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.
The project currently consists of one file, 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.
Here is how I invoke gcc:
gcc -Wall -g -lssl -lcrypto -o program program.c
Then I get output like this
/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:
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.
/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!
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
:
gcc -Wall -g -o program program.o -lssl -lcrypto