osamaqarem / react-native-freeotp

Generate the same TOTP tokens as FreeOTP from your React Native app.

react-native-freeotp

Native module for generating the same TOTP tokens as FreeOTP from your React Native app.

Installation

npm install react-native-freeotp

Android

Rebuild the app.

iOS

Install the pod, then rebuild the app.

npx pod-install

Usage

import FreeOtp from 'react-native-freeotp';

const tokenPair = await FreeOtp.getTokenPair(totpUrl);

Types

Result:

type TokenPair = {
  /**
   * Current token.
   */
  tokenOne: string;
  /**
   * Next period step token.
   */
  tokenTwo: string;
  /**
   * Seconds until expiry of the current token.
   */
  tokenOneExpires: string;
  /**
   * Seconds until expiry of the next token.
   */
  tokenTwoExpires: string;
};

Contributing

See the contributing guide to learn how to contribute to the repository and the development workflow.

License

MIT

react-native-freeotp's Issues

iOS - UnsafePointer fatal crash on Xcode 14 simulator

After upgrading to Xcode 14 me and my team have experience issues developing with the iOS Simulator due to a fatal crash.

The crash occurs when generating the code in the following lines:

// ios/Core/OTP.swift ~ func code ~ line 121
let msk = UnsafePointer<UInt8>(buf).advanced(by: off).withMemoryRebound(to: UInt32.self, capacity: size/4) {
     $0[0].bigEndian & 0x7fffffff
}

Additionally in Xcode that line shows the following compilation warning: "Initialization of 'UnsafePointer' results in a dangling pointer".

Based on this commit replacing that lines with the ones of the commit solves the problem.

// Fix
let bin_code = Array(buf[off...off + 3])
var msk = bin_code.withUnsafeBytes {
     $0.load(as: UInt32.self).bigEndian
}
msk &= 0x7fffffff

I've already tested the fix and I'll submit a pull request with the changes.