def keygen(pub_key, priv_key, user_id, priv_key_password=None):
"""Generate new private key and certificate RSA_SHA512_4096"""
# Generate our key
key = rsa.generate_private_key(public_exponent=65537, key_size=4096,
backend=default_backend())
if priv_key_password:
ea = serialization.BestAvailableEncryption(priv_key_password)
else:
ea = serialization.NoEncryption()
# Write our key to disk for safe keeping
with open(priv_key, "wb") as f:
f.write(key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.TraditionalOpenSSL,
encryption_algorithm=ea,
))
# Various details about who we are. For a self-signed certificate the
# subject and issuer are always the same.
subject = issuer = x509.Name([
x509.NameAttribute(NameOID.COUNTRY_NAME, "XX"),
x509.NameAttribute(NameOID.STATE_OR_PROVINCE_NAME, "XX"),
x509.NameAttribute(NameOID.LOCALITY_NAME, "XX"),
x509.NameAttribute(NameOID.ORGANIZATION_NAME, "I2P Anonymous Network"),
x509.NameAttribute(NameOID.ORGANIZATIONAL_UNIT_NAME, "I2P"),
x509.NameAttribute(NameOID.COMMON_NAME, user_id),
])
cert = x509.CertificateBuilder() \
.subject_name(subject) \
.issuer_name(issuer) \
.public_key(key.public_key()) \
.not_valid_before(datetime.datetime.utcnow()) \
.not_valid_after(
datetime.datetime.utcnow() + datetime.timedelta(days=365*10)
) \
.serial_number(random.randrange(1000000000, 2000000000)) \
.add_extension(
x509.SubjectKeyIdentifier.from_public_key(key.public_key()),
critical=False,
).sign(key, hashes.SHA512(), default_backend())
with open(pub_key, "wb") as f:
f.write(cert.public_bytes(serialization.Encoding.PEM))
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