1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2005-2011 Pawel Jakub Dawidek <pawel@dawidek.net>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <sys/linker.h>
33 #include <sys/module.h>
34 #include <sys/lock.h>
35 #include <sys/mutex.h>
36 #include <sys/bio.h>
37 #include <sys/sysctl.h>
38 #include <sys/kthread.h>
39 #include <sys/proc.h>
40 #include <sys/sched.h>
41 #include <sys/smp.h>
42 #include <sys/vnode.h>
43
44 #include <vm/uma.h>
45
46 #include <geom/geom.h>
47 #include <geom/geom_dbg.h>
48 #include <geom/eli/g_eli.h>
49 #include <geom/eli/pkcs5v2.h>
50
51 /*
52 * The data layout description when integrity verification is configured.
53 *
54 * One of the most important assumption here is that authenticated data and its
55 * HMAC has to be stored in the same place (namely in the same sector) to make
56 * it work reliable.
57 * The problem is that file systems work only with sectors that are multiple of
58 * 512 bytes and a power of two number.
59 * My idea to implement it is as follows.
60 * Let's store HMAC in sector. This is a must. This leaves us 480 bytes for
61 * data. We can't use that directly (ie. we can't create provider with 480 bytes
62 * sector size). We need another sector from where we take only 32 bytes of data
63 * and we store HMAC of this data as well. This takes two sectors from the
64 * original provider at the input and leaves us one sector of authenticated data
65 * at the output. Not very efficient, but you got the idea.
66 * Now, let's assume, we want to create provider with 4096 bytes sector.
67 * To output 4096 bytes of authenticated data we need 8x480 plus 1x256, so we
68 * need nine 512-bytes sectors at the input to get one 4096-bytes sector at the
69 * output. That's better. With 4096 bytes sector we can use 89% of size of the
70 * original provider. I find it as an acceptable cost.
71 * The reliability comes from the fact, that every HMAC stored inside the sector
72 * is calculated only for the data in the same sector, so its impossible to
73 * write new data and leave old HMAC or vice versa.
74 *
75 * And here is the picture:
76 *
77 * da0: +----+----+ +----+----+ +----+----+ +----+----+ +----+----+ +----+----+ +----+----+ +----+----+ +----+-----+
78 * |32b |480b| |32b |480b| |32b |480b| |32b |480b| |32b |480b| |32b |480b| |32b |480b| |32b |480b| |32b |256b |
79 * |HMAC|Data| |HMAC|Data| |HMAC|Data| |HMAC|Data| |HMAC|Data| |HMAC|Data| |HMAC|Data| |HMAC|Data| |HMAC|Data |
80 * +----+----+ +----+----+ +----+----+ +----+----+ +----+----+ +----+----+ +----+----+ +----+----+ +----+-----+
81 * |512 bytes| |512 bytes| |512 bytes| |512 bytes| |512 bytes| |512 bytes| |512 bytes| |512 bytes| |288 bytes |
82 * +---------+ +---------+ +---------+ +---------+ +---------+ +---------+ +---------+ +---------+ |224 unused|
83 * +----------+
84 * da0.eli: +----+----+----+----+----+----+----+----+----+
85 * |480b|480b|480b|480b|480b|480b|480b|480b|256b|
86 * +----+----+----+----+----+----+----+----+----+
87 * | 4096 bytes |
88 * +--------------------------------------------+
89 *
90 * PS. You can use any sector size with geli(8). My example is using 4kB,
91 * because it's most efficient. For 8kB sectors you need 2 extra sectors,
92 * so the cost is the same as for 4kB sectors.
93 */
94
95 /*
96 * Code paths:
97 * BIO_READ:
98 * g_eli_start -> g_eli_auth_read -> g_io_request -> g_eli_read_done -> g_eli_auth_run -> g_eli_auth_read_done -> g_io_deliver
99 * BIO_WRITE:
100 * g_eli_start -> g_eli_auth_run -> g_eli_auth_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver
101 */
102
103 /*
104 * Here we generate key for HMAC. Every sector has its own HMAC key, so it is
105 * not possible to copy sectors.
106 * We cannot depend on fact, that every sector has its own IV, because different
107 * IV doesn't change HMAC, when we use encrypt-then-authenticate method.
108 */
109 static void
g_eli_auth_keygen(struct g_eli_softc * sc,off_t offset,u_char * key)110 g_eli_auth_keygen(struct g_eli_softc *sc, off_t offset, u_char *key)
111 {
112 SHA256_CTX ctx;
113
114 /* Copy precalculated SHA256 context. */
115 bcopy(&sc->sc_akeyctx, &ctx, sizeof(ctx));
116 SHA256_Update(&ctx, (uint8_t *)&offset, sizeof(offset));
117 SHA256_Final(key, &ctx);
118 }
119
120 /*
121 * The function is called after we read and decrypt data.
122 *
123 * g_eli_start -> g_eli_auth_read -> g_io_request -> g_eli_read_done -> g_eli_auth_run -> G_ELI_AUTH_READ_DONE -> g_io_deliver
124 */
125 static int
g_eli_auth_read_done(struct cryptop * crp)126 g_eli_auth_read_done(struct cryptop *crp)
127 {
128 struct g_eli_softc *sc;
129 struct bio *bp;
130
131 if (crp->crp_etype == EAGAIN) {
132 if (g_eli_crypto_rerun(crp) == 0)
133 return (0);
134 }
135 bp = (struct bio *)crp->crp_opaque;
136 bp->bio_inbed++;
137 sc = bp->bio_to->geom->softc;
138 if (crp->crp_etype == 0) {
139 bp->bio_completed += crp->crp_payload_length;
140 G_ELI_DEBUG(3, "Crypto READ request done (%d/%d) (add=%d completed=%jd).",
141 bp->bio_inbed, bp->bio_children, crp->crp_payload_length, (intmax_t)bp->bio_completed);
142 } else {
143 u_int nsec, decr_secsize, encr_secsize, rel_sec;
144 int *errorp;
145
146 /* Sectorsize of decrypted provider eg. 4096. */
147 decr_secsize = bp->bio_to->sectorsize;
148 /* The real sectorsize of encrypted provider, eg. 512. */
149 encr_secsize =
150 LIST_FIRST(&sc->sc_geom->consumer)->provider->sectorsize;
151 /* Number of sectors from decrypted provider, eg. 2. */
152 nsec = bp->bio_length / decr_secsize;
153 /* Number of sectors from encrypted provider, eg. 18. */
154 nsec = (nsec * sc->sc_bytes_per_sector) / encr_secsize;
155 /* Which relative sector this request decrypted. */
156 rel_sec = ((crp->crp_buf.cb_buf + crp->crp_payload_start) -
157 (char *)bp->bio_driver2) / encr_secsize;
158
159 errorp = (int *)((char *)bp->bio_driver2 + encr_secsize * nsec +
160 sizeof(int) * rel_sec);
161 *errorp = crp->crp_etype;
162 G_ELI_DEBUG(1,
163 "Crypto READ request failed (%d/%d) error=%d.",
164 bp->bio_inbed, bp->bio_children, crp->crp_etype);
165 if (bp->bio_error == 0 || bp->bio_error == EINTEGRITY)
166 bp->bio_error = crp->crp_etype == EBADMSG ?
167 EINTEGRITY : crp->crp_etype;
168 }
169 if (crp->crp_cipher_key != NULL)
170 g_eli_key_drop(sc, __DECONST(void *, crp->crp_cipher_key));
171 crypto_freereq(crp);
172 /*
173 * Do we have all sectors already?
174 */
175 if (bp->bio_inbed < bp->bio_children)
176 return (0);
177
178 if (bp->bio_error == 0) {
179 u_int i, lsec, nsec, data_secsize, decr_secsize, encr_secsize;
180 u_char *srcdata, *dstdata;
181
182 /* Sectorsize of decrypted provider eg. 4096. */
183 decr_secsize = bp->bio_to->sectorsize;
184 /* The real sectorsize of encrypted provider, eg. 512. */
185 encr_secsize = LIST_FIRST(&sc->sc_geom->consumer)->provider->sectorsize;
186 /* Number of data bytes in one encrypted sector, eg. 480. */
187 data_secsize = sc->sc_data_per_sector;
188 /* Number of sectors from decrypted provider, eg. 2. */
189 nsec = bp->bio_length / decr_secsize;
190 /* Number of sectors from encrypted provider, eg. 18. */
191 nsec = (nsec * sc->sc_bytes_per_sector) / encr_secsize;
192 /* Last sector number in every big sector, eg. 9. */
193 lsec = sc->sc_bytes_per_sector / encr_secsize;
194
195 srcdata = bp->bio_driver2;
196 dstdata = bp->bio_data;
197
198 for (i = 1; i <= nsec; i++) {
199 data_secsize = sc->sc_data_per_sector;
200 if ((i % lsec) == 0)
201 data_secsize = decr_secsize % data_secsize;
202 bcopy(srcdata + sc->sc_alen, dstdata, data_secsize);
203 srcdata += encr_secsize;
204 dstdata += data_secsize;
205 }
206 } else if (bp->bio_error == EINTEGRITY) {
207 u_int i, lsec, nsec, data_secsize, decr_secsize, encr_secsize;
208 int *errorp;
209 off_t coroff, corsize, dstoff;
210
211 /* Sectorsize of decrypted provider eg. 4096. */
212 decr_secsize = bp->bio_to->sectorsize;
213 /* The real sectorsize of encrypted provider, eg. 512. */
214 encr_secsize = LIST_FIRST(&sc->sc_geom->consumer)->provider->sectorsize;
215 /* Number of data bytes in one encrypted sector, eg. 480. */
216 data_secsize = sc->sc_data_per_sector;
217 /* Number of sectors from decrypted provider, eg. 2. */
218 nsec = bp->bio_length / decr_secsize;
219 /* Number of sectors from encrypted provider, eg. 18. */
220 nsec = (nsec * sc->sc_bytes_per_sector) / encr_secsize;
221 /* Last sector number in every big sector, eg. 9. */
222 lsec = sc->sc_bytes_per_sector / encr_secsize;
223
224 errorp = (int *)((char *)bp->bio_driver2 + encr_secsize * nsec);
225 coroff = -1;
226 corsize = 0;
227 dstoff = bp->bio_offset;
228
229 for (i = 1; i <= nsec; i++) {
230 data_secsize = sc->sc_data_per_sector;
231 if ((i % lsec) == 0)
232 data_secsize = decr_secsize % data_secsize;
233 if (errorp[i - 1] == EBADMSG) {
234 /*
235 * Corruption detected, remember the offset if
236 * this is the first corrupted sector and
237 * increase size.
238 */
239 if (coroff == -1)
240 coroff = dstoff;
241 corsize += data_secsize;
242 } else {
243 /*
244 * No corruption, good.
245 * Report previous corruption if there was one.
246 */
247 if (coroff != -1) {
248 G_ELI_DEBUG(0, "%s: Failed to authenticate %jd "
249 "bytes of data at offset %jd.",
250 sc->sc_name, (intmax_t)corsize,
251 (intmax_t)coroff);
252 coroff = -1;
253 corsize = 0;
254 }
255 }
256 dstoff += data_secsize;
257 }
258 /* Report previous corruption if there was one. */
259 if (coroff != -1) {
260 G_ELI_DEBUG(0, "%s: Failed to authenticate %jd "
261 "bytes of data at offset %jd.",
262 sc->sc_name, (intmax_t)corsize, (intmax_t)coroff);
263 }
264 }
265 g_eli_free_data(bp);
266 if (bp->bio_error != 0) {
267 if (bp->bio_error != EINTEGRITY) {
268 G_ELI_LOGREQ(0, bp,
269 "Crypto READ request failed (error=%d).",
270 bp->bio_error);
271 }
272 bp->bio_completed = 0;
273 }
274 /*
275 * Read is finished, send it up.
276 */
277 g_io_deliver(bp, bp->bio_error);
278 atomic_subtract_int(&sc->sc_inflight, 1);
279 return (0);
280 }
281
282 /*
283 * The function is called after data encryption.
284 *
285 * g_eli_start -> g_eli_auth_run -> G_ELI_AUTH_WRITE_DONE -> g_io_request -> g_eli_write_done -> g_io_deliver
286 */
287 static int
g_eli_auth_write_done(struct cryptop * crp)288 g_eli_auth_write_done(struct cryptop *crp)
289 {
290 struct g_eli_softc *sc;
291 struct g_consumer *cp;
292 struct bio *bp, *cbp, *cbp2;
293 u_int nsec;
294
295 if (crp->crp_etype == EAGAIN) {
296 if (g_eli_crypto_rerun(crp) == 0)
297 return (0);
298 }
299 bp = (struct bio *)crp->crp_opaque;
300 bp->bio_inbed++;
301 if (crp->crp_etype == 0) {
302 G_ELI_DEBUG(3, "Crypto WRITE request done (%d/%d).",
303 bp->bio_inbed, bp->bio_children);
304 } else {
305 G_ELI_DEBUG(1, "Crypto WRITE request failed (%d/%d) error=%d.",
306 bp->bio_inbed, bp->bio_children, crp->crp_etype);
307 if (bp->bio_error == 0)
308 bp->bio_error = crp->crp_etype;
309 }
310 sc = bp->bio_to->geom->softc;
311 if (crp->crp_cipher_key != NULL)
312 g_eli_key_drop(sc, __DECONST(void *, crp->crp_cipher_key));
313 crypto_freereq(crp);
314 /*
315 * All sectors are already encrypted?
316 */
317 if (bp->bio_inbed < bp->bio_children)
318 return (0);
319 if (bp->bio_error != 0) {
320 G_ELI_LOGREQ(0, bp, "Crypto WRITE request failed (error=%d).",
321 bp->bio_error);
322 g_eli_free_data(bp);
323 cbp = bp->bio_driver1;
324 bp->bio_driver1 = NULL;
325 g_destroy_bio(cbp);
326 g_io_deliver(bp, bp->bio_error);
327 atomic_subtract_int(&sc->sc_inflight, 1);
328 return (0);
329 }
330 cp = LIST_FIRST(&sc->sc_geom->consumer);
331 cbp = bp->bio_driver1;
332 bp->bio_driver1 = NULL;
333 cbp->bio_to = cp->provider;
334 cbp->bio_done = g_eli_write_done;
335
336 /* Number of sectors from decrypted provider, eg. 1. */
337 nsec = bp->bio_length / bp->bio_to->sectorsize;
338 /* Number of sectors from encrypted provider, eg. 9. */
339 nsec = (nsec * sc->sc_bytes_per_sector) / cp->provider->sectorsize;
340
341 cbp->bio_length = cp->provider->sectorsize * nsec;
342 cbp->bio_offset = (bp->bio_offset / bp->bio_to->sectorsize) * sc->sc_bytes_per_sector;
343 cbp->bio_data = bp->bio_driver2;
344
345 /*
346 * We write more than what is requested, so we have to be ready to write
347 * more than maxphys.
348 */
349 cbp2 = NULL;
350 if (cbp->bio_length > maxphys) {
351 cbp2 = g_duplicate_bio(bp);
352 cbp2->bio_length = cbp->bio_length - maxphys;
353 cbp2->bio_data = cbp->bio_data + maxphys;
354 cbp2->bio_offset = cbp->bio_offset + maxphys;
355 cbp2->bio_to = cp->provider;
356 cbp2->bio_done = g_eli_write_done;
357 cbp->bio_length = maxphys;
358 }
359 /*
360 * Send encrypted data to the provider.
361 */
362 G_ELI_LOGREQ(2, cbp, "Sending request.");
363 bp->bio_inbed = 0;
364 bp->bio_children = (cbp2 != NULL ? 2 : 1);
365 g_io_request(cbp, cp);
366 if (cbp2 != NULL) {
367 G_ELI_LOGREQ(2, cbp2, "Sending request.");
368 g_io_request(cbp2, cp);
369 }
370 return (0);
371 }
372
373 void
g_eli_auth_read(struct g_eli_softc * sc,struct bio * bp)374 g_eli_auth_read(struct g_eli_softc *sc, struct bio *bp)
375 {
376 struct g_consumer *cp;
377 struct bio *cbp, *cbp2;
378 size_t size;
379 off_t nsec;
380
381 G_ELI_SETWORKER(bp->bio_pflags, 0);
382
383 cp = LIST_FIRST(&sc->sc_geom->consumer);
384 cbp = bp->bio_driver1;
385 bp->bio_driver1 = NULL;
386 cbp->bio_to = cp->provider;
387 cbp->bio_done = g_eli_read_done;
388
389 /* Number of sectors from decrypted provider, eg. 1. */
390 nsec = bp->bio_length / bp->bio_to->sectorsize;
391 /* Number of sectors from encrypted provider, eg. 9. */
392 nsec = (nsec * sc->sc_bytes_per_sector) / cp->provider->sectorsize;
393
394 cbp->bio_length = cp->provider->sectorsize * nsec;
395 size = cbp->bio_length;
396 size += sizeof(int) * nsec;
397 size += G_ELI_AUTH_SECKEYLEN * nsec;
398 cbp->bio_offset = (bp->bio_offset / bp->bio_to->sectorsize) * sc->sc_bytes_per_sector;
399 if (!g_eli_alloc_data(bp, size)) {
400 G_ELI_LOGREQ(0, bp, "Crypto auth read request failed (ENOMEM)");
401 g_destroy_bio(cbp);
402 bp->bio_error = ENOMEM;
403 g_io_deliver(bp, bp->bio_error);
404 atomic_subtract_int(&sc->sc_inflight, 1);
405 return;
406 }
407 cbp->bio_data = bp->bio_driver2;
408
409 /* Clear the error array. */
410 memset((char *)bp->bio_driver2 + cbp->bio_length, 0,
411 sizeof(int) * nsec);
412
413 /*
414 * We read more than what is requested, so we have to be ready to read
415 * more than maxphys.
416 */
417 cbp2 = NULL;
418 if (cbp->bio_length > maxphys) {
419 cbp2 = g_duplicate_bio(bp);
420 cbp2->bio_length = cbp->bio_length - maxphys;
421 cbp2->bio_data = cbp->bio_data + maxphys;
422 cbp2->bio_offset = cbp->bio_offset + maxphys;
423 cbp2->bio_to = cp->provider;
424 cbp2->bio_done = g_eli_read_done;
425 cbp->bio_length = maxphys;
426 }
427 /*
428 * Read encrypted data from provider.
429 */
430 G_ELI_LOGREQ(2, cbp, "Sending request.");
431 g_io_request(cbp, cp);
432 if (cbp2 != NULL) {
433 G_ELI_LOGREQ(2, cbp2, "Sending request.");
434 g_io_request(cbp2, cp);
435 }
436 }
437
438 /*
439 * This is the main function responsible for cryptography (ie. communication
440 * with crypto(9) subsystem).
441 *
442 * BIO_READ:
443 * g_eli_start -> g_eli_auth_read -> g_io_request -> g_eli_read_done -> G_ELI_AUTH_RUN -> g_eli_auth_read_done -> g_io_deliver
444 * BIO_WRITE:
445 * g_eli_start -> G_ELI_AUTH_RUN -> g_eli_auth_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver
446 */
447 void
g_eli_auth_run(struct g_eli_worker * wr,struct bio * bp)448 g_eli_auth_run(struct g_eli_worker *wr, struct bio *bp)
449 {
450 struct g_eli_softc *sc;
451 struct cryptopq crpq;
452 struct cryptop *crp;
453 u_int i, lsec, nsec, data_secsize, decr_secsize, encr_secsize;
454 off_t dstoff;
455 u_char *p, *data, *authkey, *plaindata;
456 int error __diagused;
457 bool batch;
458
459 G_ELI_LOGREQ(3, bp, "%s", __func__);
460
461 G_ELI_SETWORKER(bp->bio_pflags, wr->w_number);
462 sc = wr->w_softc;
463 /* Sectorsize of decrypted provider eg. 4096. */
464 decr_secsize = bp->bio_to->sectorsize;
465 /* The real sectorsize of encrypted provider, eg. 512. */
466 encr_secsize = LIST_FIRST(&sc->sc_geom->consumer)->provider->sectorsize;
467 /* Number of data bytes in one encrypted sector, eg. 480. */
468 data_secsize = sc->sc_data_per_sector;
469 /* Number of sectors from decrypted provider, eg. 2. */
470 nsec = bp->bio_length / decr_secsize;
471 /* Number of sectors from encrypted provider, eg. 18. */
472 nsec = (nsec * sc->sc_bytes_per_sector) / encr_secsize;
473 /* Last sector number in every big sector, eg. 9. */
474 lsec = sc->sc_bytes_per_sector / encr_secsize;
475 /* Destination offset, used for IV generation. */
476 dstoff = (bp->bio_offset / bp->bio_to->sectorsize) * sc->sc_bytes_per_sector;
477
478 plaindata = bp->bio_data;
479 if (bp->bio_cmd == BIO_READ) {
480 data = bp->bio_driver2;
481 p = data + encr_secsize * nsec;
482 p += sizeof(int) * nsec;
483 } else {
484 size_t size;
485
486 size = encr_secsize * nsec;
487 size += G_ELI_AUTH_SECKEYLEN * nsec;
488 size += sizeof(uintptr_t); /* Space for alignment. */
489 if (!g_eli_alloc_data(bp, size)) {
490 G_ELI_LOGREQ(0, bp, "Crypto request failed (ENOMEM)");
491 if (bp->bio_driver1 != NULL) {
492 g_destroy_bio(bp->bio_driver1);
493 bp->bio_driver1 = NULL;
494 }
495 bp->bio_error = ENOMEM;
496 g_io_deliver(bp, bp->bio_error);
497 if (sc != NULL)
498 atomic_subtract_int(&sc->sc_inflight, 1);
499 return;
500 }
501 data = bp->bio_driver2;
502 p = data + encr_secsize * nsec;
503 }
504 bp->bio_inbed = 0;
505 bp->bio_children = nsec;
506
507 #if defined(__mips_n64) || defined(__mips_o64)
508 p = (char *)roundup((uintptr_t)p, sizeof(uintptr_t));
509 #endif
510
511 TAILQ_INIT(&crpq);
512 batch = atomic_load_int(&g_eli_batch) != 0;
513
514 for (i = 1; i <= nsec; i++, dstoff += encr_secsize) {
515 crp = crypto_getreq(wr->w_sid, M_WAITOK);
516 authkey = (u_char *)p; p += G_ELI_AUTH_SECKEYLEN;
517
518 data_secsize = sc->sc_data_per_sector;
519 if ((i % lsec) == 0) {
520 data_secsize = decr_secsize % data_secsize;
521 /*
522 * Last encrypted sector of each decrypted sector is
523 * only partially filled.
524 */
525 if (bp->bio_cmd == BIO_WRITE)
526 memset(data + sc->sc_alen + data_secsize, 0,
527 encr_secsize - sc->sc_alen - data_secsize);
528 } else if (data_secsize + sc->sc_alen != encr_secsize) {
529 /*
530 * If the HMAC size is not a multiple of 128 bits, the
531 * per-sector data size is rounded down to ensure that
532 * encryption can be performed without requiring any
533 * padding. In this case, each sector contains unused
534 * bytes.
535 */
536 if (bp->bio_cmd == BIO_WRITE)
537 memset(data + sc->sc_alen + data_secsize, 0,
538 encr_secsize - sc->sc_alen - data_secsize);
539 }
540
541 if (bp->bio_cmd == BIO_WRITE) {
542 bcopy(plaindata, data + sc->sc_alen, data_secsize);
543 plaindata += data_secsize;
544 }
545
546 crypto_use_buf(crp, data, sc->sc_alen + data_secsize);
547 crp->crp_opaque = (void *)bp;
548 data += encr_secsize;
549 crp->crp_flags = CRYPTO_F_CBIFSYNC;
550 if (bp->bio_cmd == BIO_WRITE) {
551 crp->crp_callback = g_eli_auth_write_done;
552 crp->crp_op = CRYPTO_OP_ENCRYPT |
553 CRYPTO_OP_COMPUTE_DIGEST;
554 } else {
555 crp->crp_callback = g_eli_auth_read_done;
556 crp->crp_op = CRYPTO_OP_DECRYPT |
557 CRYPTO_OP_VERIFY_DIGEST;
558 }
559
560 crp->crp_digest_start = 0;
561 crp->crp_payload_start = sc->sc_alen;
562 crp->crp_payload_length = data_secsize;
563 if ((sc->sc_flags & G_ELI_FLAG_FIRST_KEY) == 0) {
564 crp->crp_cipher_key = g_eli_key_hold(sc, dstoff,
565 encr_secsize);
566 }
567 if (g_eli_ivlen(sc->sc_ealgo) != 0) {
568 crp->crp_flags |= CRYPTO_F_IV_SEPARATE;
569 g_eli_crypto_ivgen(sc, dstoff, crp->crp_iv,
570 sizeof(crp->crp_iv));
571 }
572
573 g_eli_auth_keygen(sc, dstoff, authkey);
574 crp->crp_auth_key = authkey;
575
576 if (batch) {
577 TAILQ_INSERT_TAIL(&crpq, crp, crp_next);
578 } else {
579 error = crypto_dispatch(crp);
580 KASSERT(error == 0,
581 ("crypto_dispatch() failed (error=%d)", error));
582 }
583 }
584
585 if (batch)
586 crypto_dispatch_batch(&crpq, 0);
587 }
588