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>
23 static const struct crypto_type crypto_shash_type
;
25 static int shash_no_setkey(struct crypto_shash
*tfm
, const u8
*key
,
31 static int shash_setkey_unaligned(struct crypto_shash
*tfm
, const u8
*key
,
34 struct shash_alg
*shash
= crypto_shash_alg(tfm
);
35 unsigned long alignmask
= crypto_shash_alignmask(tfm
);
37 u8
*buffer
, *alignbuffer
;
40 absize
= keylen
+ (alignmask
& ~(CRYPTO_MINALIGN
- 1));
41 buffer
= kmalloc(absize
, GFP_KERNEL
);
45 alignbuffer
= (u8
*)ALIGN((unsigned long)buffer
, alignmask
+ 1);
46 memcpy(alignbuffer
, key
, keylen
);
47 err
= shash
->setkey(tfm
, alignbuffer
, keylen
);
48 memset(alignbuffer
, 0, keylen
);
53 int crypto_shash_setkey(struct crypto_shash
*tfm
, const u8
*key
,
56 struct shash_alg
*shash
= crypto_shash_alg(tfm
);
57 unsigned long alignmask
= crypto_shash_alignmask(tfm
);
59 if ((unsigned long)key
& alignmask
)
60 return shash_setkey_unaligned(tfm
, key
, keylen
);
62 return shash
->setkey(tfm
, key
, keylen
);
64 EXPORT_SYMBOL_GPL(crypto_shash_setkey
);
66 static inline unsigned int shash_align_buffer_size(unsigned len
,
69 return len
+ (mask
& ~(__alignof__(u8
__attribute__ ((aligned
))) - 1));
72 static int shash_update_unaligned(struct shash_desc
*desc
, const u8
*data
,
75 struct crypto_shash
*tfm
= desc
->tfm
;
76 struct shash_alg
*shash
= crypto_shash_alg(tfm
);
77 unsigned long alignmask
= crypto_shash_alignmask(tfm
);
78 unsigned int unaligned_len
= alignmask
+ 1 -
79 ((unsigned long)data
& alignmask
);
80 u8 buf
[shash_align_buffer_size(unaligned_len
, alignmask
)]
81 __attribute__ ((aligned
));
83 if (unaligned_len
> len
)
86 memcpy(buf
, data
, unaligned_len
);
88 return shash
->update(desc
, buf
, unaligned_len
) ?:
89 shash
->update(desc
, data
+ unaligned_len
, len
- unaligned_len
);
92 int crypto_shash_update(struct shash_desc
*desc
, const u8
*data
,
95 struct crypto_shash
*tfm
= desc
->tfm
;
96 struct shash_alg
*shash
= crypto_shash_alg(tfm
);
97 unsigned long alignmask
= crypto_shash_alignmask(tfm
);
99 if ((unsigned long)data
& alignmask
)
100 return shash_update_unaligned(desc
, data
, len
);
102 return shash
->update(desc
, data
, len
);
104 EXPORT_SYMBOL_GPL(crypto_shash_update
);
106 static int shash_final_unaligned(struct shash_desc
*desc
, u8
*out
)
108 struct crypto_shash
*tfm
= desc
->tfm
;
109 unsigned long alignmask
= crypto_shash_alignmask(tfm
);
110 struct shash_alg
*shash
= crypto_shash_alg(tfm
);
111 unsigned int ds
= crypto_shash_digestsize(tfm
);
112 u8 buf
[shash_align_buffer_size(ds
, alignmask
)]
113 __attribute__ ((aligned
));
116 err
= shash
->final(desc
, buf
);
117 memcpy(out
, buf
, ds
);
121 int crypto_shash_final(struct shash_desc
*desc
, u8
*out
)
123 struct crypto_shash
*tfm
= desc
->tfm
;
124 struct shash_alg
*shash
= crypto_shash_alg(tfm
);
125 unsigned long alignmask
= crypto_shash_alignmask(tfm
);
127 if ((unsigned long)out
& alignmask
)
128 return shash_final_unaligned(desc
, out
);
130 return shash
->final(desc
, out
);
132 EXPORT_SYMBOL_GPL(crypto_shash_final
);
134 static int shash_finup_unaligned(struct shash_desc
*desc
, const u8
*data
,
135 unsigned int len
, u8
*out
)
137 return crypto_shash_update(desc
, data
, len
) ?:
138 crypto_shash_final(desc
, out
);
141 int crypto_shash_finup(struct shash_desc
*desc
, const u8
*data
,
142 unsigned int len
, u8
*out
)
144 struct crypto_shash
*tfm
= desc
->tfm
;
145 struct shash_alg
*shash
= crypto_shash_alg(tfm
);
146 unsigned long alignmask
= crypto_shash_alignmask(tfm
);
148 if (((unsigned long)data
| (unsigned long)out
) & alignmask
)
149 return shash_finup_unaligned(desc
, data
, len
, out
);
151 return shash
->finup(desc
, data
, len
, out
);
153 EXPORT_SYMBOL_GPL(crypto_shash_finup
);
155 static int shash_digest_unaligned(struct shash_desc
*desc
, const u8
*data
,
156 unsigned int len
, u8
*out
)
158 return crypto_shash_init(desc
) ?:
159 crypto_shash_finup(desc
, data
, len
, out
);
162 int crypto_shash_digest(struct shash_desc
*desc
, const u8
*data
,
163 unsigned int len
, u8
*out
)
165 struct crypto_shash
*tfm
= desc
->tfm
;
166 struct shash_alg
*shash
= crypto_shash_alg(tfm
);
167 unsigned long alignmask
= crypto_shash_alignmask(tfm
);
169 if (((unsigned long)data
| (unsigned long)out
) & alignmask
)
170 return shash_digest_unaligned(desc
, data
, len
, out
);
172 return shash
->digest(desc
, data
, len
, out
);
174 EXPORT_SYMBOL_GPL(crypto_shash_digest
);
176 static int shash_no_export(struct shash_desc
*desc
, void *out
)
181 static int shash_no_import(struct shash_desc
*desc
, const void *in
)
186 static int shash_async_setkey(struct crypto_ahash
*tfm
, const u8
*key
,
189 struct crypto_shash
**ctx
= crypto_ahash_ctx(tfm
);
191 return crypto_shash_setkey(*ctx
, key
, keylen
);
194 static int shash_async_init(struct ahash_request
*req
)
196 struct crypto_shash
**ctx
= crypto_ahash_ctx(crypto_ahash_reqtfm(req
));
197 struct shash_desc
*desc
= ahash_request_ctx(req
);
200 desc
->flags
= req
->base
.flags
;
202 return crypto_shash_init(desc
);
205 int shash_ahash_update(struct ahash_request
*req
, struct shash_desc
*desc
)
207 struct crypto_hash_walk walk
;
210 for (nbytes
= crypto_hash_walk_first(req
, &walk
); nbytes
> 0;
211 nbytes
= crypto_hash_walk_done(&walk
, nbytes
))
212 nbytes
= crypto_shash_update(desc
, walk
.data
, nbytes
);
216 EXPORT_SYMBOL_GPL(shash_ahash_update
);
218 static int shash_async_update(struct ahash_request
*req
)
220 return shash_ahash_update(req
, ahash_request_ctx(req
));
223 static int shash_async_final(struct ahash_request
*req
)
225 return crypto_shash_final(ahash_request_ctx(req
), req
->result
);
228 int shash_ahash_digest(struct ahash_request
*req
, struct shash_desc
*desc
)
230 struct scatterlist
*sg
= req
->src
;
231 unsigned int offset
= sg
->offset
;
232 unsigned int nbytes
= req
->nbytes
;
235 if (nbytes
< min(sg
->length
, ((unsigned int)(PAGE_SIZE
)) - offset
)) {
238 data
= crypto_kmap(sg_page(sg
), 0);
239 err
= crypto_shash_digest(desc
, data
+ offset
, nbytes
,
241 crypto_kunmap(data
, 0);
242 crypto_yield(desc
->flags
);
244 err
= crypto_shash_init(desc
) ?:
245 shash_ahash_update(req
, desc
) ?:
246 crypto_shash_final(desc
, req
->result
);
250 EXPORT_SYMBOL_GPL(shash_ahash_digest
);
252 static int shash_async_digest(struct ahash_request
*req
)
254 struct crypto_shash
**ctx
= crypto_ahash_ctx(crypto_ahash_reqtfm(req
));
255 struct shash_desc
*desc
= ahash_request_ctx(req
);
258 desc
->flags
= req
->base
.flags
;
260 return shash_ahash_digest(req
, desc
);
263 static void crypto_exit_shash_ops_async(struct crypto_tfm
*tfm
)
265 struct crypto_shash
**ctx
= crypto_tfm_ctx(tfm
);
267 crypto_free_shash(*ctx
);
270 static int crypto_init_shash_ops_async(struct crypto_tfm
*tfm
)
272 struct crypto_alg
*calg
= tfm
->__crt_alg
;
273 struct shash_alg
*alg
= __crypto_shash_alg(calg
);
274 struct ahash_tfm
*crt
= &tfm
->crt_ahash
;
275 struct crypto_shash
**ctx
= crypto_tfm_ctx(tfm
);
276 struct crypto_shash
*shash
;
278 if (!crypto_mod_get(calg
))
281 shash
= crypto_create_tfm(calg
, &crypto_shash_type
);
283 crypto_mod_put(calg
);
284 return PTR_ERR(shash
);
288 tfm
->exit
= crypto_exit_shash_ops_async
;
290 crt
->init
= shash_async_init
;
291 crt
->update
= shash_async_update
;
292 crt
->final
= shash_async_final
;
293 crt
->digest
= shash_async_digest
;
294 crt
->setkey
= shash_async_setkey
;
296 crt
->digestsize
= alg
->digestsize
;
297 crt
->reqsize
= sizeof(struct shash_desc
) + crypto_shash_descsize(shash
);
302 static int shash_compat_setkey(struct crypto_hash
*tfm
, const u8
*key
,
305 struct shash_desc
**descp
= crypto_hash_ctx(tfm
);
306 struct shash_desc
*desc
= *descp
;
308 return crypto_shash_setkey(desc
->tfm
, key
, keylen
);
311 static int shash_compat_init(struct hash_desc
*hdesc
)
313 struct shash_desc
**descp
= crypto_hash_ctx(hdesc
->tfm
);
314 struct shash_desc
*desc
= *descp
;
316 desc
->flags
= hdesc
->flags
;
318 return crypto_shash_init(desc
);
321 static int shash_compat_update(struct hash_desc
*hdesc
, struct scatterlist
*sg
,
324 struct shash_desc
**descp
= crypto_hash_ctx(hdesc
->tfm
);
325 struct shash_desc
*desc
= *descp
;
326 struct crypto_hash_walk walk
;
329 for (nbytes
= crypto_hash_walk_first_compat(hdesc
, &walk
, sg
, len
);
330 nbytes
> 0; nbytes
= crypto_hash_walk_done(&walk
, nbytes
))
331 nbytes
= crypto_shash_update(desc
, walk
.data
, nbytes
);
336 static int shash_compat_final(struct hash_desc
*hdesc
, u8
*out
)
338 struct shash_desc
**descp
= crypto_hash_ctx(hdesc
->tfm
);
340 return crypto_shash_final(*descp
, out
);
343 static int shash_compat_digest(struct hash_desc
*hdesc
, struct scatterlist
*sg
,
344 unsigned int nbytes
, u8
*out
)
346 unsigned int offset
= sg
->offset
;
349 if (nbytes
< min(sg
->length
, ((unsigned int)(PAGE_SIZE
)) - offset
)) {
350 struct shash_desc
**descp
= crypto_hash_ctx(hdesc
->tfm
);
351 struct shash_desc
*desc
= *descp
;
354 desc
->flags
= hdesc
->flags
;
356 data
= crypto_kmap(sg_page(sg
), 0);
357 err
= crypto_shash_digest(desc
, data
+ offset
, nbytes
, out
);
358 crypto_kunmap(data
, 0);
359 crypto_yield(desc
->flags
);
363 err
= shash_compat_init(hdesc
);
367 err
= shash_compat_update(hdesc
, sg
, nbytes
);
371 err
= shash_compat_final(hdesc
, out
);
377 static void crypto_exit_shash_ops_compat(struct crypto_tfm
*tfm
)
379 struct shash_desc
**descp
= crypto_tfm_ctx(tfm
);
380 struct shash_desc
*desc
= *descp
;
382 crypto_free_shash(desc
->tfm
);
386 static int crypto_init_shash_ops_compat(struct crypto_tfm
*tfm
)
388 struct hash_tfm
*crt
= &tfm
->crt_hash
;
389 struct crypto_alg
*calg
= tfm
->__crt_alg
;
390 struct shash_alg
*alg
= __crypto_shash_alg(calg
);
391 struct shash_desc
**descp
= crypto_tfm_ctx(tfm
);
392 struct crypto_shash
*shash
;
393 struct shash_desc
*desc
;
395 if (!crypto_mod_get(calg
))
398 shash
= crypto_create_tfm(calg
, &crypto_shash_type
);
400 crypto_mod_put(calg
);
401 return PTR_ERR(shash
);
404 desc
= kmalloc(sizeof(*desc
) + crypto_shash_descsize(shash
),
407 crypto_free_shash(shash
);
413 tfm
->exit
= crypto_exit_shash_ops_compat
;
415 crt
->init
= shash_compat_init
;
416 crt
->update
= shash_compat_update
;
417 crt
->final
= shash_compat_final
;
418 crt
->digest
= shash_compat_digest
;
419 crt
->setkey
= shash_compat_setkey
;
421 crt
->digestsize
= alg
->digestsize
;
426 static int crypto_init_shash_ops(struct crypto_tfm
*tfm
, u32 type
, u32 mask
)
428 switch (mask
& CRYPTO_ALG_TYPE_MASK
) {
429 case CRYPTO_ALG_TYPE_HASH_MASK
:
430 return crypto_init_shash_ops_compat(tfm
);
431 case CRYPTO_ALG_TYPE_AHASH_MASK
:
432 return crypto_init_shash_ops_async(tfm
);
438 static unsigned int crypto_shash_ctxsize(struct crypto_alg
*alg
, u32 type
,
441 switch (mask
& CRYPTO_ALG_TYPE_MASK
) {
442 case CRYPTO_ALG_TYPE_HASH_MASK
:
443 return sizeof(struct shash_desc
*);
444 case CRYPTO_ALG_TYPE_AHASH_MASK
:
445 return sizeof(struct crypto_shash
*);
451 static int crypto_shash_init_tfm(struct crypto_tfm
*tfm
,
452 const struct crypto_type
*frontend
)
454 struct crypto_shash
*hash
= __crypto_shash_cast(tfm
);
456 hash
->descsize
= crypto_shash_alg(hash
)->descsize
;
460 static unsigned int crypto_shash_extsize(struct crypto_alg
*alg
,
461 const struct crypto_type
*frontend
)
463 return alg
->cra_ctxsize
;
466 static void crypto_shash_show(struct seq_file
*m
, struct crypto_alg
*alg
)
467 __attribute__ ((unused
));
468 static void crypto_shash_show(struct seq_file
*m
, struct crypto_alg
*alg
)
470 struct shash_alg
*salg
= __crypto_shash_alg(alg
);
472 seq_printf(m
, "type : shash\n");
473 seq_printf(m
, "blocksize : %u\n", alg
->cra_blocksize
);
474 seq_printf(m
, "digestsize : %u\n", salg
->digestsize
);
477 static const struct crypto_type crypto_shash_type
= {
478 .ctxsize
= crypto_shash_ctxsize
,
479 .extsize
= crypto_shash_extsize
,
480 .init
= crypto_init_shash_ops
,
481 .init_tfm
= crypto_shash_init_tfm
,
482 #ifdef CONFIG_PROC_FS
483 .show
= crypto_shash_show
,
485 .maskclear
= ~CRYPTO_ALG_TYPE_MASK
,
486 .maskset
= CRYPTO_ALG_TYPE_MASK
,
487 .type
= CRYPTO_ALG_TYPE_SHASH
,
488 .tfmsize
= offsetof(struct crypto_shash
, base
),
491 struct crypto_shash
*crypto_alloc_shash(const char *alg_name
, u32 type
,
494 return crypto_alloc_tfm(alg_name
, &crypto_shash_type
, type
, mask
);
496 EXPORT_SYMBOL_GPL(crypto_alloc_shash
);
498 static int shash_prepare_alg(struct shash_alg
*alg
)
500 struct crypto_alg
*base
= &alg
->base
;
502 if (alg
->digestsize
> PAGE_SIZE
/ 8 ||
503 alg
->descsize
> PAGE_SIZE
/ 8 ||
504 alg
->statesize
> PAGE_SIZE
/ 8)
507 base
->cra_type
= &crypto_shash_type
;
508 base
->cra_flags
&= ~CRYPTO_ALG_TYPE_MASK
;
509 base
->cra_flags
|= CRYPTO_ALG_TYPE_SHASH
;
512 alg
->finup
= shash_finup_unaligned
;
514 alg
->digest
= shash_digest_unaligned
;
516 alg
->import
= shash_no_import
;
518 alg
->export
= shash_no_export
;
520 alg
->setkey
= shash_no_setkey
;
525 int crypto_register_shash(struct shash_alg
*alg
)
527 struct crypto_alg
*base
= &alg
->base
;
530 err
= shash_prepare_alg(alg
);
534 return crypto_register_alg(base
);
536 EXPORT_SYMBOL_GPL(crypto_register_shash
);
538 int crypto_unregister_shash(struct shash_alg
*alg
)
540 return crypto_unregister_alg(&alg
->base
);
542 EXPORT_SYMBOL_GPL(crypto_unregister_shash
);
544 int shash_register_instance(struct crypto_template
*tmpl
,
545 struct shash_instance
*inst
)
549 err
= shash_prepare_alg(&inst
->alg
);
553 return crypto_register_instance(tmpl
, shash_crypto_instance(inst
));
555 EXPORT_SYMBOL_GPL(shash_register_instance
);
557 void shash_free_instance(struct crypto_instance
*inst
)
559 crypto_drop_spawn(crypto_instance_ctx(inst
));
560 kfree(shash_instance(inst
));
562 EXPORT_SYMBOL_GPL(shash_free_instance
);
564 int crypto_init_shash_spawn(struct crypto_shash_spawn
*spawn
,
565 struct shash_alg
*alg
,
566 struct crypto_instance
*inst
)
568 return crypto_init_spawn2(&spawn
->base
, &alg
->base
, inst
,
571 EXPORT_SYMBOL_GPL(crypto_init_shash_spawn
);
573 struct shash_alg
*shash_attr_alg(struct rtattr
*rta
, u32 type
, u32 mask
)
575 struct crypto_alg
*alg
;
577 alg
= crypto_attr_alg2(rta
, &crypto_shash_type
, type
, mask
);
578 return IS_ERR(alg
) ? ERR_CAST(alg
) :
579 container_of(alg
, struct shash_alg
, base
);
581 EXPORT_SYMBOL_GPL(shash_attr_alg
);
583 MODULE_LICENSE("GPL");
584 MODULE_DESCRIPTION("Synchronous cryptographic hash type");