OpenSSL.fips_mode=

static VALUE
ossl_fips_mode_set(VALUE self, VALUE enabled)
{
#if OSSL_OPENSSL_PREREQ(3, 0, 0)
    if (RTEST(enabled)) {
        if (!EVP_default_properties_enable_fips(NULL, 1)) {
            ossl_raise(eOSSLError, "Turning on FIPS mode failed");
        }
    } else {
        if (!EVP_default_properties_enable_fips(NULL, 0)) {
            ossl_raise(eOSSLError, "Turning off FIPS mode failed");
        }
    }
    return enabled;
#elif defined(OPENSSL_FIPS)
    if (RTEST(enabled)) {
        int mode = FIPS_mode();
        if(!mode && !FIPS_mode_set(1)) /* turning on twice leads to an error */
            ossl_raise(eOSSLError, "Turning on FIPS mode failed");
    } else {
        if(!FIPS_mode_set(0)) /* turning off twice is OK */
            ossl_raise(eOSSLError, "Turning off FIPS mode failed");
    }
    return enabled;
#else
    if (RTEST(enabled))
        ossl_raise(eOSSLError, "This version of OpenSSL does not support FIPS mode");
    return enabled;
#endif
}