wpa_passphrase.c revision 61d9df3e62aaa0e87ad05452fcb95142159a17b6 
1/*
2 * WPA Supplicant - ASCII passphrase to WPA PSK tool
3 * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#include "includes.h"
10
11#include "common.h"
12#include "crypto/sha1.h"
13
14
15int main(int argc, char *argv[])
16{
17	unsigned char psk[32];
18	int i;
19	char *ssid, *passphrase, buf[64], *pos;
20
21	if (argc < 2) {
22		printf("usage: wpa_passphrase <ssid> [passphrase]\n"
23			"\nIf passphrase is left out, it will be read from "
24			"stdin\n");
25		return 1;
26	}
27
28	ssid = argv[1];
29
30	if (argc > 2) {
31		passphrase = argv[2];
32	} else {
33		printf("# reading passphrase from stdin\n");
34		if (fgets(buf, sizeof(buf), stdin) == NULL) {
35			printf("Failed to read passphrase\n");
36			return 1;
37		}
38		buf[sizeof(buf) - 1] = '\0';
39		pos = buf;
40		while (*pos != '\0') {
41			if (*pos == '\r' || *pos == '\n') {
42				*pos = '\0';
43				break;
44			}
45			pos++;
46		}
47		passphrase = buf;
48	}
49
50	if (os_strlen(passphrase) < 8 || os_strlen(passphrase) > 63) {
51		printf("Passphrase must be 8..63 characters\n");
52		return 1;
53	}
54
55	pbkdf2_sha1(passphrase, (u8 *) ssid, os_strlen(ssid), 4096, psk, 32);
56
57	printf("network={\n");
58	printf("\tssid=\"%s\"\n", ssid);
59	printf("\t#psk=\"%s\"\n", passphrase);
60	printf("\tpsk=");
61	for (i = 0; i < 32; i++)
62		printf("%02x", psk[i]);
63	printf("\n");
64	printf("}\n");
65
66	return 0;
67}
68