diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index f8c7eef..705c09c 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -6,6 +6,8 @@
 
 .. note:: This version is not yet released and is under active development.
 
+* Added :class:`~cryptography.hazmat.primitives.kdf.x963kdf.X963KDF`.
+
 1.0.1 - 2015-09-05
 ~~~~~~~~~~~~~~~~~~
 
diff --git a/docs/hazmat/primitives/key-derivation-functions.rst b/docs/hazmat/primitives/key-derivation-functions.rst
index 10b806e..4d95629 100644
--- a/docs/hazmat/primitives/key-derivation-functions.rst
+++ b/docs/hazmat/primitives/key-derivation-functions.rst
@@ -519,7 +519,7 @@
     SECG in `SEC 1 v2.0`_ recommends that
     :class:`~cryptography.hazmat.primitives.kdf.concatkdf.ConcatKDFHash` be
     used for new projects. This KDF should only be used for backwards
-    compatibility with pre-existing implementations.
+    compatibility with pre-existing protocols.
 
 
     .. warning::
diff --git a/tests/hazmat/primitives/test_X963_vectors.py b/tests/hazmat/primitives/test_X963_vectors.py
index 14bcff4..0332e60 100644
--- a/tests/hazmat/primitives/test_X963_vectors.py
+++ b/tests/hazmat/primitives/test_X963_vectors.py
@@ -57,9 +57,9 @@
 
         key = binascii.unhexlify(vector["Z"])
         sharedinfo = None
-        if vector["SharedInfo length"] != 0:
-            sharedinfo = binascii.unhexlify(vector["SharedInfo"])
-        key_data_len = vector["key data length"] // 8
+        if vector["sharedinfo_length"] != 0:
+            sharedinfo = binascii.unhexlify(vector["sharedinfo"])
+        key_data_len = vector["key_data_length"] // 8
         key_data = binascii.unhexlify(vector["key_data"])
 
         xkdf = X963KDF(algorithm=hashfn(),
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 023f57c..04182a0 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -3466,24 +3466,24 @@
 
     assert load_x963_vectors(vector_data) == [
         {"hash": "SHA-1", "count": 0,
-         "shared secret length": 192,
+         "shared_secret_length": 192,
          "Z": "1c7d7b5f0597b03d06a018466ed1a93e30ed4b04dc64ccdd",
-         "SharedInfo length": 0,
-         "key data length": 128,
+         "sharedinfo_length": 0,
+         "key_data_length": 128,
          "key_data": "bf71dffd8f4d99223936beb46fee8ccc"},
         {"hash": "SHA-1", "count": 1,
-         "shared secret length": 192,
+         "shared_secret_length": 192,
          "Z": "5ed096510e3fcf782ceea98e9737993e2b21370f6cda2ab1",
-         "SharedInfo length": 0,
-         "key data length": 128,
+         "sharedinfo_length": 0,
+         "key_data_length": 128,
          "key_data": "ec3e224446bfd7b3be1df404104af953"},
         {"hash": "SHA-512", "count": 0,
-         "shared secret length": 521,
+         "shared_secret_length": 521,
          "Z": "00aa5bb79b33e389fa58ceadc047197f14e73712f452caa9fc4c9adb369348b\
 81507392f1a86ddfdb7c4ff8231c4bd0f44e44a1b55b1404747a9e2e753f55ef05a2d",
-         "SharedInfo length": 128,
-         "SharedInfo": "e3b5b4c1b0d5cf1d2b3a2f9937895d31",
-         "key data length": 1024,
+         "sharedinfo_length": 128,
+         "sharedinfo": "e3b5b4c1b0d5cf1d2b3a2f9937895d31",
+         "key_data_length": 1024,
          "key_data": "4463f869f3cc18769b52264b0112b5858f7ad32a5a2d96d8cffabf7f\
 a733633d6e4dd2a599acceb3ea54a6217ce0b50eef4f6b40a5c30250a5a8eeee208002267089db\
 f351f3f5022aa9638bf1ee419dea9c4ff745a25ac27bda33ca08bd56dd1a59b4106cf2dbbc0ab2\
diff --git a/tests/utils.py b/tests/utils.py
index c0052c9..cc3f9fc 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -671,7 +671,7 @@
     result_rx = re.compile(r"([FP]) \(([0-9]+) -")
 
     tags = []
-    sets = dict()
+    sets = {}
     vectors = []
 
     # find info in header
@@ -709,8 +709,8 @@
 
     # Data
     data = {
-        "CAVS": dict(),
-        "IUT": dict(),
+        "CAVS": {},
+        "IUT": {},
     }
     tag = None
     for line in vector_data:
@@ -756,8 +756,8 @@
             vectors.append(data)
 
             data = {
-                "CAVS": dict(),
-                "IUT": dict(),
+                "CAVS": {},
+                "IUT": {},
             }
 
     return vectors
@@ -772,7 +772,7 @@
 
     # Sets Metadata
     hashname = None
-    vector = dict()
+    vector = {}
     for line in vector_data:
         line = line.strip()
 
@@ -791,21 +791,21 @@
             count = int(line.split("=")[1].strip())
             vector["hash"] = hashname
             vector["count"] = count
-            vector["shared secret length"] = shared_secret_len
-            vector["SharedInfo length"] = shared_info_len
-            vector["key data length"] = key_data_len
+            vector["shared_secret_length"] = shared_secret_len
+            vector["sharedinfo_length"] = shared_info_len
+            vector["key_data_length"] = key_data_len
         elif line.startswith("Z"):
             vector["Z"] = line.split("=")[1].strip()
             assert math.ceil(shared_secret_len / 8) * 2 == len(vector["Z"])
         elif line.startswith("SharedInfo"):
             if shared_info_len != 0:
-                vector["SharedInfo"] = line.split("=")[1].strip()
-                silen = len(vector["SharedInfo"])
+                vector["sharedinfo"] = line.split("=")[1].strip()
+                silen = len(vector["sharedinfo"])
                 assert math.ceil(shared_info_len / 8) * 2 == silen
         elif line.startswith("key_data"):
             vector["key_data"] = line.split("=")[1].strip()
             assert math.ceil(key_data_len / 8) * 2 == len(vector["key_data"])
             vectors.append(vector)
-            vector = dict()
+            vector = {}
 
     return vectors