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Source release 15.0.0

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This commit is contained in:
John W. Bruce
2019-02-28 16:25:30 -08:00
parent f51edaba5a
commit 66628486b5
2672 changed files with 260431 additions and 762489 deletions
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35
oem_certificate_generator/oem_certificate.py
View File

@@ -1,15 +1,15 @@
# Copyright 2017 Google Inc. All Rights Reserved.
# Copyright 2017 Google LLC. All Rights Reserved.
"""OEM certificate generation tool.
Supports:
- Generating CSR (certificate signing request)
- Generating OEM intermediate certificate (for testing)
- Generating OEM intermediate certificate (for testing only)
- Generating OEM leaf certificate chain
- Erasing file securely
- Getting CSR/certificate/certificate chain information
Prerequirements:
Prerequirements (if running the script directly):
- Install pip: https://pip.pypa.io/en/stable/installing/
- Install python cryptography: https://cryptography.io/en/latest/installation/
@@ -124,9 +124,9 @@ class X509CertificateChain(object):
for certificate in self._certificates:
backend._lib.sk_X509_push(x509_stack, certificate._x509)
pkcs7_partial = 0x4000
p7 = backend._lib.PKCS7_sign(backend._ffi.NULL, backend._ffi.NULL,
x509_stack, backend._ffi.NULL, pkcs7_partial)
x509_stack, backend._ffi.NULL,
backend._lib.PKCS7_DETACHED)
p7 = backend._ffi.gc(p7, backend._lib.PKCS7_free)
bio = backend._create_mem_bio_gc()
@@ -247,8 +247,14 @@ def generate_intermediate_certificate(args):
def generate_leaf_certificate(args):
"""Subparser handler for generating leaf certificate."""
intermediate_cert_bytes = args.intermediate_certificate_file.read()
intermediate_cert = x509.load_der_x509_certificate(intermediate_cert_bytes,
backends.default_backend())
try:
intermediate_cert = x509.load_pem_x509_certificate(
intermediate_cert_bytes, backends.default_backend())
except ValueError:
intermediate_cert = x509.load_der_x509_certificate(
intermediate_cert_bytes, backends.default_backend())
intermediate_private_key = serialization.load_der_private_key(
args.intermediate_private_key_file.read(),
password=args.intermediate_private_key_passphrase,
@@ -334,8 +340,14 @@ def _handle_csr(data):
x509.load_pem_x509_csr(data, backends.default_backend()))
def _handle_certificate(data):
"""Utility function for get_info to parse certificate."""
def _handle_pem_certificate(data):
"""Utility function for get_info to parse pem certificate."""
return _certificate_as_string(
x509.load_pem_x509_certificate(data, backends.default_backend()))
def _handle_der_certificate(data):
"""Utility function for get_info to parse der certificate."""
return _certificate_as_string(
x509.load_der_x509_certificate(data, backends.default_backend()))
@@ -353,7 +365,10 @@ def get_info(args, out=sys.stdout):
# The input is either a CSR or a certificate, or a certificate chain.
# Loop through the corresponding handlers one by one.
data = args.file.read()
for handler in [_handle_csr, _handle_certificate, _handle_certificate_chain]:
for handler in [
_handle_csr, _handle_der_certificate, _handle_pem_certificate,
_handle_certificate_chain
]:
try:
out.write(handler(data))
return

184
oem_certificate_generator/oem_certificate_test.py
View File

@@ -1,5 +1,6 @@
# Copyright 2017 Google Inc. All Rights Reserved.
# Copyright 2017 Google LLC. All Rights Reserved.
import base64
import datetime
import os
import shutil
@@ -15,7 +16,7 @@ from cryptography.hazmat.primitives.asymmetric import padding
from cryptography.x509 import oid
import oem_certificate
import oem_certificate_generator_helper as oem_cert_gen_helper
import oem_certificate_test_helper as oem_cert_test_helper
class ArgParseObject(object):
@@ -32,7 +33,7 @@ class OemCertificateTest(unittest.TestCase):
system_id)
def test_generate_csr(self):
args = oem_cert_gen_helper.setup_csr_args()
args = oem_cert_test_helper.setup_csr_args()
oem_certificate.generate_csr(args)
# Verify CSR.
csr = x509.load_pem_x509_csr(args.output_csr_file.getvalue(),
@@ -67,7 +68,7 @@ class OemCertificateTest(unittest.TestCase):
private_key.public_key().public_numbers())
def test_generate_csr_(self):
args = oem_cert_gen_helper.setup_csr_args(common_name='MyCommonName')
args = oem_cert_test_helper.setup_csr_args(common_name='MyCommonName')
oem_certificate.generate_csr(args)
# Verify CSR.
csr = x509.load_pem_x509_csr(args.output_csr_file.getvalue(),
@@ -103,7 +104,7 @@ class OemCertificateTest(unittest.TestCase):
private_key.public_key().public_numbers())
def test_generate_csr_with_keysize4096_and_passphrase(self):
args = oem_cert_gen_helper.setup_csr_args(
args = oem_cert_test_helper.setup_csr_args(
key_size=4096, passphrase='passphrase_4096')
oem_certificate.generate_csr(args)
private_key = serialization.load_der_private_key(
@@ -119,14 +120,14 @@ class OemCertificateTest(unittest.TestCase):
private_key.public_key().public_numbers())
def test_generate_intermediate_certificate(self):
csr_args = oem_cert_gen_helper.setup_csr_args()
csr_args = oem_cert_test_helper.setup_csr_args()
oem_certificate.generate_csr(csr_args)
csr_bytes = csr_args.output_csr_file.getvalue()
csr = x509.load_pem_x509_csr(csr_bytes, backends.default_backend())
root_key, root_certificate = (
oem_cert_gen_helper.create_root_certificate_and_key())
args = oem_cert_gen_helper.setup_intermediate_cert_args(
oem_cert_test_helper.create_root_certificate_and_key())
args = oem_cert_test_helper.setup_intermediate_cert_args(
csr_bytes, root_key, root_certificate)
oem_certificate.generate_intermediate_certificate(args)
@@ -150,18 +151,20 @@ class OemCertificateTest(unittest.TestCase):
def test_generate_intermediate_with_cert_mismatch_root_cert_and_key(self):
root_key1, _ = (
oem_cert_gen_helper.create_root_certificate_and_key())
_, root_certificate2 = oem_cert_gen_helper.create_root_certificate_and_key()
args = oem_cert_gen_helper.setup_intermediate_cert_args(
oem_cert_test_helper.create_root_certificate_and_key())
_, root_certificate2 = oem_cert_test_helper.create_root_certificate_and_key(
)
args = oem_cert_test_helper.setup_intermediate_cert_args(
'some csr data', root_key1, root_certificate2)
with self.assertRaises(ValueError) as context:
oem_certificate.generate_intermediate_certificate(args)
self.assertTrue('certificate does not match' in str(context.exception))
def test_generate_leaf_certificate(self):
def test_generate_leaf_certificate_from_pem_intermediate_cert(self):
intermediate_key_bytes, intermediate_certificate_bytes = (
oem_cert_gen_helper.create_intermediate_certificate_and_key_bytes())
args = oem_cert_gen_helper.setup_leaf_cert_args(
oem_cert_test_helper.create_intermediate_certificate_and_key_bytes(
pem_format=True))
args = oem_cert_test_helper.setup_leaf_cert_args(
intermediate_key_bytes, intermediate_certificate_bytes)
oem_certificate.generate_leaf_certificate(args)
@@ -173,7 +176,7 @@ class OemCertificateTest(unittest.TestCase):
intermediate_cert = certificates[1]
leaf_cert = certificates[0]
self.assertEqual(
intermediate_cert.public_bytes(serialization.Encoding.DER),
intermediate_cert.public_bytes(serialization.Encoding.PEM),
intermediate_certificate_bytes)
intermediate_cert.public_key().verify(leaf_cert.signature,
leaf_cert.tbs_certificate_bytes,
@@ -199,23 +202,46 @@ class OemCertificateTest(unittest.TestCase):
self.assertEqual(leaf_cert.public_key().public_numbers(),
leaf_key.public_key().public_numbers())
def test_generate_leaf_certificate_from_der_intermediate_cert(self):
intermediate_key_bytes, intermediate_certificate_bytes = (
oem_cert_test_helper.create_intermediate_certificate_and_key_bytes(
pem_format=False))
args = oem_cert_test_helper.setup_leaf_cert_args(
intermediate_key_bytes, intermediate_certificate_bytes)
oem_certificate.generate_leaf_certificate(args)
certificate_chain = oem_certificate.X509CertificateChain.load_der(
args.output_certificate_file.getvalue())
certificates = list(certificate_chain)
self.assertEqual(len(certificates), 2)
intermediate_cert = certificates[1]
leaf_cert = certificates[0]
self.assertEqual(
intermediate_cert.public_bytes(serialization.Encoding.DER),
intermediate_certificate_bytes)
intermediate_cert.public_key().verify(leaf_cert.signature,
leaf_cert.tbs_certificate_bytes,
padding.PKCS1v15(),
leaf_cert.signature_hash_algorithm)
def test_generate_leaf_certificate_with_keysize4096_and_passphrase(self):
intermediate_key_bytes, intermediate_certificate_bytes = (
oem_cert_gen_helper.create_intermediate_certificate_and_key_bytes())
args = oem_cert_gen_helper.setup_leaf_cert_args(
oem_cert_test_helper.create_intermediate_certificate_and_key_bytes())
args = oem_cert_test_helper.setup_leaf_cert_args(
intermediate_key_bytes,
intermediate_certificate_bytes,
key_size=4096,
passphrase='leaf passphrase')
oem_certificate.generate_leaf_certificate(args)
serialization.load_der_private_key(
leaf_key = serialization.load_der_private_key(
args.output_private_key_file.getvalue(),
'leaf passphrase',
backend=backends.default_backend())
self.assertEqual(4096, args.key_size)
self.assertEqual(4096, leaf_key.key_size)
def test_get_csr_info(self):
args = oem_cert_gen_helper.setup_csr_args()
args = oem_cert_test_helper.setup_csr_args()
oem_certificate.generate_csr(args)
args.file = StringIO.StringIO(args.output_csr_file.getvalue())
output = StringIO.StringIO()
@@ -230,9 +256,33 @@ class OemCertificateTest(unittest.TestCase):
Key Size: 4096"""
self.assertEqual(output.getvalue(), textwrap.dedent(expected_info))
def test_get_certificate_info(self):
def test_get_pem_certificate_info(self):
_, intermediate_certificate_bytes = (
oem_cert_gen_helper.create_intermediate_certificate_and_key_bytes())
oem_cert_test_helper.create_intermediate_certificate_and_key_bytes(
pem_format=True))
args = ArgParseObject()
args.file = StringIO.StringIO(intermediate_certificate_bytes)
output = StringIO.StringIO()
oem_certificate.get_info(args, output)
expected_info = """\
Certificate Subject Name:
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.6, name=countryName)>, value=u'US')>
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.8, name=stateOrProvinceName)>, value=u'WA')>
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.7, name=localityName)>, value=u'Kirkland')>
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.10, name=organizationName)>, value=u'CompanyXYZ')>
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.11, name=organizationalUnitName)>, value=u'ContentProtection')>
Issuer Name:
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.3, name=commonName)>, value=u'root_cert')>
Key Size: 4096
Widevine System Id: 2001
Not valid before: 2001-08-09 00:00:00
Not valid after: 2001-11-17 00:00:00"""
self.assertEqual(output.getvalue(), textwrap.dedent(expected_info))
def test_get_der_certificate_info(self):
_, intermediate_certificate_bytes = (
oem_cert_test_helper.create_intermediate_certificate_and_key_bytes(
pem_format=False))
args = ArgParseObject()
args.file = StringIO.StringIO(intermediate_certificate_bytes)
output = StringIO.StringIO()
@@ -254,8 +304,8 @@ class OemCertificateTest(unittest.TestCase):
def test_get_certificate_chain_info(self):
intermediate_key_bytes, intermediate_certificate_bytes = (
oem_cert_gen_helper.create_intermediate_certificate_and_key_bytes())
args = oem_cert_gen_helper.setup_leaf_cert_args(
oem_cert_test_helper.create_intermediate_certificate_and_key_bytes())
args = oem_cert_test_helper.setup_leaf_cert_args(
intermediate_key_bytes, intermediate_certificate_bytes)
oem_certificate.generate_leaf_certificate(args)
args.file = StringIO.StringIO(args.output_certificate_file.getvalue())
@@ -294,6 +344,92 @@ class OemCertificateTest(unittest.TestCase):
Not valid after: 2001-11-17 00:00:00"""
self.assertEqual(output.getvalue(), textwrap.dedent(expected_info))
def test_get_certificate_chain_info_fixed_input(self):
# This was generated from args.output_certificate_file in the test above.
data_b64 = (
'MIIJCQYJKoZIhvcNAQcCoIII+jCCCPYCAQExADAPBgkqhkiG9w0BBwGgAgQAoIII2jCC'
'A+wwggHUoAMCAQICEF8YrBKJsoFPrBNHO2LSenUwDQYJKoZIhvcNAQELBQAwXjELMAkG'
'A1UEBhMCVVMxCzAJBgNVBAgMAldBMREwDwYDVQQHDAhLaXJrbGFuZDETMBEGA1UECgwK'
'Q29tcGFueVhZWjEaMBgGA1UECwwRQ29udGVudFByb3RlY3Rpb24wHhcNMDEwODA5MDAw'
'MDAwWhcNMjMwNzA1MDAwMDAwWjByMRIwEAYDVQQDDAkyMDAxLWxlYWYxCzAJBgNVBAYT'
'AlVTMQswCQYDVQQIDAJXQTERMA8GA1UEBwwIS2lya2xhbmQxEzARBgNVBAoMCkNvbXBh'
'bnlYWVoxGjAYBgNVBAsMEUNvbnRlbnRQcm90ZWN0aW9uMIGfMA0GCSqGSIb3DQEBAQUA'
'A4GNADCBiQKBgQCvY7KZbrMNw/ltcDqTlB+Bu3E5Cbv/JV5Adhnwuk9OiPPJhjx+fx4r'
'Jo05hM1HImHZSB7NtSjUP2Z9tbL8Fa3DgtI6nAJdQZRGrMxfY3EKe2FoQFbbJFMMXqw9'
'yNWLjQzBBB7AkQekdXuJHsiZYAoARa2sSbYYLgQhaLLLj5VeVwIDAQABoxYwFDASBgor'
'BgEEAdZ5BAEBBAQCAgfRMA0GCSqGSIb3DQEBCwUAA4ICAQCO0eQY2brYOiRQLKsoCHhI'
'4/Mi3FOM+rfbqQzM+vesrwahDPLE389igMcNkYTX7QFwdeYMnoqtAeyiPGL42ussqY0h'
'xTdEOAdXJ2cz99ce8d9EnLWTWU4k1Bk/DAZRbIEPmEi2yigr/0pL1oU6J+uGWx3vf3Eh'
'2vVwDtU4ptSwOR9pcT3UgIfVnxVB49i94PqeQQv4JAQ3jezEzt91NkvGMAHTR602hWUU'
'nVlIfnzu9KZWVfr4iyh5vCMcT9YIuBzY5EaoCAcfx8hO7xXLRKfQ9MKfzLjbmoCvOp1o'
'kSLATonsY44JO1e6Uf+RfhtPslk7PoyTlkELBwyRJ+wIwJK9VYxvn5Wm72fjXgReNdDR'
'xL1hB9U6ccQKwdof+C1TVAANCYejPjGQNN9PzgpxFPMbmmphQWqU/K0c6NzP6WoGJFoS'
'HJBa2Mlvi41g1GsGHaJCqpI9bXOxuHhQr5jzEh650S1VuhGfzsO1ycfxIxXWqj1SNm/w'
'mIA504LbQ4o400Ym/QXL4pkeI3XNrIDCYm6Zp8lHuOeqsC7JUulg9O4X9BaQfUHWzbxP'
'UOSzkPaSMMZ6XP4f8ziUbi0OoDU9e2EnHqyc/csXqZJFdKqyySBYwMqDJi2U9nIc4fmT'
'rLKRLG3YcPspgo4fuNtiQMPVwYHypr0siAAuoHEo68Fle9lyijCCBOYwggNOoAMCAQIC'
'EF77T7iz1YiiXO156wo7yZYwDQYJKoZIhvcNAQELBQAwFDESMBAGA1UEAwwJcm9vdF9j'
'ZXJ0MB4XDTAxMDgwOTAwMDAwMFoXDTAxMTExNzAwMDAwMFowXjELMAkGA1UEBhMCVVMx'
'CzAJBgNVBAgMAldBMREwDwYDVQQHDAhLaXJrbGFuZDETMBEGA1UECgwKQ29tcGFueVhZ'
'WjEaMBgGA1UECwwRQ29udGVudFByb3RlY3Rpb24wggIiMA0GCSqGSIb3DQEBAQUAA4IC'
'DwAwggIKAoICAQC4rLWKHrw+TLvwZW3iZiDGbqVzXLTy7d78PmuAUfJEWW23hZUhG6vN'
'YzFpaoYgzDjaQ4O5wivdKKsL+oN0/ZY4cK5N8fcPhpY/iHJTC8/AdbC1qEnrBWsE2ptx'
'M1DKeA2a0Kk5sYQn55WyJaTuGjDf2C0AxveQuua7L4rzC+JadP5HczJngQlsqikXexxO'
'hHenvdwvovnPks93sdAz8OFopIpT/pXag8bPL224RpVoN5LGPDT9yZ8fCm2w5w2USQA6'
'Ir4HnCHpgekcY/lPU3CXhMecjXcBZ1k3fOm9j8U4hq9WM6lSSOUYdVpsZ+ZuIhDdhDuP'
'sxnjo5KSIU9gvDp4m8fgKuxfskKXv7CxkWVRM2AuX80eOBiIYK7UZOGasGmR9QeYQOHu'
'Nrak+JuhK1iQEcbOsX6TEYhLX5ihGxNo03V5XoURjiSo3y7g6NQ1stBiiAqIV7f9Iu9t'
'oTDvwsl7pBUKxO8FeW8W68Cp5M+RdUT853X/9DUWlpJvIecS7oe6/MVfyEKPfGUj1cOr'
'WFHTOKzNtbM+d4YEKjpIrD47RwtffJeZGfKfeWcvHq3gL3hR3O9VUVTl/m3rGz8/JYVW'
'9uJcAoR/ZoCzS71/fclzVOmZu/OHpsIYAicdkhUJLjMZgtdjfOR9VCFe9Aop7+yrrjiA'
'9iQZ38FHf33EZRUrUwIDAQABo2owaDAdBgNVHQ4EFgQUxyronsrwZ7qDmZgUz/xqFMnE'
'riswHwYDVR0jBBgwFoAUV1kgQN4+tYWvzhkBQvOuPtOlo0gwEgYDVR0TAQH/BAgwBgEB'
'/wIBADASBgorBgEEAdZ5BAEBBAQCAgfRMA0GCSqGSIb3DQEBCwUAA4IBgQAhXwS6/bTY'
'9ViWOfWGPYiGqpdvJ7B8ta/rdD3OwTgmTMOHTNNUt2YzsUYTTeW+yS5FKc4EC/51FRGT'
'sE658qNi/V5B87o30aA6z2C8YtJJgBBw1T2uHBJVTul9YyXprJTuBO0nHjx+gbGSoiDr'
'WG9SPG80ZwqTnG0EiHJeCiXfRfAWyYMqjMy0lJnQNNTKPeOh/U1iqMKQkGi0v5dHczXQ'
'bAtcnTowJeNn5zmhbAZTsVRds0Rp3QhlTshZRkYIjs38bPaKv87NG1wyhQvXwIwiLj0b'
'mWhkLpp2+Ug2DZhEOuGIYRdfcgR0bUh54FBHM+PttUc49OaNOMTZNFi2KZmYO30vT256'
'OSGis06hC6pggIzGA7tKP4ATSOBA1fe27ef0YD6pD2dAdQnhaXguDo3/eHbpUXXpqLr6'
'nm0mTbNTgcC673L5YA8qpQkAzk9vLg4UaslMbPfeKM8rqduJFcjTyVY3C4jBC0qxf6z6'
'vpWbEO7UpHHdfvWe9DEBODFbyXMxAA==')
args = oem_cert_test_helper.ArgParseObject()
args.file = StringIO.StringIO(base64.b64decode(data_b64))
output = StringIO.StringIO()
oem_certificate.get_info(args, output)
expected_info = """\
Certificate Subject Name:
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.3, name=commonName)>, value=u'2001-leaf')>
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.6, name=countryName)>, value=u'US')>
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.8, name=stateOrProvinceName)>, value=u'WA')>
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.7, name=localityName)>, value=u'Kirkland')>
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.10, name=organizationName)>, value=u'CompanyXYZ')>
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.11, name=organizationalUnitName)>, value=u'ContentProtection')>
Issuer Name:
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.6, name=countryName)>, value=u'US')>
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.8, name=stateOrProvinceName)>, value=u'WA')>
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.7, name=localityName)>, value=u'Kirkland')>
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.10, name=organizationName)>, value=u'CompanyXYZ')>
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.11, name=organizationalUnitName)>, value=u'ContentProtection')>
Key Size: 1024
Widevine System Id: 2001
Not valid before: 2001-08-09 00:00:00
Not valid after: 2023-07-05 00:00:00
Certificate Subject Name:
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.6, name=countryName)>, value=u'US')>
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.8, name=stateOrProvinceName)>, value=u'WA')>
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.7, name=localityName)>, value=u'Kirkland')>
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.10, name=organizationName)>, value=u'CompanyXYZ')>
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.11, name=organizationalUnitName)>, value=u'ContentProtection')>
Issuer Name:
<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.3, name=commonName)>, value=u'root_cert')>
Key Size: 4096
Widevine System Id: 2001
Not valid before: 2001-08-09 00:00:00
Not valid after: 2001-11-17 00:00:00"""
self.assertEqual(output.getvalue(), textwrap.dedent(expected_info))
def test_secure_erase(self):
args = ArgParseObject()
args.file = tempfile.NamedTemporaryFile(delete=False)

18
oem_certificate_generator/oem_certificate_generator_helper.py → oem_certificate_generator/oem_certificate_test_helper.py
View File

@@ -1,6 +1,6 @@
# Copyright 2017 Google Inc. All Rights Reserved.
# Copyright 2017 Google LLC. All Rights Reserved.
"""Common utility functions for OEM certificate generation."""
"""Common test utility functions for OEM certificate generation."""
import datetime
import StringIO
@@ -137,7 +137,8 @@ def setup_leaf_cert_args(intermediate_key_bytes,
def create_intermediate_certificate_and_key_bytes(key_size=4096,
passphrase=None):
passphrase=None,
pem_format=True):
"""Creates an intermediate certificate and key."""
csr_args = setup_csr_args(key_size=key_size, passphrase=passphrase)
oem_certificate.generate_csr(csr_args)
@@ -145,6 +146,13 @@ def create_intermediate_certificate_and_key_bytes(key_size=4096,
root_key, root_certificate = create_root_certificate_and_key()
args = setup_intermediate_cert_args(csr_bytes, root_key, root_certificate)
oem_certificate.generate_intermediate_certificate(args)
return (csr_args.output_private_key_file.getvalue(),
args.output_certificate_file.getvalue())
cert_bytes = args.output_certificate_file.getvalue()
if pem_format:
cert = x509.load_der_x509_certificate(cert_bytes,
backends.default_backend())
cert_bytes = cert.public_bytes(serialization.Encoding.PEM)
return (csr_args.output_private_key_file.getvalue(), cert_bytes)