Problem when using OpenSSL in the phone

sfaei_Ahmed

Hello, I have built a project that uses a qt network and works without problems in the desktop and when I convert it to Android, it also works, but if I click on the button that sends the data to the server, this error occurs and no data is sent.

SGaist

Hi and welcome to devnet,

Did you include the OpenSSL libraries in your apk ?

Ronel_qtmaster

@sfaei_Ahmed Just add android openssl libraries to your project.
here is the guide https://github.com/KDAB/android_openssl
I hope that it helps

sfaei_Ahmed

I included it inside the cmakelist.txt file, but I don't know how to include it in the apk file.

Ronel_qtmaster

@sfaei_Ahmed first of all you have wrongly included it in cmakelist. second of all i already gave you the solution in the link above. There are guidelines for including openssl libs in cmake projects. Just take your time and read carefully.

sfaei_Ahmed

@Ronel_qtmaster I tried, but the problem is not solved. Please, if there are any projects or examples in which it is used, send it to me.

SGaist

What exactly do you have now ?
Did you get any error message on build ?
Did you inspect the content of the APK ?

MarcoDC

@Ronel_qtmaster I recently had the same problem using Qt6.9:

E/linker  (21919): library "/system/lib/libcrypto.so" ("/system/lib/libcrypto.so") needed or dlopened by "/data/app/com.company.app--EodNGlgEtHINhQ6rIRNedQ==/lib/arm64/libQt6Core_arm64-v8a.so" is not accessible for the namespace: [name="classloader-namespace", ld_library_paths="", default_library_paths="/data/app/com.company.app--EodNGlgEtHINhQ6rIRNedQ==/lib/arm64:/data/app/com.company.app--EodNGlgEtHINhQ6rIRNedQ==/base.apk!/lib/arm64-v8a", permitted_paths="/data:/mnt/expand:/data/data/com.company.app"]
W/qt.tlsbackend.ossl(21919): Failed to load libssl/libcrypto.
W/AudioCapabilities(21919): Unsupported mime audio/ac4
W/AudioCapabilities(21919): Unsupported mime audio/x-ima
W/qt.network.ssl(21919): No functional TLS backend was found
W/qt.network.ssl(21919): No TLS backend is available
...

and stumbled across your posted Link: https://github.com/KDAB/android_openssl
(I also think the same information are present in the official Qt doc: https://doc.qt.io/qt-6/android-openssl-support.html)
However I either used the command add_android_openssl_libraries(${PROJECT_NAME}) wrong or did forget something because I get an error when running CMake that this is not a known command:

CMake Error at CMakeLists.txt:279 (add_android_openssl_libraries):
[cmake]   Unknown CMake command "add_android_openssl_libraries".

I also tried to add the extra libraries as mentioned

set_target_properties(<target_name> PROPERTIES
QT_ANDROID_EXTRA_LIBS "<path_to_libs_dir>/libcrypto_3.so" "<path_to_libs_dir>/libssl_3.so"
)

like

set_target_properties(${PROJECT_NAME} PROPERTIES
    QT_ANDROID_EXTRA_LIBS
    "${SSL_ROOT_PATH}/ssl_3/${CMAKE_ANDROID_ARCH_ABI}/libcrypto_3.so"
    "${SSL_ROOT_PATH}/ssl_3/${CMAKE_ANDROID_ARCH_ABI}/libssl_3.so"
)

but this only led to

CMake Error at CMakeLists.txt:274 (set_target_properties):
[cmake]   set_target_properties called with incorrect number of arguments.

when trying to run it.

However this post https://forum.qt.io/topic/160405/cmake-equivalent-for-qmake-s-android_extra_libs/3 made me aware that

The values in QT_ANDROID_EXTRA_LIBS need to be separated by a semicolon.

and also without a newline in between which finally made me come up with

# Android for TLS backend
include(${ANDROID_SDK_ROOT}/android_openssl/CMakeLists.txt) # this sets OPENSSL_ROOT_DIR and ANDROID_EXTRA_LIBS however I seem to need set *QT_*ANDROID_EXTRA_LIBS

set_target_properties(${PROJECT_NAME} PROPERTIES
    QT_ANDROID_EXTRA_LIBS
    "${SSL_ROOT_PATH}/ssl_3/${CMAKE_ANDROID_ARCH_ABI}/libcrypto_3.so;${SSL_ROOT_PATH}/ssl_3/${CMAKE_ANDROID_ARCH_ABI}/libssl_3.so"
)

or even just

# Android for TLS backend
set_target_properties(${PROJECT_NAME} PROPERTIES
    QT_ANDROID_EXTRA_LIBS
    "${ANDROID_SDK_ROOT}/android_openssl/ssl_3/${CMAKE_ANDROID_ARCH_ABI}/libcrypto_3.so;${ANDROID_SDK_ROOT}/android_openssl/ssl_3/${CMAKE_ANDROID_ARCH_ABI}/libssl_3.so"
)

Is this a bug in Qt/QtCreator or just an error in the documentation? Where could I report this?