Port to Python 3.

src/allmydata/crypto/__init__.py

@@ -5,4 +5,15 @@ For the most part, these functions use and return objects that are
 documented in the `cryptography` library -- however, code inside Tahoe
 should only use these functions and not rely on features of any
 objects that `cryptography` documents.
+
+Ported to Python 3.
 """
+
+from __future__ import unicode_literals
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+from future.utils import PY2
+if PY2:
+    from builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, int, list, object, range, str, max, min  # noqa: F401

src/allmydata/crypto/aes.py

@@ -6,7 +6,17 @@ These functions use and return objects that are documented in the
 `cryptography` library -- however, code inside Tahoe should only use
 functions from allmydata.crypto.aes and not rely on features of any
 objects that `cryptography` documents.
+
+Ported to Python 3.
 """
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+from future.utils import PY2
+if PY2:
+    from builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, int, list, object, range, str, max, min  # noqa: F401
 
 import six
 

src/allmydata/crypto/ed25519.py

@@ -13,7 +13,18 @@ cut-and-pasteability. The base62 encoding is shorter than the base32 form,
 but the minor usability improvement is not worth the documentation and
 specification confusion of using a non-standard encoding. So we stick with
 base32.
+
+Ported to Python 3.
 '''
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+
+from future.utils import PY2
+if PY2:
+    from builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, int, list, object, range, str, max, min  # noqa: F401
 
 import six
 

src/allmydata/crypto/error.py

@@ -1,6 +1,16 @@
 """
 Exceptions raise by allmydata.crypto.* modules
+
+Ported to Python 3.
 """
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+from future.utils import PY2
+if PY2:
+    from builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, int, list, object, range, str, max, min  # noqa: F401
 
 
 class BadSignature(Exception):

src/allmydata/crypto/rsa.py

@@ -9,8 +9,17 @@ features of any objects that `cryptography` documents.
 
 That is, the public and private keys are opaque objects; DO NOT depend
 on any of their methods.
-"""
 
+Ported to Python 3.
+"""
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+from future.utils import PY2
+if PY2:
+    from builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, int, list, object, range, str, max, min  # noqa: F401
 
 from cryptography.exceptions import InvalidSignature
 from cryptography.hazmat.backends import default_backend

src/allmydata/crypto/util.py

@@ -1,6 +1,16 @@
 """
 Utilities used by allmydata.crypto modules
+
+Ported to Python 3.
 """
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+from future.utils import PY2
+if PY2:
+    from builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, int, list, object, range, str, max, min  # noqa: F401
 
 from allmydata.crypto.error import BadPrefixError
 

src/allmydata/util/_python3.py

@@ -15,6 +15,12 @@ if PY2:
 
 # Keep these sorted alphabetically, to reduce merge conflicts:
 PORTED_MODULES = [
+    "allmydata.crypto",
+    "allmydata.crypto.aes",
+    "allmydata.crypto.ed25519",
+    "allmydata.crypto.error",
+    "allmydata.crypto.rsa",
+    "allmydata.crypto.util",
     "allmydata.hashtree",
     "allmydata.util.abbreviate",
     "allmydata.util.assertutil",