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Pure Python GOST cryptographic functions library

Project Description

Pure Python 2.7/3.x GOST cryptographic functions library.

GOST is GOvernment STandard of Russian Federation (and Soviet Union).

  • GOST 28147-89 (RFC 5830) block cipher with ECB, CNT (CTR), CFB, MAC, CBC (RFC 4357) modes of operation
  • various 28147-89-related S-boxes included
  • GOST R 34.11-94 hash function (RFC 5831)
  • GOST R 34.11-94 based PBKDF2 function
  • GOST R 34.11-2012 Стрибог (Streebog) hash function (RFC 6986)
  • GOST R 34.10-2001 (RFC 5832) public key signature function
  • GOST R 34.10-2012 (RFC 7091) public key signature function
  • various 34.10 curve parameters included
  • VKO GOST R 34.10-2001 key agreement function (RFC 4357)
  • VKO GOST R 34.10-2012 key agreement function (RFC 7836)
  • 28147-89 and CryptoPro key wrapping (RFC 4357)
  • 28147-89 CryptoPro key meshing for CFB mode (RFC 4357)
  • RFC 4491 (using GOST algorithms with X.509) compatibility helpers
  • 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)
  • PEP247-compatible hash/MAC functions

Known problems: low performance and non time-constant calculations.

Example 34.10-2012 keypair generation, signing and verifying:

>>> from pygost.gost3410 import CURVE_PARAMS
>>> from pygost.gost3410 import GOST3410Curve
>>> curve = GOST3410Curve(*CURVE_PARAMS["GostR3410_2012_TC26_ParamSetA"])
>>> from os import urandom
>>> prv_raw = urandom(32)
>>> 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
>>> from pygost.utils import hexenc
>>> print "Public key is:", hexenc(pub_marshal(pub))
>>> from pygost import gost34112012256
>>> data_for_signing = b"some data"
>>> dgst =
>>> from pygost.gost3410 import sign
>>> signature = sign(curve, prv, dgst, mode=2012)
>>> from pygost.gost3410 import verify
>>> verify(curve, pub, dgst, signature, mode=2012)

Other examples can be found in docstrings and unittests.

PyGOST is free software: see the file COPYING.LESSER for copying conditions.

PyGOST’es home page is: Also available as I2P service: http://ynvvto3unx63wbqmwg7mpdgy3ebven7ihhse6bh5yudwllugd6oa.b32.i2p/ You can read about GOST algorithms more:

Please send questions, bug reports and patches to mailing list. Announcements also go to this mailing list.

Development Git source code repository currently is located here:

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