PyGOST is pure Python 3.x GOST cryptographic functions library.
GOST is GOvernment STandard of Russian Federation (and Soviet Union).
=> It is copylefted
=> free software
licenced under
=> GPLv3
You can read more
=> about GOST algorithms.

Currently supported algorithms are:

* GOST 28147-89 block cipher with ECB, CNT (CTR), CFB, MAC, CBC modes
  => RFC 5830
  => RFC 4357
* various 28147-89-related S-boxes included
* GOST R 34.11-94 hash function
  => RFC 5831
* GOST R 34.11-94 based
  => PBKDF2
* GOST R 34.11-2012 Стрибог (Streebog) hash function
  => RFC 6986
* GOST R 34.11-2012 based PBKDF2 function (ТК26 Р 50.1.111-2016)
* GOST R 34.10-2001 signature
  => RFC 5832
* GOST R 34.10-2012 signature
  => RFC 7091
* various 34.10 curve parameters included
* Coordinates conversion from twisted Edwards to Weierstrass form
  and vice versa
* VKO GOST R 34.10-2001 VKO key agreement function
  => RFC 4357
* VKO GOST R 34.10-2012 VKO key agreement function
  => RFC 7836
* 28147-89 and CryptoPro key wrapping
  => RFC 4357
* 28147-89 CryptoPro key meshing for CFB and CBC modes
  => RFC 4357
* X.509 compatibility helpers
  => RFC 4491
* GOST R 34.12-2015 128-bit block cipher Кузнечик (Kuznechik)
  => RFC 7801
* GOST R 34.12-2015 64-bit block cipher Магма (Magma)
* GOST R 34.13-2015 padding methods and block cipher modes of operation
      (ECB, CTR, OFB, CBC, CFB, MAC), ISO 10126 padding
* MGM AEAD mode for 64 and 128 bit ciphers
  => RFC 9058
* SESPAKE password-authenticated key exchange protocol (ТК26 Р 50.1.115-2016)
  => RFC 8133
* CTR-ACPKM, OMAC-ACPKM-Master modes of operation (ТК26 Р 1323565.1.017-2018)
* KExp15/KImp15 key export/import functions (ТК26 Р 1323565.1.017-2018)
* KDF_GOSTR3411_2012_256, KDF_TREE_GOSTR3411_2012_256 (ТК26 Р 50.1.113-2016)
* KEG export key generation function (ТК26 Р 1323565.1.020-2018)
* PEP247-compatible hash/MAC functions

Example 34.10-2012 keypair generation, signing and verifying:

    >>> from pygost.gost3410 import CURVES
    >>> curve = CURVES["id-tc26-gost-3410-12-512-paramSetA"]
    >>> from os import urandom
    >>> prv_raw = urandom(64)
    >>> from pygost.gost3410 import prv_unmarshal
    >>> prv = prv_unmarshal(prv_raw)
    >>> from pygost.gost3410 import public_key
    >>> pub = public_key(curve, prv)
    >>> from pygost.gost3410 import pub_marshal
    >>> print "Public key is:", pub_marshal(pub).hex()
    >>> from pygost import gost34112012512
    >>> data_for_signing = b"some data"
    >>> dgst = gost34112012512.new(data_for_signing).digest()[::-1]
    >>> from pygost.gost3410 import sign
    >>> signature = sign(curve, prv, dgst)
    >>> from pygost.gost3410 import verify
    >>> verify(curve, pub, dgst, signature)

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