Momentum-Apps

FlipBIP - BIP32/39/44 Tool

Crypto toolkit for Flipper Zero

• Built against 0.78.1 Flipper Zero firmware release
• 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.

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