from datetime import datetime
from datetime import timedelta
from os import urandom
+from sys import stdout
from textwrap import fill
from pyderasn import Any
from pyderasn import UTCTime
from pygost.asn1schemas.oids import id_at_commonName
+from pygost.asn1schemas.oids import id_at_countryName
from pygost.asn1schemas.oids import id_ce_authorityKeyIdentifier
from pygost.asn1schemas.oids import id_ce_basicConstraints
from pygost.asn1schemas.oids import id_ce_keyUsage
from pygost.gost3410 import sign
from pygost.gost34112012256 import GOST34112012256
from pygost.gost34112012512 import GOST34112012512
+from pygost.utils import bytes2long
parser = ArgumentParser(description="Self-signed X.509 certificate creator")
parser.add_argument(
required=True,
help="Subject's CommonName",
)
+parser.add_argument(
+ "--country",
+ help="Subject's Country",
+)
+parser.add_argument(
+ "--serial",
+ help="Serial number",
+)
parser.add_argument(
"--ai",
required=True,
"--issue-with",
help="Path to PEM with CA to issue the child",
)
+parser.add_argument(
+ "--reuse-key",
+ help="Path to PEM with the key to reuse",
+)
+parser.add_argument(
+ "--out-key",
+ help="Path to PEM with the resulting key",
+)
+parser.add_argument(
+ "--only-key",
+ action="store_true",
+ help="Only generate the key",
+)
+parser.add_argument(
+ "--out-cert",
+ help="Path to PEM with the resulting certificate",
+)
args = parser.parse_args()
AIs = {
"256A": {
if params["publicKeyParamSet"] == curve_oid
]))
+key_params = GostR34102012PublicKeyParameters((
+ ("publicKeyParamSet", ai["publicKeyParamSet"]),
+))
+
def pem(obj):
return fill(standard_b64encode(obj.encode()).decode("ascii"), 64)
-key_params = GostR34102012PublicKeyParameters((
- ("publicKeyParamSet", ai["publicKeyParamSet"]),
-))
-
-prv_raw = urandom(ai["prv_len"])
-print("-----BEGIN PRIVATE KEY-----")
-print(pem(PrivateKeyInfo((
- ("version", Integer(0)),
- ("privateKeyAlgorithm", PrivateKeyAlgorithmIdentifier((
- ("algorithm", ai["key_algorithm"]),
- ("parameters", Any(key_params)),
- ))),
- ("privateKey", PrivateKey(OctetString(prv_raw).encode())),
-))))
-print("-----END PRIVATE KEY-----")
+if args.reuse_key is not None:
+ with open(args.reuse_key, "rb") as fd:
+ lines = fd.read().decode("ascii").split("-----")
+ idx = lines.index("BEGIN PRIVATE KEY")
+ if idx == -1:
+ raise ValueError("PEM has no PRIVATE KEY")
+ prv_raw = standard_b64decode(lines[idx + 1])
+ pki = PrivateKeyInfo().decod(prv_raw)
+ prv = prv_unmarshal(bytes(OctetString().decod(bytes(pki["privateKey"]))))
+else:
+ prv_raw = urandom(ai["prv_len"])
+ out = stdout if args.out_key is None else open(args.out_key, "w")
+ print("-----BEGIN PRIVATE KEY-----", file=out)
+ print(pem(PrivateKeyInfo((
+ ("version", Integer(0)),
+ ("privateKeyAlgorithm", PrivateKeyAlgorithmIdentifier((
+ ("algorithm", ai["key_algorithm"]),
+ ("parameters", Any(key_params)),
+ ))),
+ ("privateKey", PrivateKey(OctetString(prv_raw).encode())),
+ ))), file=out)
+ print("-----END PRIVATE KEY-----", file=out)
+ if args.only_key:
+ exit()
+ prv = prv_unmarshal(prv_raw)
-prv = prv_unmarshal(prv_raw)
curve = ai["curve"]
pub_raw = pub_marshal(public_key(curve, prv))
-subj = Name(("rdnSequence", RDNSequence([
- RelativeDistinguishedName((
+rdn = [RelativeDistinguishedName((
+ AttributeTypeAndValue((
+ ("type", AttributeType(id_at_commonName)),
+ ("value", AttributeValue(PrintableString(args.cn))),
+ )),
+))]
+if args.country:
+ rdn.append(RelativeDistinguishedName((
AttributeTypeAndValue((
- ("type", AttributeType(id_at_commonName)),
- ("value", AttributeValue(PrintableString(args.cn))),
+ ("type", AttributeType(id_at_countryName)),
+ ("value", AttributeValue(PrintableString(args.country))),
)),
- ))
-])))
+ )))
+subj = Name(("rdnSequence", RDNSequence(rdn)))
not_before = datetime.utcnow()
not_after = not_before + timedelta(days=365 * (10 if args.ca else 1))
ai_sign = AlgorithmIdentifier((
exts = [
Extension((
("extnID", id_ce_subjectKeyIdentifier),
-
("extnValue", OctetString(
SubjectKeyIdentifier(GOST34112012256(pub_raw).digest()[:20]).encode()
)),
)),
Extension((
- ("extnID", id_ce_subjectAltName),
- ("extnValue", OctetString(
- SubjectAltName((
- GeneralName(("dNSName", IA5String(args.cn))),
- )).encode()
- )),
+ ("extnID", id_ce_keyUsage),
+ ("critical", Boolean(True)),
+ ("extnValue", OctetString(KeyUsage(
+ ("keyCertSign" if args.ca else "digitalSignature",),
+ ).encode())),
)),
]
if args.ca:
("cA", Boolean(True)),
)).encode())),
)))
+else:
exts.append(Extension((
- ("extnID", id_ce_keyUsage),
- ("critical", Boolean(True)),
- ("extnValue", OctetString(KeyUsage(("keyCertSign",)).encode())),
+ ("extnID", id_ce_subjectAltName),
+ ("extnValue", OctetString(
+ SubjectAltName((
+ GeneralName(("dNSName", IA5String(args.cn))),
+ )).encode()
+ )),
)))
if ca_ai is not None:
caKeyId = [
)).encode())),
)))
+serial = (
+ bytes2long(GOST34112012256(urandom(16)).digest()[:20])
+ if args.serial is None else int(args.serial)
+)
tbs = TBSCertificate((
("version", Version("v3")),
- ("serialNumber", CertificateSerialNumber(12345)),
+ ("serialNumber", CertificateSerialNumber(serial)),
("signature", ai_sign),
("issuer", subj if ca_ai is None else ca_subj),
("validity", Validity((
sign(ca_ai["curve"], ca_prv, ca_ai["hasher"](tbs.encode()).digest()[::-1])
)),
))
-print("-----BEGIN CERTIFICATE-----")
-print(pem(cert))
-print("-----END CERTIFICATE-----")
+out = stdout if args.out_cert is None else open(args.out_cert, "w")
+print("-----BEGIN CERTIFICATE-----", file=out)
+print(pem(cert), file=out)
+print("-----END CERTIFICATE-----", file=out)