说明：  Siemens加密接触式IC卡Sle4442的C51源代码，包括读写子程序，加解密子程序，有详细的调用方法，已在产品稳定运行，只要编写自己的加密算法就可直接调。
(Siemens encryption contactless IC card Sle4442 the C51 source code, including read and write subroutines, encryption and decryption subroutine, with detailed call method, and stable operation has been in the product, as long as the write your own encryption algorithm can be directly transferred.)