Гост хэш функция python

pygost 66.0.2

A package to prevent Dependency Confusion attacks against Yandex.

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This is a security placeholder package. If you want to claim this name for legitimate purposes, please contact us at security@yandex-team.ru or pypi-security@yandex-team.ru

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Introduction¶

The package goscrypto implements various cryptographic functions defined in the State standards of the Russian Federation. All cryptographic functionalities are organized in modules; each modules is dedicated to solving a specific class of problems.

Package	Description
gostcrypto.gosthash	The module implements functions for calculating hash amounts in accordance with GOST R 34.11-2012.
gostcrypto.gostcipher	The module implements block encryption functions in accordance with GOST R 34.12-2015 and their use modes in accordance with GOST R 34.13-2015.
gostcrypto.gostsignature	The module implements the functions of forming and verifying an electronic digital signature in accordance with GOST R 34.10-2012.
gostcrypto.gostrandom	The module implements functions for generating pseudo-random sequences in accordance with R 1323565.1.006-2017.
gostcrypto.gosthmac	The module implements the functions of calculating the HMAC message authentication code in accordance with R 50.1.113-2016.
gostcrypto.gostpbkdf	The module implements the password-based key derivation function in accordance with R 50.1.111-2016.
gostcrypto.gostoid	The module implements generating identifiers for cryptographic objects.

Features¶

Installation¶

Usage gosthash module¶

Getting a hash for a string¶

import gostcrypto hash_string = u'Се ветри, Стрибожи внуци, веютъ с моря стрелами на храбрыя плъкы Игоревы'.encode('cp1251') hash_obj = gostcrypto.gosthash.new('streebog256', data=hash_string) hash_result = hash_obj.hexdigest() 

Getting a hash for a file¶

In this case the buffer_size value must be a multiple of the block_size value.

import gostcrypto file_path = 'hash_file.txt' buffer_size = 128 hash_obj = gostcrypto.gosthash.new('streebog512') with open(file_path, 'rb') as file: buffer = file.read(buffer_size) while len(buffer) > 0: hash_obj.update(buffer) buffer = file.read(buffer_size) hash_result = hash_obj.hexdigest() 

Getting the name identifier of the hashing algorithm object¶

import gostcrypto hash_obj = gostcrypto.gosthash.new('streebog512') oid_name = hash_obj.oid.name 

Usage gostcipher module¶

String encryption in ECB mode¶

import gostcrypto key = bytearray([ 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10, 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, ]) plain_text = bytearray([ 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x00, 0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99, 0x88, 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xee, 0xff, 0x0a, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xee, 0xff, 0x0a, 0x00, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xee, 0xff, 0x0a, 0x00, 0x11, ]) cipher_obj = gostcrypto.gostcipher.new('kuznechik', key, gostcrypto.gostcipher.MODE_ECB, pad_mode=gostcrypto.gostcipher.PAD_MODE_1) cipher_text = cipher_obj.encrypt(plain_text) 

File encryption in CTR mode¶

In this case the buffer_size value must be a multiple of the block_size value.

import gostcrypto key = bytearray([ 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10, 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, ]) init_vect = bytearray([ 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xce, 0xf0, ]) plain_file_path = 'plain_file.txt' cipher_file_path = 'cipher_file.txt' cipher_obj = gostcrypto.gostcipher.new('kuznechik', key, gostcrypto.gostcipher.MODE_CTR, init_vect=init_vect) buffer_size = 128 plain_file = open(plain_file_path, 'rb') cipher_file = open(cipher_file_path, 'wb') buffer = plain_file.read(buffer_size) while len(buffer) > 0: cipher_data = cipher_obj.encrypt(buffer) cipher_file.write(cipher_data) buffer = plain_file.read(buffer_size)) 

Calculating MAC of the file¶

In this case the buffer_size value must be a multiple of the block_size value.

import gostcrypto key = bytearray([ 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10, 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, ]) plain_file_path = 'plain_file.txt' cipher_obj = gostcrypto.gostcipher.new('kuznechik', key, gostcrypto.gostcipher.MODE_MAC) buffer_size = 128 plain_file = open(plain_file_path, 'rb') buffer = plain_file.read(buffer_size) while len(buffer) > 0: cipher_obj.update(buffer) buffer = plain_file.read(buffer_size) mac_result = cipher_obj.digest(8) 

Usage gostsignature module¶

Signing¶

import gostcrypto private_key = bytearray([ 0x7a, 0x92, 0x9a, 0xde, 0x78, 0x9b, 0xb9, 0xbe, 0x10, 0xed, 0x35, 0x9d, 0xd3, 0x9a, 0x72, 0xc1, 0x1b, 0x60, 0x96, 0x1f, 0x49, 0x39, 0x7e, 0xee, 0x1d, 0x19, 0xce, 0x98, 0x91, 0xec, 0x3b, 0x28, ]) digest = bytearray([ 0x2d, 0xfb, 0xc1, 0xb3, 0x72, 0xd8, 0x9a, 0x11, 0x88, 0xc0, 0x9c, 0x52, 0xe0, 0xee, 0xc6, 0x1f, 0xce, 0x52, 0x03, 0x2a, 0xb1, 0x02, 0x2e, 0x8e, 0x67, 0xec, 0xe6, 0x67, 0x2b, 0x04, 0x3e, 0xe5, ]) sign_obj = gostcrypto.gostsignature.new(gostcrypto.gostsignature.MODE_256, gostcrypto.gostsignature.CURVES_R_1323565_1_024_2019['id-tc26-gost-3410-2012-256-paramSetB']) signature = sign_obj.sign(private_key, digest) 

Verify¶

public_key = bytearray([ 0xfd, 0x21, 0xc2, 0x1a, 0xb0, 0xdc, 0x84, 0xc1, 0x54, 0xf3, 0xd2, 0x18, 0xe9, 0x04, 0x0b, 0xee, 0x64, 0xff, 0xf4, 0x8b, 0xdf, 0xf8, 0x14, 0xb2, 0x32, 0x29, 0x5b, 0x09, 0xd0, 0xdf, 0x72, 0xe4, 0x50, 0x26, 0xde, 0xc9, 0xac, 0x4f, 0x07, 0x06, 0x1a, 0x2a, 0x01, 0xd7, 0xa2, 0x30, 0x7e, 0x06, 0x59, 0x23, 0x9a, 0x82, 0xa9, 0x58, 0x62, 0xdf, 0x86, 0x04, 0x1d, 0x14, 0x58, 0xe4, 0x50, 0x49, ]) digest = bytearray([ 0x2d, 0xfb, 0xc1, 0xb3, 0x72, 0xd8, 0x9a, 0x11, 0x88, 0xc0, 0x9c, 0x52, 0xe0, 0xee, 0xc6, 0x1f, 0xce, 0x52, 0x03, 0x2a, 0xb1, 0x02, 0x2e, 0x8e, 0x67, 0xec, 0xe6, 0x67, 0x2b, 0x04, 0x3e, 0xe5, ]) signature = bytearray([ 0x4b, 0x6d, 0xd6, 0x4f, 0xa3, 0x38, 0x20, 0xe9, 0x0b, 0x14, 0xf8, 0xf4, 0xe4, 0x9e, 0xe9, 0x2e, 0xb2, 0x66, 0x0f, 0x9e, 0xeb, 0x4e, 0x1b, 0x31, 0x35, 0x17, 0xb6, 0xba, 0x17, 0x39, 0x79, 0x65, 0x6d, 0xf1, 0x3c, 0xd4, 0xbc, 0xea, 0xf6, 0x06, 0xed, 0x32, 0xd4, 0x10, 0xf4, 0x8f, 0x2a, 0x5c, 0x25, 0x96, 0xc1, 0x46, 0xe8, 0xc2, 0xfa, 0x44, 0x55, 0xd0, 0x8c, 0xf6, 0x8f, 0xc2, 0xb2, 0xa7, ]) sign_obj = gostcrypto.gostsignature.new(gostcrypto.gostsignature.MODE_256, gostcrypto.gostsignature.CURVES_R_1323565_1_024_2019['id-tc26-gost-3410-2012-256-paramSetB']) if sign_obj.verify(public_key, digest, signature): print('Signature is correct') else: print('Signature is not correct') 

Generating a public key¶

private_key = bytearray([ 0x7a, 0x92, 0x9a, 0xde, 0x78, 0x9b, 0xb9, 0xbe, 0x10, 0xed, 0x35, 0x9d, 0xd3, 0x9a, 0x72, 0xc1, 0x1b, 0x60, 0x96, 0x1f, 0x49, 0x39, 0x7e, 0xee, 0x1d, 0x19, 0xce, 0x98, 0x91, 0xec, 0x3b, 0x28, ]) sign_obj = gostcrypto.gostsignature.new(gostcrypto.gostsignature.MODE_256, gostcrypto.gostsignature.CURVES_R_1323565_1_024_2019['id-tc26-gost-3410-2012-256-paramSetB']) public_key = sign_obj.public_key_generate(private_key) 

Getting the identifier of the signature mode object name¶

import gostcrypto sign_obj = gostcrypto.gostsignature.new(gostcrypto.gostsignature.MODE_256, gostcrypto.gostsignature.CURVES_R_1323565_1_024_2019['id-tc26-gost-3410-2012-256-paramSetB']) oid_name = sign_obj.oid.name 

Usage gostrandom module¶

import gostcrypto rand_k = bytearray([ 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10, 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, ]) random_obj = gostcrypto.gostrandom.new(32, rand_k=rand_k, size_s=gostcrypto.gostrandom.SIZE_S_256) random_result = random_obj.random() random_obj.clear() 

Usage gosthmac module¶

Getting a HMAC for a string¶

import gostcrypto key = bytearray.fromhex('000102030405060708090a0b0c0d0e0f1011121315161718191a1b1c1d1e1f') data = bytearray.fromhex('0126bdb87800af214341456563780100') hmac_obj = gostcrypto.gosthmac.new('HMAC_GOSTR3411_2012_256', key, data=data) hmac_result = hmac_obj.digest() 

Getting a HMAC for a file¶

In this case the buffer_size value must be a multiple of the block_size value.

import gostcrypto key = bytearray.fromhex('000102030405060708090a0b0c0d0e0f1011121315161718191a1b1c1d1e1f') file_path = 'hmac_file.txt' buffer_size = 128 hmac_obj = gostcrypto.gosthmac.new('HMAC_GOSTR3411_2012_256', key) with open(file_path, 'rb') as file: buffer = file.read(buffer_size) while len(buffer) > 0: hmac_obj.update(buffer) buffer = file.read(buffer_size) hmac_result = hmac_obj.hexdigest() 

Getting the name identifier of the HMAC algorithm object¶

import gostcrypto key = bytearray.fromhex('000102030405060708090a0b0c0d0e0f1011121315161718191a1b1c1d1e1f') hmac_obj = gostcrypto.gosthmac.new('HMAC_GOSTR3411_2012_256', key) oid_name = hmac_obj.oid.name 

Usage gostpbkdf module¶

import gostcrypto password = b'password' salt = b'salt' pbkdf_obj = gostcrypto.gostpbkdf.new(password, salt=salt, counter=4096) pbkdf_result = pbkdf_obj.derive(32) 

License¶

MIT Copyright (c) 2020 Evgeny Drobotun

Source code¶

Release History¶

• Fixed a MAC calculation bug when using padding in the gostcipher module (in earlier versions (including 1.2.1), the MAC with padding was calculated incorrectly (the bug was in the ‘msb’ and ‘update’ functions))

• Refactoring and code modification in module gostcipher to increase the performance of encryption algorithm ‘kuznechik’ (uses precomputation values of the ‘gf’ function; the performance of the encryption function has increased by an average of 5..10 times)
• Refactoring and code modification in module gosthash to increase the performance of hasing (uses precomputation values of the ‘l, s and p-transformation’, function; the performance of the encryption function has increased by an average of 2..7 times)
• Added the gostoid module that implements generating cryptographic object IDs for the gostcipher, gosthash, gosthmac and gostsignature modules

• Refactoring gostcipher module (changed the class hierarchy to remove code duplication)
• Refactoring gosthash module (remove code duplication)
• Fixed some minor bugs
• Updated docstring in accordance with the Google Python Style Guide

• Use **kvargs in the new function with default parameters (gostrandom, gosthash, gosthmac, gostpbkdf)
• Add the ability to pass data to the new function from gosthmac
• Fixed some minor bugs in the gostrandom module

• Refactoring code gostcipher module (changed the class structure)
• Each module has its own exception class added
• In the new function of the gostcipher module for MAC mode, it is now possible to pass data for MAC calculation, followed by calling the digest method without first calling the update method
• In the new function of the gosthash module, it is now possible to pass data for hash calculation, followed by calling the digest method without first calling the update method
• Added new exceptions for various conflict situations
• Fixed some minor bugs

© Copyright 2020, Evgeny Drobotun Revision 15903116 .

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