react-native-cryptography

react-native-cryptography

Important notes: On iOS, this is not a library project - see installation instructions

• iOS CryptoSwift

• Android BouncyCastle !TODO finish md5 and sha256!

Cryptographic functions

Symetric ciphering

func	ios	android
AES 128	✓	✓
AES 192	✓	✓
AES 256	✓	✓

• AES 128 (pass 16 bytes key and iv)

• AES 192 (pass 24 bytes key and iv)

• AES 256 (pass 32 bytes key and iv)

Hashing

func	ios	android
MD5	✓	TODO
SHA256	✓	TODO

Getting started

$ npm install react-native-cryptography --save

Mostly automatic installation

Android:

$ react-native link react-native-cryptography

iOS: See manual installation section

Manual installation

iOS

1. In XCode, in the project navigator, right click <Your Target> ➜ Add Files to [your project's name]
2. Go to node_modules ➜ react-native-cryptography and add RNCryptography.m + RNCryptography.swift
3. Accept the bridging header creation and add #import <React/RCTBridge.h>
4. Add a Podfile in the sources root dir and add pod 'CryptoSwift' to it.
5. cd ios/ && pod install
6. Reopen xcode using your app workspace

Android

1. Open up android/app/src/main/java/[...]/MainActivity.java

• Add import com.reactlibrary.RNCryptographyPackage; to the imports at the top of the file
• Add new RNCryptographyPackage() to the list returned by the getPackages() method

1. Append the following lines to android/settings.gradle:

   include ':react-native-cryptography'
   project(':react-native-cryptography').projectDir = new File(rootProject.projectDir, 	'../node_modules/react-native-cryptography/android')
   

2. Insert the following lines inside the dependencies block in android/app/build.gradle:

     compile project(':react-native-cryptography')
   

Usage

import React, { Component } from 'react';
import { Button, StyleSheet, Text, TextInput, View } from 'react-native';
import RNCryptography from 'react-native-cryptography';

const styles = StyleSheet.create({
  container: {
    flex: 1,
    marginTop: 50,
    justifyContent: 'flex-start',
    alignItems: 'center',
  },
});

export default class App extends Component {
  static AES_KEY_128 = 'keykeykeykeykeyk';
  static AES_IV_128 = 'drowssapdrowssap';

  encryptAES() {
    RNCryptography.encryptAES('Hello, I am the message to cipher', App.AES_KEY_128, App.AES_IV_128) 
      .then(value => console.log(value))
      .catch(err => console.error(err));
  }

  decryptAES() {
    RNCryptography.decryptAES('FNblGLlDskkoe1vLbwtTJ8xeIXmQp3udaFL8KI91hfGhYFyqA0eLcfoy3iFFw2af', App.AES_KEY_128, App.AES_IV_128) 
      .then(value => console.log(value))
      .catch(err => console.error(err));
  }

  md5() {
    RNCryptography.md5('string to digest').then(digest => console.log(digest));
  }

  sha256() {
    RNCryptography.sha256('string to digest').then(digest => console.log(digest));
  }

  render() {
    return (
      <View style={styles.container}>
        <Button onPress={this.encryptAES} title={'encrypt with AES'} />
        <Button onPress={this.decryptAES} title={'decrypt AES'} />
        <Button onPress={this.md5} title={'MD5'} />
        <Button onPress={this.sha256} title={'SHA256'} />
      </View>
    );
  }
}