2 * Synchronous Cryptographic Hash operations.
4 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
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)
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>
25 static const struct crypto_type crypto_shash_type;
27 int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
32 EXPORT_SYMBOL_GPL(shash_no_setkey);
34 static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
37 struct shash_alg *shash = crypto_shash_alg(tfm);
38 unsigned long alignmask = crypto_shash_alignmask(tfm);
40 u8 *buffer, *alignbuffer;
43 absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
44 buffer = kmalloc(absize, GFP_KERNEL);
48 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
49 memcpy(alignbuffer, key, keylen);
50 err = shash->setkey(tfm, alignbuffer, keylen);
55 int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
58 struct shash_alg *shash = crypto_shash_alg(tfm);
59 unsigned long alignmask = crypto_shash_alignmask(tfm);
62 if ((unsigned long)key & alignmask)
63 err = shash_setkey_unaligned(tfm, key, keylen);
65 err = shash->setkey(tfm, key, keylen);
70 crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
73 EXPORT_SYMBOL_GPL(crypto_shash_setkey);
75 static inline unsigned int shash_align_buffer_size(unsigned len,
78 return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
81 static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
84 struct crypto_shash *tfm = desc->tfm;
85 struct shash_alg *shash = crypto_shash_alg(tfm);
86 unsigned long alignmask = crypto_shash_alignmask(tfm);
87 unsigned int unaligned_len = alignmask + 1 -
88 ((unsigned long)data & alignmask);
89 u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
90 __attribute__ ((aligned));
91 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
94 if (unaligned_len > len)
97 memcpy(buf, data, unaligned_len);
98 err = shash->update(desc, buf, unaligned_len);
99 memset(buf, 0, unaligned_len);
102 shash->update(desc, data + unaligned_len, len - unaligned_len);
105 int crypto_shash_update(struct shash_desc *desc, const u8 *data,
108 struct crypto_shash *tfm = desc->tfm;
109 struct shash_alg *shash = crypto_shash_alg(tfm);
110 unsigned long alignmask = crypto_shash_alignmask(tfm);
112 if ((unsigned long)data & alignmask)
113 return shash_update_unaligned(desc, data, len);
115 return shash->update(desc, data, len);
117 EXPORT_SYMBOL_GPL(crypto_shash_update);
119 static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
121 struct crypto_shash *tfm = desc->tfm;
122 unsigned long alignmask = crypto_shash_alignmask(tfm);
123 struct shash_alg *shash = crypto_shash_alg(tfm);
124 unsigned int ds = crypto_shash_digestsize(tfm);
125 u8 ubuf[shash_align_buffer_size(ds, alignmask)]
126 __attribute__ ((aligned));
127 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
130 err = shash->final(desc, buf);
134 memcpy(out, buf, ds);
141 int crypto_shash_final(struct shash_desc *desc, u8 *out)
143 struct crypto_shash *tfm = desc->tfm;
144 struct shash_alg *shash = crypto_shash_alg(tfm);
145 unsigned long alignmask = crypto_shash_alignmask(tfm);
147 if ((unsigned long)out & alignmask)
148 return shash_final_unaligned(desc, out);
150 return shash->final(desc, out);
152 EXPORT_SYMBOL_GPL(crypto_shash_final);
154 static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
155 unsigned int len, u8 *out)
157 return crypto_shash_update(desc, data, len) ?:
158 crypto_shash_final(desc, out);
161 int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
162 unsigned int len, u8 *out)
164 struct crypto_shash *tfm = desc->tfm;
165 struct shash_alg *shash = crypto_shash_alg(tfm);
166 unsigned long alignmask = crypto_shash_alignmask(tfm);
168 if (((unsigned long)data | (unsigned long)out) & alignmask)
169 return shash_finup_unaligned(desc, data, len, out);
171 return shash->finup(desc, data, len, out);
173 EXPORT_SYMBOL_GPL(crypto_shash_finup);
175 static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
176 unsigned int len, u8 *out)
178 return crypto_shash_init(desc) ?:
179 crypto_shash_finup(desc, data, len, out);
182 int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
183 unsigned int len, u8 *out)
185 struct crypto_shash *tfm = desc->tfm;
186 struct shash_alg *shash = crypto_shash_alg(tfm);
187 unsigned long alignmask = crypto_shash_alignmask(tfm);
189 if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
192 if (((unsigned long)data | (unsigned long)out) & alignmask)
193 return shash_digest_unaligned(desc, data, len, out);
195 return shash->digest(desc, data, len, out);
197 EXPORT_SYMBOL_GPL(crypto_shash_digest);
199 static int shash_default_export(struct shash_desc *desc, void *out)
201 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
205 static int shash_default_import(struct shash_desc *desc, const void *in)
207 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
211 static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
214 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
216 return crypto_shash_setkey(*ctx, key, keylen);
219 static int shash_async_init(struct ahash_request *req)
221 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
222 struct shash_desc *desc = ahash_request_ctx(req);
225 desc->flags = req->base.flags;
227 return crypto_shash_init(desc);
230 int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
232 struct crypto_hash_walk walk;
235 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
236 nbytes = crypto_hash_walk_done(&walk, nbytes))
237 nbytes = crypto_shash_update(desc, walk.data, nbytes);
241 EXPORT_SYMBOL_GPL(shash_ahash_update);
243 static int shash_async_update(struct ahash_request *req)
245 return shash_ahash_update(req, ahash_request_ctx(req));
248 static int shash_async_final(struct ahash_request *req)
250 return crypto_shash_final(ahash_request_ctx(req), req->result);
253 int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
255 struct crypto_hash_walk walk;
258 nbytes = crypto_hash_walk_first(req, &walk);
260 return crypto_shash_final(desc, req->result);
263 nbytes = crypto_hash_walk_last(&walk) ?
264 crypto_shash_finup(desc, walk.data, nbytes,
266 crypto_shash_update(desc, walk.data, nbytes);
267 nbytes = crypto_hash_walk_done(&walk, nbytes);
268 } while (nbytes > 0);
272 EXPORT_SYMBOL_GPL(shash_ahash_finup);
274 static int shash_async_finup(struct ahash_request *req)
276 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
277 struct shash_desc *desc = ahash_request_ctx(req);
280 desc->flags = req->base.flags;
282 return shash_ahash_finup(req, desc);
285 int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
287 unsigned int nbytes = req->nbytes;
288 struct scatterlist *sg;
293 (sg = req->src, offset = sg->offset,
294 nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
297 data = crypto_kmap(sg_page(sg), 0);
298 err = crypto_shash_digest(desc, data + offset, nbytes,
300 crypto_kunmap(data, 0);
301 crypto_yield(desc->flags);
303 err = crypto_shash_init(desc) ?:
304 shash_ahash_finup(req, desc);
308 EXPORT_SYMBOL_GPL(shash_ahash_digest);
310 static int shash_async_digest(struct ahash_request *req)
312 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
313 struct shash_desc *desc = ahash_request_ctx(req);
316 desc->flags = req->base.flags;
318 return shash_ahash_digest(req, desc);
321 static int shash_async_export(struct ahash_request *req, void *out)
323 return crypto_shash_export(ahash_request_ctx(req), out);
326 static int shash_async_import(struct ahash_request *req, const void *in)
328 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
329 struct shash_desc *desc = ahash_request_ctx(req);
332 desc->flags = req->base.flags;
334 return crypto_shash_import(desc, in);
337 static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
339 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
341 crypto_free_shash(*ctx);
344 int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
346 struct crypto_alg *calg = tfm->__crt_alg;
347 struct shash_alg *alg = __crypto_shash_alg(calg);
348 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
349 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
350 struct crypto_shash *shash;
352 if (!crypto_mod_get(calg))
355 shash = crypto_create_tfm(calg, &crypto_shash_type);
357 crypto_mod_put(calg);
358 return PTR_ERR(shash);
362 tfm->exit = crypto_exit_shash_ops_async;
364 crt->init = shash_async_init;
365 crt->update = shash_async_update;
366 crt->final = shash_async_final;
367 crt->finup = shash_async_finup;
368 crt->digest = shash_async_digest;
369 crt->setkey = shash_async_setkey;
371 crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
372 CRYPTO_TFM_NEED_KEY);
375 crt->export = shash_async_export;
377 crt->import = shash_async_import;
379 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
384 static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
387 struct shash_desc **descp = crypto_hash_ctx(tfm);
388 struct shash_desc *desc = *descp;
390 return crypto_shash_setkey(desc->tfm, key, keylen);
393 static int shash_compat_init(struct hash_desc *hdesc)
395 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
396 struct shash_desc *desc = *descp;
398 desc->flags = hdesc->flags;
400 return crypto_shash_init(desc);
403 static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
406 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
407 struct shash_desc *desc = *descp;
408 struct crypto_hash_walk walk;
411 for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
412 nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
413 nbytes = crypto_shash_update(desc, walk.data, nbytes);
418 static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
420 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
422 return crypto_shash_final(*descp, out);
425 static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
426 unsigned int nbytes, u8 *out)
428 unsigned int offset = sg->offset;
431 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
432 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
433 struct shash_desc *desc = *descp;
436 desc->flags = hdesc->flags;
438 data = crypto_kmap(sg_page(sg), 0);
439 err = crypto_shash_digest(desc, data + offset, nbytes, out);
440 crypto_kunmap(data, 0);
441 crypto_yield(desc->flags);
445 err = shash_compat_init(hdesc);
449 err = shash_compat_update(hdesc, sg, nbytes);
453 err = shash_compat_final(hdesc, out);
459 static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
461 struct shash_desc **descp = crypto_tfm_ctx(tfm);
462 struct shash_desc *desc = *descp;
464 crypto_free_shash(desc->tfm);
468 static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
470 struct hash_tfm *crt = &tfm->crt_hash;
471 struct crypto_alg *calg = tfm->__crt_alg;
472 struct shash_alg *alg = __crypto_shash_alg(calg);
473 struct shash_desc **descp = crypto_tfm_ctx(tfm);
474 struct crypto_shash *shash;
475 struct shash_desc *desc;
477 if (!crypto_mod_get(calg))
480 shash = crypto_create_tfm(calg, &crypto_shash_type);
482 crypto_mod_put(calg);
483 return PTR_ERR(shash);
486 desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
489 crypto_free_shash(shash);
495 tfm->exit = crypto_exit_shash_ops_compat;
497 crt->init = shash_compat_init;
498 crt->update = shash_compat_update;
499 crt->final = shash_compat_final;
500 crt->digest = shash_compat_digest;
501 crt->setkey = shash_compat_setkey;
503 crt->digestsize = alg->digestsize;
508 static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
510 switch (mask & CRYPTO_ALG_TYPE_MASK) {
511 case CRYPTO_ALG_TYPE_HASH_MASK:
512 return crypto_init_shash_ops_compat(tfm);
518 static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
521 switch (mask & CRYPTO_ALG_TYPE_MASK) {
522 case CRYPTO_ALG_TYPE_HASH_MASK:
523 return sizeof(struct shash_desc *);
529 static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
531 struct crypto_shash *hash = __crypto_shash_cast(tfm);
532 struct shash_alg *alg = crypto_shash_alg(hash);
534 hash->descsize = alg->descsize;
536 if (crypto_shash_alg_has_setkey(alg) &&
537 !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
538 crypto_shash_set_flags(hash, CRYPTO_TFM_NEED_KEY);
543 static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
545 return alg->cra_ctxsize;
549 static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
551 struct crypto_report_hash rhash;
552 struct shash_alg *salg = __crypto_shash_alg(alg);
554 strncpy(rhash.type, "shash", sizeof(rhash.type));
556 rhash.blocksize = alg->cra_blocksize;
557 rhash.digestsize = salg->digestsize;
559 NLA_PUT(skb, CRYPTOCFGA_REPORT_HASH,
560 sizeof(struct crypto_report_hash), &rhash);
568 static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
574 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
575 __attribute__ ((unused));
576 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
578 struct shash_alg *salg = __crypto_shash_alg(alg);
580 seq_printf(m, "type : shash\n");
581 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
582 seq_printf(m, "digestsize : %u\n", salg->digestsize);
585 static const struct crypto_type crypto_shash_type = {
586 .ctxsize = crypto_shash_ctxsize,
587 .extsize = crypto_shash_extsize,
588 .init = crypto_init_shash_ops,
589 .init_tfm = crypto_shash_init_tfm,
590 #ifdef CONFIG_PROC_FS
591 .show = crypto_shash_show,
593 .report = crypto_shash_report,
594 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
595 .maskset = CRYPTO_ALG_TYPE_MASK,
596 .type = CRYPTO_ALG_TYPE_SHASH,
597 .tfmsize = offsetof(struct crypto_shash, base),
600 struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
603 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
605 EXPORT_SYMBOL_GPL(crypto_alloc_shash);
607 static int shash_prepare_alg(struct shash_alg *alg)
609 struct crypto_alg *base = &alg->base;
611 if (alg->digestsize > PAGE_SIZE / 8 ||
612 alg->descsize > PAGE_SIZE / 8 ||
613 alg->statesize > PAGE_SIZE / 8)
616 base->cra_type = &crypto_shash_type;
617 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
618 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
621 alg->finup = shash_finup_unaligned;
623 alg->digest = shash_digest_unaligned;
625 alg->export = shash_default_export;
626 alg->import = shash_default_import;
627 alg->statesize = alg->descsize;
630 alg->setkey = shash_no_setkey;
635 int crypto_register_shash(struct shash_alg *alg)
637 struct crypto_alg *base = &alg->base;
640 err = shash_prepare_alg(alg);
644 return crypto_register_alg(base);
646 EXPORT_SYMBOL_GPL(crypto_register_shash);
648 int crypto_unregister_shash(struct shash_alg *alg)
650 return crypto_unregister_alg(&alg->base);
652 EXPORT_SYMBOL_GPL(crypto_unregister_shash);
654 int shash_register_instance(struct crypto_template *tmpl,
655 struct shash_instance *inst)
659 err = shash_prepare_alg(&inst->alg);
663 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
665 EXPORT_SYMBOL_GPL(shash_register_instance);
667 void shash_free_instance(struct crypto_instance *inst)
669 crypto_drop_spawn(crypto_instance_ctx(inst));
670 kfree(shash_instance(inst));
672 EXPORT_SYMBOL_GPL(shash_free_instance);
674 int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
675 struct shash_alg *alg,
676 struct crypto_instance *inst)
678 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
681 EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
683 struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
685 struct crypto_alg *alg;
687 alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
688 return IS_ERR(alg) ? ERR_CAST(alg) :
689 container_of(alg, struct shash_alg, base);
691 EXPORT_SYMBOL_GPL(shash_attr_alg);
693 MODULE_LICENSE("GPL");
694 MODULE_DESCRIPTION("Synchronous cryptographic hash type");