Here is a list of all files with brief descriptions:

[detail level 1234]

examples
BasicUsage
BasicUsage.ino
Connect
Connect.ino
Sign
Sign.ino
UsdcSigning
config.template.h
keccak256.cpp	Keccak-256 (SHA3 variant) hash implementation for Ethereum
keccak256.h	Keccak-256 (SHA3 variant) hash function for Ethereum
UsdcSigning.ino
util.cpp
util.h
VerifyPin
VerifyPin.ino
src
cryptnox-sdk-cpp
fuzz
corpus
fuzz_der.cpp
CryptnoxWallet.cpp	Implementation of the high-level CryptnoxWallet API
CryptnoxWallet.h	High-level API for interacting with a Cryptnox Hardware Wallet over NFC
CW_CryptoProvider.h	Abstract cryptographic primitives interface
CW_Defs.h	Shared constants, error codes, and session state for the SDK
CW_Logger.h	Abstract logging interface
CW_NfcTransport.h	Abstract NFC transport interface
CW_Platform.h	Abstract platform interface for timing primitives
CW_SecureChannel.cpp	Implementation of the Cryptnox secure channel protocol
CW_SecureChannel.h	Cryptnox secure channel protocol over NFC
CW_TrustedKeys.h	Cryptnox CA public keys used for offline certificate verification
CW_Utils.cpp	Implementation of the platform-independent utility helpers
CW_Utils.h	Platform-independent security and memory utilities
platform_compat.h	Arduino compatibility shims for non-Arduino (plain C++) builds
ArduinoCryptoProvider.cpp	Implementation of the Arduino UNO R4 concrete crypto provider
ArduinoCryptoProvider.h	Concrete CW_CryptoProvider for the Arduino UNO R4 (RA4M1)
ArduinoLoggerAdapter.cpp	Implementation of the HardwareSerial-backed logger
ArduinoLoggerAdapter.h	Concrete CW_Logger over HardwareSerial for development builds
ArduinoPlatform.cpp	Implementation of the Arduino blocking-delay platform adapter
ArduinoPlatform.h	Concrete CW_Platform over Arduino's delay()
CryptnoxWallet.h	Umbrella include and module-group anchor for the CryptnoxWallet Arduino library
NullLoggerAdapter.h	Silent CW_Logger for production firmware
PN532Adapter.cpp	Implementation of the PN532 transport adapter
PN532Adapter.h	Concrete CW_NfcTransport over Adafruit_PN532 (SPI / I2C / UART)