From dd32fceb5429a650a30de1a352356f87737be856 Mon Sep 17 00:00:00 2001
From: iceman1001 <iceman@iuse.se>
Date: Sat, 14 Sep 2024 18:38:28 +0200
Subject: [PATCH] support function

---
 client/src/util.c | 7 +++++++
 client/src/util.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/client/src/util.c b/client/src/util.c
index fa3df7d79..904846e94 100644
--- a/client/src/util.c
+++ b/client/src/util.c
@@ -1153,6 +1153,13 @@ void hex_xor(uint8_t *d, const uint8_t *x, int n) {
     }
 }
 
+void hex_xor_token(uint8_t *d, const uint8_t *x, int dn, int xn) {
+    while (dn--) {
+        d[dn] ^= x[dn % xn];
+    }
+}
+
+
 // return parity bit required to match type
 uint8_t GetParity(const uint8_t *bits, uint8_t type, int length) {
     int x;
diff --git a/client/src/util.h b/client/src/util.h
index 1606cb81c..d4c34eb46 100644
--- a/client/src/util.h
+++ b/client/src/util.h
@@ -142,6 +142,7 @@ void bytes_2_binstr(char *target,  const uint8_t *source, size_t sourcelen);
 void binstr_2_bytes(uint8_t *target, size_t *targetlen, const char *src);
 
 void hex_xor(uint8_t *d, const uint8_t *x, int n);
+void hex_xor_token(uint8_t *d, const uint8_t *x, int dn, int xn);
 
 uint8_t GetParity(const uint8_t *bits, uint8_t type, int length);
 void wiegand_add_parity(uint8_t *target, const uint8_t *source, uint8_t length);