diff --git a/.vscode/settings.json b/.vscode/settings.json
index f97fffe..fcad2d4 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -2,7 +2,14 @@
   "C_Cpp.clang_format_fallbackStyle": "Google",
   "files.associations": {
     "functional": "c",
-    "helper.h": "c"
+    "helper.h": "c",
+    "string": "c",
+    "vector": "c",
+    "memory": "c",
+    "optional": "c",
+    "string_view": "c",
+    "system_error": "c",
+    "variant": "c"
   },
-  "editor.formatOnSave": true,
+  "editor.formatOnSave": true
 }
diff --git a/Implementierung/lib/io.h b/Implementierung/lib/io.h
index 2ed8134..80cfcda 100644
--- a/Implementierung/lib/io.h
+++ b/Implementierung/lib/io.h
@@ -14,6 +14,6 @@
  * @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);
+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 2fb47f7..5fd07d3 100644
--- a/Implementierung/lib/md2.h
+++ b/Implementierung/lib/md2.h
@@ -25,4 +25,6 @@ void md2_hash(size_t len, const uint8_t buf[], uint8_t out[16]);
  */
 void md2_checksum(size_t len, uint8_t* buf);
 
+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 ee415ce..83d1ba6 100644
--- a/Implementierung/src/io.c
+++ b/Implementierung/src/io.c
@@ -1,6 +1,6 @@
 #include "io.h"
 
-static uint8_t* read_file(const char* path, 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");
diff --git a/Implementierung/src/main.c b/Implementierung/src/main.c
index 3f458a3..bdfb3d8 100644
--- a/Implementierung/src/main.c
+++ b/Implementierung/src/main.c
@@ -1,7 +1,52 @@
+#include <stdbool.h>
+
 #include "helper.h"
 #include "io.h"
 #include "md2.h"
 
+// Returns true when val is approx. equal to exp.
+static bool runTest(const char* message, const char* expectedHash) {
+  uint8_t out[16];
+  md2_hash(strlen(message), message, out);
+
+  char hash[32];
+  encodeHash(out, hash);
+
+  bool ok = !strcmp(hash, expectedHash);
+  printf("%s: md2(%s) %s == %s\n", "not ok" + (4 * ok), message, hash,
+         expectedHash);
+  return ok;
+}
+
+unsigned runTests(void) {
+  unsigned failed = 0;
+  // Note: cases with n<2 are not tested here.
+  failed += !runTest("", "8350e5a3e24c153df2275c9f80692773");
+  failed += !runTest("a", "32ec01ec4a6dac72c0ab96fb34c0b5d1");
+  failed += !runTest("abc", "da853b0d3f88d99b30283a69e6ded6bb");
+  failed += !runTest("message digest", "ab4f496bfb2a530b219ff33031fe06b0");
+  failed += !runTest("jebdjcslfhwfdig", "e1b69085c6f6e36cb8fe8d98ed3f2c35");
+  failed += !runTest("0123456789abcde", "d95629645108a20ab4d70e8545e0723b");
+  failed += !runTest("0123456789abcdef", "12c8dfa285f14e1af8c5254e7092d0d3");
+  failed += !runTest("0123456789abcdefg", "e4d0efded5ef7b6843a5ba47e1171347");
+  failed += !runTest("abcdefghijklmnopqrstuvwxyz",
+                     "4e8ddff3650292ab5a4108c3aa47940b");
+  failed +=
+      !runTest("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
+               "da33def2a42df13975352846c30338cd");
+  failed += !runTest(
+      "123456789012345678901234567890123456789012345678901234567890123456789012"
+      "34567890",
+      "d5976f79d83d3a0dc9806c3c66f3efd8");
+
+  if (failed)
+    printf("%u tests FAILED\n", failed);
+  else
+    printf("All tests PASSED\n");
+
+  return failed;
+}
+
 int main(int argc, char** argv) {
   struct configuration c;
   enum argumentParseResult result = parseArguments(argc, argv, &c);
@@ -20,14 +65,19 @@ int main(int argc, char** argv) {
       "benchmark cycles: %d\n",
       c.filename, c.implementationToUse, c.doBenchmark, c.benchmarkingCycles);
 
+  runTests();
+  /*size_t len;
+  uint8_t* data = read_file(c.filename, &len);
+
   uint8_t out[16];
-  md2_hash(3, "abc", out);
+  const char* test = "abcdefghijklmnopqrstuvwxyz";
+  len = strlen(test);
+  md2_hash(len, test, out);
 
   printf("Hash: ");
-  for (int i = 0; i < 16; i++) {
-    printf("%02x", out[i]);
-  }
-  printf("\n");
+  const char hash[16];
+  encodeHash(out, &hash);
+  printf("%s\n", hash);*/
 
   return 0;
 }
diff --git a/Implementierung/src/md2.c b/Implementierung/src/md2.c
index f0ac6bf..03e0b79 100644
--- a/Implementierung/src/md2.c
+++ b/Implementierung/src/md2.c
@@ -48,7 +48,7 @@ void md2_hash(size_t len, const uint8_t buf[len], uint8_t out[16]) {
   uint8_t originalPadding = paddingNeeded;
   len += paddingNeeded;
 
-  printf("len: %d\n", len);
+  // printf("len: %d\n", len);
 
   // +16 for the checksum
   uint8_t* newBuf = calloc(len + 16, sizeof(uint8_t));
@@ -58,14 +58,14 @@ void md2_hash(size_t len, const uint8_t buf[len], uint8_t out[16]) {
     newBuf[len - paddingNeeded] = originalPadding;
     paddingNeeded--;
   }
-  printf("buf with padding: ");
-  printBuf(len + 16, newBuf);
+  // printf("buf with padding: ");
+  // printBuf(len + 16, newBuf);
 
   // === step 2 ===
   md2_checksum(len, newBuf);
 
-  printf("buf with cecksum: ");
-  printBuf(len + 16, newBuf);
+  // printf("buf with cecksum: ");
+  // printBuf(len + 16, newBuf);
 
   // === step 3 ===
   uint8_t* messageDigestBuf = calloc(48, sizeof(uint8_t));
@@ -88,11 +88,17 @@ void md2_hash(size_t len, const uint8_t buf[len], uint8_t out[16]) {
       t = (t + j) % 256;
     }
   }
-  printf("messageDigestBuf: \n");
-  printBuf(16, messageDigestBuf);
+  // printf("messageDigestBuf: \n");
+  // printBuf(16, messageDigestBuf);
 
   memcpy(out, messageDigestBuf, 16);
 
   free(messageDigestBuf);
   free(newBuf);
+}
+
+void encodeHash(uint8_t hash[16], char* stringHash) {
+  for (int i = 0; i < 16; i++) {
+    sprintf(stringHash + (2 * i), "%02x", hash[i]);
+  }
 }
\ No newline at end of file