add support for equality testing to x509.Certificate

3 files changed, 23 insertions, 0 deletions

diff --git a/src/cryptography/hazmat/backends/openssl/x509.py b/src/cryptography/hazmat/backends/openssl/x509.py
index 5558f140..7f633c76 100644
--- a/src/cryptography/hazmat/backends/openssl/x509.py
+++ b/src/cryptography/hazmat/backends/openssl/x509.py
@@ -123,6 +123,16 @@ class _Certificate(object):
         self._backend = backend
         self._x509 = x509
 
+    def __eq__(self, other):
+        if not isinstance(other, x509.Certificate):
+            return NotImplemented
+
+        res = self._backend._lib.X509_cmp(self._x509, other._x509)
+        return res == 0
+
+    def __ne__(self, other):
+        return not self == other
+
     def fingerprint(self, algorithm):
         h = hashes.Hash(algorithm, self._backend)
         bio = self._backend._create_mem_bio()
diff --git a/src/cryptography/hazmat/bindings/openssl/x509.py b/src/cryptography/hazmat/bindings/openssl/x509.py
index b5c9ee14..59da6f75 100644
--- a/src/cryptography/hazmat/bindings/openssl/x509.py
+++ b/src/cryptography/hazmat/bindings/openssl/x509.py
@@ -115,6 +115,7 @@ FUNCTIONS = """
 X509 *X509_new(void);
 void X509_free(X509 *);
 X509 *X509_dup(X509 *);
+int X509_cmp(const X509 *, const X509 *);
 
 int X509_print_ex(BIO *, X509 *, unsigned long, unsigned long);
 
diff --git a/src/cryptography/x509.py b/src/cryptography/x509.py
index dd6ea926..b22ac8be 100644
--- a/src/cryptography/x509.py
+++ b/src/cryptography/x509.py
@@ -730,6 +730,18 @@ class Certificate(object):
         in the certificate.
         """
 
+    @abc.abstractmethod
+    def __eq__(self, other):
+        """
+        Checks equality.
+        """
+
+    @abc.abstractmethod
+    def __ne__(self, other):
+        """
+        Checks not equal.
+        """
+
 
 @six.add_metaclass(abc.ABCMeta)
 class CertificateSigningRequest(object):