Linux 无法链接 OpenSSL 代码
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Can't link OpenSSL code
提问by AlexandruC
I am trying to build an openssl simple program. Here is the complete code:
我正在尝试构建一个 openssl 简单程序。这是完整的代码：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "openssl/aes.h"
int main(int argc, char* argv[])
{
AES_KEY aesKey_;
unsigned char userKey_[16];
unsigned char in_[16];
unsigned char out_[16];
strcpy(userKey_,"0123456789123456");
strcpy(in_,"0123456789123456");
fprintf(stdout,"Original message: %s", in_);
AES_set_encrypt_key(userKey_, 128, &aesKey_);
AES_encrypt(in_, out_, &aesKey_);
AES_set_decrypt_key(userKey_, 128, &aesKey_);
AES_decrypt(out_, in_,&aesKey_);
fprintf(stdout,"Recovered Original message: %s", in_);
return 0;
}
I try to compile it using this command:
我尝试使用以下命令编译它：
gcc -I/home/aleksei/openSSL0.9.8/include -o app -L . -lssl -lcrypto tema1.c
and I get this:
我明白了：
/tmp/ccT1XMid.o: In function `main':
tema1.c:(.text+0x8d): undefined reference to `AES_set_encrypt_key'
tema1.c:(.text+0xa7): undefined reference to `AES_encrypt'
tema1.c:(.text+0xbf): undefined reference to `AES_set_decrypt_key'
tema1.c:(.text+0xd9): undefined reference to `AES_decrypt'
collect2: ld returned 1 exit status
I am under Ubuntu 10.04. How can I get this to work ?
我在 Ubuntu 10.04 下。我怎样才能让它工作？
采纳答案by indiv
You may be trying to statically link, but the -Loption and -lcryptoare looking for a file to link with dynamically. To statically link to a specific library, just specify your .afile on the compiler command line after all your source files.
您可能正在尝试静态链接，但该-L选项-lcrypto正在寻找要动态链接的文件。要静态链接到特定库，只需.a在所有源文件之后在编译器命令行上指定您的文件。
E.g.,
例如，
gcc -I/home/aleksei/openSSL0.9.8/include -o app tema1.c ./libcrypto.a
回答by lmiguelmh
For those of you who have this same problem but are using Windows, Mingw and this OpenSSL for Windows (at this time: Win32 OpenSSL v1.0.2a). You need to link to libeay32.athat is located in C:\OpenSSL-Win32\lib\MinGW\(after installing OpenSSL).
对于那些遇到同样问题但正在使用 Windows、Mingw 和适用于 Windows 的 OpenSSL（目前：Win32 OpenSSL v1.0.2a）的人。您需要链接到libeay32.a位于C:\OpenSSL-Win32\lib\MinGW\（安装 OpenSSL 后）。
In my case I am using CMake and the powerful CLion IDE, so I had to rename the library to libeay32.dll.abecause CMake wasn't locating the library. This is my CMakeLists.txt:
就我而言，我使用的是 CMake 和强大的 CLion IDE，因此我不得不将库重命名为 ，libeay32.dll.a因为 CMake 没有找到该库。这是我的 CMakeLists.txt：
cmake_minimum_required(VERSION 3.1)
project(openssl_1_0_2a)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
include_directories(C:\OpenSSL-Win32\include)
set(SOURCE_FILES main.cpp)
link_directories(C:\OpenSSL-Win32\lib\MinGW)
add_executable(openssl_1_0_2a ${SOURCE_FILES})
target_link_libraries(openssl_1_0_2a eay32)
I made the test with this example (which is borrowed from this answer):
我用这个例子进行了测试（这是从这个答案中借来的）：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "openssl/aes.h"
int main(int argc, char* argv[])
{
AES_KEY aesKey_;
unsigned char userKey_[16];
unsigned char in_[16] = {0};
unsigned char out_[16] = {0};
strcpy((char *) userKey_,"0123456789123456");
strcpy((char *) in_,"0123456789123456");
fprintf(stdout,"Original message: %s\n", in_);
AES_set_encrypt_key(userKey_, 128, &aesKey_);
AES_encrypt(in_, out_, &aesKey_);
AES_set_decrypt_key(userKey_, 128, &aesKey_);
AES_decrypt(out_, in_,&aesKey_);
fprintf(stdout,"Recovered Original message: %s XXX \n", in_);
return 0;
}
