2 * Host AP crypt: host-based TKIP encryption implementation for Host AP driver
4 * Copyright (c) 2003-2004, Jouni Malinen <jkmaline@cc.hut.fi>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation. See README and COPYING for
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/slab.h>
15 #include <linux/random.h>
16 #include <linux/skbuff.h>
17 #include <linux/netdevice.h>
18 #include <linux/if_ether.h>
19 #include <linux/if_arp.h>
20 #include <linux/string.h>
22 #include "ieee80211.h"
24 #include <linux/crypto.h>
25 #include <linux/scatterlist.h>
26 #include <linux/crc32.h>
28 MODULE_AUTHOR("Jouni Malinen");
29 MODULE_DESCRIPTION("Host AP crypt: TKIP");
30 MODULE_LICENSE("GPL");
32 struct ieee80211_tkip_data {
33 #define TKIP_KEY_LEN 32
49 u32 dot11RSNAStatsTKIPReplays;
50 u32 dot11RSNAStatsTKIPICVErrors;
51 u32 dot11RSNAStatsTKIPLocalMICFailures;
55 struct crypto_blkcipher *rx_tfm_arc4;
56 struct crypto_hash *rx_tfm_michael;
57 struct crypto_blkcipher *tx_tfm_arc4;
58 struct crypto_hash *tx_tfm_michael;
60 /* scratch buffers for virt_to_page() (crypto API) */
61 u8 rx_hdr[16], tx_hdr[16];
64 static void *ieee80211_tkip_init(int key_idx)
66 struct ieee80211_tkip_data *priv;
68 priv = kzalloc(sizeof(*priv), GFP_ATOMIC);
71 priv->key_idx = key_idx;
73 priv->tx_tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0,
75 if (IS_ERR(priv->tx_tfm_arc4)) {
76 printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
78 priv->tx_tfm_arc4 = NULL;
82 priv->tx_tfm_michael = crypto_alloc_hash("michael_mic", 0,
84 if (IS_ERR(priv->tx_tfm_michael)) {
85 printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
86 "crypto API michael_mic\n");
87 priv->tx_tfm_michael = NULL;
91 priv->rx_tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0,
93 if (IS_ERR(priv->rx_tfm_arc4)) {
94 printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
96 priv->rx_tfm_arc4 = NULL;
100 priv->rx_tfm_michael = crypto_alloc_hash("michael_mic", 0,
102 if (IS_ERR(priv->rx_tfm_michael)) {
103 printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
104 "crypto API michael_mic\n");
105 priv->rx_tfm_michael = NULL;
113 if (priv->tx_tfm_michael)
114 crypto_free_hash(priv->tx_tfm_michael);
115 if (priv->tx_tfm_arc4)
116 crypto_free_blkcipher(priv->tx_tfm_arc4);
117 if (priv->rx_tfm_michael)
118 crypto_free_hash(priv->rx_tfm_michael);
119 if (priv->rx_tfm_arc4)
120 crypto_free_blkcipher(priv->rx_tfm_arc4);
128 static void ieee80211_tkip_deinit(void *priv)
130 struct ieee80211_tkip_data *_priv = priv;
133 if (_priv->tx_tfm_michael)
134 crypto_free_hash(_priv->tx_tfm_michael);
135 if (_priv->tx_tfm_arc4)
136 crypto_free_blkcipher(_priv->tx_tfm_arc4);
137 if (_priv->rx_tfm_michael)
138 crypto_free_hash(_priv->rx_tfm_michael);
139 if (_priv->rx_tfm_arc4)
140 crypto_free_blkcipher(_priv->rx_tfm_arc4);
146 static inline u16 RotR1(u16 val)
148 return (val >> 1) | (val << 15);
152 static inline u8 Lo8(u16 val)
158 static inline u8 Hi8(u16 val)
164 static inline u16 Lo16(u32 val)
170 static inline u16 Hi16(u32 val)
176 static inline u16 Mk16(u8 hi, u8 lo)
178 return lo | (((u16) hi) << 8);
182 static inline u16 Mk16_le(u16 *v)
184 return le16_to_cpu(*v);
188 static const u16 Sbox[256] = {
189 0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154,
190 0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A,
191 0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B,
192 0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B,
193 0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F,
194 0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F,
195 0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5,
196 0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F,
197 0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB,
198 0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397,
199 0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED,
200 0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A,
201 0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194,
202 0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3,
203 0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104,
204 0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D,
205 0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39,
206 0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695,
207 0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83,
208 0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76,
209 0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4,
210 0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B,
211 0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0,
212 0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018,
213 0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751,
214 0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85,
215 0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12,
216 0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9,
217 0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7,
218 0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A,
219 0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8,
220 0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A,
224 static inline u16 _S_(u16 v)
226 u16 t = Sbox[Hi8(v)];
227 return Sbox[Lo8(v)] ^ ((t << 8) | (t >> 8));
231 #define PHASE1_LOOP_COUNT 8
234 static void tkip_mixing_phase1(u16 *TTAK, const u8 *TK, const u8 *TA, u32 IV32)
238 /* Initialize the 80-bit TTAK from TSC (IV32) and TA[0..5] */
239 TTAK[0] = Lo16(IV32);
240 TTAK[1] = Hi16(IV32);
241 TTAK[2] = Mk16(TA[1], TA[0]);
242 TTAK[3] = Mk16(TA[3], TA[2]);
243 TTAK[4] = Mk16(TA[5], TA[4]);
245 for (i = 0; i < PHASE1_LOOP_COUNT; i++) {
247 TTAK[0] += _S_(TTAK[4] ^ Mk16(TK[1 + j], TK[0 + j]));
248 TTAK[1] += _S_(TTAK[0] ^ Mk16(TK[5 + j], TK[4 + j]));
249 TTAK[2] += _S_(TTAK[1] ^ Mk16(TK[9 + j], TK[8 + j]));
250 TTAK[3] += _S_(TTAK[2] ^ Mk16(TK[13 + j], TK[12 + j]));
251 TTAK[4] += _S_(TTAK[3] ^ Mk16(TK[1 + j], TK[0 + j])) + i;
256 static void tkip_mixing_phase2(u8 *WEPSeed, const u8 *TK, const u16 *TTAK,
260 * Make temporary area overlap WEP seed so that the final copy can be
261 * avoided on little endian hosts.
263 u16 *PPK = (u16 *) &WEPSeed[4];
265 /* Step 1 - make copy of TTAK and bring in TSC */
271 PPK[5] = TTAK[4] + IV16;
273 /* Step 2 - 96-bit bijective mixing using S-box */
274 PPK[0] += _S_(PPK[5] ^ Mk16_le((u16 *) &TK[0]));
275 PPK[1] += _S_(PPK[0] ^ Mk16_le((u16 *) &TK[2]));
276 PPK[2] += _S_(PPK[1] ^ Mk16_le((u16 *) &TK[4]));
277 PPK[3] += _S_(PPK[2] ^ Mk16_le((u16 *) &TK[6]));
278 PPK[4] += _S_(PPK[3] ^ Mk16_le((u16 *) &TK[8]));
279 PPK[5] += _S_(PPK[4] ^ Mk16_le((u16 *) &TK[10]));
281 PPK[0] += RotR1(PPK[5] ^ Mk16_le((u16 *) &TK[12]));
282 PPK[1] += RotR1(PPK[0] ^ Mk16_le((u16 *) &TK[14]));
283 PPK[2] += RotR1(PPK[1]);
284 PPK[3] += RotR1(PPK[2]);
285 PPK[4] += RotR1(PPK[3]);
286 PPK[5] += RotR1(PPK[4]);
289 * Step 3 - bring in last of TK bits, assign 24-bit WEP IV value
290 * WEPSeed[0..2] is transmitted as WEP IV
292 WEPSeed[0] = Hi8(IV16);
293 WEPSeed[1] = (Hi8(IV16) | 0x20) & 0x7F;
294 WEPSeed[2] = Lo8(IV16);
295 WEPSeed[3] = Lo8((PPK[5] ^ Mk16_le((u16 *) &TK[0])) >> 1);
301 for (i = 0; i < 6; i++)
302 PPK[i] = (PPK[i] << 8) | (PPK[i] >> 8);
308 static int ieee80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
310 struct ieee80211_tkip_data *tkey = priv;
313 struct rtl_80211_hdr_4addr *hdr;
314 cb_desc *tcb_desc = (cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
315 struct blkcipher_desc desc = {.tfm = tkey->tx_tfm_arc4};
319 struct scatterlist sg;
321 if (skb_headroom(skb) < 8 || skb_tailroom(skb) < 4 ||
325 hdr = (struct rtl_80211_hdr_4addr *) skb->data;
327 if (!tcb_desc->bHwSec) {
328 if (!tkey->tx_phase1_done) {
329 tkip_mixing_phase1(tkey->tx_ttak, tkey->key, hdr->addr2,
331 tkey->tx_phase1_done = 1;
333 tkip_mixing_phase2(rc4key, tkey->key, tkey->tx_ttak, tkey->tx_iv16);
335 tkey->tx_phase1_done = 1;
338 len = skb->len - hdr_len;
339 pos = skb_push(skb, 8);
340 memmove(pos, pos + 8, hdr_len);
343 if (tcb_desc->bHwSec) {
344 *pos++ = Hi8(tkey->tx_iv16);
345 *pos++ = (Hi8(tkey->tx_iv16) | 0x20) & 0x7F;
346 *pos++ = Lo8(tkey->tx_iv16);
353 *pos++ = (tkey->key_idx << 6) | (1 << 5) /* Ext IV included */;
354 *pos++ = tkey->tx_iv32 & 0xff;
355 *pos++ = (tkey->tx_iv32 >> 8) & 0xff;
356 *pos++ = (tkey->tx_iv32 >> 16) & 0xff;
357 *pos++ = (tkey->tx_iv32 >> 24) & 0xff;
359 if (!tcb_desc->bHwSec) {
360 icv = skb_put(skb, 4);
361 crc = ~crc32_le(~0, pos, len);
366 crypto_blkcipher_setkey(tkey->tx_tfm_arc4, rc4key, 16);
367 sg_init_one(&sg, pos, len+4);
368 ret = crypto_blkcipher_encrypt(&desc, &sg, &sg, len + 4);
372 if (tkey->tx_iv16 == 0) {
373 tkey->tx_phase1_done = 0;
377 if (!tcb_desc->bHwSec)
385 static int ieee80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
387 struct ieee80211_tkip_data *tkey = priv;
391 struct rtl_80211_hdr_4addr *hdr;
392 cb_desc *tcb_desc = (cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
393 struct blkcipher_desc desc = {.tfm = tkey->rx_tfm_arc4};
397 struct scatterlist sg;
400 if (skb->len < hdr_len + 8 + 4)
403 hdr = (struct rtl_80211_hdr_4addr *) skb->data;
404 pos = skb->data + hdr_len;
406 if (!(keyidx & (1 << 5))) {
407 if (net_ratelimit()) {
408 printk(KERN_DEBUG "TKIP: received packet without ExtIV"
409 " flag from %pM\n", hdr->addr2);
414 if (tkey->key_idx != keyidx) {
415 printk(KERN_DEBUG "TKIP: RX tkey->key_idx=%d frame "
416 "keyidx=%d priv=%p\n", tkey->key_idx, keyidx, priv);
419 if (!tkey->key_set) {
420 if (net_ratelimit()) {
421 printk(KERN_DEBUG "TKIP: received packet from %pM"
422 " with keyid=%d that does not have a configured"
423 " key\n", hdr->addr2, keyidx);
427 iv16 = (pos[0] << 8) | pos[2];
428 iv32 = pos[4] | (pos[5] << 8) | (pos[6] << 16) | (pos[7] << 24);
431 if (!tcb_desc->bHwSec) {
432 if (iv32 < tkey->rx_iv32 ||
433 (iv32 == tkey->rx_iv32 && iv16 <= tkey->rx_iv16)) {
434 if (net_ratelimit()) {
435 printk(KERN_DEBUG "TKIP: replay detected: STA=%pM"
436 " previous TSC %08x%04x received TSC "
437 "%08x%04x\n", hdr->addr2,
438 tkey->rx_iv32, tkey->rx_iv16, iv32, iv16);
440 tkey->dot11RSNAStatsTKIPReplays++;
444 if (iv32 != tkey->rx_iv32 || !tkey->rx_phase1_done) {
445 tkip_mixing_phase1(tkey->rx_ttak, tkey->key, hdr->addr2, iv32);
446 tkey->rx_phase1_done = 1;
448 tkip_mixing_phase2(rc4key, tkey->key, tkey->rx_ttak, iv16);
450 plen = skb->len - hdr_len - 12;
452 crypto_blkcipher_setkey(tkey->rx_tfm_arc4, rc4key, 16);
453 sg_init_one(&sg, pos, plen+4);
455 if (crypto_blkcipher_decrypt(&desc, &sg, &sg, plen + 4)) {
456 if (net_ratelimit()) {
457 printk(KERN_DEBUG ": TKIP: failed to decrypt "
458 "received packet from %pM\n",
464 crc = ~crc32_le(~0, pos, plen);
470 if (memcmp(icv, pos + plen, 4) != 0) {
471 if (iv32 != tkey->rx_iv32) {
473 * Previously cached Phase1 result was already
474 * lost, so it needs to be recalculated for the
477 tkey->rx_phase1_done = 0;
479 if (net_ratelimit()) {
480 printk(KERN_DEBUG "TKIP: ICV error detected: STA="
481 "%pM\n", hdr->addr2);
483 tkey->dot11RSNAStatsTKIPICVErrors++;
490 * Update real counters only after Michael MIC verification has
493 tkey->rx_iv32_new = iv32;
494 tkey->rx_iv16_new = iv16;
496 /* Remove IV and ICV */
497 memmove(skb->data + 8, skb->data, hdr_len);
499 skb_trim(skb, skb->len - 4);
504 static int michael_mic(struct crypto_hash *tfm_michael, u8 *key, u8 *hdr,
505 u8 *data, size_t data_len, u8 *mic)
507 struct hash_desc desc;
508 struct scatterlist sg[2];
510 if (tfm_michael == NULL) {
511 printk(KERN_WARNING "michael_mic: tfm_michael == NULL\n");
515 sg_init_table(sg, 2);
516 sg_set_buf(&sg[0], hdr, 16);
517 sg_set_buf(&sg[1], data, data_len);
519 if (crypto_hash_setkey(tfm_michael, key, 8))
522 desc.tfm = tfm_michael;
524 return crypto_hash_digest(&desc, sg, data_len + 16, mic);
527 static void michael_mic_hdr(struct sk_buff *skb, u8 *hdr)
529 struct rtl_80211_hdr_4addr *hdr11;
531 hdr11 = (struct rtl_80211_hdr_4addr *) skb->data;
532 switch (le16_to_cpu(hdr11->frame_ctl) &
533 (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
534 case IEEE80211_FCTL_TODS:
535 memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */
536 memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */
538 case IEEE80211_FCTL_FROMDS:
539 memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */
540 memcpy(hdr + ETH_ALEN, hdr11->addr3, ETH_ALEN); /* SA */
542 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
543 memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */
544 memcpy(hdr + ETH_ALEN, hdr11->addr4, ETH_ALEN); /* SA */
547 memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */
548 memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */
552 hdr[12] = 0; /* priority */
554 hdr[13] = hdr[14] = hdr[15] = 0; /* reserved */
558 static int ieee80211_michael_mic_add(struct sk_buff *skb, int hdr_len, void *priv)
560 struct ieee80211_tkip_data *tkey = priv;
562 struct rtl_80211_hdr_4addr *hdr;
564 hdr = (struct rtl_80211_hdr_4addr *) skb->data;
566 if (skb_tailroom(skb) < 8 || skb->len < hdr_len) {
567 printk(KERN_DEBUG "Invalid packet for Michael MIC add "
568 "(tailroom=%d hdr_len=%d skb->len=%d)\n",
569 skb_tailroom(skb), hdr_len, skb->len);
573 michael_mic_hdr(skb, tkey->tx_hdr);
576 // fix the wpa process with wmm enabled.
577 if (IEEE80211_QOS_HAS_SEQ(le16_to_cpu(hdr->frame_ctl)))
578 tkey->tx_hdr[12] = *(skb->data + hdr_len - 2) & 0x07;
580 pos = skb_put(skb, 8);
582 if (michael_mic(tkey->tx_tfm_michael, &tkey->key[16], tkey->tx_hdr,
583 skb->data + hdr_len, skb->len - 8 - hdr_len, pos))
589 static void ieee80211_michael_mic_failure(struct net_device *dev,
590 struct rtl_80211_hdr_4addr *hdr,
593 union iwreq_data wrqu;
594 struct iw_michaelmicfailure ev;
596 /* TODO: needed parameters: count, keyid, key type, TSC */
597 memset(&ev, 0, sizeof(ev));
598 ev.flags = keyidx & IW_MICFAILURE_KEY_ID;
599 if (hdr->addr1[0] & 0x01)
600 ev.flags |= IW_MICFAILURE_GROUP;
602 ev.flags |= IW_MICFAILURE_PAIRWISE;
603 ev.src_addr.sa_family = ARPHRD_ETHER;
604 memcpy(ev.src_addr.sa_data, hdr->addr2, ETH_ALEN);
605 memset(&wrqu, 0, sizeof(wrqu));
606 wrqu.data.length = sizeof(ev);
607 wireless_send_event(dev, IWEVMICHAELMICFAILURE, &wrqu, (char *) &ev);
610 static int ieee80211_michael_mic_verify(struct sk_buff *skb, int keyidx,
611 int hdr_len, void *priv)
613 struct ieee80211_tkip_data *tkey = priv;
615 struct rtl_80211_hdr_4addr *hdr;
617 hdr = (struct rtl_80211_hdr_4addr *) skb->data;
622 michael_mic_hdr(skb, tkey->rx_hdr);
624 // fix the wpa process with wmm enabled.
625 if (IEEE80211_QOS_HAS_SEQ(le16_to_cpu(hdr->frame_ctl)))
626 tkey->rx_hdr[12] = *(skb->data + hdr_len - 2) & 0x07;
629 if (michael_mic(tkey->rx_tfm_michael, &tkey->key[24], tkey->rx_hdr,
630 skb->data + hdr_len, skb->len - 8 - hdr_len, mic))
632 if (memcmp(mic, skb->data + skb->len - 8, 8) != 0) {
633 struct rtl_80211_hdr_4addr *hdr;
634 hdr = (struct rtl_80211_hdr_4addr *) skb->data;
636 printk(KERN_DEBUG "%s: Michael MIC verification failed for "
637 "MSDU from %pM keyidx=%d\n",
638 skb->dev ? skb->dev->name : "N/A", hdr->addr2,
641 ieee80211_michael_mic_failure(skb->dev, hdr, keyidx);
642 tkey->dot11RSNAStatsTKIPLocalMICFailures++;
647 * Update TSC counters for RX now that the packet verification has
650 tkey->rx_iv32 = tkey->rx_iv32_new;
651 tkey->rx_iv16 = tkey->rx_iv16_new;
653 skb_trim(skb, skb->len - 8);
659 static int ieee80211_tkip_set_key(void *key, int len, u8 *seq, void *priv)
661 struct ieee80211_tkip_data *tkey = priv;
663 struct crypto_hash *tfm = tkey->tx_tfm_michael;
664 struct crypto_blkcipher *tfm2 = tkey->tx_tfm_arc4;
665 struct crypto_hash *tfm3 = tkey->rx_tfm_michael;
666 struct crypto_blkcipher *tfm4 = tkey->rx_tfm_arc4;
668 keyidx = tkey->key_idx;
669 memset(tkey, 0, sizeof(*tkey));
670 tkey->key_idx = keyidx;
671 tkey->tx_tfm_michael = tfm;
672 tkey->tx_tfm_arc4 = tfm2;
673 tkey->rx_tfm_michael = tfm3;
674 tkey->rx_tfm_arc4 = tfm4;
676 if (len == TKIP_KEY_LEN) {
677 memcpy(tkey->key, key, TKIP_KEY_LEN);
679 tkey->tx_iv16 = 1; /* TSC is initialized to 1 */
681 tkey->rx_iv32 = (seq[5] << 24) | (seq[4] << 16) |
682 (seq[3] << 8) | seq[2];
683 tkey->rx_iv16 = (seq[1] << 8) | seq[0];
694 static int ieee80211_tkip_get_key(void *key, int len, u8 *seq, void *priv)
696 struct ieee80211_tkip_data *tkey = priv;
698 if (len < TKIP_KEY_LEN)
703 memcpy(key, tkey->key, TKIP_KEY_LEN);
706 /* Return the sequence number of the last transmitted frame. */
707 u16 iv16 = tkey->tx_iv16;
708 u32 iv32 = tkey->tx_iv32;
713 seq[0] = tkey->tx_iv16;
714 seq[1] = tkey->tx_iv16 >> 8;
715 seq[2] = tkey->tx_iv32;
716 seq[3] = tkey->tx_iv32 >> 8;
717 seq[4] = tkey->tx_iv32 >> 16;
718 seq[5] = tkey->tx_iv32 >> 24;
725 static char *ieee80211_tkip_print_stats(char *p, void *priv)
727 struct ieee80211_tkip_data *tkip = priv;
729 p += sprintf(p, "key[%d] alg=TKIP key_set=%d "
730 "tx_pn=%02x%02x%02x%02x%02x%02x "
731 "rx_pn=%02x%02x%02x%02x%02x%02x "
732 "replays=%d icv_errors=%d local_mic_failures=%d\n",
733 tkip->key_idx, tkip->key_set,
734 (tkip->tx_iv32 >> 24) & 0xff,
735 (tkip->tx_iv32 >> 16) & 0xff,
736 (tkip->tx_iv32 >> 8) & 0xff,
737 tkip->tx_iv32 & 0xff,
738 (tkip->tx_iv16 >> 8) & 0xff,
739 tkip->tx_iv16 & 0xff,
740 (tkip->rx_iv32 >> 24) & 0xff,
741 (tkip->rx_iv32 >> 16) & 0xff,
742 (tkip->rx_iv32 >> 8) & 0xff,
743 tkip->rx_iv32 & 0xff,
744 (tkip->rx_iv16 >> 8) & 0xff,
745 tkip->rx_iv16 & 0xff,
746 tkip->dot11RSNAStatsTKIPReplays,
747 tkip->dot11RSNAStatsTKIPICVErrors,
748 tkip->dot11RSNAStatsTKIPLocalMICFailures);
753 static struct ieee80211_crypto_ops ieee80211_crypt_tkip = {
755 .init = ieee80211_tkip_init,
756 .deinit = ieee80211_tkip_deinit,
757 .encrypt_mpdu = ieee80211_tkip_encrypt,
758 .decrypt_mpdu = ieee80211_tkip_decrypt,
759 .encrypt_msdu = ieee80211_michael_mic_add,
760 .decrypt_msdu = ieee80211_michael_mic_verify,
761 .set_key = ieee80211_tkip_set_key,
762 .get_key = ieee80211_tkip_get_key,
763 .print_stats = ieee80211_tkip_print_stats,
764 .extra_prefix_len = 4 + 4, /* IV + ExtIV */
765 .extra_postfix_len = 8 + 4, /* MIC + ICV */
766 .owner = THIS_MODULE,
769 int __init ieee80211_crypto_tkip_init(void)
771 return ieee80211_register_crypto_ops(&ieee80211_crypt_tkip);
774 void __exit ieee80211_crypto_tkip_exit(void)
776 ieee80211_unregister_crypto_ops(&ieee80211_crypt_tkip);
779 void ieee80211_tkip_null(void)
781 // printk("============>%s()\n", __func__);