2 files changed, 3 insertions, 1 deletions
diff --git a/src/shared/Auth/AuthCrypt.cpp b/src/shared/Auth/AuthCrypt.cpp
index 199e7192537..7941b33ed8c 100644
--- a/src/shared/Auth/AuthCrypt.cpp
+++ b/src/shared/Auth/AuthCrypt.cpp
@@ -50,8 +50,9 @@ void AuthCrypt::DecryptRecv(uint8 *data, size_t len)
 void AuthCrypt::EncryptSend(uint8 *data, size_t len)
 {
     if (!_initialized) return;
+    if (len < CRYPTED_SEND_LEN) return;
 
-    for (size_t t = 0; t < len; t++)
+    for (size_t t = 0; t < CRYPTED_SEND_LEN; t++)
     {
         _send_i %= _key.size();
         uint8 x = (data[t] ^ _key[_send_i]) + _send_j;
diff --git a/src/shared/Auth/AuthCrypt.h b/src/shared/Auth/AuthCrypt.h
index 366cce5635f..f3a0cac40fa 100644
--- a/src/shared/Auth/AuthCrypt.h
+++ b/src/shared/Auth/AuthCrypt.h
@@ -32,6 +32,7 @@ class AuthCrypt
         AuthCrypt();
         ~AuthCrypt();
 
+        const static size_t CRYPTED_SEND_LEN = 4;
         const static size_t CRYPTED_RECV_LEN = 6;
 
         void Init();