⚡️ react-native-quick-bip39

A react-native ready very fast implementation of bip39 using react-native-quick-crypto and react-native-quick-base64

All methods are sync, as react-native-quick-crypto uses JSI under the hood.

Reminder for developers

Please remember to allow recovery from mnemonic phrases that have invalid checksums (or that you don't have the wordlist)

When a checksum is invalid, warn the user that the phrase is not something generated by your app, and ask if they would like to use it anyway. This way, your app only needs to hold the wordlists for your supported languages, but you can recover phrases made by other apps in other languages.

However, there should be other checks in place, such as checking to make sure the user is inputting 12 words or more separated by a space. ie. phrase.trim().split(/\s+/g).length >= 12

Installation

yarn add @dreson4/react-native-quick-bip39

If you don't yet have react-native-quick-crypto and react-native-quick-base64 installed then run

yarn add react-native-quick-crypto
yarn add react-native-quick-base64
cd ios && pod install

Or see react-native-quick-crypto for further installation instructions if needed.

Replace crypto-browserify

If you are using a library that depends on crypto, instead of polyfilling it with crypto-browserify (or react-native-crypto) you can use react-native-quick-crypto for a fully native implementation. This way you can get much faster crypto operations with just a single-line change!

In your babel.config.js, add a module resolver to replace crypto with react-native-quick-crypto:

module.exports = {
  presets: ['module:metro-react-native-babel-preset'],
  plugins: [
+   [
+     'module-resolver',
+     {
+       alias: {
+         'crypto': 'react-native-quick-crypto',
+         'stream': 'stream-browserify',
+         'buffer': '@craftzdog/react-native-buffer',
+       },
+     },
+   ],
    ...
  ],
};

Then restart your bundler using yarn start --reset-cache.

Now, all imports for crypto will be resolved as react-native-quick-crypto instead.

💡 Since react-native-quick-crypto depends on stream and buffer, we can resolve those to stream-browserify and @craftzdog's react-native-buffer (which is faster than buffer because it uses JSI for base64 encoding and decoding).

Examples

import {
  generateMnemonic,
  mnemonicToSeedHex,
  validateMnemonic,
  entropyToMnemonic,
  mnemonicToEntropy,
  Wordlists,
} from "@dreson4/react-native-quick-bip39";

// Generate a random mnemonic defaults to 128-bits of entropy
generateMnemonic(256);
// => reveal man culture nominee tag abuse keen behave refuse warfare crisp thunder valve knock unique try fold energy torch news thought access hawk table

//For other languages included see Worldlists
generateMnemonic(256, Worldlists.ko); //returns korean mnemonic

mnemonicToSeedHex("basket actual");
// => '5cf2d4a8b0355e90295bdfc565a022a409af063d5365bb57bf74d9528f494bfa4400f53d8349b80fdae44082d7f9541e1dba2b003bcfec9d0d53781ca676651f'

mnemonicToSeed("basket actual");
// => <Buffer 5c f2 d4 a8 b0 35 5e 90 29 5b df c5 65 a0 22 a4 09 af 06 3d 53 65 bb 57 bf 74 d9 52 8f 49 4b fa 44 00 f5 3d 83 49 b8 0f da e4 40 82 d7 f9 54 1e 1d ba 2b ...>

validateMnemonic(myMnemonic);
// => true

validateMnemonic("basket actual");
// => false

Credits

• react-native-bip39
• Original Javascript implementation of Bitcoin BIP39