crypto modules

Cryptography/Hash_Functions/MD5/checksum_file.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+
+__author__ = "bt3"
+
+'''
+Calculate the MD5 checksum of a file.
+We work on chunks to avoid using too much memory when the file is large.
+'''
+
+import os
+from Crypto.Hash import MD5
+def get_file_checksum(filename):
+    h = MD5.new()
+    chunk_size = 8192
+    with open(filename, 'rb') as f:
+        while True:
+            chunk = f.read(chunk_size)
+            if len(chunk) == 0:
+                break
+            h.update(chunk)
+    return h.hexdigest()