Fix negative serials on generated certs

use libc::{c_int, c_long, c_uint};

use std::mem;

use std::num::SignedInt;

use std::ptr;

use asn1::{Asn1Time};

            res = res << 8;

            res |= (*b as c_long) & 0xff;

        }

        res

        // While OpenSSL is actually OK to have negative serials

        // other libraries (for example, Go crypto) can drop

        // such certificates as invalid

        res.abs()

    }

    /// Generates a private key and a signed certificate and returns them

    X509CrlPathValidationError= X509_V_ERR_CRL_PATH_VALIDATION_ERROR,

    X509ApplicationVerification = X509_V_ERR_APPLICATION_VERIFICATION,

)

#[test]

fn test_negative_serial() {

    // I guess that's enough to get a random negative number

    for _ in range(0u, 1000) {

        assert!(X509Generator::random_serial() > 0, "All serials should be positive");

    }

}