Reconfigurable S-box circuit structure applied to SM4 and Camellia cryptographic algorithms

Abstract

The invention provides a reconfigurable S-box circuit structure applied to SM4 and Camellia cryptographic algorithms. The structure comprises a first composite matrix multiplication unit, a second composite matrix multiplication unit, a first constant addition unit, a second constant addition unit, a third constant addition unit, a fourth constant addition unit, a composite domain multiplication inverse unit, a first selector, a second selector, a byte data input port, a byte data output port and a control signal input port. The first selector and the second selector are alternative selectors. According to the structure, in a mode of multiplexing the composite domain multiplication inverse unit, reconfigurable functions of an SM4 S-box operation and a Camellia S-box operation are realized; through multiplexing of the composite domain multiplication inverse unit, a circuit area is greatly reduced, moreover, a composite matrix structure is beneficial for improving the circuit optimization efficiency, and the circuit area is further reduced.

Description

technical field [0001] The invention relates to the technical field of cryptographic circuits, in particular to a reconfigurable S-box circuit structure applied to SM4 and Camellia cryptographic algorithms. Background technique [0002] 1. SM4 cryptographic algorithm and Camellia cryptographic algorithm [0003] The SM4 cipher algorithm is the first commercial block cipher algorithm announced by my country's National Commercial Encryption Management Office in January 2006, and its block length and key length are both 128 bits. The Camellia algorithm was jointly designed by NTT and Mitsubishi in 2000. The data packet length of the Camellia algorithm is also 128 bits, and the key length is 128 bits, 192 bits and 256 bits. Camellia has been selected as a standard algorithm by many organizations, including the NESSIE standard in Europe, the CRYPTREC standard in Japan, and the ISO / IEC18033-3 standard formulated by the International Organization for Standardization and the Intern...

AI Technical Summary

Problems solved by technology

[0039] Because in the prior art, when the SM4 cryptographic algorithm and the Camellia cryptographic algorithm are shared in an electronic device, the S-box operation in the SM4 cryptographic algorithm and the S-box operation in the Camellia cryptographic algorithm are respectively implemented through two different circuits, resulting in an overall The circuit area of ​​the cryptographic algorithm is large, so that the device using the encryption method is large, which does not meet people's requirements for light, thin, short and small electronic devices.

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