How to link OpenSSL libraries in CMake Qt Android app?

Question

I have tried several options but still didn't link the libraries successfully. I have Qt Android CMake application and I need to link the libssl and libcrypto libraries. I have placed them in the poject /android_openssl/ANDROID_ABI/lib/ and for each ABI i have this:

And also the include folder is next to the abi folders. I have tried this solutions but I end up without this libraries to be linked:

I tried this possible solution and I got error:

add_library(ssl STATIC IMPORTED) add_library(crypto STATIC IMPORTED) set_target_properties(ssl PROPERTIES IMPORTED_LOCATION ${CMAKE_CURRENT_SOURCE_DIR}/android_openssl/${ANDROID_ABI}/lib/libssl.a) set_target_properties(crypto PROPERTIES IMPORTED_LOCATION ${CMAKE_CURRENT_SOURCE_DIR}/android_openssl/${ANDROID_ABI}/lib/libcrypto.a) add_library(MyApp SHARED ${PROJECT_SOURCES} ${PROJECT_HEADERS} ${PROJECT_RESOURCES} ) target_link_libraries(MyApp PRIVATE ssl crypto Qt5::Core Qt5::Quick Qt5::QuickControls2 Qt5::Sql Qt5::Network Qt5::Svg )

Error:

E linker : library "/system/lib/libcrypto.so" ("/system/lib/libcrypto.so") needed or dlopened by "/data/app/~~Xp7o_GB4MNRnsRrBx8X1Pw==/org.qtproject.example-VZ3Vyyfp8FGD1_RYb2Soug==/lib/x86/libQt5Core_x86.so" is not accessible for the namespace: [name="classloader-namespace", ld_library_paths="", default_library_paths="/data/app/~~Xp7o_GB4MNRnsRrBx8X1Pw==/org.qtproject.example-VZ3Vyyfp8FGD1_RYb2Soug==/lib/x86:/data/app/~~Xp7o_GB4MNRnsRrBx8X1Pw==/org.qtproject.example-VZ3Vyyfp8FGD1_RYb2Soug==/base.apk!/lib/x86", permitted_paths="/data:/mnt/expand:/data/user/0/org.qtproject.example"] W libMyApp_x86.so: qt.network.ssl: QSslSocket::connectToHostEncrypted: TLS initialization failed

Can you please tell me what I am doing wrong? I have found so much resources on this topic but still I am doing something wrong.

Also, I see that here I have static libraries for each abi .a and also I see .so.1.1. So which one I should link?

@AlanBirtles I have added erorr message that i got for second solution. For the first one there is no error I only see in app that data is not received from the server so libraries are not linked. — user13518368
– user13518368, Commented Dec 18, 2021 at 16:10
Static will probably make your life easier, the error is probably due to the missing symlink from libcrypto.so to libcrypto.so.1.1 — Alan Birtles
– Alan Birtles, Commented Dec 18, 2021 at 16:43
@AlanBirtles I have tried with static and got another error. I have updated the question with my last try. Do you have any suggestion what to try or have you encountered similar error? Thanks in advance. — user13518368
– user13518368, Commented Dec 18, 2021 at 21:16

Samuel Mira · Accepted Answer · 2022-02-16 13:49:28Z

By looking at the error it seems that "libQt5Core_x86.so" is looking for "libcrypto.so" and cannot find it. That is expected since OpenSSL builds ".so.1.1" library files.

To solve this there you should:

1 - Rebuild OpenSSL for Android without .1.1. There are some answers on Stack Overflow and scripts on Github to do this but running make SHLIB_VERSION_NUMBER= SHLIB_EXT=.so on newer versions of OpenSSL should do the trick. Any doubts for other android related stuff use this guide: https://doc.qt.io/qt-6/android-openssl-support.html#building-openssl-for-android

2 - Use Qt creator to get the OpenSSL handy include project as this screenshot shows. (This is a mac screenshot, but in Linux look for Tools > Options > Devices > Android > Android OpenSSL Settings

3 - Finally follow change CMakeLists.txt to use the project above and add the OpenSSL library files using QT_EXTRA_LIBS. Use this guide: https://doc.qt.io/qt-6/android-openssl-support.html#using-openssl-libraries-with-qt-for-android

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