Function rsa_set_key 

pub unsafe extern "C" fn rsa_set_key(
    N: *const c_uchar,
    Nlen: c_ulong,
    e: *const c_uchar,
    elen: c_ulong,
    d: *const c_uchar,
    dlen: c_ulong,
    key: *mut rsa_key,
) -> c_int