بلييييز أريد مساااعدتكم

مرحبااا

لو سمحتوووووا أريدكم تساعدووني ف كتابة هالبرنااامج بليييييييييييز ضروووري وبأسرع وقت ممكن لو تكرمتووووا

Question :

In many applications one may need to encrypt data for storage or transmission. XTEA is a simple but powerful encryption algorithm that can be used in many embedded systems. The

algorithm operates on 64 bit blocks (i.e. two 32-bit words). It takes a 64-bit block (plain text) and 128 bit key to produce a 64-bit result (cipher text).

Modify your design to include encryption using XTEA. Select a secret message and a secret key, encrypt the message and save the result in the SD-card as a file.

#include <string.h>

#include "lpc214x.h"

#include "lpc_config.h"

#include "uart.h"

#include "efs.h"

#include "ls.h"

#include "mkfs.h"

#include "interfaces/efsl_dbg_printf_arm.h"

#define rprintf efsl_debug_printf_arm

#define BAUD 115200

//#define BIT(x) ((unsigned long)1<<x)

EmbeddedFileSystem efs;

EmbeddedFile filer, filew;

DirList list;

unsigned short e;

unsigned char buf[513];

unsigned char buffer [513];

int main(void)

{

int i, n;

int8_t res;

Initialize();

uart0Init(UART_BAUD(BAUD), UART_8N1, UART_FIFO_8); // setup the UART

/* init efsl debug-output */

efsl_debug_devopen_arm(uart0Putch);

rprintf("SD Card Testing for ECCE5223 \r\n");

rprintf("CARD init...");

//initialize the file system library

res = efs_init(&efs, 0);

if(res!=0)

rprintf("failed with %i\n", res);

//create a file.

res = file_fopen(&filew, &efs.myFs, "project2.html", 'w');

if(res!=0)

rprintf("failed to open file %i\n", res);

strcpy((char *) buf, "Hello \r\n");

for(i=0; i<5; i++){

n = file_write(&filew, strlen((char *) buf), buf);

if(n == strlen((char *) buf))

rprintf("All data in buffer written\r\n");

else

rprintf("Not all data in buffer written\r\n");

}

// close the file and unmount the card

file_fclose(&filew);

fs_umount(&efs.myFs);

rprintf("done.\r\n");

res = file_fopen(&filer, &efs.myFs, "project2.html", 'r');

if(res!=0)

rprintf("failed to open file %i\n", res);

else

{

file_read(&filer,513,buffer);

rprintf(buffer);

}

while(1)

;

return 0; /* never reached */}