undefined reference to `SHA1' in C

Question

I'm trying to compile this code written in C:

#include <stdio.h>
#include <stdlib.h>
#include <C:\OpenSSL-Win32\include\openssl\sha.h>
#include <string.h>

main() {
char data[] = "Hello, world!";
size_t length = strlen(data);

unsigned char hash[SHA_DIGEST_LENGTH];
SHA1(data, length, hash);
}

I'm using Dev-C++. It gives me the error : undefined reference to `SHA1'. I founded this post: Undefined reference to `SHA1' but I didn't solve the problem. Can anyone help me?

You need to link in a library that supplies the SHA1 function, the linker setting parts of the answer that you've linked to. — Rup, Nov 08 '18 at 16:58
I have already added the 2 '.a' in linker setting, what more? — MrCaptain Alex, Nov 08 '18 at 17:02
I just went to Project -> Project Option -> Parameters -> Add Library and selected the two '.a' — MrCaptain Alex, Nov 08 '18 at 17:54

score 2 · Answer 1 · edited Oct 27 '20 at 10:37

2

MrCaptain Alex, Rup and Barmar wrote what is the correct way, but in my case, I have Ubuntu, when I link, It's necesary add the library -L/usr/lib -lcrypto:

$ gcc -o executable_file source_file.c -L/usr/lib -lcrypto

That's all ;-)

edited Oct 27 '20 at 10:37

James Brown

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answered Sep 25 '19 at 16:32

steels

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undefined reference to `SHA1' in C

1 Answers1