diff --git a/utils/bytes.go b/utils/bytes.go
new file mode 100644
index 0000000..45c7817
--- /dev/null
+++ b/utils/bytes.go
@@ -0,0 +1,7 @@
+package utils
+
+import "bytes"
+
+func ConcatBytes(slices ...[]byte) []byte {
+	return bytes.Join(slices, nil)
+}
diff --git a/utils/endian.go b/utils/endian.go
new file mode 100644
index 0000000..d18fb3f
--- /dev/null
+++ b/utils/endian.go
@@ -0,0 +1,13 @@
+package utils
+
+import "encoding/binary"
+
+func EncodeEndian(value uint32, length int) []byte {
+	byteSlice := make([]byte, length)
+	binary.LittleEndian.PutUint32(byteSlice, value)
+	return byteSlice
+}
+
+func DecodeEndian(byteSlice []byte) uint32 {
+	return binary.LittleEndian.Uint32(byteSlice)
+}