export declare const PASSWORD_ITERATIONS = 600000;
/**
 * Options for password verification.
 *
 * @export
 */
export interface VerifyPasswordOptions {
    /**
     * Callback function called with a new hash when the password security needs to be upgraded.
     */
    onPasswordUpgrade?: (newHash: string) => Promise<void> | void;
}
/**
 * Service for password hashing and verification.
 *
 * @export
 */
export declare class PasswordService {
    /**
     * Hash a password using the PBKDF2 algorithm.
     *
     * Configured to use PBKDF2 + HMAC + SHA256.
     * The result is a 64 byte binary string.
     *
     * The random salt is 16 bytes long.
     * The number of iterations is 600,000.
     * The length key is 32 bytes long.
     *
     * @param {string} plainTextPassword - The password to hash.
     * @returns {Promise<string>} The derived key with the algorithm name, the number of iterations and the salt.
     */
    hashPassword(plainTextPassword: string): Promise<string>;
    /**
     * Compare a plain text password and a hash to see if they match.
     *
     * @param {string} plainTextPassword - The password in clear text.
     * @param {string} passwordHash - The password hash generated by the `hashPassword` method.
     * @param {VerifyPasswordOptions} [options] - Optional configuration object.
     * @returns {Promise<boolean>} True if the hash and the password match. False otherwise.
     */
    verifyPassword(plainTextPassword: string, passwordHash: string, options?: VerifyPasswordOptions): Promise<boolean>;
    /**
     * Check if a password hash needs to be refreshed.
     *
     * @param {string} passwordHash - The password hash to check.
     * @returns {boolean} True if the password hash needs to be refreshed. False otherwise.
     */
    passwordHashNeedsToBeRefreshed(passwordHash: string): boolean;
}