1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int main(int argc, char** argv) {
/* We need a file to encrypt */
if(argc==1) {
fprintf(stderr, "Arguments fool!");
return 1;
}
/* Now lets open that file */
FILE* file = fopen(argv[1], "r");
/* And a temporary file to hold the encrypted data */
char tpath[255] = "/tmp/";
strcat(tpath, argv[1]);
FILE* temp = fopen(tpath, "w");
/* Now we need the passphrase. Get it */
printf("Enter Passphrase:\n");
char passphrase[255];
fgets(passphrase, 255, stdin);
int passlen = strlen(passphrase) - 1;
int c,j=0;
/* Now we encrypt! */
while((c=fgetc(file)) != EOF) {
if(j==passlen) {
fputc(c+passphrase[0], temp);
j=1;
} else {
fputc(c+passphrase[j], temp);
j++;
}
}
/* Close the files */
fflush(temp);
fclose(temp);
fclose(file);
/* Move the file back */
char cmd[255];
sprintf(cmd, "%s %s %s", "/bin/mv", tpath, argv[1]);
system(cmd);
return 0;
}
|
