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from datetime import datetime, timedelta
from typing import Tuple
from cryptography import x509
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.x509.oid import NameOID
def make_tls_cert(hostname: str) -> Tuple[x509.Certificate, rsa.RSAPrivateKey]:
key = rsa.generate_private_key(
public_exponent=65537, key_size=2048, backend=default_backend()
)
subject = issuer = x509.Name(
[
x509.NameAttribute(NameOID.COMMON_NAME, hostname),
]
)
cert = (
x509.CertificateBuilder()
.subject_name(subject)
.issuer_name(issuer)
.public_key(key.public_key())
.serial_number(x509.random_serial_number())
.not_valid_before(datetime.utcnow())
.not_valid_after(datetime.utcnow() + timedelta(days=10))
.add_extension(
x509.SubjectAlternativeName([x509.DNSName(hostname)]),
critical=False,
)
.sign(key, hashes.SHA256(), default_backend())
)
return cert, key
def serialize_key(key: rsa.RSAPrivateKey) -> bytes:
return key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.TraditionalOpenSSL,
encryption_algorithm=serialization.NoEncryption(),
)
def serialize_cert(cert: x509.Certificate) -> bytes:
return cert.public_bytes(serialization.Encoding.PEM)
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