support for ntlm proxy

wakatime/packages/ntlm_auth/rc4.py

@@ -0,0 +1,51 @@
+# This library is free software: you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation, either
+# version 3 of the License, or (at your option) any later version.
+
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library.  If not, see <http://www.gnu.org/licenses/> or <http://www.gnu.org/licenses/lgpl.txt>.
+
+class ARC4(object):
+    state = None
+    i = 0
+    j = 0
+
+    def __init__(self, key):
+        # Split up the key into a list
+        if isinstance(key, str):
+            key = [ord(c) for c in key]
+        else:
+            key = [c for c in key]
+
+        #Key-scheduling algorithm (KSA)
+        self.state = [n for n in range(256)]
+        j = 0
+        for i in range(256):
+            j = (j + self.state[i] + key[i % len(key)]) % 256
+            self.state[i], self.state[j] = self.state[j], self.state[i]
+
+    def update(self, value):
+        chars = []
+        random_gen = self._random_generator()
+        for char in value:
+            if isinstance(value, str):
+                byte = ord(char)
+            else:
+                byte = char
+            updated_byte = byte ^ next(random_gen)
+            chars.append(updated_byte)
+        return bytes(bytearray(chars))
+
+    def _random_generator(self):
+        #Pseudo-Random Generation Algorithm (PRGA)
+        while True:
+            self.i = (self.i + 1) % 256
+            self.j = (self.j + self.state[self.i]) % 256
+            self.state[self.i], self.state[self.j] = self.state[self.j], self.state[self.i]
+            yield self.state[(self.state[self.i] + self.state[self.j]) % 256]