1 #include <stdio.h>
2 #include <string.h>
3
4 #define MAXLEN 256
5
6 int readfile(char* path, char* buf) {
7 FILE* fd;
8 fd = fopen(path, "r");
9 if(!fd)
10 return -1;
11 fgets(buf, MAXLEN, fd);
12 fclose(fd);
13 return 0;
14 }
15
16 void applexor(char* msg, char* out) {
17 int keys[] = {125, 137, 82, 35, 210, 188, 221, 234, 163, 185, 31};
18 int i = 0;
19
20 // Encrypt/decrypt (xor)
21 for(i=0; msg[i] != '\0'; i++)
22 out[i] = msg[i] ^ keys[i % 11];
23
24 // If the previous char wasn't a null byte, we are likely encrypting not
25 // decrypting, so add a null byte.
26 if(out[i-1] != '\0') {
27 out[i] = '\0' ^ keys[i % 11];
28 i++;
29 }
30
31 // Append until we hit a multiple of 12
32 for(; i%12 != 0; i++)
33 out[i] = msg[i%strlen(msg)] ^ keys[i % 11];
34 out[i] = '\0' ;
35 }
36
37 int main(int argc, char* argv[]) {
38 char in[MAXLEN];
39 char out[MAXLEN];
40 if(argc == 1) {
41 printf("Must provide path to file or a password to encrypt\n");
42 return 1;
43 }
44
45 // If the file can't be opened, try to use the "path" as a password
46 if(readfile(argv[1], in) == -1)
47 strcpy(in, argv[1]);
48
49 applexor(in, out);
50
51 printf("%s\n", out);
52 return 0;
53 }
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