商密SM4算法实现，输入16进制要加密数据，获得加密结果-Business secret SM4 algorithm, enter 16 hex to encrypt data encryption result obtained

实现SM4算法，迭代加密与解密，并且对加密10000000次和解密10000000次进行了时间测试-The realization of SM4 algorithm, iterative encryption and decryption, the encryption and decryption and 10000000 times 10000000 times for the test of time