1 files changed, 12 insertions, 0 deletions
diff --git a/cryptography/primitives/block/ciphers.py b/cryptography/primitives/block/ciphers.py
index cf54aa35..f204dbe9 100644
--- a/cryptography/primitives/block/ciphers.py
+++ b/cryptography/primitives/block/ciphers.py
@@ -32,3 +32,15 @@ class AES(object):
     @property
     def key_size(self):
         return len(self.key) * 8
+
+
+class TripleDES(object):
+    name = "3DES"
+    block_size = 64
+    # TODO: is there a better way to represent the fact that the effective key
+    # size is 56 bits?
+    key_sizes = set([64, 128, 192])
+
+    def __init__(self, key):
+        super(TripleDES, self).__init__()
+        self.key = key