Function mbedtls_sys::mbedtls_ecp_tls_write_group

pub unsafe extern "C" fn mbedtls_ecp_tls_write_group(
    grp: *const mbedtls_ecp_group, 
    olen: *mut size_t, 
    buf: *mut c_uchar, 
    blen: size_t
) -> c_int