sha1_test.c

/*
 *  Calculate SHA1
 *  @Compile with -lcrypto
 *  _________________________________________________________________
 *  |Openssl MacOs install                                          |
 *  -----------------------------------------------------------------
 *  |brew install openssl                                           |
 *  |brew link --force openssl                                      |
 *  |ln -s /usr/local/opt/openssl/include/openssl /usr/local/include|
 *  -----------------------------------------------------------------
 *
 *  Francesco Accardi
 */



#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/sha.h>

int main(){
    
    
    char data[] = "test";
    size_t length = strlen(data);
    
    unsigned char hash[SHA_DIGEST_LENGTH];
    SHA1((const unsigned char*)data, length, hash);
    // hash now contains the 20-byte SHA-1 hash
    
    for(int i=0;i<SHA_DIGEST_LENGTH;i++){
        printf("%02x", hash[i]);
    }
    printf("\n");
}