pub unsafe fn nettle_ocb_decrypt(
    _ctx: *mut ocb_ctx,
    _key: *const ocb_key,
    _encrypt_ctx: *const c_void,
    _encrypt: nettle_cipher_func,
    _decrypt_ctx: *const c_void,
    _decrypt: nettle_cipher_func,
    _length: usize,
    _dst: *mut u8,
    _src: *const u8
)