#include <stdio.h>
#include <string.h>
#include <stdlib.h>


//Proable holes can't work any out thought
//GPL_3 3.142 linece


main() {

unsigned char bankpubkey[16] = {0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b};
unsigned char clientpubkey[16] = {0x4b,0x4a,0x49,0x48,0x47,0x46,0x45,0x44,0x43,0x42,0x41};
unsigned char mitmpubkey[16] = {0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c};

unsigned char bankrandkey[16] = {"EEEEEEEEEEE"};
unsigned char clientrandkey[16] = {"FFFFFFFFF"};	//hidden

unsigned char banknum=0;
unsigned char clientnum=0;
unsigned char bankoffset=0;
unsigned char clientoffset=0;

unsigned char banknum1=0;
unsigned char clientnum1=0;
unsigned char bankoffset1=0;
unsigned char clientoffset1=0;



unsigned int p=0,l=0,k=0,i=0;

unsigned char bankhello[100] = {"Welecome enter transaction data"};
unsigned char clienthello[100] = {"random stuff heloogsdfgjksfsdd"}; //need to be random strong

unsigned char bankinv[100];
unsigned char clientinv[100];

memset(bankinv,0x00,sizeof(bankinv));
memset(clientinv,0x00,sizeof(clientinv));



unsigned char start=0x00;

//work out hidden data
//banks side
//////////////////////////////////This is open later
start=clientpubkey[0];	//multistring search....TODO[0]
for(i=0;i<=0xff;i++) {
	start = (unsigned char)(start^i);
	if(start == bankrandkey[0]) {	//multistring search....
		banknum = (unsigned char)(i);
		goto leave;
	}
}
leave:
bankoffset = banknum^bankpubkey[0];


printf("%2X:%2X\n",banknum^bankpubkey[0],clientpubkey[0]);
printf("Bank send to client :%s:\n",bankhello);
/////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////Hidden, steps reversed for bank to check us
//client side
start=bankhello[0];	//multistring search....TODO[0]
for(i=0;i<=0xff;i++) {
	start = (unsigned char)(start^i);
	if(start == clientrandkey[0]) {	//multistring search....
		clientnum = (unsigned char)(i);
		goto leave1;
	}
}
leave1:
clientoffset = clientnum^clientpubkey[0];
for(p=0;p<strlen(bankhello);p++) {
	clienthello[p] = clienthello[p]^clientoffset;	//need to be random
}
printf("Client sends with a hiddeen data :%s:\n",clienthello);
///////////////////////////////////////////////////////////////////////////////////////////

printf("Data that is hidden and can decode string (C)%2X..(B)%2X\n",clientoffset,bankoffset);

//////////////////////////////////thoery stuff
for(p=0;p<strlen(clienthello);p++) {
	printf("%2X",(clienthello[p]^clientpubkey[p]));
}
printf("\n");
for(p=0;p<strlen(clienthello);p++) {
	printf("%2X",(clienthello[p]^bankpubkey[p]));
}
printf("\n");
for(p=0;p<strlen(clienthello);p++) {
	printf("%2X",clienthello[p]);
}
printf("\n");
/////////////////////////////////////////////////////////////////////////////////////
printf("One side takes the first step say bank\n");
printf("Client your refence number is ref:%s: and this is what we recvied from you\n",bankrandkey);
printf(":%s:\n",clienthello);
printf("Client does what the bank did to find there hidden(saying) number\n");
/*
start=clientpubkey[0];	//multistring search....TODO[0]
for(i=0;i<=0xff;i++) {
	start = (unsigned char)(start^i);
	if(start == bankrandkey[0]) {	//multistring search....
		banknum = (unsigned char)(i);
		goto leave;
	}
}
leave:
bankoffset = banknum^bankpubkey[0];
*/
//////////////////////////////////This is open for anyone to see and workout
start=clienthello[0];	//multistring search....TODO[0]
for(i=0;i<=0xff;i++) {
	start = (unsigned char)(start^i);
	if(start == bankoffset) {	//multistring search....
		clientnum1 = (unsigned char)(i);
		goto leave2;
	}
}
leave2:
clientoffset1 = bankoffset^clientnum1;
///////////////////////////////////////////////////////////////////
//hidden down on client
printf("Data :%2X,%2X::%2X,%2X:\n",clientnum,clientoffset,clientnum1,clientoffset1);
printf("Client works out match :%2X^%2X = %2X\n",(bankoffset^clientoffset),clientoffset,clientoffset^(bankoffset^clientoffset));

printf("Client works out to see if mitm changed data to bank, it should fall if\n");
printf("banks randomkey is different or they tryed to modify clienthello string\n");
printf("or if the public keys (B)&(C) don't match\n");

for(p=0;p<strlen(clienthello);p++) {
	clienthello[p] = clienthello[p]^clientoffset;
}
///Hidden
printf("Data :%s:\n",clienthello);
///

}