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));
}