Simple hashing & checking example doesn't work

[paulwal]

What am I doing wrong?

Example output:

$s1$0e0810$gDkDQGQo0pFlOyhbMbsFOA==$iyKYbepoMPb63RE0ED3iG05MccJCGBSy0sMFN/SvbybRwuDxyxmdPBBAe2pR6QC3HOVc9KGxJ99w9mNg9NdMAw=
retval:0

---

#include <stdio.h>
#include <stdlib.h>
#include <libscrypt.h>


int main (void)
{
    char mcf[SCRYPT_MCF_LEN];

    libscrypt_hash(mcf, "test", SCRYPT_N, SCRYPT_r, SCRYPT_p);
    printf("%s\n", mcf);

    int a = libscrypt_check(mcf, "test");
    printf("retval:%d\n", a);

    return 0;
}

[jvarho]

Your mcf is missing a final '=', most likely because you have an old version of libscrypt that had a bug in the return value.

[paulwal]

Wow, yeah that's it. I also had to change the string size to [SCRYPT_MCF_LEN+1]

This is the package libscrypt-dev 1-2.2 on Debian 8.11.

[jvarho]

Yeah, that's quite old. The versions 1.21-something in debian 9 and ubuntu 16.04 and newer run your example as is.

[paulwal]

Thanks