System for realizing SM4 algorithm at super-speed as well as operating method of system

Abstract

The invention relates to a system for realizing SM4 algorithm at a super-speed. The system comprises a control module, a cipher-expanding / ciphering / deciphering module, a ciphering / deciphering module, a ciphering / deciphering module, a data channel subdivider, a cipher-expanding / ciphering and deciphering selector, a round cipher / result channel subdivider and a result selector. The system provided by the invention solves the problem that the speed is low in the existing hardware system as 32 round keys are computed to cipher, and during single task operation, the treatment speed can reach nearly two folds of the existing hardware system. Based on the thought of module reusability, three tasks are synchronously ciphered and deciphered, and the problem that a deciphering module is idle during frequent ciphering tasks in conventional design is solved, so that the utilization ratio and operating speed of the system are effectively improved; during multi-task operation without changing the keys, the processing speed reaches three times that of the single-task operation, the fastest 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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