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README.md

FlipBIP - BIP32/39/44

https://github.com/xtruan/FlipBIP

Crypto toolkit for Flipper Zero

  • Using Trezor crypto libs from core/v2.5.3 release

Background

The goal of this project is to see how much crypto functionality can be brought to the Flipper Zero.

Complete

  • Trezor crypto C code ported into crypto subfolder
    • Adapted to use Flipper hardware RNG (see crypto/rand.c)
    • Imports and some C library functions modified for compatibility with FBT
  • Navigation and UI adapted from FAP Boilerplate app
  • BIP39 mnemonic generation
    • 24, 18, or 12 words configured in settings
  • BIP39 mnemonic to BIP39 seed generation
  • Hierarchical Deterministic (HD) wallet generation from seed
    • Generation of offline m/44'/0'/0'/0 BTC wallet
    • Generation of offline m/44'/60'/0'/0 ETH wallet (coded from the $SPORK Castle of ETHDenver 2023!)
    • Generation of offline m/44'/3'/0'/0 DOGE wallet
    • Generation of offline m/44'/133'/0'/0 ZEC transparent address wallet (by @wh00hw)
    • Similar features to: https://iancoleman.io/bip39/
  • Saving wallets to SD card
    • Wallets are saved to SD card upon creation in apps_data/flipbip
      • NOTE: apps_data folder must already exist on SD card!
    • Saved wallets can be viewed between app runs
    • Wallets are encrypted with a randomly generated key, and that key is also encrypted
      • .flipbip.dat and .flipbip.key files are both required to be in apps_data/flipbip
      • Backups of both these files .flipbip.dat.bak and .flipbip.key.bak are also maintained
      • If you want to externally back up your wallet, I recommend copying all these files, and storing the key and dat files seperately
    • NOTE: The wallets should be decently tough to crack off of a Flipper, however any Flipper with the app installed can load a wallet in the apps_data/flipbip directory if both the key and dat file are present
  • BIP39 passphrase support
    • Configured in settings, not persisted between runs for security
  • Import your own mnemonic
    • Lots of typing required but you can now use the wallet with an existing mnemonic you have saved
    • Useful to convert paper backup to keys and receive addresses without relying on a laptop or phone
  • Improved receive address generation features
    • Addresses are now generated at the same time as other pieces of wallet info
    • This slows down initial wallet load, but makes UI much more responsive
    • QR code files are now generated for each address and stored in the apps_data/flipbip directory
    • This app is required to view the QR code files: https://github.com/bmatcuk/flipperzero-qrcode
    • NOTE: This happens during the View Wallet step; you must view a wallet after generating/importing a wallet in order to ensure the address QR files are correct
  • Broke out crypto functionality into its own library using fap_private_libs feature

Work in Progress

  • More coin types
    • Support for more custom BIP32 wallet paths

(FAR) Future

  • Custom wallet security
    • User specified password
  • USB/Bluetooth wallet functionality