5 files changed, 34 insertions, 37 deletions
diff --git a/src/cryptography/hazmat/backends/openssl/rsa.py b/src/cryptography/hazmat/backends/openssl/rsa.py
index 1357889f..efc1a577 100644
--- a/src/cryptography/hazmat/backends/openssl/rsa.py
+++ b/src/cryptography/hazmat/backends/openssl/rsa.py
@@ -22,8 +22,8 @@ from cryptography.hazmat.primitives.asymmetric.rsa import (
     RSAPublicKeyWithNumbers
 )
 from cryptography.hazmat.primitives.serialization import (
-    BestAvailable, Encoding, KeySerializationEncryption, NoEncryption, PKCS8,
-    TraditionalOpenSSL
+    BestAvailableEncryption, Encoding, Format, KeySerializationEncryption,
+    NoEncryption
 )
 
 
@@ -565,18 +565,23 @@ class _RSAPrivateKey(object):
             )
         )
 
-    def dump(self, serializer, encryption_algorithm):
-        if isinstance(serializer, PKCS8):
+    def dump(self, encoding, fmt, encryption_algorithm):
+        if not isinstance(encoding, Encoding):
+            raise TypeError("encoding must be an item from the Encoding enum")
+
+        if not isinstance(fmt, Format):
+            raise TypeError("format must be an item from the Format enum")
+
+        # This is a temporary check until we land DER serialization.
+        if encoding != Encoding.PEM:
+            raise ValueError("Only PEM encoding is supported by this backend")
+
+        if fmt == Format.PKCS8:
             write_bio = self._backend._lib.PEM_write_bio_PKCS8PrivateKey
             key = self._evp_pkey
-        elif isinstance(serializer, TraditionalOpenSSL):
+        elif fmt == Format.TraditionalOpenSSL:
             write_bio = self._backend._lib.PEM_write_bio_RSAPrivateKey
             key = self._rsa_cdata
-        else:
-            raise TypeError("serializer must be PKCS8 or TraditionalOpenSSL")
-
-        if serializer.encoding != Encoding.PEM:
-            raise ValueError("Only PEM encoding is supported by this backend")
 
         if not isinstance(encryption_algorithm, KeySerializationEncryption):
             raise TypeError(
@@ -588,7 +593,7 @@ class _RSAPrivateKey(object):
             password = b""
             passlen = 0
             evp_cipher = self._backend._ffi.NULL
-        elif isinstance(encryption_algorithm, BestAvailable):
+        elif isinstance(encryption_algorithm, BestAvailableEncryption):
             # This is a curated value that we will update over time.
             evp_cipher = self._backend._lib.EVP_get_cipherbyname(
                 b"aes-256-cbc"
diff --git a/src/cryptography/hazmat/primitives/asymmetric/rsa.py b/src/cryptography/hazmat/primitives/asymmetric/rsa.py
index e994a9cc..918717f3 100644
--- a/src/cryptography/hazmat/primitives/asymmetric/rsa.py
+++ b/src/cryptography/hazmat/primitives/asymmetric/rsa.py
@@ -50,14 +50,21 @@ class RSAPrivateKeyWithSerialization(RSAPrivateKey):
         """
 
     @abc.abstractmethod
-    def dump(self, serializer, encryption_algorithm):
+    def dump(self, encoding, fmt, encryption_algorithm):
         """
-        Returns the PEM encoded key.
+        Returns the dumped key.
         """
 
 
-# DeprecatedIn08
-RSAPrivateKeyWithNumbers = RSAPrivateKeyWithSerialization
+RSAPrivateKeyWithNumbers = utils.deprecated(
+    RSAPrivateKeyWithSerialization,
+    __name__,
+    (
+        "The RSAPrivateKeyWithNumbers interface has been renamed to "
+        "RSAPrivateKeyWithSerialization"
+    ),
+    utils.DeprecatedIn08
+)
 
 
 @six.add_metaclass(abc.ABCMeta)
diff --git a/src/cryptography/hazmat/primitives/interfaces/__init__.py b/src/cryptography/hazmat/primitives/interfaces/__init__.py
index 6b4241bd..f9ffae06 100644
--- a/src/cryptography/hazmat/primitives/interfaces/__init__.py
+++ b/src/cryptography/hazmat/primitives/interfaces/__init__.py
@@ -289,11 +289,12 @@ RSAPrivateKey = utils.deprecated(
 )
 
 RSAPrivateKeyWithNumbers = utils.deprecated(
-    rsa.RSAPrivateKeyWithNumbers,
+    rsa.RSAPrivateKeyWithSerialization,
     __name__,
     (
         "The RSAPrivateKeyWithNumbers interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.rsa module"
+        "cryptography.hazmat.primitives.asymmetric.rsa module and has been "
+        "renamed RSAPrivateKeyWithSerialization"
     ),
     utils.DeprecatedIn08
 )
diff --git a/src/cryptography/hazmat/primitives/serialization.py b/src/cryptography/hazmat/primitives/serialization.py
index 9bfbc6b7..0d564221 100644
--- a/src/cryptography/hazmat/primitives/serialization.py
+++ b/src/cryptography/hazmat/primitives/serialization.py
@@ -174,24 +174,9 @@ class Encoding(Enum):
     DER = "DER"
 
 
-class PKCS8(object):
-    def __init__(self, encoding):
-        if not isinstance(encoding, Encoding):
-            raise TypeError(
-                "Encoding must be an element from the Encoding enum"
-            )
-
-        self.encoding = encoding
-
-
-class TraditionalOpenSSL(object):
-    def __init__(self, encoding):
-        if not isinstance(encoding, Encoding):
-            raise TypeError(
-                "Encoding must be an element from the Encoding enum"
-            )
-
-        self.encoding = encoding
+class Format(Enum):
+    PKCS8 = "PKCS8"
+    TraditionalOpenSSL = "TraditionalOpenSSL"
 
 
 @six.add_metaclass(abc.ABCMeta)
@@ -200,7 +185,7 @@ class KeySerializationEncryption(object):
 
 
 @utils.register_interface(KeySerializationEncryption)
-class BestAvailable(object):
+class BestAvailableEncryption(object):
     def __init__(self, password):
         if not isinstance(password, bytes) or len(password) == 0:
             raise ValueError("Password must be 1 or more bytes.")
diff --git a/src/cryptography/utils.py b/src/cryptography/utils.py
index 77b6d253..78dcc1ca 100644
--- a/src/cryptography/utils.py
+++ b/src/cryptography/utils.py
@@ -12,7 +12,6 @@ import warnings
 
 # DeprecatedIn07 objects exist. This comment exists to remind developers to
 # look for them when it's time for the ninth release cycle deprecation dance.
-# DeprecatedIn08 objects also exist.
 
 DeprecatedIn08 = PendingDeprecationWarning