Cocos2d-x에서 OpenSSL 사용 (Android)

Android용 OpenSSL을 빌드하고 사용하는 방법 노트
※ 패스는 각각 자신의 환경에 맞추어

실행된 환경

OS X 10.10.3

Cocos2d-x v3.6

Android NDK r10d

소스 코드를 저장소에서 복제

mkdir OpenSSL
cd OpenSSL
git clone -b OpenSSL_1_0_2a git://github.com/openssl/openssl.git src

Android NDK Standalone Toolchain 만들기

$NDK_ROOT/build/tools/make-standalone-toolchain.sh --arch=arm --install-dir=toolchain --platform=android-19

빌드

armeabi

cd src
export ANDROID_DEV=$NDK_ROOT/platforms/android-19/arch-arm/usr
CROSS_COMPILE_PREFIX=/Users/ditabashi/OpenSSL/toolchain/bin/arm-linux-androideabi-
PREFIX=/Users/ditabashi/OpenSSL/dest/armeabi
./Configure --prefix=$PREFIX --cross-compile-prefix=$CROSS_COMPILE_PREFIX android threads no-shared
make -s && make install

armeabi-v7a

PREFIX=/Users/ditabashi/OpenSSL/dest/armeabi-v7a
make clean
./Configure --prefix=$PREFIX --cross-compile-prefix=$CROSS_COMPILE_PREFIX android-armv7 threads no-shared
make -s && make install

Cocos2d-x 프로젝트에 추가

Android.mk의 내용

Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/$(TARGET_ARCH_ABI)/include

LOCAL_MODULE := crypto
LOCAL_SRC_FILES := $(TARGET_ARCH_ABI)/lib/libcrypto.a
include $(PREBUILT_STATIC_LIBRARY)

LOCAL_MODULE := ssl
LOCAL_SRC_FILES := $(TARGET_ARCH_ABI)/lib/libssl.a
include $(PREBUILT_STATIC_LIBRARY)

프로젝트의 Android.mk 수정

Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

$(call import-add-path,$(LOCAL_PATH)/../../cocos2d)
$(call import-add-path,$(LOCAL_PATH)/../../cocos2d/external)
$(call import-add-path,$(LOCAL_PATH)/../../cocos2d/cocos)

# **これを追加**
$(call import-add-path,$(LOCAL_PATH)/../../Libraries)

LOCAL_MODULE := cocos2dcpp_shared

LOCAL_MODULE_FILENAME := libcocos2dcpp

LOCAL_SRC_FILES := hellocpp/main.cpp \
                   ../../Classes/AppDelegate.cpp \
                   ../../Classes/HelloWorldScene.cpp

LOCAL_C_INCLUDES := $(LOCAL_PATH)/../../Classes

# _COCOS_HEADER_ANDROID_BEGIN
# _COCOS_HEADER_ANDROID_END


LOCAL_STATIC_LIBRARIES := cocos2dx_static

# **これを追加**
LOCAL_STATIC_LIBRARIES += crypto ssl

# _COCOS_LIB_ANDROID_BEGIN
# _COCOS_LIB_ANDROID_END

include $(BUILD_SHARED_LIBRARY)

$(call import-module,.)

# _COCOS_LIB_IMPORT_ANDROID_BEGIN
# _COCOS_LIB_IMPORT_ANDROID_END

# **これを追加**
$(call import-module,OpenSSL/Android)

이미지를 암호화해보기

openssl enc -e -aes-128-ecb -K 61616161616161616161616161616161 -in HelloWorld.png -out HelloWorld.dat

※ 61616161616161616161616161616161은 "aaaaaaaaaaaaaaaa"의 16진수 표현

해독하여 표시

HelloWorldScene.cpp

#include <array>
#include <vector>
#include <openssl/evp.h>

cocos2d::Sprite *createSpriteFromEncryptedFile(const std::string &fileName) {
    static const std::array<unsigned char, 16> KEY = {'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a',
                                                      'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a'};

    auto fullPath = cocos2d::FileUtils::getInstance()->fullPathForFilename(fileName);
    if (auto texture = cocos2d::Director::getInstance()->getTextureCache()->getTextureForKey(fullPath)) {
        return cocos2d::Sprite::createWithTexture(texture);
    }

    auto data = cocos2d::FileUtils::getInstance()->getDataFromFile(fullPath);

    EVP_CIPHER_CTX context;
    EVP_DecryptInit(&context, EVP_aes_128_ecb(), KEY.data(), nullptr);

    std::vector<unsigned char> buff(data.getSize());
    int len;
    int outLen = 0;
    if (!EVP_DecryptUpdate(&context, buff.data(), &len, data.getBytes(), static_cast<int>(data.getSize()))) {
        return nullptr;
    }
    outLen += len;

    if (!EVP_DecryptFinal(&context, buff.data() + len, &len)) {
        return nullptr;
    }
    outLen += len;

    cocos2d::Image image;
    image.initWithImageData(buff.data(), outLen);

    auto texture = cocos2d::Director::getInstance()->getTextureCache()->addImage(&image, fullPath);
    return cocos2d::Sprite::createWithTexture(texture);
}

HelloWorldScene.cpp

    // add "HelloWorld" splash screen"
    auto sprite = createSpriteFromEncryptedFile("HelloWorld.dat");
    // auto sprite = Sprite::create("HelloWorld.png");

오시마

이상을 정리해 쉘 스크립트로 해 GitHub에 두어 둡니다.
build-libssl-for-android.sh를 실행하면 같은 환경이라면 아마 잘 될 것입니다.
htps : // 기주 b. 코 m / Idai Suke / Hyd Roger Nim m / t Ree / Ma S r / Bui ld와 ls / Open s L