shash.c 16.9 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12
/*
 * Synchronous Cryptographic Hash operations.
 *
 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

13
#include <crypto/scatterwalk.h>
14 15 16 17 18 19
#include <crypto/internal/hash.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
20 21
#include <linux/cryptouser.h>
#include <net/netlink.h>
22

23 24
#include "internal.h"

25 26
static const struct crypto_type crypto_shash_type;

27 28 29 30 31 32
static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
			   unsigned int keylen)
{
	return -ENOSYS;
}

33 34 35 36 37 38 39 40 41
static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
				  unsigned int keylen)
{
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);
	unsigned long absize;
	u8 *buffer, *alignbuffer;
	int err;

42
	absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
43 44 45 46 47 48 49
	buffer = kmalloc(absize, GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;

	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	memcpy(alignbuffer, key, keylen);
	err = shash->setkey(tfm, alignbuffer, keylen);
50
	kzfree(buffer);
51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
	return err;
}

int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
			unsigned int keylen)
{
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);

	if ((unsigned long)key & alignmask)
		return shash_setkey_unaligned(tfm, key, keylen);

	return shash->setkey(tfm, key, keylen);
}
EXPORT_SYMBOL_GPL(crypto_shash_setkey);

static inline unsigned int shash_align_buffer_size(unsigned len,
						   unsigned long mask)
{
	return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
}

static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
				  unsigned int len)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);
	unsigned int unaligned_len = alignmask + 1 -
				     ((unsigned long)data & alignmask);
81
	u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
82
		__attribute__ ((aligned));
83
	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
84
	int err;
85

86 87 88
	if (unaligned_len > len)
		unaligned_len = len;

89
	memcpy(buf, data, unaligned_len);
90 91
	err = shash->update(desc, buf, unaligned_len);
	memset(buf, 0, unaligned_len);
92

93
	return err ?:
94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116
	       shash->update(desc, data + unaligned_len, len - unaligned_len);
}

int crypto_shash_update(struct shash_desc *desc, const u8 *data,
			unsigned int len)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);

	if ((unsigned long)data & alignmask)
		return shash_update_unaligned(desc, data, len);

	return shash->update(desc, data, len);
}
EXPORT_SYMBOL_GPL(crypto_shash_update);

static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
{
	struct crypto_shash *tfm = desc->tfm;
	unsigned long alignmask = crypto_shash_alignmask(tfm);
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned int ds = crypto_shash_digestsize(tfm);
117
	u8 ubuf[shash_align_buffer_size(ds, alignmask)]
118
		__attribute__ ((aligned));
119
	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
120 121 122
	int err;

	err = shash->final(desc, buf);
123 124 125
	if (err)
		goto out;

126
	memcpy(out, buf, ds);
127 128 129

out:
	memset(buf, 0, ds);
130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159
	return err;
}

int crypto_shash_final(struct shash_desc *desc, u8 *out)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);

	if ((unsigned long)out & alignmask)
		return shash_final_unaligned(desc, out);

	return shash->final(desc, out);
}
EXPORT_SYMBOL_GPL(crypto_shash_final);

static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
				 unsigned int len, u8 *out)
{
	return crypto_shash_update(desc, data, len) ?:
	       crypto_shash_final(desc, out);
}

int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
		       unsigned int len, u8 *out)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);

160
	if (((unsigned long)data | (unsigned long)out) & alignmask)
161 162 163 164 165 166 167 168 169 170
		return shash_finup_unaligned(desc, data, len, out);

	return shash->finup(desc, data, len, out);
}
EXPORT_SYMBOL_GPL(crypto_shash_finup);

static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
				  unsigned int len, u8 *out)
{
	return crypto_shash_init(desc) ?:
171
	       crypto_shash_finup(desc, data, len, out);
172 173 174 175 176 177 178 179 180
}

int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
			unsigned int len, u8 *out)
{
	struct crypto_shash *tfm = desc->tfm;
	struct shash_alg *shash = crypto_shash_alg(tfm);
	unsigned long alignmask = crypto_shash_alignmask(tfm);

181
	if (((unsigned long)data | (unsigned long)out) & alignmask)
182 183 184 185 186 187
		return shash_digest_unaligned(desc, data, len, out);

	return shash->digest(desc, data, len, out);
}
EXPORT_SYMBOL_GPL(crypto_shash_digest);

188
static int shash_default_export(struct shash_desc *desc, void *out)
189
{
190 191
	memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
	return 0;
192
}
193

194
static int shash_default_import(struct shash_desc *desc, const void *in)
195
{
196 197
	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
	return 0;
198 199
}

200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218
static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
			      unsigned int keylen)
{
	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);

	return crypto_shash_setkey(*ctx, key, keylen);
}

static int shash_async_init(struct ahash_request *req)
{
	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	struct shash_desc *desc = ahash_request_ctx(req);

	desc->tfm = *ctx;
	desc->flags = req->base.flags;

	return crypto_shash_init(desc);
}

219
int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
220 221 222 223 224 225 226 227 228 229
{
	struct crypto_hash_walk walk;
	int nbytes;

	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
	     nbytes = crypto_hash_walk_done(&walk, nbytes))
		nbytes = crypto_shash_update(desc, walk.data, nbytes);

	return nbytes;
}
230 231 232 233 234 235
EXPORT_SYMBOL_GPL(shash_ahash_update);

static int shash_async_update(struct ahash_request *req)
{
	return shash_ahash_update(req, ahash_request_ctx(req));
}
236 237 238 239 240 241

static int shash_async_final(struct ahash_request *req)
{
	return crypto_shash_final(ahash_request_ctx(req), req->result);
}

242 243 244 245 246
int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
{
	struct crypto_hash_walk walk;
	int nbytes;

247 248 249 250 251
	nbytes = crypto_hash_walk_first(req, &walk);
	if (!nbytes)
		return crypto_shash_final(desc, req->result);

	do {
252 253 254 255
		nbytes = crypto_hash_walk_last(&walk) ?
			 crypto_shash_finup(desc, walk.data, nbytes,
					    req->result) :
			 crypto_shash_update(desc, walk.data, nbytes);
256 257
		nbytes = crypto_hash_walk_done(&walk, nbytes);
	} while (nbytes > 0);
258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273

	return nbytes;
}
EXPORT_SYMBOL_GPL(shash_ahash_finup);

static int shash_async_finup(struct ahash_request *req)
{
	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	struct shash_desc *desc = ahash_request_ctx(req);

	desc->tfm = *ctx;
	desc->flags = req->base.flags;

	return shash_ahash_finup(req, desc);
}

274
int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
275 276 277 278 279 280 281 282 283
{
	struct scatterlist *sg = req->src;
	unsigned int offset = sg->offset;
	unsigned int nbytes = req->nbytes;
	int err;

	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
		void *data;

284
		data = kmap_atomic(sg_page(sg));
285 286
		err = crypto_shash_digest(desc, data + offset, nbytes,
					  req->result);
287
		kunmap_atomic(data);
288
		crypto_yield(desc->flags);
289 290
	} else
		err = crypto_shash_init(desc) ?:
291
		      shash_ahash_finup(req, desc);
292

293 294 295
	return err;
}
EXPORT_SYMBOL_GPL(shash_ahash_digest);
296

297 298 299 300
static int shash_async_digest(struct ahash_request *req)
{
	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	struct shash_desc *desc = ahash_request_ctx(req);
301

302 303
	desc->tfm = *ctx;
	desc->flags = req->base.flags;
304

305
	return shash_ahash_digest(req, desc);
306 307
}

308 309 310 311 312 313 314
static int shash_async_export(struct ahash_request *req, void *out)
{
	return crypto_shash_export(ahash_request_ctx(req), out);
}

static int shash_async_import(struct ahash_request *req, const void *in)
{
315 316 317 318 319 320 321
	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
	struct shash_desc *desc = ahash_request_ctx(req);

	desc->tfm = *ctx;
	desc->flags = req->base.flags;

	return crypto_shash_import(desc, in);
322 323
}

324 325 326 327 328 329 330
static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
{
	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);

	crypto_free_shash(*ctx);
}

331
int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
332 333
{
	struct crypto_alg *calg = tfm->__crt_alg;
334
	struct shash_alg *alg = __crypto_shash_alg(calg);
335
	struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
336 337 338 339 340 341
	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
	struct crypto_shash *shash;

	if (!crypto_mod_get(calg))
		return -EAGAIN;

342
	shash = crypto_create_tfm(calg, &crypto_shash_type);
343 344 345 346 347 348 349 350 351 352
	if (IS_ERR(shash)) {
		crypto_mod_put(calg);
		return PTR_ERR(shash);
	}

	*ctx = shash;
	tfm->exit = crypto_exit_shash_ops_async;

	crt->init = shash_async_init;
	crt->update = shash_async_update;
353 354
	crt->final = shash_async_final;
	crt->finup = shash_async_finup;
355
	crt->digest = shash_async_digest;
356 357 358 359 360

	if (alg->setkey)
		crt->setkey = shash_async_setkey;
	if (alg->export)
		crt->export = shash_async_export;
361
	if (alg->import)
362
		crt->import = shash_async_import;
363 364 365 366 367 368

	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);

	return 0;
}

369 370 371
static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
			       unsigned int keylen)
{
372 373
	struct shash_desc **descp = crypto_hash_ctx(tfm);
	struct shash_desc *desc = *descp;
374 375 376 377 378 379

	return crypto_shash_setkey(desc->tfm, key, keylen);
}

static int shash_compat_init(struct hash_desc *hdesc)
{
380 381
	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
	struct shash_desc *desc = *descp;
382 383 384 385 386 387 388 389 390

	desc->flags = hdesc->flags;

	return crypto_shash_init(desc);
}

static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
			       unsigned int len)
{
391 392
	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
	struct shash_desc *desc = *descp;
393 394 395 396 397 398 399 400 401 402 403 404
	struct crypto_hash_walk walk;
	int nbytes;

	for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
	     nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
		nbytes = crypto_shash_update(desc, walk.data, nbytes);

	return nbytes;
}

static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
{
405 406 407
	struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);

	return crypto_shash_final(*descp, out);
408 409 410 411 412 413 414 415 416
}

static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
			       unsigned int nbytes, u8 *out)
{
	unsigned int offset = sg->offset;
	int err;

	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
417 418
		struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
		struct shash_desc *desc = *descp;
419 420 421 422
		void *data;

		desc->flags = hdesc->flags;

423
		data = kmap_atomic(sg_page(sg));
424
		err = crypto_shash_digest(desc, data + offset, nbytes, out);
425
		kunmap_atomic(data);
426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445
		crypto_yield(desc->flags);
		goto out;
	}

	err = shash_compat_init(hdesc);
	if (err)
		goto out;

	err = shash_compat_update(hdesc, sg, nbytes);
	if (err)
		goto out;

	err = shash_compat_final(hdesc, out);

out:
	return err;
}

static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
{
446 447
	struct shash_desc **descp = crypto_tfm_ctx(tfm);
	struct shash_desc *desc = *descp;
448 449

	crypto_free_shash(desc->tfm);
450
	kzfree(desc);
451 452 453 454 455 456 457
}

static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
{
	struct hash_tfm *crt = &tfm->crt_hash;
	struct crypto_alg *calg = tfm->__crt_alg;
	struct shash_alg *alg = __crypto_shash_alg(calg);
458
	struct shash_desc **descp = crypto_tfm_ctx(tfm);
459
	struct crypto_shash *shash;
460
	struct shash_desc *desc;
461

462 463 464
	if (!crypto_mod_get(calg))
		return -EAGAIN;

465
	shash = crypto_create_tfm(calg, &crypto_shash_type);
466 467
	if (IS_ERR(shash)) {
		crypto_mod_put(calg);
468
		return PTR_ERR(shash);
469
	}
470

471 472 473 474 475 476 477 478
	desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
		       GFP_KERNEL);
	if (!desc) {
		crypto_free_shash(shash);
		return -ENOMEM;
	}

	*descp = desc;
479 480 481 482 483 484 485 486 487 488 489 490 491 492
	desc->tfm = shash;
	tfm->exit = crypto_exit_shash_ops_compat;

	crt->init = shash_compat_init;
	crt->update = shash_compat_update;
	crt->final  = shash_compat_final;
	crt->digest = shash_compat_digest;
	crt->setkey = shash_compat_setkey;

	crt->digestsize = alg->digestsize;

	return 0;
}

493 494 495
static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
	switch (mask & CRYPTO_ALG_TYPE_MASK) {
496 497
	case CRYPTO_ALG_TYPE_HASH_MASK:
		return crypto_init_shash_ops_compat(tfm);
498 499 500 501 502 503 504 505 506
	}

	return -EINVAL;
}

static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
					 u32 mask)
{
	switch (mask & CRYPTO_ALG_TYPE_MASK) {
507
	case CRYPTO_ALG_TYPE_HASH_MASK:
508
		return sizeof(struct shash_desc *);
509 510 511 512 513
	}

	return 0;
}

514
static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
515
{
516 517 518
	struct crypto_shash *hash = __crypto_shash_cast(tfm);

	hash->descsize = crypto_shash_alg(hash)->descsize;
519 520 521
	return 0;
}

522
static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
523 524 525 526
{
	return alg->cra_ctxsize;
}

527
#ifdef CONFIG_NET
528 529 530 531 532 533 534 535 536
static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_hash rhash;
	struct shash_alg *salg = __crypto_shash_alg(alg);

	snprintf(rhash.type, CRYPTO_MAX_ALG_NAME, "%s", "shash");
	rhash.blocksize = alg->cra_blocksize;
	rhash.digestsize = salg->digestsize;

537 538 539
	if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
		    sizeof(struct crypto_report_hash), &rhash))
		goto nla_put_failure;
540 541 542 543 544
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}
545 546 547 548 549 550
#else
static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	return -ENOSYS;
}
#endif
551

552 553 554 555 556 557 558 559 560 561 562 563
static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));
static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
{
	struct shash_alg *salg = __crypto_shash_alg(alg);

	seq_printf(m, "type         : shash\n");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "digestsize   : %u\n", salg->digestsize);
}

static const struct crypto_type crypto_shash_type = {
564
	.ctxsize = crypto_shash_ctxsize,
565
	.extsize = crypto_shash_extsize,
566
	.init = crypto_init_shash_ops,
567 568 569 570
	.init_tfm = crypto_shash_init_tfm,
#ifdef CONFIG_PROC_FS
	.show = crypto_shash_show,
#endif
571
	.report = crypto_shash_report,
572 573 574 575 576 577 578 579 580
	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	.maskset = CRYPTO_ALG_TYPE_MASK,
	.type = CRYPTO_ALG_TYPE_SHASH,
	.tfmsize = offsetof(struct crypto_shash, base),
};

struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
					u32 mask)
{
581
	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
582 583 584
}
EXPORT_SYMBOL_GPL(crypto_alloc_shash);

585
static int shash_prepare_alg(struct shash_alg *alg)
586 587 588 589
{
	struct crypto_alg *base = &alg->base;

	if (alg->digestsize > PAGE_SIZE / 8 ||
590 591
	    alg->descsize > PAGE_SIZE / 8 ||
	    alg->statesize > PAGE_SIZE / 8)
592 593 594 595 596
		return -EINVAL;

	base->cra_type = &crypto_shash_type;
	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
597

598 599 600 601
	if (!alg->finup)
		alg->finup = shash_finup_unaligned;
	if (!alg->digest)
		alg->digest = shash_digest_unaligned;
602 603 604 605 606
	if (!alg->export) {
		alg->export = shash_default_export;
		alg->import = shash_default_import;
		alg->statesize = alg->descsize;
	}
607 608
	if (!alg->setkey)
		alg->setkey = shash_no_setkey;
609

610 611 612 613 614 615 616 617 618 619 620
	return 0;
}

int crypto_register_shash(struct shash_alg *alg)
{
	struct crypto_alg *base = &alg->base;
	int err;

	err = shash_prepare_alg(alg);
	if (err)
		return err;
621 622 623 624 625 626 627 628 629 630 631

	return crypto_register_alg(base);
}
EXPORT_SYMBOL_GPL(crypto_register_shash);

int crypto_unregister_shash(struct shash_alg *alg)
{
	return crypto_unregister_alg(&alg->base);
}
EXPORT_SYMBOL_GPL(crypto_unregister_shash);

632 633 634 635 636 637 638 639 640 641 642 643 644
int shash_register_instance(struct crypto_template *tmpl,
			    struct shash_instance *inst)
{
	int err;

	err = shash_prepare_alg(&inst->alg);
	if (err)
		return err;

	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
}
EXPORT_SYMBOL_GPL(shash_register_instance);

645 646 647 648 649 650 651
void shash_free_instance(struct crypto_instance *inst)
{
	crypto_drop_spawn(crypto_instance_ctx(inst));
	kfree(shash_instance(inst));
}
EXPORT_SYMBOL_GPL(shash_free_instance);

652 653 654 655 656 657 658 659 660
int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
			    struct shash_alg *alg,
			    struct crypto_instance *inst)
{
	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
				  &crypto_shash_type);
}
EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);

661 662 663 664 665 666 667 668 669 670
struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
{
	struct crypto_alg *alg;

	alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
	return IS_ERR(alg) ? ERR_CAST(alg) :
	       container_of(alg, struct shash_alg, base);
}
EXPORT_SYMBOL_GPL(shash_attr_alg);

671 672
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Synchronous cryptographic hash type");