LC

// TestAppDll.cpp : Defines the entry point for the console application. 
// 

#include "stdafx.h" 

#include <time.h> 
#include <stdlib.h> 
int Sbox[16] = { 0xE, 0x3, 0x0, 0x7, 0x2, 0xC, 0xF, 0xB, 0x5, 0xA, 0x6, 0x9, 0x8, 0x1, 0x4, 0xD }; 
int InverseSbox[16] = { 0x2, 0xD, 0x4, 0x1, 0xE, 0x8, 0xA, 0x3, 0xC, 0xB, 0x9, 0x7, 0x5, 0xF, 0x0, 0x6 }; 
int guess_key[16] = { 0x0000 , 0x0001 , 0x0010 , 0x0011 , 0x0100 , 0x0101 , 0x0110 , 0x0111 , 0x1000 , 0x1001 ,0x1010 , 0x1011,0x1100 ,0x1101 ,0x1110 ,0x1111 }; 
int guess_key2[16] = { 0x0000 , 0x0002 , 0x0020 ,0x0022 ,0x0200 , 0x0202 , 0x0220 , 0x0222 , 0x2000 , 0x2002 , 0x2020 , 0x2022 , 0x2200 , 0x2202 ,0x2220 ,0x2222 }; 
int guess_key3[16] = { 0x0000 , 0x0004 , 0x0040 ,0x0044 , 0x0400 , 0x0404 ,0x0440 , 0x0444 , 0x4000 , 0x4004 ,0x4040 ,0x4044 , 0x4400 , 0x4404 ,0x4440, 0x4444 }; 
int guess_key4[16] = { 0x0000, 0x0008 , 0x0080 , 0x0088 ,0x0800 , 0x0808 ,0x0880 , 0x0888 ,0x8000 ,0x8008 , 0x8080 , 0x8088 , 0x8800 , 0x8808 , 0x8880 ,0x8888 }; 
extern "C" __declspec(dllexport) void Substitution(int* p, int* c) 
{ 
*c = (Sbox[(*p >> 12 & 0xf)] << 12) | (Sbox[(*p >> 8 & 0xf)] << 8) | (Sbox[(*p >> 4 & 0xf)] << 4) | (Sbox[(*p & 0xf)]); 
} 

extern "C" __declspec(dllexport) void Permutation(int* p, int* c) 
{ 
*c = ((*p >> 15 & 1) << 15) | ((*p >> 11 & 1) << 14) | ((*p >> 7 & 1) << 13) | ((*p >> 3 & 1) << 12) | 
((*p >> 14 & 1) << 11) | ((*p >> 10 & 1) << 10) | ((*p >> 6 & 1) << 9) | ((*p >> 2 & 1) << 8) | 
((*p >> 13 & 1) << 7) | ((*p >> 9 & 1) << 6) | ((*p >> 5 & 1) << 5) | ((*p >> 1 & 1) << 4) | 
((*p >> 12 & 1) << 3) | ((*p >> 8 & 1) << 2) | ((*p >> 4 & 1) << 1) | ((*p & 1)); 
} 

extern "C" __declspec(dllexport) void Substitution_Inverse(int* p, int* c) 
{ 
*c = (InverseSbox[(*p >> 12 & 0xf)] << 12) | (InverseSbox[(*p >> 8 & 0xf)] << 8) | 
(InverseSbox[(*p >> 4 & 0xf)] << 4) | (InverseSbox[(*p & 0xf)]); 
} 

extern "C" __declspec(dllimport) void Substitution(int* p, int* c); 
extern "C" __declspec(dllimport) void Substitution_Inverse(int* p, int* c); 
extern "C" __declspec(dllimport) void Permutation(int* p, int* c); 
extern "C" __declspec(dllimport) void Encryption(int P, int* C); 

int main(int argc, char* argv[]) 
{ 
srand(time(NULL)); 
int temp1, temp2=0, temp3, temp4; 
int Plaintext1, Ciphertext1; 
int p[16]; 
int p1, p2, p3, p4; 
int w, _w, __w, ___w; 
int t, _t , __t; 
int r, _r, __r; 
int o, _o, __o; 
int input_key[16][2] = { 0, }; 
int i = 0; 
int j; 
int a; 
int count = 0; 
int k = 0x0000; 
int Round5key = 0xaa71; 
int Round4key = 0xfaa7; 
int Round3key = 0x7faa; 
int Round2key = 0x67fa; 
int Round1key = 0x267f; 
int Round0key; 
int numofplaintext; 
int ptemp; 
printf("input the number of plaintext : "); 
scanf_s("%d", &numofplaintext); 
for (i = 0; i < 16; i++) { 
for (j = 0; j < numofplaintext; j++) { 
Plaintext1 = ((rand() * j) % 0xffff) & 0xffff; 
ptemp = Plaintext1; 
//printf("guess key :         0x%04x                    plaintext = 0x%04x\n", guess_key[i], Plaintext1); 
for (a = 0; a < 16; a++) { 
p[a] = ptemp & 0x1; 
ptemp >>= 1; 
} 
Encryption(Plaintext1, &Ciphertext1); 
//round5 
w = Ciphertext1 ^ Round5key; 
//permutation 
Substitution_Inverse(&w, &_w); 

//round4 
_w = _w ^ Round4key; 
Permutation(&_w, &__w); 
Substitution_Inverse(&__w, &t); 

//round3 
t = t ^ Round3key; 
Permutation(&t, &_t); 
Substitution_Inverse(&_t, &__t); 



//round2 	
r = __t ^ Round2key; 
Permutation(&r, &_r); 
Substitution_Inverse(&_r, &__r); 

//round1  
o = __r ^ Round1key; 
Permutation(&o, &_o); 
Substitution_Inverse(&_o, &__o); 

Round0key = Plaintext1 ^ __o; 
printf("Round0key is 0x%04x\n", Round0key); 
scanf_s("%d", &count); 
while (getchar() != '\n'); 


  
if (  p[8] ^ ((temp2)  &0x1 ) == 0) //  
{ 
input_key[i][0] = guess_key3[i]; 
input_key[i][1] += 1; 
} 

} 
if (input_key[i][1] >= (numofplaintext / 2)) 
input_key[i][1] -= (numofplaintext / 2); 
else 
input_key[i][1] = (numofplaintext / 2) - input_key[i][1]; 

} 

int max = input_key[0][0]; 
int _max = input_key[0][1]; 
int index = 0; 

for (i = 0; i < 16; i++) { 
if (_max < input_key[i][1]) 
{ 
_max = input_key[i][1]; 
index = i; 
} 
} 
for (int i = 0; i < 16; i++) { 
printf("0x%04x          :      %d\n", guess_key3[i], input_key[i][1]); 
} 
printf("key :      0x%04x\n", guess_key3[index]); 
return 0; 
}