Remove Blowfish, DES, DES3, IDEA, RC5, and XOR modules

Because:

    - Blowfish: Uses the original (ambiguous) PyCrypto license.  The
      documentation says "the Blowfish algorithm has been placed in the public
      domain and can be used freely", but this seems to be referring to
      patents, not copyright.

    - DES: The file says "Copyright (C) 1993 Eric Young", and appears to have
      been taken from SSLeay.  The license of SSLeay is not GPL-compatible,
      since it has an advertising clause.

    - DES3: Same reason as for the DES module.

    - IDEA: Patent-encumbered.

    - RC5: Patent-encumbered.

    - XOR: Insecure as a stream cipher, and it silently truncates "keys"
      to 32 bytes.  The strxor module is a better replacement if you want to
      do a bitwise exclusive-or between strings.

1 files changed, 9 insertions, 19 deletions

diff --git a/setup.py b/setup.py
index 335987d..9e20d2d 100644
--- a/setup.py
+++ b/setup.py
@@ -99,33 +99,23 @@ class PCTBuildExt (build_ext):
             Extension("Crypto.Cipher.ARC2",
                       include_dirs=['src/'],
                       sources=["src/ARC2.c"]),
-            Extension("Crypto.Cipher.Blowfish",
-                      include_dirs=['src/'],
-                      sources=["src/Blowfish.c"]),
+#            Extension("Crypto.Cipher.Blowfish",
+#                      include_dirs=['src/'],
+#                      sources=["src/Blowfish.c"]),
             Extension("Crypto.Cipher.CAST",
                       include_dirs=['src/'],
                       sources=["src/CAST.c"]),
-            Extension("Crypto.Cipher.DES",
-                      include_dirs=['src/'],
-                      sources=["src/DES.c"]),
-            Extension("Crypto.Cipher.DES3",
-                      include_dirs=['src/'],
-                      sources=["src/DES3.c"]),
-            Extension("Crypto.Cipher.IDEA",
-                      include_dirs=['src/'],
-                      sources=["src/IDEA.c"],
-                      libraries=HTONS_LIBS),
-            Extension("Crypto.Cipher.RC5",
-                      include_dirs=['src/'],
-                      sources=["src/RC5.c"]),
+#            Extension("Crypto.Cipher.DES",
+#                      include_dirs=['src/'],
+#                      sources=["src/DES.c"]),
+#            Extension("Crypto.Cipher.DES3",
+#                      include_dirs=['src/'],
+#                      sources=["src/DES3.c"]),
 
             # Stream ciphers
             Extension("Crypto.Cipher.ARC4",
                       include_dirs=['src/'],
                       sources=["src/ARC4.c"]),
-            Extension("Crypto.Cipher.XOR",
-                      include_dirs=['src/'],
-                      sources=["src/XOR.c"]),
 
             # Utility modules
             Extension("Crypto.Util.strxor",