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PK�����N[o/�M��M��	��README.mdnu�ȯ����������# random-bytes

[![NPM Version][npm-image]][npm-url]
[![NPM Downloads][downloads-image]][downloads-url]
[![Node.js Version][node-version-image]][node-version-url]
[![Build Status][travis-image]][travis-url]
[![Test Coverage][coveralls-image]][coveralls-url]

Generate strong pseudo-random bytes.

This module is a simple wrapper around the Node.js core `crypto.randomBytes` API,
with the following additions:

* A `Promise` interface for environments with promises.
  * For Node.js versions that do not wait for the PRNG to be seeded, this module
    will wait a bit.

## Installation

```sh
$ npm install random-bytes
```

## API

```js
var randomBytes = require('random-bytes')
```

### randomBytes(size, callback)

Generates strong pseudo-random bytes. The `size` argument is a number indicating
the number of bytes to generate.

```js
randomBytes(12, function (error, bytes) {
  if (error) throw error
  // do something with the bytes
})
```

### randomBytes(size)

Generates strong pseudo-random bytes and return a `Promise`. The `size` argument is
a number indicating the number of bytes to generate.

**Note**: To use promises in Node.js _prior to 0.12_, promises must be
"polyfilled" using `global.Promise = require('bluebird')`.

```js
randomBytes(18).then(function (string) {
  // do something with the string
})
```

### randomBytes.sync(size)

A synchronous version of above.

```js
var bytes = randomBytes.sync(18)
```

## License

[MIT](LICENSE)

[npm-image]: https://img.shields.io/npm/v/random-bytes.svg
[npm-url]: https://npmjs.org/package/random-bytes
[node-version-image]: https://img.shields.io/node/v/random-bytes.svg
[node-version-url]: http://nodejs.org/download/
[travis-image]: https://img.shields.io/travis/crypto-utils/random-bytes/master.svg
[travis-url]: https://travis-ci.org/crypto-utils/random-bytes
[coveralls-image]: https://img.shields.io/coveralls/crypto-utils/random-bytes/master.svg
[coveralls-url]: https://coveralls.io/r/crypto-utils/random-bytes?branch=master
[downloads-image]: https://img.shields.io/npm/dm/random-bytes.svg
[downloads-url]: https://npmjs.org/package/random-bytes
PK�����N[*���^��^����LICENSEnu�ȯ����������The MIT License (MIT)

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
PK�����N[��c;���;���
��HISTORY.mdnu�ȯ����������1.0.0 / 2016-01-17
==================

* Initial release
PK�����N['����������package.jsonnu�ȯ����������{
  "name": "random-bytes",
  "description": "URL and cookie safe UIDs",
  "version": "1.0.0",
  "contributors": [
    "Douglas Christopher Wilson <doug@somethingdoug.com>"
  ],
  "license": "MIT",
  "repository": "crypto-utils/random-bytes",
  "devDependencies": {
    "bluebird": "3.1.1",
    "istanbul": "0.4.2",
    "mocha": "2.3.4",
    "proxyquire": "1.2.0"
  },
  "files": [
    "LICENSE",
    "HISTORY.md",
    "README.md",
    "index.js"
  ],
  "engines": {
    "node": ">= 0.8"
  },
  "scripts": {
    "test": "mocha --trace-deprecation --reporter spec --bail --check-leaks test/",
    "test-cov": "istanbul cover node_modules/mocha/bin/_mocha -- --trace-deprecation --reporter dot --check-leaks test/",
    "test-travis": "istanbul cover node_modules/mocha/bin/_mocha --report lcovonly -- --trace-deprecation --reporter spec --check-leaks test/"
  },
  "keywords": [
    "bytes",
    "generator",
    "random",
    "safe"
  ]
}
PK�����N[��Y��������index.jsnu�ȯ����������/*!
 * random-bytes
 * Copyright(c) 2016 Douglas Christopher Wilson
 * MIT Licensed
 */

'use strict'

/**
 * Module dependencies.
 * @private
 */

var crypto = require('crypto')

/**
 * Module variables.
 * @private
 */

var generateAttempts = crypto.randomBytes === crypto.pseudoRandomBytes ? 1 : 3

/**
 * Module exports.
 * @public
 */

module.exports = randomBytes
module.exports.sync = randomBytesSync

/**
 * Generates strong pseudo-random bytes.
 *
 * @param {number} size
 * @param {function} [callback]
 * @return {Promise}
 * @public
 */

function randomBytes(size, callback) {
  // validate callback is a function, if provided
  if (callback !== undefined && typeof callback !== 'function') {
    throw new TypeError('argument callback must be a function')
  }

// require the callback without promises
  if (!callback && !global.Promise) {
    throw new TypeError('argument callback is required')
  }

if (callback) {
    // classic callback style
    return generateRandomBytes(size, generateAttempts, callback)
  }

return new Promise(function executor(resolve, reject) {
    generateRandomBytes(size, generateAttempts, function onRandomBytes(err, str) {
      if (err) return reject(err)
      resolve(str)
    })
  })
}

/**
 * Generates strong pseudo-random bytes sync.
 *
 * @param {number} size
 * @return {Buffer}
 * @public
 */

function randomBytesSync(size) {
  var err = null

for (var i = 0; i < generateAttempts; i++) {
    try {
      return crypto.randomBytes(size)
    } catch (e) {
      err = e
    }
  }

throw err
}

/**
 * Generates strong pseudo-random bytes.
 *
 * @param {number} size
 * @param {number} attempts
 * @param {function} callback
 * @private
 */

function generateRandomBytes(size, attempts, callback) {
  crypto.randomBytes(size, function onRandomBytes(err, buf) {
    if (!err) return callback(null, buf)
    if (!--attempts) return callback(err)
    setTimeout(generateRandomBytes.bind(null, size, attempts, callback), 10)
  })
}
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