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

#include "stdafx.h"
#include <memory.h>

unsigned char Ptbl[256]={
   0x29, 0x0d, 0x61, 0x40, 0x9c, 0xeb, 0x9e, 0x8f, 0x1f, 0x85, 0x5f, 0x58, 0x5b, 0x01, 0x39, 0x86,
   0x97, 0x2e, 0xd7, 0xd6, 0x35, 0xae, 0x17, 0x16, 0x21, 0xb6, 0x69, 0x4e, 0xa5, 0x72, 0x87, 0x08,
   0x3c, 0x18, 0xe6, 0xe7, 0xfa, 0xad, 0xb8, 0x89, 0xb7, 0x00, 0xf7, 0x6f, 0x73, 0x84, 0x11, 0x63,
   0x3f, 0x96, 0x7f, 0x6e, 0xbf, 0x14, 0x9d, 0xac, 0xa4, 0x0e, 0x7e, 0xf6, 0x20, 0x4a, 0x62, 0x30,
   0x03, 0xc5, 0x4b, 0x5a, 0x46, 0xa3, 0x44, 0x65, 0x7d, 0x4d, 0x3d, 0x42, 0x79, 0x49, 0x1b, 0x5c,
   0xf5, 0x6c, 0xb5, 0x94, 0x54, 0xff, 0x56, 0x57, 0x0b, 0xf4, 0x43, 0x0c, 0x4f, 0x70, 0x6d, 0x0a, 
   0xe4, 0x02, 0x3e, 0x2f, 0xa2, 0x47, 0xe0, 0xc1, 0xd5, 0x1a, 0x95, 0xa7, 0x51, 0x53, 0x33, 0x2b,
   0x5d, 0xd4, 0x1d, 0x2c, 0xee, 0x75, 0xec, 0xdd, 0x7c, 0x4c, 0xa6, 0xb4, 0x78, 0x48, 0x3a, 0x32,
   0x98, 0xaf, 0xc0, 0xe1, 0x2d, 0x09, 0x0f, 0x1e, 0xb9, 0x27, 0x8a, 0xe9, 0xbd, 0xe3, 0x9f, 0x07,
   0xb1, 0xea, 0x92, 0x93, 0x53, 0x6a, 0x31, 0x10, 0x80, 0xf2, 0xd8, 0x9b, 0x04, 0x36, 0x06, 0x8e,
   0xbe, 0xa9, 0x64, 0x45, 0x38, 0x1c, 0x7a, 0x6b, 0xf3, 0xa1, 0xf0, 0xcd, 0x37, 0x25, 0x15, 0x81,
   0xfb, 0x90, 0xe8, 0xd9, 0x7b, 0x52, 0x19, 0x28, 0x26, 0x88, 0xfc, 0xd1, 0xe2, 0x8c, 0xa0, 0x34, 
   0x82, 0x67, 0xda, 0xcb, 0xc7, 0x41, 0xe5, 0xc4, 0xc8, 0xef, 0xdb, 0xc3, 0xcc, 0xab, 0xce, 0xed,
   0xd0, 0xbb, 0xd3, 0xd2, 0x71, 0x68, 0x13, 0x12, 0x9a, 0xb3, 0xc2, 0xca, 0xde, 0x77, 0xdc, 0xdf,
   0x66, 0x83, 0xbc, 0x8d, 0x60, 0xc6, 0x22, 0x23, 0xb2, 0x8b, 0x91, 0x05, 0x76, 0xcf, 0x74, 0xc9,
   0xaa, 0xf1, 0x99, 0xa8, 0x59, 0x50, 0x3b, 0x2a, 0xfe, 0xf9, 0x24, 0xb0, 0xba, 0xfd, 0xf8, 0x55};

#define CSC_C00 0xb7
#define CSC_C01 0xe1
#define CSC_C02 0x51
#define CSC_C03 0x62
#define CSC_C04 0x8a
#define CSC_C05 0xed
#define CSC_C06 0x2a
#define CSC_C07 0x6a

#define CSC_C10 0xbf
#define CSC_C11 0x71
#define CSC_C12 0x58
#define CSC_C13 0x80
#define CSC_C14 0x9c
#define CSC_C15 0xf4
#define CSC_C16 0xf3
#define CSC_C17 0xc7

unsigned char tx1, tx2, tx3;

typedef union CHARINT{
   unsigned char x[2];
   unsigned short a;
}charint;

charint tci1, tci2;

#define ROTL(x) x = (x << 1) ^ (x >> 7);

unsigned char phi(unsigned char x){
   tx1 = tx2 = x;
   ROTL(x);
   tx2 = x & 0xaa;
   x = tx2 ^ tx1;    
   return (x);
}

unsigned short doMless(unsigned short x){
   tci1.a = x;
   tx3 = tx1 = phi( (Ptbl[tci1.x[0]])^(Ptbl[tci1.x[1]])   );
   ROTL(tx3)
   tx2 = (  tx3 ^ Ptbl[tci1.x[1]] );
   tci1.x[0] = tx1;
   tci1.x[1] = tx2;

   return (tci1.a);
}


unsigned char k0[8] = {0x45, 0xfd, 0x13, 0x7a, 0x4e, 0xdf, 0x9e, 0xc4};
unsigned char k1[8] = {0x1d, 0xd4, 0x3f, 0x03, 0xe6, 0xf7, 0x56, 0x4c};
unsigned char k2[8] = {0xeb, 0xe2, 0x67, 0x56, 0xde, 0x99, 0x37, 0xc7};
unsigned char k3[8] = {0x96, 0x17, 0x04, 0xe9, 0x45, 0xba, 0xd4, 0xfb};
unsigned char k4[8] = {0x0b, 0x60, 0xdf, 0xe9, 0xef, 0xf4, 0x73, 0xd4};
unsigned char k5[8] = {0x76, 0xd3, 0xe7, 0xcf, 0x52, 0xc4, 0x66, 0xcf};
unsigned char k6[8] = {0x75, 0xec, 0x8c, 0xef, 0x76, 0x7d, 0x3a, 0x0d};
unsigned char k7[8] = {0x82, 0xda, 0x33, 0x37, 0xb5, 0x98, 0xfd, 0x6d};
unsigned char k8[8] = {0xfb, 0xd8, 0x20, 0xda, 0x8d, 0xc8, 0xaf, 0x8c};

//unsigned char cipher[8] = {0x88, 0xfd, 0xdf, 0xbe, 0x95, 0x44, 0x79, 0xd7};
//unsigned char cipher[8] = {0xa2, 0x24, 0x5b, 0xa3, 0x69, 0x74, 0x45, 0xd2};
unsigned char cipher[8] = {0xc3, 0xfe, 0xb9, 0x6c, 0x0c, 0xf4, 0xb6, 0x49};

int main(int argc, char* argv[])
{

   charint holder1;   
   unsigned char midciph[8];
   unsigned short x;
   printf("Starting round 1 to 0(no ecryption) decrypt\n");
   //---------------------------------------
   holder1.x[0] = cipher[0];
   holder1.x[1] = cipher[4];

   x = holder1.a;
   holder1.a = doMless( x );
   midciph[0] = holder1.x[0] ^ CSC_C10;
   midciph[1] = holder1.x[1] ^ CSC_C11;
   //---------------------------------------
   //---------------------------------------
   holder1.x[0] = cipher[1];
   holder1.x[1] = cipher[5];

   x = holder1.a;
   holder1.a = doMless( x );
   midciph[2] = holder1.x[0] ^ CSC_C12;
   midciph[3] = holder1.x[1] ^ CSC_C13;
   //---------------------------------------
   //---------------------------------------
   holder1.x[0] = cipher[2];
   holder1.x[1] = cipher[6];

   x = holder1.a;
   holder1.a = doMless( x );
   midciph[4] = holder1.x[0] ^ CSC_C14;
   midciph[5] = holder1.x[1] ^ CSC_C15;
   //---------------------------------------
   //---------------------------------------
   holder1.x[0] = cipher[3];
   holder1.x[1] = cipher[7];

   x = holder1.a;
   holder1.a = doMless( x );
   midciph[6] = holder1.x[0] ^ CSC_C16;
   midciph[7] = holder1.x[1] ^ CSC_C17;
   //---------------------------------------
   //end lower rung.. move to rung 2
   printf("%X  ", midciph[0]);
   printf("%X  ", midciph[1]);
   printf("%X  ", midciph[2]);
   printf("%X  ", midciph[3]);
   printf("%X  ", midciph[4]);
   printf("%X  ", midciph[5]);
   printf("%X  ", midciph[6]);
   printf("%X\n", midciph[7]);


   memcpy (cipher, midciph, 8);
   //---------------------------------------
   holder1.x[0] = cipher[0];
   holder1.x[1] = cipher[4];

   x = holder1.a;
   holder1.a = doMless( x );
   midciph[0] = holder1.x[0] ^ CSC_C00;
   midciph[1] = holder1.x[1] ^ CSC_C01;
   //---------------------------------------
   //---------------------------------------
   holder1.x[0] = cipher[1];
   holder1.x[1] = cipher[5];

   x = holder1.a;
   holder1.a = doMless( x );
   midciph[2] = holder1.x[0] ^ CSC_C02;
   midciph[3] = holder1.x[1] ^ CSC_C03;
   //---------------------------------------
   //---------------------------------------
   holder1.x[0] = cipher[2];
   holder1.x[1] = cipher[6];

   x = holder1.a;
   holder1.a = doMless( x );
   midciph[4] = holder1.x[0] ^ CSC_C04;
   midciph[5] = holder1.x[1] ^ CSC_C05;
   //---------------------------------------
   //---------------------------------------
   holder1.x[0] = cipher[3];
   holder1.x[1] = cipher[7];

   x = holder1.a;
   holder1.a = doMless( x );
   midciph[6] = holder1.x[0] ^ CSC_C06;
   midciph[7] = holder1.x[1] ^ CSC_C07;
   //---------------------------------------
   //end lower rung.. move to rung 3 (using the key subset instead of teh constant)
   printf("%X  ", midciph[0]);
   printf("%X  ", midciph[1]);
   printf("%X  ", midciph[2]);
   printf("%X  ", midciph[3]);
   printf("%X  ", midciph[4]);
   printf("%X  ", midciph[5]);
   printf("%X  ", midciph[6]);
   printf("%X\n", midciph[7]);

   memcpy (cipher, midciph, 8);
   //---------------------------------------
   holder1.x[0] = cipher[0];
   holder1.x[1] = cipher[4];

   x = holder1.a;
   holder1.a = doMless( x );
   midciph[0] = holder1.x[0] ^ k0[0];
   midciph[1] = holder1.x[1] ^ k0[1];
   //---------------------------------------
   //---------------------------------------
   holder1.x[0] = cipher[1];
   holder1.x[1] = cipher[5];

   x = holder1.a;
   holder1.a = doMless( x );
   midciph[2] = holder1.x[0] ^ k0[2];
   midciph[3] = holder1.x[1] ^ k0[3];
   //---------------------------------------
   //---------------------------------------
   holder1.x[0] = cipher[2];
   holder1.x[1] = cipher[6];

   x = holder1.a;
   holder1.a = doMless( x );
   midciph[4] = holder1.x[0] ^ k0[4];
   midciph[5] = holder1.x[1] ^ k0[5];
   //---------------------------------------
   //---------------------------------------
   holder1.x[0] = cipher[3];
   holder1.x[1] = cipher[7];

   x = holder1.a;
   holder1.a = doMless( x );
   midciph[6] = holder1.x[0] ^ k0[6];
   midciph[7] = holder1.x[1] ^ k0[7];
   //---------------------------------------

   printf("%X  ", midciph[0]);
   printf("%X  ", midciph[1]);
   printf("%X  ", midciph[2]);
   printf("%X  ", midciph[3]);
   printf("%X  ", midciph[4]);
   printf("%X  ", midciph[5]);
   printf("%X  ", midciph[6]);
   printf("%X\n", midciph[7]);

   
   return 0;
}