crypto.ts

const createHash = require('create-hash');
const createHmac = require('create-hmac');

export function hash160(buffer: Buffer): Buffer {
  const sha256Hash: Buffer = createHash('sha256')
    .update(buffer)
    .digest();
  try {
    return createHash('rmd160')
      .update(sha256Hash)
      .digest();
  } catch (err) {
    return createHash('ripemd160')
      .update(sha256Hash)
      .digest();
  }
}

export function hmacSHA512(key: Buffer, data: Buffer): Buffer {
  return createHmac('sha512', key)
    .update(data)
    .digest();
}