>From 1fbdaac800e4e9113a268de03324fe285b27c1fd Mon Sep 17 00:00:00 2001
From: Frank Dittrich <frank_dittrich@hotmail.com>
Date: Fri, 20 Jul 2012 19:07:50 +0200
Subject: [PATCH 2/2] Add [List.External:Filter_Rot13]

---
 run/john.conf |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/run/john.conf b/run/john.conf
index d9e51c7..dbc93ec 100644
--- a/run/john.conf
+++ b/run/john.conf
@@ -1543,6 +1543,29 @@ void filter()
 	word[i] = map2[(o & 0xfff) + (e >> 12)];
 }
 
+# Trivial Rot13 Example
+[List.External:Filter_Rot13]
+void filter()
+{
+	int i, j, c;
+
+	j = 0;
+	i = 0;				// Convert to uppercase
+
+	while (c = word[i]) {
+		if ((c >= 'a' && c <= 'm') || c >= 'A' && c <= 'M' ) {
+			word[i] = c + 13;
+			j++;
+		} else if ((c >= 'n' && c <= 'z') || c >= 'N' && c <= 'Z' ) {
+			word[i] = c - 13;
+			j++;
+		}
+		i++;
+	}
+	if (j == 0)
+		word = 0;
+}
+
 # Trivial parallel processing example
 [List.External_base:Parallel]
 /*
-- 
1.7.7.6