declare module 'ethereumjs-util' {
  import { Buffer } from 'safe-buffer'
  import BN = require('bn.js')

  interface Signature {
    v: number,
    r: Buffer,
    s: Buffer
  }

  export const MAX_INTEGER: BN

  export const TWO_POW256: BN

  export const SHA3_NULL_S: string

  export const SHA3_NULL: Buffer

  export const SHA3_RLP_ARRAY_S: string

  export const SHA3_RLP_ARRAY: Buffer

  export const SHA3_RLP_S: string

  export const SHA3_RLP: Buffer

  export function zeros (bytes: number): Buffer

  export function setLength (msg: Buffer, length: number, right: boolean): Buffer
  export function setLength (msg: number[], length: number, right: boolean): number[]

  export function setLengthLeft (msg: Buffer, length: number, right?: boolean): Buffer
  export function setLengthLeft (msg: number[], length: number, right?: boolean): number[]

  export function setLengthRight (msg: Buffer, length: number): Buffer
  export function setLengthRight (msg: number[], length: number): number[]

  export function unpad (a: Buffer): Buffer
  export function unpad (a: number[]): number[]
  export function unpad (a: string): string

  export function toBuffer (v: any): Buffer

  export function bufferToInt (buf: Buffer): number

  export function bufferToHex (buf: Buffer): string

  export function fromSigned (num: Buffer): BN

  export function toUnsigned (num: BN): Buffer

  export function sha3 (a: Buffer|string|number|number[], bits?: number): Buffer

  export function sha256 (a: Buffer|string|number|number[]): Buffer

  export function ripemd160 (a: Buffer|string|number|number[], padded?: boolean): Buffer

  export function rlphash (a: Buffer|string|number|number[]): Buffer

  export function isValidPrivate(privateKey: Buffer): boolean

  export function isValidPublic(publicKey: Buffer, sanitize?: boolean): boolean

  export function pubToAddress (publicKey: Buffer, sanitize?: boolean): Buffer
  export function publicToAddress (publicKey: Buffer, sanitize?: boolean): Buffer

  export function privateToPublic (privateKey: Buffer): Buffer

  export function importPublic (publicKey: Buffer): Buffer

  export function ecsign (message: Buffer, privateKey: Buffer): Signature

  export function hashPersonalMessage (message: Buffer|string): Buffer

  export function ecrecover (msgHash: Buffer, v: number, r: Buffer, s: Buffer): Buffer

  export function toRpcSig (v: number, r: Buffer, s: Buffer): string

  export function fromRpcSig (sig: string): Signature

  export function privateToAddress (privateKey: Buffer): Buffer

  export function isValidAddress (address: string): boolean

  export function toChecksumAddress (address: string): string

  export function isValidChecksumAddress (address: string): boolean

  export function generateAddress (from: Buffer|string, nonce: number|string|number[]|Buffer): Buffer

  export function isPrecompiled (address: Buffer|string): boolean

  export function addHexPrefix (str: string): string

  export function stripHexPrefix (str: string): string

  export function isValidSignature (v: number, r: Buffer|string, s: Buffer|string, homestead?: boolean): boolean

  export function baToJSON (ba: Buffer): string
  export function baToJSON (ba: any[]): string[]
}