GOST cryptographic functions
Project description
The package implements various cryptographic functions defined in the State standards of the Russian Federation. It includes the following modules:
gosthash: The module implements functions for calculating hash amounts in accordance with GOST R 34.11-2012.
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.
gostsignature: The module implements the functions of forming and verifying an electronic digital signature in accordance with GOST R 34.10-2012.
gostrandom: The module implements functions for generating pseudo-random sequences in accordance with R 1323565.1.006-2017.
gosthmac: The module implements the functions of calculating the HMAC message authentication code in accordance with R 50.1.113-2016.
gostpbkdf: The module implements the password-based key derivation function in accordance with R 50.1.111-2016.
gostoid: The module implements generating identifiers for cryptographic objects.
Installation
$ pip install gostcrypto
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.fromhex('7a929ade789bb9be10ed359dd39a72c11b60961f49397eee1d19ce9891ec3b28')
digest = bytearray.fromhex('2dfbc1b372d89a1188c09c52e0eec61fce52032ab1022e8e67ece6672b043ee5')
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.fromhex('fd21c21ab0dc84c154f3d218e9040bee64fff48bdff814b232295b09d0df72e45026dec9ac4f07061a2a01d7a2307e0659239a82a95862df86041d1458e45049')
digest = bytearray.fromhex('2dfbc1b372d89a1188c09c52e0eec61fce52032ab1022e8e67ece6672b043ee5')
signature = bytearray.fromhex('4b6dd64fa33820e90b14f8f4e49ee92eb2660f9eeb4e1b313517b6ba173979656df13cd4bceaf606ed32d410f48f2a5c2596c146e8c2fa4455d08cf68fc2b2a7')
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.fromhex('7a929ade789bb9be10ed359dd39a72c11b60961f49397eee1d19ce9891ec3b28')
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')
data = bytearray.fromhex('0126bdb87800af214341456563780100')
hmac_obj = gostcrypto.gosthmac.new('HMAC_GOSTR3411_2012_256', key, data=data)
hmac_result = hmac_obj.digest()
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
Documentation
Documentation for using this package: https://gostcrypto.readthedocs.io/
Release History
1.2.5 (05.09.2021)
Fixed a several minor bugs
1.2.4 (17.09.2020)
Fixed a default initial vector bug (added default initial vector for ‘magma’ algorithm)
1.2.3 (23.05.2020)
Added Python version checking (use version 3.6 or higher)
1.2.2 (15.05.2020)
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))
1.2.1 (13.05.2020)
Fixed a MAC calculation bug when using padding in the gostcipher module
1.2.0 (07.05.2020)
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
1.1.2 (02.05.2020)
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
1.1.1 (20.04.2020)
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
1.1.0 (15.04.2020)
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
1.0.0 (08.04.2020)
First release of ‘gostcrypto’
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