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gencert.py
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gencert.py
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import os
import datetime
from cryptography import x509
from cryptography.x509.oid import NameOID
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import rsa
def gencert():
filename = os.path.dirname(os.path.abspath(__file__)) + '/tempcert.pem'
certfile = open(filename, 'wb')
# Generate our key
key = rsa.generate_private_key(
public_exponent=65537,
key_size=2048,
backend=default_backend()
)
certfile.write(key.private_bytes(encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.TraditionalOpenSSL,
encryption_algorithm=serialization.NoEncryption()))
subject = issuer = x509.Name([
x509.NameAttribute(NameOID.COUNTRY_NAME, u"US"),
x509.NameAttribute(NameOID.STATE_OR_PROVINCE_NAME, u"CA"),
x509.NameAttribute(NameOID.LOCALITY_NAME, u"San Francisco"),
x509.NameAttribute(NameOID.ORGANIZATION_NAME, u"My Company"),
x509.NameAttribute(NameOID.COMMON_NAME, u"example.com"),
])
cert = (x509.CertificateBuilder()
.subject_name(subject)
.issuer_name(issuer)
.public_key(key.public_key())
.serial_number(x509.random_serial_number())
.not_valid_before(datetime.datetime.utcnow())
.not_valid_after(datetime.datetime.utcnow() + datetime.timedelta(days=365))
.add_extension(x509.SubjectAlternativeName([x509.DNSName(u"localhost")]), critical=False,)
.sign(key, hashes.SHA256(), default_backend()))
certfile.write(cert.public_bytes(serialization.Encoding.PEM))
certfile.close()
return filename