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Kuznyechik - Russian 128-bit Block Cipher ========================================= There are many implementations of Kuznyechik cipher on the Internet. We have tested most of these and compared their performance as well as some other important attributes (SIMD optimization, readability, etc.). With this knowledge having gained, we decided to implement a new implementation combining two major attributes: maximal speed and good readability. This version is mostly based on Dr. Markku-Juhani O. Saarinen's code that is available at: https://github.com/mjosaarinen/kuznechik However, his implementation did not contain an optimized native 64-bit version without SIMD optimizations. Since we wanted to have a portable implementation that could be run even on CPUs without SSE instructions, we needed to add it. The native 64-bit version has been inspired by code used in VeraCrypt, and originally written by "kerukuro": https://github.com/veracrypt/veracrypt Optimization ------------ This code contains two distinct implementations at once. You can determine what version will be used by defining `HAVE_SSE2` macro. Both versions, however, are optimized by using large precomputed lookup tables. - If the macro is not defined, a portable version working with 64-bit integers will be used. - In the case that your CPU supports SSE2 instructions, you can enable SSE2 optimization by defining the `HAVE_SSE2` macro. It increases performance dramatically. Notes ----- 2018-11-15 - tested on virtual big-endian machine (powerpc in qemu).
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