A system for implementing SM4 algorithm at ultra-high speed and its operation method

Abstract

The invention relates to an ultra-high-speed system for realizing the SM4 algorithm, including a control module, a cryptographic expansion / encryption / decryption module, an encryption / decryption module, a decryption / encryption module, a data splitter, a cryptographic expansion / encryption / decryption selector, and a round encryption / result splitter and result selector, the present invention solves the problem of low speed caused by having to wait for 32 round keys to be calculated before encryption in the existing hardware system, and the processing speed can reach Nearly twice that of the existing hardware system; based on the idea of ​​module reuse, the present invention realizes the synchronous encryption / decryption operation of three groups of tasks, solves the problem that the decryption module is idle during frequent encryption tasks in the traditional design, and effectively improves The utilization rate and operation speed of the system are improved, and the processing speed is three times that of single-task operation when the key is not changed in multi-task operation, and the fastest is six times that of the existing hardware system.

Description

technical field [0001] The invention relates to an ultra-high-speed implementation of SM4 algorithm system and its operation method, belonging to the technical field of information encryption. Background technique [0002] In March 2012, the State Encryption Security Administration officially established the SM4 block cipher algorithm as an industry standard. At present, the SM4 standard has been commercially promoted on a certain scale in some fields in my country. In the next ten years, wireless local area network, finance, national defense, e-commerce, video encryption and other fields will need nearly 100 million SM4 algorithm encryption and decryption systems. Therefore, the development of high-performance SM4 algorithm encryption and decryption systems has become a hot spot in the industry. [0003] The SM4 algorithm is a block cipher algorithm with a data length of 128 bits and a key length of 128 bits. The key undergoes 32 nonlinear iterative operations to generate ...

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Problems solved by technology

This patent has the following defects: a decryption operation needs to go through 96 rounds of iterations, which seriously reduces the data processing speed, and is not suitable for some occasions that require high speed

[0007] The above two patents are dedicated to reducing the area and redundancy of the system and combining the key expansion module with the encryption / decryption module. However, since the key expansion and data encryption / decryption cannot be performed simultaneously, an encryption operation must go through 32 Round key expansion and 32 rounds of encryption have a total of 64 rounds of iteration time, which seriously reduces the data processing speed and is not suitable for some occasions that require high speed

[0008] In the traditional design, the key expansion module, the encryption module and the decryption module are separated, and the method of starting the encryption module after waiting for 32 rounds of key calculation is usually adopted, which obviously cannot meet the requirements of high-speed fields such as network transmission and video encryption.

At the same time, since the key of the same user is relatively fixed most of the time, the same round of key can continuously encrypt / decrypt multiple sets of data. At this time, the traditional design still needs additional key expansion, which will not only reduce the processing speed of the operation, but also Bring unnecessary dynamic power consumption; moreover, because a set of data to be processed is often far more than 128 bits, most applications will have continuous encryption or decryption tasks, resulting in the continuous operation of the encryption module but the long-term idle of the decryption module, or the decryption The module runs continuously. The encryption module is idle for a long time, which reduces the utilization rate of the system and seriously affects the calculation speed of the data.

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