Description
I'm trying to use the built-in pico_mbedtls library to use Mbed TLS to encrypt data using AES-XTS.
However, no matter what I try, the result remains same: no error when compiling my code, but an error at linking because it cannot find the XTS-related symbols.
I have tried adding the MBEDTLS_CIPHER_MODE_XTS=1 define in every possible way: into CMAKE_C_FLAGS, inside mbedtls_config.h, with add_compile_definitions(...) and both target_compile_definitions(pico_mbedtls_crypto INTERFACE ...) and target_compile_definitions(pico_mbedtls INTERFACE ...).
/path/to/ld: CMakeFiles/path/to/kmain.c.o: in function `aes256_xts_test':
/path/to/bench.c:76:(.text.aes256_xts_test+0x10): undefined reference to `mbedtls_aes_xts_init'
/path/to/ld: /path/to/bench.c:77:(.text.aes256_xts_test+0x1c): undefined reference to `mbedtls_aes_xts_setkey_enc'
/path/to/ld: /path/to/bench.c:83:(.text.aes256_xts_test+0x46): undefined reference to `mbedtls_aes_crypt_xts'
/path/to/ld: /path/to/bench.c:87:(.text.aes256_xts_test+0x5a): undefined reference to `mbedtls_aes_xts_setkey_dec'
/path/to/ld: /path/to/bench.c:93:(.text.aes256_xts_test+0x7e): undefined reference to `mbedtls_aes_crypt_xts'
/path/to/ld: /path/to/bench.c:104:(.text.aes256_xts_test+0xa4): undefined reference to `mbedtls_aes_xts_free'
collect2: error: ld returned 1 exit status
(yes, I am importing bench.c directly from kmain.c without using a header file as this is a temporary test that will get removed afterwards)
The relevant parts of my CMakeLists.txt are the following (with the project name replaced with ProjectNameHere):
cmake_minimum_required(VERSION 3.13)
include(pico_sdk_import.cmake)
set(CMAKE_C_STANDARD 11)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
project(ProjectNameHere)
pico_sdk_init()
target_compile_definitions(pico_mbedtls_crypto INTERFACE MBEDTLS_CIPHER_MODE_XTS=1)
target_compile_definitions(pico_mbedtls INTERFACE MBEDTLS_CIPHER_MODE_XTS=1)
set(MBEDTLS_USER_CONFIG_FILE "${CMAKE_CURRENT_LIST_DIR}/src/mbedtls_config.h")
set(PICO_MBEDTLS_CONFIG_FILE "${CMAKE_CURRENT_LIST_DIR}/src/mbedtls_config.h")
add_compile_definitions(MBEDTLS_CIPHER_MODE_XTS=1)
add_executable(ProjectNameHere
src/kmain.c
)
target_link_libraries(ProjectNameHere
pico_stdio pico_stdlib pico_rand
hardware_exception hardware_watchdog hardware_clocks
pico_sha256 pico_mbedtls
)
target_include_directories(ProjectNameHere PRIVATE src/)
pico_enable_stdio_usb(ProjectNameHere 1)
pico_enable_stdio_uart(ProjectNameHere 1)
pico_set_program_name(ProjectNameHere "Project Name Here")
pico_set_program_version(ProjectNameHere "1.0")
pico_add_extra_outputs(ProjectNameHere)Is there something wrong in my end, or is this a shortcoming of the SDK's design?
Thanks in advance,
Ainara Garcia