import { CryptoPlugin } from '@otplib/core';

/**
 * Node.js crypto module implementation of CryptoPlugin
 *
 * This plugin uses Node.js's built-in crypto module which provides:
 * - OpenSSL-backed HMAC operations
 * - Cryptographically secure random byte generation
 * - Synchronous API for optimal performance
 *
 * @example
 * ```ts
 * import { NodeCryptoPlugin } from '@otplib/plugin-crypto-node';
 *
 * const crypto = new NodeCryptoPlugin();
 * const hmac = await crypto.hmac('sha1', key, data);
 * const random = crypto.randomBytes(20);
 * ```
 */
declare class NodeCryptoPlugin implements CryptoPlugin {
    /**
     * Plugin name for identification
     */
    readonly name = "node";
    /**
     * Compute HMAC using Node.js crypto module
     *
     * Synchronous implementation using createHmac.
     *
     * @param algorithm - Hash algorithm to use
     * @param key - Secret key
     * @param data - Data to authenticate
     * @returns HMAC digest
     */
    hmac(algorithm: "sha1" | "sha256" | "sha512", key: Uint8Array, data: Uint8Array): Uint8Array;
    /**
     * Generate cryptographically secure random bytes
     *
     * Uses Node.js's randomBytes which is backed by OpenSSL.
     *
     * @param length - Number of bytes to generate
     * @returns Random bytes
     */
    randomBytes(length: number): Uint8Array;
    /**
     * Constant-time comparison using Node.js crypto.timingSafeEqual
     *
     * Uses Node.js's built-in timing-safe comparison which prevents
     * timing side-channel attacks.
     *
     * @param a - First value to compare
     * @param b - Second value to compare
     * @returns true if values are equal, false otherwise
     */
    constantTimeEqual(a: string | Uint8Array, b: string | Uint8Array): boolean;
}
/**
 * Default singleton instance for convenience
 *
 * @example
 * ```ts
 * import { crypto } from '@otplib/plugin-crypto-node';
 *
 * const hmac = crypto.hmac('sha1', key, data);
 * ```
 */
declare const crypto: CryptoPlugin;

export { NodeCryptoPlugin, crypto, NodeCryptoPlugin as default };