diff --git a/.vscode/extensions.json b/.vscode/extensions.json
new file mode 100644
index 0000000..5a9a397
--- /dev/null
+++ b/.vscode/extensions.json
@@ -0,0 +1,5 @@
+{
+    "recommendations": [
+        "ms-vscode.cpptools"
+    ]
+}
\ No newline at end of file
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..bd546be
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,8 @@
+{
+    "C_Cpp.clang_format_fallbackStyle": "Google",
+    "files.associations": {
+        "functional": "c",
+        "helper.h": "c"
+    },
+    "editor.formatOnSave": true
+}
\ No newline at end of file
diff --git a/Implementierung/.gitignore b/Implementierung/.gitignore
new file mode 100644
index 0000000..a811ad3
--- /dev/null
+++ b/Implementierung/.gitignore
@@ -0,0 +1,5 @@
+Makefile
+cmake_install.cmake
+CMakeCache.txt
+md2
+CMakeFiles
\ No newline at end of file
diff --git a/Implementierung/CMakeLists.txt b/Implementierung/CMakeLists.txt
new file mode 100644
index 0000000..e164800
--- /dev/null
+++ b/Implementierung/CMakeLists.txt
@@ -0,0 +1,19 @@
+cmake_minimum_required(VERSION 2.6.0)
+
+# here we specify that the project is C language only, so the default
+# C compiler on the system will be used
+project(md2 C)
+add_executable(md2 "")
+
+set(SOURCE_FILES
+    src/main.c
+    src/helper.c
+    src/io.c
+    src/md2.c
+)
+
+target_sources(md2 PRIVATE ${SOURCE_FILES})
+
+target_include_directories(md2 PUBLIC
+    lib
+)
\ No newline at end of file
diff --git a/Implementierung/Makefile b/Implementierung/Makefile
deleted file mode 100644
index d6b448b..0000000
--- a/Implementierung/Makefile
+++ /dev/null
@@ -1,14 +0,0 @@
-FLAGS=-O3 -std=c11 -g -Wall -Wextra -no-pie
-
-.PHONY: all
-	all: main
-main: main.c toupper.S
-		$(CC) $(CFLAGS) -o $@ $^
-
-.PHONY: clean
-	clean:
-		rm -f main
-
-.PHONY: run
-	run:
-		./main
diff --git a/Implementierung/lib/helper.h b/Implementierung/lib/helper.h
new file mode 100644
index 0000000..90ddbc4
--- /dev/null
+++ b/Implementierung/lib/helper.h
@@ -0,0 +1,34 @@
+#ifndef HELPER_H
+#define HELPER_H
+
+#include <errno.h>
+#include <getopt.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+enum argumentParseResult {
+  RESULT_OK = 0,
+  RESULT_EXIT_SUCCESS,
+  RESULT_EXIT_FAILURE
+};
+
+struct configuration {
+  char* filename;
+  int implementationToUse;
+  int doBenchmark;
+  int benchmarkingCycles;
+};
+
+/**
+ * @brief parse commandline arguments to config and print errors, if any
+ *
+ * @param argc argc
+ * @param argv argv
+ * @param c pointer where the configuration should be stored
+ * @return enum argumentParseResult
+ */
+enum argumentParseResult parseArguments(int argc, char** argv,
+                                        struct configuration* c);
+
+#endif  // HELPER_H
\ No newline at end of file
diff --git a/Implementierung/lib/io.h b/Implementierung/lib/io.h
new file mode 100644
index 0000000..2ed8134
--- /dev/null
+++ b/Implementierung/lib/io.h
@@ -0,0 +1,19 @@
+#ifndef IO_H
+#define IO_H
+
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+
+/**
+ * @brief reads a file at a path
+ *
+ * @param path the filepath
+ * @param size a pointer where the size of the result should be stored
+ * @return the raw data
+ */
+static uint8_t* read_file(const char* path, size_t* size);
+
+#endif  // IO_H
\ No newline at end of file
diff --git a/Implementierung/lib/md2.h b/Implementierung/lib/md2.h
new file mode 100644
index 0000000..3880bb7
--- /dev/null
+++ b/Implementierung/lib/md2.h
@@ -0,0 +1,25 @@
+#ifndef MD2_H
+#define MD2_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+/**
+ * @brief Calculates checksum of buf and stores it in out
+ *
+ * @param len Length of the data at buf
+ * @param buf Location of the data
+ * @param out Destination array of for the checksum
+ */
+void md2_hash(size_t len, const uint8_t buf[], uint8_t out[16]);
+
+/**
+ * @brief Calculates checksum of buf and appends it to buf
+ *
+ * @param len Length of data which the checksum should be calculated of
+ * @param buf Location of the data. Make sure to reserve 16 bytes more so the
+ * chechsum fits!
+ */
+void md2_checksum(size_t len, uint8_t* buf);
+
+#endif  // MD2_H
\ No newline at end of file
diff --git a/Implementierung/main.c b/Implementierung/main.c
deleted file mode 100644
index 0eafbf0..0000000
--- a/Implementierung/main.c
+++ /dev/null
@@ -1,3 +0,0 @@
-int main(int argc, char* argv) {
-    return 0;
-}
diff --git a/Implementierung/src/helper.c b/Implementierung/src/helper.c
new file mode 100644
index 0000000..fa3043b
--- /dev/null
+++ b/Implementierung/src/helper.c
@@ -0,0 +1,88 @@
+#include "helper.h"
+
+int stringToInt(char *string) {
+  char *leftover = "";
+  errno = 0;
+  int x = strtold(string, &leftover);
+  if (*leftover != '\0' || leftover == string) {
+    errno = EINVAL;
+    return -1;
+  }
+  if (errno == ERANGE) {
+    printf("Number is too large or too small!\n");
+    errno = EINVAL;
+    return -1;
+  }
+  errno = 0;
+  return x;
+}
+
+void help(char *progname) {
+  fprintf(
+      stderr,
+      "usage: %s [-V implementation] [-B [repetitons]] [-h] [--help] file\n",
+      progname);
+}
+
+enum argumentParseResult parseArguments(int argc, char **argv,
+                                        struct configuration *c) {
+  if (c == NULL) {
+    return RESULT_EXIT_FAILURE;
+  }
+
+  c->implementationToUse = 0;
+  c->doBenchmark = 0;
+  c->benchmarkingCycles = 1;
+
+  int opt;
+
+  while (1) {
+    static struct option longOptions[] = {{"help", no_argument, NULL, 'h'},
+                                          NULL};
+    int longOptionIndex = 0;
+
+    opt = getopt_long(argc, argv, "V:B::h", longOptions, &longOptionIndex);
+
+    if (-1 == opt) break;
+
+    switch (opt) {
+      case 'B':
+        c->doBenchmark = 1;
+        if (optarg != NULL) {
+          c->benchmarkingCycles = stringToInt(optarg);
+          if (errno == 0) break;
+          fprintf(stderr,
+                  "%s: invalid argument, has to be int -- 'B' got '%s'\n",
+                  argv[0], optarg);
+          help(argv[0]);
+          return RESULT_EXIT_FAILURE;
+        }
+        break;
+      case 'V':
+        c->implementationToUse = stringToInt(optarg);
+        if (errno == 0) break;
+        fprintf(stderr, "%s: invalid argument, has to be int -- 'V' got '%s'\n",
+                argv[0], optarg);
+        help(argv[0]);
+        return RESULT_EXIT_FAILURE;
+
+      case 'h':
+        help(argv[0]);
+        return RESULT_EXIT_SUCCESS;
+
+      default:
+        help(argv[0]);
+        return RESULT_EXIT_FAILURE;
+    }
+  }
+
+  if (argc > optind) {
+    c->filename = argv[optind];
+  } else {
+    fprintf(stderr, "%s: missing poisional argument -- 'file'\n", argv[0]);
+    help(argv[0]);
+    return RESULT_EXIT_FAILURE;
+  }
+
+  return RESULT_OK;
+}
\ No newline at end of file
diff --git a/Implementierung/src/io.c b/Implementierung/src/io.c
new file mode 100644
index 0000000..ee415ce
--- /dev/null
+++ b/Implementierung/src/io.c
@@ -0,0 +1,42 @@
+#include "io.h"
+
+static uint8_t* read_file(const char* path, size_t* size) {
+  // Read the contents of the file specified by path into a heap-allocated
+  // buffer and return a pointer to that buffer.
+  FILE* f = fopen(path, "r");
+  if (f == NULL) {
+    printf("Fopen error: %d\n", errno);
+    fclose(f);
+    return NULL;
+  }
+
+  struct stat statOfFile;
+  int status = fstat(fileno(f), &statOfFile);
+  if (status == -1) {
+    printf("Fstat error: %d\n", errno);
+    fclose(f);
+    return NULL;
+  };
+
+  if ((statOfFile.st_mode & S_IFMT) != S_IFREG) {
+    printf("File is not a regular file!\n");
+    fclose(f);
+    return NULL;
+  }
+
+  uint8_t* data = malloc(statOfFile.st_size);
+
+  size_t bytesRead =
+      fread(data, statOfFile.st_blksize, statOfFile.st_blocks, f);
+  // Or: size_t bytesRead = fread(data, sizeof(char), statOfFile.st_size, f);
+  if (bytesRead != 0 && !feof(f)) {
+    printf("Error reading file!\n");
+    fclose(f);
+    return NULL;
+  }
+
+  fclose(f);
+
+  (*size) = bytesRead;
+  return data;
+}
\ No newline at end of file
diff --git a/Implementierung/src/main.c b/Implementierung/src/main.c
new file mode 100644
index 0000000..db1527a
--- /dev/null
+++ b/Implementierung/src/main.c
@@ -0,0 +1,24 @@
+#include "helper.h"
+#include "io.h"
+#include "md2.h"
+
+int main(int argc, char** argv) {
+  struct configuration c;
+  enum argumentParseResult result = parseArguments(argc, argv, &c);
+
+  switch (result) {
+    case RESULT_EXIT_SUCCESS:
+      return EXIT_SUCCESS;
+    case RESULT_EXIT_FAILURE:
+      return EXIT_FAILURE;
+    default:
+      break;
+  }
+
+  printf(
+      "Hashing file: %s\nUsing implementation: %d, doing benchmark: %d, "
+      "benchmark cycles: %d\n",
+      c.filename, c.implementationToUse, c.doBenchmark, c.benchmarkingCycles);
+
+  return 0;
+}
diff --git a/Implementierung/src/md2.c b/Implementierung/src/md2.c
new file mode 100644
index 0000000..1f30e8d
--- /dev/null
+++ b/Implementierung/src/md2.c
@@ -0,0 +1,8 @@
+#include "io.h"
+
+// The file "testfile" should lead to this hash:
+// fc982e558db259f298b43cd4c1241c66
+
+void md2_checksum(size_t len, uint8_t* buf) {}
+
+void md2_hash(size_t len, const uint8_t buf[len], uint8_t out[16]) {}
\ No newline at end of file
diff --git a/Implementierung/testfile b/Implementierung/testfile
new file mode 100644
index 0000000..d72e1a3
Binary files /dev/null and b/Implementierung/testfile differ
diff --git a/README.md b/README.md
index ee36483..f69843e 100644
--- a/README.md
+++ b/README.md
@@ -7,3 +7,8 @@ Beachten Sie, dass die äußere Form und die Einhaltung der Formalitäten wichti
 - `Implementierung/`: Ihre Implementierung
 - `Implementierung/Makefile`: Makefile für Ihre Implementierung, welches durch einen Aufruf von `make` Ihre Implementierung kompiliert
 - `Vortrag/Vortrag.pdf`: Folien für Ihre Abschlusspräsentation
+
+# Kompilieren
+
+- CMake ausführen: `cmake .`
+- Make ausführen: `make`
\ No newline at end of file