| 1 | /*- |
| 2 | * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. The name of the author may not be used to endorse or promote products |
| 14 | * derived from this software without specific prior written permission. |
| 15 | * |
| 16 | * Alternatively, this software may be distributed under the terms of the |
| 17 | * GNU General Public License ("GPL") version 2 as published by the Free |
| 18 | * Software Foundation. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 21 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 22 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 23 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 24 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 25 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 26 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 27 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 28 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 29 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | #include <sys/cdefs.h> |
| 33 | #ifdef __FreeBSD__ |
| 34 | __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_crypto_tkip.c,v 1.10 2005/08/08 18:46:35 sam Exp $" ); |
| 35 | #endif |
| 36 | #ifdef __NetBSD__ |
| 37 | __KERNEL_RCSID(0, "$NetBSD: ieee80211_crypto_tkip.c,v 1.12 2014/10/18 08:33:29 snj Exp $" ); |
| 38 | #endif |
| 39 | |
| 40 | /* |
| 41 | * IEEE 802.11i TKIP crypto support. |
| 42 | * |
| 43 | * Part of this module is derived from similar code in the Host |
| 44 | * AP driver. The code is used with the consent of the author and |
| 45 | * its license is included below. |
| 46 | */ |
| 47 | #include <sys/param.h> |
| 48 | #include <sys/systm.h> |
| 49 | #include <sys/mbuf.h> |
| 50 | #include <sys/malloc.h> |
| 51 | #include <sys/kernel.h> |
| 52 | #include <sys/endian.h> |
| 53 | |
| 54 | #include <sys/socket.h> |
| 55 | |
| 56 | #include <net/if.h> |
| 57 | #include <net/if_ether.h> |
| 58 | #include <net/if_media.h> |
| 59 | |
| 60 | #include <net80211/ieee80211_var.h> |
| 61 | |
| 62 | static void *tkip_attach(struct ieee80211com *, struct ieee80211_key *); |
| 63 | static void tkip_detach(struct ieee80211_key *); |
| 64 | static int tkip_setkey(struct ieee80211_key *); |
| 65 | static int tkip_encap(struct ieee80211_key *, struct mbuf *m, u_int8_t keyid); |
| 66 | static int tkip_enmic(struct ieee80211_key *, struct mbuf *, int); |
| 67 | static int tkip_decap(struct ieee80211_key *, struct mbuf *, int); |
| 68 | static int tkip_demic(struct ieee80211_key *, struct mbuf *, int); |
| 69 | |
| 70 | const struct ieee80211_cipher ieee80211_cipher_tkip = { |
| 71 | .ic_name = "TKIP" , |
| 72 | .ic_cipher = IEEE80211_CIPHER_TKIP, |
| 73 | .ic_header = IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN + |
| 74 | IEEE80211_WEP_EXTIVLEN, |
| 75 | .ic_trailer = IEEE80211_WEP_CRCLEN, |
| 76 | .ic_miclen = IEEE80211_WEP_MICLEN, |
| 77 | .ic_attach = tkip_attach, |
| 78 | .ic_detach = tkip_detach, |
| 79 | .ic_setkey = tkip_setkey, |
| 80 | .ic_encap = tkip_encap, |
| 81 | .ic_decap = tkip_decap, |
| 82 | .ic_enmic = tkip_enmic, |
| 83 | .ic_demic = tkip_demic, |
| 84 | }; |
| 85 | |
| 86 | #define tkip ieee80211_cipher_tkip |
| 87 | |
| 88 | typedef uint8_t u8; |
| 89 | typedef uint16_t u16; |
| 90 | typedef uint32_t __u32; |
| 91 | typedef uint32_t u32; |
| 92 | |
| 93 | struct tkip_ctx { |
| 94 | struct ieee80211com *tc_ic; /* for diagnostics */ |
| 95 | |
| 96 | u16 tx_ttak[5]; |
| 97 | int tx_phase1_done; |
| 98 | u8 tx_rc4key[16]; /* XXX for test module; make locals? */ |
| 99 | |
| 100 | u16 rx_ttak[5]; |
| 101 | int rx_phase1_done; |
| 102 | u8 rx_rc4key[16]; /* XXX for test module; make locals? */ |
| 103 | uint64_t rx_rsc; /* held until MIC verified */ |
| 104 | }; |
| 105 | |
| 106 | static void michael_mic(struct tkip_ctx *, const u8 *key, |
| 107 | struct mbuf *m, u_int off, size_t data_len, |
| 108 | u8 mic[IEEE80211_WEP_MICLEN]); |
| 109 | static int tkip_encrypt(struct tkip_ctx *, struct ieee80211_key *, |
| 110 | struct mbuf *, int hdr_len); |
| 111 | static int tkip_decrypt(struct tkip_ctx *, struct ieee80211_key *, |
| 112 | struct mbuf *, int hdr_len); |
| 113 | |
| 114 | static void * |
| 115 | tkip_attach(struct ieee80211com *ic, struct ieee80211_key *k) |
| 116 | { |
| 117 | struct tkip_ctx *ctx; |
| 118 | |
| 119 | ctx = malloc(sizeof(struct tkip_ctx), M_DEVBUF, M_NOWAIT | M_ZERO); |
| 120 | if (ctx == NULL) { |
| 121 | ic->ic_stats.is_crypto_nomem++; |
| 122 | return NULL; |
| 123 | } |
| 124 | |
| 125 | ctx->tc_ic = ic; |
| 126 | return ctx; |
| 127 | } |
| 128 | |
| 129 | static void |
| 130 | tkip_detach(struct ieee80211_key *k) |
| 131 | { |
| 132 | struct tkip_ctx *ctx = k->wk_private; |
| 133 | |
| 134 | free(ctx, M_DEVBUF); |
| 135 | } |
| 136 | |
| 137 | static int |
| 138 | tkip_setkey(struct ieee80211_key *k) |
| 139 | { |
| 140 | struct tkip_ctx *ctx = k->wk_private; |
| 141 | |
| 142 | if (k->wk_keylen != (128/NBBY)) { |
| 143 | (void) ctx; /* XXX */ |
| 144 | IEEE80211_DPRINTF(ctx->tc_ic, IEEE80211_MSG_CRYPTO, |
| 145 | "%s: Invalid key length %u, expecting %u\n" , |
| 146 | __func__, k->wk_keylen, 128/NBBY); |
| 147 | return 0; |
| 148 | } |
| 149 | k->wk_keytsc = 1; /* TSC starts at 1 */ |
| 150 | return 1; |
| 151 | } |
| 152 | |
| 153 | /* |
| 154 | * Add privacy headers and do any s/w encryption required. |
| 155 | */ |
| 156 | static int |
| 157 | tkip_encap(struct ieee80211_key *k, struct mbuf *m, u_int8_t keyid) |
| 158 | { |
| 159 | struct tkip_ctx *ctx = k->wk_private; |
| 160 | struct ieee80211com *ic = ctx->tc_ic; |
| 161 | u_int8_t *ivp; |
| 162 | int hdrlen; |
| 163 | |
| 164 | /* |
| 165 | * Handle TKIP counter measures requirement. |
| 166 | */ |
| 167 | if (ic->ic_flags & IEEE80211_F_COUNTERM) { |
| 168 | #ifdef IEEE80211_DEBUG |
| 169 | struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); |
| 170 | #endif |
| 171 | |
| 172 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, |
| 173 | "[%s] Discard frame due to countermeasures (%s)\n" , |
| 174 | ether_sprintf(wh->i_addr2), __func__); |
| 175 | ic->ic_stats.is_crypto_tkipcm++; |
| 176 | return 0; |
| 177 | } |
| 178 | hdrlen = ieee80211_hdrspace(ic, mtod(m, void *)); |
| 179 | |
| 180 | /* |
| 181 | * Copy down 802.11 header and add the IV, KeyID, and ExtIV. |
| 182 | */ |
| 183 | M_PREPEND(m, tkip.ic_header, M_NOWAIT); |
| 184 | if (m == NULL) |
| 185 | return 0; |
| 186 | ivp = mtod(m, u_int8_t *); |
| 187 | memmove(ivp, ivp + tkip.ic_header, hdrlen); |
| 188 | ivp += hdrlen; |
| 189 | |
| 190 | ivp[0] = k->wk_keytsc >> 8; /* TSC1 */ |
| 191 | ivp[1] = (ivp[0] | 0x20) & 0x7f; /* WEP seed */ |
| 192 | ivp[2] = k->wk_keytsc >> 0; /* TSC0 */ |
| 193 | ivp[3] = keyid | IEEE80211_WEP_EXTIV; /* KeyID | ExtID */ |
| 194 | ivp[4] = k->wk_keytsc >> 16; /* TSC2 */ |
| 195 | ivp[5] = k->wk_keytsc >> 24; /* TSC3 */ |
| 196 | ivp[6] = k->wk_keytsc >> 32; /* TSC4 */ |
| 197 | ivp[7] = k->wk_keytsc >> 40; /* TSC5 */ |
| 198 | |
| 199 | /* |
| 200 | * Finally, do software encrypt if neeed. |
| 201 | */ |
| 202 | if (k->wk_flags & IEEE80211_KEY_SWCRYPT) { |
| 203 | if (!tkip_encrypt(ctx, k, m, hdrlen)) |
| 204 | return 0; |
| 205 | /* NB: tkip_encrypt handles wk_keytsc */ |
| 206 | } else |
| 207 | k->wk_keytsc++; |
| 208 | |
| 209 | return 1; |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * Add MIC to the frame as needed. |
| 214 | */ |
| 215 | static int |
| 216 | tkip_enmic(struct ieee80211_key *k, struct mbuf *m, int force) |
| 217 | { |
| 218 | struct tkip_ctx *ctx = k->wk_private; |
| 219 | |
| 220 | if (force || (k->wk_flags & IEEE80211_KEY_SWMIC)) { |
| 221 | struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); |
| 222 | struct ieee80211com *ic = ctx->tc_ic; |
| 223 | int hdrlen; |
| 224 | uint8_t mic[IEEE80211_WEP_MICLEN]; |
| 225 | |
| 226 | ic->ic_stats.is_crypto_tkipenmic++; |
| 227 | |
| 228 | hdrlen = ieee80211_hdrspace(ic, wh); |
| 229 | |
| 230 | michael_mic(ctx, k->wk_txmic, |
| 231 | m, hdrlen, m->m_pkthdr.len - hdrlen, mic); |
| 232 | return m_append(m, tkip.ic_miclen, mic); |
| 233 | } |
| 234 | return 1; |
| 235 | } |
| 236 | |
| 237 | static __inline uint64_t |
| 238 | READ_6(uint8_t b0, uint8_t b1, uint8_t b2, uint8_t b3, uint8_t b4, uint8_t b5) |
| 239 | { |
| 240 | uint32_t iv32 = (b0 << 0) | (b1 << 8) | (b2 << 16) | (b3 << 24); |
| 241 | uint16_t iv16 = (b4 << 0) | (b5 << 8); |
| 242 | return (((uint64_t)iv16) << 32) | iv32; |
| 243 | } |
| 244 | |
| 245 | /* |
| 246 | * Validate and strip privacy headers (and trailer) for a |
| 247 | * received frame. If necessary, decrypt the frame using |
| 248 | * the specified key. |
| 249 | */ |
| 250 | static int |
| 251 | tkip_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen) |
| 252 | { |
| 253 | struct tkip_ctx *ctx = k->wk_private; |
| 254 | struct ieee80211com *ic = ctx->tc_ic; |
| 255 | struct ieee80211_frame *wh; |
| 256 | uint8_t *ivp; |
| 257 | |
| 258 | /* |
| 259 | * Header should have extended IV and sequence number; |
| 260 | * verify the former and validate the latter. |
| 261 | */ |
| 262 | wh = mtod(m, struct ieee80211_frame *); |
| 263 | ivp = mtod(m, uint8_t *) + hdrlen; |
| 264 | if ((ivp[IEEE80211_WEP_IVLEN] & IEEE80211_WEP_EXTIV) == 0) { |
| 265 | /* |
| 266 | * No extended IV; discard frame. |
| 267 | */ |
| 268 | IEEE80211_DPRINTF(ctx->tc_ic, IEEE80211_MSG_CRYPTO, |
| 269 | "[%s] missing ExtIV for TKIP cipher\n" , |
| 270 | ether_sprintf(wh->i_addr2)); |
| 271 | ctx->tc_ic->ic_stats.is_rx_tkipformat++; |
| 272 | return 0; |
| 273 | } |
| 274 | /* |
| 275 | * Handle TKIP counter measures requirement. |
| 276 | */ |
| 277 | if (ic->ic_flags & IEEE80211_F_COUNTERM) { |
| 278 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, |
| 279 | "[%s] discard frame due to countermeasures (%s)\n" , |
| 280 | ether_sprintf(wh->i_addr2), __func__); |
| 281 | ic->ic_stats.is_crypto_tkipcm++; |
| 282 | return 0; |
| 283 | } |
| 284 | |
| 285 | ctx->rx_rsc = READ_6(ivp[2], ivp[0], ivp[4], ivp[5], ivp[6], ivp[7]); |
| 286 | if (ctx->rx_rsc <= k->wk_keyrsc) { |
| 287 | /* |
| 288 | * Replay violation; notify upper layer. |
| 289 | */ |
| 290 | ieee80211_notify_replay_failure(ctx->tc_ic, wh, k, ctx->rx_rsc); |
| 291 | ctx->tc_ic->ic_stats.is_rx_tkipreplay++; |
| 292 | return 0; |
| 293 | } |
| 294 | /* |
| 295 | * NB: We can't update the rsc in the key until MIC is verified. |
| 296 | * |
| 297 | * We assume we are not preempted between doing the check above |
| 298 | * and updating wk_keyrsc when stripping the MIC in tkip_demic. |
| 299 | * Otherwise we might process another packet and discard it as |
| 300 | * a replay. |
| 301 | */ |
| 302 | |
| 303 | /* |
| 304 | * Check if the device handled the decrypt in hardware. |
| 305 | * If so we just strip the header; otherwise we need to |
| 306 | * handle the decrypt in software. |
| 307 | */ |
| 308 | if ((k->wk_flags & IEEE80211_KEY_SWCRYPT) && |
| 309 | !tkip_decrypt(ctx, k, m, hdrlen)) |
| 310 | return 0; |
| 311 | |
| 312 | /* |
| 313 | * Copy up 802.11 header and strip crypto bits. |
| 314 | */ |
| 315 | memmove(mtod(m, uint8_t *) + tkip.ic_header, mtod(m, void *), hdrlen); |
| 316 | m_adj(m, tkip.ic_header); |
| 317 | m_adj(m, -tkip.ic_trailer); |
| 318 | |
| 319 | return 1; |
| 320 | } |
| 321 | |
| 322 | /* |
| 323 | * Verify and strip MIC from the frame. |
| 324 | */ |
| 325 | static int |
| 326 | tkip_demic(struct ieee80211_key *k, struct mbuf *m, int force) |
| 327 | { |
| 328 | struct tkip_ctx *ctx = k->wk_private; |
| 329 | |
| 330 | if (force || (k->wk_flags & IEEE80211_KEY_SWMIC)) { |
| 331 | struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); |
| 332 | struct ieee80211com *ic = ctx->tc_ic; |
| 333 | int hdrlen = ieee80211_hdrspace(ic, wh); |
| 334 | u8 mic[IEEE80211_WEP_MICLEN]; |
| 335 | u8 mic0[IEEE80211_WEP_MICLEN]; |
| 336 | |
| 337 | ic->ic_stats.is_crypto_tkipdemic++; |
| 338 | |
| 339 | michael_mic(ctx, k->wk_rxmic, |
| 340 | m, hdrlen, m->m_pkthdr.len - (hdrlen + tkip.ic_miclen), |
| 341 | mic); |
| 342 | m_copydata(m, m->m_pkthdr.len - tkip.ic_miclen, |
| 343 | tkip.ic_miclen, mic0); |
| 344 | if (memcmp(mic, mic0, tkip.ic_miclen)) { |
| 345 | /* NB: 802.11 layer handles statistic and debug msg */ |
| 346 | ieee80211_notify_michael_failure(ic, wh, |
| 347 | k->wk_rxkeyix != IEEE80211_KEYIX_NONE ? |
| 348 | k->wk_rxkeyix : k->wk_keyix); |
| 349 | return 0; |
| 350 | } |
| 351 | } |
| 352 | /* |
| 353 | * Strip MIC from the tail. |
| 354 | */ |
| 355 | m_adj(m, -tkip.ic_miclen); |
| 356 | |
| 357 | /* |
| 358 | * Ok to update rsc now that MIC has been verified. |
| 359 | */ |
| 360 | k->wk_keyrsc = ctx->rx_rsc; |
| 361 | |
| 362 | return 1; |
| 363 | } |
| 364 | |
| 365 | /* |
| 366 | * Host AP crypt: host-based TKIP encryption implementation for Host AP driver |
| 367 | * |
| 368 | * Copyright (c) 2003-2004, Jouni Malinen <jkmaline@cc.hut.fi> |
| 369 | * |
| 370 | * This program is free software; you can redistribute it and/or modify |
| 371 | * it under the terms of the GNU General Public License version 2 as |
| 372 | * published by the Free Software Foundation. See README and COPYING for |
| 373 | * more details. |
| 374 | * |
| 375 | * Alternatively, this software may be distributed under the terms of BSD |
| 376 | * license. |
| 377 | */ |
| 378 | |
| 379 | static const __u32 crc32_table[256] = { |
| 380 | 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, |
| 381 | 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L, |
| 382 | 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, |
| 383 | 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, |
| 384 | 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L, |
| 385 | 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L, |
| 386 | 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, |
| 387 | 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL, |
| 388 | 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L, |
| 389 | 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL, |
| 390 | 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, |
| 391 | 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, |
| 392 | 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L, |
| 393 | 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL, |
| 394 | 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, |
| 395 | 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L, |
| 396 | 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL, |
| 397 | 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L, |
| 398 | 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, |
| 399 | 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, |
| 400 | 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL, |
| 401 | 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, |
| 402 | 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L, |
| 403 | 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL, |
| 404 | 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, |
| 405 | 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L, |
| 406 | 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, |
| 407 | 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, |
| 408 | 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L, |
| 409 | 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, |
| 410 | 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, |
| 411 | 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L, |
| 412 | 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L, |
| 413 | 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL, |
| 414 | 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, |
| 415 | 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, |
| 416 | 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL, |
| 417 | 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L, |
| 418 | 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, |
| 419 | 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L, |
| 420 | 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL, |
| 421 | 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L, |
| 422 | 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, |
| 423 | 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, |
| 424 | 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L, |
| 425 | 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L, |
| 426 | 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, |
| 427 | 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L, |
| 428 | 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L, |
| 429 | 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L, |
| 430 | 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, |
| 431 | 0x2d02ef8dL |
| 432 | }; |
| 433 | |
| 434 | static __inline u16 RotR1(u16 val) |
| 435 | { |
| 436 | return (val >> 1) | (val << 15); |
| 437 | } |
| 438 | |
| 439 | static __inline u8 Lo8(u16 val) |
| 440 | { |
| 441 | return val & 0xff; |
| 442 | } |
| 443 | |
| 444 | static __inline u8 Hi8(u16 val) |
| 445 | { |
| 446 | return val >> 8; |
| 447 | } |
| 448 | |
| 449 | static __inline u16 Lo16(u32 val) |
| 450 | { |
| 451 | return val & 0xffff; |
| 452 | } |
| 453 | |
| 454 | static __inline u16 Hi16(u32 val) |
| 455 | { |
| 456 | return val >> 16; |
| 457 | } |
| 458 | |
| 459 | static __inline u16 Mk16(u8 hi, u8 lo) |
| 460 | { |
| 461 | return lo | (((u16) hi) << 8); |
| 462 | } |
| 463 | |
| 464 | static __inline u16 Mk16_le(const u16 *v) |
| 465 | { |
| 466 | return le16toh(*v); |
| 467 | } |
| 468 | |
| 469 | static const u16 Sbox[256] = { |
| 470 | 0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154, |
| 471 | 0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A, |
| 472 | 0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B, |
| 473 | 0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B, |
| 474 | 0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F, |
| 475 | 0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F, |
| 476 | 0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5, |
| 477 | 0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F, |
| 478 | 0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB, |
| 479 | 0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397, |
| 480 | 0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED, |
| 481 | 0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A, |
| 482 | 0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194, |
| 483 | 0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3, |
| 484 | 0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104, |
| 485 | 0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D, |
| 486 | 0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39, |
| 487 | 0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695, |
| 488 | 0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83, |
| 489 | 0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76, |
| 490 | 0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4, |
| 491 | 0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B, |
| 492 | 0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0, |
| 493 | 0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018, |
| 494 | 0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751, |
| 495 | 0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85, |
| 496 | 0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12, |
| 497 | 0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9, |
| 498 | 0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7, |
| 499 | 0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A, |
| 500 | 0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8, |
| 501 | 0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A, |
| 502 | }; |
| 503 | |
| 504 | static __inline u16 _S_(u16 v) |
| 505 | { |
| 506 | u16 t = Sbox[Hi8(v)]; |
| 507 | return Sbox[Lo8(v)] ^ ((t << 8) | (t >> 8)); |
| 508 | } |
| 509 | |
| 510 | #define PHASE1_LOOP_COUNT 8 |
| 511 | |
| 512 | static void tkip_mixing_phase1(u16 *TTAK, const u8 *TK, const u8 *TA, u32 IV32) |
| 513 | { |
| 514 | int i, j; |
| 515 | |
| 516 | /* Initialize the 80-bit TTAK from TSC (IV32) and TA[0..5] */ |
| 517 | TTAK[0] = Lo16(IV32); |
| 518 | TTAK[1] = Hi16(IV32); |
| 519 | TTAK[2] = Mk16(TA[1], TA[0]); |
| 520 | TTAK[3] = Mk16(TA[3], TA[2]); |
| 521 | TTAK[4] = Mk16(TA[5], TA[4]); |
| 522 | |
| 523 | for (i = 0; i < PHASE1_LOOP_COUNT; i++) { |
| 524 | j = 2 * (i & 1); |
| 525 | TTAK[0] += _S_(TTAK[4] ^ Mk16(TK[1 + j], TK[0 + j])); |
| 526 | TTAK[1] += _S_(TTAK[0] ^ Mk16(TK[5 + j], TK[4 + j])); |
| 527 | TTAK[2] += _S_(TTAK[1] ^ Mk16(TK[9 + j], TK[8 + j])); |
| 528 | TTAK[3] += _S_(TTAK[2] ^ Mk16(TK[13 + j], TK[12 + j])); |
| 529 | TTAK[4] += _S_(TTAK[3] ^ Mk16(TK[1 + j], TK[0 + j])) + i; |
| 530 | } |
| 531 | } |
| 532 | |
| 533 | #ifndef _BYTE_ORDER |
| 534 | #error "Don't know native byte order" |
| 535 | #endif |
| 536 | |
| 537 | static void tkip_mixing_phase2(u8 *WEPSeed, const u8 *TK, const u16 *TTAK, |
| 538 | u16 IV16) |
| 539 | { |
| 540 | /* Make temporary area overlap WEP seed so that the final copy can be |
| 541 | * avoided on little endian hosts. */ |
| 542 | u16 *PPK = (u16 *) &WEPSeed[4]; |
| 543 | |
| 544 | /* Step 1 - make copy of TTAK and bring in TSC */ |
| 545 | PPK[0] = TTAK[0]; |
| 546 | PPK[1] = TTAK[1]; |
| 547 | PPK[2] = TTAK[2]; |
| 548 | PPK[3] = TTAK[3]; |
| 549 | PPK[4] = TTAK[4]; |
| 550 | PPK[5] = TTAK[4] + IV16; |
| 551 | |
| 552 | /* Step 2 - 96-bit bijective mixing using S-box */ |
| 553 | PPK[0] += _S_(PPK[5] ^ Mk16_le((const u16 *) &TK[0])); |
| 554 | PPK[1] += _S_(PPK[0] ^ Mk16_le((const u16 *) &TK[2])); |
| 555 | PPK[2] += _S_(PPK[1] ^ Mk16_le((const u16 *) &TK[4])); |
| 556 | PPK[3] += _S_(PPK[2] ^ Mk16_le((const u16 *) &TK[6])); |
| 557 | PPK[4] += _S_(PPK[3] ^ Mk16_le((const u16 *) &TK[8])); |
| 558 | PPK[5] += _S_(PPK[4] ^ Mk16_le((const u16 *) &TK[10])); |
| 559 | |
| 560 | PPK[0] += RotR1(PPK[5] ^ Mk16_le((const u16 *) &TK[12])); |
| 561 | PPK[1] += RotR1(PPK[0] ^ Mk16_le((const u16 *) &TK[14])); |
| 562 | PPK[2] += RotR1(PPK[1]); |
| 563 | PPK[3] += RotR1(PPK[2]); |
| 564 | PPK[4] += RotR1(PPK[3]); |
| 565 | PPK[5] += RotR1(PPK[4]); |
| 566 | |
| 567 | /* Step 3 - bring in last of TK bits, assign 24-bit WEP IV value |
| 568 | * WEPSeed[0..2] is transmitted as WEP IV */ |
| 569 | WEPSeed[0] = Hi8(IV16); |
| 570 | WEPSeed[1] = (Hi8(IV16) | 0x20) & 0x7F; |
| 571 | WEPSeed[2] = Lo8(IV16); |
| 572 | WEPSeed[3] = Lo8((PPK[5] ^ Mk16_le((const u16 *) &TK[0])) >> 1); |
| 573 | |
| 574 | #if _BYTE_ORDER == _BIG_ENDIAN |
| 575 | { |
| 576 | int i; |
| 577 | for (i = 0; i < 6; i++) |
| 578 | PPK[i] = (PPK[i] << 8) | (PPK[i] >> 8); |
| 579 | } |
| 580 | #endif |
| 581 | } |
| 582 | |
| 583 | static void |
| 584 | wep_encrypt(u8 *key, struct mbuf *m0, u_int off, size_t data_len, |
| 585 | uint8_t icv[IEEE80211_WEP_CRCLEN]) |
| 586 | { |
| 587 | u32 i, j, k, crc; |
| 588 | size_t buflen; |
| 589 | u8 S[256]; |
| 590 | u8 *pos; |
| 591 | struct mbuf *m; |
| 592 | #define S_SWAP(a,b) do { u8 t = S[a]; S[a] = S[b]; S[b] = t; } while(0) |
| 593 | |
| 594 | /* Setup RC4 state */ |
| 595 | for (i = 0; i < 256; i++) |
| 596 | S[i] = i; |
| 597 | j = 0; |
| 598 | for (i = 0; i < 256; i++) { |
| 599 | j = (j + S[i] + key[i & 0x0f]) & 0xff; |
| 600 | S_SWAP(i, j); |
| 601 | } |
| 602 | |
| 603 | /* Compute CRC32 over unencrypted data and apply RC4 to data */ |
| 604 | crc = ~0; |
| 605 | i = j = 0; |
| 606 | m = m0; |
| 607 | pos = mtod(m, uint8_t *) + off; |
| 608 | buflen = m->m_len - off; |
| 609 | for (;;) { |
| 610 | if (buflen > data_len) |
| 611 | buflen = data_len; |
| 612 | data_len -= buflen; |
| 613 | for (k = 0; k < buflen; k++) { |
| 614 | crc = crc32_table[(crc ^ *pos) & 0xff] ^ (crc >> 8); |
| 615 | i = (i + 1) & 0xff; |
| 616 | j = (j + S[i]) & 0xff; |
| 617 | S_SWAP(i, j); |
| 618 | *pos++ ^= S[(S[i] + S[j]) & 0xff]; |
| 619 | } |
| 620 | m = m->m_next; |
| 621 | if (m == NULL) { |
| 622 | IASSERT(data_len == 0, |
| 623 | ("out of buffers with data_len %zu\n" , data_len)); |
| 624 | break; |
| 625 | } |
| 626 | pos = mtod(m, uint8_t *); |
| 627 | buflen = m->m_len; |
| 628 | } |
| 629 | crc = ~crc; |
| 630 | |
| 631 | /* Append little-endian CRC32 and encrypt it to produce ICV */ |
| 632 | icv[0] = crc; |
| 633 | icv[1] = crc >> 8; |
| 634 | icv[2] = crc >> 16; |
| 635 | icv[3] = crc >> 24; |
| 636 | for (k = 0; k < IEEE80211_WEP_CRCLEN; k++) { |
| 637 | i = (i + 1) & 0xff; |
| 638 | j = (j + S[i]) & 0xff; |
| 639 | S_SWAP(i, j); |
| 640 | icv[k] ^= S[(S[i] + S[j]) & 0xff]; |
| 641 | } |
| 642 | } |
| 643 | |
| 644 | static int |
| 645 | wep_decrypt(u8 *key, struct mbuf *m, u_int off, size_t data_len) |
| 646 | { |
| 647 | u32 i, j, k, crc; |
| 648 | u8 S[256]; |
| 649 | u8 *pos, icv[4]; |
| 650 | size_t buflen; |
| 651 | |
| 652 | /* Setup RC4 state */ |
| 653 | for (i = 0; i < 256; i++) |
| 654 | S[i] = i; |
| 655 | j = 0; |
| 656 | for (i = 0; i < 256; i++) { |
| 657 | j = (j + S[i] + key[i & 0x0f]) & 0xff; |
| 658 | S_SWAP(i, j); |
| 659 | } |
| 660 | |
| 661 | /* Apply RC4 to data and compute CRC32 over decrypted data */ |
| 662 | crc = ~0; |
| 663 | i = j = 0; |
| 664 | pos = mtod(m, uint8_t *) + off; |
| 665 | buflen = m->m_len - off; |
| 666 | for (;;) { |
| 667 | if (buflen > data_len) |
| 668 | buflen = data_len; |
| 669 | data_len -= buflen; |
| 670 | for (k = 0; k < buflen; k++) { |
| 671 | i = (i + 1) & 0xff; |
| 672 | j = (j + S[i]) & 0xff; |
| 673 | S_SWAP(i, j); |
| 674 | *pos ^= S[(S[i] + S[j]) & 0xff]; |
| 675 | crc = crc32_table[(crc ^ *pos) & 0xff] ^ (crc >> 8); |
| 676 | pos++; |
| 677 | } |
| 678 | m = m->m_next; |
| 679 | if (m == NULL) { |
| 680 | IASSERT(data_len == 0, |
| 681 | ("out of buffers with data_len %zu\n" , data_len)); |
| 682 | break; |
| 683 | } |
| 684 | pos = mtod(m, uint8_t *); |
| 685 | buflen = m->m_len; |
| 686 | } |
| 687 | crc = ~crc; |
| 688 | |
| 689 | /* Encrypt little-endian CRC32 and verify that it matches with the |
| 690 | * received ICV */ |
| 691 | icv[0] = crc; |
| 692 | icv[1] = crc >> 8; |
| 693 | icv[2] = crc >> 16; |
| 694 | icv[3] = crc >> 24; |
| 695 | for (k = 0; k < 4; k++) { |
| 696 | i = (i + 1) & 0xff; |
| 697 | j = (j + S[i]) & 0xff; |
| 698 | S_SWAP(i, j); |
| 699 | if ((icv[k] ^ S[(S[i] + S[j]) & 0xff]) != *pos++) { |
| 700 | /* ICV mismatch - drop frame */ |
| 701 | return -1; |
| 702 | } |
| 703 | } |
| 704 | |
| 705 | return 0; |
| 706 | } |
| 707 | |
| 708 | |
| 709 | static __inline u32 rotl(u32 val, int bits) |
| 710 | { |
| 711 | return (val << bits) | (val >> (32 - bits)); |
| 712 | } |
| 713 | |
| 714 | |
| 715 | static __inline u32 rotr(u32 val, int bits) |
| 716 | { |
| 717 | return (val >> bits) | (val << (32 - bits)); |
| 718 | } |
| 719 | |
| 720 | |
| 721 | static __inline u32 xswap(u32 val) |
| 722 | { |
| 723 | return ((val & 0x00ff00ff) << 8) | ((val & 0xff00ff00) >> 8); |
| 724 | } |
| 725 | |
| 726 | |
| 727 | #define michael_block(l, r) \ |
| 728 | do { \ |
| 729 | r ^= rotl(l, 17); \ |
| 730 | l += r; \ |
| 731 | r ^= xswap(l); \ |
| 732 | l += r; \ |
| 733 | r ^= rotl(l, 3); \ |
| 734 | l += r; \ |
| 735 | r ^= rotr(l, 2); \ |
| 736 | l += r; \ |
| 737 | } while (0) |
| 738 | |
| 739 | |
| 740 | static __inline u32 get_le32_split(u8 b0, u8 b1, u8 b2, u8 b3) |
| 741 | { |
| 742 | return b0 | (b1 << 8) | (b2 << 16) | (b3 << 24); |
| 743 | } |
| 744 | |
| 745 | static __inline u32 get_le32(const u8 *p) |
| 746 | { |
| 747 | return get_le32_split(p[0], p[1], p[2], p[3]); |
| 748 | } |
| 749 | |
| 750 | |
| 751 | static __inline void put_le32(u8 *p, u32 v) |
| 752 | { |
| 753 | p[0] = v; |
| 754 | p[1] = v >> 8; |
| 755 | p[2] = v >> 16; |
| 756 | p[3] = v >> 24; |
| 757 | } |
| 758 | |
| 759 | /* |
| 760 | * Craft pseudo header used to calculate the MIC. |
| 761 | */ |
| 762 | static void |
| 763 | michael_mic_hdr(const struct ieee80211_frame *wh0, uint8_t hdr[16]) |
| 764 | { |
| 765 | const struct ieee80211_frame_addr4 *wh = |
| 766 | (const struct ieee80211_frame_addr4 *) wh0; |
| 767 | |
| 768 | switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { |
| 769 | case IEEE80211_FC1_DIR_NODS: |
| 770 | IEEE80211_ADDR_COPY(hdr, wh->i_addr1); /* DA */ |
| 771 | IEEE80211_ADDR_COPY(hdr + IEEE80211_ADDR_LEN, wh->i_addr2); |
| 772 | break; |
| 773 | case IEEE80211_FC1_DIR_TODS: |
| 774 | IEEE80211_ADDR_COPY(hdr, wh->i_addr3); /* DA */ |
| 775 | IEEE80211_ADDR_COPY(hdr + IEEE80211_ADDR_LEN, wh->i_addr2); |
| 776 | break; |
| 777 | case IEEE80211_FC1_DIR_FROMDS: |
| 778 | IEEE80211_ADDR_COPY(hdr, wh->i_addr1); /* DA */ |
| 779 | IEEE80211_ADDR_COPY(hdr + IEEE80211_ADDR_LEN, wh->i_addr3); |
| 780 | break; |
| 781 | case IEEE80211_FC1_DIR_DSTODS: |
| 782 | IEEE80211_ADDR_COPY(hdr, wh->i_addr3); /* DA */ |
| 783 | IEEE80211_ADDR_COPY(hdr + IEEE80211_ADDR_LEN, wh->i_addr4); |
| 784 | break; |
| 785 | } |
| 786 | |
| 787 | if (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_QOS) { |
| 788 | const struct ieee80211_qosframe *qwh = |
| 789 | (const struct ieee80211_qosframe *) wh; |
| 790 | hdr[12] = qwh->i_qos[0] & IEEE80211_QOS_TID; |
| 791 | } else |
| 792 | hdr[12] = 0; |
| 793 | hdr[13] = hdr[14] = hdr[15] = 0; /* reserved */ |
| 794 | } |
| 795 | |
| 796 | static void |
| 797 | michael_mic(struct tkip_ctx *ctx, const u8 *key, |
| 798 | struct mbuf *m, u_int off, size_t data_len, |
| 799 | u8 mic[IEEE80211_WEP_MICLEN]) |
| 800 | { |
| 801 | uint8_t hdr[16]; |
| 802 | u32 l, r; |
| 803 | const uint8_t *data; |
| 804 | u_int space; |
| 805 | uint8_t spill[4]; |
| 806 | int nspill = 0; |
| 807 | |
| 808 | michael_mic_hdr(mtod(m, struct ieee80211_frame *), hdr); |
| 809 | |
| 810 | l = get_le32(key); |
| 811 | r = get_le32(key + 4); |
| 812 | |
| 813 | /* Michael MIC pseudo header: DA, SA, 3 x 0, Priority */ |
| 814 | l ^= get_le32(hdr); |
| 815 | michael_block(l, r); |
| 816 | l ^= get_le32(&hdr[4]); |
| 817 | michael_block(l, r); |
| 818 | l ^= get_le32(&hdr[8]); |
| 819 | michael_block(l, r); |
| 820 | l ^= get_le32(&hdr[12]); |
| 821 | michael_block(l, r); |
| 822 | |
| 823 | /* first buffer has special handling */ |
| 824 | data = mtod(m, const uint8_t *) + off; |
| 825 | space = m->m_len - off; |
| 826 | for (;;) { |
| 827 | if (space > data_len) |
| 828 | space = data_len; |
| 829 | if (nspill) { |
| 830 | int n = min(4 - nspill, space); |
| 831 | memcpy(spill + nspill, data, n); |
| 832 | nspill += n; |
| 833 | data += n; |
| 834 | space -= n; |
| 835 | data_len -= n; |
| 836 | if (nspill == 4) { |
| 837 | l ^= get_le32(spill); |
| 838 | michael_block(l, r); |
| 839 | nspill = 0; |
| 840 | } else |
| 841 | goto next; |
| 842 | } |
| 843 | /* collect 32-bit blocks from current buffer */ |
| 844 | while (space >= sizeof(uint32_t)) { |
| 845 | l ^= get_le32(data); |
| 846 | michael_block(l, r); |
| 847 | data += sizeof(uint32_t); |
| 848 | space -= sizeof(uint32_t); |
| 849 | data_len -= sizeof(uint32_t); |
| 850 | } |
| 851 | if (space) { |
| 852 | memcpy(spill, data, space); |
| 853 | nspill = space; |
| 854 | data_len -= space; |
| 855 | } |
| 856 | next: |
| 857 | if (!data_len) |
| 858 | break; |
| 859 | m = m->m_next; |
| 860 | KASSERT(m); |
| 861 | /* |
| 862 | * Setup for next buffer. |
| 863 | */ |
| 864 | data = mtod(m, const uint8_t *); |
| 865 | space = m->m_len; |
| 866 | } |
| 867 | /* Last block and padding (0x5a, 4..7 x 0) */ |
| 868 | spill[nspill++] = 0x5a; |
| 869 | for (; nspill < 4; nspill++) |
| 870 | spill[nspill] = 0; |
| 871 | l ^= get_le32(spill); |
| 872 | michael_block(l, r); |
| 873 | /* l ^= 0; */ |
| 874 | michael_block(l, r); |
| 875 | |
| 876 | put_le32(mic, l); |
| 877 | put_le32(mic + 4, r); |
| 878 | } |
| 879 | |
| 880 | static int |
| 881 | tkip_encrypt(struct tkip_ctx *ctx, struct ieee80211_key *key, |
| 882 | struct mbuf *m, int hdrlen) |
| 883 | { |
| 884 | struct ieee80211_frame *wh; |
| 885 | uint8_t icv[IEEE80211_WEP_CRCLEN]; |
| 886 | |
| 887 | ctx->tc_ic->ic_stats.is_crypto_tkip++; |
| 888 | |
| 889 | wh = mtod(m, struct ieee80211_frame *); |
| 890 | if (!ctx->tx_phase1_done) { |
| 891 | tkip_mixing_phase1(ctx->tx_ttak, key->wk_key, wh->i_addr2, |
| 892 | (u32)(key->wk_keytsc >> 16)); |
| 893 | ctx->tx_phase1_done = 1; |
| 894 | } |
| 895 | tkip_mixing_phase2(ctx->tx_rc4key, key->wk_key, ctx->tx_ttak, |
| 896 | (u16) key->wk_keytsc); |
| 897 | |
| 898 | wep_encrypt(ctx->tx_rc4key, |
| 899 | m, hdrlen + tkip.ic_header, |
| 900 | m->m_pkthdr.len - (hdrlen + tkip.ic_header), |
| 901 | icv); |
| 902 | (void) m_append(m, IEEE80211_WEP_CRCLEN, icv); /* XXX check return */ |
| 903 | |
| 904 | key->wk_keytsc++; |
| 905 | if ((u16)(key->wk_keytsc) == 0) |
| 906 | ctx->tx_phase1_done = 0; |
| 907 | return 1; |
| 908 | } |
| 909 | |
| 910 | static int |
| 911 | tkip_decrypt(struct tkip_ctx *ctx, struct ieee80211_key *key, |
| 912 | struct mbuf *m, int hdrlen) |
| 913 | { |
| 914 | struct ieee80211_frame *wh; |
| 915 | u32 iv32; |
| 916 | u16 iv16; |
| 917 | |
| 918 | ctx->tc_ic->ic_stats.is_crypto_tkip++; |
| 919 | |
| 920 | wh = mtod(m, struct ieee80211_frame *); |
| 921 | /* NB: tkip_decap already verified header and left seq in rx_rsc */ |
| 922 | iv16 = (u16) ctx->rx_rsc; |
| 923 | iv32 = (u32) (ctx->rx_rsc >> 16); |
| 924 | |
| 925 | if (iv32 != (u32)(key->wk_keyrsc >> 16) || !ctx->rx_phase1_done) { |
| 926 | tkip_mixing_phase1(ctx->rx_ttak, key->wk_key, |
| 927 | wh->i_addr2, iv32); |
| 928 | ctx->rx_phase1_done = 1; |
| 929 | } |
| 930 | tkip_mixing_phase2(ctx->rx_rc4key, key->wk_key, ctx->rx_ttak, iv16); |
| 931 | |
| 932 | /* NB: m is unstripped; deduct headers + ICV to get payload */ |
| 933 | if (wep_decrypt(ctx->rx_rc4key, |
| 934 | m, hdrlen + tkip.ic_header, |
| 935 | m->m_pkthdr.len - (hdrlen + tkip.ic_header + tkip.ic_trailer))) { |
| 936 | if (iv32 != (u32)(key->wk_keyrsc >> 16)) { |
| 937 | /* Previously cached Phase1 result was already lost, so |
| 938 | * it needs to be recalculated for the next packet. */ |
| 939 | ctx->rx_phase1_done = 0; |
| 940 | } |
| 941 | IEEE80211_DPRINTF(ctx->tc_ic, IEEE80211_MSG_CRYPTO, |
| 942 | "[%s] TKIP ICV mismatch on decrypt\n" , |
| 943 | ether_sprintf(wh->i_addr2)); |
| 944 | ctx->tc_ic->ic_stats.is_rx_tkipicv++; |
| 945 | return 0; |
| 946 | } |
| 947 | return 1; |
| 948 | } |
| 949 | |
| 950 | IEEE80211_CRYPTO_SETUP(tkip_register) |
| 951 | { |
| 952 | ieee80211_crypto_register(&tkip); |
| 953 | } |
| 954 | |