/// <reference types="node" />
export interface Options {
    algorithm: string;
    key: string;
    iv: Buffer;
}
export declare function generateSalt(lengthBytes: number): string;
export declare function generateIV(lengthBytes: number): Buffer;
export declare class KeyDerivationOptions {
    password: string;
    salt: string;
    iterations: number;
    derivedKeyLength: number;
    digest: string;
    constructor(opts: {
        password: string;
        salt?: string;
        iterations?: number;
        derivedKeyLength?: number;
        digest?: string;
    });
}
export declare function deriveEncryptionKey(options: KeyDerivationOptions): string;
export declare function encryptUtf8(str: string, options: Options): string;
export declare function encryptUcs2(str: string, options: Options): string;
export declare function decryptUtf8(str: string, options: Options): string;
export declare function decryptUcs2(str: string, options: Options): string;