Abstract
The Advanced Encryption Standard (AES) was standardized in 2001 by NIST and has become the de facto block cipher used today. AES is a block cipher with a block size of 128 bits and is based on the proposal by Rijmen and Daemen, named “R i j n d a e l”. The R i j n d a e l proposal includes a definition for a block cipher with 256 bits block size (and a 256-bits key), which we call here R i j n d a e l256. This variant has not been standardized. This paper describes software optimization methods for fast computations of R i j n d a e l256 on modern x86-64 platforms equipped with AES-NI and with vector AES-NI instructions. We explore several implementation methods and report a speed record for R i j n d a e l256 at 0.27 cycles per byte.
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Acknowledgements
This research was partly supported by: NSF-BSF Grant 2018640; The Israel Science Foundation (grant No. 3380/19); The Center for Cyber Law and Policy at the University of Haifa, in conjunction with the Israel National Cyber Bureau in the Prime Minister’s Office.
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Drucker, N., Gueron, S. (2022). Software Optimization of Rijndael for Modern x86-64 Platforms. In: Latifi, S. (eds) ITNG 2022 19th International Conference on Information Technology-New Generations. Advances in Intelligent Systems and Computing, vol 1421. Springer, Cham. https://doi.org/10.1007/978-3-030-97652-1_18
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DOI: https://doi.org/10.1007/978-3-030-97652-1_18
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