react-native-securerandom/README.md

Generate cryptographically-secure random bytes in react native

# react-native-securerandom
[![npm version](https://badge.fury.io/js/react-native-securerandom.svg)](https://badge.fury.io/js/react-native-securerandom)

A library to generate cryptographically-secure random bytes. Uses `SecRandomCopyBytes` on iOS, `SecureRandom` on Android and `System.Security.Cryptography.RandomNumberGenerator` on Windows.

## Usage
The library exports a single function:
### generateSecureRandom(length: number) => Promise\<Uint8Array\>
Takes a length, the number of bytes to generate, and returns a `Promise` that resolves with a `Uint8Array`.

```javascript
import { generateSecureRandom } from 'react-native-securerandom';

generateSecureRandom(12).then(randomBytes => console.log(randomBytes));
```

## Installation

`$ yarn add react-native-securerandom`

### Automatic linking with react-native link

`$ react-native link react-native-securerandom`

### Manual linking

#### iOS

##### With Cocoapods
1. Add `pod 'RNSecureRandom', :path => '../node_modules/react-native-securerandom'` to your `Podfile` (changing your `node_modules` path as appropriate)
2. Run `pod install` from the same directory as your `Podfile`

##### Without Cocoapods
1. In XCode, in the project navigator, right click `Libraries` ➜ `Add Files to [your project's name]`
2. Go to `node_modules` ➜ `react-native-securerandom` and add `RNSecureRandom.xcodeproj`
3. In XCode, in the project navigator, select your project. Add `libRNSecureRandom.a` to your project's `Build Phases` ➜ `Link Binary With Libraries`

#### Android

1. Open up `android/app/src/main/java/[...]/MainActivity.java`
  - Add `import net.rhogan.rnsecurerandom.RNSecureRandomPackage;` to the imports at the top of the file
  - Add `new RNSecureRandomPackage()` to the list returned by the `getPackages()` method
2. Append the following lines to `android/settings.gradle`:
  	```
  	include ':react-native-securerandom'
  	project(':react-native-securerandom').projectDir = new File(rootProject.projectDir, 	'../node_modules/react-native-securerandom/android')
  	```
3. Insert the following lines inside the dependencies block in `android/app/build.gradle`:
  	```
      compile project(':react-native-securerandom')
  	```

#### Windows

See [react-native-windows](https://github.com/Microsoft/react-native-windows)

1. In Visual Studio add `node_modules/react-native-securerandom/windows/RNSecureRandom.sln` folder to your solution, and reference from your app.
2. Open up your app's `MainPage.cs`
  - Add `using Net.Rhogan.RNSecureRandom.RNSecureRandom;` to the usings at the top of the file
  - Add `new RNSecureRandomPackage()` to the `List<IReactPackage>` returned by the `Packages` method