pygost/asn1schemas/cert-selfsigned-example.py

   1 """Create example self-signed X.509 certificate
   2 """
   3
   4 from argparse import ArgumentParser
   5 from base64 import standard_b64encode
   6 from datetime import datetime
   7 from datetime import timedelta
   8 from os import urandom
   9 from textwrap import fill
  10
  11 from pyderasn import Any
  12 from pyderasn import BitString
  13 from pyderasn import Boolean
  14 from pyderasn import IA5String
  15 from pyderasn import Integer
  16 from pyderasn import OctetString
  17 from pyderasn import PrintableString
  18 from pyderasn import UTCTime
  19
  20 from pygost.asn1schemas.oids import id_at_commonName
  21 from pygost.asn1schemas.oids import id_ce_basicConstraints
  22 from pygost.asn1schemas.oids import id_ce_subjectAltName
  23 from pygost.asn1schemas.oids import id_ce_subjectKeyIdentifier
  24 from pygost.asn1schemas.oids import id_tc26_gost3410_2012_256
  25 from pygost.asn1schemas.oids import id_tc26_gost3410_2012_256_paramSetA
  26 from pygost.asn1schemas.oids import id_tc26_gost3410_2012_256_paramSetB
  27 from pygost.asn1schemas.oids import id_tc26_gost3410_2012_256_paramSetC
  28 from pygost.asn1schemas.oids import id_tc26_gost3410_2012_256_paramSetD
  29 from pygost.asn1schemas.oids import id_tc26_gost3410_2012_512
  30 from pygost.asn1schemas.oids import id_tc26_gost3410_2012_512_paramSetA
  31 from pygost.asn1schemas.oids import id_tc26_gost3410_2012_512_paramSetB
  32 from pygost.asn1schemas.oids import id_tc26_gost3410_2012_512_paramSetC
  33 from pygost.asn1schemas.oids import id_tc26_signwithdigest_gost3410_2012_256
  34 from pygost.asn1schemas.oids import id_tc26_signwithdigest_gost3410_2012_512
  35 from pygost.asn1schemas.prvkey import PrivateKey
  36 from pygost.asn1schemas.prvkey import PrivateKeyAlgorithmIdentifier
  37 from pygost.asn1schemas.prvkey import PrivateKeyInfo
  38 from pygost.asn1schemas.x509 import AlgorithmIdentifier
  39 from pygost.asn1schemas.x509 import AttributeType
  40 from pygost.asn1schemas.x509 import AttributeTypeAndValue
  41 from pygost.asn1schemas.x509 import AttributeValue
  42 from pygost.asn1schemas.x509 import BasicConstraints
  43 from pygost.asn1schemas.x509 import Certificate
  44 from pygost.asn1schemas.x509 import CertificateSerialNumber
  45 from pygost.asn1schemas.x509 import Extension
  46 from pygost.asn1schemas.x509 import Extensions
  47 from pygost.asn1schemas.x509 import GeneralName
  48 from pygost.asn1schemas.x509 import GostR34102012PublicKeyParameters
  49 from pygost.asn1schemas.x509 import Name
  50 from pygost.asn1schemas.x509 import RDNSequence
  51 from pygost.asn1schemas.x509 import RelativeDistinguishedName
  52 from pygost.asn1schemas.x509 import SubjectAltName
  53 from pygost.asn1schemas.x509 import SubjectKeyIdentifier
  54 from pygost.asn1schemas.x509 import SubjectPublicKeyInfo
  55 from pygost.asn1schemas.x509 import TBSCertificate
  56 from pygost.asn1schemas.x509 import Time
  57 from pygost.asn1schemas.x509 import Validity
  58 from pygost.asn1schemas.x509 import Version
  59 from pygost.gost3410 import CURVES
  60 from pygost.gost3410 import prv_unmarshal
  61 from pygost.gost3410 import pub_marshal
  62 from pygost.gost3410 import public_key
  63 from pygost.gost3410 import sign
  64 from pygost.gost34112012256 import GOST34112012256
  65 from pygost.gost34112012512 import GOST34112012512
  66
  67 parser = ArgumentParser(description="Self-signed X.509 certificate creator")
  68 parser.add_argument(
  69     "--ca",
  70     action="store_true",
  71     help="Enable BasicConstraints.cA",
  72 )
  73 parser.add_argument(
  74     "--cn",
  75     required=True,
  76     help="Subject's CommonName",
  77 )
  78 parser.add_argument(
  79     "--ai",
  80     required=True,
  81     help="Signing algorithm: {256[ABCD],512[ABC]}",
  82 )
  83 args = parser.parse_args()
  84 ai = {
  85     "256A": {
  86         "publicKeyParamSet": id_tc26_gost3410_2012_256_paramSetA,
  87         "key_algorithm": id_tc26_gost3410_2012_256,
  88         "prv_len": 32,
  89         "curve": CURVES["id-tc26-gost-3410-2012-256-paramSetA"],
  90         "sign_algorithm": id_tc26_signwithdigest_gost3410_2012_256,
  91         "hasher": GOST34112012256,
  92     },
  93     "256B": {
  94         "publicKeyParamSet": id_tc26_gost3410_2012_256_paramSetB,
  95         "key_algorithm": id_tc26_gost3410_2012_256,
  96         "prv_len": 32,
  97         "curve": CURVES["id-tc26-gost-3410-2012-256-paramSetB"],
  98         "sign_algorithm": id_tc26_signwithdigest_gost3410_2012_256,
  99         "hasher": GOST34112012256,
 100     },
 101     "256C": {
 102         "publicKeyParamSet": id_tc26_gost3410_2012_256_paramSetC,
 103         "key_algorithm": id_tc26_gost3410_2012_256,
 104         "prv_len": 32,
 105         "curve": CURVES["id-tc26-gost-3410-2012-256-paramSetC"],
 106         "sign_algorithm": id_tc26_signwithdigest_gost3410_2012_256,
 107         "hasher": GOST34112012256,
 108     },
 109     "256D": {
 110         "publicKeyParamSet": id_tc26_gost3410_2012_256_paramSetD,
 111         "key_algorithm": id_tc26_gost3410_2012_256,
 112         "prv_len": 32,
 113         "curve": CURVES["id-tc26-gost-3410-2012-256-paramSetD"],
 114         "sign_algorithm": id_tc26_signwithdigest_gost3410_2012_256,
 115         "hasher": GOST34112012256,
 116     },
 117     "512A": {
 118         "publicKeyParamSet": id_tc26_gost3410_2012_512_paramSetA,
 119         "key_algorithm": id_tc26_gost3410_2012_512,
 120         "prv_len": 64,
 121         "curve": CURVES["id-tc26-gost-3410-12-512-paramSetA"],
 122         "sign_algorithm": id_tc26_signwithdigest_gost3410_2012_512,
 123         "hasher": GOST34112012512,
 124     },
 125     "512B": {
 126         "publicKeyParamSet": id_tc26_gost3410_2012_512_paramSetB,
 127         "key_algorithm": id_tc26_gost3410_2012_512,
 128         "prv_len": 64,
 129         "curve": CURVES["id-tc26-gost-3410-12-512-paramSetB"],
 130         "sign_algorithm": id_tc26_signwithdigest_gost3410_2012_512,
 131         "hasher": GOST34112012512,
 132     },
 133     "512C": {
 134         "publicKeyParamSet": id_tc26_gost3410_2012_512_paramSetC,
 135         "key_algorithm": id_tc26_gost3410_2012_512,
 136         "prv_len": 64,
 137         "curve": CURVES["id-tc26-gost-3410-2012-512-paramSetC"],
 138         "sign_algorithm": id_tc26_signwithdigest_gost3410_2012_512,
 139         "hasher": GOST34112012512,
 140     },
 141 }[args.ai]
 142
 143
 144 def pem(obj):
 145     return fill(standard_b64encode(obj.encode()).decode("ascii"), 64)
 146
 147
 148 key_params = GostR34102012PublicKeyParameters((
 149     ("publicKeyParamSet", ai["publicKeyParamSet"]),
 150 ))
 151
 152 prv_raw = urandom(ai["prv_len"])
 153 print("-----BEGIN PRIVATE KEY-----")
 154 print(pem(PrivateKeyInfo((
 155     ("version", Integer(0)),
 156     ("privateKeyAlgorithm", PrivateKeyAlgorithmIdentifier((
 157         ("algorithm", ai["key_algorithm"]),
 158         ("parameters", Any(key_params)),
 159     ))),
 160     ("privateKey", PrivateKey(OctetString(prv_raw).encode())),
 161 ))))
 162 print("-----END PRIVATE KEY-----")
 163
 164 prv = prv_unmarshal(prv_raw)
 165 curve = ai["curve"]
 166 pub_raw = pub_marshal(public_key(curve, prv))
 167 subj = Name(("rdnSequence", RDNSequence([
 168     RelativeDistinguishedName((
 169         AttributeTypeAndValue((
 170             ("type", AttributeType(id_at_commonName)),
 171             ("value", AttributeValue(PrintableString(args.cn))),
 172         )),
 173     ))
 174 ])))
 175 not_before = datetime.utcnow()
 176 not_after = not_before + timedelta(days=365)
 177 ai_sign = AlgorithmIdentifier((
 178     ("algorithm", ai["sign_algorithm"],),
 179 ))
 180 exts = [
 181     Extension((
 182         ("extnID", id_ce_subjectKeyIdentifier),
 183         ("extnValue", OctetString(
 184             SubjectKeyIdentifier(GOST34112012256(pub_raw).digest()[:20]).encode()
 185         )),
 186     )),
 187     Extension((
 188         ("extnID", id_ce_subjectAltName),
 189         ("extnValue", OctetString(
 190             SubjectAltName((
 191                 GeneralName(("dNSName", IA5String(args.cn))),
 192             )).encode()
 193         )),
 194     )),
 195 ]
 196 if args.ca:
 197     exts.append(Extension((
 198         ("extnID", id_ce_basicConstraints),
 199         ("extnValue", OctetString(BasicConstraints((("cA", Boolean(True)),)).encode())),
 200     )))
 201 tbs = TBSCertificate((
 202     ("version", Version("v3")),
 203     ("serialNumber", CertificateSerialNumber(12345)),
 204     ("signature", ai_sign),
 205     ("issuer", subj),
 206     ("validity", Validity((
 207         ("notBefore", Time(("utcTime", UTCTime(not_before)))),
 208         ("notAfter", Time(("utcTime", UTCTime(not_after)))),
 209     ))),
 210     ("subject", subj),
 211     ("subjectPublicKeyInfo", SubjectPublicKeyInfo((
 212         ("algorithm", AlgorithmIdentifier((
 213             ("algorithm", ai["key_algorithm"]),
 214             ("parameters", Any(key_params)),
 215         ))),
 216         ("subjectPublicKey", BitString(OctetString(pub_raw).encode())),
 217     ))),
 218     ("extensions", Extensions(exts)),
 219 ))
 220 cert = Certificate((
 221     ("tbsCertificate", tbs),
 222     ("signatureAlgorithm", ai_sign),
 223     ("signatureValue", BitString(sign(
 224         curve,
 225         prv,
 226         ai["hasher"](tbs.encode()).digest()[::-1],
 227     ))),
 228 ))
 229 print("-----BEGIN CERTIFICATE-----")
 230 print(pem(cert))
 231 print("-----END CERTIFICATE-----")