Circuit and method for dynamically generating symmetric cipher with round key

Abstract

The invention belongs to the technical field of digital circuits, and provides a circuit and a method of using round keys to dynamically generate a symmetric cipher. The circuit comprises a round key iterative register file, a data iterative register file, a first round operation unit and a second round operation unit, wherein an output end of the round key iterative register file is connected with an input end of the first round operation unit; an output end of the first round operation unit is connected with the input end of the round key iterative register file; an output end of the data iterative register file and the output end of the round key iterative register file are connected with an input end of the second round operation unit; an output end of the second round operation unit is connected with an input end of the data iterative register file; the first round operation unit and the second round operation unit are respectively used for updating the round key and the data of the data iterative register file at each clock rising edge. According to the circuit and the method disclosed by the invention, the encryption process can be begun when not all the round keys are generated, so that the RAM can be saved, and the data throughput rate can be increased.

Description

technical field [0001] The invention belongs to the technical field of digital circuits, and in particular relates to a circuit and a method for dynamically generating a symmetric cipher by a round key. Background technique [0002] SMS4 is a block symmetric cipher algorithm for wireless LAN products announced by China National Commercial Cryptography Administration in January 2006. [0003] The Advanced Encryption Standard (AES) is a new security encryption standard released in the early 21st century. Since AES is a replacement for DES, it has been adopted as the de facto cryptographic standard by banking, administration and industry since its adoption as a standard. [0004] Most of the traditional AES algorithm and SMS4 algorithm circuit implementation adopt the round key pre-calculation method, that is, first calculate all the round keys required for each round of operation, store them in RAM, and then take them out one by one when performing round operations. In this ...

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Problems solved by technology

[0005] The embodiment of the present invention provides a circuit and method for dynamically generating a symmetric cipher with a round key, which aims to solve the problem that the round key occupies the RAM area in the prior art, and the encryption process needs to wait for all the round keys to be generated before starting , the problem of low data throughput

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