From b8670dfe623d61b3193bee526d733e061bee9483 Mon Sep 17 00:00:00 2001
From: Thomas Florian <thomas.florian@tum.de>
Date: Fri, 15 Jul 2022 00:01:35 +0200
Subject: [PATCH 01/16] feat: implement threading

---
 Implementierung/Makefile              |   2 +-
 Implementierung/lib/md2_impls/md2_3.h |  23 +++++
 Implementierung/src/md2.c             |   6 ++
 Implementierung/src/md2_impls/md2_2.c |   2 +-
 Implementierung/src/md2_impls/md2_3.c | 130 ++++++++++++++++++++++++++
 5 files changed, 161 insertions(+), 2 deletions(-)
 create mode 100644 Implementierung/lib/md2_impls/md2_3.h
 create mode 100644 Implementierung/src/md2_impls/md2_3.c

diff --git a/Implementierung/Makefile b/Implementierung/Makefile
index 843d95b..f10aa08 100644
--- a/Implementierung/Makefile
+++ b/Implementierung/Makefile
@@ -1,6 +1,6 @@
 
 
-SRC = src/main.c src/helper.c src/io.c src/md2.c src/md2_impls/md2_common.c src/md2_impls/md2_0.c src/md2_impls/md2_2.c
+SRC = src/main.c src/helper.c src/io.c src/md2.c src/md2_impls/md2_common.c src/md2_impls/md2_0.c src/md2_impls/md2_2.c src/md2_impls/md2_3.c
 OBJ = ${subst src,build,${SRC:.c=.o}}
 CC = gcc
 CFLAGS = -Ilib -ggdb -std=c11 -g -Wall -Wextra -no-pie -O3
diff --git a/Implementierung/lib/md2_impls/md2_3.h b/Implementierung/lib/md2_impls/md2_3.h
new file mode 100644
index 0000000..eff7430
--- /dev/null
+++ b/Implementierung/lib/md2_impls/md2_3.h
@@ -0,0 +1,23 @@
+#ifndef MD2_3_H
+#define MD2_3_H
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+/**
+ * @brief This implementation loads the file in bits and not at once
+ *
+ * @param _ unused
+ * @param filename name of the file to load
+ * @param out
+ */
+void md2_hash_3(size_t len, const uint8_t buf[len], uint8_t out[16]);
+void md2_checksum_3(size_t len, uint8_t* buf);
+
+#endif  // MD2_3_H
\ No newline at end of file
diff --git a/Implementierung/src/md2.c b/Implementierung/src/md2.c
index da49453..c4c50da 100644
--- a/Implementierung/src/md2.c
+++ b/Implementierung/src/md2.c
@@ -3,6 +3,7 @@
 // include all implementations
 #include "../lib/md2_impls/md2_0.h"
 #include "../lib/md2_impls/md2_2.h"
+#include "../lib/md2_impls/md2_3.h"
 
 md2_hash_func md2_hash;
 md2_checksum_func md2_checksum;
@@ -28,6 +29,11 @@ bool md2_choose_implementation(int i) {
       md2_checksum = md2_checksum_2;
       return true;
 
+    case 3:
+      md2_hash = md2_hash_3;
+      md2_checksum = md2_checksum_3;
+      return true;
+
     default:
       return false;
   }
diff --git a/Implementierung/src/md2_impls/md2_2.c b/Implementierung/src/md2_impls/md2_2.c
index 1349c0f..7f361fe 100644
--- a/Implementierung/src/md2_impls/md2_2.c
+++ b/Implementierung/src/md2_impls/md2_2.c
@@ -39,7 +39,7 @@ void apply_padding(size_t len, uint8_t buf[16]) {
 }
 
 // unused!
-void md2_checksum_2(size_t, uint8_t*) {}
+void md2_checksum_2(size_t _, uint8_t* __) {}
 
 void md2_hash_2(size_t len, const uint8_t buf[len], uint8_t out[16]) {
   FILE* file;
diff --git a/Implementierung/src/md2_impls/md2_3.c b/Implementierung/src/md2_impls/md2_3.c
new file mode 100644
index 0000000..524e4e6
--- /dev/null
+++ b/Implementierung/src/md2_impls/md2_3.c
@@ -0,0 +1,130 @@
+#include "../../lib/md2_impls/md2_3.h"
+
+#include "../../lib/md2_impls/md2_common.h"
+
+void process_hash(size_t len, uint8_t buf[len], uint8_t messageDigestBuf[48]) {
+  for (size_t i = 0; i < (len + 16) / 16 - 1; i++) {
+    for (int j = 0; j < 16; j++) {
+      messageDigestBuf[16 + j] = buf[i * 16 + j];
+      messageDigestBuf[32 + j] =
+          (messageDigestBuf[16 + j] ^ messageDigestBuf[j]);
+    }
+
+    u_int8_t t = 0;
+
+    for (int j = 0; j < 18; j++) {
+      for (int k = 0; k < 48; k++) {
+        t = messageDigestBuf[k] = messageDigestBuf[k] ^ MD2_PI_SUBST[t];
+      }
+      t = (t + j) % 256;
+    }
+  }
+}
+
+void process_checksum(size_t len, uint8_t buf[len], uint8_t checksum[16]) {
+  uint8_t l = 0;
+
+  for (size_t i = 0; i < len / 16; i++) {
+    for (int j = 0; j < 16; j++) {
+      u_int8_t c = buf[i * 16 + j];
+      // reference is wrong. It says: Set C[j] to S[c xor L]. But it should be:
+      l = checksum[j] ^= MD2_PI_SUBST[c ^ l];
+    }
+  }
+}
+
+// DUPLICATE CODE FROM md2_2.c
+// int apply_padding(size_t len, uint8_t buf[len]) {
+//   int paddingNeeded = 16 - (len % 16);
+//   uint8_t originalPadding = paddingNeeded;
+//   len += paddingNeeded;
+
+//   while (paddingNeeded > 0) {
+//     buf[len - paddingNeeded] = originalPadding;
+//     paddingNeeded--;
+//   }
+//   return len;
+// }
+
+// unused!
+void md2_checksum_3(size_t _, uint8_t* __) {}
+
+void md2_hash_3(size_t len, const uint8_t buf[len], uint8_t out[16]) {
+  // === step 1 ===
+  int paddingNeeded = 16 - (len % 16);
+  uint8_t originalPadding = paddingNeeded;
+  len += paddingNeeded;
+
+  uint8_t* newBuf = calloc(len + 16, sizeof(uint8_t));
+  if (newBuf == NULL) {
+    return;
+  }
+
+  memcpy(newBuf, buf, len - paddingNeeded);
+
+  while (paddingNeeded > 0) {
+    newBuf[len - paddingNeeded] = originalPadding;
+    paddingNeeded--;
+  }
+
+  // === step 3 ===
+  uint8_t* messageDigestBuf = calloc(48, sizeof(uint8_t));
+  if (messageDigestBuf == NULL) {
+    return;
+  }
+
+  // === step 4 ===
+  uint8_t* checksum = calloc(16, sizeof(uint8_t));
+  if (checksum == NULL) {
+    return;
+  }
+
+  int hashPipe[2];
+  int checksumPipe[2];
+
+  if (pipe(hashPipe) == -1 || pipe(checksumPipe) == -1) {
+    return;
+  }
+
+  pid_t pid_1, pid_2;
+  (pid_1 = fork()) && (pid_2 = fork());
+
+  if (pid_1 == 0) {
+    // Child 1 process
+    close(hashPipe[0]);
+    process_hash(len, newBuf, messageDigestBuf);
+    write(hashPipe[1], messageDigestBuf, 48);
+    exit(0);
+
+  } else if (pid_2 == 0) {
+    // Child 2 process
+    close(checksumPipe[0]);
+    process_checksum(len, newBuf, checksum);
+    write(checksumPipe[1], checksum, 16);
+    exit(0);
+  } else {
+    // int status;
+    // Parent process
+    close(hashPipe[1]);
+    close(checksumPipe[1]);
+
+    waitpid(pid_1, NULL, 0);
+    waitpid(pid_2, NULL, 0);
+
+    read(hashPipe[0], messageDigestBuf, 48);
+    read(checksumPipe[0], checksum, 16);
+
+    process_hash(16, checksum, messageDigestBuf);
+    memcpy(out, messageDigestBuf, 16);
+
+    // free(data);
+    free(messageDigestBuf);
+    free(checksum);
+  }
+
+  // process_block_checksum(data, checksum, &l);
+  // process_block_hash(data, messageDigestBuf);
+
+  // process_block_checksum(data, checksum, &l);
+  // process_block_hash(data, messageDigestBuf);
+}

From df9f09d9df351fa75f93ab855d993bc04d8412f8 Mon Sep 17 00:00:00 2001
From: finn <ge95rid@mytum.de>
Date: Fri, 15 Jul 2022 11:30:19 +0200
Subject: [PATCH 02/16] Implementation 1 created

---
 Implementierung/Makefile  | 2 +-
 Implementierung/src/md2.c | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/Implementierung/Makefile b/Implementierung/Makefile
index 843d95b..228eb39 100644
--- a/Implementierung/Makefile
+++ b/Implementierung/Makefile
@@ -1,6 +1,6 @@
 
 
-SRC = src/main.c src/helper.c src/io.c src/md2.c src/md2_impls/md2_common.c src/md2_impls/md2_0.c src/md2_impls/md2_2.c
+SRC = src/main.c src/helper.c src/io.c src/md2.c src/md2_impls/md2_common.c src/md2_impls/md2_0.c src/md2_impls/md2_2.c src/md2_impls/md2_1.c
 OBJ = ${subst src,build,${SRC:.c=.o}}
 CC = gcc
 CFLAGS = -Ilib -ggdb -std=c11 -g -Wall -Wextra -no-pie -O3
diff --git a/Implementierung/src/md2.c b/Implementierung/src/md2.c
index da49453..de9b908 100644
--- a/Implementierung/src/md2.c
+++ b/Implementierung/src/md2.c
@@ -2,6 +2,7 @@
 
 // include all implementations
 #include "../lib/md2_impls/md2_0.h"
+#include "../lib/md2_impls/md2_1.h"
 #include "../lib/md2_impls/md2_2.h"
 
 md2_hash_func md2_hash;
@@ -23,6 +24,11 @@ bool md2_choose_implementation(int i) {
       md2_checksum = md2_checksum_0;
       return true;
 
+    case 1:
+      md2_hash = md2_hash_1;
+      md2_checksum = md2_checksum_1;
+      return true;
+
     case 2:
       md2_hash = md2_hash_2;
       md2_checksum = md2_checksum_2;

From 8c997087e9d68caf443bd676a6ce5f687cf64976 Mon Sep 17 00:00:00 2001
From: finn <ge95rid@mytum.de>
Date: Fri, 15 Jul 2022 11:32:22 +0200
Subject: [PATCH 03/16] Implementation 1 created

---
 Implementierung/lib/md2_impls/md2_1.h | 23 ++++++++
 Implementierung/src/md2_impls/md2_1.c | 75 +++++++++++++++++++++++++++
 2 files changed, 98 insertions(+)
 create mode 100644 Implementierung/lib/md2_impls/md2_1.h
 create mode 100644 Implementierung/src/md2_impls/md2_1.c

diff --git a/Implementierung/lib/md2_impls/md2_1.h b/Implementierung/lib/md2_impls/md2_1.h
new file mode 100644
index 0000000..8777277
--- /dev/null
+++ b/Implementierung/lib/md2_impls/md2_1.h
@@ -0,0 +1,23 @@
+#ifndef MD2_1_H
+#define MD2_1_H
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+
+#include "../io.h"
+
+/**
+ * @brief This implementation optimizes small operations and uses SIMD
+ *
+ * @param _ unused
+ * @param filename name of the file to load
+ * @param out
+ */
+void md2_hash_1(size_t len, const uint8_t buf[len], uint8_t out[16]);
+void md2_checksum_1(size_t len, uint8_t* buf);
+
+#endif  // MD2_1_H
\ No newline at end of file
diff --git a/Implementierung/src/md2_impls/md2_1.c b/Implementierung/src/md2_impls/md2_1.c
new file mode 100644
index 0000000..6e997ed
--- /dev/null
+++ b/Implementierung/src/md2_impls/md2_1.c
@@ -0,0 +1,75 @@
+#include "../../lib/md2_impls/md2_1.h"
+
+#include "../../lib/md2_impls/md2_common.h"
+
+void md2_checksum_1(size_t len, uint8_t* buf) {
+  uint8_t l = 0;
+
+  for (size_t i = 0; i < len / 16; i++) {
+    for (int j = 0; j < 16; j++) {
+      u_int8_t c = buf[i * 16 + j];
+      // reference is wrong. It says: Set C[j] to S[c xor L]. But it should be:
+      buf[len + j] ^= MD2_PI_SUBST[c ^ l];
+      l = buf[len + j];
+    }
+  }
+}
+
+void md2_hash_1(size_t len, const uint8_t buf[len], uint8_t out[16]) {
+  // === step 1 ===
+  int paddingNeeded = 16 - (len & 7);
+  uint8_t originalPadding = paddingNeeded;
+  len += paddingNeeded;
+
+  // printf("len: %d\n", len);
+
+  // +16 for the checksum
+  uint8_t* newBuf = calloc(len + 16, sizeof(uint8_t));
+  // TODO: null check
+  memcpy(newBuf, buf, len - paddingNeeded);
+
+  // printBuf(len + 16, newBuf);
+
+  while (paddingNeeded > 0) {
+    newBuf[len - paddingNeeded] = originalPadding;
+    paddingNeeded--;
+  }
+  // printf("buf with padding: ");
+  // printBuf(len + 16, newBuf);
+
+  // === step 2 ===
+  md2_checksum_1(len, newBuf);
+
+  // printf("buf with cecksum: ");
+  // printBuf(len + 16, newBuf);
+
+  // === step 3 ===
+  uint8_t* messageDigestBuf = calloc(48, sizeof(uint8_t));
+  // TODO: add null check
+
+  // === step 4 ===
+  // <= because we need to hash the last block too
+  for (size_t i = 0; i <= (len + 16) / 16 - 1; i++) {
+    for (int j = 0; j < 16; j++) {
+      messageDigestBuf[16 + j] = newBuf[i * 16 + j];
+      messageDigestBuf[32 + j] =
+          (messageDigestBuf[16 + j] ^ messageDigestBuf[j]);
+    }
+
+    u_int8_t t = 0;
+
+    for (int j = 0; j < 18; j++) {
+      for (int k = 0; k < 48; k++) {
+        t = messageDigestBuf[k] = messageDigestBuf[k] ^ MD2_PI_SUBST[t];
+      }
+      t = (t + j) & 127;
+    }
+  }
+  // printf("messageDigestBuf: \n");
+  // printBuf(16, messageDigestBuf);
+
+  memcpy(out, messageDigestBuf, 16);
+
+  free(messageDigestBuf);
+  free(newBuf);
+}
\ No newline at end of file

From 88ee99b37c8ad7e8dca8664fb10ca693fcd96a38 Mon Sep 17 00:00:00 2001
From: finn <ge95rid@mytum.de>
Date: Mon, 18 Jul 2022 21:22:03 +0200
Subject: [PATCH 04/16] Feat: SIMD of for loop

---
 Implementierung/src/md2_impls/md2_1.c | 100 ++++++++++++++++++++------
 1 file changed, 80 insertions(+), 20 deletions(-)

diff --git a/Implementierung/src/md2_impls/md2_1.c b/Implementierung/src/md2_impls/md2_1.c
index 6e997ed..d4e2943 100644
--- a/Implementierung/src/md2_impls/md2_1.c
+++ b/Implementierung/src/md2_impls/md2_1.c
@@ -1,12 +1,17 @@
 #include "../../lib/md2_impls/md2_1.h"
 
 #include "../../lib/md2_impls/md2_common.h"
+#include <immintrin.h>
 
-void md2_checksum_1(size_t len, uint8_t* buf) {
+
+void md2_checksum_1(size_t len, uint8_t *buf)
+{
   uint8_t l = 0;
 
-  for (size_t i = 0; i < len / 16; i++) {
-    for (int j = 0; j < 16; j++) {
+  for (size_t i = 0; i < len / 16; i++)
+  {
+    for (int j = 0; j < 16; j++)
+    {
       u_int8_t c = buf[i * 16 + j];
       // reference is wrong. It says: Set C[j] to S[c xor L]. But it should be:
       buf[len + j] ^= MD2_PI_SUBST[c ^ l];
@@ -15,27 +20,50 @@ void md2_checksum_1(size_t len, uint8_t* buf) {
   }
 }
 
-void md2_hash_1(size_t len, const uint8_t buf[len], uint8_t out[16]) {
+static uint8_t PADDING[17][16] = {
+    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+    {1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+    {2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+    {3, 3, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+    {4, 4, 4, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+    {5, 5, 5, 5, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+    {6, 6, 6, 6, 6, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+    {7, 7, 7, 7, 7, 7, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+    {8, 8, 8, 8, 8, 8, 8, 8, 0, 0, 0, 0, 0, 0, 0, 0},
+    {9, 9, 9, 9, 9, 9, 9, 9, 9, 0, 0, 0, 0, 0, 0, 0},
+    {10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 0, 0, 0, 0, 0, 0},
+    {11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 0, 0, 0, 0, 0},
+    {12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 0, 0, 0, 0},
+    {13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 0, 0, 0},
+    {14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 0, 0},
+    {15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 0},
+    {16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16}};
+
+void md2_hash_1(size_t len, const uint8_t buf[len], uint8_t out[16])
+{
   // === step 1 ===
-  int paddingNeeded = 16 - (len & 7);
-  uint8_t originalPadding = paddingNeeded;
+  int paddingNeeded = 16 - (len & 15);
   len += paddingNeeded;
 
   // printf("len: %d\n", len);
 
   // +16 for the checksum
-  uint8_t* newBuf = calloc(len + 16, sizeof(uint8_t));
+  uint8_t* newBuf = aligned_alloc(16, sizeof(uint8_t)*(len + 16));
+
+  for(size_t i = 0; i < 16; i++) {
+    newBuf[len + i] = 0;
+  }
+  
+  // uint8_t* newBuf = calloc(len + 16, sizeof(uint8_t));
   // TODO: null check
   memcpy(newBuf, buf, len - paddingNeeded);
 
-  // printBuf(len + 16, newBuf);
+  //md2_print_buf(len + 16, newBuf);
+
+  memcpy(newBuf + len - paddingNeeded, PADDING + paddingNeeded, paddingNeeded);
 
-  while (paddingNeeded > 0) {
-    newBuf[len - paddingNeeded] = originalPadding;
-    paddingNeeded--;
-  }
   // printf("buf with padding: ");
-  // printBuf(len + 16, newBuf);
+  //md2_print_buf(len + 16, newBuf);
 
   // === step 2 ===
   md2_checksum_1(len, newBuf);
@@ -44,25 +72,57 @@ void md2_hash_1(size_t len, const uint8_t buf[len], uint8_t out[16]) {
   // printBuf(len + 16, newBuf);
 
   // === step 3 ===
-  uint8_t* messageDigestBuf = calloc(48, sizeof(uint8_t));
+  uint8_t *messageDigestBuf = aligned_alloc(16, sizeof(uint8_t) * 48);
   // TODO: add null check
+  for (size_t i = 0; i < 48; i++) {
+    messageDigestBuf[i] = 0;
+  }
 
   // === step 4 ===
   // <= because we need to hash the last block too
-  for (size_t i = 0; i <= (len + 16) / 16 - 1; i++) {
-    for (int j = 0; j < 16; j++) {
-      messageDigestBuf[16 + j] = newBuf[i * 16 + j];
+  __m128i vx;
+  __m128i vy;
+  for (size_t i = 0; i <= (len + 16) / 16 - 1; i++)
+  {
+    
+    vx = _mm_load_si128((__m128i*) (newBuf + i * 16));
+    _mm_store_si128((__m128i*) (messageDigestBuf + 16), vx);
+    vy = _mm_load_si128((__m128i*) (messageDigestBuf));
+    vy = _mm_xor_si128(vy, vx);
+    _mm_store_si128((__m128i*) (messageDigestBuf + 32), vy);
+    
+    
+    /*
+    for (int j = 0; j < 16; j++)
+    {
+      //messageDigestBuf[16 + j] = newBuf[i * 16 + j];
       messageDigestBuf[32 + j] =
           (messageDigestBuf[16 + j] ^ messageDigestBuf[j]);
     }
+    /*
+    vy = _mm_load_si128((__m128i*) (messageDigestBuf));
+    _mm_xor_si128(vy, vx);
+    _mm_store_si128((__m128i*) messageDigestBuf, vy);
+    md2_print_buf(48, messageDigestBuf);
+    md2_print_buf(len + 16, newBuf);
+    /*
+    printf("newBuf: erstes Element:");
+    printf(*(newBuf + i * 16));
+    printf("mdb:");
+    printf(*(messageDigestBuf + 16));
+    */
+    
+    
 
     u_int8_t t = 0;
 
-    for (int j = 0; j < 18; j++) {
-      for (int k = 0; k < 48; k++) {
+    for (int j = 0; j < 18; j++)
+    {
+      for (int k = 0; k < 48; k++)
+      {
         t = messageDigestBuf[k] = messageDigestBuf[k] ^ MD2_PI_SUBST[t];
       }
-      t = (t + j) & 127;
+      t = (t + j) & 255;
     }
   }
   // printf("messageDigestBuf: \n");

From fda4ee592da04fc393cced62b622d7b9248475ba Mon Sep 17 00:00:00 2001
From: finn <ge95rid@mytum.de>
Date: Mon, 18 Jul 2022 21:28:38 +0200
Subject: [PATCH 05/16] Feat: added Nullchecks for malloc/calloc

---
 Implementierung/src/io.c              |  4 ++
 Implementierung/src/md2_impls/md2_0.c | 11 +++++-
 Implementierung/src/md2_impls/md2_1.c | 53 ++++++---------------------
 Implementierung/src/md2_impls/md2_2.c | 12 ++++++
 4 files changed, 36 insertions(+), 44 deletions(-)

diff --git a/Implementierung/src/io.c b/Implementierung/src/io.c
index 339bd75..048aee7 100644
--- a/Implementierung/src/io.c
+++ b/Implementierung/src/io.c
@@ -34,6 +34,10 @@ uint8_t* read_file(const char* path, size_t* size) {
   }
 
   uint8_t* data = malloc(statOfFile.st_size);
+  if (data == NULL) {
+    printf("Failure: malloc returns NULL");
+    return -1;
+  }
 
   size_t bytesRead =
       fread(data, statOfFile.st_blksize, statOfFile.st_blocks, f);
diff --git a/Implementierung/src/md2_impls/md2_0.c b/Implementierung/src/md2_impls/md2_0.c
index eeb4354..c344325 100644
--- a/Implementierung/src/md2_impls/md2_0.c
+++ b/Implementierung/src/md2_impls/md2_0.c
@@ -25,7 +25,10 @@ void md2_hash_0(size_t len, const uint8_t buf[len], uint8_t out[16]) {
 
   // +16 for the checksum
   uint8_t* newBuf = calloc(len + 16, sizeof(uint8_t));
-  // TODO: null check
+  if (newBuf == NULL) {
+    printf("Failure: calloc returns NULL");
+    return -1;
+  }
   memcpy(newBuf, buf, len - paddingNeeded);
 
   // printBuf(len + 16, newBuf);
@@ -45,7 +48,11 @@ void md2_hash_0(size_t len, const uint8_t buf[len], uint8_t out[16]) {
 
   // === step 3 ===
   uint8_t* messageDigestBuf = calloc(48, sizeof(uint8_t));
-  // TODO: add null check
+  if (messageDigestBuf == NULL) {
+    printf("Failure: calloc returns NULL");
+    return -1;
+  }
+
 
   // === step 4 ===
   // <= because we need to hash the last block too
diff --git a/Implementierung/src/md2_impls/md2_1.c b/Implementierung/src/md2_impls/md2_1.c
index d4e2943..ff2f1ff 100644
--- a/Implementierung/src/md2_impls/md2_1.c
+++ b/Implementierung/src/md2_impls/md2_1.c
@@ -45,74 +45,45 @@ void md2_hash_1(size_t len, const uint8_t buf[len], uint8_t out[16])
   int paddingNeeded = 16 - (len & 15);
   len += paddingNeeded;
 
-  // printf("len: %d\n", len);
-
-  // +16 for the checksum
   uint8_t* newBuf = aligned_alloc(16, sizeof(uint8_t)*(len + 16));
+  if (newBuf == NULL) {
+    printf("Failure: aligned_alloc returns NULL");
+    return -1;
+  }
 
   for(size_t i = 0; i < 16; i++) {
     newBuf[len + i] = 0;
   }
-  
-  // uint8_t* newBuf = calloc(len + 16, sizeof(uint8_t));
-  // TODO: null check
+
   memcpy(newBuf, buf, len - paddingNeeded);
 
-  //md2_print_buf(len + 16, newBuf);
-
   memcpy(newBuf + len - paddingNeeded, PADDING + paddingNeeded, paddingNeeded);
 
-  // printf("buf with padding: ");
-  //md2_print_buf(len + 16, newBuf);
-
   // === step 2 ===
   md2_checksum_1(len, newBuf);
 
-  // printf("buf with cecksum: ");
-  // printBuf(len + 16, newBuf);
-
   // === step 3 ===
   uint8_t *messageDigestBuf = aligned_alloc(16, sizeof(uint8_t) * 48);
-  // TODO: add null check
+  if (messageDigestBuf == NULL) {
+    printf("Failure: aligned_alloc returns NULL");
+    return -1;
+  }
+
   for (size_t i = 0; i < 48; i++) {
     messageDigestBuf[i] = 0;
   }
 
   // === step 4 ===
-  // <= because we need to hash the last block too
   __m128i vx;
   __m128i vy;
   for (size_t i = 0; i <= (len + 16) / 16 - 1; i++)
   {
-    
     vx = _mm_load_si128((__m128i*) (newBuf + i * 16));
     _mm_store_si128((__m128i*) (messageDigestBuf + 16), vx);
     vy = _mm_load_si128((__m128i*) (messageDigestBuf));
     vy = _mm_xor_si128(vy, vx);
     _mm_store_si128((__m128i*) (messageDigestBuf + 32), vy);
-    
-    
-    /*
-    for (int j = 0; j < 16; j++)
-    {
-      //messageDigestBuf[16 + j] = newBuf[i * 16 + j];
-      messageDigestBuf[32 + j] =
-          (messageDigestBuf[16 + j] ^ messageDigestBuf[j]);
-    }
-    /*
-    vy = _mm_load_si128((__m128i*) (messageDigestBuf));
-    _mm_xor_si128(vy, vx);
-    _mm_store_si128((__m128i*) messageDigestBuf, vy);
-    md2_print_buf(48, messageDigestBuf);
-    md2_print_buf(len + 16, newBuf);
-    /*
-    printf("newBuf: erstes Element:");
-    printf(*(newBuf + i * 16));
-    printf("mdb:");
-    printf(*(messageDigestBuf + 16));
-    */
-    
-    
+  
 
     u_int8_t t = 0;
 
@@ -125,8 +96,6 @@ void md2_hash_1(size_t len, const uint8_t buf[len], uint8_t out[16])
       t = (t + j) & 255;
     }
   }
-  // printf("messageDigestBuf: \n");
-  // printBuf(16, messageDigestBuf);
 
   memcpy(out, messageDigestBuf, 16);
 
diff --git a/Implementierung/src/md2_impls/md2_2.c b/Implementierung/src/md2_impls/md2_2.c
index 1349c0f..b0955ba 100644
--- a/Implementierung/src/md2_impls/md2_2.c
+++ b/Implementierung/src/md2_impls/md2_2.c
@@ -50,12 +50,24 @@ void md2_hash_2(size_t len, const uint8_t buf[len], uint8_t out[16]) {
 
   // === step 3 ===
   uint8_t* messageDigestBuf = calloc(48, sizeof(uint8_t));
+  if (messageDigestBuf == NULL) {
+    printf("Failure: calloc returns NULL");
+    return -1;
+  }
 
   // === step 4 ===
   uint8_t l = 0;
   uint8_t* checksum = calloc(16, sizeof(uint8_t));
+  if (checksum == NULL) {
+    printf("Failure: calloc returns NULL");
+    return -1;
+  }
 
   uint8_t* data = malloc(16);
+  if (data == NULL) {
+    printf("Failure: malloc returns NULL");
+    return -1;
+  }
   size_t bytes_left_to_read = file_stat.st_size;
   size_t bytes_left_to_process = 0;
 

From 0ee32c8a84b47be262ae50fa45ba967efb4e6b26 Mon Sep 17 00:00:00 2001
From: Thomas Florian <thomas.florian@tum.de>
Date: Tue, 19 Jul 2022 22:27:56 +0200
Subject: [PATCH 06/16] feat: add data transfer between threads

---
 Implementierung/Makefile              |   4 +-
 Implementierung/lib/md2_impls/md2_3.h |   3 +-
 Implementierung/src/md2_impls/md2_3.c | 133 +++++++++++++++-----------
 3 files changed, 80 insertions(+), 60 deletions(-)

diff --git a/Implementierung/Makefile b/Implementierung/Makefile
index f10aa08..9bc5a18 100644
--- a/Implementierung/Makefile
+++ b/Implementierung/Makefile
@@ -3,8 +3,8 @@
 SRC = src/main.c src/helper.c src/io.c src/md2.c src/md2_impls/md2_common.c src/md2_impls/md2_0.c src/md2_impls/md2_2.c src/md2_impls/md2_3.c
 OBJ = ${subst src,build,${SRC:.c=.o}}
 CC = gcc
-CFLAGS = -Ilib -ggdb -std=c11 -g -Wall -Wextra -no-pie -O3
-LDFLAGS = 
+CFLAGS = -Ilib -ggdb -std=c11 -g -Wall -Wextra -no-pie -O3 
+LDFLAGS = -pthread
 
 all: md2
 
diff --git a/Implementierung/lib/md2_impls/md2_3.h b/Implementierung/lib/md2_impls/md2_3.h
index eff7430..8d1ff1f 100644
--- a/Implementierung/lib/md2_impls/md2_3.h
+++ b/Implementierung/lib/md2_impls/md2_3.h
@@ -1,6 +1,7 @@
 #ifndef MD2_3_H
 #define MD2_3_H
 
+#include <pthread.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -8,7 +9,7 @@
 #include <string.h>
 #include <sys/types.h>
 #include <sys/wait.h>
-#include <unistd.h>
+#include <unistd.h>q
 
 /**
  * @brief This implementation loads the file in bits and not at once
diff --git a/Implementierung/src/md2_impls/md2_3.c b/Implementierung/src/md2_impls/md2_3.c
index 524e4e6..d3c332f 100644
--- a/Implementierung/src/md2_impls/md2_3.c
+++ b/Implementierung/src/md2_impls/md2_3.c
@@ -2,7 +2,20 @@
 
 #include "../../lib/md2_impls/md2_common.h"
 
-void process_hash(size_t len, uint8_t buf[len], uint8_t messageDigestBuf[48]) {
+struct arg_hash {
+  size_t len;
+  const uint8_t* buf;
+  uint8_t messageDigestBuf[48];
+};
+
+struct arg_checksum {
+  size_t len;
+  uint8_t* buf;
+  uint8_t checksum[16];
+};
+
+void process_nothread_hash(size_t len, uint8_t buf[len],
+                           uint8_t messageDigestBuf[48]) {
   for (size_t i = 0; i < (len + 16) / 16 - 1; i++) {
     for (int j = 0; j < 16; j++) {
       messageDigestBuf[16 + j] = buf[i * 16 + j];
@@ -21,30 +34,43 @@ void process_hash(size_t len, uint8_t buf[len], uint8_t messageDigestBuf[48]) {
   }
 }
 
-void process_checksum(size_t len, uint8_t buf[len], uint8_t checksum[16]) {
-  uint8_t l = 0;
-
-  for (size_t i = 0; i < len / 16; i++) {
+void* process_hash(void* args) {
+  struct arg_hash* arg = (struct arg_hash*)args;
+  printf("process_hash: %zu\n", arg->len);
+  for (size_t i = 0; i < (arg->len + 16) / 16 - 1; i++) {
     for (int j = 0; j < 16; j++) {
-      u_int8_t c = buf[i * 16 + j];
-      // reference is wrong. It says: Set C[j] to S[c xor L]. But it should be:
-      l = checksum[j] ^= MD2_PI_SUBST[c ^ l];
+      arg->messageDigestBuf[16 + j] = arg->buf[i * 16 + j];
+      arg->messageDigestBuf[32 + j] =
+          (arg->messageDigestBuf[16 + j] ^ arg->messageDigestBuf[j]);
+    }
+
+    u_int8_t t = 0;
+
+    for (int j = 0; j < 18; j++) {
+      for (int k = 0; k < 48; k++) {
+        t = arg->messageDigestBuf[k] =
+            arg->messageDigestBuf[k] ^ MD2_PI_SUBST[t];
+      }
+      t = (t + j) % 256;
     }
   }
+  md2_print_buf(48, arg->messageDigestBuf);
+  pthread_exit(NULL);
 }
 
-// DUPLICATE CODE FROM md2_2.c
-// int apply_padding(size_t len, uint8_t buf[len]) {
-//   int paddingNeeded = 16 - (len % 16);
-//   uint8_t originalPadding = paddingNeeded;
-//   len += paddingNeeded;
+void* process_checksum(void* args) {
+  struct arg_checksum* arg = (struct arg_checksum*)args;
+  uint8_t l = 0;
 
-//   while (paddingNeeded > 0) {
-//     buf[len - paddingNeeded] = originalPadding;
-//     paddingNeeded--;
-//   }
-//   return len;
-// }
+  for (size_t i = 0; i < arg->len / 16; i++) {
+    for (int j = 0; j < 16; j++) {
+      u_int8_t c = arg->buf[i * 16 + j];
+      // reference is wrong. It says: Set C[j] to S[c xor L]. But it should be:
+      l = arg->checksum[j] ^= MD2_PI_SUBST[c ^ l];
+    }
+  }
+  pthread_exit(&arg->checksum);
+}
 
 // unused!
 void md2_checksum_3(size_t _, uint8_t* __) {}
@@ -79,48 +105,41 @@ void md2_hash_3(size_t len, const uint8_t buf[len], uint8_t out[16]) {
     return;
   }
 
-  int hashPipe[2];
-  int checksumPipe[2];
+  pthread_t thread_1, thread_2;
 
-  if (pipe(hashPipe) == -1 || pipe(checksumPipe) == -1) {
-    return;
+  struct arg_hash arg_1 = {len, newBuf, messageDigestBuf};
+  struct arg_checksum arg_2 = {len, newBuf, checksum};
+
+  if (pthread_create(&thread_1, NULL, process_hash, (void*)&arg_1) != 0) {
+    printf("Error creating thread 1\n");
+    exit(EXIT_FAILURE);
+  }
+  if (pthread_create(&thread_2, NULL, process_checksum, (void*)&arg_2) != 0) {
+    printf("Error creating thread 2\n");
+    exit(EXIT_FAILURE);
   }
 
-  pid_t pid_1, pid_2;
-  (pid_1 = fork()) && (pid_2 = fork());
-
-  if (pid_1 == 0) {
-    // Child 1 process
-    close(hashPipe[0]);
-    process_hash(len, newBuf, messageDigestBuf);
-    write(hashPipe[1], messageDigestBuf, 48);
-    exit(0);
-
-  } else if (pid_2 == 0) {
-    // Child 2 process
-    close(checksumPipe[0]);
-    process_checksum(len, newBuf, checksum);
-    write(checksumPipe[1], checksum, 16);
-    exit(0);
-  } else {
-    // int status;
-    // Parent process
-    close(hashPipe[1]);
-    close(checksumPipe[1]);
-
-    waitpid(pid_1, NULL, 0);
-    waitpid(pid_2, NULL, 0);
-
-    read(hashPipe[0], messageDigestBuf, 48);
-    read(checksumPipe[0], checksum, 16);
-
-    process_hash(16, checksum, messageDigestBuf);
-    memcpy(out, messageDigestBuf, 16);
-
-    // free(data);
-    free(messageDigestBuf);
-    free(checksum);
+  if (pthread_join(thread_1, NULL) != 0) {
+    printf("Error joining thread 1\n");
+    exit(EXIT_FAILURE);
   }
+  if (pthread_join(thread_2, NULL) != 0) {
+    printf("Error joining thread 2\n");
+    exit(EXIT_FAILURE);
+  }
+
+  md2_print_buf(48, arg_1.messageDigestBuf);
+  // md2_print_buf(16, checksum);
+
+  // struct arg_hash arg_last = {16, checksum, messageDigestBuf};
+
+  process_nothread_hash(16, arg_2.checksum, arg_1.messageDigestBuf);
+  // md2_print_buf(16, messageDigestBuf);
+  memcpy(out, arg_1.messageDigestBuf, 16);
+
+  // free(data);
+  free(messageDigestBuf);
+  free(checksum);
 
   // process_block_checksum(data, checksum, &l);
   // process_block_hash(data, messageDigestBuf);

From 8d171fe0c6a981e8829a72dbb4802c36f43096c4 Mon Sep 17 00:00:00 2001
From: Thomas Florian <thomas.florian@tum.de>
Date: Tue, 19 Jul 2022 23:07:05 +0200
Subject: [PATCH 07/16] fix: correct hash calculation on V3

---
 Implementierung/src/md2_impls/md2_3.c | 97 +++++++++++----------------
 1 file changed, 38 insertions(+), 59 deletions(-)

diff --git a/Implementierung/src/md2_impls/md2_3.c b/Implementierung/src/md2_impls/md2_3.c
index d3c332f..c8334be 100644
--- a/Implementierung/src/md2_impls/md2_3.c
+++ b/Implementierung/src/md2_impls/md2_3.c
@@ -2,16 +2,9 @@
 
 #include "../../lib/md2_impls/md2_common.h"
 
-struct arg_hash {
+struct thread_args {
   size_t len;
   const uint8_t* buf;
-  uint8_t messageDigestBuf[48];
-};
-
-struct arg_checksum {
-  size_t len;
-  uint8_t* buf;
-  uint8_t checksum[16];
 };
 
 void process_nothread_hash(size_t len, uint8_t buf[len],
@@ -34,49 +27,57 @@ void process_nothread_hash(size_t len, uint8_t buf[len],
   }
 }
 
-void* process_hash(void* args) {
-  struct arg_hash* arg = (struct arg_hash*)args;
-  printf("process_hash: %zu\n", arg->len);
-  for (size_t i = 0; i < (arg->len + 16) / 16 - 1; i++) {
+void* process_hash(void* threadArgs) {
+  struct thread_args* args = (struct thread_args*)threadArgs;
+
+  uint8_t* messageDigestBuf = calloc(48, sizeof(uint8_t));
+  if (messageDigestBuf == NULL) {
+    return;
+  }
+
+  for (size_t i = 0; i < (args->len + 16) / 16 - 1; i++) {
     for (int j = 0; j < 16; j++) {
-      arg->messageDigestBuf[16 + j] = arg->buf[i * 16 + j];
-      arg->messageDigestBuf[32 + j] =
-          (arg->messageDigestBuf[16 + j] ^ arg->messageDigestBuf[j]);
+      messageDigestBuf[16 + j] = args->buf[i * 16 + j];
+      messageDigestBuf[32 + j] =
+          (messageDigestBuf[16 + j] ^ messageDigestBuf[j]);
     }
 
     u_int8_t t = 0;
 
     for (int j = 0; j < 18; j++) {
       for (int k = 0; k < 48; k++) {
-        t = arg->messageDigestBuf[k] =
-            arg->messageDigestBuf[k] ^ MD2_PI_SUBST[t];
+        t = messageDigestBuf[k] = messageDigestBuf[k] ^ MD2_PI_SUBST[t];
       }
       t = (t + j) % 256;
     }
   }
-  md2_print_buf(48, arg->messageDigestBuf);
-  pthread_exit(NULL);
+  pthread_exit(messageDigestBuf);
 }
 
-void* process_checksum(void* args) {
-  struct arg_checksum* arg = (struct arg_checksum*)args;
+void* process_checksum(void* threasdArgs) {
+  struct thread_args* args = (struct thread_args*)threasdArgs;
+
+  uint8_t* checksum = calloc(16, sizeof(uint8_t));
+  if (checksum == NULL) {
+    return;
+  }
+
   uint8_t l = 0;
 
-  for (size_t i = 0; i < arg->len / 16; i++) {
+  for (size_t i = 0; i < args->len / 16; i++) {
     for (int j = 0; j < 16; j++) {
-      u_int8_t c = arg->buf[i * 16 + j];
+      u_int8_t c = args->buf[i * 16 + j];
       // reference is wrong. It says: Set C[j] to S[c xor L]. But it should be:
-      l = arg->checksum[j] ^= MD2_PI_SUBST[c ^ l];
+      l = checksum[j] ^= MD2_PI_SUBST[c ^ l];
     }
   }
-  pthread_exit(&arg->checksum);
+  pthread_exit(checksum);
 }
 
 // unused!
 void md2_checksum_3(size_t _, uint8_t* __) {}
 
 void md2_hash_3(size_t len, const uint8_t buf[len], uint8_t out[16]) {
-  // === step 1 ===
   int paddingNeeded = 16 - (len % 16);
   uint8_t originalPadding = paddingNeeded;
   len += paddingNeeded;
@@ -93,57 +94,35 @@ void md2_hash_3(size_t len, const uint8_t buf[len], uint8_t out[16]) {
     paddingNeeded--;
   }
 
-  // === step 3 ===
-  uint8_t* messageDigestBuf = calloc(48, sizeof(uint8_t));
-  if (messageDigestBuf == NULL) {
-    return;
-  }
-
-  // === step 4 ===
-  uint8_t* checksum = calloc(16, sizeof(uint8_t));
-  if (checksum == NULL) {
-    return;
-  }
-
   pthread_t thread_1, thread_2;
 
-  struct arg_hash arg_1 = {len, newBuf, messageDigestBuf};
-  struct arg_checksum arg_2 = {len, newBuf, checksum};
+  struct thread_args thread_args = {len, newBuf};
 
-  if (pthread_create(&thread_1, NULL, process_hash, (void*)&arg_1) != 0) {
+  if (pthread_create(&thread_1, NULL, process_hash, (void*)&thread_args) != 0) {
     printf("Error creating thread 1\n");
     exit(EXIT_FAILURE);
   }
-  if (pthread_create(&thread_2, NULL, process_checksum, (void*)&arg_2) != 0) {
+  if (pthread_create(&thread_2, NULL, process_checksum, (void*)&thread_args) !=
+      0) {
     printf("Error creating thread 2\n");
     exit(EXIT_FAILURE);
   }
 
-  if (pthread_join(thread_1, NULL) != 0) {
+  u_int8_t* messageDigestBuf;
+  u_int8_t* checksum;
+
+  if (pthread_join(thread_1, (void**)&messageDigestBuf) != 0) {
     printf("Error joining thread 1\n");
     exit(EXIT_FAILURE);
   }
-  if (pthread_join(thread_2, NULL) != 0) {
+  if (pthread_join(thread_2, (void**)&checksum) != 0) {
     printf("Error joining thread 2\n");
     exit(EXIT_FAILURE);
   }
 
-  md2_print_buf(48, arg_1.messageDigestBuf);
-  // md2_print_buf(16, checksum);
+  process_nothread_hash(16, checksum, messageDigestBuf);
+  memcpy(out, messageDigestBuf, 16);
 
-  // struct arg_hash arg_last = {16, checksum, messageDigestBuf};
-
-  process_nothread_hash(16, arg_2.checksum, arg_1.messageDigestBuf);
-  // md2_print_buf(16, messageDigestBuf);
-  memcpy(out, arg_1.messageDigestBuf, 16);
-
-  // free(data);
   free(messageDigestBuf);
   free(checksum);
-
-  // process_block_checksum(data, checksum, &l);
-  // process_block_hash(data, messageDigestBuf);
-
-  // process_block_checksum(data, checksum, &l);
-  // process_block_hash(data, messageDigestBuf);
 }

From 94a4e5332a68b079a63932229fc3e1774ffaf498 Mon Sep 17 00:00:00 2001
From: Thomas Florian <thomas.florian@tum.de>
Date: Tue, 19 Jul 2022 23:12:04 +0200
Subject: [PATCH 08/16] docs: update comment of V3

---
 Implementierung/lib/md2_impls/md2_3.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/Implementierung/lib/md2_impls/md2_3.h b/Implementierung/lib/md2_impls/md2_3.h
index 8d1ff1f..0f3671e 100644
--- a/Implementierung/lib/md2_impls/md2_3.h
+++ b/Implementierung/lib/md2_impls/md2_3.h
@@ -9,13 +9,13 @@
 #include <string.h>
 #include <sys/types.h>
 #include <sys/wait.h>
-#include <unistd.h>q
+#include <unistd.h>
 
 /**
- * @brief This implementation loads the file in bits and not at once
+ * @brief Diese Implementierung benutzt Threads zum Berechnen des Hashs
  *
- * @param _ unused
- * @param filename name of the file to load
+ * @param len
+ * @param buf
  * @param out
  */
 void md2_hash_3(size_t len, const uint8_t buf[len], uint8_t out[16]);

From e516595eb288daadd597f8e7f03f3694d01ce636 Mon Sep 17 00:00:00 2001
From: finn <ge95rid@mytum.de>
Date: Wed, 20 Jul 2022 09:21:48 +0200
Subject: [PATCH 09/16] feat: return nullchecks updated

---
 Implementierung/src/io.c              | 2 +-
 Implementierung/src/md2_impls/md2_0.c | 4 ++--
 Implementierung/src/md2_impls/md2_1.c | 4 ++--
 Implementierung/src/md2_impls/md2_2.c | 6 +++---
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/Implementierung/src/io.c b/Implementierung/src/io.c
index 048aee7..942f235 100644
--- a/Implementierung/src/io.c
+++ b/Implementierung/src/io.c
@@ -36,7 +36,7 @@ uint8_t* read_file(const char* path, size_t* size) {
   uint8_t* data = malloc(statOfFile.st_size);
   if (data == NULL) {
     printf("Failure: malloc returns NULL");
-    return -1;
+    return EXIT_FAILURE;
   }
 
   size_t bytesRead =
diff --git a/Implementierung/src/md2_impls/md2_0.c b/Implementierung/src/md2_impls/md2_0.c
index c344325..941b352 100644
--- a/Implementierung/src/md2_impls/md2_0.c
+++ b/Implementierung/src/md2_impls/md2_0.c
@@ -27,7 +27,7 @@ void md2_hash_0(size_t len, const uint8_t buf[len], uint8_t out[16]) {
   uint8_t* newBuf = calloc(len + 16, sizeof(uint8_t));
   if (newBuf == NULL) {
     printf("Failure: calloc returns NULL");
-    return -1;
+    return EXIT_FAILURE;
   }
   memcpy(newBuf, buf, len - paddingNeeded);
 
@@ -50,7 +50,7 @@ void md2_hash_0(size_t len, const uint8_t buf[len], uint8_t out[16]) {
   uint8_t* messageDigestBuf = calloc(48, sizeof(uint8_t));
   if (messageDigestBuf == NULL) {
     printf("Failure: calloc returns NULL");
-    return -1;
+    return EXIT_FAILURE;
   }
 
 
diff --git a/Implementierung/src/md2_impls/md2_1.c b/Implementierung/src/md2_impls/md2_1.c
index ff2f1ff..d4fb80b 100644
--- a/Implementierung/src/md2_impls/md2_1.c
+++ b/Implementierung/src/md2_impls/md2_1.c
@@ -48,7 +48,7 @@ void md2_hash_1(size_t len, const uint8_t buf[len], uint8_t out[16])
   uint8_t* newBuf = aligned_alloc(16, sizeof(uint8_t)*(len + 16));
   if (newBuf == NULL) {
     printf("Failure: aligned_alloc returns NULL");
-    return -1;
+    return EXIT_FAILURE;
   }
 
   for(size_t i = 0; i < 16; i++) {
@@ -66,7 +66,7 @@ void md2_hash_1(size_t len, const uint8_t buf[len], uint8_t out[16])
   uint8_t *messageDigestBuf = aligned_alloc(16, sizeof(uint8_t) * 48);
   if (messageDigestBuf == NULL) {
     printf("Failure: aligned_alloc returns NULL");
-    return -1;
+    return EXIT_FAILURE;
   }
 
   for (size_t i = 0; i < 48; i++) {
diff --git a/Implementierung/src/md2_impls/md2_2.c b/Implementierung/src/md2_impls/md2_2.c
index b0955ba..5253ce7 100644
--- a/Implementierung/src/md2_impls/md2_2.c
+++ b/Implementierung/src/md2_impls/md2_2.c
@@ -52,7 +52,7 @@ void md2_hash_2(size_t len, const uint8_t buf[len], uint8_t out[16]) {
   uint8_t* messageDigestBuf = calloc(48, sizeof(uint8_t));
   if (messageDigestBuf == NULL) {
     printf("Failure: calloc returns NULL");
-    return -1;
+    return EXIT_FAILURE;
   }
 
   // === step 4 ===
@@ -60,13 +60,13 @@ void md2_hash_2(size_t len, const uint8_t buf[len], uint8_t out[16]) {
   uint8_t* checksum = calloc(16, sizeof(uint8_t));
   if (checksum == NULL) {
     printf("Failure: calloc returns NULL");
-    return -1;
+    return EXIT_FAILURE;
   }
 
   uint8_t* data = malloc(16);
   if (data == NULL) {
     printf("Failure: malloc returns NULL");
-    return -1;
+    return EXIT_FAILURE;
   }
   size_t bytes_left_to_read = file_stat.st_size;
   size_t bytes_left_to_process = 0;

From 74746a91b4e8a305dd2c68bba0ff2db79ce1052e Mon Sep 17 00:00:00 2001
From: Thomas Florian <thomas.florian@tum.de>
Date: Wed, 20 Jul 2022 10:36:19 +0200
Subject: [PATCH 10/16] fix: console warnings

---
 Implementierung/lib/md2_impls/md2_2.h      |  1 -
 Implementierung/lib/md2_impls/md2_3.h      |  2 --
 Implementierung/lib/md2_impls/md2_common.h |  1 +
 Implementierung/src/main.c                 |  1 -
 Implementierung/src/md2.c                  |  4 +--
 Implementierung/src/md2_impls/md2_2.c      |  7 ++--
 Implementierung/src/md2_impls/md2_3.c      | 38 +++++++---------------
 7 files changed, 17 insertions(+), 37 deletions(-)

diff --git a/Implementierung/lib/md2_impls/md2_2.h b/Implementierung/lib/md2_impls/md2_2.h
index 4e64689..d7b370d 100644
--- a/Implementierung/lib/md2_impls/md2_2.h
+++ b/Implementierung/lib/md2_impls/md2_2.h
@@ -18,6 +18,5 @@
  * @param out
  */
 void md2_hash_2(size_t len, const uint8_t buf[len], uint8_t out[16]);
-void md2_checksum_2(size_t len, uint8_t* buf);
 
 #endif  // MD2_2_H
\ No newline at end of file
diff --git a/Implementierung/lib/md2_impls/md2_3.h b/Implementierung/lib/md2_impls/md2_3.h
index 0f3671e..e51c783 100644
--- a/Implementierung/lib/md2_impls/md2_3.h
+++ b/Implementierung/lib/md2_impls/md2_3.h
@@ -8,7 +8,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>
-#include <sys/wait.h>
 #include <unistd.h>
 
 /**
@@ -19,6 +18,5 @@
  * @param out
  */
 void md2_hash_3(size_t len, const uint8_t buf[len], uint8_t out[16]);
-void md2_checksum_3(size_t len, uint8_t* buf);
 
 #endif  // MD2_3_H
\ No newline at end of file
diff --git a/Implementierung/lib/md2_impls/md2_common.h b/Implementierung/lib/md2_impls/md2_common.h
index f2b72c2..c66e756 100644
--- a/Implementierung/lib/md2_impls/md2_common.h
+++ b/Implementierung/lib/md2_impls/md2_common.h
@@ -1,6 +1,7 @@
 #ifndef MD2_COMMON_H
 #define MD2_COMMON_H
 
+#include <errno.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
diff --git a/Implementierung/src/main.c b/Implementierung/src/main.c
index 42b8e6f..94b7a7a 100644
--- a/Implementierung/src/main.c
+++ b/Implementierung/src/main.c
@@ -4,7 +4,6 @@
 #include "../lib/io.h"
 #include "../lib/md2.h"
 
-// Returns true when val is approx. equal to exp.
 static bool runTest(struct configuration* c, const char* message,
                     const char* expectedHash) {
   uint8_t out[16];
diff --git a/Implementierung/src/md2.c b/Implementierung/src/md2.c
index c4c50da..9cd83ed 100644
--- a/Implementierung/src/md2.c
+++ b/Implementierung/src/md2.c
@@ -26,12 +26,12 @@ bool md2_choose_implementation(int i) {
 
     case 2:
       md2_hash = md2_hash_2;
-      md2_checksum = md2_checksum_2;
+      md2_checksum = NULL;
       return true;
 
     case 3:
       md2_hash = md2_hash_3;
-      md2_checksum = md2_checksum_3;
+      md2_checksum = NULL;
       return true;
 
     default:
diff --git a/Implementierung/src/md2_impls/md2_2.c b/Implementierung/src/md2_impls/md2_2.c
index 7f361fe..1376bf4 100644
--- a/Implementierung/src/md2_impls/md2_2.c
+++ b/Implementierung/src/md2_impls/md2_2.c
@@ -38,9 +38,6 @@ void apply_padding(size_t len, uint8_t buf[16]) {
   }
 }
 
-// unused!
-void md2_checksum_2(size_t _, uint8_t* __) {}
-
 void md2_hash_2(size_t len, const uint8_t buf[len], uint8_t out[16]) {
   FILE* file;
   struct stat file_stat;
@@ -62,8 +59,8 @@ void md2_hash_2(size_t len, const uint8_t buf[len], uint8_t out[16]) {
   while (bytes_left_to_read != 0) {
     bytes_left_to_process = bytes_left_to_read >= 16 ? 16 : bytes_left_to_read;
 
-    fread(data, 1, bytes_left_to_process, file);
-    if (ferror(file) || feof(file)) {
+    size_t size = fread(data, 1, bytes_left_to_process, file);
+    if (size == 0 || ferror(file) || feof(file)) {
       if (errno == 0) errno = EIO;
       return;
     }
diff --git a/Implementierung/src/md2_impls/md2_3.c b/Implementierung/src/md2_impls/md2_3.c
index c8334be..63aebad 100644
--- a/Implementierung/src/md2_impls/md2_3.c
+++ b/Implementierung/src/md2_impls/md2_3.c
@@ -7,7 +7,7 @@ struct thread_args {
   const uint8_t* buf;
 };
 
-void process_nothread_hash(size_t len, uint8_t buf[len],
+void process_nothread_hash(size_t len, const uint8_t buf[len],
                            uint8_t messageDigestBuf[48]) {
   for (size_t i = 0; i < (len + 16) / 16 - 1; i++) {
     for (int j = 0; j < 16; j++) {
@@ -32,25 +32,10 @@ void* process_hash(void* threadArgs) {
 
   uint8_t* messageDigestBuf = calloc(48, sizeof(uint8_t));
   if (messageDigestBuf == NULL) {
-    return;
+    return NULL;
   }
 
-  for (size_t i = 0; i < (args->len + 16) / 16 - 1; i++) {
-    for (int j = 0; j < 16; j++) {
-      messageDigestBuf[16 + j] = args->buf[i * 16 + j];
-      messageDigestBuf[32 + j] =
-          (messageDigestBuf[16 + j] ^ messageDigestBuf[j]);
-    }
-
-    u_int8_t t = 0;
-
-    for (int j = 0; j < 18; j++) {
-      for (int k = 0; k < 48; k++) {
-        t = messageDigestBuf[k] = messageDigestBuf[k] ^ MD2_PI_SUBST[t];
-      }
-      t = (t + j) % 256;
-    }
-  }
+  process_nothread_hash(args->len, args->buf, messageDigestBuf);
   pthread_exit(messageDigestBuf);
 }
 
@@ -59,7 +44,7 @@ void* process_checksum(void* threasdArgs) {
 
   uint8_t* checksum = calloc(16, sizeof(uint8_t));
   if (checksum == NULL) {
-    return;
+    return NULL;
   }
 
   uint8_t l = 0;
@@ -74,9 +59,6 @@ void* process_checksum(void* threasdArgs) {
   pthread_exit(checksum);
 }
 
-// unused!
-void md2_checksum_3(size_t _, uint8_t* __) {}
-
 void md2_hash_3(size_t len, const uint8_t buf[len], uint8_t out[16]) {
   int paddingNeeded = 16 - (len % 16);
   uint8_t originalPadding = paddingNeeded;
@@ -100,12 +82,14 @@ void md2_hash_3(size_t len, const uint8_t buf[len], uint8_t out[16]) {
 
   if (pthread_create(&thread_1, NULL, process_hash, (void*)&thread_args) != 0) {
     printf("Error creating thread 1\n");
-    exit(EXIT_FAILURE);
+    if (errno == 0) errno = EAGAIN;
+    return;
   }
   if (pthread_create(&thread_2, NULL, process_checksum, (void*)&thread_args) !=
       0) {
     printf("Error creating thread 2\n");
-    exit(EXIT_FAILURE);
+    if (errno == 0) errno = EAGAIN;
+    return;
   }
 
   u_int8_t* messageDigestBuf;
@@ -113,11 +97,13 @@ void md2_hash_3(size_t len, const uint8_t buf[len], uint8_t out[16]) {
 
   if (pthread_join(thread_1, (void**)&messageDigestBuf) != 0) {
     printf("Error joining thread 1\n");
-    exit(EXIT_FAILURE);
+    if (errno == 0) errno = EINVAL;
+    return;
   }
   if (pthread_join(thread_2, (void**)&checksum) != 0) {
     printf("Error joining thread 2\n");
-    exit(EXIT_FAILURE);
+    if (errno == 0) errno = EINVAL;
+    return;
   }
 
   process_nothread_hash(16, checksum, messageDigestBuf);

From cdaa1e0196b1025b526bea061cf6217ff280bb99 Mon Sep 17 00:00:00 2001
From: Dorian Zedler <dorian@itsblue.de>
Date: Wed, 20 Jul 2022 11:21:13 +0200
Subject: [PATCH 11/16] Feat: Benchmarks

---
 Implementierung/.gitignore     |  2 +-
 Implementierung/Makefile       | 38 +++++++++++++++++++++++++++++++---
 Implementierung/benchmarks.csv |  1 +
 3 files changed, 37 insertions(+), 4 deletions(-)
 create mode 100644 Implementierung/benchmarks.csv

diff --git a/Implementierung/.gitignore b/Implementierung/.gitignore
index d6dce6b..37e27d3 100644
--- a/Implementierung/.gitignore
+++ b/Implementierung/.gitignore
@@ -1,3 +1,3 @@
 build
 md2
-testfile*
\ No newline at end of file
+t
\ No newline at end of file
diff --git a/Implementierung/Makefile b/Implementierung/Makefile
index 843d95b..7be2eba 100644
--- a/Implementierung/Makefile
+++ b/Implementierung/Makefile
@@ -5,6 +5,8 @@ OBJ = ${subst src,build,${SRC:.c=.o}}
 CC = gcc
 CFLAGS = -Ilib -ggdb -std=c11 -g -Wall -Wextra -no-pie -O3
 LDFLAGS = 
+TESTFILES = t/1 t/10 t/100 #t/1000 t/2000 t/5000 t/10000
+TESTFILES_SIZES = ${subst t/,,${TESTFILES}}
 
 all: md2
 
@@ -18,9 +20,7 @@ help:
 	@echo - all: build everything
 	@echo - clean: clean distfiles
 	@echo - help: show this help
-
-build:
-	mkdir build
+	@echo - benchmarks: run benchmarks (only works on linux!)
 
 build/%.o: src/%.c
 	@mkdir -p build/md2_impls
@@ -29,4 +29,36 @@ build/%.o: src/%.c
 md2: ${OBJ} 
 	${CC} -o $@ $(OBJ) ${LDFLAGS}
 
+t/%:
+	@echo
+	@echo "=== Generating ${subst t/,,$@}MB of random data... ==="
+	dd if=/dev/random of=$@ bs=1M count=${subst t/,,$@} status=progress
+	@echo "===                done                     ==="
+	@echo
+
+benchmarks.csv: ${TESTFILES}
+	@echo "" > $@
+	@for i in 0 1 2 3; do \
+		echo ;\
+		echo "=== Testing implementation $$i ===";\
+		for t in $(TESTFILES_SIZES); do \
+			echo -n "- with $${t}MB ... "; \
+			if ! r=$$(./md2 t/$${t} -B1 -V1); then \
+				echo; \
+				echo "ERROR!"; \
+				exit 1; \
+			fi; \
+			r=$$(echo $$r | grep "cycles took" | sed 's/ seconds//g' | sed 's/took /\n/g' | tail -1) \
+			echo $$?; \
+			echo "$${r}s"; \
+			echo "$${i};$${t};$${r}" >> $@; \
+		done; \
+		echo "===           done           ===";\
+		echo;\
+    done
+	
+
+tests: md2 
+
+
 .PHONY: all clean help
\ No newline at end of file
diff --git a/Implementierung/benchmarks.csv b/Implementierung/benchmarks.csv
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/Implementierung/benchmarks.csv
@@ -0,0 +1 @@
+

From 558f5092818cf2e1d76f7b159234263fe8e794fa Mon Sep 17 00:00:00 2001
From: finn <ge95rid@mytum.de>
Date: Wed, 20 Jul 2022 12:11:16 +0200
Subject: [PATCH 12/16] feat: nullchecks updated

---
 Implementierung/src/io.c              | 3 +--
 Implementierung/src/main.c            | 1 +
 Implementierung/src/md2_impls/md2_0.c | 6 ++----
 Implementierung/src/md2_impls/md2_1.c | 6 ++----
 Implementierung/src/md2_impls/md2_2.c | 3 +--
 5 files changed, 7 insertions(+), 12 deletions(-)

diff --git a/Implementierung/src/io.c b/Implementierung/src/io.c
index 942f235..3dbc7ff 100644
--- a/Implementierung/src/io.c
+++ b/Implementierung/src/io.c
@@ -35,8 +35,7 @@ uint8_t* read_file(const char* path, size_t* size) {
 
   uint8_t* data = malloc(statOfFile.st_size);
   if (data == NULL) {
-    printf("Failure: malloc returns NULL");
-    return EXIT_FAILURE;
+    return;
   }
 
   size_t bytesRead =
diff --git a/Implementierung/src/main.c b/Implementierung/src/main.c
index 42b8e6f..f4e5fc8 100644
--- a/Implementierung/src/main.c
+++ b/Implementierung/src/main.c
@@ -1,4 +1,5 @@
 #include <stdbool.h>
+#include <sys/resource.h>
 
 #include "../lib/helper.h"
 #include "../lib/io.h"
diff --git a/Implementierung/src/md2_impls/md2_0.c b/Implementierung/src/md2_impls/md2_0.c
index 941b352..93b7dee 100644
--- a/Implementierung/src/md2_impls/md2_0.c
+++ b/Implementierung/src/md2_impls/md2_0.c
@@ -26,8 +26,7 @@ void md2_hash_0(size_t len, const uint8_t buf[len], uint8_t out[16]) {
   // +16 for the checksum
   uint8_t* newBuf = calloc(len + 16, sizeof(uint8_t));
   if (newBuf == NULL) {
-    printf("Failure: calloc returns NULL");
-    return EXIT_FAILURE;
+    return;
   }
   memcpy(newBuf, buf, len - paddingNeeded);
 
@@ -49,8 +48,7 @@ void md2_hash_0(size_t len, const uint8_t buf[len], uint8_t out[16]) {
   // === step 3 ===
   uint8_t* messageDigestBuf = calloc(48, sizeof(uint8_t));
   if (messageDigestBuf == NULL) {
-    printf("Failure: calloc returns NULL");
-    return EXIT_FAILURE;
+    return;
   }
 
 
diff --git a/Implementierung/src/md2_impls/md2_1.c b/Implementierung/src/md2_impls/md2_1.c
index d4fb80b..ac1d867 100644
--- a/Implementierung/src/md2_impls/md2_1.c
+++ b/Implementierung/src/md2_impls/md2_1.c
@@ -47,8 +47,7 @@ void md2_hash_1(size_t len, const uint8_t buf[len], uint8_t out[16])
 
   uint8_t* newBuf = aligned_alloc(16, sizeof(uint8_t)*(len + 16));
   if (newBuf == NULL) {
-    printf("Failure: aligned_alloc returns NULL");
-    return EXIT_FAILURE;
+    return;
   }
 
   for(size_t i = 0; i < 16; i++) {
@@ -65,8 +64,7 @@ void md2_hash_1(size_t len, const uint8_t buf[len], uint8_t out[16])
   // === step 3 ===
   uint8_t *messageDigestBuf = aligned_alloc(16, sizeof(uint8_t) * 48);
   if (messageDigestBuf == NULL) {
-    printf("Failure: aligned_alloc returns NULL");
-    return EXIT_FAILURE;
+    return;
   }
 
   for (size_t i = 0; i < 48; i++) {
diff --git a/Implementierung/src/md2_impls/md2_2.c b/Implementierung/src/md2_impls/md2_2.c
index 5253ce7..279af73 100644
--- a/Implementierung/src/md2_impls/md2_2.c
+++ b/Implementierung/src/md2_impls/md2_2.c
@@ -51,8 +51,7 @@ void md2_hash_2(size_t len, const uint8_t buf[len], uint8_t out[16]) {
   // === step 3 ===
   uint8_t* messageDigestBuf = calloc(48, sizeof(uint8_t));
   if (messageDigestBuf == NULL) {
-    printf("Failure: calloc returns NULL");
-    return EXIT_FAILURE;
+    return;
   }
 
   // === step 4 ===

From c28c2d16d00488afb434d31e77debb2698292e46 Mon Sep 17 00:00:00 2001
From: finn <ge95rid@mytum.de>
Date: Wed, 20 Jul 2022 12:16:01 +0200
Subject: [PATCH 13/16] feat: md2_2 nullcheck updated

---
 Implementierung/src/md2_impls/md2_2.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/Implementierung/src/md2_impls/md2_2.c b/Implementierung/src/md2_impls/md2_2.c
index 279af73..90fd232 100644
--- a/Implementierung/src/md2_impls/md2_2.c
+++ b/Implementierung/src/md2_impls/md2_2.c
@@ -58,14 +58,12 @@ void md2_hash_2(size_t len, const uint8_t buf[len], uint8_t out[16]) {
   uint8_t l = 0;
   uint8_t* checksum = calloc(16, sizeof(uint8_t));
   if (checksum == NULL) {
-    printf("Failure: calloc returns NULL");
-    return EXIT_FAILURE;
+    return;
   }
 
   uint8_t* data = malloc(16);
   if (data == NULL) {
-    printf("Failure: malloc returns NULL");
-    return EXIT_FAILURE;
+    return;
   }
   size_t bytes_left_to_read = file_stat.st_size;
   size_t bytes_left_to_process = 0;

From 81bcf3ea87f0af992a7cdcc6078db0777487e4b8 Mon Sep 17 00:00:00 2001
From: Dorian Zedler <dorian@itsblue.de>
Date: Wed, 20 Jul 2022 12:19:58 +0200
Subject: [PATCH 14/16] Fix: makefile benachmarks

---
 Implementierung/Makefile | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/Implementierung/Makefile b/Implementierung/Makefile
index 465c11a..07a4b2b 100644
--- a/Implementierung/Makefile
+++ b/Implementierung/Makefile
@@ -5,7 +5,7 @@ OBJ = ${subst src,build,${SRC:.c=.o}}
 CC = gcc
 CFLAGS = -Ilib -ggdb -std=c11 -g -Wall -Wextra -no-pie -O3 
 LDFLAGS = -pthread
-TESTFILES = t/1 t/10 t/100 #t/1000 t/2000 t/5000 t/10000
+TESTFILES = t/10000 t/1 t/10 t/100 t/1000 #t/2000 t/5000 t/10000
 TESTFILES_SIZES = ${subst t/,,${TESTFILES}}
 
 all: md2
@@ -36,20 +36,19 @@ t/%:
 	@echo "===                done                     ==="
 	@echo
 
-benchmarks.csv: ${TESTFILES}
-	@echo "" > $@
+benchmarks.csv: md2 ${TESTFILES}
+	@rm -f $@
 	@for i in 0 2 3; do \
 		echo ;\
 		echo "=== Testing implementation $$i ===";\
 		for t in $(TESTFILES_SIZES); do \
 			echo -n "- with $${t}MB ... "; \
-			if ! r=$$(./md2 t/$${t} -B1 -V1); then \
+			if ! rr=$$(./md2 t/$${t} -B1 -V$${i}); then \
 				echo; \
 				echo "ERROR!"; \
 				exit 1; \
 			fi; \
-			r=$$(echo $$r | grep "cycles took" | sed 's/ seconds//g' | sed 's/took /\n/g' | tail -1) \
-			echo $$?; \
+			r=$$(echo $$rr | xargs | sed -e 's/.*took \(.*\) seconds.*/\1/'); \
 			echo "$${r}s"; \
 			echo "$${i};$${t};$${r}" >> $@; \
 		done; \
@@ -57,8 +56,6 @@ benchmarks.csv: ${TESTFILES}
 		echo;\
     done
 	
+benchmarks: benchmarks.csv
 
-tests: md2 
-
-
-.PHONY: all clean help
\ No newline at end of file
+.PHONY: all clean help benchmarks
\ No newline at end of file

From ace85e64a0988a6cad97742af35cd65babd63d5b Mon Sep 17 00:00:00 2001
From: Dorian Zedler <dorian@itsblue.de>
Date: Wed, 20 Jul 2022 12:22:43 +0200
Subject: [PATCH 15/16] Fix: make sure there is enough ram available

---
 Implementierung/benchmarks.csv |  1 -
 Implementierung/lib/io.h       |  1 +
 Implementierung/src/io.c       | 11 +++++++++++
 Implementierung/src/main.c     |  4 +++-
 4 files changed, 15 insertions(+), 2 deletions(-)
 delete mode 100644 Implementierung/benchmarks.csv

diff --git a/Implementierung/benchmarks.csv b/Implementierung/benchmarks.csv
deleted file mode 100644
index 8b13789..0000000
--- a/Implementierung/benchmarks.csv
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/Implementierung/lib/io.h b/Implementierung/lib/io.h
index 6887f25..532b58c 100644
--- a/Implementierung/lib/io.h
+++ b/Implementierung/lib/io.h
@@ -9,6 +9,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/stat.h>
+#include <sys/sysinfo.h>
 
 /**
  * @brief Open a file and load its stats
diff --git a/Implementierung/src/io.c b/Implementierung/src/io.c
index 339bd75..857a996 100644
--- a/Implementierung/src/io.c
+++ b/Implementierung/src/io.c
@@ -33,7 +33,18 @@ uint8_t* read_file(const char* path, size_t* size) {
     return NULL;
   }
 
+  struct sysinfo info;
+  int r = sysinfo(&info);
+  if (r != 0 || info.freeram < (unsigned long)statOfFile.st_size * 2) {
+    errno = ENOMEM;
+    return NULL;
+  }
+
   uint8_t* data = malloc(statOfFile.st_size);
+  if (data == NULL) {
+    fclose(f);
+    return NULL;
+  }
 
   size_t bytesRead =
       fread(data, statOfFile.st_blksize, statOfFile.st_blocks, f);
diff --git a/Implementierung/src/main.c b/Implementierung/src/main.c
index 94b7a7a..5e8a951 100644
--- a/Implementierung/src/main.c
+++ b/Implementierung/src/main.c
@@ -138,8 +138,10 @@ int main(int argc, char** argv) {
   char hash[32];
   if (!calculate_hash(c, hash)) {
     if (errno != 0) {
-      fprintf(stderr, "\n\033[0;31mAn error occured: %s\033[0m\n",
+      fprintf(stderr, "\n\033[1;31mAn error occured: %s\033[0m\n",
               strerror(errno));
+      if (errno == ENOMEM)
+        fprintf(stderr, "\033[1;36mPlease try to use -V2!\033[0m\n");
     }
     return EXIT_FAILURE;
   }

From 186ea1f272dc30270bf55fea4b3f1fa32cf18910 Mon Sep 17 00:00:00 2001
From: Dorian Zedler <dorian@itsblue.de>
Date: Wed, 20 Jul 2022 12:35:46 +0200
Subject: [PATCH 16/16] Fix: skip on errors

---
 Implementierung/Makefile | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/Implementierung/Makefile b/Implementierung/Makefile
index 66d8453..a418eb1 100644
--- a/Implementierung/Makefile
+++ b/Implementierung/Makefile
@@ -38,19 +38,20 @@ t/%:
 
 benchmarks.csv: md2 ${TESTFILES}
 	@rm -f $@
-	@for i in 0 2 3; do \
+	@for i in 0 1 2 3; do \
 		echo ;\
 		echo "=== Testing implementation $$i ===";\
 		for t in $(TESTFILES_SIZES); do \
 			echo -n "- with $${t}MB ... "; \
 			if ! rr=$$(./md2 t/$${t} -B1 -V$${i}); then \
 				echo; \
-				echo "ERROR!"; \
-				exit 1; \
+				echo "SKIPPED!"; \
+				echo "$${i};$${t};0" >> $@; \
+			else \
+				r=$$(echo $$rr | xargs | sed -e 's/.*took \(.*\) seconds.*/\1/'); \
+				echo "$${r}s"; \
+				echo "$${i};$${t};$${r}" >> $@; \
 			fi; \
-			r=$$(echo $$rr | xargs | sed -e 's/.*took \(.*\) seconds.*/\1/'); \
-			echo "$${r}s"; \
-			echo "$${i};$${t};$${r}" >> $@; \
 		done; \
 		echo "===           done           ===";\
 		echo;\