minor header addition for spa-entropy.pl

diff --git a/extras/spa-entropy/spa-entropy.pl b/extras/spa-entropy/spa-entropy.pl
index c36ee1b..69247f4 100755 (executable)
--- a/extras/spa-entropy/spa-entropy.pl
+++ b/extras/spa-entropy/spa-entropy.pl
@@ -1,7 +1,15 @@
 #!/usr/bin/perl -w
 #
+# File: spa-entropy.pl
+#
+# Purpose: To measure cross-packet SPA entropy on a byte by byte slice basis
+#          and produce gunplot graphs.  This is useful to measure SPA packet
+#          randomness after encryption.
+#
 # Author: Michael Rash <mbr@cipherdyne.org>
 #
+# License: GPL v2
+#
 
 use MIME::Base64;
 use IPC::Open2;