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Viewing file:     index.js (3.66 KB)      -rw-r--r--

var Buffer = require('safe-buffer').Buffer
var Transform = require('stream').Transform
var StringDecoder = require('string_decoder').StringDecoder
var inherits = require('inherits')

var useUint8Array = typeof Uint8Array !== 'undefined';
var useArrayBuffer = typeof ArrayBuffer !== 'undefined'
  && typeof Uint8Array !== 'undefined'
  && ArrayBuffer.isView
  && (Buffer.prototype instanceof Uint8Array || Buffer.TYPED_ARRAY_SUPPORT);

function CipherBase (hashMode) {
  Transform.call(this)
  this.hashMode = typeof hashMode === 'string'
  if (this.hashMode) {
    this[hashMode] = this._finalOrDigest
  } else {
    this.final = this._finalOrDigest
  }
  if (this._final) {
    this.__final = this._final
    this._final = null
  }
  this._decoder = null
  this._encoding = null
}
inherits(CipherBase, Transform)

CipherBase.prototype.update = function (data, inputEnc, outputEnc) {
  var bufferData;
  if (data instanceof Buffer) {
    // No need to do anything
    bufferData = data;
  } else if (typeof data === 'string') {
    // Convert strings to Buffer
    bufferData = Buffer.from(data, inputEnc);
  } else if (useArrayBuffer && ArrayBuffer.isView(data)) {
    /*
     * Wrap any TypedArray instances and DataViews
     * Makes sense only on engines with full TypedArray support -- let Buffer detect that
     */
    bufferData = Buffer.from(data.buffer, data.byteOffset, data.byteLength);
  } else if (useUint8Array && data instanceof Uint8Array) {
    /*
     * Uint8Array in engines where Buffer.from might not work with ArrayBuffer, just copy over
     * Doesn't make sense with other TypedArray instances
     */
    bufferData = Buffer.from(data);
  } else if (
    Buffer.isBuffer(data)
    && data.constructor
    && data.constructor.isBuffer
    && data.constructor.isBuffer(data)
  ) {
    /*
     * Old Buffer polyfill on an engine that doesn't have TypedArray support
     * Also, this is from a different Buffer polyfill implementation then we have, as instanceof check failed
     * Convert to our current Buffer implementation
     */
    bufferData = Buffer.from(data);
  } else {
    throw new Error('The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView.');
  }

  var outData = this._update(bufferData)
  if (this.hashMode) return this

  if (outputEnc) {
    outData = this._toString(outData, outputEnc)
  }

  return outData
}

CipherBase.prototype.setAutoPadding = function () {}
CipherBase.prototype.getAuthTag = function () {
  throw new Error('trying to get auth tag in unsupported state')
}

CipherBase.prototype.setAuthTag = function () {
  throw new Error('trying to set auth tag in unsupported state')
}

CipherBase.prototype.setAAD = function () {
  throw new Error('trying to set aad in unsupported state')
}

CipherBase.prototype._transform = function (data, _, next) {
  var err
  try {
    if (this.hashMode) {
      this._update(data)
    } else {
      this.push(this._update(data))
    }
  } catch (e) {
    err = e
  } finally {
    next(err)
  }
}
CipherBase.prototype._flush = function (done) {
  var err
  try {
    this.push(this.__final())
  } catch (e) {
    err = e
  }

  done(err)
}
CipherBase.prototype._finalOrDigest = function (outputEnc) {
  var outData = this.__final() || Buffer.alloc(0)
  if (outputEnc) {
    outData = this._toString(outData, outputEnc, true)
  }
  return outData
}

CipherBase.prototype._toString = function (value, enc, fin) {
  if (!this._decoder) {
    this._decoder = new StringDecoder(enc)
    this._encoding = enc
  }

  if (this._encoding !== enc) throw new Error('can\'t switch encodings')

  var out = this._decoder.write(value)
  if (fin) {
    out += this._decoder.end()
  }

  return out
}

module.exports = CipherBase