bitcoinjs-lib/src/ecpubkey.js

var crypto = require('./crypto')
var ecdsa = require('./ecdsa')
var typeForce = require('typeforce')
var networks = require('./networks')

var Address = require('./address')

var ecurve = require('ecurve')
var secp256k1 = ecurve.getCurveByName('secp256k1')

function ECPubKey(Q, compressed) {
  if (compressed === undefined) compressed = true

  typeForce('Point', Q)
  typeForce('Boolean', compressed)

  this.compressed = compressed
  this.Q = Q
}

// Constants
ECPubKey.curve = secp256k1

// Static constructors
ECPubKey.fromBuffer = function(buffer) {
  var Q = ecurve.Point.decodeFrom(ECPubKey.curve, buffer)
  return new ECPubKey(Q, Q.compressed)
}

ECPubKey.fromHex = function(hex) {
  return ECPubKey.fromBuffer(new Buffer(hex, 'hex'))
}

// Operations
ECPubKey.prototype.getAddress = function(network) {
  network = network || networks.bitcoin

  return new Address(crypto.hash160(this.toBuffer()), network.pubKeyHash)
}

ECPubKey.prototype.verify = function(hash, signature) {
  return ecdsa.verify(ECPubKey.curve, hash, signature, this.Q)
}

// Export functions
ECPubKey.prototype.toBuffer = function() {
  return this.Q.getEncoded(this.compressed)
}

ECPubKey.prototype.toHex = function() {
  return this.toBuffer().toString('hex')
}

module.exports = ECPubKey