From 5fcb031a681403d0a1d23b7f089a1e45cfc298c3 Mon Sep 17 00:00:00 2001
From: iceman1001 <iceman@iuse.se>
Date: Tue, 26 May 2020 13:10:33 +0200
Subject: [PATCH] chg, python scripts can not have "exit" calls...

---
 client/pyscripts/xorcheck.py | 51 ++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100755 client/pyscripts/xorcheck.py

diff --git a/client/pyscripts/xorcheck.py b/client/pyscripts/xorcheck.py
new file mode 100755
index 000000000..f4605a5e7
--- /dev/null
+++ b/client/pyscripts/xorcheck.py
@@ -0,0 +1,51 @@
+#  xorcheck.py - find xor values for 8-bit LRC
+#
+#  Adam Laurie <adam@algroup.co.uk>
+#  http://rfidiot.org/
+#
+#  This code is copyright (c) Adam Laurie, 2009, All rights reserved.
+#  For non-commercial use only, the following terms apply - for all other
+#  uses, please contact the author:
+#
+#    This code is free software; you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation; either version 2 of the License, or
+#    (at your option) any later version.
+#
+#    This code 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 General Public License for more details.
+#
+# 2020, Modified (@iceman1001)
+
+import sys
+
+def main():
+    if(len(sys.argv) < 3):
+        print("""
+    \t{0} - Generate final byte for XOR LRC
+
+    Usage: {0} <ID Byte1> <ID Byte2> ... <LRC>
+
+    \tSpecifying the bytes of a UID with a known LRC will find the last byte value
+    \tneeded to generate that LRC with a rolling XOR. All bytes should be specified in HEX.
+
+    Example:
+
+    \t{0} 04 00 80 64 ba
+
+    Should produce the output:
+
+    \tTarget (BA) requires final LRC XOR byte value: 5A\n""".format(sys.argv[0]))
+        return 0
+
+    target= int(sys.argv[len(sys.argv) - 1],16)
+
+    lrc= 0x00
+    for i in range(len(sys.argv) - 1):
+        lrc ^= int(sys.argv[i + 1],16)
+    print('\nTarget (%02X) requires final LRC XOR byte value: %02X\n' % (target,lrc))
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file