diff --git a/qaglobalutils.cpp b/qaglobalutils.cpp
new file mode 100644
index 0000000..d8f3c8d
--- /dev/null
+++ b/qaglobalutils.cpp
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2018-2021 QuasarApp.
+ * Distributed under the lgplv3 software license, see the accompanying
+ * Everyone is permitted to copy and distribute verbatim copies
+ * of this license document, but changing it is not allowed.
+*/
+
+#include "qaglobalutils.h"
+
+template<class NUM>
+void gen(int size, QByteArray &result) {
+    for (; size >= 0; size -= sizeof(NUM)) {
+        NUM random = (rand() * rand()) % std::numeric_limits<NUM>::max();
+        result.insert(0, reinterpret_cast<char*>(&random), sizeof(random));
+    }
+}
+
+void randomArray(int size, QByteArray &result) {
+    if (size % sizeof(unsigned long long) == 0) {
+        gen<unsigned long long>(size, result);
+    } else if (size % sizeof(unsigned int) == 0) {
+        gen<unsigned int>(size, result);
+    } else if (size % sizeof(unsigned short) == 0) {
+        gen<unsigned short>(size, result);
+    } else {
+        gen<unsigned char>(size, result);
+    }
+}
diff --git a/qaglobalutils.h b/qaglobalutils.h
index 07955e5..bde9eb1 100644
--- a/qaglobalutils.h
+++ b/qaglobalutils.h
@@ -12,6 +12,7 @@
 #include <type_traits>
 #include <string>
 #include <typeinfo>
+#include <QByteArray>
 #include "QtGlobal"
 
 
@@ -182,4 +183,11 @@ uint8_t static_type_hash_8(T& object) noexcept {
     #define debug_assert(condition, msg) assert(condition && msg)
 #endif
 
+/**
+ * @brief randomArray This function return random arrat with size @a size
+ * @param size This is size of needed array.
+ * @param result This is result value of generated array.
+*/
+void randomArray(int size, QByteArray &result);
+
 #endif // GLOBAL_H