Function f8_start 

pub unsafe extern "C" fn f8_start(
    cipher: c_int,
    IV: *const c_uchar,
    key: *const c_uchar,
    keylen: c_int,
    salt_key: *const c_uchar,
    skeylen: c_int,
    num_rounds: c_int,
    f8: *mut symmetric_F8,
) -> c_int