Project 4:

Scope of Project

Reverse Engineer Assembly Code into a working C program.

Escape Room

you will pass in 6 numbers that will tell you if you entered the correct combination.

Escape_Room.c Code

``````
#include <stdio.h>

int Is_Number_Correct (int n1,int n2,int n){
int nRet=0;
if (n1 == n2){
printf ("Number %d: Correct. Nice Job.\n",n);
nRet=1;
}

else{
printf ("Number %d: Incorrect\n",n);
nRet=0;
}

return nRet;
}

int f0 (){
return 136182;
}

// Function 1: does this
int f1 (){
int nRet=0;
int n1=28069447;//4
int n2=159934;//8
int n3=131022;//c
int n4=206829;//10
if (n1 <= n2 + n3){ //comp n1-(n2+n3) less equal
if (n2 > n3)
nRet=n3 ^ n4;
else if (n2 <= n4)
nRet = n1 / n2;
else
nRet=n3 ^ n4;
}
else if (n2 != n4)
nRet = n3>>2;
else
nRet = n1 & n2;
return nRet;//32755;
}

int f2 (int n){
int nRet = 0,i=0;
while (i <= 21)
{
nRet+=i * i + n;
++i;
}
return nRet;
}

void f3 (int n,int* pn){
*pn+=8 * n;
//*pN=(int)(((LONGLONG)(0x55555556 * (*pN))) >> 32) -(*pN >> 0x1f);
*pn/=3;
}

int f4_helper (int n){
int m=2;
return m * n;
}

int f4 (int x1,int x2,int x3){
return f4_helper (x1) + f4_helper (x2) + f4_helper (x3);
}

void f5 (int *pN){
int n=0,i=0,nArray[9]={9348,3957,2849,2048,7452,9348,3957,2849,2048};
for (i=0;i <= 4;++i)
n+=nArray[i];
pN[5]=n;
}

// Main Function
int main (int argc,char** argv){
int i = 0,nCnt = 0;

int arrayA[6]={0},arrayB[6]={0};
printf ("Enter six numbers: ");
for (i=0; i <= 5; ++i)
scanf ("%d",&arrayA[i]);
printf ("\nYou have entered: %d, %d, %d, %d, %d, %d\n",arrayA[0],arrayA[1],arrayA[2],arrayA[3],arrayA[4],arrayA[5]);
arrayB[0]=f0 ();
arrayB[1]=f1 ();
arrayB[2]=f2 (i);
arrayB[3]=36566;
f3 (36566,&arrayB[3]);
arrayB[4]=f4 (783,838,983);
f5 (&arrayB[0]);
for (i=0;i <= 5;++i)
nCnt+=Is_Number_Correct (arrayA[i],arrayB[i],i);
if (!nCnt)
puts ("You didn't get any correct numbers. Please try again.");
if ((0 < nCnt) && (5 >= nCnt))
printf ("You got %d correct numbers.  Please try again.\n",nCnt);
if (6 == nCnt)
puts ("All numbers are correct! Nice work!");
return 0;
}
``````

Testing Code

``````./Escape_Room < Combination.txt
``````

Output:

``````Enter six numbers:
You have entered: 136182, 32755, 3443, 109698, 5208, 25654
Number 0: Correct. Nice Job.
Number 1: Correct. Nice Job.
Number 2: Correct. Nice Job.
Number 3: Correct. Nice Job.
Number 4: Correct. Nice Job.
Number 5: Correct. Nice Job.
All numbers are correct! Nice work!
``````