serialize EC public keys

2 files changed, 40 insertions, 2 deletions

diff --git a/src/cryptography/hazmat/backends/openssl/ec.py b/src/cryptography/hazmat/backends/openssl/ec.py
index 19d646e8..39b0a555 100644
--- a/src/cryptography/hazmat/backends/openssl/ec.py
+++ b/src/cryptography/hazmat/backends/openssl/ec.py
@@ -9,7 +9,7 @@ from cryptography.exceptions import (
     InvalidSignature, UnsupportedAlgorithm, _Reasons
 )
 from cryptography.hazmat.backends.openssl.utils import _truncate_digest
-from cryptography.hazmat.primitives import hashes
+from cryptography.hazmat.primitives import hashes, serialization
 from cryptography.hazmat.primitives.asymmetric import (
     AsymmetricSignatureContext, AsymmetricVerificationContext, ec
 )
@@ -262,3 +262,24 @@ class _EllipticCurvePublicKey(object):
             y=y,
             curve=self._curve
         )
+
+    def public_bytes(self, encoding, format):
+        if format is serialization.PublicFormat.PKCS1:
+            raise ValueError(
+                "EC public keys do not support PKCS1 serialization"
+            )
+
+        evp_pkey = self._backend._lib.EVP_PKEY_new()
+        assert evp_pkey != self._backend._ffi.NULL
+        evp_pkey = self._backend._ffi.gc(
+            evp_pkey, self._backend._lib.EVP_PKEY_free
+        )
+        res = self._backend._lib.EVP_PKEY_set1_EC_KEY(evp_pkey, self._ec_key)
+        assert res == 1
+        return self._backend._public_key_bytes(
+            encoding,
+            format,
+            None,
+            evp_pkey,
+            None
+        )
diff --git a/src/cryptography/hazmat/primitives/asymmetric/ec.py b/src/cryptography/hazmat/primitives/asymmetric/ec.py
index 52e14816..bf1705db 100644
--- a/src/cryptography/hazmat/primitives/asymmetric/ec.py
+++ b/src/cryptography/hazmat/primitives/asymmetric/ec.py
@@ -98,13 +98,30 @@ class EllipticCurvePublicKey(object):
 
 
 @six.add_metaclass(abc.ABCMeta)
-class EllipticCurvePublicKeyWithNumbers(EllipticCurvePublicKey):
+class EllipticCurvePublicKeyWithSerialization(EllipticCurvePublicKey):
     @abc.abstractmethod
     def public_numbers(self):
         """
         Returns an EllipticCurvePublicNumbers.
         """
 
+    @abc.abstractmethod
+    def public_bytes(self, encoding, format):
+        """
+        Returns the key serialized as bytes.
+        """
+
+
+EllipticCurvePublicKeyWithNumbers = utils.deprecated(
+    EllipticCurvePublicKeyWithSerialization,
+    __name__,
+    (
+        "The EllipticCurvePublicKeyWithNumbers interface has been renamed to "
+        "EllipticCurvePublicKeyWithSerialization"
+    ),
+    utils.DeprecatedIn08
+)
+
 
 @utils.register_interface(EllipticCurve)
 class SECT571R1(object):