react-native-rsa

A library which provides cryptographic functions to React Native. This library is compatible with Expo, no ejection required.

Use Case

Other similar libraries either do not provide key generation functionality or are not compatible with Expo. This library solves both problems.

Examples

Installation

npm install react-native-rsa

Key Generation

const RSAKey = require('react-native-rsa');
const bits = 1024;
const exponent = '10001'; // must be a string. This is hex string. decimal = 65537
const rsa = new RSAKey();
rsa.generate(bits, exponent);
const publicKey = rsa.getPublicString(); // return json encoded string
const privateKey = rsa.getPrivateString(); // return json encoded string

Encryption

const rsa = new RSAKey();
rsa.setPublicString(publicKey);
const originText = 'sample String Value';
const encrypted = rsa.encrypt(originText);

Decryption

rsa.setPrivateString(privateKey);
const decrypted = rsa.decrypt(encrypted); // decrypted == originText

Tested works with ursa in nodejs (with ursa padding set to PKCS1).

Credits

This library uses Tom Wu's jsbn http://www-cs-students.stanford.edu/~tjw/jsbn/. The original creator of this library is https://github.com/z-hao-wang/. The original URL is https://github.com/z-hao-wang/react-native-rsa. I (mrbros35) have updated the documentation and plan on updating the NPM version to include updated functionalities.

TODO

If you would like to contribute, please create a pull request. Currently, the library is missing PEM handling.

Known issues:

• Node js may complain about 'window' is not defined. I just commented out the 'window' related codes in rng.js and it worked. (It look like just adding some extra randomness. Should still work without that part). I don't recommend using this lib in nodejs. I use ursa or node-rsa lib for nodejs.