QCA on Android

Marek

Hi
I need OpenPGP to encrypt password, so I've choosend QCA (Qt Cryptographic Architecture)
https://github.com/KDE/qca
On Linux there is no problem, for Android I did cross compiled it with command:

cmake . -DCMAKE_SYSTEM_NAME=Android -DCMAKE_TOOLCHAIN_FILE=/opt/Android/Ndk/android-ndk-r20/build/cmake/android.toolchain.cmake -DQt5_DIR=/opt/Felgo/Felgo/android_armv7/lib/cmake/Qt5/ -DQt5Core_DIR=/opt/Felgo/Felgo/android_armv7/lib/cmake/Qt5Core/ -DQt5Test_DIR=/opt/Felgo/Felgo/android_armv7/lib/cmake/Qt5Test/ -DQt5Network_DIR=/opt/Felgo/Felgo/android_armv7/lib/cmake/Qt5Network/ -DANDROID_PLATFORM=android-29 -DCMAKE_INSTALL_PREFIX=/usr/local/android -DUSE_RELATIVE_PATHS=ON

Config says the package relocatable

-- Check for working C compiler: /opt/Android/Ndk/android-ndk-r20/toolchains/llvm/prebuilt/linux-x86_64/bin/clang
-- Check for working C compiler: /opt/Android/Ndk/android-ndk-r20/toolchains/llvm/prebuilt/linux-x86_64/bin/clang -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /opt/Android/Ndk/android-ndk-r20/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++
-- Check for working CXX compiler: /opt/Android/Ndk/android-ndk-r20/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Deprecation Warning at CMakeLists.txt:19 (cmake_policy):
  The OLD behavior for policy CMP0042 will be removed from a future version
  of CMake.

  The cmake-policies(7) manual explains that the OLD behaviors of all
  policies are deprecated and that a policy should be set to OLD only under
  specific short-term circumstances.  Projects should be ported to the NEW
  behavior and not rely on setting a policy to OLD.


-- Found Doxygen: /usr/bin/doxygen (found version "1.8.13") found components:  doxygen dot 
-- Installed package is relocatable
-- Checking for certstore..
-- Found system certstore
-- certstore path: /etc/ssl/certs/ca-certificates.crt
-- Looking for include file sys/filio.h
-- Looking for include file sys/filio.h - not found
-- Performing Test MLOCK_TAKES_VOID
-- Performing Test MLOCK_TAKES_VOID - Success
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.29") 
-- Checking for module 'botan-2'
--   No package 'botan-2' found
-- Checking for module 'nss'
--   No package 'nss' found
-- Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the system variable OPENSSL_ROOT_DIR (missing: OPENSSL_CRYPTO_LIBRARY OPENSSL_INCLUDE_DIR) (Required is at least version "1.1.1")
-- Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the system variable OPENSSL_ROOT_DIR (missing: OPENSSL_CRYPTO_LIBRARY OPENSSL_INCLUDE_DIR) 
-- Checking for one of the modules 'libpkcs11-helper-1'

Plugins:
  qca-botan off
  qca-cyrus-sasl off
  qca-gcrypt off
  qca-gnupg on
  qca-logger on
  qca-nss off
  qca-ossl off
  qca-pkcs11 off
  qca-softstore on

QCA prefix is /usr/local/android
Plugins will be installed to /usr/local/android/lib/qca-qt5
Binary will be installed to /usr/local/android/bin
Library will be installed to /usr/local/android/lib
Public headers will be installed to /usr/local/android/include/Qca-qt5
Private headers will be installed to /usr/local/android/include/Qca-qt5
Feature file will be installed to /usr/local/android/mkspecs/features
Documentation will be installed to /usr/local/android/share/doc/qca-qt5/html
Man page will be installed to /usr/local/android/share/man
Pkg-config file will be installed to /usr/local/android/lib/pkgconfig

-- Configuring done
-- Generating done

I have copied libraries into android/libs/armeabi-v7a/ linking and installing into Android device works fine, there are 3 plugins in crypto directory, visible in android-build directory:

libqca-gnupg.so
libqca-logger.so
libqca-softstore.so

But when app starts is does not support any of these plugins

    QCA::Initializer init;
    if(QCA::isSupported("logger")) {
        qDebug()<<"BackEnd::encrypt logger supported";
    }
    else {
        qDebug()<<"BackEnd::encrypt logger NOT supported";
    }
    if(QCA::isSupported("softstore")) {
        qDebug()<<"BackEnd::encrypt softstore supported";
    }
    else {
        qDebug()<<"BackEnd::encrypt softstore NOT supported";
    }
    if(QCA::isSupported("openpgp")) {
        qDebug()<<"BackEnd::encrypt openpgp supported";
    }
    else {
        qDebug()<<"BackEnd::encrypt openpgp NOT supported, return";
        return;
    }

result is:

BackEnd::encrypt logger NOT supported
BackEnd::encrypt softstore NOT supported
BackEnd::encrypt openpgp NOT supported, return

Can someone give me some hint ? What is worying me is this sentence from QCA changes list

 - qca-gnupg: try both gpg and gpg2 to find gnupg executable

if it is using command from OS then it will not work on Android ?

Best Regards
Marek

Marek

When I unzip APK file I can see that in lib/armeabi-v7a/ there is file libqca-qt5.so

file lib/armeabi-v7a/libqca-qt5.so 
lib/armeabi-v7a/libqca-qt5.so: ELF 32-bit LSB shared object, ARM, EABI5 version 1 (SYSV), dynamically linked, BuildID[sha1]=70b166ed2526bff0c5c8c365f2ef585ec73a6440, stripped

But there is no subdirectory "crypto" or any other that I have placed in android/libs/armeabi-v7a
How to tell QtCreator to include subdirectories from armeabi-v7a into APK ?

Best Regards
Marek

SGaist

Hi,

The Androïd deployment process is described here.

Marek

@SGaist thanks, somehow I can't make it work
There is some issue with gradle here
"fileTree() does not import the subdirectory"
https://github.com/gradle/gradle/issues/2394
So maybe it is not possible to include subdirectories ?

Best
Marek

SGaist

@Marek said in QCA on Android:

So maybe it is not possible to include subdirectories ?

That I do not know sorry.

It looks like it should be somehow possible. See this git gist.

Marek

@SGaist It looks like they are creating files instead of directories like this:
libplugins_crypto_libqca-ossl.so
So I created mine in the same manner
libplugins_crypto_libqca-gnupg.so
But QCA still says OpenPGP is not supported. Maybe it needs some underlying package like gnuPG to work. I have filed bug report to ask for this
https://bugs.kde.org/show_bug.cgi?id=432142

Thanks for help
Marek

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QCA on Android