Function mbedtls_sys::mbedtls_ecp_gen_key

pub unsafe extern "C" fn mbedtls_ecp_gen_key(
    grp_id: mbedtls_ecp_group_id, 
    key: *mut mbedtls_ecp_keypair, 
    f_rng: Option<unsafe extern "C" fn(_: *mut c_void, _: *mut c_uchar, _: size_t) -> c_int>, 
    p_rng: *mut c_void
) -> c_int