⚡️ react-native-quick-bip39

A fast implementation of bip39 using react-native-quick-crypto

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 react-native-quick-bip39

Drop-in replacement for bip39

This library exposes all the same methods from the original JavaScript implementation. If your react-native project depends on that, you can modify your metro.config.js to replace all calls with a fully native implementation:

Use the resolveRequest configuration option in your metro.config.js

config.resolver.resolveRequest = (context, moduleName, platform) => {
  if (moduleName === 'bip39') {
    // when importing bip39, resolve to react-native-quick-bip39
    return context.resolveRequest(
      context,
      'react-native-quick-bip39',
      platform,
    )
  }

  // otherwise chain to the standard Metro resolver.
  return context.resolveRequest(context, moduleName, platform)
}

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

Examples

import * as bip39 from 'react-native-quick-bip39'

// Generate a random mnemonic, defaults to 128-bits of entropy
const mnemonic = bip39.generateMnemonic()
// => 'seed sock milk update focus rotate barely fade car face mechanic mercy'

bip39.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 ...>

bip39.mnemonicToSeed('basket actual', 'a password')
// => <Buffer 46 16 a4 4f 2c 90 b9 69 02 14 b8 fd 43 5b b4 14 62 43 de 10 7b 30 87 59 0a 3b b8 d3 1b 2f 3a ef ab 1d 4b 52 6d 21 e5 0a 04 02 3d 7a d0 66 43 ea 68 3b ... >

bip39.mnemonicToSeed('basket actual').toString('hex')
// => '5cf2d4a8b0355e90295bdfc565a022a409af063d5365bb57bf74d9528f494bfa4400f53d8349b80fdae44082d7f9541e1dba2b003bcfec9d0d53781ca676651f'

// same as mnemonicToSeed to enable drop-in replacement
// both are synchronous and fast
bip39.mnemonicToSeedSync('basket actual').toString('hex')
// => '5cf2d4a8b0355e90295bdfc565a022a409af063d5365bb57bf74d9528f494bfa4400f53d8349b80fdae44082d7f9541e1dba2b003bcfec9d0d53781ca676651f'

bip39.validateMnemonic(mnemonic)
// => true

bip39.validateMnemonic('basket actual')
// => false

// defaults to BIP39 English word list
// uses HEX strings for entropy
const mnemonic = bip39.entropyToMnemonic('00000000000000000000000000000000')
// => abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about

// reversible
bip39.mnemonicToEntropy(mnemonic)
// => '00000000000000000000000000000000'

Credits

• @dreson4/react-native-quick-bip39
• react-native-bip39
• Original Javascript implementation of Bitcoin BIP39