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Streebog
Streebog is a cryptographic hash function defined in the Russian national standard GOST R 34.11-2012 ''Information Technology - Cryptographic Information Security - Hash Function''. It was created to replace an obsolete GOST hash function defined in the old standard GOST R 34.11-94, and as an asymmetric reply to SHA-3 competition by the US National Institute of Standards and Technology.〔https://www.streebog.net/ GOST R 34.11-2012: Streebog Hash Function〕 The function is also described in RFC 6986.
==Description==
Streebog is a family of two hash functions, Streebog-256 and Streebog-512, that produce output 256-bit or 512-bit hash respectively from a bit string of arbitrary size using the Merkle-Damgård construction.〔https://mjos.fi/doc/saarinen_stribob.pdf StriBob: Authenticated Encryption from GOST R 34.11-2012 LPS Permutation〕 The high-level structure of the new hash function resembles the one from GOST R 34.11-94, however, the compression function was changed significantly.〔http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.380.318 Algebraic Aspects of the Russian Hash Standard GOST R 34.11-2012〕 The compression function operates in Miyaguchi-Preneel mode and employs a 12-round AES-like cipher.
The function was named Streebog after the god of rash wind in ancient Slavic mythology,〔 and is often referred by this name, even though it is not explicitly mentioned in the text of the standard.〔http://protect.gost.ru/document.aspx?control=7&baseC=6&page=1&month=6&year=-1&search=&id=180209 Full text of GOST R 34.11-2012 standard (Russian)〕
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