Encryption and decryption of C + + files

<spanstyle= "FONT-FAMILY:KAITI_GB2312;FONT-SIZE:18PX;" >//fileencrydecry.cpp: Defines the entry point for a console application. * * use different or budget to encrypt files is mainly to read the characters in the file to the key for each character XOR or operation saved to another file to achieve the function of encryption because of the nature of the encryption and decryption can use the same function/#include "stdafx.h" #include <filesystem> #include <stdlib.h> #defineOK0 #defineERR-1 #defineKEY0xa9 intfileconvert (charszoldfile[], Charsznewfile[]) {file*poldfile=null; The file*pnewfile=null;//pointer is initialized to a NULL charctemp; if (szoldfile==null| | sznewfile==null) {Returnerr} poldfile=fopen (Szoldfile, "RB");//binary read-write file if (poldfile==null) {returnerr;} pnewfile= fopen (Sznewfile, "WB"); if (pnewfile==null) {fclose (poldfile); Returnerr}//must read the character first and then do the file end to Judge Ctemp=fgetc (Poldfile); while (!feof (poldfile))//encountered file end return value of 0 {putchar (ctemp); FPUTC (ctemp,pnewfile); Ctemp=fgetc (Poldfile) ^key;//XOR encryption file} Fclose (Poldfile); Fclose (Pnewfile)//////////////////File Returnok } int_tmain (intargc,_tchar*argv[]) {charszfile1[]= "1.txt"; charszfile2[]= "2.txt"; charszfile3[]= "3.txt";// Different file formats can be modified Fileconvert (SZFILE1,SZFILE2); System ("PauSe "); Return0; } </span>