What is "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. The function is also described in RFC 6986.