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 34.11-2012 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 34.10-2001 Diffie-Hellman function (RFC 4357)
* 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 34.13-2015 padding methods
* PEP247-compatible hash/MAC functions

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

Example X.509 compatible 34.10-2012 keypair generation, signing and
verifying its signature:

    >>> from pygost import x509
    >>> prv, pub = x509.keypair_gen(urandom(64), mode=2012)
    >>> data = b'some data'
    >>> signature = x509.sign(prv, data, mode=2012)
    >>> x509.verify(pub, data, signature, mode=2012)
    True

Other examples can be found in docstrings.

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

PyGOST'es home page is: http://www.cypherpunks.ru/pygost/

Please send questions, bug reports and patches to
https://lists.cypherpunks.ru/mailman/listinfo/gost
mailing list. Announcements also go to this mailing list.

Development Git source code repository currently is located here:
http://git.cypherpunks.ru/cgit.cgi/pygost.git/