/
example.py
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/
example.py
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from cryptography import x509
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.x509.oid import NameOID
import datetime
import http.server, ssl
if __name__ == '__main__':
# Generate the issuer's RSA public-private key pair
issuer_rsa = rsa.generate_private_key(
public_exponent=65537,
key_size=2048,
)
# Generate the issuer's certificate
issuer_cert_name = x509.Name(
[x509.NameAttribute(NameOID.COUNTRY_NAME, "CZ"),
x509.NameAttribute(NameOID.STATE_OR_PROVINCE_NAME, "Prague"),
x509.NameAttribute(NameOID.LOCALITY_NAME, "Prague"),
x509.NameAttribute(NameOID.ORGANIZATION_NAME, "DesignPatternsInTheWild"),
x509.NameAttribute(NameOID.COMMON_NAME, "DesignPatternsInTheWildCA")]
)
issuer_cert_duration = 3650 * datetime.timedelta(1, 0, 0)
issuer_certificate = (
x509.CertificateBuilder()
.subject_name(issuer_cert_name)
.issuer_name(issuer_cert_name)
.not_valid_before(datetime.datetime.today() - datetime.timedelta(1, 0, 0))
.not_valid_after(datetime.datetime.today() + issuer_cert_duration)
.public_key(issuer_rsa.public_key())
.serial_number(x509.random_serial_number())
.add_extension(
x509.BasicConstraints(
ca=True,
path_length=None
),
critical=True,
)
.add_extension(
x509.KeyUsage(
digital_signature=False,
content_commitment=False,
key_encipherment=False,
data_encipherment=False,
key_agreement=False,
key_cert_sign=True,
crl_sign=True,
encipher_only=False,
decipher_only=False,
),
critical=False,
)
.sign(private_key=issuer_rsa, algorithm=hashes.SHA256())
)
# Generate the server's RSA public-private key pair
server_rsa = rsa.generate_private_key(
public_exponent=65537,
key_size=2048,
)
# Generate the server's certificate
server_cert_name = x509.Name(
[x509.NameAttribute(NameOID.COUNTRY_NAME, "CZ"),
x509.NameAttribute(NameOID.STATE_OR_PROVINCE_NAME, "Prague"),
x509.NameAttribute(NameOID.LOCALITY_NAME, "Prague"),
x509.NameAttribute(NameOID.ORGANIZATION_NAME, "DesignPatternsInTheWild"),
x509.NameAttribute(NameOID.COMMON_NAME, "DesignPatternsInTheWildServer")]
)
server_certificate_duration = 30 * datetime.timedelta(1, 0, 0)
server_certificate = (
x509.CertificateBuilder()
.subject_name(x509.Name(server_cert_name))
.issuer_name(issuer_certificate.subject)
.not_valid_before(datetime.datetime.today() - datetime.timedelta(1, 0, 0))
.not_valid_after(datetime.datetime.today() + server_certificate_duration)
.public_key(server_rsa.public_key())
.serial_number(x509.random_serial_number())
.add_extension(
x509.BasicConstraints(
ca=False,
path_length=None
),
critical=True,
)
.add_extension(
x509.ExtendedKeyUsage([x509.ExtendedKeyUsageOID.SERVER_AUTH]),
critical=False,
)
.add_extension(
x509.SubjectAlternativeName([x509.DNSName(u'localhost')]),
critical=True,
)
.add_extension(
x509.KeyUsage(
digital_signature=True,
content_commitment=False,
key_encipherment=False,
data_encipherment=True,
key_agreement=True,
key_cert_sign=False,
crl_sign=False,
encipher_only=False,
decipher_only=False,
),
critical=False,
)
.sign(private_key=issuer_rsa, algorithm=hashes.SHA256())
)
# Write CA's certificate and server' certificate and private key to file
with open("ca.cert.pem", "wb") as f:
f.write(issuer_certificate.public_bytes(serialization.Encoding.PEM))
with open("server.key.pem", "wb") as f:
f.write(
server_rsa.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.TraditionalOpenSSL,
encryption_algorithm=serialization.NoEncryption(),
)
)
with open("server.cert.pem", "wb") as f:
f.write(server_certificate.public_bytes(serialization.Encoding.PEM))
# Start an HTTPS endpoint
context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
context.load_cert_chain('server.cert.pem', 'server.key.pem')
httpd = http.server.HTTPServer(('localhost', 443), http.server.SimpleHTTPRequestHandler)
httpd.socket = context.wrap_socket(httpd.socket, server_side=True)
httpd.serve_forever()