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v4.17
 
  1/*
  2 * Synchronous Cryptographic Hash operations.
  3 *
  4 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
  5 *
  6 * This program is free software; you can redistribute it and/or modify it
  7 * under the terms of the GNU General Public License as published by the Free
  8 * Software Foundation; either version 2 of the License, or (at your option)
  9 * any later version.
 10 *
 11 */
 12
 13#include <crypto/scatterwalk.h>
 14#include <crypto/internal/hash.h>
 15#include <linux/err.h>
 16#include <linux/kernel.h>
 17#include <linux/module.h>
 18#include <linux/slab.h>
 19#include <linux/seq_file.h>
 20#include <linux/cryptouser.h>
 21#include <net/netlink.h>
 22#include <linux/compiler.h>
 23
 24#include "internal.h"
 
 
 
 
 
 25
 26static const struct crypto_type crypto_shash_type;
 
 
 
 
 
 27
 28int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
 29		    unsigned int keylen)
 30{
 31	return -ENOSYS;
 32}
 33EXPORT_SYMBOL_GPL(shash_no_setkey);
 34
 35static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
 36				  unsigned int keylen)
 37{
 38	struct shash_alg *shash = crypto_shash_alg(tfm);
 39	unsigned long alignmask = crypto_shash_alignmask(tfm);
 40	unsigned long absize;
 41	u8 *buffer, *alignbuffer;
 42	int err;
 43
 44	absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
 45	buffer = kmalloc(absize, GFP_ATOMIC);
 46	if (!buffer)
 47		return -ENOMEM;
 48
 49	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
 50	memcpy(alignbuffer, key, keylen);
 51	err = shash->setkey(tfm, alignbuffer, keylen);
 52	kzfree(buffer);
 53	return err;
 54}
 55
 56int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
 57			unsigned int keylen)
 58{
 59	struct shash_alg *shash = crypto_shash_alg(tfm);
 60	unsigned long alignmask = crypto_shash_alignmask(tfm);
 61	int err;
 62
 63	if ((unsigned long)key & alignmask)
 64		err = shash_setkey_unaligned(tfm, key, keylen);
 65	else
 66		err = shash->setkey(tfm, key, keylen);
 67
 68	if (err)
 69		return err;
 
 70
 71	crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
 72	return 0;
 73}
 74EXPORT_SYMBOL_GPL(crypto_shash_setkey);
 75
 76static inline unsigned int shash_align_buffer_size(unsigned len,
 77						   unsigned long mask)
 78{
 79	typedef u8 __aligned_largest u8_aligned;
 80	return len + (mask & ~(__alignof__(u8_aligned) - 1));
 81}
 82
 83static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
 84				  unsigned int len)
 85{
 86	struct crypto_shash *tfm = desc->tfm;
 87	struct shash_alg *shash = crypto_shash_alg(tfm);
 88	unsigned long alignmask = crypto_shash_alignmask(tfm);
 89	unsigned int unaligned_len = alignmask + 1 -
 90				     ((unsigned long)data & alignmask);
 91	u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
 92		__aligned_largest;
 93	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
 94	int err;
 95
 96	if (unaligned_len > len)
 97		unaligned_len = len;
 98
 99	memcpy(buf, data, unaligned_len);
100	err = shash->update(desc, buf, unaligned_len);
101	memset(buf, 0, unaligned_len);
102
103	return err ?:
104	       shash->update(desc, data + unaligned_len, len - unaligned_len);
105}
106
107int crypto_shash_update(struct shash_desc *desc, const u8 *data,
108			unsigned int len)
109{
110	struct crypto_shash *tfm = desc->tfm;
111	struct shash_alg *shash = crypto_shash_alg(tfm);
112	unsigned long alignmask = crypto_shash_alignmask(tfm);
113
114	if ((unsigned long)data & alignmask)
115		return shash_update_unaligned(desc, data, len);
116
117	return shash->update(desc, data, len);
118}
119EXPORT_SYMBOL_GPL(crypto_shash_update);
120
121static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
122{
123	struct crypto_shash *tfm = desc->tfm;
124	unsigned long alignmask = crypto_shash_alignmask(tfm);
125	struct shash_alg *shash = crypto_shash_alg(tfm);
126	unsigned int ds = crypto_shash_digestsize(tfm);
127	u8 ubuf[shash_align_buffer_size(ds, alignmask)]
128		__aligned_largest;
129	u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
130	int err;
131
132	err = shash->final(desc, buf);
133	if (err)
134		goto out;
135
136	memcpy(out, buf, ds);
137
138out:
139	memset(buf, 0, ds);
140	return err;
141}
 
142
143int crypto_shash_final(struct shash_desc *desc, u8 *out)
144{
145	struct crypto_shash *tfm = desc->tfm;
146	struct shash_alg *shash = crypto_shash_alg(tfm);
147	unsigned long alignmask = crypto_shash_alignmask(tfm);
 
 
148
149	if ((unsigned long)out & alignmask)
150		return shash_final_unaligned(desc, out);
151
152	return shash->final(desc, out);
153}
154EXPORT_SYMBOL_GPL(crypto_shash_final);
155
156static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
157				 unsigned int len, u8 *out)
158{
159	return crypto_shash_update(desc, data, len) ?:
160	       crypto_shash_final(desc, out);
 
 
161}
162
163int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
164		       unsigned int len, u8 *out)
165{
166	struct crypto_shash *tfm = desc->tfm;
167	struct shash_alg *shash = crypto_shash_alg(tfm);
168	unsigned long alignmask = crypto_shash_alignmask(tfm);
 
 
 
169
170	if (((unsigned long)data | (unsigned long)out) & alignmask)
171		return shash_finup_unaligned(desc, data, len, out);
 
172
173	return shash->finup(desc, data, len, out);
 
 
174}
175EXPORT_SYMBOL_GPL(crypto_shash_finup);
176
177static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
178				  unsigned int len, u8 *out)
179{
180	return crypto_shash_init(desc) ?:
181	       crypto_shash_finup(desc, data, len, out);
 
 
182}
183
184int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
185			unsigned int len, u8 *out)
186{
187	struct crypto_shash *tfm = desc->tfm;
188	struct shash_alg *shash = crypto_shash_alg(tfm);
189	unsigned long alignmask = crypto_shash_alignmask(tfm);
190
191	if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
192		return -ENOKEY;
193
194	if (((unsigned long)data | (unsigned long)out) & alignmask)
195		return shash_digest_unaligned(desc, data, len, out);
196
197	return shash->digest(desc, data, len, out);
198}
199EXPORT_SYMBOL_GPL(crypto_shash_digest);
200
201static int shash_default_export(struct shash_desc *desc, void *out)
202{
203	memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
204	return 0;
205}
206
207static int shash_default_import(struct shash_desc *desc, const void *in)
208{
209	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
210	return 0;
211}
 
212
213static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
214			      unsigned int keylen)
215{
216	struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
 
217
218	return crypto_shash_setkey(*ctx, key, keylen);
219}
220
221static int shash_async_init(struct ahash_request *req)
222{
223	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
224	struct shash_desc *desc = ahash_request_ctx(req);
225
226	desc->tfm = *ctx;
227	desc->flags = req->base.flags;
228
229	return crypto_shash_init(desc);
230}
 
231
232int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
233{
234	struct crypto_hash_walk walk;
235	int nbytes;
236
237	for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
238	     nbytes = crypto_hash_walk_done(&walk, nbytes))
239		nbytes = crypto_shash_update(desc, walk.data, nbytes);
240
241	return nbytes;
242}
243EXPORT_SYMBOL_GPL(shash_ahash_update);
244
245static int shash_async_update(struct ahash_request *req)
246{
247	return shash_ahash_update(req, ahash_request_ctx(req));
248}
249
250static int shash_async_final(struct ahash_request *req)
251{
252	return crypto_shash_final(ahash_request_ctx(req), req->result);
253}
 
254
255int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
256{
257	struct crypto_hash_walk walk;
258	int nbytes;
259
260	nbytes = crypto_hash_walk_first(req, &walk);
261	if (!nbytes)
262		return crypto_shash_final(desc, req->result);
263
264	do {
265		nbytes = crypto_hash_walk_last(&walk) ?
266			 crypto_shash_finup(desc, walk.data, nbytes,
267					    req->result) :
268			 crypto_shash_update(desc, walk.data, nbytes);
269		nbytes = crypto_hash_walk_done(&walk, nbytes);
270	} while (nbytes > 0);
271
272	return nbytes;
 
273}
274EXPORT_SYMBOL_GPL(shash_ahash_finup);
275
276static int shash_async_finup(struct ahash_request *req)
277{
278	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
279	struct shash_desc *desc = ahash_request_ctx(req);
280
281	desc->tfm = *ctx;
282	desc->flags = req->base.flags;
283
284	return shash_ahash_finup(req, desc);
285}
286
287int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
288{
289	unsigned int nbytes = req->nbytes;
290	struct scatterlist *sg;
291	unsigned int offset;
292	int err;
293
294	if (nbytes &&
295	    (sg = req->src, offset = sg->offset,
296	     nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
297		void *data;
298
299		data = kmap_atomic(sg_page(sg));
300		err = crypto_shash_digest(desc, data + offset, nbytes,
301					  req->result);
302		kunmap_atomic(data);
303		crypto_yield(desc->flags);
304	} else
305		err = crypto_shash_init(desc) ?:
306		      shash_ahash_finup(req, desc);
307
308	return err;
309}
310EXPORT_SYMBOL_GPL(shash_ahash_digest);
311
312static int shash_async_digest(struct ahash_request *req)
313{
314	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
315	struct shash_desc *desc = ahash_request_ctx(req);
316
317	desc->tfm = *ctx;
318	desc->flags = req->base.flags;
319
320	return shash_ahash_digest(req, desc);
321}
322
323static int shash_async_export(struct ahash_request *req, void *out)
324{
325	return crypto_shash_export(ahash_request_ctx(req), out);
326}
327
328static int shash_async_import(struct ahash_request *req, const void *in)
329{
330	struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
331	struct shash_desc *desc = ahash_request_ctx(req);
332
333	desc->tfm = *ctx;
334	desc->flags = req->base.flags;
335
336	return crypto_shash_import(desc, in);
337}
338
339static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
340{
341	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
342
343	crypto_free_shash(*ctx);
344}
345
346int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
347{
348	struct crypto_alg *calg = tfm->__crt_alg;
349	struct shash_alg *alg = __crypto_shash_alg(calg);
350	struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
351	struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
352	struct crypto_shash *shash;
353
354	if (!crypto_mod_get(calg))
355		return -EAGAIN;
 
356
357	shash = crypto_create_tfm(calg, &crypto_shash_type);
358	if (IS_ERR(shash)) {
359		crypto_mod_put(calg);
360		return PTR_ERR(shash);
 
361	}
362
363	*ctx = shash;
364	tfm->exit = crypto_exit_shash_ops_async;
365
366	crt->init = shash_async_init;
367	crt->update = shash_async_update;
368	crt->final = shash_async_final;
369	crt->finup = shash_async_finup;
370	crt->digest = shash_async_digest;
371	crt->setkey = shash_async_setkey;
372
373	crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
374				    CRYPTO_TFM_NEED_KEY);
375
376	if (alg->export)
377		crt->export = shash_async_export;
378	if (alg->import)
379		crt->import = shash_async_import;
380
381	crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
382
383	return 0;
384}
385
386static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
387{
388	struct crypto_shash *hash = __crypto_shash_cast(tfm);
389	struct shash_alg *alg = crypto_shash_alg(hash);
390
391	hash->descsize = alg->descsize;
392
393	if (crypto_shash_alg_has_setkey(alg) &&
394	    !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
395		crypto_shash_set_flags(hash, CRYPTO_TFM_NEED_KEY);
396
397	return 0;
398}
399
400#ifdef CONFIG_NET
401static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
402{
403	struct crypto_report_hash rhash;
404	struct shash_alg *salg = __crypto_shash_alg(alg);
405
406	strncpy(rhash.type, "shash", sizeof(rhash.type));
 
 
407
408	rhash.blocksize = alg->cra_blocksize;
409	rhash.digestsize = salg->digestsize;
410
411	if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
412		    sizeof(struct crypto_report_hash), &rhash))
413		goto nla_put_failure;
414	return 0;
415
416nla_put_failure:
417	return -EMSGSIZE;
418}
419#else
420static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
421{
422	return -ENOSYS;
423}
424#endif
425
426static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
427	__maybe_unused;
428static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
429{
430	struct shash_alg *salg = __crypto_shash_alg(alg);
431
432	seq_printf(m, "type         : shash\n");
433	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
434	seq_printf(m, "digestsize   : %u\n", salg->digestsize);
435}
436
437static const struct crypto_type crypto_shash_type = {
 
 
 
 
 
 
438	.extsize = crypto_alg_extsize,
439	.init_tfm = crypto_shash_init_tfm,
 
440#ifdef CONFIG_PROC_FS
441	.show = crypto_shash_show,
442#endif
 
443	.report = crypto_shash_report,
 
 
 
 
444	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
445	.maskset = CRYPTO_ALG_TYPE_MASK,
446	.type = CRYPTO_ALG_TYPE_SHASH,
447	.tfmsize = offsetof(struct crypto_shash, base),
448};
449
 
 
 
 
 
 
 
 
 
450struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
451					u32 mask)
452{
453	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
454}
455EXPORT_SYMBOL_GPL(crypto_alloc_shash);
456
457static int shash_prepare_alg(struct shash_alg *alg)
 
 
 
 
 
 
458{
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
459	struct crypto_alg *base = &alg->base;
460
461	if (alg->digestsize > PAGE_SIZE / 8 ||
462	    alg->descsize > PAGE_SIZE / 8 ||
463	    alg->statesize > PAGE_SIZE / 8)
 
 
464		return -EINVAL;
465
466	base->cra_type = &crypto_shash_type;
467	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
468	base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
469
 
 
 
 
 
 
 
 
 
 
 
470	if (!alg->finup)
471		alg->finup = shash_finup_unaligned;
472	if (!alg->digest)
473		alg->digest = shash_digest_unaligned;
474	if (!alg->export) {
475		alg->export = shash_default_export;
476		alg->import = shash_default_import;
477		alg->statesize = alg->descsize;
478	}
479	if (!alg->setkey)
480		alg->setkey = shash_no_setkey;
481
482	return 0;
483}
484
485int crypto_register_shash(struct shash_alg *alg)
486{
487	struct crypto_alg *base = &alg->base;
488	int err;
489
490	err = shash_prepare_alg(alg);
491	if (err)
492		return err;
493
494	return crypto_register_alg(base);
495}
496EXPORT_SYMBOL_GPL(crypto_register_shash);
497
498int crypto_unregister_shash(struct shash_alg *alg)
499{
500	return crypto_unregister_alg(&alg->base);
501}
502EXPORT_SYMBOL_GPL(crypto_unregister_shash);
503
504int crypto_register_shashes(struct shash_alg *algs, int count)
505{
506	int i, ret;
507
508	for (i = 0; i < count; i++) {
509		ret = crypto_register_shash(&algs[i]);
510		if (ret)
511			goto err;
512	}
513
514	return 0;
515
516err:
517	for (--i; i >= 0; --i)
518		crypto_unregister_shash(&algs[i]);
519
520	return ret;
521}
522EXPORT_SYMBOL_GPL(crypto_register_shashes);
523
524int crypto_unregister_shashes(struct shash_alg *algs, int count)
525{
526	int i, ret;
527
528	for (i = count - 1; i >= 0; --i) {
529		ret = crypto_unregister_shash(&algs[i]);
530		if (ret)
531			pr_err("Failed to unregister %s %s: %d\n",
532			       algs[i].base.cra_driver_name,
533			       algs[i].base.cra_name, ret);
534	}
535
536	return 0;
 
537}
538EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
539
540int shash_register_instance(struct crypto_template *tmpl,
541			    struct shash_instance *inst)
542{
543	int err;
544
 
 
 
545	err = shash_prepare_alg(&inst->alg);
546	if (err)
547		return err;
548
549	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
550}
551EXPORT_SYMBOL_GPL(shash_register_instance);
552
553void shash_free_instance(struct crypto_instance *inst)
554{
555	crypto_drop_spawn(crypto_instance_ctx(inst));
556	kfree(shash_instance(inst));
557}
558EXPORT_SYMBOL_GPL(shash_free_instance);
559
560int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
561			    struct shash_alg *alg,
562			    struct crypto_instance *inst)
563{
564	return crypto_init_spawn2(&spawn->base, &alg->base, inst,
565				  &crypto_shash_type);
566}
567EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
568
569struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
570{
571	struct crypto_alg *alg;
572
573	alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
574	return IS_ERR(alg) ? ERR_CAST(alg) :
575	       container_of(alg, struct shash_alg, base);
576}
577EXPORT_SYMBOL_GPL(shash_attr_alg);
578
579MODULE_LICENSE("GPL");
580MODULE_DESCRIPTION("Synchronous cryptographic hash type");
v6.8
  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Synchronous Cryptographic Hash operations.
  4 *
  5 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
 
 
 
 
 
 
  6 */
  7
  8#include <crypto/scatterwalk.h>
  9#include <linux/cryptouser.h>
 10#include <linux/err.h>
 11#include <linux/kernel.h>
 12#include <linux/module.h>
 
 13#include <linux/seq_file.h>
 14#include <linux/string.h>
 15#include <net/netlink.h>
 
 16
 17#include "hash.h"
 18
 19static inline struct crypto_istat_hash *shash_get_stat(struct shash_alg *alg)
 20{
 21	return hash_get_stat(&alg->halg);
 22}
 23
 24static inline int crypto_shash_errstat(struct shash_alg *alg, int err)
 25{
 26	if (IS_ENABLED(CONFIG_CRYPTO_STATS) && err)
 27		atomic64_inc(&shash_get_stat(alg)->err_cnt);
 28	return err;
 29}
 30
 31int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
 32		    unsigned int keylen)
 33{
 34	return -ENOSYS;
 35}
 36EXPORT_SYMBOL_GPL(shash_no_setkey);
 37
 38static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
 
 39{
 40	if (crypto_shash_alg_needs_key(alg))
 41		crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 42}
 43
 44int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
 45			unsigned int keylen)
 46{
 47	struct shash_alg *shash = crypto_shash_alg(tfm);
 
 48	int err;
 49
 50	err = shash->setkey(tfm, key, keylen);
 51	if (unlikely(err)) {
 52		shash_set_needkey(tfm, shash);
 
 
 
 53		return err;
 54	}
 55
 56	crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
 57	return 0;
 58}
 59EXPORT_SYMBOL_GPL(crypto_shash_setkey);
 60
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 61int crypto_shash_update(struct shash_desc *desc, const u8 *data,
 62			unsigned int len)
 63{
 64	struct shash_alg *shash = crypto_shash_alg(desc->tfm);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 65	int err;
 66
 67	if (IS_ENABLED(CONFIG_CRYPTO_STATS))
 68		atomic64_add(len, &shash_get_stat(shash)->hash_tlen);
 
 69
 70	err = shash->update(desc, data, len);
 71
 72	return crypto_shash_errstat(shash, err);
 
 
 73}
 74EXPORT_SYMBOL_GPL(crypto_shash_update);
 75
 76int crypto_shash_final(struct shash_desc *desc, u8 *out)
 77{
 78	struct shash_alg *shash = crypto_shash_alg(desc->tfm);
 79	int err;
 80
 81	if (IS_ENABLED(CONFIG_CRYPTO_STATS))
 82		atomic64_inc(&shash_get_stat(shash)->hash_cnt);
 83
 84	err = shash->final(desc, out);
 
 85
 86	return crypto_shash_errstat(shash, err);
 87}
 88EXPORT_SYMBOL_GPL(crypto_shash_final);
 89
 90static int shash_default_finup(struct shash_desc *desc, const u8 *data,
 91			       unsigned int len, u8 *out)
 92{
 93	struct shash_alg *shash = crypto_shash_alg(desc->tfm);
 94
 95	return shash->update(desc, data, len) ?:
 96	       shash->final(desc, out);
 97}
 98
 99int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
100		       unsigned int len, u8 *out)
101{
102	struct crypto_shash *tfm = desc->tfm;
103	struct shash_alg *shash = crypto_shash_alg(tfm);
104	int err;
105
106	if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
107		struct crypto_istat_hash *istat = shash_get_stat(shash);
108
109		atomic64_inc(&istat->hash_cnt);
110		atomic64_add(len, &istat->hash_tlen);
111	}
112
113	err = shash->finup(desc, data, len, out);
114
115	return crypto_shash_errstat(shash, err);
116}
117EXPORT_SYMBOL_GPL(crypto_shash_finup);
118
119static int shash_default_digest(struct shash_desc *desc, const u8 *data,
120				unsigned int len, u8 *out)
121{
122	struct shash_alg *shash = crypto_shash_alg(desc->tfm);
123
124	return shash->init(desc) ?:
125	       shash->finup(desc, data, len, out);
126}
127
128int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
129			unsigned int len, u8 *out)
130{
131	struct crypto_shash *tfm = desc->tfm;
132	struct shash_alg *shash = crypto_shash_alg(tfm);
133	int err;
 
 
 
134
135	if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
136		struct crypto_istat_hash *istat = shash_get_stat(shash);
137
138		atomic64_inc(&istat->hash_cnt);
139		atomic64_add(len, &istat->hash_tlen);
140	}
141
142	if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
143		err = -ENOKEY;
144	else
145		err = shash->digest(desc, data, len, out);
 
146
147	return crypto_shash_errstat(shash, err);
 
 
 
148}
149EXPORT_SYMBOL_GPL(crypto_shash_digest);
150
151int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
152			    unsigned int len, u8 *out)
153{
154	SHASH_DESC_ON_STACK(desc, tfm);
155	int err;
156
157	desc->tfm = tfm;
 
158
159	err = crypto_shash_digest(desc, data, len, out);
 
 
 
160
161	shash_desc_zero(desc);
 
162
163	return err;
164}
165EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);
166
167int crypto_shash_export(struct shash_desc *desc, void *out)
168{
169	struct crypto_shash *tfm = desc->tfm;
170	struct shash_alg *shash = crypto_shash_alg(tfm);
 
 
 
 
 
 
 
 
171
172	if (shash->export)
173		return shash->export(desc, out);
 
 
174
175	memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(tfm));
176	return 0;
 
177}
178EXPORT_SYMBOL_GPL(crypto_shash_export);
179
180int crypto_shash_import(struct shash_desc *desc, const void *in)
181{
182	struct crypto_shash *tfm = desc->tfm;
183	struct shash_alg *shash = crypto_shash_alg(tfm);
184
185	if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
186		return -ENOKEY;
 
187
188	if (shash->import)
189		return shash->import(desc, in);
 
 
 
 
 
190
191	memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm));
192	return 0;
193}
194EXPORT_SYMBOL_GPL(crypto_shash_import);
195
196static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
197{
198	struct crypto_shash *hash = __crypto_shash_cast(tfm);
199	struct shash_alg *alg = crypto_shash_alg(hash);
 
 
 
200
201	alg->exit_tfm(hash);
202}
203
204static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
205{
206	struct crypto_shash *hash = __crypto_shash_cast(tfm);
207	struct shash_alg *alg = crypto_shash_alg(hash);
 
208	int err;
209
210	hash->descsize = alg->descsize;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
211
212	shash_set_needkey(hash, alg);
 
 
213
214	if (alg->exit_tfm)
215		tfm->exit = crypto_shash_exit_tfm;
216
217	if (!alg->init_tfm)
218		return 0;
 
 
 
 
 
219
220	err = alg->init_tfm(hash);
221	if (err)
222		return err;
223
224	/* ->init_tfm() may have increased the descsize. */
225	if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) {
226		if (alg->exit_tfm)
227			alg->exit_tfm(hash);
228		return -EINVAL;
229	}
230
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
231	return 0;
232}
233
234static void crypto_shash_free_instance(struct crypto_instance *inst)
235{
236	struct shash_instance *shash = shash_instance(inst);
 
237
238	shash->free(shash);
 
 
 
 
 
 
239}
240
241static int __maybe_unused crypto_shash_report(
242	struct sk_buff *skb, struct crypto_alg *alg)
243{
244	struct crypto_report_hash rhash;
245	struct shash_alg *salg = __crypto_shash_alg(alg);
246
247	memset(&rhash, 0, sizeof(rhash));
248
249	strscpy(rhash.type, "shash", sizeof(rhash.type));
250
251	rhash.blocksize = alg->cra_blocksize;
252	rhash.digestsize = salg->digestsize;
253
254	return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
 
 
 
 
 
 
 
 
 
 
 
255}
 
256
257static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
258	__maybe_unused;
259static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
260{
261	struct shash_alg *salg = __crypto_shash_alg(alg);
262
263	seq_printf(m, "type         : shash\n");
264	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
265	seq_printf(m, "digestsize   : %u\n", salg->digestsize);
266}
267
268static int __maybe_unused crypto_shash_report_stat(
269	struct sk_buff *skb, struct crypto_alg *alg)
270{
271	return crypto_hash_report_stat(skb, alg, "shash");
272}
273
274const struct crypto_type crypto_shash_type = {
275	.extsize = crypto_alg_extsize,
276	.init_tfm = crypto_shash_init_tfm,
277	.free = crypto_shash_free_instance,
278#ifdef CONFIG_PROC_FS
279	.show = crypto_shash_show,
280#endif
281#if IS_ENABLED(CONFIG_CRYPTO_USER)
282	.report = crypto_shash_report,
283#endif
284#ifdef CONFIG_CRYPTO_STATS
285	.report_stat = crypto_shash_report_stat,
286#endif
287	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
288	.maskset = CRYPTO_ALG_TYPE_MASK,
289	.type = CRYPTO_ALG_TYPE_SHASH,
290	.tfmsize = offsetof(struct crypto_shash, base),
291};
292
293int crypto_grab_shash(struct crypto_shash_spawn *spawn,
294		      struct crypto_instance *inst,
295		      const char *name, u32 type, u32 mask)
296{
297	spawn->base.frontend = &crypto_shash_type;
298	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
299}
300EXPORT_SYMBOL_GPL(crypto_grab_shash);
301
302struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
303					u32 mask)
304{
305	return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
306}
307EXPORT_SYMBOL_GPL(crypto_alloc_shash);
308
309int crypto_has_shash(const char *alg_name, u32 type, u32 mask)
310{
311	return crypto_type_has_alg(alg_name, &crypto_shash_type, type, mask);
312}
313EXPORT_SYMBOL_GPL(crypto_has_shash);
314
315struct crypto_shash *crypto_clone_shash(struct crypto_shash *hash)
316{
317	struct crypto_tfm *tfm = crypto_shash_tfm(hash);
318	struct shash_alg *alg = crypto_shash_alg(hash);
319	struct crypto_shash *nhash;
320	int err;
321
322	if (!crypto_shash_alg_has_setkey(alg)) {
323		tfm = crypto_tfm_get(tfm);
324		if (IS_ERR(tfm))
325			return ERR_CAST(tfm);
326
327		return hash;
328	}
329
330	if (!alg->clone_tfm && (alg->init_tfm || alg->base.cra_init))
331		return ERR_PTR(-ENOSYS);
332
333	nhash = crypto_clone_tfm(&crypto_shash_type, tfm);
334	if (IS_ERR(nhash))
335		return nhash;
336
337	nhash->descsize = hash->descsize;
338
339	if (alg->clone_tfm) {
340		err = alg->clone_tfm(nhash, hash);
341		if (err) {
342			crypto_free_shash(nhash);
343			return ERR_PTR(err);
344		}
345	}
346
347	return nhash;
348}
349EXPORT_SYMBOL_GPL(crypto_clone_shash);
350
351int hash_prepare_alg(struct hash_alg_common *alg)
352{
353	struct crypto_istat_hash *istat = hash_get_stat(alg);
354	struct crypto_alg *base = &alg->base;
355
356	if (alg->digestsize > HASH_MAX_DIGESTSIZE)
357		return -EINVAL;
358
359	/* alignmask is not useful for hashes, so it is not supported. */
360	if (base->cra_alignmask)
361		return -EINVAL;
362
 
363	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
364
365	if (IS_ENABLED(CONFIG_CRYPTO_STATS))
366		memset(istat, 0, sizeof(*istat));
367
368	return 0;
369}
370
371static int shash_prepare_alg(struct shash_alg *alg)
372{
373	struct crypto_alg *base = &alg->halg.base;
374	int err;
375
376	if (alg->descsize > HASH_MAX_DESCSIZE)
377		return -EINVAL;
378
379	if ((alg->export && !alg->import) || (alg->import && !alg->export))
380		return -EINVAL;
381
382	err = hash_prepare_alg(&alg->halg);
383	if (err)
384		return err;
385
386	base->cra_type = &crypto_shash_type;
387	base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
388
389	/*
390	 * Handle missing optional functions.  For each one we can either
391	 * install a default here, or we can leave the pointer as NULL and check
392	 * the pointer for NULL in crypto_shash_*(), avoiding an indirect call
393	 * when the default behavior is desired.  For ->finup and ->digest we
394	 * install defaults, since for optimal performance algorithms should
395	 * implement these anyway.  On the other hand, for ->import and
396	 * ->export the common case and best performance comes from the simple
397	 * memcpy of the shash_desc_ctx, so when those pointers are NULL we
398	 * leave them NULL and provide the memcpy with no indirect call.
399	 */
400	if (!alg->finup)
401		alg->finup = shash_default_finup;
402	if (!alg->digest)
403		alg->digest = shash_default_digest;
404	if (!alg->export)
405		alg->halg.statesize = alg->descsize;
 
 
 
406	if (!alg->setkey)
407		alg->setkey = shash_no_setkey;
408
409	return 0;
410}
411
412int crypto_register_shash(struct shash_alg *alg)
413{
414	struct crypto_alg *base = &alg->base;
415	int err;
416
417	err = shash_prepare_alg(alg);
418	if (err)
419		return err;
420
421	return crypto_register_alg(base);
422}
423EXPORT_SYMBOL_GPL(crypto_register_shash);
424
425void crypto_unregister_shash(struct shash_alg *alg)
426{
427	crypto_unregister_alg(&alg->base);
428}
429EXPORT_SYMBOL_GPL(crypto_unregister_shash);
430
431int crypto_register_shashes(struct shash_alg *algs, int count)
432{
433	int i, ret;
434
435	for (i = 0; i < count; i++) {
436		ret = crypto_register_shash(&algs[i]);
437		if (ret)
438			goto err;
439	}
440
441	return 0;
442
443err:
444	for (--i; i >= 0; --i)
445		crypto_unregister_shash(&algs[i]);
446
447	return ret;
448}
449EXPORT_SYMBOL_GPL(crypto_register_shashes);
450
451void crypto_unregister_shashes(struct shash_alg *algs, int count)
452{
453	int i;
 
 
 
 
 
 
 
 
454
455	for (i = count - 1; i >= 0; --i)
456		crypto_unregister_shash(&algs[i]);
457}
458EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
459
460int shash_register_instance(struct crypto_template *tmpl,
461			    struct shash_instance *inst)
462{
463	int err;
464
465	if (WARN_ON(!inst->free))
466		return -EINVAL;
467
468	err = shash_prepare_alg(&inst->alg);
469	if (err)
470		return err;
471
472	return crypto_register_instance(tmpl, shash_crypto_instance(inst));
473}
474EXPORT_SYMBOL_GPL(shash_register_instance);
475
476void shash_free_singlespawn_instance(struct shash_instance *inst)
477{
478	crypto_drop_spawn(shash_instance_ctx(inst));
479	kfree(inst);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
480}
481EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance);
482
483MODULE_LICENSE("GPL");
484MODULE_DESCRIPTION("Synchronous cryptographic hash type");