Optimization

.gitignore

@@ -1,3 +1,5 @@
 /.vscode/
 /demo_sha1
 /test_sha1
+bin/
+build/

CMakeLists.txt

@@ -0,0 +1,66 @@
+cmake_minimum_required(VERSION 3.18)
+project("SHA1_tests")
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_FLAGS "-Wall")
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+set(EXECUTABLE_OUTPUT_PATH ${CMAKE_SOURCE_DIR}/bin)
+
+get_filename_component(PARENT_DIR ../ ABSOLUTE)
+
+
+if(${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
+	add_definitions(-D_WIN32)
+	add_compile_options("/O2")
+else()
+	add_definitions(-D_LINUX)
+   if(${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
+		message(WARNING "Assuming system in Linux")
+	endif()
+	add_compile_options("-O3")
+	add_compile_options("-g")
+endif()
+
+#---------------------------------------------------------------------
+
+add_library(SHA1_lib INTERFACE)
+
+target_include_directories(
+	SHA1_lib
+	INTERFACE
+	"${CMAKE_SOURCE_DIR}"
+)
+
+#---------------------------------------------------------------------
+
+set(TEST test_sha1)
+
+add_executable(
+	"${TEST}" 
+	test_sha1.cpp
+	test_sha1_file.cpp
+)
+
+target_link_libraries(
+	"${TEST}"
+	PRIVATE
+	SHA1_lib
+)
+
+#---------------------------------------------------------------------
+
+# Create a 1GB size file for testing performance
+
+if(${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
+	message("Creating a 1GB file of random data in /tmp directory...")
+	execute_process(COMMAND dd if=/dev/urandom of=/tmp/1G_test_file.txt bs=1G count=1 iflag=fullblock
+		ERROR_VARIABLE error
+		OUTPUT_VARIABLE output
+	)
+
+	add_compile_definitions(TEST_FILE="/tmp/1G_test_file.txt")
+endif()
+
+#---------------------------------------------------------------------

Makefile

@@ -5,10 +5,10 @@ RM    = rm -f
 all: demo_sha1 test_sha1
 
 demo_sha1: demo_sha1.cpp sha1.cpp sha1.hpp
-	$(CXX) $(CXXFLAGS) $(CPPFLAGS) -Wall -Wextra -std=c++11 -o $@ demo_sha1.cpp sha1.cpp
+	$(CXX) $(CXXFLAGS) $(CPPFLAGS) -Wall -Wextra -std=c++11 -g -O3 -o $@ demo_sha1.cpp
 
 test_sha1: test_sha1.cpp test_sha1_file.cpp sha1.hpp
-	$(CXX) $(CXXFLAGS) $(CPPFLAGS) -Wall -Wextra -std=c++11 -o $@ test_sha1.cpp test_sha1_file.cpp sha1.cpp
+	$(CXX) $(CXXFLAGS) $(CPPFLAGS) -Wall -Wextra -std=c++11 -g -O3 -o $@ test_sha1.cpp test_sha1_file.cpp
 
 check: test_sha1
 	./test_sha1

README.md

@@ -0,0 +1,29 @@
+# SHA-1 implementation in C++
+
+## Warning
+
+Do not use SHA-1 unless you have to! 
+[SHA-1 is practically broken](https://en.wikipedia.org/wiki/SHA-1#Birthday-Near-Collision_Attack_%E2%80%93_first_practical_chosen-prefix_attack). Use a hash function from the [SHA-2](https://en.wikipedia.org/wiki/SHA-2) or [SHA-3](https://en.wikipedia.org/wiki/SHA-3) family instead.
+
+## How to build tests
+
+Using cmake
+```
+mkdir build
+cd build
+cmake ..
+make
+```
+
+## License
+
+100% Public Domain
+
+## Authors
+
+- Steve Reid (Original C Code)
+- [Bruce Guenter](http://untroubled.org/) (Small changes to fit into bglibs)
+- [Volker Diels-Grabsch](https://njh.eu/) (Translation to simpler C++ Code)
+- [Eugene Hopkinson](https://riot.so/) (Safety improvements)
+- [Zlatko Michailov](http://zlatko.michailov.org) (Header-only library)
+- [Dan Machado](dan-machado@yandex.com) (Refactoring)

performance.txt

@@ -0,0 +1,8 @@
+perf stat ./../bin/test_sha1
+0.011223803 seconds time elapsed
+
+perf stat ./../bin/test_sha1 --slow
+6.446021922 seconds time elapsed
+
+perf stat ./../bin/test_sha1 /tmp/1G_test_file.txt
+1.885112058 seconds time elapsed