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‎CMakeLists.txt‎

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cmake_minimum_required(VERSION 3.10)
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# Project name
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project(ATECC608_RPI_Handler)
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# Set C++ standard
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set(CMAKE_CXX_STANDARD 11)
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# Find the cryptoauthlib library
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find_library(CRYPTOAUTH_LIB cryptoauth HINTS /usr/lib /usr/local/lib)
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# Find the cryptoauthlib include directory
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find_path(CRYPTOAUTH_INCLUDE_DIR
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NAMES atca_basic.h
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HINTS /usr/include /usr/local/include /usr/include/cryptoauthlib /usr/local/include/cryptoauthlib
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)
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# If the library or include directory is not found, display an error message
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if(NOT CRYPTOAUTH_LIB)
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message(FATAL_ERROR "cryptoauth library not found")
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endif()
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if(NOT CRYPTOAUTH_INCLUDE_DIR)
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message(FATAL_ERROR "cryptoauth include directory not found")
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endif()
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# Include directories
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include_directories(${CRYPTOAUTH_INCLUDE_DIR} ${PROJECT_SOURCE_DIR}/include)
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# Add the library
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add_library(atecc608_handler SHARED src/atecc608_handler.cpp)
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# Link the library with cryptoauthlib
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target_link_libraries(atecc608_handler ${CRYPTOAUTH_LIB})
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# Add the test executable
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add_executable(test_atecc608 test/test_atecc608.cpp)
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# Link the test executable with the atecc608_handler library
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target_link_libraries(test_atecc608 atecc608_handler)
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‎include/atecc608_handler.h‎

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#include <iostream>
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#include <vector>
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#include <bitset>
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// Exemple of configuration for ATECC608A. Look at page 8 on the datasheet for ATECC608A-TFLXTLS
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const uint8_t ECCX08_DEFAULT_CONFIGURATION_VALS[112] = {
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// Read only - end
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// I2C_Address
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0xC0,
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// Reserved
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0x00,
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// OTPmode
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0x55,
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// ChipMode
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0x00,
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// SlotConfig
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0x83, 0x60,
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0x87, 0x60,
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0x8F, 0x60,
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0x83, 0x60,
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0x83, 0x60,
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0x8F, 0x8F,
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0x9F, 0x8F,
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0xAF, 0x8F,
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0x00, 0x00,
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0x00, 0x00,
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0x00, 0x00,
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0x00, 0x00,
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0x00, 0x00,
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0x00, 0x00,
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0x00, 0x00,
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0xAF, 0x8F,
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// Counter[0]
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0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00,
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// Counter[1]
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0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00,
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// LastKeyUse
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0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF,
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// Write via commands only - start
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// UserExtra
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0x00,
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// Selector
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0x00,
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// LockValue
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0x55,
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// LockConfig
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0x55,
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// SlotLocked
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0xFF, 0xFF,
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// Write via commands only - end
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// RFU
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0x00, 0x00,
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// X509format
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0x00, 0x00, 0x00, 0x00,
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// KeyConfig
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0x33, 0x00, // Private | Public | P256 NIST ECC key, Default: 0x33, 0x00,
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0x33, 0x00, // Private | Public | P256 NIST ECC key, Default: 0x33, 0x00,
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0x33, 0x00, // Private | Public | P256 NIST ECC key, Default: 0x33, 0x00,
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0x1C, 0x00, // Private | Public | P256 NIST ECC key, Default: 0x1C, 0x00,
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0x33, 0x00, // Private | Public | P256 NIST ECC key, Default: 0x1C, 0x00,
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0x1C, 0x00,
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0x1C, 0x00,
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0x1C, 0x00,
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0x3C, 0x00,
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0x3C, 0x00,
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0x3C, 0x00,
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0x3C, 0x00,
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0x3C, 0x00,
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0x3C, 0x00,
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0x3C, 0x00,
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0x1C, 0x00
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};
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extern "C" int atecc_handler_write_configuration(const uint8_t *config, size_t len);
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extern "C" int atecc_handler_lock_zone(uint8_t zone);
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extern "C" int atecc_handler_init(int i2cAddr);
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extern "C" int atecc_handler_read_configuration(uint8_t *config_data);
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extern "C" int atecc_handler_inject_priv_key(int slot, uint8_t * priv_key);
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extern "C" int atecc_handler_get_public_key(int slot, uint8_t * pub_key);
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extern "C" int atecc_handler_sign(int slot, const uint8_t * msg, uint8_t * signature);
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extern "C" int atecc_handler_verify(int slot, const uint8_t * msg, const uint8_t * signature, const uint8_t * pub_key);
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extern "C" int atecc_handler_genkey(int slot, uint8_t * pub_key);
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extern "C" int atecc_handler_lock_slot(int slot);

‎python/test_atecc608.py‎

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import ctypes
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from ctypes import c_int, c_uint8, c_size_t, POINTER, byref, create_string_buffer
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import sys
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# Load the shared library
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atecc608_lib = ctypes.CDLL('../build/libatecc608_handler.so')
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# Define argument and return types for the functions
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atecc608_lib.atecc_handler_init.argtypes = [c_int]
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atecc608_lib.atecc_handler_init.restype = c_int
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atecc608_lib.atecc_handler_write_configuration.argtypes = [POINTER(c_uint8), c_size_t]
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atecc608_lib.atecc_handler_write_configuration.restype = c_int
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atecc608_lib.atecc_handler_lock_zone.argtypes = [c_uint8]
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atecc608_lib.atecc_handler_lock_zone.restype = c_int
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atecc608_lib.atecc_handler_genkey.argtypes = [c_int, POINTER(c_uint8)]
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atecc608_lib.atecc_handler_genkey.restype = c_int
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atecc608_lib.atecc_handler_inject_priv_key.argtypes = [c_int, POINTER(c_uint8)]
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atecc608_lib.atecc_handler_inject_priv_key.restype = c_int
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atecc608_lib.atecc_handler_get_public_key.argtypes = [c_int, POINTER(c_uint8)]
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atecc608_lib.atecc_handler_get_public_key.restype = c_int
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atecc608_lib.atecc_handler_sign.argtypes = [c_int, POINTER(c_uint8), POINTER(c_uint8)]
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atecc608_lib.atecc_handler_sign.restype = c_int
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atecc608_lib.atecc_handler_verify.argtypes = [c_int, POINTER(c_uint8), POINTER(c_uint8), POINTER(c_uint8)]
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atecc608_lib.atecc_handler_verify.restype = c_int
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def print_hex_buffer(input):
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print(" ".join(f"{x:02X}" for x in input))
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def write_atecc_config():
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status = atecc608_lib.atecc_handler_init(0xC0)
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if status:
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print(f"atecc_handler_init Fail! {status}")
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return
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ECCX08_DEFAULT_CONFIGURATION_VALS = (c_uint8 * 112)() # Adjust the size accordingly
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status = atecc608_lib.atecc_handler_write_configuration(ECCX08_DEFAULT_CONFIGURATION_VALS, 112)
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if status:
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print(f"atecc_handler_write_configuration Fail! {status}")
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return
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status = atecc608_lib.atecc_handler_lock_zone(0)
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if status:
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print(f"atecc_handler_lock_zone Fail! {status}")
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return
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def general_test():
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status = atecc608_lib.atecc_handler_init(0xC0)
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if status:
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print(f"atecc_handler_init Fail! {status}")
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return 0
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slotID = 1
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pub_key = (c_uint8 * 64)()
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status = atecc608_lib.atecc_handler_genkey(slotID, pub_key)
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if status:
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print(f"atecc_handler_genkey Fail! {status}")
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return 0
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print("Pub key generated:")
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print_hex_buffer(pub_key)
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priv_key = (c_uint8 * 36)(
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0x00, 0x00, 0x00, 0x00,
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0x39, 0xac, 0x9b, 0xf9, 0x17, 0x1d, 0xe8, 0x6f, 0xfa, 0x77, 0xe0, 0xb9, 0x05, 0x0b, 0xf6, 0xe0,
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0x6a, 0x2c, 0x1b, 0xc1, 0x76, 0x79, 0x36, 0xe6, 0xc7, 0x45, 0x79, 0xe4, 0x26, 0xa4, 0x47, 0x5f
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)
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status = atecc608_lib.atecc_handler_inject_priv_key(slotID, priv_key)
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if status:
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print(f"atecc_handler_inject_priv_key Fail! {status}")
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return 0
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status = atecc608_lib.atecc_handler_get_public_key(slotID, pub_key)
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if status:
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print(f"atecc_handler_get_public_key Fail! {status}")
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return 0
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print("Pub key:")
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print_hex_buffer(pub_key)
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signature = (c_uint8 * 64)()
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msg = (c_uint8 * 32)(
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0xc8, 0x90, 0xf8, 0x65, 0xf3, 0xb0, 0x5f, 0x78, 0x27, 0x03, 0x4a, 0xae, 0x6a, 0xc2, 0x5c, 0xd5,
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0xcb, 0xca, 0x5d, 0x25, 0xeb, 0x0f, 0x0c, 0x35, 0xdf, 0x5d, 0x33, 0x90, 0x3e, 0x08, 0xfa, 0xbe
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)
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status = atecc608_lib.atecc_handler_sign(slotID, msg, signature)
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if status:
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print(f"atecc_handler_sign Fail! {status}")
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return 0
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print("Signature:")
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print_hex_buffer(signature)
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status = atecc608_lib.atecc_handler_verify(slotID, msg, signature, pub_key)
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if status:
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print(f"atecc_handler_verify Fail! {status}")
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return 0
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print("TEST ENDED SUCCESSFULLY!")
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return 0
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if __name__ == "__main__":
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# write_atecc_config()
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# Uncomment the following line to run the general test
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general_test()
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