[Hitb-xctf 2018] multicheck

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s = ''
n = 233
for c in data:
    s += chr(c ^ (n & 0xff))
    n += 1
 
with open('real_check.dex', 'wb') as f:
    f.write(s)

real_check source

package com.a;
 
import java.util.Arrays;
 
public class Check
{
  private static int[] a = { -1414812757, -842150451, -269488145, 305419896 };
  private static byte[] b = { 99, 124, 101, -23, -114, 81, -47, -39, -102, 79, 22, 52, -39, -94, -66, -72, 101, -18, 73, -27, 53, -5, 46, -20, 97, 11, -56, 36, -19, -49, -112, -75 };
  
  private static int a(byte paramByte)
  {
    int i = paramByte;
    if (paramByte < 0) {
      i = paramByte + 256;
    }
    return i;
  }
  
  public static byte[] a(byte[] paramArrayOfByte)
  {
    int i = 8 - paramArrayOfByte.length % 8;
    byte[] arrayOfByte = new byte[paramArrayOfByte.length + i];
    arrayOfByte[0] = ((byte)i);
    System.arraycopy(paramArrayOfByte, 0, arrayOfByte, i, paramArrayOfByte.length);
    paramArrayOfByte = new byte[arrayOfByte.length];
    i = 0;
    while (i < paramArrayOfByte.length)
    {
      System.arraycopy(a(arrayOfByte, i, a, 32), 0, paramArrayOfByte, i, 8);
      i += 8;
    }
    return paramArrayOfByte;
  }
  
  static byte[] a(byte[] paramArrayOfByte, int paramInt1, int[] paramArrayOfInt, int paramInt2)
  {
    paramArrayOfByte = a(paramArrayOfByte, paramInt1);
    int i = paramArrayOfByte[0];
    paramInt1 = paramArrayOfByte[1];
    int k = 0;
    int m = paramArrayOfInt[0];
    int n = paramArrayOfInt[1];
    int i1 = paramArrayOfInt[2];
    int i2 = paramArrayOfInt[3];
    int j = 0;
    while (j < paramInt2)
    {
      k -= 1640531527;
      i += ((paramInt1 << 4) + m ^ paramInt1 + k ^ (paramInt1 >> 5) + n);
      paramInt1 += ((i << 4) + i1 ^ i + k ^ (i >> 5) + i2);
      j += 1;
    }
    paramArrayOfByte[0] = i;
    paramArrayOfByte[1] = paramInt1;
    return a(paramArrayOfByte, 0);
  }
  
  private static byte[] a(int[] paramArrayOfInt, int paramInt)
  {
    byte[] arrayOfByte = new byte[paramArrayOfInt.length << 2];
    int i = 0;
    while (paramInt < arrayOfByte.length)
    {
      arrayOfByte[(paramInt + 3)] = ((byte)(paramArrayOfInt[i] & 0xFF));
      arrayOfByte[(paramInt + 2)] = ((byte)(paramArrayOfInt[i] >> 8 & 0xFF));
      arrayOfByte[(paramInt + 1)] = ((byte)(paramArrayOfInt[i] >> 16 & 0xFF));
      arrayOfByte[paramInt] = ((byte)(paramArrayOfInt[i] >> 24 & 0xFF));
      i += 1;
      paramInt += 4;
    }
    return arrayOfByte;
  }
  
  private static int[] a(byte[] paramArrayOfByte, int paramInt)
  {
    int[] arrayOfInt = new int[paramArrayOfByte.length >> 2];
    int i = 0;
    while (paramInt < paramArrayOfByte.length)
    {
      arrayOfInt[i] = (a(paramArrayOfByte[(paramInt + 3)]) | a(paramArrayOfByte[(paramInt + 2)]) << 8 | a(paramArrayOfByte[(paramInt + 1)]) << 16 | paramArrayOfByte[paramInt] << 24);
      i += 1;
      paramInt += 4;
    }
    return arrayOfInt;
  }
  
  public static boolean check(String paramString)
  {
    return Arrays.equals(a(paramString.getBytes()), b);
  }
}
 

Solve

#include <stdio.h>
#include <stdlib.h>
 
void decrypt(int* enc, int n) 
{
    int table[] = { -1414812757, -842150451, -269488145, 305419896 };
    int sum = -957401312;
    unsigned int key = 1640531527;
    for (int i = 0; i < 32; i++) {
        enc[n + 1] -= ((enc[n] << 4) + table[2]) ^ (enc[n] + sum) ^ ((enc[n] >> 5) + table[3]);
        enc[n] -= ((enc[n + 1] << 4) + table[0]) ^ (enc[n + 1] + sum) ^ ((enc[n + 1] >> 5) + table[1]);
        sum += key;
    }
}
 
int main()
{
    int enc[] = { 99, 124, 101, -23, -114, 81, -47, -39, -102, 79, 22, 52, -39, -94, -66, -72, 101, -18, 73, -27, 53, -5, 46, -20, 97, 11, -56, 36, -19, -49, -112, -75 };
    int shift[4] = { 24, 16, 8, 0 };
    int byte[32 >> 2] = { 0, };
 
    //byte_to_int
    int j = 0;
    for (int i = 0; i < 32; i += 4)
    {
        byte[j] = ((enc[i + 3] & 0xff) | ((enc[i + 2] & 0xff) << 8) | ((enc[i + 1] & 0xff) << 16) | ((enc[i] & 0xff) << 24));
        j += 1;
    }
 
    for (int i = 0; i < 8; i += 2)
        decrypt(byte, i);
 
    for (int i = 1; i < 8; i++)
    {
        for (int j = 0; j < 4; j++)
        {
            printf("%c", (byte[i] >> shift[j]) & 0xff);
        }
    }
    printf("\n");
    return 0;
}

Flag = HITB{SEe!N9_IsN'T_bELIEV1Ng}