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2/Smoak1/README

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+Welcome to smoak1!
+-----
+In this challenge, the flag is not directly in the binary, but there is a service running on 31334.
+If you give the right responses, it will show you the flag.
+To test if you know the algorithm or are just a very good guesser, we implemented two cycles for the check.
+
+You can reach the flagservice with
+  nc localhost 31334
+
+The flag is also the password for smoak2.
+
+
+Hints
+-----
+Some things are the same all the time and are worth looking for on the internet.

2/Smoak1/test.c

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+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <time.h>
+
+uint64_t generate_challenge(){
+    time_t tVar1;
+    long challenge;
+    uint8_t rnds [9];
+    tVar1 = time((time_t *)0x0);
+
+    srand((uint)tVar1);
+    memset(rnds,0,9);
+    challenge = 0;
+    for (uint8_t i = 0; i < 8; i = i + 1) {
+        rnds[i] = (uint8_t)rand();
+        challenge = challenge * 0x100 + (ulong)rnds[i];
+    }
+    for(uint8_t i=0; i<sizeof(rnds); i++)
+        printf("%02X ", rnds[i]);
+    printf("\n");
+    printf("Challenge: %llX\n",challenge);
+    return challenge;
+}
+
+unsigned int FUN_001011b0(char *param_1,long param_2)
+{
+  long start;
+  char *next_char_p;
+  int i;
+  char character;
+  unsigned int mask;
+  long len;
+  char *input_char;
+  
+  mask = 0xffffffff;
+  len = param_2;
+  input_char = param_1;
+  while (start = len + -1, len != 0) {
+    next_char_p = input_char + 1;
+    character = *input_char;
+    for (i = 0; len = start, input_char = next_char_p, i < 8; i = i + 1) {
+      if ((((int)character ^ mask) & 1) == 0) {
+        mask = mask >> 1;
+      }
+      else {
+        mask = mask >> 1 ^ 0xedb88320;
+      }
+      character = character >> 1;
+    }
+  }
+  return mask ^ 0xffffffff;
+}
+
+int main(int argc, char** args){
+    //uint64_t challenge = generate_challenge();
+    uint64_t challenge = 0x84223EB2051265E3;
+
+    uint8_t rnds[9];
+    for(uint8_t i=0; i<8; i++){
+        rnds[7-i] = challenge & 0xFF;
+        challenge>>=8;
+    }
+
+    uint64_t resp = FUN_001011b0(rnds, 8);
+    printf("%ld", resp);
+}