#include <stdio.h>
#include <openssl/evp.h>

int main(int ac, char **av)
{
    if (ac != 2) {
        fprintf(stderr,"Usage: %s chaine\n",av[0]);
        exit(0);
    }

    EVP_MD_CTX mdctx;
    const EVP_MD *md;
    unsigned char md_value[EVP_MAX_MD_SIZE];
    int md_len,i;
    char *buf = (char *)malloc(EVP_MAX_MD_SIZE*sizeof(char));
    bzero(buf,EVP_MAX_MD_SIZE);

    OpenSSL_add_all_digests();

    md = EVP_get_digestbyname("md5");

    if (!md) {
        fprintf(stderr,"Cannot find md5 digest\n");
        free(buf);
        exit(0);
    }

    EVP_MD_CTX_init(&mdctx);
    EVP_DigestInit_ex(&mdctx,md,NULL);
    EVP_DigestUpdate(&mdctx,av[1],strlen(av[1]));
    EVP_DigestFinal_ex(&mdctx,md_value,&md_len);
    EVP_MD_CTX_cleanup(&mdctx);

    for (i=0;i<md_len;i++)
        sprintf(buf+i+i,"%02x",md_value[i]);

    printf("%s\n",buf);
    free(buf);
    return 0;
}