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Efficiency of Spartan-7 FPGA devices in implementation of contemporary cryptographic algorithms

Sugier J.

Journal of Polish Safety and Reliability Association

2018

Vol. 9, No. 3

75--84

Hardware implementations of cryptographic algorithms are ubiquitous in contemporary computer systems where they are used to ensure appropriate level of security e.g. in high-speed data transmission, authentication and access control, distributed cloud storage, etc.. In this paper we evaluate size and speed efficiency of FPGA implementations of selected popular cryptographic algorithms in the newest cost-sensitive Spartan-7 devices form Xilinx, Inc.. The investigated set of algorithms included four examples: the AES-128 standard symmetric block cipher, the BLAKE-256 hash function and two size variants of the KECCAK-f[b] compression function, b = 400 and 1600, with the larger variant being used as the core of the new SHA-3 standard. The main aim of this research was to provide a uniform and comparable implementation approach for all the ciphers so that the new potentials of the Spartan-7 internal architecture would be put to the test in realization of their specific cryptographic transformations and data distribution. Each of the four algorithms was implemented in five architectures: the basic iterative one (with one instance of the cipher round instantiated in hardware) plus two loop unrolled ones (with two and four or five rounds in hardware) and their two pipelined variants (with registers at the outputs of each round enabling parallel processing of multiple streams of data). Uniform implementation methodology applied to 20 cases of cipher & architecture combinations created a consistent testbed, producing comparable results which allowed to evaluate efficiency of the new hardware platform in implementation of the different algorithms in various unrolled and pipelined organizations.