Crypto++ in Android(Java project)

This is Android side.

We can get libcryptocpp.so. Next is to use this library from Android side.

We need special settings to use libcryptocpp.so

Add Application.mk to build C++ env

Application.mk is appliction makefile common settings.
The contents is

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

These are common settings for C++ build

Examples

Prepared 2 directories under jni.

Top level Android.mk is following

include $(call all-subdir-makefiles)

Only calling sub directory Android.mk

cryptocpp is crytocpp core library and headers.
I put libcryptocpp.so under it.

Android.mk is following.

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

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

include $(PREBUILT_SHARED_LIBRARY)

This wraps libcrytocpp.so build.
All shared libraries move under armeabi including STL.
crypt_user has codes of this project, it is JNI codes.

This is header example

#include <jni.h>
#include <cryptlib.h>

#include <iostream>
#include <iomanip>

using namespace std;

#ifndef _Included_Crypt_User
#define _Included_Crypt_User

#ifdef __cplusplus
extern "C" {
#endif
// JNI method description
#ifdef __cplusplus
}
#endif
#endif

In JNI, we need define method in extern C in Android.

Problem

std:string part doesn’t work. So I gave up std:string codes.
Instead I use byte array and jbyteArray in Android
char * is also fine I thought.