/// <reference types="node" />
export declare function md5(s: string | Buffer): string;
export declare function hash(s: string | Buffer, algorithm: string): string;
export declare function stringToBase64(s: string): string;
export declare function base64ToString(strBase64: string): string;
export declare function bufferToBase64(b: Buffer): string;
export declare function base64ToBuffer(strBase64: string): Buffer;