tet

        while (b) { size_t t = b; b = a % b; a = t; }

        return a;

    }

    /* LCM for n-fold */

    size_t lcm(size_t a, size_t b) {

        return a / gcd(a, b) * b;

    }

}

/******************************************************************************

std::vector<uint8_t> Asn1Der::encodeGeneralizedTime(time_t t) {

    struct tm utc;

    portable_gmtime_r(&t, &utc);

    char buf[20];

    char buf[32];

    snprintf(buf, sizeof(buf), "%04d%02d%02d%02d%02d%02dZ",

             utc.tm_year + 1900, utc.tm_mon + 1, utc.tm_mday,

             utc.tm_hour, utc.tm_min, utc.tm_sec);