在GCC中链接libssl和libcrypto [重复]

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Errors that refer to a bunch of unresolved OpenSSL symbols that clearly exist? 1 answer

引用一堆明显存在的未解决的OpenSSL符号的错误? 1个答案

I'm attempting to use OpenSSL's EVP interface to do some encryption. I'm pretty sure my code is right, but I can't seem to get it to compile. I'm using GCC, and Ubuntu 32-bit precise with libssl-dev installed and at the latest version.

我正在尝试使用OpenSSL的EVP接口进行一些加密。我很确定我的代码是正确的,但我似乎无法编译它。我正在使用GCC,并且安装了libssl-dev的Ubuntu 32位精确版和最新版本。

The project currently consists of one file, program.c.

该项目目前包含一个文件program.c。

#include <openssl/evp.h>
...
i = EVP_BytesToKey(EVP_aes_256_cbc(), EVP_sha1() ... );
...
EVP_CIPHER_CTX_init(e_ctx);

among other various calls.

以及其他各种电话。

Here is how I invoke gcc:

这是我如何调用gcc:

gcc -Wall -g -lssl -lcrypto -o program program.c

Then I get output like this

然后我得到这样的输出

/home/andy/program/program.c:31: undefined reference to `EVP_sha1'
/home/andy/program/program.c:31: undefined reference to `EVP_aes_256_cbc'
/home/andy/program/program.c:31: undefined reference to `EVP_BytesToKey'
/home/andy/program/program.c:44: undefined reference to `EVP_CIPHER_CTX_init'

So the include is clearly working:

所以包含显然在起作用:

andy@ProgStation2:/usr/include$ find . | grep evp.h
./openssl/evp.h

Here is the output of locate libcrypto. My best guess is that this is a stupid location for it and is why my link is failing, so I tried -L/usr/lib/i386-linux-gnu before -lcrypto with no luck as well.

这是locate libcrypto的输出。我最好的猜测是,这是一个愚蠢的位置,这就是我的链接失败的原因,所以我在-lcrypto之前尝试了-L / usr / lib / i386-linux-gnu,但也没有运气。

/lib/i386-linux-gnu/libcrypto.so.1.0.0

I'm kind of stumped. If anyone wants to make me feel like a fool, I'd be very excited to figure out what i'm doing wrong!

我有点难过。如果有人想让我觉得自己像个傻瓜,我会非常兴奋地弄清楚我做错了什么!

2 个解决方案

#1

It turns out it was something stupid. In the linker step, I was using gcc -Wall -g -lssl -lcrypto -o program program.o. I needed to move the library links to after the object file I was linking, and put libssl before libcrypto:

事实证明这是一个愚蠢的事情。在链接器步骤中,我使用的是gcc -Wall -g -lssl -lcrypto -o program program.o。我需要将库链接移动到我链接的目标文件之后,并将libssl放在libcrypto之前:

gcc -Wall -g -o program program.o -lssl -lcrypto

#2

-1

Try including headers using -I option, Look into directory for library using -L and finally specifying the library name with -l

尝试使用-I选项包含标题,使用-L查看库的目录,最后使用-l指定库名

Just making guess here, please specify path based on actual location.

在这里猜猜,请根据实际位置指定路径。

gcc -g -Wall  -L/usr/lib -I/usr/include -lssl -lcrypto -o program program.c

Hope it may help.

希望它可能有所帮助。

#1

gcc -Wall -g -o program program.o -lssl -lcrypto

#2

-1