Message expansion circuit of secure hash algorithm

Abstract

The invention discloses a message expansion circuit of a secure hash algorithm. The message expansion circuit comprises 64 stages of pipeline circuits, and each stage of pipeline circuit comprises 16groups of latches and a combinational logic circuit; the combinational logic circuit comprises four selectors, two shift XOR circuits and an adder. Each stage of pipeline circuit comprises a main clock; 16 groups of frequency division clocks with the phase difference of 1 in sequence are also generated, the 16 groups of frequency division clocks are respectively used as trigger clocks of 16 groupsof latches, and the clock frequency of the frequency division clocks is 1 / 16 of that of the main clock, i.e., the frequency division clocks respectively trigger the corresponding latches at the moments of 0-15 of the main clock; and the clock phase difference of the same group of latches in two adjacent stages of pipeline circuits is kept at 15. According to the message expansion circuit of the secure hash algorithm, the clock and flip rate of a sequential logic circuit are reduced to 1 / 16 of those of a traditional implementation, and the power consumption of the SHA256 message expansion circuit can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of digital integrated circuits, and in particular relates to a message expansion circuit of a secure hash algorithm. Background technique [0002] Secure Hash Algorithm (Secure Hash Algorithm, abbreviated as SHA) is a family of cryptographic hash functions and is a secure hash algorithm certified by FIPS. An algorithm that can calculate a fixed-length string (also known as a message digest) corresponding to a digital message. And if the input messages are different, there is a high probability that they correspond to different strings. With the rapid development of the Internet of Things today, more and more terminals sensitive to power consumption are added to the network, and the application of the SHA algorithm is becoming more and more extensive. The traditional SHA algorithm is implemented by software, and its disadvantage is that the calculation speed is slow and occupies the CPU. , implementing the ...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a message expansion circuit of a secure hash algorithm to solve the problem of large power consumption caused by the operation of the secure hash algorithm

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