无法链接OpenSSL代码

Question

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;
}

我尝试使用此命令编译它:

gcc -I/home/aleksei/openSSL0.9.8/include -o app -L . -lssl -lcrypto tema1.c

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

我在Ubuntu 10.04下.我怎样才能让它发挥作用？

Answer 1

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文件即可.

例如,

gcc -I/home/aleksei/openSSL0.9.8/include -o app tema1.c ./libcrypto.a