diff --git a/Implementierung/lib/io.h b/Implementierung/lib/io.h
index 4d0ee2f..f780a77 100644
--- a/Implementierung/lib/io.h
+++ b/Implementierung/lib/io.h
@@ -14,10 +14,9 @@
  * @brief reads a file at a path
  *
  * @param path the filepath
- * @param data where to store the pointer to the data
  * @param size a pointer where the size of the result should be stored
- * @return the raw data
+ * @return pointer to the raw data or NULL on errors
  */
-bool read_file(const char* path, uint8_t** data, size_t* size);
+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
index 5fd07d3..a692a12 100644
--- a/Implementierung/lib/md2.h
+++ b/Implementierung/lib/md2.h
@@ -25,6 +25,12 @@ void md2_hash(size_t len, const uint8_t buf[], uint8_t out[16]);
  */
 void md2_checksum(size_t len, uint8_t* buf);
 
+/**
+ * @brief Takes a uint8_t array and converts it into a string
+ *
+ * @param hash the array containing the hash
+ * @param stringHash pointer to store the string, has to have 32 bytes space
+ */
 void encodeHash(uint8_t hash[16], char* stringHash);
 
 #endif  // MD2_H
\ No newline at end of file
diff --git a/Implementierung/src/io.c b/Implementierung/src/io.c
index cd7bee3..dedb5ce 100644
--- a/Implementierung/src/io.c
+++ b/Implementierung/src/io.c
@@ -1,13 +1,13 @@
 #include "../lib/io.h"
 
-bool read_file(const char* path, uint8_t** data, size_t* size) {
+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 false;
+    return NULL;
   }
 
   struct stat statOfFile;
@@ -15,28 +15,28 @@ bool read_file(const char* path, uint8_t** data, size_t* size) {
   if (status == -1) {
     printf("Fstat error: %d\n", errno);
     fclose(f);
-    return false;
+    return NULL;
   };
 
   if ((statOfFile.st_mode & S_IFMT) != S_IFREG) {
     printf("File is not a regular file!\n");
     fclose(f);
-    return false;
+    return NULL;
   }
 
-  (*data) = malloc(statOfFile.st_size);
+  uint8_t* data = malloc(statOfFile.st_size);
 
   size_t bytesRead =
-      fread((*data), statOfFile.st_blksize, statOfFile.st_blocks, f);
+      fread(data, statOfFile.st_blksize, statOfFile.st_blocks, f);
   // size_t bytesRead = fread(data, sizeof(uint8_t), statOfFile.st_size, f);
   if (bytesRead != 0 && !feof(f)) {
     printf("Error reading file!\n");
     fclose(f);
-    return false;
+    return NULL;
   }
 
   fclose(f);
 
   (*size) = statOfFile.st_size;
-  return true;
+  return data;
 }
\ No newline at end of file
diff --git a/Implementierung/src/main.c b/Implementierung/src/main.c
index 4591802..811289d 100644
--- a/Implementierung/src/main.c
+++ b/Implementierung/src/main.c
@@ -67,11 +67,12 @@ int main(int argc, char** argv) {
 
   // runTests();
   size_t len;
-  uint8_t* data;
-  if (!read_file(c.filename, &data, &len)) {
+  uint8_t* data = read_file(c.filename, &len);
+  if (data == NULL) {
     printf("Error reading file %s!", c.filename);
     return EXIT_FAILURE;
   }
+
   printf("File read with size: %zu\n", len);
   printf("\n");