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import os
from datetime import datetime, timedelta
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.hazmat.primitives.hashes import SHA256
from cryptography.hazmat.primitives.serialization import (
Encoding,
NoEncryption,
PrivateFormat,
)
from cryptography.x509 import (
CertificateBuilder,
DNSName,
Name,
NameAttribute,
random_serial_number,
SubjectAlternativeName,
)
from cryptography.x509.oid import NameOID
# https://cryptography.io/en/latest/x509/tutorial/#creating-a-self-signed-certificate
def generate_keys():
folder = os.path.dirname(__file__)
key = rsa.generate_private_key(
public_exponent=65537,
key_size=2048,
backend=default_backend(),
)
with open(os.path.join(folder, 'localhost.key'), "wb") as f:
f.write(
key.private_bytes(
encoding=Encoding.PEM,
format=PrivateFormat.TraditionalOpenSSL,
encryption_algorithm=NoEncryption(),
)
)
subject = issuer = Name(
[
NameAttribute(NameOID.COUNTRY_NAME, u"IE"),
NameAttribute(NameOID.ORGANIZATION_NAME, u"Scrapy"),
NameAttribute(NameOID.COMMON_NAME, u"localhost"),
]
)
cert = (
CertificateBuilder()
.subject_name(subject)
.issuer_name(issuer)
.public_key(key.public_key())
.serial_number(random_serial_number())
.not_valid_before(datetime.utcnow())
.not_valid_after(datetime.utcnow() + timedelta(days=10))
.add_extension(
SubjectAlternativeName([DNSName(u"localhost")]),
critical=False,
)
.sign(key, SHA256(), default_backend())
)
with open(os.path.join(folder, 'localhost.crt'), "wb") as f:
f.write(cert.public_bytes(Encoding.PEM))
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