//Reprint please ask Brother Situ Cai to declare the program.
# include & ltstdio.h & gt
# include & ltstdlib.h & gt
# include & ltconio.h & gt//getche () needs
# include & ltstring.h & gt
char ch
//XOR function
int YiHuo(FILE *f0，FILE *fp，int passwordnum，int move，char key)
{
while(fread(& amp； ch， 1， 1，f0)，！ feof(f0))
{
If (key==49)// encryption
{
ch = ch+move；
(char)(ch^=passwordnum)；
fwrite(& amp； ch， 1， 1，FP)；
}
If (key==50)// Decryption
{
(char)(ch^=passwordnum)；
ch = ch+move；
fwrite(& amp； ch， 1， 1，FP)；
}
}
}
int main()
{
//encryption encryption decryption decryption
Files *f0, *fe, * fd
char fname 0[50]；
char ef name[50]= { 0 }；
char df name[50]= { 0 }；
char Password[50]={0}，key=0，key 2 = 0；
char sysfname[20]= { 0 }；
int p=0，passwordnum，move = 0； //Number of moves after XOR;
System ("CLS");
do
{
System ("CLS");
do
{
Printf(" 1- Encrypted file \ n ");
Printf(" 2- decrypt file \ n ");
printf(" ESC-Exit \ n ")；
key = getch()； //Read in the keyboard code
}
And ((key! = ' 1 ')& amp； & (Key! = ' 2 ')& amp； & (Key! =27));
Password [50] = 0;
password num = 0；
if (key==49)
{
System ("CLS");
Printf ("Please enter the absolute path of the file to be encrypted \ n");
scanf("%s "，fname 0)；
// while(key=0)
//Open the original file
if ((f0=fopen(fname0，" Rb))= = NULL)
{
Printf ("The file can't be opened! \ n ")；
key = 0； //When the file cannot be opened, the value of key changes.
Exit (0);
Printf ("Encryption failed \ n");
System ("suspended");
}
//Only when the file fname0 is successfully opened can you continue to open e fname.
if(key==49)
{
System ("CLS");
Printf ("Please enter the file storage path where encryption is completed \ n");
scanf("%s "，ef name)；
if ((fe=fopen(efname，" w+")= = NULL)
{
Printf ("The file can't be opened! \ n ")；
Printf ("Encryption failed \ n");
fclose(F0)；
System ("suspended");
Exit (0);
key = 0；
}
}
//If the file is opened successfully, enter the password.
if(key==49)
{
System ("CLS");
Printf ("Please enter password \ n");
Scanf("%s ",password);
//Convert the character password to integer XOR.
for(p = 0； Password [p]! =0; p++)
Password num+=((int)Password[p])；
move =(int)(password num % 9)；
while(move & gt； 9)
move =(int)(move % 9)；
printf("%d "，move)； System ("suspended");
}
if (key==49)
{//XOR encryption
System ("CLS");
A fire (f0, fe, passwordnum, move, key);
Printf ("\ nEncryption succeeded, and your output file path is: \ n");
printf("%s "，ef name)；
fclose(F0)；
fclose(Fe)；
}
}
if (key==50)
{
System ("CLS");
Printf ("Please enter the absolute path of the file to be decrypted \ n");
scanf("%s "，fname 0)；
// while(key=0)
//Open the original file
if ((f0=fopen(fname0，" Rb))= = NULL)
{
Printf ("The file can't be opened! \ n ")；
key = 0； //When the file cannot be opened, the value of key changes.
Exit (0);
Printf ("Decryption failed \ n");
System ("suspended");
}
//Only when the file fname0 is successfully opened can you continue to open dfname.
if(key==50)
{
System ("CLS");
Printf ("Please enter the storage path of the decrypted file \ n");
scanf("%s "，df name)；
if ((fd=fopen(dfname，" w+")= = NULL)
{
Printf ("decryption failed");
fclose(F0)；
System ("suspended");
Printf ("The file can't be opened! \ n ")；
Exit (0);
key = 0；
}
}
//If the file is opened successfully, enter the password.
if(key==50)
{
System ("CLS");
Printf ("Please enter password \ n");
Scanf("%s ",password);
//Convert the character password to integer XOR.
for(p = 0； Password [p]! =0; p++)
Password num+=((int)Password[p])；
move =(int)(password num % 9)；
while(move & gt； 9)
move =(int)(move % 9)；
move =(-move)；
}
if (key==50)
{//XOR encryption
System ("CLS");
One fire (f0, fd, passwordnum, move, key);
Printf ("\ nEncryption succeeded, and your output file path is: \n%S", df name);
System ("suspended");
fclose(F0)；
fclose(FD)；
}
}
}
And (key! =27); //End the loop when the key is 0, that is, both files are opened successfully.
Returns 0;
Printf ("\ nThanks for using! , program by stucaige \ n ");
System ("suspended");
}