wpa_supplicant/wpa_passphrase.c

   1 /*
   2  * WPA Supplicant - ASCII passphrase to WPA PSK tool
   3  * Copyright (c) 2003-2005, Jouni Malinen <j@w1.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 "includes.h"
  16
  17 #include "common.h"
  18 #include "crypto/sha1.h"
  19
  20
  21 int main(int argc, char *argv[])
  22 {
  23         unsigned char psk[32];
  24         int i;
  25         char *ssid, *passphrase, buf[64], *pos;
  26
  27         if (argc < 2) {
  28                 printf("usage: wpa_passphrase <ssid> [passphrase]\n"
  29                         "\nIf passphrase is left out, it will be read from "
  30                         "stdin\n");
  31                 return 1;
  32         }
  33
  34         ssid = argv[1];
  35
  36         if (argc > 2) {
  37                 passphrase = argv[2];
  38         } else {
  39                 printf("# reading passphrase from stdin\n");
  40                 if (fgets(buf, sizeof(buf), stdin) == NULL) {
  41                         printf("Failed to read passphrase\n");
  42                         return 1;
  43                 }
  44                 buf[sizeof(buf) - 1] = '\0';
  45                 pos = buf;
  46                 while (*pos != '\0') {
  47                         if (*pos == '\r' || *pos == '\n') {
  48                                 *pos = '\0';
  49                                 break;
  50                         }
  51                         pos++;
  52                 }
  53                 passphrase = buf;
  54         }
  55
  56         if (os_strlen(passphrase) < 8 || os_strlen(passphrase) > 63) {
  57                 printf("Passphrase must be 8..63 characters\n");
  58                 return 1;
  59         }
  60
  61         pbkdf2_sha1(passphrase, ssid, os_strlen(ssid), 4096, psk, 32);
  62
  63         printf("network={\n");
  64         printf("\tssid=\"%s\"\n", ssid);
  65         printf("\t#psk=\"%s\"\n", passphrase);
  66         printf("\tpsk=");
  67         for (i = 0; i < 32; i++)
  68                 printf("%02x", psk[i]);
  69         printf("\n");
  70         printf("}\n");
  71
  72         return 0;
  73 }