diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index c4370ba..2825211 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -17,19 +17,22 @@ jobs:
     - name: install clang
       run: sudo apt install clang
 
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
+
+    - name: get updated submodules
+      run: git submodule update --init --recursive
     
     - name: build and compile the static library.
-      run: make -f staticlib CC=clang++
+      run: make -f staticlib CXX=clang++
 
     - name: run the tests for the static library.
-      run: make -f staticlib static_test CC=clang++
+      run: make -f staticlib static_test CXX=clang++
 
     - name: clean test executables
       run: make clean
 
     - name: install the static library.
-      run: sudo make -f staticlib install CC=clang++
+      run: sudo make -f staticlib install CXX=clang++
 
     - name: compile the static sample program for the library.
       run: clang++ static-build.cpp -o static-build.out -lchacha20 -fsanitize=address
@@ -48,7 +51,10 @@ jobs:
     runs-on: ubuntu-latest
     
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
+
+    - name: get updated submodules
+      run: git submodule update --init --recursive
     
     - name: build and compile the static library.
       run: make -f staticlib
diff --git a/.github/workflows/clang.yml b/.github/workflows/clang.yml
index 12c792c..9e656d6 100644
--- a/.github/workflows/clang.yml
+++ b/.github/workflows/clang.yml
@@ -16,7 +16,10 @@ jobs:
     - name: install clang
       run: sudo apt install clang
 
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
+
+    - name: get updated submodules
+      run: git submodule update --init --recursive
 
     - name: compile and run tests in header mode
-      run: make header_test CC=clang++
\ No newline at end of file
+      run: make header_test CXX=clang++
\ No newline at end of file
diff --git a/.github/workflows/gcc-gnu.yml b/.github/workflows/gcc-gnu.yml
index e042012..da98fb0 100644
--- a/.github/workflows/gcc-gnu.yml
+++ b/.github/workflows/gcc-gnu.yml
@@ -12,6 +12,10 @@ jobs:
     runs-on: ubuntu-latest
     
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
+
+    - name: get updated submodules
+      run: git submodule update --init --recursive
+      
     - name: compile and run tests in header mode
       run: make header_test
\ No newline at end of file
diff --git a/.github/workflows/mingw64.yml b/.github/workflows/mingw64.yml
index adc8315..9b094d5 100644
--- a/.github/workflows/mingw64.yml
+++ b/.github/workflows/mingw64.yml
@@ -12,8 +12,13 @@ jobs:
     runs-on: windows-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
+
+    - name: get updated submodules
+      run: git submodule update --init --recursive
+    
     - name: compiler architecture
       run: gcc -dumpmachine
+
     - name: compile and run tests in header mode
       run: make header_test
diff --git a/.github/workflows/msvc.yml b/.github/workflows/msvc.yml
index 3fd8863..7af0434 100644
--- a/.github/workflows/msvc.yml
+++ b/.github/workflows/msvc.yml
@@ -23,6 +23,9 @@ jobs:
     
     steps:
     - uses: actions/checkout@v3
+
+    - name: get updated submodules
+      run: git submodule update --init --recursive
     
     - name: Configure test executables
       run: cmake -S tests -B tests ${{matrix.platform.flags}}
diff --git a/ChaCha20-Poly1305.cpp b/ChaCha20-Poly1305.cpp
index eb49cb4..f03dd65 100644
--- a/ChaCha20-Poly1305.cpp
+++ b/ChaCha20-Poly1305.cpp
@@ -1,9 +1,10 @@
 #ifndef CHACHA20_CPP_mrdcvlsc
 #define CHACHA20_CPP_mrdcvlsc
-#include "extended-precision-integers/include/epi/epi.hpp"
 #include <cstring>
 #include <iostream>
 
+#include "extended-precision-integers/include/epi/epi.hpp"
+
 #ifdef _MAKE_LIB
 #include "ChaCha20-Poly1305.hpp"
 #endif
diff --git a/aarch64test b/aarch64test
index 24dc047..ab79393 100644
--- a/aarch64test
+++ b/aarch64test
@@ -1,12 +1,12 @@
-CC := g++
-TESTFLAGS := -g -Og -D_HIDE_WARNING
-CXXFLAGS := -std=c++11 -Wall -Wextra
+CXX:=g++
+TESTFLAGS:=-g -Og -D_HIDE_WARNING
+CXXFLAGS:=-std=c++20 -Wall -Wextra
 
-OS := $(shell uname)
+OS:=$(shell uname)
 
-SRC := tests
-SRC_FILES := $(wildcard $(SRC)/*.cpp)
-OBJ := $(patsubst $(SRC)/%.cpp,$(SRC)/%.out,$(SRC_FILES))
+SRC:=tests
+SRC_FILES:=$(wildcard $(SRC)/*.cpp)
+OBJ:=$(patsubst $(SRC)/%.cpp,$(SRC)/%.out,$(SRC_FILES))
 
 # -------------------------- run test programs ---------------------------
 
@@ -17,14 +17,6 @@ header_test: $(OBJ)
 	@./$(SRC)/QuarterRound_test.out
 	@./$(SRC)/BlockFunction_test.out
 	@./$(SRC)/Encryption_test.out
-	@./$(SRC)/constructor.out
-	@./$(SRC)/comparison.out
-	@./$(SRC)/leftshifts.out
-	@./$(SRC)/rightshifts.out
-	@./$(SRC)/addition.out
-	@./$(SRC)/subtraction.out
-	@./$(SRC)/multiplication.out
-	@./$(SRC)/division.out
 	@./$(SRC)/poly1305_mac_test.out
 	@./$(SRC)/poly1305_keygen.out
 	@./$(SRC)/chacha20_aead_enc_dec.out
@@ -58,8 +50,8 @@ header_test: $(OBJ)
 # -------------------------- test program compilation ---------------------------
 
 $(SRC)/%.out: $(SRC)/%.cpp
-	@echo "compiling test program - compiler : $(CC)"
-	@$(CC) $(TESTFLAGS) $(CXXFLAGS) -o $@ $<
+	@echo "compiling test program - compiler : $(CXX)"
+	@$(CXX) $(TESTFLAGS) $(CXXFLAGS) -o $@ $<
 
 clean:
 ifeq ($(OS), Linux)
diff --git a/makefile b/makefile
index a39b075..41ffe10 100644
--- a/makefile
+++ b/makefile
@@ -1,16 +1,16 @@
-CC := g++
-TESTFLAGS := -g -Og -D_HIDE_WARNING
-CXXFLAGS := -std=c++20 -Wall -Wextra
+CXX:=g++
+TESTFLAGS:=-g -Og -D_HIDE_WARNING
+CXXFLAGS:=-std=c++20 -Wall -Wextra
 
-OS := $(shell uname)
+OS:=$(shell uname)
 
 ifeq ($(OS), Linux)
-TESTFLAGS += -fsanitize=address
+TESTFLAGS+=-fsanitize=address
 endif
 
-SRC := tests
-SRC_FILES := $(wildcard $(SRC)/*.cpp)
-OBJ := $(patsubst $(SRC)/%.cpp,$(SRC)/%.out,$(SRC_FILES))
+SRC:=tests
+SRC_FILES:=$(wildcard $(SRC)/*.cpp)
+OBJ:=$(patsubst $(SRC)/%.cpp,$(SRC)/%.out,$(SRC_FILES))
 
 # -------------------------- run test programs ---------------------------
 
@@ -21,14 +21,6 @@ header_test: $(OBJ)
 	@./$(SRC)/QuarterRound_test.out
 	@./$(SRC)/BlockFunction_test.out
 	@./$(SRC)/Encryption_test.out
-	@./$(SRC)/constructor.out
-	@./$(SRC)/comparison.out
-	@./$(SRC)/leftshifts.out
-	@./$(SRC)/rightshifts.out
-	@./$(SRC)/addition.out
-	@./$(SRC)/subtraction.out
-	@./$(SRC)/multiplication.out
-	@./$(SRC)/division.out
 	@./$(SRC)/poly1305_mac_test.out
 	@./$(SRC)/poly1305_keygen.out
 	@./$(SRC)/chacha20_aead_enc_dec.out
@@ -62,9 +54,9 @@ header_test: $(OBJ)
 # -------------------------- test program compilation ---------------------------
 
 $(SRC)/%.out: $(SRC)/%.cpp
-# @echo "compiling test program - compiler : $(CC)"
+# @echo "compiling test program - compiler : $(CXX)"
 # @echo "flags: $<"
-	$(CC) $(TESTFLAGS) $(CXXFLAGS) -o $@ $<
+	$(CXX) $(TESTFLAGS) $(CXXFLAGS) -o $@ $<
 
 clean:
 ifeq ($(OS), Linux)
diff --git a/readme.md b/readme.md
index a9dc00e..2382b87 100644
--- a/readme.md
+++ b/readme.md
@@ -3,7 +3,7 @@
 ![build](https://github.com/mrdcvlsc/ChaCha20-Poly1305/actions/workflows/build.yml/badge.svg)
 [![License: MIT](https://img.shields.io/badge/License-MIT-green.svg)](https://opensource.org/licenses/MIT)
 
-A from scratch C++ (with slight inline assembly) implementation of ```ChaCha20 & Poly1305``` stream cipher described in [RFC - 8439](https://www.rfc-editor.org/info/rfc8439).
+A from scratch C++ implementation of ```ChaCha20 & Poly1305``` stream cipher described in [RFC - 8439](https://www.rfc-editor.org/info/rfc8439).
 
 **tests:**
 
diff --git a/staticlib b/staticlib
index 061df84..20803e4 100644
--- a/staticlib
+++ b/staticlib
@@ -1,27 +1,27 @@
-CC := g++
+CXX:=g++
 INSTALL_PREFIX=/usr/local/
 
 HEADER_OUT:=build/include
 LIB_OUT:=build/lib
 LIB_OUTNAME:=libchacha20.a
 
-CXXFLAGS := -std=c++11 -Wall -Wextra
-USERFLAGS := -D_MAKE_LIB -D_HIDE_WARNING
-TEST_OPTIMIZATION := -g -Og
-HEADER_PATHS := -I./$(HEADER_OUT)
-LIB_OPTIMIZATION := -O2
-LIB_PATHS := -L./$(LIB_OUT)
-LIBS := -lchacha20
+CXXFLAGS:=-std=c++11 -Wall -Wextra
+USERFLAGS:=-D_MAKE_LIB -D_HIDE_WARNING
+TEST_OPTIMIZATION:=-g -Og
+HEADER_PATHS:=-I./$(HEADER_OUT)
+LIB_OPTIMIZATION:=-O2
+LIB_PATHS:=-L./$(LIB_OUT)
+LIBS:=-lchacha20
 
-OS := $(shell uname)
+OS:=$(shell uname)
 
 ifeq ($(OS), Linux)
-TEST_OPTIMIZATION += -fsanitize=address
+TEST_OPTIMIZATION+=-fsanitize=address
 endif
 
-SRC := tests
-SRC_FILES := $(wildcard $(SRC)/*.cpp)
-OBJ := $(patsubst $(SRC)/%.cpp,$(SRC)/%.out,$(SRC_FILES))
+SRC:=tests
+SRC_FILES:=$(wildcard $(SRC)/*.cpp)
+OBJ:=$(patsubst $(SRC)/%.cpp,$(SRC)/%.out,$(SRC_FILES))
 
 default:
 ifeq ($(OS), Linux)
@@ -30,12 +30,10 @@ ifeq ($(OS), Linux)
 	@mkdir $(HEADER_OUT)
 	@mkdir $(LIB_OUT)
 	@echo "creating static lib"
-	@echo "compiling uint320..."
-	@$(CC) -c uint320.cpp $(LIB_OPTIMIZATION) $(USERFLAGS)
 	@echo "compiling ChaCha20..."
-	@$(CC) -c ChaCha20-Poly1305.cpp $(LIB_OPTIMIZATION) $(USERFLAGS)
+	@$(CXX) -c ChaCha20-Poly1305.cpp $(LIB_OPTIMIZATION) $(USERFLAGS)
 	@echo "compiling $(LIB_OUTNAME)..."
-	@ar -r $(LIB_OUTNAME) uint320.o ChaCha20-Poly1305.o
+	@ar -r $(LIB_OUTNAME) ChaCha20-Poly1305.o
 	@echo "build done : output -> $(LIB_OUTNAME)"
 	@echo "moving files to build folder"
 	@mv $(dir $(abspath $(lastword $(MAKEFILE_LIST))))$(LIB_OUTNAME) ./$(LIB_OUT)/
@@ -46,12 +44,10 @@ else
 	@mkdir "$(HEADER_OUT)"
 	@mkdir "$(LIB_OUT)"
 	@echo "creating static lib"
-	@echo "compiling uint320..."
-	@$(CC) -c uint320.cpp $(LIB_OPTIMIZATION) $(USERFLAGS)
 	@echo "compiling ChaCha20..."
-	@$(CC) -c ChaCha20-Poly1305.cpp $(LIB_OPTIMIZATION) $(USERFLAGS)
+	@$(CXX) -c ChaCha20-Poly1305.cpp $(LIB_OPTIMIZATION) $(USERFLAGS)
 	@echo "compiling $(LIB_OUTNAME)..."
-	@ar -r $(LIB_OUTNAME) uint320.o ChaCha20.o
+	@ar -r $(LIB_OUTNAME) ChaCha20.o
 	@echo "build done : output -> $(LIB_OUTNAME)"
 	@echo "moving files to build folder"
 	@move "./$(LIB_OUTNAME)" "$(LIB_OUT)"
@@ -74,14 +70,14 @@ ifeq ($(OS), Linux)
 	@echo ""
 	@echo "running build test"
 	@cp static-build.cpp  build
-	@$(CC) build/static-build.cpp -o build/static-build.out -I./$(HEADER_OUT)/ -L./$(LIB_OUT) $(LIBS)
+	@$(CXX) build/static-build.cpp -o build/static-build.out -I./$(HEADER_OUT)/ -L./$(LIB_OUT) $(LIBS)
 	@./build/static-build.out
 else
 	@echo "==============================="
 	@echo ""
 	@echo "running build test"
 	@copy static-build.cpp  build
-	@$(CC) build/static-build.cpp -o build/static-build.exe -I./$(HEADER_OUT)/ -L./$(LIB_OUT) $(LIBS)
+	@$(CXX) build/static-build.cpp -o build/static-build.exe -I./$(HEADER_OUT)/ -L./$(LIB_OUT) $(LIBS)
 	@build/static-build.exe
 endif
 
@@ -93,14 +89,6 @@ static_test: $(OBJ)
 	@./$(SRC)/QuarterRound_test.out
 	@./$(SRC)/BlockFunction_test.out
 	@./$(SRC)/Encryption_test.out
-	@./$(SRC)/constructor.out
-	@./$(SRC)/comparison.out
-	@./$(SRC)/leftshifts.out
-	@./$(SRC)/rightshifts.out
-	@./$(SRC)/addition.out
-	@./$(SRC)/subtraction.out
-	@./$(SRC)/multiplication.out
-	@./$(SRC)/division.out
 	@./$(SRC)/poly1305_mac_test.out
 	@./$(SRC)/poly1305_keygen.out
 	@./$(SRC)/chacha20_aead_enc_dec.out
@@ -134,8 +122,8 @@ static_test: $(OBJ)
 # -------------------------- test program compilation ---------------------------
 
 $(SRC)/%.out: $(SRC)/%.cpp
-	@echo "compiling test program (static build) - compiler : $(CC)"
-	@$(CC) $(CXXFLAGS) $(USERFLAGS) $(HEADER_PATHS) -o $@ $< $(LIB_PATHS) $(LIBS) $(TEST_OPTIMIZATION)
+	@echo "compiling test program (static build) - compiler : $(CXX)"
+	@$(CXX) $(CXXFLAGS) $(USERFLAGS) $(HEADER_PATHS) -o $@ $< $(LIB_PATHS) $(LIBS) $(TEST_OPTIMIZATION)
 
 install:
 ifeq ($(OS), Linux)