Feat: Step1 padding

Implementierung/lib/md2.h

@@ -2,6 +2,9 @@
 #define MD2_H
 
 #include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 #include <sys/types.h>
 
 /**

Implementierung/src/main.c

@@ -20,5 +20,8 @@ int main(int argc, char** argv) {
       "benchmark cycles: %d\n",
       c.filename, c.implementationToUse, c.doBenchmark, c.benchmarkingCycles);
 
+  uint8_t out[16];
+  md2_hash(3, "abc", out);
+
   return 0;
 }

Implementierung/src/md2.c

@@ -1,8 +1,35 @@
-#include "io.h"
+#include "../lib/md2.h"
 
 // The file "testfile" should lead to this hash:
 // fc982e558db259f298b43cd4c1241c66
 
+void printBuf(size_t len, uint8_t buf[len]) {
+  for (int i = 0; i < len; i++) {
+    printf("'%lx',", buf[i]);
+  }
+  printf("\n");
+}
+
 void md2_checksum(size_t len, uint8_t* buf) {}
 
-void md2_hash(size_t len, const uint8_t buf[len], uint8_t out[16]) {}
+void md2_hash(size_t len, const uint8_t buf[len], uint8_t out[16]) {
+  // add padding
+  int paddingNeeded = 16 - (len % 16);
+  uint8_t originalPadding = paddingNeeded;
+  len += paddingNeeded;
+
+  printf("len: %d\n", len);
+
+  uint8_t* newBuf = malloc(len);
+  memcpy(newBuf, buf, len - paddingNeeded);
+  newBuf[4] = 'f';
+
+  while (paddingNeeded > 0) {
+    newBuf[len - paddingNeeded] = originalPadding;
+    paddingNeeded--;
+  }
+
+  printBuf(len, newBuf);
+
+  free(newBuf);
+}