Adds certificate encoding to PEM and DER.

2 files changed, 16 insertions, 0 deletions

diff --git a/src/cryptography/hazmat/backends/openssl/x509.py b/src/cryptography/hazmat/backends/openssl/x509.py
index 72041366..c7d2d154 100644
--- a/src/cryptography/hazmat/backends/openssl/x509.py
+++ b/src/cryptography/hazmat/backends/openssl/x509.py
@@ -311,6 +311,18 @@ class _Certificate(object):
 
         return x509.Extensions(extensions)
 
+    def public_bytes(self, encoding):
+        if not isinstance(encoding, serialization.Encoding):
+            raise TypeError("encoding must be an item from the Encoding enum")
+
+        bio = self._backend._create_mem_bio()
+        if encoding is serialization.Encoding.PEM:
+            res = self._backend._lib.PEM_write_bio_X509(bio, self._x509)
+        elif encoding is serialization.Encoding.DER:
+            res = self._backend._lib.i2d_X509_bio(bio, self._x509)
+        assert res == 1
+        return self._backend._read_mem_bio(bio)
+
 
 def _decode_certificate_policies(backend, ext):
     cp = backend._ffi.cast(
diff --git a/src/cryptography/x509.py b/src/cryptography/x509.py
index 9a3295ce..a786c705 100644
--- a/src/cryptography/x509.py
+++ b/src/cryptography/x509.py
@@ -1167,6 +1167,10 @@ class Certificate(object):
         Checks not equal.
         """
 
+    @abc.abstractmethod
+    def public_bytes(self, encoding):
+        pass
+
 
 @six.add_metaclass(abc.ABCMeta)
 class CertificateSigningRequest(object):