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Replace compile-time HMAC key with USB provisioning

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ESP firmware:
- Store HMAC key in NVS via Preferences library instead of compile-time
  hmac_key.h
- KEY? responds with HMAC_KEY:<hex> (if provisioned) or NO_KEY
- New SET_KEY:<64-hex> command stores key in NVS and responds OK
- Boot messages updated to reflect provisioning state

Android app:
- UsbKeyReceiver detects NO_KEY response and auto-provisions:
  generates random 32-byte key via SecureRandom, sends SET_KEY,
  waits for OK, saves key to SharedPreferences
- Read loop now breaks on both HMAC_KEY: and NO_KEY responses

Cleanup:
- Removed tools/generate_hmac_key.py and src/hmac_key.h
- Removed hmac_key.h from .gitignore
- README updated for new provisioning flow
This commit is contained in:
eddy 2026-07-26 09:30:21 +02:00
commit 9a84b05b8a
5 changed files with 155 additions and 116 deletions
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3
.gitignore vendored
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@ -1,6 +1,3 @@
# HMAC key (generated, do not commit)
src/hmac_key.h
# PlatformIO
.pio/
.pioenvs/