Momentum-Apps

FlipBIP - BIP32/39/44 Tool

Crypto toolkit for Flipper Zero

Background

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

How to install on Flipper Zero

• If you do not have one, download a Flipper Zero firmware to get the fbt build tool
• Plug your Flipper Zero in via USB
• Copy the contents of this folder into the applications_user folder of your firmware
• Modify the site_scons/cc.scons file in the Flipper Zero firmware to remove the "-Wdouble-promotion" warning and add the "-Os" flag

Then run the command:

.\fbt COMPACT=1 DEBUG=0 launch_app APPSRC=applications_user/FlipBIP

The application will be compiled and copied onto your device

Status

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
• BIP39 mnemonic to BIP39 seed generation
• Hierarchical Deterministic (HD) wallet generation from seed
  • Generation of offline m/44'/0'/0'/0 BTC wallet
  • Similar features to: https://iancoleman.io/bip39/

Work in Progress

• Support for BIP39 passphrase
  • Currently blank
• Support for custom BIP32 wallet paths
  • Currently hardcoded to m/44'/0'/0'/0

(FAR) Future

• More coin types
• Saving wallets to disk
• USB/Bluetooth wallet functionality