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 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
  15 int 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 }