tools v6.0.0

The first unified calibre plugin

DeDRM_calibre_plugin/DeDRM_plugin/pycrypto_des.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python
+# vim:ts=4:sw=4:softtabstop=4:smarttab:expandtab
+
+
+def load_pycrypto():
+    try :
+        from Crypto.Cipher import DES as _DES
+    except:
+        return None
+
+    class DES(object):
+        def __init__(self, key):
+            if len(key) != 8 :
+                raise Error('DES improper key used')
+            self.key = key
+            self._des = _DES.new(key,_DES.MODE_ECB)
+        def desdecrypt(self, data):
+            return self._des.decrypt(data)
+        def decrypt(self, data):
+            if not data:
+                return ''
+            i = 0
+            result = []
+            while i < len(data):
+                block = data[i:i+8]
+                processed_block = self.desdecrypt(block)
+                result.append(processed_block)
+                i += 8
+            return ''.join(result)
+    return DES