0c7b3814ca
Hostapd uses 'crc32' name for IEEE802.11 CRC-32 routine. This name is too generic. Buildroot autobuilder detected build configuration that failed to build due to the naming conflict: static linking with openssl using zlib-ng as a zlib provider, e.g. see: - http://autobuild.buildroot.net/results/9901df820d3afa4cde78e8ad6d62cb8ce7e69fdb/ - http://autobuild.buildroot.net/results/ac19975f0bf77f4a8ca574c374092ba81cd5a332/ Use a less generic name ieee80211_crc32 for IEEE802.11 CRC-32 routine to avoid such naming conflicts. Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
104 lines
1.9 KiB
C
104 lines
1.9 KiB
C
/*
|
|
* Wired Equivalent Privacy (WEP)
|
|
* Copyright (c) 2010, Jouni Malinen <j@w1.fi>
|
|
*
|
|
* This software may be distributed under the terms of the BSD license.
|
|
* See README for more details.
|
|
*/
|
|
|
|
#include "utils/includes.h"
|
|
|
|
#include "utils/common.h"
|
|
#include "utils/crc32.h"
|
|
#include "common/ieee802_11_defs.h"
|
|
#include "wlantest.h"
|
|
|
|
|
|
void wep_crypt(u8 *key, u8 *buf, size_t plen)
|
|
{
|
|
u32 i, j, k;
|
|
u8 S[256];
|
|
#define S_SWAP(a,b) do { u8 t = S[a]; S[a] = S[b]; S[b] = t; } while(0)
|
|
u8 *pos;
|
|
|
|
/* Setup RC4 state */
|
|
for (i = 0; i < 256; i++)
|
|
S[i] = i;
|
|
j = 0;
|
|
for (i = 0; i < 256; i++) {
|
|
j = (j + S[i] + key[i & 0x0f]) & 0xff;
|
|
S_SWAP(i, j);
|
|
}
|
|
|
|
/* Apply RC4 to data */
|
|
pos = buf;
|
|
i = j = 0;
|
|
for (k = 0; k < plen; k++) {
|
|
i = (i + 1) & 0xff;
|
|
j = (j + S[i]) & 0xff;
|
|
S_SWAP(i, j);
|
|
*pos ^= S[(S[i] + S[j]) & 0xff];
|
|
pos++;
|
|
}
|
|
}
|
|
|
|
|
|
static int try_wep(const u8 *key, size_t key_len, const u8 *data,
|
|
size_t data_len, u8 *plain)
|
|
{
|
|
u32 icv, rx_icv;
|
|
u8 k[16];
|
|
int i, j;
|
|
|
|
for (i = 0, j = 0; i < sizeof(k); i++) {
|
|
k[i] = key[j];
|
|
j++;
|
|
if (j >= key_len)
|
|
j = 0;
|
|
}
|
|
|
|
os_memcpy(plain, data, data_len);
|
|
wep_crypt(k, plain, data_len);
|
|
icv = ieee80211_crc32(plain, data_len - 4);
|
|
rx_icv = WPA_GET_LE32(plain + data_len - 4);
|
|
if (icv != rx_icv)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
u8 * wep_decrypt(struct wlantest *wt, const struct ieee80211_hdr *hdr,
|
|
const u8 *data, size_t data_len, size_t *decrypted_len)
|
|
{
|
|
u8 *plain;
|
|
struct wlantest_wep *w;
|
|
int found = 0;
|
|
u8 key[16];
|
|
|
|
if (dl_list_empty(&wt->wep))
|
|
return NULL;
|
|
|
|
if (data_len < 4 + 4)
|
|
return NULL;
|
|
plain = os_malloc(data_len - 4);
|
|
if (plain == NULL)
|
|
return NULL;
|
|
|
|
dl_list_for_each(w, &wt->wep, struct wlantest_wep, list) {
|
|
os_memcpy(key, data, 3);
|
|
os_memcpy(key + 3, w->key, w->key_len);
|
|
if (try_wep(key, 3 + w->key_len, data + 4, data_len - 4, plain)
|
|
== 0) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (!found) {
|
|
os_free(plain);
|
|
return NULL;
|
|
}
|
|
|
|
*decrypted_len = data_len - 4 - 4;
|
|
return plain;
|
|
}
|