/**
 * This Source Code is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * Copyright (c) Infonomic Company Limited
 */
/**
 * PHC (Password Hashing Competition) string format encode / decode for argon2id.
 *
 * Format:
 *   $argon2id$v=<ver>$m=<mem>,t=<iter>,p=<para>$<saltB64>$<hashB64>
 *
 * Where `saltB64` and `hashB64` use the PHC "B64" alphabet — standard base64
 * without trailing `=` padding. Matches the wire format produced by
 * `@node-rs/argon2` and `argon2-cffi`, so existing password column rows keep
 * verifying after the cutover.
 *
 * Implemented against the Web-standard `btoa` / `atob` (available in Node ≥ 16,
 * browsers, Workers, Deno, Bun) so this module has no Node-specific surface.
 */
export type Argon2idPhc = {
    /** Always `'argon2id'` for this codebase. */
    algorithm: 'argon2id';
    /** Argon2 version number — `0x13` (decimal 19) since RFC 9106. */
    version: number;
    /** Memory cost in KiB. */
    memoryCost: number;
    /** Iterations. */
    timeCost: number;
    /** Parallelism (lanes). */
    parallelism: number;
    /** Raw salt bytes. */
    salt: Uint8Array;
    /** Raw derived-key bytes. */
    hash: Uint8Array;
};
export declare function encodeArgon2idPhc(phc: Argon2idPhc): string;
export declare function decodeArgon2idPhc(s: string): Argon2idPhc;
/**
 * Constant-time byte comparison. Returns `true` only if both arrays have the
 * same length and every byte matches. Intended for hash verification.
 */
export declare function timingSafeEqual(a: Uint8Array, b: Uint8Array): boolean;