High-efficient encryption and decryption processing method for implementing SMS4 algorithm

摘要

An encrypting/decrypting processing method for implementing SMS4 algorithm in high efficiency is provided. After preparing constant array, input external data into register section, firstly make primary data conversion and then make secondary data conversion, finally repeat data conversion course until complete all specified data conversion courses and obtain processing result of circulating data encryption/decryption. And it solves the technical problems of data conversion in the background technique that number of circulating times is large and encrypting efficiency is low, simplifying the chip design, largely optimizing integrity of chip signal and being able to improve interference immunity of system and reduce system cost.