在 android 项目中使用 libcryto.so 和 libssl.so? [英] use libcryto.so and libssl.so in an android project?

问题描述

我是 Android NDK 的初学者.我想基于 openssl 库构建一个 RSA 示例.首先，我在 Guardianproject 中使用 ndk-build 构建了 libssl.so 和 libcrypto.so 库.接下来，我创建了一个新的示例项目来集成 libary (libss.so & lybcryto.so).我在这个 post

I'm beginer to Android NDK. I want to build a RSA example base on openssl libary. First, I built libssl.so and libcrypto.so librairies with ndk-build in the guardianproject. Next, I create a new sample project to integrate libary (libss.so & lybcryto.so). I follow the same in this post

我的应用目录

TrialApp
|
|-->Activity.java (includes System.LoadLibrary calls)
|
|-->jni
    |-->TestJNI2.cpp
    |
    |-->Android.mk
    |
    |-->includes
    |   |
    |   |-->openssl (dir containing *.h files)
    |
    |-->precompiled
       |-->libssl.so
       |-->libcrypto.so

我的 android.mk:

My android.mk:

LOCAL_PATH := $(call my-dir)

# Prebuilt libssl
include $(CLEAR_VARS)
LOCAL_MODULE := ssl
LOCAL_SRC_FILES := precompiled/libssl.so
include $(PREBUILT_SHARED_LIBRARY)

# Prebuilt libcrypto
include $(CLEAR_VARS)
LOCAL_MODULE := crypto
LOCAL_SRC_FILES := precompiled/libcrypto.so
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)

c_includes := $(LOCAL_PATH)
cf_includes := includes/openssl

cf_includes := $(addprefix -Ijni/,$(cf_includes))

export_c_includes := $(c_includes)

LOCAL_MODULE := security
LOCAL_SRC_FILES := TestJNI2.cpp
LOCAL_CFLAGS += $(cf_includes)
LOCAL_EXPORT_C_INCLUDES := $(export_c_includes)
LOCAL_LDLIBS := -llog
LOCAL_LDLIBS += $(LOCAL_PATH)/precompiled/libssl.so
LOCAL_LDLIBS += $(LOCAL_PATH)/precompiled/libcrypto.so

include $(BUILD_SHARED_LIBRARY)

TestJNI2.cpp

TestJNI2.cpp

/* OpenSSL headers */

#include "openssl/bio.h"
#include "openssl/ssl.h"
#include "openssl/err.h"

/* Initializing OpenSSL */

void init_openssl(void){
    SSL_load_error_strings();
    ERR_load_BIO_strings();
    OpenSSL_add_all_algorithms();
}

然后当我用 ndk-build 构建时总是有这样的问题

Then when i build with ndk-build always have problems like this

/data/workspace/TestJNI2/jni/TestJNI2.cpp:3:25: error: openssl/bio.h: No such file or directory
/data/workspace/TestJNI2/jni/TestJNI2.cpp:4:25: error: openssl/ssl.h: No such file or directory
/data/workspace/TestJNI2/jni/TestJNI2.cpp:5:25: error: openssl/err.h: No such file or directory
/data/workspace/TestJNI2/jni/TestJNI2.cpp: In function 'void init_openssl()':
/data/workspace/TestJNI2/jni/TestJNI2.cpp:10: error: 'SSL_load_error_strings' was not declared in this scope
/data/workspace/TestJNI2/jni/TestJNI2.cpp:11: error: 'ERR_load_BIO_strings' was not declared in this scope
/data/workspace/TestJNI2/jni/TestJNI2.cpp:12: error: 'OpenSSL_add_all_algorithms' was not declared in this scope
make: *** [/data/workspace/TestJNI2/obj/local/armeabi/objs/security/TestJNI2.o] Error 1

谁能帮帮我?或者如何基于 openssl lib 构建示例 RSA 算法?

Can anyone help me? Or how to build an example RSA algorthim base on openssl lib?

推荐答案

您应该在脚本中为 libssl 和 libcrypto 构建静态库.如果不能，请重命名这些库(您可以在构建后执行此操作，同时复制到您的 precompiled 目录).原因是系统自带这些共享库的(可能不同的)版本，加载器将使用 /system/lib/libssl.so 和 /system/lib/libcrypto.so 而不是您的私人副本.

You should build static libraries for libssl and libcrypto in your script. If you can't, rename these libraries (you can do this after build, while copying to your precompiled directory). The reason is that the system comes with its own (probably different) version of these shared libraries, and the loader will use /system/lib/libssl.so and /system/lib/libcrypto.so instead of your private copies.

关于 Android.mk 文件，我为你稍微清理了一下(注意，我没有更改预构建的 LOCAL_MODULE 的名称，而是更改了名称LOCAL_MODULE 你终于构建了，因为 security 太通用了，也可能碰巧与某些设备上的系统库匹配):

Regarding the Android.mk file, I slightly cleaned it up for you (note that I did not change the names of prebuilt LOCAL_MODULEs, but changed the name of LOCAL_MODULE you finally build, because security is, well, too generic and could also happen to match a system library on some device):

LOCAL_PATH := $(call my-dir)

# Prebuilt libssl
include $(CLEAR_VARS)
LOCAL_MODULE := ssl
LOCAL_SRC_FILES := precompiled/libPrivateSsl.so
include $(PREBUILT_SHARED_LIBRARY)

# Prebuilt libcrypto
include $(CLEAR_VARS)
LOCAL_MODULE := crypto
LOCAL_SRC_FILES := precompiled/libPrivateCrypto.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE := PrivateSecurity
LOCAL_C_INCLUDES := includes
LOCAL_SRC_FILES := TestJNI2.cpp
LOCAL_LDLIBS := -llog
LOCAL_SHARED_LIBRARIES := ssl crypto

include $(BUILD_SHARED_LIBRARY)

不要忘记您的 Java 应该首先加载依赖项:

Don't forget that your Java should load the dependencies first:

{
    System.loadLibrary("PrivateSsl");
    System.loadLibrary("PrivateCrypto");
    System.loadLibrary("PrivateSecurity");
}

这篇关于在 android 项目中使用 libcryto.so 和 libssl.so?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！