2 # PyGOST -- Pure Python GOST cryptographic functions library
3 # Copyright (C) 2015-2020 Sergey Matveev <stargrave@stargrave.org>
5 # This program is free software: you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation, version 3 of the License.
9 # This program is distributed in the hope that it will be useful,
10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 # GNU General Public License for more details.
14 # You should have received a copy of the GNU General Public License
15 # along with this program. If not, see <http://www.gnu.org/licenses/>.
17 from base64 import b64decode
18 from unittest import skipIf
19 from unittest import TestCase
21 from pygost.gost28147 import cfb_decrypt
22 from pygost.gost3410 import CURVES
23 from pygost.gost3410 import prv_unmarshal
24 from pygost.gost3410 import pub_unmarshal
25 from pygost.gost3410 import public_key
26 from pygost.gost3410 import verify
27 from pygost.gost3410_vko import kek_34102012256
28 from pygost.gost3410_vko import ukm_unmarshal
29 from pygost.gost34112012256 import GOST34112012256
30 from pygost.gost34112012512 import GOST34112012512
31 from pygost.utils import hexdec
32 from pygost.wrap import unwrap_cryptopro
33 from pygost.wrap import unwrap_gost
36 from pyderasn import DecodePathDefBy
37 from pyderasn import OctetString
39 from pygost.asn1schemas.cms import ContentInfo
40 from pygost.asn1schemas.oids import id_envelopedData
41 from pygost.asn1schemas.oids import id_tc26_gost3410_2012_256
42 from pygost.asn1schemas.oids import id_tc26_gost3410_2012_512
44 pyderasn_exists = False
46 pyderasn_exists = True
49 @skipIf(not pyderasn_exists, "PyDERASN dependency is required")
50 class TestSigned(TestCase):
51 """SignedData test vectors from "Использование
52 алгоритмов ГОСТ 28147-89, ГОСТ Р 34.11 и ГОСТ Р 34.10 в
53 криптографических сообщениях формата CMS" (TK26CMS.pdf)
64 content_info, tail = ContentInfo().decode(content_info_raw)
65 self.assertSequenceEqual(tail, b"")
66 self.assertIsNotNone(content_info["content"].defined)
67 _, signed_data = content_info["content"].defined
68 self.assertEqual(len(signed_data["signerInfos"]), 1)
69 curve = CURVES[curve_name]
70 self.assertTrue(verify(
72 public_key(curve, prv_unmarshal(prv_key_raw)),
73 hasher(bytes(signed_data["encapContentInfo"]["eContent"])).digest()[::-1],
74 bytes(signed_data["signerInfos"][0]["signature"]),
79 content_info_raw = b64decode("""
80 MIIBBQYJKoZIhvcNAQcCoIH3MIH0AgEBMQ4wDAYIKoUDBwEBAgIFADAbBgkqhkiG
81 9w0BBwGgDgQMVGVzdCBtZXNzYWdlMYHBMIG+AgEBMFswVjEpMCcGCSqGSIb3DQEJ
82 ARYaR29zdFIzNDEwLTIwMTJAZXhhbXBsZS5jb20xKTAnBgNVBAMTIEdvc3RSMzQx
83 MC0yMDEyICgyNTYgYml0KSBleGFtcGxlAgEBMAwGCCqFAwcBAQICBQAwDAYIKoUD
84 BwEBAQEFAARAkptb2ekZbC94FaGDQeP70ExvTkXtOY9zgz3cCco/hxPhXUVo3eCx
85 VNwDQ8enFItJZ8DEX4blZ8QtziNCMl5HbA==
87 prv_key_raw = hexdec("BFCF1D623E5CDD3032A7C6EABB4A923C46E43D640FFEAAF2C3ED39A8FA399924")[::-1]
91 "id-GostR3410-2001-CryptoPro-XchA-ParamSet",
97 content_info_raw = b64decode("""
98 MIIBSQYJKoZIhvcNAQcCoIIBOjCCATYCAQExDjAMBggqhQMHAQECAwUAMBsGCSqG
99 SIb3DQEHAaAOBAxUZXN0IG1lc3NhZ2UxggECMIH/AgEBMFswVjEpMCcGCSqGSIb3
100 DQEJARYaR29zdFIzNDEwLTIwMTJAZXhhbXBsZS5jb20xKTAnBgNVBAMTIEdvc3RS
101 MzQxMC0yMDEyICg1MTIgYml0KSBleGFtcGxlAgEBMAwGCCqFAwcBAQIDBQAwDAYI
102 KoUDBwEBAQIFAASBgFyVohNhMHUi/+RAF3Gh/cC7why6v+4jPWVlx1TYlXtV8Hje
103 hI2Y+rP52/LO6EUHG/XcwCBbUxmRWsbUSRRBAexmaafkSdvv2FFwC8kHOcti+UPX
104 PS+KRYxT8vhcsBLWWxDkc1McI7aF09hqtED36mQOfACzeJjEoUjALpmJob1V
106 prv_key_raw = hexdec("3FC01CDCD4EC5F972EB482774C41E66DB7F380528DFE9E67992BA05AEE462435757530E641077CE587B976C8EEB48C48FD33FD175F0C7DE6A44E014E6BCB074B")[::-1]
110 "id-tc26-gost-3410-12-512-paramSetB",
116 @skipIf(not pyderasn_exists, "PyDERASN dependency is required")
117 class TestDigested(TestCase):
118 """DigestedData test vectors from "Использование
119 алгоритмов ГОСТ 28147-89, ГОСТ Р 34.11 и ГОСТ Р 34.10 в
120 криптографических сообщениях формата CMS" (TK26CMS.pdf)
123 def process_cms(self, content_info_raw, hasher):
124 content_info, tail = ContentInfo().decode(content_info_raw)
125 self.assertSequenceEqual(tail, b"")
126 self.assertIsNotNone(content_info["content"].defined)
127 _, digested_data = content_info["content"].defined
128 self.assertSequenceEqual(
129 hasher(bytes(digested_data["encapContentInfo"]["eContent"])).digest(),
130 bytes(digested_data["digest"]),
134 content_info_raw = b64decode("""
135 MIGdBgkqhkiG9w0BBwWggY8wgYwCAQAwDAYIKoUDBwEBAgIFADBXBgkqhkiG9w0B
136 BwGgSgRI0eUg4uXy8OgsINHy8Ojh7uboIOLt8/boLCDi5f7y+iDxIOzu8P8g8fLw
137 5evg7Ogg7eAg9fDg4fD7/yDv6/rq+yDI4+7w5eL7BCCd0v5OkECeXah/U5dtdAWw
138 wMrGKPxmmnQdUAY8VX6PUA==
140 self.process_cms(content_info_raw, GOST34112012256)
143 content_info_raw = b64decode("""
144 MIG0BgkqhkiG9w0BBwWggaYwgaMCAQAwDAYIKoUDBwEBAgMFADBOBgkqhkiG9w0B
145 BwGgQQQ/MDEyMzQ1Njc4OTAxMjM0NTY3ODkwMTIzNDU2Nzg5MDEyMzQ1Njc4OTAx
146 MjM0NTY3ODkwMTIzNDU2Nzg5MDEyBEAbVNAaSvW51cw9htaNKFRisZq8JHUiLzXA
147 hRIr5Lof+gCtMPh2ezqCOExldPAkwxHipIEzKwjvf0F5eJHBZG9I
149 self.process_cms(content_info_raw, GOST34112012512)
152 @skipIf(not pyderasn_exists, "PyDERASN dependency is required")
153 class TestEnvelopedKTRI(TestCase):
154 """EnvelopedData KeyTransRecipientInfo-based test vectors from
155 "Использование алгоритмов ГОСТ 28147-89, ГОСТ Р 34.11 и ГОСТ Р 34.10
156 в криптографических сообщениях формата CMS" (TK26CMS.pdf)
167 sbox = "id-tc26-gost-28147-param-Z"
168 content_info, tail = ContentInfo().decode(content_info_raw, ctx={
173 DecodePathDefBy(id_envelopedData),
178 DecodePathDefBy(spki_algorithm),
179 "transportParameters",
180 "ephemeralPublicKey",
186 ("..", "subjectPublicKey"),
188 id_tc26_gost3410_2012_256: OctetString(),
189 id_tc26_gost3410_2012_512: OctetString(),
193 ) for spki_algorithm in (
194 id_tc26_gost3410_2012_256,
195 id_tc26_gost3410_2012_512,
199 self.assertSequenceEqual(tail, b"")
200 self.assertIsNotNone(content_info["content"].defined)
201 _, enveloped_data = content_info["content"].defined
202 eci = enveloped_data["encryptedContentInfo"]
203 ri = enveloped_data["recipientInfos"][0]
204 self.assertIsNotNone(ri["ktri"]["encryptedKey"].defined)
205 _, encrypted_key = ri["ktri"]["encryptedKey"].defined
206 ukm = bytes(encrypted_key["transportParameters"]["ukm"])
207 spk = encrypted_key["transportParameters"]["ephemeralPublicKey"]["subjectPublicKey"]
208 self.assertIsNotNone(spk.defined)
209 _, pub_key_their = spk.defined
210 curve = CURVES[curve_name]
211 kek = keker(curve, prv_key_our, bytes(pub_key_their), ukm)
212 key_wrapped = bytes(encrypted_key["sessionEncryptedKey"]["encryptedKey"])
213 mac = bytes(encrypted_key["sessionEncryptedKey"]["macKey"])
214 cek = unwrap_cryptopro(kek, ukm + key_wrapped + mac, sbox=sbox)
215 ciphertext = bytes(eci["encryptedContent"])
216 self.assertIsNotNone(eci["contentEncryptionAlgorithm"]["parameters"].defined)
217 _, encryption_params = eci["contentEncryptionAlgorithm"]["parameters"].defined
218 iv = bytes(encryption_params["iv"])
219 self.assertSequenceEqual(
220 cfb_decrypt(cek, ciphertext, iv, sbox=sbox, mesh=True),
225 content_info_raw = b64decode("""
226 MIIKGgYJKoZIhvcNAQcDoIIKCzCCCgcCAQAxggE0MIIBMAIBADBbMFYxKTAnBgkq
227 hkiG9w0BCQEWGkdvc3RSMzQxMC0yMDEyQGV4YW1wbGUuY29tMSkwJwYDVQQDEyBH
228 b3N0UjM0MTAtMjAxMiAyNTYgYml0cyBleGNoYW5nZQIBATAfBggqhQMHAQEBATAT
229 BgcqhQMCAiQABggqhQMHAQECAgSBrDCBqTAoBCCVJxUMdbKRzCJ5K1NWJIXnN7Ul
230 zaceeFlblA2qH4wZrgQEsHnIG6B9BgkqhQMHAQIFAQGgZjAfBggqhQMHAQEBATAT
231 BgcqhQMCAiQABggqhQMHAQECAgNDAARAFoqoLg1lV780co6GdwtjLtS4KCXv9VGR
232 sd7PTPHCT/5iGbvOlKNW2I8UhayJ0dv7RV7Nb1lDIxPxf4Mbp2CikgQI1b4+WpGE
233 sfQwggjIBgkqhkiG9w0BBwEwHwYGKoUDAgIVMBUECHYNkdvFoYdyBgkqhQMHAQIF
234 AQGAggiYvFFpJKILAFdXjcdLLYv4eruXzL/wOXL8y9HHIDMbSzV1GM033J5Yt/p4
235 H6JYe1L1hjAfE/BAAYBndof2sSUxC3/I7xj+b7M8BZ3GYPqATPtR4aCQDK6z91lx
236 nDBAWx0HdsStT5TOj/plMs4zJDadvIJLfjmGkt0Np8FSnSdDPOcJAO/jcwiOPopg
237 +Z8eIuZNmY4seegTLue+7DGqvqi1GdZdMnvXBFIKc9m5DUsC7LdyboqKImh6giZE
238 YZnxb8a2naersPylhrf+zp4Piwwv808yOrD6LliXUiH0RojlmuaQP4wBkb7m073h
239 MeAWEWSvyXzOvOOuFST/hxPEupiTRoHPUdfboJT3tNpizUhE384SrvXHpwpgivQ4
240 J0zF2/uzTBEupXR6dFC9rTHAK3X79SltqBNnHyIXBwe+BMqTmKTfnlPVHBUfTXZg
241 oakDItwKwa1MBOZeciwtUFza+7o9FZhKIandb848chGdgd5O9ksaXvPJDIPxQjZd
242 EBVhnXLlje4TScImwTdvYB8GsI8ljKb2bL3FjwQWGbPaOjXc2D9w+Ore8bk1E4TA
243 ayhypU7MH3Mq1EBZ4j0iROEFBQmYRZn8vAKZ0K7aPxcDeAnKAJxdokqrMkLgI6WX
244 0glh/3Cs9dI+0D2GqMSygauKCD0vTIo3atkEQswDZR4pMx88gB4gmx7iIGrc/ZXs
245 ZqHI7NQqeKtBwv2MCIj+/UTqdYDqbaniDwdVS8PE9nQnNU4gKffq3JbT+wRjJv6M
246 Dr231bQHgAsFTVKbZgoL4gj4V7bLQUmW06+W1BQUJ2+Sn7fp+Xet9Xd3cGtNdxzQ
247 zl6sGuiOlTNe0bfKP7QIMC7ekjflLBx8nwa2GZG19k3O0Z9JcDdN/kz6bGpPNssY
248 AIOkTvLQjxIM9MhRqIv6ee0rowTWQPwXJP7yHApop4XZvVX6h9gG2gazqbDej2lo
249 tAcfRAKj/LJ/bk9+OlNXOXVCKnwE1kXxZDsNJ51GdCungC56U/hmd3C1RhSLTpEc
250 FlOWgXKNjbn6SQrlq1yASKKr80T0fL7PFoYwKZoQbKMAVZQC1VBWQltHkEzdL73x
251 FwgZULNfdflF8sEhFC/zsVqckD/UnhzJz88PtCslMArJ7ntbEF1GzsSSfRfjBqnl
252 kSUreE5XX6+c9yp5HcJBiMzp6ZqqWWaED5Y5xp1hZeYjuKbDMfY4tbWVc7Hy0dD2
253 KGfZLp5umqvPNs7aVBPmvuxtrnxcJlUB8u2HoiHc6/TuhrpaopYGBhxL9+kezuLR
254 v18nsAg8HOmcCNUS46NXQj/Mdpx8W+RsyzCQkJjieT/Yed20Zxq1zJoXIS0xAaUH
255 TdE2dWqiT6TGlh/KQYk3KyFPNnDmzJm04a2VWIwpp4ypXyxrB7XxnVY6Q4YBYbZs
256 FycxGjJWqj7lwc+lgZ8YV2WJ4snEo2os8SsA2GFWcUMiVTHDnEJvphDHmhWsf26A
257 bbRqwaRXNjhj05DamTRsczgvfjdl1pk4lJYE4ES3nixtMe4s1X8nSmM4KvfyVDul
258 J8uTpw1ZFnolTdfEL63BSf4FREoEqKB7cKuD7cpn7Rg4kRdM0/BLZGuxkH+pGMsI
259 Bb8LecUWyjGsI6h74Wz/U2uBrfgdRqhR+UsfB2QLaRgM6kCXZ4vM0auuzBViFCwK
260 tYMHzZWWz8gyVtJ0mzt1DrHCMx4pTS4yOhv4RkXBS/rub4VhVIsOGOGar5ZYtH47
261 uBbdw3NC05JIFM7lI31d0s1fvvkTUR7eaqRW+SnR2c2oHpWlSO+Q0mrzx+vvOTdj
262 xa713YtklBvyUUQr2SIbsXGpFnwjn+sXK1onAavp/tEax8sNZvxg5yeseFcWn+gD
263 4rjk9FiSd1wp4fTDQFJ19evqruqKlq6k18l/ZAyUcEbIWSz2s3HfAAoAQyFPX1Q2
264 95gVhRRw6lP4S6VPCfn/f+5jV4TcT6W/giRaHIk9Hty+g8bx1bFXaKVkQZ5R2Vmk
265 qsZ65ZgCrYQJmcErPmYybvP7NBeDS4AOSgBQAGMQF4xywdNm6bniWWo3N/xkFv32
266 /25x8okGgD8QcYKmhzieLSSzOvM/exB14RO84YZOkZzm01Jll0nac/LEazKoVWbn
267 0VdcQ7pYEOqeMBXipsicNVYA/uhonp6op9cpIVYafPr0npCGwwhwcRuOrgSaZyCn
268 VG2tPkEOv9LKmUbhnaDA2YUSzOOjcCpIVvTSBnUEiorYpfRYgQLrbcd2qhVvNCLX
269 8ujZfMqXQXK8n5BK8JxNtczvaf+/2dfv1dQl0lHEAQhbNcsJ0t5GPhsSCC5oMBJl
270 ZJuOEO/8PBWKEnMZOM+Dz7gEgsBhGyMFFrKpiwQRpyEshSD2QpnK6Lp0t5C8Za2G
271 lhyZsEr+93AYOb5mm5+z02B4Yq9+RpepvjoqVeq/2uywZNq9MS98zVgNsmpryvTZ
272 3HJHHB20u2jcVu0G3Nhiv22lD70JWCYFAOupjgVcUcaBxjxwUMAvgHg7JZqs6mC6
273 tvTKwQ4NtDhoAhARlDeWSwCWb2vPH2H7Lmqokif1RfvJ0hrLzkJuHdWrzIYzXpPs
274 +v9XJxLvbdKi9KU1Halq9S8dXT1fvs9DJTpUV/KW7QkRsTQJhTJBkQ07WUSJ4gBS
275 Qp4efxSRNIfMj7DR6qLLf13RpIPTJO9/+gNuBIFcupWVfUL7tJZt8Qsf9eGwZfP+
276 YyhjC8AyZjH4/9RzLHSjuq6apgw3Mzw0j572Xg6xDLMK8C3Tn/vrLOvAd96b9MkF
277 3+ZHSLW3IgOiy+1jvK/20CZxNWc+pey8v4zji1hI17iohsipX/uZKRxhxF6+Xn2R
278 UQp6qoxHAspNXgWQ57xg7C3+gmi4ciVr0fT9pg54ogcowrRH+I6wd0EpeWPbzfnQ
279 pRmMVN+YtRsrEHwH3ToQ/i4vrtgA+eONuKT2uKZFikxA+VNmeeGdhkgqETMihQ==
281 prv_key_our = hexdec("BFCF1D623E5CDD3032A7C6EABB4A923C46E43D640FFEAAF2C3ED39A8FA399924")[::-1]
283 def keker(curve, prv, pub, ukm):
284 return kek_34102012256(
295 "id-GostR3410-2001-CryptoPro-XchA-ParamSet",
297 b"Test data to encrypt.\n" * 100,
301 content_info_raw = b64decode("""
302 MIIB0gYJKoZIhvcNAQcDoIIBwzCCAb8CAQAxggF8MIIBeAIBADBbMFYxKTAnBgkq
303 hkiG9w0BCQEWGkdvc3RSMzQxMC0yMDEyQGV4YW1wbGUuY29tMSkwJwYDVQQDEyBH
304 b3N0UjM0MTAtMjAxMiA1MTIgYml0cyBleGNoYW5nZQIBATAhBggqhQMHAQEBAjAV
305 BgkqhQMHAQIBAgIGCCqFAwcBAQIDBIHyMIHvMCgEIIsYzbVLn33aLinQ7SLNA7y+
306 Lrm02khqDCfXrNS9iiMhBATerS8zoIHCBgkqhQMHAQIFAQGggaowIQYIKoUDBwEB
307 AQIwFQYJKoUDBwECAQICBggqhQMHAQECAwOBhAAEgYAYiTVLKpSGaAvjJEDQ0hdK
308 qR/jek5Q9Q2pXC+NkOimQh7dpCi+wcaHlPcBk96hmpnOFvLaiokX8V6jqtBl5gdk
309 M40kOXv8kcDdTzEVKA/ZLxA8xanL+gTD6ZjaPsUu06nsA2MoMBWcHLUzueaP3bGT
310 /yHTV+Za5xdcQehag/lNBgQIvCw4uUl0XC4wOgYJKoZIhvcNAQcBMB8GBiqFAwIC
311 FTAVBAj+1QzaXaN9FwYJKoUDBwECBQEBgAyK54euw0sHhEVEkA0=
313 prv_key_our = hexdec("3FC01CDCD4EC5F972EB482774C41E66DB7F380528DFE9E67992BA05AEE462435757530E641077CE587B976C8EEB48C48FD33FD175F0C7DE6A44E014E6BCB074B")[::-1]
315 def keker(curve, prv, pub, ukm):
316 return kek_34102012256(
319 pub_unmarshal(pub, mode=2012),
326 "id-tc26-gost-3410-12-512-paramSetB",
332 @skipIf(not pyderasn_exists, "PyDERASN dependency is required")
333 class TestEnvelopedKARI(TestCase):
334 """EnvelopedData KeyAgreeRecipientInfo-based test vectors from
335 "Использование алгоритмов ГОСТ 28147-89, ГОСТ Р 34.11 и ГОСТ Р 34.10
336 в криптографических сообщениях формата CMS" (TK26CMS.pdf)
347 sbox = "id-tc26-gost-28147-param-Z"
348 content_info, tail = ContentInfo().decode(content_info_raw, ctx={
353 DecodePathDefBy(id_envelopedData),
366 id_tc26_gost3410_2012_256: OctetString(),
367 id_tc26_gost3410_2012_512: OctetString(),
372 id_tc26_gost3410_2012_256,
373 id_tc26_gost3410_2012_512,
377 self.assertSequenceEqual(tail, b"")
378 self.assertIsNotNone(content_info["content"].defined)
379 _, enveloped_data = content_info["content"].defined
380 eci = enveloped_data["encryptedContentInfo"]
381 kari = enveloped_data["recipientInfos"][0]["kari"]
382 self.assertIsNotNone(kari["originator"]["originatorKey"]["publicKey"].defined)
383 _, pub_key_their = kari["originator"]["originatorKey"]["publicKey"].defined
384 ukm = bytes(kari["ukm"])
385 rek = kari["recipientEncryptedKeys"][0]
386 curve = CURVES[curve_name]
387 kek = keker(curve, prv_key_our, bytes(pub_key_their), ukm)
388 self.assertIsNotNone(rek["encryptedKey"].defined)
389 _, encrypted_key = rek["encryptedKey"].defined
390 key_wrapped = bytes(encrypted_key["encryptedKey"])
391 mac = bytes(encrypted_key["macKey"])
392 cek = unwrap_gost(kek, ukm + key_wrapped + mac, sbox=sbox)
393 ciphertext = bytes(eci["encryptedContent"])
394 self.assertIsNotNone(eci["contentEncryptionAlgorithm"]["parameters"].defined)
395 _, encryption_params = eci["contentEncryptionAlgorithm"]["parameters"].defined
396 iv = bytes(encryption_params["iv"])
397 self.assertSequenceEqual(
398 cfb_decrypt(cek, ciphertext, iv, sbox=sbox, mesh=True),
403 content_info_raw = b64decode("""
404 MIIBhgYJKoZIhvcNAQcDoIIBdzCCAXMCAQIxggEwoYIBLAIBA6BooWYwHwYIKoUD
405 BwEBAQEwEwYHKoUDAgIkAAYIKoUDBwEBAgIDQwAEQPAdWM4pO38iZ49UjaXQpq+a
406 jhTa4KwY4B9TFMK7AiYmbFKE0eX/wvu69kFMQ2o3OJTnMOlr1WHiPYOmNO6C5hOh
407 CgQIX+vNomZakEIwIgYIKoUDBwEBAQEwFgYHKoUDAgINADALBgkqhQMHAQIFAQEw
408 gYwwgYkwWzBWMSkwJwYJKoZIhvcNAQkBFhpHb3N0UjM0MTAtMjAxMkBleGFtcGxl
409 LmNvbTEpMCcGA1UEAxMgR29zdFIzNDEwLTIwMTIgMjU2IGJpdHMgZXhjaGFuZ2UC
410 AQEEKjAoBCCNhrZOr7x2fsjjQAeDMv/tSoNRQSSQzzxgqdnYxJ3fIAQEgYLqVDA6
411 BgkqhkiG9w0BBwEwHwYGKoUDAgIVMBUECHVmR/S+hlYiBgkqhQMHAQIFAQGADEI9
414 prv_key_our = hexdec("BFCF1D623E5CDD3032A7C6EABB4A923C46E43D640FFEAAF2C3ED39A8FA399924")[::-1]
416 def keker(curve, prv, pub, ukm):
417 return kek_34102012256(
428 "id-GostR3410-2001-CryptoPro-XchA-ParamSet",
434 content_info_raw = b64decode("""
435 MIIBzAYJKoZIhvcNAQcDoIIBvTCCAbkCAQIxggF2oYIBcgIBA6CBraGBqjAhBggq
436 hQMHAQEBAjAVBgkqhQMHAQIBAgIGCCqFAwcBAQIDA4GEAASBgCB0nQy/Ljva/mRj
437 w6o+eDKIvnxwYIQB5XCHhZhCpHNZiWcFxFpYXZLWRPKifOxV7NStvqGE1+fkfhBe
438 btkQu0tdC1XL3LO2Cp/jX16XhW/IP5rKV84qWr1Owy/6tnSsNRb+ez6IttwVvaVV
439 pA6ONFy9p9gawoC8nitvAVJkWW0PoQoECDVfxzxgMTAHMCIGCCqFAwcBAQECMBYG
440 ByqFAwICDQAwCwYJKoUDBwECBQEBMIGMMIGJMFswVjEpMCcGCSqGSIb3DQEJARYa
441 R29zdFIzNDEwLTIwMTJAZXhhbXBsZS5jb20xKTAnBgNVBAMTIEdvc3RSMzQxMC0y
442 MDEyIDUxMiBiaXRzIGV4Y2hhbmdlAgEBBCowKAQg8C/OcxRR0Uq8nDjHrQlayFb3
443 WFUZEnEuAKcuG6dTOawEBLhi9hIwOgYJKoZIhvcNAQcBMB8GBiqFAwICFTAVBAiD
444 1wH+CX6CwgYJKoUDBwECBQEBgAzUvQI4H2zRfgNgdlY=
446 prv_key_our = hexdec("3FC01CDCD4EC5F972EB482774C41E66DB7F380528DFE9E67992BA05AEE462435757530E641077CE587B976C8EEB48C48FD33FD175F0C7DE6A44E014E6BCB074B")[::-1]
448 def keker(curve, prv, pub, ukm):
449 return kek_34102012256(
452 pub_unmarshal(pub, mode=2012),
459 "id-tc26-gost-3410-12-512-paramSetB",