skjolber / desfire-tools-for-android Goto Github PK

public static int
create_file2 (MifareTag tag, byte command, byte file_no, boolean has_iso_file_id, short iso_file_id, byte communication_settings, short access_rights, int record_size, int max_number_of_records) throws Exception
{
	// todo the original create_file2 method seems to use wrong lengths
	ASSERT_ACTIVE (tag);
	ASSERT_MIFARE_DESFIRE (tag);

	ByteBuffer cmd = C.BUFFER_INIT (11 + CMAC_LENGTH);

	C.BUFFER_APPEND (cmd, command);
	C.BUFFER_APPEND (cmd, file_no);
	if (has_iso_file_id)

		C.BUFFER_APPEND_LE (cmd, C.getBytes2(iso_file_id), 2, 2);
	C.BUFFER_APPEND (cmd, communication_settings);
	C.BUFFER_APPEND_LE (cmd, C.getBytes2(access_rights), 2, 2);
	C.BUFFER_APPEND_LE (cmd, C.getBytes4(record_size), 3, 4); // this might be wrong, field size is 3 ?
	C.BUFFER_APPEND_LE (cmd, C.getBytes4(max_number_of_records), 3, 4); // this might be wrong, field size is 3 ?

	byte[] p = MifareDesfireCrypto.mifare_cryto_preprocess_data (tag, cmd, cmd.position(), 0, MifareDesfireCrypto.MDCM_PLAIN | MifareDesfireCrypto.CMAC_COMMAND);

	byte[] res = DESFIRE_TRANSCEIVE2(tag, p);

	byte[] buffer = new byte[1 + CMAC_LENGTH];
	System.arraycopy(res, 0, buffer, 0, res.length);

	p = MifareDesfireCrypto.mifare_cryto_postprocess_data (tag, buffer, res.length, MifareDesfireCrypto.MDCM_PLAIN | MifareDesfireCrypto.CMAC_COMMAND | MifareDesfireCrypto.CMAC_VERIFY);

	if (p == null) {
		return -1;
	}

	cached_file_settings[file_no] = null;

	return 0;
}

    C.BUFFER_APPEND_LE (cmd, C.getBytes3(record_size), 3, 3); // changed to field size is 3
    C.BUFFER_APPEND_LE (cmd, C.getBytes3(max_number_of_records), 3, 3); // changed to field size is 3