From f211c1cbab92ff5d5b0992384fbc76711473fe31 Mon Sep 17 00:00:00 2001
From: Mari Wahl <mari.wahl9@gmail.com>
Date: Sat, 3 Jan 2015 19:37:32 -0500
Subject: [PATCH] checksum

---
 .../MD5/brute_force_hex_digest_chars.py       |  5 +++++
 Cryptography/MD5/checksum_file.py             | 21 +++++++++++++++++++
 Network_and_802.11/socket/crack_linksys.py    |  2 +-
 3 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 Cryptography/MD5/checksum_file.py

diff --git a/Cryptography/MD5/brute_force_hex_digest_chars.py b/Cryptography/MD5/brute_force_hex_digest_chars.py
index 46a4ff3..f077bf1 100644
--- a/Cryptography/MD5/brute_force_hex_digest_chars.py
+++ b/Cryptography/MD5/brute_force_hex_digest_chars.py
@@ -1,3 +1,8 @@
+#!/usr/bin/env python
+
+__author__ = "bt3"
+
+
 '''
 EXAMPLE FROM ASIS 2013, WITH THE CONCATENATED HASH:
 
diff --git a/Cryptography/MD5/checksum_file.py b/Cryptography/MD5/checksum_file.py
new file mode 100644
index 0000000..0b9bad0
--- /dev/null
+++ b/Cryptography/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()
\ No newline at end of file
diff --git a/Network_and_802.11/socket/crack_linksys.py b/Network_and_802.11/socket/crack_linksys.py
index 7bf919b..fefca45 100755
--- a/Network_and_802.11/socket/crack_linksys.py
+++ b/Network_and_802.11/socket/crack_linksys.py
@@ -1,4 +1,4 @@
-sisu#!/usr/bin/env python
+#!/usr/bin/env python
 
 __author__ = "bt3"