contrib/wpa_supplicant-0.4.9/wpa_passphrase.c

   1 /*
   2  * WPA Supplicant - ASCII passphrase to WPA PSK tool
   3  * Copyright (c) 2003-2005, Jouni Malinen <jkmaline@cc.hut.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include <stdio.h>
  16 #include <string.h>
  17
  18 #include "common.h"
  19 #include "sha1.h"
  20
  21
  22 int main(int argc, char *argv[])
  23 {
  24         unsigned char psk[32];
  25         int i;
  26         char *ssid, *passphrase, buf[64], *pos;
  27
  28         if (argc < 2) {
  29                 printf("usage: wpa_passphrase <ssid> [passphrase]\n"
  30                         "\nIf passphrase is left out, it will be read from "
  31                         "stdin\n");
  32                 return 1;
  33         }
  34
  35         ssid = argv[1];
  36
  37         if (argc > 2) {
  38                 passphrase = argv[2];
  39         } else {
  40                 printf("# reading passphrase from stdin\n");
  41                 if (fgets(buf, sizeof(buf), stdin) == NULL) {
  42                         printf("Failed to read passphrase\n");
  43                         return 1;
  44                 }
  45                 buf[sizeof(buf) - 1] = '\0';
  46                 pos = buf;
  47                 while (*pos != '\0') {
  48                         if (*pos == '\r' || *pos == '\n') {
  49                                 *pos = '\0';
  50                                 break;
  51                         }
  52                         pos++;
  53                 }
  54                 passphrase = buf;
  55         }
  56
  57         if (strlen(passphrase) < 8 || strlen(passphrase) > 63) {
  58                 printf("Passphrase must be 8..63 characters\n");
  59                 return 1;
  60         }
  61
  62         pbkdf2_sha1(passphrase, ssid, strlen(ssid), 4096, psk, 32);
  63
  64         printf("network={\n");
  65         printf("\tssid=\"%s\"\n", ssid);
  66         printf("\t#psk=\"%s\"\n", passphrase);
  67         printf("\tpsk=");
  68         for (i = 0; i < 32; i++)
  69                 printf("%02x", psk[i]);
  70         printf("\n");
  71         printf("}\n");
  72
  73         return 0;
  74 }