Last active
April 15, 2021 18:54
-
-
Save DreamVB/6e89f0fca978b703d885ed1ead112c78 to your computer and use it in GitHub Desktop.
XOR File using c
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#define _CRT_SECURE_NO_WARNINGS | |
#include <stdio.h> | |
#include <string> | |
int PasswordKey(char *pws){ | |
int x = 0; | |
size_t i = 0; | |
x = 1586; | |
while (pws[i]){ | |
x += (int)pws[i]; | |
i++; | |
} | |
return x; | |
} | |
int main(int argc, char *argv[]) | |
{ | |
FILE *fp1 = nullptr; | |
FILE *fp2 = nullptr; | |
char c = '\0'; | |
int key = 0; | |
//Check syntax of command | |
if (argc < 4){ | |
fprintf(stdout, "Usage input-file output-file password.\n"); | |
return EXIT_FAILURE; | |
} | |
//Check for password | |
if (strlen(argv[3]) == 0){ | |
fprintf(stdout,"Password Required.\n"); | |
return EXIT_FAILURE; | |
} | |
//Open input file. | |
fp1 = fopen(argv[1], "rb"); | |
//Check that file is opened | |
if (fp1 == NULL){ | |
fprintf(stdout,"The Input File Was Not Found.\n"); | |
return EXIT_FAILURE; | |
} | |
//Open output file for writeing. | |
fp2 = fopen(argv[2], "wb"); | |
//Check that output file was created. | |
if (!fp2){ | |
fprintf(stdout,"Cannot Write To Output File.\n"); | |
_fcloseall(); | |
return EXIT_FAILURE; | |
} | |
//Read input file data | |
srand(PasswordKey(argv[3])); | |
while (!feof(fp1)){ | |
//Get char from input | |
c = getc(fp1); | |
if (!feof(fp1)){ | |
//Get random value from key | |
key = rand() % 255; | |
//Xor key with current char | |
key ^= c; | |
//Write char to output file. | |
fputc((char)key, fp2); | |
} | |
} | |
//Close opened files | |
_fcloseall(); | |
return EXIT_SUCCESS; | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Thanks Rick for the info I now had time to update the changes you said I also done a few other minor tweaks.