Python:检索 <ObjectIdentifier> 的属性

Question

我正在使用加密技术加载新证书并检索其属性。

from cryptography import x509
from cryptography.hazmat.backends import default_backend
path = "mycert.crt"
with open(path, 'rb') as cert_file:
    data = cert_file.read()
cert = x509.load_pem_x509_certificate(data, default_backend())
sign = cert.signature_algorithm_oid
iss = cert.issuer

最后两个打印结果为:

print sign
<ObjectIdentifier(oid=1.1.1.1.1.1.11, name=sha256WithRSAEncryption)>

print iss
<Name([<NameAttribute(oid=<ObjectIdentifier(oid=1.1.1.1, name=countryName)>, value=u'GR')>, <NameAttribute(oid=<ObjectIdentifier(oid=1.1.1.1, name=organizationName)>, value=u'MyTrust')>, <NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.3, name=commonName)>, value=u'MyTrust')>])>

如何正确访问这些属性之一？ 例如，我只想打印 sha256WithRSAEncryption 和 C=GR, O=MyTrust, CN=MyTrust

在 Danielle 回复后，我正在更新问题。

>>> dir(iss)   
>>> ['__class__', '__delattr__', '__dict__', '__doc__', '__eq__', '__format__', '__getattribute__', '__hash__', '__init__', '__iter__', '__len__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_attributes', 'get_attributes_for_oid', 'public_bytes', 'rdns']

当我打印一份时，它仍然很难访问:

>>> print(iss.__dict__)  
>>> {'_attributes': [<RelativeDistinguishedName([<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.6, name=countryName)>, value=u'GR')>])>, <RelativeDistinguishedName([<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.10, name=organizationName)>, value=u'MyTrust')>])>, <RelativeDistinguishedName([<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.11, name=organizationalUnitName)>, value=u'MyTrust')>])>, <RelativeDistinguishedName([<NameAttribute(oid=<ObjectIdentifier(oid=2.5.4.3, name=commonName)>, value=u'MyTrust')>])>]}

如何获取所有值？ 国家的名字 机构名称 组织单位名称 通用名 等等

Answer 1

如果您想检查一个对象并找到它的属性，请尝试使用 dir() 函数:

>>> dir(sign)
>>> ['__class__', '__delattr__', '__dict__', '__doc__', '__eq__', '__format__', '__getattribute__', '__hash__', '__init__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_dotted_string', '_name', 'dotted_string']

也许_name？

>>> print(sign._name)
>>> sha1WithRSAEncryption

https://docs.python.org/2/library/functions.html#dir