wpa_passphrase.c

Go to the documentation of this file.

/*
 * WPA Supplicant - ASCII passphrase to WPA PSK tool
 * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"

#include "common.h"
#include "crypto/sha1.h"


int main(int argc, char *argv[])
{
        unsigned char psk[32];
        int i;
        char *ssid, *passphrase, buf[64], *pos;

        if (argc < 2) {
                printf("usage: wpa_passphrase <ssid> [passphrase]\n"
                        "\nIf passphrase is left out, it will be read from "
                        "stdin\n");
                return 1;
        }

        ssid = argv[1];

        if (argc > 2) {
                passphrase = argv[2];
        } else {
                printf("# reading passphrase from stdin\n");
                if (fgets(buf, sizeof(buf), stdin) == NULL) {
                        printf("Failed to read passphrase\n");
                        return 1;
                }
                buf[sizeof(buf) - 1] = '\0';
                pos = buf;
                while (*pos != '\0') {
                        if (*pos == '\r' || *pos == '\n') {
                                *pos = '\0';
                                break;
                        }
                        pos++;
                }
                passphrase = buf;
        }

        if (os_strlen(passphrase) < 8 || os_strlen(passphrase) > 63) {
                printf("Passphrase must be 8..63 characters\n");
                return 1;
        }

        pbkdf2_sha1(passphrase, ssid, os_strlen(ssid), 4096, psk, 32);

        printf("network={\n");
        printf("\tssid=\"%s\"\n", ssid);
        printf("\t#psk=\"%s\"\n", passphrase);
        printf("\tpsk=");
        for (i = 0; i < 32; i++)
                printf("%02x", psk[i]);
        printf("\n");
        printf("}\n");

        return 0;
}