pub unsafe extern "C" fn crypt_reencrypt_init_by_keyring( cd: *mut crypt_device, name: *const c_char, key_description: *const c_char, keyslot_old: c_int, keyslot_new: c_int, cipher: *const c_char, cipher_mode: *const c_char, params: *const crypt_params_reencrypt) -> c_int