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/config.h>
13 #include <linux/version.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/slab.h>
17 #include <linux/random.h>
18 #include <linux/skbuff.h>
19 #include <linux/netdevice.h>
20 #include <linux/if_ether.h>
21 #include <linux/if_arp.h>
22 #include <asm/string.h>
24 #include "ieee80211.h"
26 #include <linux/crypto.h>
27 #include <linux/scatterlist.h>
28 #include <linux/crc32.h>
30 MODULE_AUTHOR("Jouni Malinen");
31 MODULE_DESCRIPTION("Host AP crypt: TKIP");
32 MODULE_LICENSE("GPL");
34 struct ieee80211_tkip_data {
35 #define TKIP_KEY_LEN 32
51 u32 dot11RSNAStatsTKIPReplays;
52 u32 dot11RSNAStatsTKIPICVErrors;
53 u32 dot11RSNAStatsTKIPLocalMICFailures;
57 struct crypto_blkcipher *rx_tfm_arc4;
58 struct crypto_hash *rx_tfm_michael;
59 struct crypto_blkcipher *tx_tfm_arc4;
60 struct crypto_hash *tx_tfm_michael;
62 /* scratch buffers for virt_to_page() (crypto API) */
63 u8 rx_hdr[16], tx_hdr[16];
66 static void * ieee80211_tkip_init(int key_idx)
68 struct ieee80211_tkip_data *priv;
70 priv = kmalloc(sizeof(*priv), GFP_ATOMIC);
73 memset(priv, 0, sizeof(*priv));
74 priv->key_idx = key_idx;
76 priv->tx_tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0,
78 if (IS_ERR(priv->tx_tfm_arc4)) {
79 printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
81 priv->tx_tfm_arc4 = NULL;
85 priv->tx_tfm_michael = crypto_alloc_hash("michael_mic", 0,
87 if (IS_ERR(priv->tx_tfm_michael)) {
88 printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
89 "crypto API michael_mic\n");
90 priv->tx_tfm_michael = NULL;
94 priv->rx_tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0,
96 if (IS_ERR(priv->rx_tfm_arc4)) {
97 printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
99 priv->rx_tfm_arc4 = NULL;
103 priv->rx_tfm_michael = crypto_alloc_hash("michael_mic", 0,
105 if (IS_ERR(priv->rx_tfm_michael)) {
106 printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
107 "crypto API michael_mic\n");
108 priv->rx_tfm_michael = NULL;
116 if (priv->tx_tfm_michael)
117 crypto_free_hash(priv->tx_tfm_michael);
118 if (priv->tx_tfm_arc4)
119 crypto_free_blkcipher(priv->tx_tfm_arc4);
120 if (priv->rx_tfm_michael)
121 crypto_free_hash(priv->rx_tfm_michael);
122 if (priv->rx_tfm_arc4)
123 crypto_free_blkcipher(priv->rx_tfm_arc4);
131 static void ieee80211_tkip_deinit(void *priv)
133 struct ieee80211_tkip_data *_priv = priv;
136 if (_priv->tx_tfm_michael)
137 crypto_free_hash(_priv->tx_tfm_michael);
138 if (_priv->tx_tfm_arc4)
139 crypto_free_blkcipher(_priv->tx_tfm_arc4);
140 if (_priv->rx_tfm_michael)
141 crypto_free_hash(_priv->rx_tfm_michael);
142 if (_priv->rx_tfm_arc4)
143 crypto_free_blkcipher(_priv->rx_tfm_arc4);
149 static inline u16 RotR1(u16 val)
151 return (val >> 1) | (val << 15);
155 static inline u8 Lo8(u16 val)
161 static inline u8 Hi8(u16 val)
167 static inline u16 Lo16(u32 val)
173 static inline u16 Hi16(u32 val)
179 static inline u16 Mk16(u8 hi, u8 lo)
181 return lo | (((u16) hi) << 8);
185 static inline u16 Mk16_le(u16 *v)
187 return le16_to_cpu(*v);
191 static const u16 Sbox[256] =
193 0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154,
194 0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A,
195 0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B,
196 0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B,
197 0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F,
198 0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F,
199 0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5,
200 0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F,
201 0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB,
202 0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397,
203 0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED,
204 0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A,
205 0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194,
206 0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3,
207 0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104,
208 0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D,
209 0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39,
210 0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695,
211 0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83,
212 0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76,
213 0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4,
214 0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B,
215 0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0,
216 0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018,
217 0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751,
218 0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85,
219 0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12,
220 0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9,
221 0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7,
222 0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A,
223 0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8,
224 0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A,
228 static inline u16 _S_(u16 v)
230 u16 t = Sbox[Hi8(v)];
231 return Sbox[Lo8(v)] ^ ((t << 8) | (t >> 8));
235 #define PHASE1_LOOP_COUNT 8
238 static void tkip_mixing_phase1(u16 *TTAK, const u8 *TK, const u8 *TA, u32 IV32)
242 /* Initialize the 80-bit TTAK from TSC (IV32) and TA[0..5] */
243 TTAK[0] = Lo16(IV32);
244 TTAK[1] = Hi16(IV32);
245 TTAK[2] = Mk16(TA[1], TA[0]);
246 TTAK[3] = Mk16(TA[3], TA[2]);
247 TTAK[4] = Mk16(TA[5], TA[4]);
249 for (i = 0; i < PHASE1_LOOP_COUNT; i++) {
251 TTAK[0] += _S_(TTAK[4] ^ Mk16(TK[1 + j], TK[0 + j]));
252 TTAK[1] += _S_(TTAK[0] ^ Mk16(TK[5 + j], TK[4 + j]));
253 TTAK[2] += _S_(TTAK[1] ^ Mk16(TK[9 + j], TK[8 + j]));
254 TTAK[3] += _S_(TTAK[2] ^ Mk16(TK[13 + j], TK[12 + j]));
255 TTAK[4] += _S_(TTAK[3] ^ Mk16(TK[1 + j], TK[0 + j])) + i;
260 static void tkip_mixing_phase2(u8 *WEPSeed, const u8 *TK, const u16 *TTAK,
263 /* Make temporary area overlap WEP seed so that the final copy can be
264 * avoided on little endian hosts. */
265 u16 *PPK = (u16 *) &WEPSeed[4];
267 /* Step 1 - make copy of TTAK and bring in TSC */
273 PPK[5] = TTAK[4] + IV16;
275 /* Step 2 - 96-bit bijective mixing using S-box */
276 PPK[0] += _S_(PPK[5] ^ Mk16_le((u16 *) &TK[0]));
277 PPK[1] += _S_(PPK[0] ^ Mk16_le((u16 *) &TK[2]));
278 PPK[2] += _S_(PPK[1] ^ Mk16_le((u16 *) &TK[4]));
279 PPK[3] += _S_(PPK[2] ^ Mk16_le((u16 *) &TK[6]));
280 PPK[4] += _S_(PPK[3] ^ Mk16_le((u16 *) &TK[8]));
281 PPK[5] += _S_(PPK[4] ^ Mk16_le((u16 *) &TK[10]));
283 PPK[0] += RotR1(PPK[5] ^ Mk16_le((u16 *) &TK[12]));
284 PPK[1] += RotR1(PPK[0] ^ Mk16_le((u16 *) &TK[14]));
285 PPK[2] += RotR1(PPK[1]);
286 PPK[3] += RotR1(PPK[2]);
287 PPK[4] += RotR1(PPK[3]);
288 PPK[5] += RotR1(PPK[4]);
290 /* Step 3 - bring in last of TK bits, assign 24-bit WEP IV value
291 * 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);
300 for (i = 0; i < 6; i++)
301 PPK[i] = (PPK[i] << 8) | (PPK[i] >> 8);
307 static int ieee80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
309 struct ieee80211_tkip_data *tkey = priv;
312 struct ieee80211_hdr_4addr *hdr;
313 cb_desc *tcb_desc = (cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
314 struct blkcipher_desc desc = {.tfm = tkey->tx_tfm_arc4};
318 struct scatterlist sg;
320 if (skb_headroom(skb) < 8 || skb_tailroom(skb) < 4 ||
324 hdr = (struct ieee80211_hdr_4addr *) skb->data;
326 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);
336 tkey->tx_phase1_done = 1;
339 len = skb->len - hdr_len;
340 pos = skb_push(skb, 8);
341 memmove(pos, pos + 8, hdr_len);
344 if (tcb_desc->bHwSec)
346 *pos++ = Hi8(tkey->tx_iv16);
347 *pos++ = (Hi8(tkey->tx_iv16) | 0x20) & 0x7F;
348 *pos++ = Lo8(tkey->tx_iv16);
357 *pos++ = (tkey->key_idx << 6) | (1 << 5) /* Ext IV included */;
358 *pos++ = tkey->tx_iv32 & 0xff;
359 *pos++ = (tkey->tx_iv32 >> 8) & 0xff;
360 *pos++ = (tkey->tx_iv32 >> 16) & 0xff;
361 *pos++ = (tkey->tx_iv32 >> 24) & 0xff;
363 if (!tcb_desc->bHwSec)
365 icv = skb_put(skb, 4);
366 crc = ~crc32_le(~0, pos, len);
371 crypto_blkcipher_setkey(tkey->tx_tfm_arc4, rc4key, 16);
372 sg_init_one(&sg, pos, len+4);
373 ret= crypto_blkcipher_encrypt(&desc, &sg, &sg, len + 4);
377 if (tkey->tx_iv16 == 0) {
378 tkey->tx_phase1_done = 0;
382 if (!tcb_desc->bHwSec)
390 static int ieee80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
392 struct ieee80211_tkip_data *tkey = priv;
396 struct ieee80211_hdr_4addr *hdr;
397 cb_desc *tcb_desc = (cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
398 struct blkcipher_desc desc = {.tfm = tkey->rx_tfm_arc4};
402 struct scatterlist sg;
404 if (skb->len < hdr_len + 8 + 4)
407 hdr = (struct ieee80211_hdr_4addr *) skb->data;
408 pos = skb->data + hdr_len;
410 if (!(keyidx & (1 << 5))) {
411 if (net_ratelimit()) {
412 printk(KERN_DEBUG "TKIP: received packet without ExtIV"
413 " flag from %pM\n", hdr->addr2);
418 if (tkey->key_idx != keyidx) {
419 printk(KERN_DEBUG "TKIP: RX tkey->key_idx=%d frame "
420 "keyidx=%d priv=%p\n", tkey->key_idx, keyidx, priv);
423 if (!tkey->key_set) {
424 if (net_ratelimit()) {
425 printk(KERN_DEBUG "TKIP: received packet from %pM"
426 " with keyid=%d that does not have a configured"
427 " key\n", hdr->addr2, keyidx);
431 iv16 = (pos[0] << 8) | pos[2];
432 iv32 = pos[4] | (pos[5] << 8) | (pos[6] << 16) | (pos[7] << 24);
435 if (!tcb_desc->bHwSec)
437 if (iv32 < tkey->rx_iv32 ||
438 (iv32 == tkey->rx_iv32 && iv16 <= tkey->rx_iv16)) {
439 if (net_ratelimit()) {
440 printk(KERN_DEBUG "TKIP: replay detected: STA=%pM"
441 " previous TSC %08x%04x received TSC "
442 "%08x%04x\n", hdr->addr2,
443 tkey->rx_iv32, tkey->rx_iv16, iv32, iv16);
445 tkey->dot11RSNAStatsTKIPReplays++;
449 if (iv32 != tkey->rx_iv32 || !tkey->rx_phase1_done) {
450 tkip_mixing_phase1(tkey->rx_ttak, tkey->key, hdr->addr2, iv32);
451 tkey->rx_phase1_done = 1;
453 tkip_mixing_phase2(rc4key, tkey->key, tkey->rx_ttak, iv16);
455 plen = skb->len - hdr_len - 12;
457 crypto_blkcipher_setkey(tkey->rx_tfm_arc4, rc4key, 16);
458 sg_init_one(&sg, pos, plen+4);
460 if (crypto_blkcipher_decrypt(&desc, &sg, &sg, plen + 4)) {
461 if (net_ratelimit()) {
462 printk(KERN_DEBUG ": TKIP: failed to decrypt "
463 "received packet from %pM\n",
469 crc = ~crc32_le(~0, pos, plen);
475 if (memcmp(icv, pos + plen, 4) != 0) {
476 if (iv32 != tkey->rx_iv32) {
477 /* Previously cached Phase1 result was already lost, so
478 * it needs to be recalculated for the next packet. */
479 tkey->rx_phase1_done = 0;
481 if (net_ratelimit()) {
482 printk(KERN_DEBUG "TKIP: ICV error detected: STA="
483 "%pM\n", hdr->addr2);
485 tkey->dot11RSNAStatsTKIPICVErrors++;
491 /* 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 ieee80211_hdr_4addr *hdr11;
531 hdr11 = (struct ieee80211_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 ieee80211_hdr_4addr *hdr;
564 hdr = (struct ieee80211_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;
581 pos = skb_put(skb, 8);
583 if (michael_mic(tkey->tx_tfm_michael, &tkey->key[16], tkey->tx_hdr,
584 skb->data + hdr_len, skb->len - 8 - hdr_len, pos))
590 static void ieee80211_michael_mic_failure(struct net_device *dev,
591 struct ieee80211_hdr_4addr *hdr,
594 union iwreq_data wrqu;
595 struct iw_michaelmicfailure ev;
597 /* TODO: needed parameters: count, keyid, key type, TSC */
598 memset(&ev, 0, sizeof(ev));
599 ev.flags = keyidx & IW_MICFAILURE_KEY_ID;
600 if (hdr->addr1[0] & 0x01)
601 ev.flags |= IW_MICFAILURE_GROUP;
603 ev.flags |= IW_MICFAILURE_PAIRWISE;
604 ev.src_addr.sa_family = ARPHRD_ETHER;
605 memcpy(ev.src_addr.sa_data, hdr->addr2, ETH_ALEN);
606 memset(&wrqu, 0, sizeof(wrqu));
607 wrqu.data.length = sizeof(ev);
608 wireless_send_event(dev, IWEVMICHAELMICFAILURE, &wrqu, (char *) &ev);
611 static int ieee80211_michael_mic_verify(struct sk_buff *skb, int keyidx,
612 int hdr_len, void *priv)
614 struct ieee80211_tkip_data *tkey = priv;
616 struct ieee80211_hdr_4addr *hdr;
618 hdr = (struct ieee80211_hdr_4addr *) skb->data;
623 michael_mic_hdr(skb, tkey->rx_hdr);
625 // fix the wpa process with wmm enabled.
626 if(IEEE80211_QOS_HAS_SEQ(le16_to_cpu(hdr->frame_ctl))) {
627 tkey->rx_hdr[12] = *(skb->data + hdr_len - 2) & 0x07;
631 if (michael_mic(tkey->rx_tfm_michael, &tkey->key[24], tkey->rx_hdr,
632 skb->data + hdr_len, skb->len - 8 - hdr_len, mic))
634 if (memcmp(mic, skb->data + skb->len - 8, 8) != 0) {
635 struct ieee80211_hdr_4addr *hdr;
636 hdr = (struct ieee80211_hdr_4addr *) skb->data;
637 printk(KERN_DEBUG "%s: Michael MIC verification failed for "
638 "MSDU from %pM keyidx=%d\n",
639 skb->dev ? skb->dev->name : "N/A", hdr->addr2,
642 ieee80211_michael_mic_failure(skb->dev, hdr, keyidx);
643 tkey->dot11RSNAStatsTKIPLocalMICFailures++;
647 /* Update TSC counters for RX now that the packet verification has
649 tkey->rx_iv32 = tkey->rx_iv32_new;
650 tkey->rx_iv16 = tkey->rx_iv16_new;
652 skb_trim(skb, skb->len - 8);
658 static int ieee80211_tkip_set_key(void *key, int len, u8 *seq, void *priv)
660 struct ieee80211_tkip_data *tkey = priv;
662 struct crypto_hash *tfm = tkey->tx_tfm_michael;
663 struct crypto_blkcipher *tfm2 = tkey->tx_tfm_arc4;
664 struct crypto_hash *tfm3 = tkey->rx_tfm_michael;
665 struct crypto_blkcipher *tfm4 = tkey->rx_tfm_arc4;
667 keyidx = tkey->key_idx;
668 memset(tkey, 0, sizeof(*tkey));
669 tkey->key_idx = keyidx;
670 tkey->tx_tfm_michael = tfm;
671 tkey->tx_tfm_arc4 = tfm2;
672 tkey->rx_tfm_michael = tfm3;
673 tkey->rx_tfm_arc4 = tfm4;
675 if (len == TKIP_KEY_LEN) {
676 memcpy(tkey->key, key, TKIP_KEY_LEN);
678 tkey->tx_iv16 = 1; /* TSC is initialized to 1 */
680 tkey->rx_iv32 = (seq[5] << 24) | (seq[4] << 16) |
681 (seq[3] << 8) | seq[2];
682 tkey->rx_iv16 = (seq[1] << 8) | seq[0];
693 static int ieee80211_tkip_get_key(void *key, int len, u8 *seq, void *priv)
695 struct ieee80211_tkip_data *tkey = priv;
697 if (len < TKIP_KEY_LEN)
702 memcpy(key, tkey->key, TKIP_KEY_LEN);
705 /* Return the sequence number of the last transmitted frame. */
706 u16 iv16 = tkey->tx_iv16;
707 u32 iv32 = tkey->tx_iv32;
711 seq[0] = tkey->tx_iv16;
712 seq[1] = tkey->tx_iv16 >> 8;
713 seq[2] = tkey->tx_iv32;
714 seq[3] = tkey->tx_iv32 >> 8;
715 seq[4] = tkey->tx_iv32 >> 16;
716 seq[5] = tkey->tx_iv32 >> 24;
723 static char * ieee80211_tkip_print_stats(char *p, void *priv)
725 struct ieee80211_tkip_data *tkip = priv;
726 p += sprintf(p, "key[%d] alg=TKIP key_set=%d "
727 "tx_pn=%02x%02x%02x%02x%02x%02x "
728 "rx_pn=%02x%02x%02x%02x%02x%02x "
729 "replays=%d icv_errors=%d local_mic_failures=%d\n",
730 tkip->key_idx, tkip->key_set,
731 (tkip->tx_iv32 >> 24) & 0xff,
732 (tkip->tx_iv32 >> 16) & 0xff,
733 (tkip->tx_iv32 >> 8) & 0xff,
734 tkip->tx_iv32 & 0xff,
735 (tkip->tx_iv16 >> 8) & 0xff,
736 tkip->tx_iv16 & 0xff,
737 (tkip->rx_iv32 >> 24) & 0xff,
738 (tkip->rx_iv32 >> 16) & 0xff,
739 (tkip->rx_iv32 >> 8) & 0xff,
740 tkip->rx_iv32 & 0xff,
741 (tkip->rx_iv16 >> 8) & 0xff,
742 tkip->rx_iv16 & 0xff,
743 tkip->dot11RSNAStatsTKIPReplays,
744 tkip->dot11RSNAStatsTKIPICVErrors,
745 tkip->dot11RSNAStatsTKIPLocalMICFailures);
750 static struct ieee80211_crypto_ops ieee80211_crypt_tkip = {
752 .init = ieee80211_tkip_init,
753 .deinit = ieee80211_tkip_deinit,
754 .encrypt_mpdu = ieee80211_tkip_encrypt,
755 .decrypt_mpdu = ieee80211_tkip_decrypt,
756 .encrypt_msdu = ieee80211_michael_mic_add,
757 .decrypt_msdu = ieee80211_michael_mic_verify,
758 .set_key = ieee80211_tkip_set_key,
759 .get_key = ieee80211_tkip_get_key,
760 .print_stats = ieee80211_tkip_print_stats,
761 .extra_prefix_len = 4 + 4, /* IV + ExtIV */
762 .extra_postfix_len = 8 + 4, /* MIC + ICV */
763 .owner = THIS_MODULE,
766 int __init ieee80211_crypto_tkip_init(void)
768 return ieee80211_register_crypto_ops(&ieee80211_crypt_tkip);
771 void __exit ieee80211_crypto_tkip_exit(void)
773 ieee80211_unregister_crypto_ops(&ieee80211_crypt_tkip);
776 void ieee80211_tkip_null(void)
778 // printk("============>%s()\n", __FUNCTION__);