private storagePrefix;
    constructor(storagePrefix?: string);
    /**
     * Initialize with a password-derived key
     */
    initialize(password: string): Promise<void>;
    private getSalt;
    setItem(key: string, value: string): Promise<void>;
    getItem(key: string): Promise<string | null>;
    removeItem(key: string): Promise<void>;
    hasItem(key: string): Promise<boolean>;
    clear(): Promise<void>;
}
/**
 * In-Memory Storage Adapter (for testing)
 */
declare class MemoryStorageAdapter implements SecureStorageAdapter {
    private storage;
    setItem(key: string, value: string): Promise<void>;
    getItem(key: string): Promise<string | null>;
    removeItem(key: string): Promise<void>;
    hasItem(key: string): Promise<boolean>;
    clear(): Promise<void>;
}
/**
 * Secure Storage Factory
 * Creates appropriate storage adapter based on platform
 */
declare function createSecureStorage(): SecureStorageAdapter;

export { KeychainStorageAdapter as K, MemoryStorageAdapter as M, type SecureStorageAdapter as S, WebEncryptedStorageAdapter as W, KeystoreStorageAdapter as a, createSecureStorage as c };