bitcoinjs-lib/ts_src/crypto.ts

const createHash = require('create-hash')

export function ripemd160 (buffer: Buffer): Buffer {
  return createHash('rmd160').update(buffer).digest()
}

export function sha1 (buffer: Buffer): Buffer {
  return createHash('sha1').update(buffer).digest()
}

export function sha256 (buffer: Buffer): Buffer {
  return createHash('sha256').update(buffer).digest()
}

export function hash160 (buffer: Buffer): Buffer {
  return ripemd160(sha256(buffer))
}

export function hash256 (buffer: Buffer): Buffer {
  return sha256(sha256(buffer))
}