Merge lpc55 into embedded runner

[robin-nitrokey]

This PR merges the lpc55 runner into the embedded runner (currently only used for nrf52). This makes the firmware very much hardware agnostic, reduces the code duplication between the lpc55 and nrf52 targets and makes maintenance easier.

Fixes #79

(The old lpc55 runner is not yet deleted in this PR so that it still can be used for reference.)

For comparison, the numbers of lines of Rust code in the runners (calculated with cloc) are:

Runner	loc
lpc55 (legacy)	3,073
embedded (nrf52-only)	2,634
embedded (nrf52 + lpc55)	4,304

Build instructions

To build the firmware, you need a recent Rust version with the thumbv8m.main-none-eabi target, e. g. installed with rustup:

$ rustup update stable
$ rustup target add thumbv8m.main-none-eabi

There are also some required libraries and tools, e. g. for Debian:

$ sudo apt-get install llvm clang libclang-dev gcc-arm-none-eabi libc6-dev-i386 python3-toml

Now you can build the lpc55 and nrf52 runners:

$ cd runners/embedded
$ make build-nk3am  # nrf52
$ make build-nk3xn  # lpc55

Execution logs (lpc55)

$ make run-nk3xn FEATURES=develop,log-semihosting
# ...
making flash
making fs
mount start 64 ms
inside IDLE, initial SP = 20030248
Embedded Runner (LPC55:nk3xn) using librunner 1.2.2
do not need to update cfpa version 4194434
bootrom request start 0
EEPROM already initialized.
EFS Mount Error, Reformat Ok(())
mount end 96 ms
init took 96 ms

Test of USB communication, touch button, LED, admin and FIDO2 applications:

$ nitropy nk3 test --all
Command line tool to interact with Nitrokey devices 0.4.29
Found 1 Nitrokey 3 device(s):
- Nitrokey 3 at /dev/hidraw0

Running tests for Nitrokey 3 at /dev/hidraw0

[1/5]   uuid            UUID query                      SUCCESS         223FE5E2AE287150AD9DAD9E34B7F989
[2/5]   version         Firmware version query          SUCCESS         v1.2.2
[3/5]   bootloader      Bootloader configuration        FAILURE         bootloader not locked
[4/5]   provisioner     Firmware mode                   SUCCESS  
Please press the touch button on the device ...
[5/5]   fido2           FIDO2                           FAILURE         Unexpected FIDO2 cert hash for version v1.2.2: c7d87cac86b69059bbff5c43872a20892267518614dfc9822c7ee55ad89f0022

5 tests, 3 successful, 0 skipped, 2 failed

Summary: 1 device(s) tested, 0 successful, 1 failed

(The test failures are caused by the device being a development device. The tests still show that the communication works correctly though.)

[daringer]

Ran some tests on NK3AM - Athene (development device):

• nitropy nk3 test (ok)
• change pin (ok)
• webauthn.bin reg/auth (ok)
• sign-in data (chromium) (ok)
• webauthn.bin.coffee (ok)
• gitlab reg/login (ok)
• ssh-keygen ed25519-sk (ok)
• reset (ok)

Execution logs (nrf52)

Embedded Runner (NRF52840:NK3AM) using librunner 1.2.2
RESET Reason: 4
FICR DeviceID 5F 74 E7 94 XX XX XX XX
FICR IdtRoot  426432f1 cafecafe cafecafe cafecafe
FICR EncRoot  4af82017 cafecafe cafecafe cafecafe
FICR DevAddr  F3 64 EA XX XX XX
UICR REGOUT0 fffffffd NFCPINS fffffffe
UICR APPROTECT is DISABLED!
qspi jedec: C8 40 15
...

[robin-nitrokey]

To do:

• manage no-encrypted-storage feature
• investigate flashing with lpc55
• monotonic

[robin-nitrokey]

This commit causes an error message during the build (though it still succeeds):

Traceback (most recent call last):                                                                       
  File "<string>", line 1, in <module> 
  File "/home/robin/venv/nk3am/lib/python3.9/site-packages/toml/decoder.py", line 133, in load
    with io.open(_getpath(f), encoding='utf-8') as ffile:
FileNotFoundError: [Errno 2] No such file or directory: 'profiles/.toml' 

Does this make sense to you @daringer? Otherwise this should be ready to merge.

Edit: Should be fixed now.

[daringer]

lgtm, some random tests on NK3mini also show no issues