pub unsafe extern "C" fn DES_ede3_cfb64_encrypt(
    in_: *const u8,
    out: *mut u8,
    length: c_long,
    ks1: *mut DES_key_schedule,
    ks2: *mut DES_key_schedule,
    ks3: *mut DES_key_schedule,
    ivec: *mut DES_cblock,
    num: *mut c_int,
    enc: c_int
)