blob: b03b89cc3c0badce2fa35e77b3f001f25536b60c (
plain)
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
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
#include<stdio.h>
#include<openssl/rand.h>
#include<unistd.h>
int main(int argc, char* argv[]) {
int opt;
int nbytes = 256;
char* defname = "default.key";
char* output;
int defout = 0;
int defbyte = 0;
int noopts = 0;
while ((opt = getopt(argc, argv, "b:o:")) != -1) {
switch (opt) {
case 'b':
nbytes = atoi(optarg);
defbyte = 1;
break;
case 'o':
output = argv[(optind-1)];
defout = 1;
break;
default:
fprintf(stderr, "Usage: %s [-b nbytes] [-o output] \n", argv[0]);
exit(EXIT_FAILURE);
}
if (noopts == 0) {
noopts = 1;
}
}
if(noopts == 0) {
printf("WARNING no option specified usign default values... \n");
}
if (nbytes < 0) {
printf("Negative byte value inserted! \n");
printf("Exiting... \n");
exit(EXIT_FAILURE);
} else if (nbytes != 0) {
if (defbyte == 0) {
printf("No byte number specified... using default value: 256 \n");
}
unsigned char key[nbytes];
RAND_bytes(key, nbytes);
if (defout == 0) {
output = defname;
printf("No output name specified... using default value: default.key \n");
}
FILE* file = fopen(output, "w");
fwrite(key, nbytes, 1, file);
fclose(file);
printf("Created key file %s of %d bytes \n", output, nbytes);
} else {
printf("Byte number specified is 0. \n");
printf("Doing nothing! \n");
}
exit(EXIT_SUCCESS);
}
|
