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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import absolute_import, division, print_function
import datetime
from cryptography import utils, x509
from cryptography.hazmat.primitives import hashes
@utils.register_interface(x509.Certificate)
class _Certificate(object):
def __init__(self, backend, x509):
self._backend = backend
self._x509 = x509
def fingerprint(self, algorithm):
h = hashes.Hash(algorithm, self._backend)
bio = self._backend._create_mem_bio()
res = self._backend._lib.i2d_X509_bio(
bio, self._x509
)
assert res == 1
der = self._backend._read_mem_bio(bio)
h.update(der)
return h.finalize()
@property
def version(self):
version = self._backend._lib.X509_get_version(self._x509)
if version == 0:
return x509.Version.v1
elif version == 2:
return x509.Version.v3
else:
raise x509.InvalidVersion(
"{0} is not a valid X509 version".format(version), version
)
@property
def serial(self):
asn1_int = self._backend._lib.X509_get_serialNumber(self._x509)
assert asn1_int != self._backend._ffi.NULL
bn = self._backend._lib.ASN1_INTEGER_to_BN(
asn1_int, self._backend._ffi.NULL
)
assert bn != self._backend._ffi.NULL
bn = self._backend._ffi.gc(bn, self._backend._lib.BN_free)
return self._backend._bn_to_int(bn)
def public_key(self):
pkey = self._backend._lib.X509_get_pubkey(self._x509)
assert pkey != self._backend._ffi.NULL
pkey = self._backend._ffi.gc(pkey, self._backend._lib.EVP_PKEY_free)
return self._backend._evp_pkey_to_public_key(pkey)
@property
def not_valid_before(self):
asn1_time = self._backend._lib.X509_get_notBefore(self._x509)
return self._parse_asn1_time(asn1_time)
@property
def not_valid_after(self):
asn1_time = self._backend._lib.X509_get_notAfter(self._x509)
return self._parse_asn1_time(asn1_time)
def _parse_asn1_time(self, asn1_time):
assert asn1_time != self._backend._ffi.NULL
generalized_time = self._backend._lib.ASN1_TIME_to_generalizedtime(
asn1_time, self._backend._ffi.NULL
)
assert generalized_time != self._backend._ffi.NULL
generalized_time = self._backend._ffi.gc(
generalized_time, self._backend._lib.ASN1_GENERALIZEDTIME_free
)
time = self._backend._ffi.string(
self._backend._lib.ASN1_STRING_data(
self._backend._ffi.cast("ASN1_STRING *", generalized_time)
)
).decode("ascii")
return datetime.datetime.strptime(time, "%Y%m%d%H%M%SZ")
@property
def issuer(self):
issuer = self._backend._lib.X509_get_issuer_name(self._x509)
assert issuer != self._backend._ffi.NULL
return self._build_x509_name(issuer)
@property
def subject(self):
subject = self._backend._lib.X509_get_subject_name(self._x509)
assert subject != self._backend._ffi.NULL
return self._build_x509_name(subject)
def _build_x509_name(self, x509_name):
count = self._backend._lib.X509_NAME_entry_count(x509_name)
attributes = []
for x in range(count):
entry = self._backend._lib.X509_NAME_get_entry(x509_name, x)
obj = self._backend._lib.X509_NAME_ENTRY_get_object(entry)
assert obj != self._backend._ffi.NULL
data = self._backend._lib.X509_NAME_ENTRY_get_data(entry)
assert data != self._backend._ffi.NULL
buf = self._backend._ffi.new("unsigned char **")
res = self._backend._lib.ASN1_STRING_to_UTF8(buf, data)
assert res >= 0
assert buf[0] != self._backend._ffi.NULL
buf = self._backend._ffi.gc(
buf, lambda buf: self._backend._lib.OPENSSL_free(buf[0])
)
value = self._backend._ffi.buffer(buf[0], res)[:].decode('utf8')
# Set to 80 on the recommendation of
# https://www.openssl.org/docs/crypto/OBJ_nid2ln.html
buf_len = 80
buf = self._backend._ffi.new("char[]", buf_len)
res = self._backend._lib.OBJ_obj2txt(buf, buf_len, obj, 1)
assert res > 0
oid = self._backend._ffi.buffer(buf, res)[:].decode()
attributes.append(
x509.NameAttribute(
x509.ObjectIdentifier(oid), value
)
)
return x509.Name(attributes)
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