cipherBase.js

var Transform = require('stream').Transform
var inherits = require('inherits')

module.exports = CipherBase
inherits(CipherBase, Transform)
function CipherBase () {
  Transform.call(this)
}
CipherBase.prototype.update = function (data, inputEnc, outputEnc) {
  if (typeof data === 'string') {
    data = new Buffer(data, inputEnc)
  }
  var outData = this._update(data)
  if (outputEnc) {
    outData = outData.toString(outputEnc)
  }
  return outData
}
CipherBase.prototype._transform = function (data, _, next) {
  this.push(this._update(data))
  next()
}
CipherBase.prototype._flush = function (next) {
  try {
    this.push(this._final())
  } catch(e) {
    return next(e)
  }
  next()
}
CipherBase.prototype.final = function (outputEnc) {
  var outData = this._final() || new Buffer('')
  if (outputEnc) {
    outData = outData.toString(outputEnc)
  }
  return outData
}