--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/symbian-qemu-0.9.1-12/python-2.6.1/Demo/pdist/security.py	Fri Jul 31 15:01:17 2009 +0100
@@ -0,0 +1,33 @@
+class Security:
+
+    def __init__(self):
+        import os
+        env = os.environ
+        if env.has_key('PYTHON_KEYFILE'):
+            keyfile = env['PYTHON_KEYFILE']
+        else:
+            keyfile = '.python_keyfile'
+            if env.has_key('HOME'):
+                keyfile = os.path.join(env['HOME'], keyfile)
+            if not os.path.exists(keyfile):
+                import sys
+                for dir in sys.path:
+                    kf = os.path.join(dir, keyfile)
+                    if os.path.exists(kf):
+                        keyfile = kf
+                        break
+        try:
+            self._key = eval(open(keyfile).readline())
+        except IOError:
+            raise IOError, "python keyfile %s: cannot open" % keyfile
+
+    def _generate_challenge(self):
+        import random
+        return random.randint(100, 100000)
+
+    def _compare_challenge_response(self, challenge, response):
+        return self._encode_challenge(challenge) == response
+
+    def _encode_challenge(self, challenge):
+        p, m = self._key
+        return pow(long(challenge), p, m)