1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
|
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* IEEE 802.11 WEP crypto support.
*/
#include "opt_wlan.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/endian.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_media.h>
#include <net/ethernet.h>
#include <net80211/ieee80211_var.h>
static void *wep_attach(struct ieee80211vap *, struct ieee80211_key *);
static void wep_detach(struct ieee80211_key *);
static int wep_setkey(struct ieee80211_key *);
static void wep_setiv(struct ieee80211_key *, uint8_t *);
static int wep_encap(struct ieee80211_key *, struct mbuf *);
static int wep_decap(struct ieee80211_key *, struct mbuf *, int);
static int wep_enmic(struct ieee80211_key *, struct mbuf *, int);
static int wep_demic(struct ieee80211_key *, struct mbuf *, int);
static const struct ieee80211_cipher wep = {
.ic_name = "WEP",
.ic_cipher = IEEE80211_CIPHER_WEP,
.ic_header = IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN,
.ic_trailer = IEEE80211_WEP_CRCLEN,
.ic_miclen = 0,
.ic_attach = wep_attach,
.ic_detach = wep_detach,
.ic_setkey = wep_setkey,
.ic_setiv = wep_setiv,
.ic_encap = wep_encap,
.ic_decap = wep_decap,
.ic_enmic = wep_enmic,
.ic_demic = wep_demic,
};
static int wep_encrypt(struct ieee80211_key *, struct mbuf *, int hdrlen);
static int wep_decrypt(struct ieee80211_key *, struct mbuf *, int hdrlen);
struct wep_ctx {
struct ieee80211vap *wc_vap; /* for diagnostics+statistics */
struct ieee80211com *wc_ic;
uint32_t wc_iv; /* initial vector for crypto */
};
/* number of references from net80211 layer */
static int nrefs = 0;
static void *
wep_attach(struct ieee80211vap *vap, struct ieee80211_key *k)
{
struct wep_ctx *ctx;
ctx = (struct wep_ctx *) IEEE80211_MALLOC(sizeof(struct wep_ctx),
M_80211_CRYPTO, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
if (ctx == NULL) {
vap->iv_stats.is_crypto_nomem++;
return NULL;
}
ctx->wc_vap = vap;
ctx->wc_ic = vap->iv_ic;
get_random_bytes(&ctx->wc_iv, sizeof(ctx->wc_iv));
nrefs++; /* NB: we assume caller locking */
return ctx;
}
static void
wep_detach(struct ieee80211_key *k)
{
struct wep_ctx *ctx = k->wk_private;
IEEE80211_FREE(ctx, M_80211_CRYPTO);
KASSERT(nrefs > 0, ("imbalanced attach/detach"));
nrefs--; /* NB: we assume caller locking */
}
static int
wep_setkey(struct ieee80211_key *k)
{
return k->wk_keylen >= 40/NBBY;
}
static void
wep_setiv(struct ieee80211_key *k, uint8_t *ivp)
{
struct wep_ctx *ctx = k->wk_private;
struct ieee80211vap *vap = ctx->wc_vap;
uint32_t iv;
uint8_t keyid;
keyid = ieee80211_crypto_get_keyid(vap, k) << 6;
/*
* XXX
* IV must not duplicate during the lifetime of the key.
* But no mechanism to renew keys is defined in IEEE 802.11
* for WEP. And the IV may be duplicated at other stations
* because the session key itself is shared. So we use a
* pseudo random IV for now, though it is not the right way.
*
* NB: Rather than use a strictly random IV we select a
* random one to start and then increment the value for
* each frame. This is an explicit tradeoff between
* overhead and security. Given the basic insecurity of
* WEP this seems worthwhile.
*/
/*
* Skip 'bad' IVs from Fluhrer/Mantin/Shamir:
* (B, 255, N) with 3 <= B < 16 and 0 <= N <= 255
*/
iv = ctx->wc_iv;
if ((iv & 0xff00) == 0xff00) {
int B = (iv & 0xff0000) >> 16;
if (3 <= B && B < 16)
iv += 0x0100;
}
ctx->wc_iv = iv + 1;
/*
* NB: Preserve byte order of IV for packet
* sniffers; it doesn't matter otherwise.
*/
#if _BYTE_ORDER == _BIG_ENDIAN
ivp[0] = iv >> 0;
ivp[1] = iv >> 8;
ivp[2] = iv >> 16;
#else
ivp[2] = iv >> 0;
ivp[1] = iv >> 8;
ivp[0] = iv >> 16;
#endif
ivp[3] = keyid;
}
/*
* Add privacy headers appropriate for the specified key.
*/
static int
wep_encap(struct ieee80211_key *k, struct mbuf *m)
{
struct wep_ctx *ctx = k->wk_private;
struct ieee80211com *ic = ctx->wc_ic;
struct ieee80211_frame *wh;
uint8_t *ivp;
int hdrlen;
int is_mgmt;
hdrlen = ieee80211_hdrspace(ic, mtod(m, void *));
wh = mtod(m, struct ieee80211_frame *);
is_mgmt = IEEE80211_IS_MGMT(wh);
/*
* Check to see if IV is required.
*/
if (is_mgmt && (k->wk_flags & IEEE80211_KEY_NOIVMGT))
return 1;
if ((! is_mgmt) && (k->wk_flags & IEEE80211_KEY_NOIV))
return 1;
/*
* Copy down 802.11 header and add the IV + KeyID.
*/
M_PREPEND(m, wep.ic_header, M_NOWAIT);
if (m == NULL)
return 0;
ivp = mtod(m, uint8_t *);
ovbcopy(ivp + wep.ic_header, ivp, hdrlen);
ivp += hdrlen;
wep_setiv(k, ivp);
/*
* Finally, do software encrypt if needed.
*/
if ((k->wk_flags & IEEE80211_KEY_SWENCRYPT) &&
!wep_encrypt(k, m, hdrlen))
return 0;
return 1;
}
/*
* Add MIC to the frame as needed.
*/
static int
wep_enmic(struct ieee80211_key *k, struct mbuf *m, int force)
{
return 1;
}
/*
* Validate and strip privacy headers (and trailer) for a
* received frame. If necessary, decrypt the frame using
* the specified key.
*/
static int
wep_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen)
{
struct wep_ctx *ctx = k->wk_private;
struct ieee80211vap *vap = ctx->wc_vap;
struct ieee80211_frame *wh;
const struct ieee80211_rx_stats *rxs;
wh = mtod(m, struct ieee80211_frame *);
rxs = ieee80211_get_rx_params_ptr(m);
if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_IV_STRIP))
goto finish;
/*
* Check if the device handled the decrypt in hardware.
* If so we just strip the header; otherwise we need to
* handle the decrypt in software.
*/
if ((k->wk_flags & IEEE80211_KEY_SWDECRYPT) &&
!wep_decrypt(k, m, hdrlen)) {
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
"%s", "WEP ICV mismatch on decrypt");
vap->iv_stats.is_rx_wepfail++;
return 0;
}
/*
* Copy up 802.11 header and strip crypto bits.
*/
ovbcopy(mtod(m, void *), mtod(m, uint8_t *) + wep.ic_header, hdrlen);
m_adj(m, wep.ic_header);
finish:
/* XXX TODO: do we have to strip this for offload devices? */
m_adj(m, -wep.ic_trailer);
return 1;
}
/*
* Verify and strip MIC from the frame.
*/
static int
wep_demic(struct ieee80211_key *k, struct mbuf *skb, int force)
{
return 1;
}
static const uint32_t crc32_table[256] = {
0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
0x2d02ef8dL
};
static int
wep_encrypt(struct ieee80211_key *key, struct mbuf *m0, int hdrlen)
{
#define S_SWAP(a,b) do { uint8_t t = S[a]; S[a] = S[b]; S[b] = t; } while(0)
struct wep_ctx *ctx = key->wk_private;
struct ieee80211vap *vap = ctx->wc_vap;
struct mbuf *m = m0;
uint8_t rc4key[IEEE80211_WEP_IVLEN + IEEE80211_KEYBUF_SIZE];
uint8_t icv[IEEE80211_WEP_CRCLEN];
uint32_t i, j, k, crc;
size_t buflen, data_len;
uint8_t S[256];
uint8_t *pos;
u_int off, keylen;
vap->iv_stats.is_crypto_wep++;
/* NB: this assumes the header was pulled up */
memcpy(rc4key, mtod(m, uint8_t *) + hdrlen, IEEE80211_WEP_IVLEN);
memcpy(rc4key + IEEE80211_WEP_IVLEN, key->wk_key, key->wk_keylen);
/* Setup RC4 state */
for (i = 0; i < 256; i++)
S[i] = i;
j = 0;
keylen = key->wk_keylen + IEEE80211_WEP_IVLEN;
for (i = 0; i < 256; i++) {
j = (j + S[i] + rc4key[i % keylen]) & 0xff;
S_SWAP(i, j);
}
off = hdrlen + wep.ic_header;
data_len = m->m_pkthdr.len - off;
/* Compute CRC32 over unencrypted data and apply RC4 to data */
crc = ~0;
i = j = 0;
pos = mtod(m, uint8_t *) + off;
buflen = m->m_len - off;
for (;;) {
if (buflen > data_len)
buflen = data_len;
data_len -= buflen;
for (k = 0; k < buflen; k++) {
crc = crc32_table[(crc ^ *pos) & 0xff] ^ (crc >> 8);
i = (i + 1) & 0xff;
j = (j + S[i]) & 0xff;
S_SWAP(i, j);
*pos++ ^= S[(S[i] + S[j]) & 0xff];
}
if (m->m_next == NULL) {
if (data_len != 0) { /* out of data */
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO,
ether_sprintf(mtod(m0,
struct ieee80211_frame *)->i_addr2),
"out of data for WEP (data_len %zu)",
data_len);
/* XXX stat */
return 0;
}
break;
}
m = m->m_next;
pos = mtod(m, uint8_t *);
buflen = m->m_len;
}
crc = ~crc;
/* Append little-endian CRC32 and encrypt it to produce ICV */
icv[0] = crc;
icv[1] = crc >> 8;
icv[2] = crc >> 16;
icv[3] = crc >> 24;
for (k = 0; k < IEEE80211_WEP_CRCLEN; k++) {
i = (i + 1) & 0xff;
j = (j + S[i]) & 0xff;
S_SWAP(i, j);
icv[k] ^= S[(S[i] + S[j]) & 0xff];
}
return m_append(m0, IEEE80211_WEP_CRCLEN, icv);
#undef S_SWAP
}
static int
wep_decrypt(struct ieee80211_key *key, struct mbuf *m0, int hdrlen)
{
#define S_SWAP(a,b) do { uint8_t t = S[a]; S[a] = S[b]; S[b] = t; } while(0)
struct wep_ctx *ctx = key->wk_private;
struct ieee80211vap *vap = ctx->wc_vap;
struct mbuf *m = m0;
uint8_t rc4key[IEEE80211_WEP_IVLEN + IEEE80211_KEYBUF_SIZE];
uint8_t icv[IEEE80211_WEP_CRCLEN];
uint32_t i, j, k, crc;
size_t buflen, data_len;
uint8_t S[256];
uint8_t *pos;
u_int off, keylen;
vap->iv_stats.is_crypto_wep++;
/* NB: this assumes the header was pulled up */
memcpy(rc4key, mtod(m, uint8_t *) + hdrlen, IEEE80211_WEP_IVLEN);
memcpy(rc4key + IEEE80211_WEP_IVLEN, key->wk_key, key->wk_keylen);
/* Setup RC4 state */
for (i = 0; i < 256; i++)
S[i] = i;
j = 0;
keylen = key->wk_keylen + IEEE80211_WEP_IVLEN;
for (i = 0; i < 256; i++) {
j = (j + S[i] + rc4key[i % keylen]) & 0xff;
S_SWAP(i, j);
}
off = hdrlen + wep.ic_header;
data_len = m->m_pkthdr.len - (off + wep.ic_trailer);
/* Compute CRC32 over unencrypted data and apply RC4 to data */
crc = ~0;
i = j = 0;
pos = mtod(m, uint8_t *) + off;
buflen = m->m_len - off;
for (;;) {
if (buflen > data_len)
buflen = data_len;
data_len -= buflen;
for (k = 0; k < buflen; k++) {
i = (i + 1) & 0xff;
j = (j + S[i]) & 0xff;
S_SWAP(i, j);
*pos ^= S[(S[i] + S[j]) & 0xff];
crc = crc32_table[(crc ^ *pos) & 0xff] ^ (crc >> 8);
pos++;
}
m = m->m_next;
if (m == NULL) {
if (data_len != 0) { /* out of data */
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO,
mtod(m0, struct ieee80211_frame *)->i_addr2,
"out of data for WEP (data_len %zu)",
data_len);
return 0;
}
break;
}
pos = mtod(m, uint8_t *);
buflen = m->m_len;
}
crc = ~crc;
/* Encrypt little-endian CRC32 and verify that it matches with
* received ICV */
icv[0] = crc;
icv[1] = crc >> 8;
icv[2] = crc >> 16;
icv[3] = crc >> 24;
for (k = 0; k < IEEE80211_WEP_CRCLEN; k++) {
i = (i + 1) & 0xff;
j = (j + S[i]) & 0xff;
S_SWAP(i, j);
/* XXX assumes ICV is contiguous in mbuf */
if ((icv[k] ^ S[(S[i] + S[j]) & 0xff]) != *pos++) {
/* ICV mismatch - drop frame */
return 0;
}
}
return 1;
#undef S_SWAP
}
/*
* Module glue.
*/
IEEE80211_CRYPTO_MODULE(wep, 1);
|