Android - undefined reference to cryptopp

Question

I successfully compiled and executed Cryptopp in IOS but i really struggling to make work it in android.

Here i am using Cryptopp 5.6.3, NDK r10e and android studio 1.5 , I can successfully build libcryptopp.so through ndk-build but it throughs number of errors like undefined reference to 'vtable for CryptoPP::AutoSeededX917RNG' when i make rebuild through android studio.

In Android.mk

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := crypt_user
LOCAL_SRC_FILES := crypt_user.cpp
LOCAL_SHARED_LIBRARIES := cryptopp

include $(BUILD_SHARED_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE := cryptopp
LOCAL_SRC_FILES := $(TARGET_ARCH_ABI)/libcryptopp.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include

include $(PREBUILT_SHARED_LIBRARY)

in Application.mk

APP_ABI := armeabi
APP_CPPFLAGS += -fexceptions -frtti
APP_STL := stlport_shared
#APP_STL := gnustl_shared

in build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.0"

    defaultConfig {
        applicationId "com.kasbah.jeeva.ndklearning"
        minSdkVersion 16
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"

        ndk {
            moduleName = "crypt_user"
            cFlags("-fexceptions")
            stl = "stlport_shared"
        }

    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            debuggable true
            jniDebuggable true
        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.1.1'
    compile 'com.android.support:design:23.1.1'
}

In crypt_user.cpp

#include <jni.h>
#include "../cryptopp/include/cryptlib.h"

#include "../cryptopp/include/osrng.h"
//using CryptoPP::AutoSeededRandomPool;
using CryptoPP::AutoSeededX917RNG;

#include "../cryptopp/include/aes.h"
using CryptoPP::AES;

#ifdef __cplusplus
extern "C" {
#endif
jlong Java_com_kasbah_jeeva_ndklearning_MainActivity_fun
    (JNIEnv* env, jobject o, jint i) {

    AutoSeededX917RNG<AES> rng;

  long long t = CryptoPP::INFINITE_TIME / i;
  return t;
}
#ifdef __cplusplus
}
#endif

I can compile it successfully when i didnt use any cryptopp related code.

Please help me to solve this problem because i am fighting with this for more than 2 weeks..

Answer 1

... number of errors like undefined reference to 'vtable for CryptoPP::AutoSeededX917RNG'

Use nm to ensure the symbol is present:

$ arm-linux-androideabi-nm -D --demangle libcryptopp.so | grep AutoSeededX917RNG | sed 's|CryptoPP::||g'
00181ec4 W AutoSeededX917RNG<Rijndael>::IncorporateEntropy(unsigned char const*, unsigned int)
0017d728 W AutoSeededX917RNG<Rijndael>::GenerateIntoBufferedTransformation(BufferedTransformation&, std::string const&, unsigned long long)
00181c18 W AutoSeededX917RNG<Rijndael>::Reseed(unsigned char const*, unsigned int, unsigned char const*, unsigned char const*)
00181ddc W AutoSeededX917RNG<Rijndael>::Reseed(bool, unsigned char const*, unsigned int)
00181e80 W AutoSeededX917RNG<Rijndael>::AutoSeededX917RNG(bool, bool)
00181e80 W AutoSeededX917RNG<Rijndael>::AutoSeededX917RNG(bool, bool)
00169d90 W AutoSeededX917RNG<Rijndael>::~AutoSeededX917RNG()
00169d6c W AutoSeededX917RNG<Rijndael>::~AutoSeededX917RNG()
00169d6c W AutoSeededX917RNG<Rijndael>::~AutoSeededX917RNG()
0017d724 W AutoSeededX917RNG<Rijndael>::CanIncorporateEntropy() const
0023336c D typeinfo for AutoSeededX917RNG<Rijndael>
001fe0bc R typeinfo name for AutoSeededX917RNG<Rijndael>
00232308 V vtable for AutoSeededX917RNG<Rijndael>

---

in Application.mk
...

Below is what my Android.mk looks like for a shared object that provides random numbers. You can find it on GitHub at Android-PRNG. Notice the STLport stuff is first, the Crypto++ stuff is second, and then the PRNG library is third.

The PRNG library is simple. It contains one file - libprng.cpp. It samples sensors to develop seeds for a random number generator. Android Java calls into the PRNG library.

LOCAL_PATH := $(call my-dir)

# NDK_DEBUG_IMPORTS := 1

#########################################################
# STLport library
include $(CLEAR_VARS)

STLPORT_INCL     := /opt/android-ndk-r10d/sources/cxx-stl/stlport/stlport
STLPORT_LIB      := /opt/android-ndk-r10d/sources/cxx-stl/stlport/libs/$(TARGET_ARCH_ABI)

LOCAL_MODULE := stlport_shared
LOCAL_SRC_FILES := $(STLPORT_LIB)/libstlport_shared.so

LOCAL_EXPORT_CPPFLAGS :=
LOCAL_EXPORT_C_INCLUDES := $(STLPORT_INCL)

include $(PREBUILT_SHARED_LIBRARY)

LOCAL_SHARED_LIBRARIES  := stlport_shared

#########################################################
# Crypto++ library
include $(CLEAR_VARS)

CRYPTOPP_INCL   := /usr/local/cryptopp/android-$(TARGET_ARCH_ABI)/include
CRYPTOPP_LIB    := /usr/local/cryptopp/android-$(TARGET_ARCH_ABI)/lib

LOCAL_MODULE       := cryptopp
LOCAL_SRC_FILES    := $(CRYPTOPP_LIB)/libcryptopp.so

LOCAL_EXPORT_CPPFLAGS := -Wno-unused-parameter -Wno-unused-variable -Wno-unused-function
LOCAL_EXPORT_C_INCLUDES := $(CRYPTOPP_INCL) $(CRYPTOPP_INCL)/cryptopp

include $(PREBUILT_SHARED_LIBRARY)

LOCAL_SHARED_LIBRARIES  := cryptopp

#########################################################
# PRNG library
include $(CLEAR_VARS)

APP_STL         := stlport_shared
APP_MODULES     := prng stlport_shared cryptopp

# My ass... LOCAL_EXPORT_C_INCLUDES is useless
LOCAL_C_INCLUDES   := $(STLPORT_INCL) $(CRYPTOPP_INCL)

LOCAL_CPP_FEATURES := rtti exceptions

LOCAL_CPP_FLAGS    := -Wno-unused-parameter -Wno-unused-variable -Wno-unused-function
LOCAL_CPP_FLAGS    += -Wl,--exclude-libs,ALL

LOCAL_LDLIBS            := -llog -landroid
LOCAL_SHARED_LIBRARIES  := cryptopp stlport_shared

LOCAL_MODULE    := prng
LOCAL_SRC_FILES := libprng.cpp

include $(BUILD_SHARED_LIBRARY)

---

The GitHub project builds fine using ndk-build:

~$ cd Android-PRNG
Android-PRNG$ ndk-build
Android NDK: WARNING: APP_PLATFORM android-14 is larger than android:minSdkVersion 9 in ./AndroidManifest.xml    
[armeabi] Gdbserver      : [arm-linux-androideabi-4.8] libs/armeabi/gdbserver
[armeabi] Gdbsetup       : libs/armeabi/gdb.setup
[x86] Gdbserver      : [x86-4.8] libs/x86/gdbserver
[x86] Gdbsetup       : libs/x86/gdb.setup
[mips] Gdbserver      : [mipsel-linux-android-4.8] libs/mips/gdbserver
[mips] Gdbsetup       : libs/mips/gdb.setup
[armeabi-v7a] Gdbserver      : [arm-linux-androideabi-4.8] libs/armeabi-v7a/gdbserver
[armeabi-v7a] Gdbsetup       : libs/armeabi-v7a/gdb.setup
[x86_64] Gdbserver      : [x86_64-4.9] libs/x86_64/gdbserver
[x86_64] Gdbsetup       : libs/x86_64/gdb.setup
[armeabi] Prebuilt       : libcryptopp.so <= /usr/local/cryptopp/android-armeabi/lib/
[armeabi] Install        : libcryptopp.so => libs/armeabi/libcryptopp.so
[armeabi] Compile++ thumb: prng <= libprng.cpp
[armeabi] Prebuilt       : libstlport_shared.so <= /opt/android-ndk-r10d/sources/cxx-stl/stlport/libs/armeabi/
[armeabi] StaticLibrary  : libstdc++.a
[armeabi] SharedLibrary  : libprng.so
[armeabi] Install        : libprng.so => libs/armeabi/libprng.so
[armeabi] Install        : libstlport_shared.so => libs/armeabi/libstlport_shared.so
[x86] Prebuilt       : libcryptopp.so <= /usr/local/cryptopp/android-x86/lib/
[x86] Install        : libcryptopp.so => libs/x86/libcryptopp.so
[x86] Compile++      : prng <= libprng.cpp
[x86] Prebuilt       : libstlport_shared.so <= /opt/android-ndk-r10d/sources/cxx-stl/stlport/libs/x86/
[x86] StaticLibrary  : libstdc++.a
[x86] SharedLibrary  : libprng.so
[x86] Install        : libprng.so => libs/x86/libprng.so
[x86] Install        : libstlport_shared.so => libs/x86/libstlport_shared.so
[mips] Prebuilt       : libcryptopp.so <= /usr/local/cryptopp/android-mips/lib/
[mips] Install        : libcryptopp.so => libs/mips/libcryptopp.so
[mips] Compile++      : prng <= libprng.cpp
[mips] Prebuilt       : libstlport_shared.so <= /opt/android-ndk-r10d/sources/cxx-stl/stlport/libs/mips/
[mips] StaticLibrary  : libstdc++.a
[mips] SharedLibrary  : libprng.so
[mips] Install        : libprng.so => libs/mips/libprng.so
[mips] Install        : libstlport_shared.so => libs/mips/libstlport_shared.so
[armeabi-v7a] Prebuilt       : libcryptopp.so <= /usr/local/cryptopp/android-armeabi-v7a/lib/
[armeabi-v7a] Install        : libcryptopp.so => libs/armeabi-v7a/libcryptopp.so
[armeabi-v7a] Compile++ thumb: prng <= libprng.cpp
[armeabi-v7a] Prebuilt       : libstlport_shared.so <= /opt/android-ndk-r10d/sources/cxx-stl/stlport/libs/armeabi-v7a/
[armeabi-v7a] StaticLibrary  : libstdc++.a
[armeabi-v7a] SharedLibrary  : libprng.so
[armeabi-v7a] Install        : libprng.so => libs/armeabi-v7a/libprng.so
[armeabi-v7a] Install        : libstlport_shared.so => libs/armeabi-v7a/libstlport_shared.so
[x86_64] Prebuilt       : libcryptopp.so <= /usr/local/cryptopp/android-x86_64/lib/
[x86_64] Install        : libcryptopp.so => libs/x86_64/libcryptopp.so
[x86_64] Compile++      : prng <= libprng.cpp
[x86_64] Prebuilt       : libstlport_shared.so <= /opt/android-ndk-r10d/sources/cxx-stl/stlport/libs/x86_64/
[x86_64] StaticLibrary  : libstdc++.a
[x86_64] SharedLibrary  : libprng.so
[x86_64] Install        : libprng.so => libs/x86_64/libprng.so
[x86_64] Install        : libstlport_shared.so => libs/x86_64/libstlport_shared.so