面向密码流体系结构的超长指令字可重构研究

摘要

Reconfigurable cipher stream architecture is a newly proposed architecture for cipher processing, but poor Very Large Instruction Word (VLIW) code density and huge Kernel level code cubage are always serious problems on this architecture. Through analyzing the characteristics of a series of cryptographic algorithms on Stream based Reconfiguable Clustered block Cipher Processing Array (S-RCCPA) architecture, a reconfigurable VLIW dynamically technology is proposed, and the corresponding Kernel level instruction set and hardware circuit structure are designed. The experiments demonstrate that this technology can reduce VLIW width, thus improve the instruction density of VLIW effectively. Meanwhile, it can reduce about 33% of the Kernel volume, and depress the microcode store capacity from 96 kB to 64 kB. Thus it can also reduce the whole area and power consumption of chip respectively.%可重构密码流体系结构是一种面向密码运算的新型体系结构，但存在着超长指令字(VLIW)代码稀疏和Kernel体积过大的问题。该文以可重构密码流处理架构S-RCCPA为研究平台，通过大量密码算法在S-RCCPA架构上的适配分析，提出了VLIW可重构技术，并设计了Kernel级指令集、VLIW可重构算法及指令可重构单元。实验证明，该技术能够有效提高VLIW的指令密度，同时降低了VLIW的指令宽度，使得整个Kernel体积减小了约33.3%，并将微码存储器的容量由96 kB降为64 kB，有效降低芯片整体面积和系统功耗。