bitcoinjs-lib/src/bigi.js

var assert = require('assert')
var BigInteger = require('bigi')

// Import operations
BigInteger.fromHex = function(hex) {
  var buffer = new Buffer(hex, 'hex')
  assert.equal(buffer.length, Buffer.byteLength(hex) / 2)

  return BigInteger.fromBuffer(buffer)
}

BigInteger.fromBuffer = function(buffer) {
  assert(Array.isArray(buffer) || Buffer.isBuffer(buffer)) // FIXME: Transitionary

  // FIXME: Transitionary
  if (Buffer.isBuffer(buffer)) {
    buffer = Array.prototype.slice.call(buffer)
  }

  return BigInteger.fromByteArrayUnsigned(buffer)
}

// Export operations
BigInteger.prototype.toBuffer = function() {
  return new Buffer(this.toByteArrayUnsigned())
}

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

BigInteger.prototype.toPaddedBuffer = function(s) {
    var buffer = this.toBuffer()
    var padded = new Buffer(s - buffer.length)
    padded.fill(0)

    return Buffer.concat([padded, buffer], s)
}

module.exports = BigInteger