http://sourceforge.net/tracker/index.php?func=detail&aid=1849383&group_id=20937&atid=320937

--- pycrypto-2.0.1/Hash/MD5.py
+++ pycrypto-2.0.1/Hash/MD5.py
@@ -13,11 +13,14 @@
     digest_size = new().digest_size
 
 except ImportError:
-    from md5 import *
+    # cannot import 'md5' from within 'MD5.py',
+    # because on case insensitive filesystems it will find myself.
+    # thus need to do the actual 'import md5' from somewhere else.
+    from extmd5 import *
 
-    import md5
-    if hasattr(md5, 'digestsize'):
+    import extmd5
+    if hasattr(extmd5, 'digestsize'):
         digest_size = digestsize
         del digestsize
-    del md5
+    del extmd5
 
--- pycrypto-2.0.1/Hash/SHA.py
+++ pycrypto-2.0.1/Hash/SHA.py
@@ -13,9 +13,12 @@
     digest_size = new().digest_size
 
 except ImportError:
-    from sha import *
-    import sha
-    if hasattr(sha, 'digestsize'):
+    # cannot import 'sha' from within 'SHA.py',
+    # because on case insensitive filesystems it will find myself.
+    # thus need to do the actual 'import sha' from somewhere else.
+    from extsha import *
+    import extsha
+    if hasattr(extsha, 'digestsize'):
         digest_size = digestsize
         del digestsize
-    del sha
+    del extsha
--- pycrypto-2.0.1/Hash/extmd5/__init__.py
+++ pycrypto-2.0.1/Hash/extmd5/__init__.py
@@ -0,0 +1,2 @@
+# see ../MD5.py for why this is done
+from md5 import *
--- pycrypto-2.0.1/Hash/extsha/__init__.py
+++ pycrypto-2.0.1/Hash/extsha/__init__.py
@@ -0,0 +1,2 @@
+# see ../SHA.py for why this is done
+from sha import *
--- pycrypto-2.0.1/setup.py
+++ pycrypto-2.0.1/setup.py
@@ -132,7 +132,7 @@
       'url':"http://www.amk.ca/python/code/crypto",
 
       'cmdclass' : {'build_ext':PCTBuildExt},
-      'packages' : ["Crypto", "Crypto.Hash", "Crypto.Cipher", "Crypto.Util",
+      'packages' : ["Crypto", "Crypto.Hash", "Crypto.Hash.extmd5", "Crypto.Hash.extsha", "Crypto.Cipher", "Crypto.Util",
                   "Crypto.Protocol", "Crypto.PublicKey"],
       'package_dir' : { "Crypto":"." },
       # One module is defined here, because build_ext won't be