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React-Native newbie here running into problems and wondering if I have missed a fundamental step in the installation of packages.

I have been trying to use the react-native-rsa-native package (https://github.com/amitaymolko/react-native-rsa-native)

However I am getting 

TypeError: undefined is not an object (evaluating '_reactNativeRsaNative.RSA.generateKeys')

My test code is: 

import React from 'react';
import { StyleSheet, Text, View } from 'react-native';

import { RSA, RSAKeychain } from 'react-native-rsa-native';

export default class App extends React.Component {

  componentWillMount() {
    RSA.generateKeys(4096) // set key size
      .then(keys => {
        console.log('4096 private:', keys.private) // the private key
        console.log('4096 public:', keys.public) // the public key
      });
  }

  render() {
    ...
  }
}

The steps followed were:

expo init rsatest --template blank@sdk-31 --yarn
cd rsatest
yarn add react-native-rsa-native
react-native link react-native-rsa-native
yarn start

The react-native-rsa-native package does appear in the node_modules directory however I feel I am missing something.

Any ideas?

Rhys
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3 Answers3

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One thing that may be relevant is componentWillMount is being deprecated.

https://reactjs.org/docs/react-component.html React docs work as the foundation for react native docs.

Also with componentWillMount() if there is fetch call, with a promise, the promise will not return before component mount, the component will return empty at least once.

I suggest trying componentDidMount()

Hope this helps

Edited for spelling*

Simon Hodson
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  • I've changed componentWillMount to componentDidMount and unfortunately the same error remains :( – Rhys Mar 30 '19 at 09:51
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That library is not compatible with Expo. Check here why: react native link using expo?

So you might want to expo eject. Which I think is not an option either.

How about you try this one below instead? https://github.com/z-hao-wang/react-native-rsa

Tyro Hunter
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  • That explains why it wasnt and will not work. I had seen react-native-rsa but went for react-native-rsa-native as it provided sign and verify functionality which i will eventually need. I will keep searching. Many thanks for the answer. – Rhys Mar 30 '19 at 12:06
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You can delete the node modul and then npm install react-native link react-native run-android/ run-ios

maybe

this helpfull : how to delete installed library form react native project

zidniryi
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