1 files changed, 28 insertions, 5 deletions
diff --git a/cryptography/hazmat/primitives/ciphers/algorithms.py b/cryptography/hazmat/primitives/ciphers/algorithms.py
index 8046bd26..75a87265 100644
--- a/cryptography/hazmat/primitives/ciphers/algorithms.py
+++ b/cryptography/hazmat/primitives/ciphers/algorithms.py
@@ -13,14 +13,17 @@
 
 from __future__ import absolute_import, division, print_function
 
+from cryptography import utils
+from cryptography.hazmat.primitives import interfaces
 
+
+@utils.register_interface(interfaces.CipherAlgorithm)
 class AES(object):
     name = "AES"
     block_size = 128
     key_sizes = frozenset([128, 192, 256])
 
     def __init__(self, key):
-        super(AES, self).__init__()
         self.key = key
 
         # Verify that the key size matches the expected key size
@@ -34,13 +37,13 @@ class AES(object):
         return len(self.key) * 8
 
 
+@utils.register_interface(interfaces.CipherAlgorithm)
 class Camellia(object):
     name = "camellia"
     block_size = 128
     key_sizes = frozenset([128, 192, 256])
 
     def __init__(self, key):
-        super(Camellia, self).__init__()
         self.key = key
 
         # Verify that the key size matches the expected key size
@@ -54,13 +57,13 @@ class Camellia(object):
         return len(self.key) * 8
 
 
+@utils.register_interface(interfaces.CipherAlgorithm)
 class TripleDES(object):
     name = "3DES"
     block_size = 64
     key_sizes = frozenset([64, 128, 192])
 
     def __init__(self, key):
-        super(TripleDES, self).__init__()
         if len(key) == 8:
             key += key + key
         elif len(key) == 16:
@@ -78,13 +81,13 @@ class TripleDES(object):
         return len(self.key) * 8
 
 
+@utils.register_interface(interfaces.CipherAlgorithm)
 class Blowfish(object):
     name = "Blowfish"
     block_size = 64
     key_sizes = frozenset(range(32, 449, 8))
 
     def __init__(self, key):
-        super(Blowfish, self).__init__()
         self.key = key
 
         # Verify that the key size matches the expected key size
@@ -98,13 +101,33 @@ class Blowfish(object):
         return len(self.key) * 8
 
 
+@utils.register_interface(interfaces.CipherAlgorithm)
 class CAST5(object):
     name = "CAST5"
     block_size = 64
     key_sizes = frozenset([40, 48, 56, 64, 72, 80, 88, 96, 104, 112, 120, 128])
 
     def __init__(self, key):
-        super(CAST5, self).__init__()
+        self.key = key
+
+        # Verify that the key size matches the expected key size
+        if self.key_size not in self.key_sizes:
+            raise ValueError("Invalid key size ({0}) for {1}".format(
+                self.key_size, self.name
+            ))
+
+    @property
+    def key_size(self):
+        return len(self.key) * 8
+
+
+@utils.register_interface(interfaces.CipherAlgorithm)
+class ARC4(object):
+    name = "RC4"
+    block_size = 1
+    key_sizes = frozenset([40, 56, 64, 80, 128, 192, 256])
+
+    def __init__(self, key):
         self.key = key
 
         # Verify that the key size matches the expected key size