bitcoinjs-lib/src/templates/pubkeyhash/output.js

// OP_DUP OP_HASH160 {pubKeyHash} OP_EQUALVERIFY OP_CHECKSIG

const bscript = require('../../script')
const types = require('../../types')
const typeforce = require('typeforce')
const OPS = require('bitcoin-ops')

function check (script) {
  var buffer = bscript.compile(script)

  return buffer.length === 25 &&
    buffer[0] === OPS.OP_DUP &&
    buffer[1] === OPS.OP_HASH160 &&
    buffer[2] === 0x14 &&
    buffer[23] === OPS.OP_EQUALVERIFY &&
    buffer[24] === OPS.OP_CHECKSIG
}
check.toJSON = function () { return 'pubKeyHash output' }

function encode (pubKeyHash) {
  typeforce(types.Hash160bit, pubKeyHash)

  return bscript.compile([
    OPS.OP_DUP,
    OPS.OP_HASH160,
    pubKeyHash,
    OPS.OP_EQUALVERIFY,
    OPS.OP_CHECKSIG
  ])
}

function decode (buffer) {
  typeforce(check, buffer)

  return buffer.slice(3, 23)
}

module.exports = {
  check: check,
  decode: decode,
  encode: encode
}