Root/crypto/shash.c

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
21#include "internal.h"
22
23static const struct crypto_type crypto_shash_type;
24
25static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
26               unsigned int keylen)
27{
28    return -ENOSYS;
29}
30
31static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
32                  unsigned int keylen)
33{
34    struct shash_alg *shash = crypto_shash_alg(tfm);
35    unsigned long alignmask = crypto_shash_alignmask(tfm);
36    unsigned long absize;
37    u8 *buffer, *alignbuffer;
38    int err;
39
40    absize = keylen + (alignmask & ~(CRYPTO_MINALIGN - 1));
41    buffer = kmalloc(absize, GFP_KERNEL);
42    if (!buffer)
43        return -ENOMEM;
44
45    alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
46    memcpy(alignbuffer, key, keylen);
47    err = shash->setkey(tfm, alignbuffer, keylen);
48    kzfree(buffer);
49    return err;
50}
51
52int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
53            unsigned int keylen)
54{
55    struct shash_alg *shash = crypto_shash_alg(tfm);
56    unsigned long alignmask = crypto_shash_alignmask(tfm);
57
58    if ((unsigned long)key & alignmask)
59        return shash_setkey_unaligned(tfm, key, keylen);
60
61    return shash->setkey(tfm, key, keylen);
62}
63EXPORT_SYMBOL_GPL(crypto_shash_setkey);
64
65static inline unsigned int shash_align_buffer_size(unsigned len,
66                           unsigned long mask)
67{
68    return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
69}
70
71static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
72                  unsigned int len)
73{
74    struct crypto_shash *tfm = desc->tfm;
75    struct shash_alg *shash = crypto_shash_alg(tfm);
76    unsigned long alignmask = crypto_shash_alignmask(tfm);
77    unsigned int unaligned_len = alignmask + 1 -
78                     ((unsigned long)data & alignmask);
79    u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
80        __attribute__ ((aligned));
81    u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
82    int err;
83
84    if (unaligned_len > len)
85        unaligned_len = len;
86
87    memcpy(buf, data, unaligned_len);
88    err = shash->update(desc, buf, unaligned_len);
89    memset(buf, 0, unaligned_len);
90
91    return err ?:
92           shash->update(desc, data + unaligned_len, len - unaligned_len);
93}
94
95int crypto_shash_update(struct shash_desc *desc, const u8 *data,
96            unsigned int len)
97{
98    struct crypto_shash *tfm = desc->tfm;
99    struct shash_alg *shash = crypto_shash_alg(tfm);
100    unsigned long alignmask = crypto_shash_alignmask(tfm);
101
102    if ((unsigned long)data & alignmask)
103        return shash_update_unaligned(desc, data, len);
104
105    return shash->update(desc, data, len);
106}
107EXPORT_SYMBOL_GPL(crypto_shash_update);
108
109static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
110{
111    struct crypto_shash *tfm = desc->tfm;
112    unsigned long alignmask = crypto_shash_alignmask(tfm);
113    struct shash_alg *shash = crypto_shash_alg(tfm);
114    unsigned int ds = crypto_shash_digestsize(tfm);
115    u8 ubuf[shash_align_buffer_size(ds, alignmask)]
116        __attribute__ ((aligned));
117    u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
118    int err;
119
120    err = shash->final(desc, buf);
121    if (err)
122        goto out;
123
124    memcpy(out, buf, ds);
125
126out:
127    memset(buf, 0, ds);
128    return err;
129}
130
131int crypto_shash_final(struct shash_desc *desc, u8 *out)
132{
133    struct crypto_shash *tfm = desc->tfm;
134    struct shash_alg *shash = crypto_shash_alg(tfm);
135    unsigned long alignmask = crypto_shash_alignmask(tfm);
136
137    if ((unsigned long)out & alignmask)
138        return shash_final_unaligned(desc, out);
139
140    return shash->final(desc, out);
141}
142EXPORT_SYMBOL_GPL(crypto_shash_final);
143
144static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
145                 unsigned int len, u8 *out)
146{
147    return crypto_shash_update(desc, data, len) ?:
148           crypto_shash_final(desc, out);
149}
150
151int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
152               unsigned int len, u8 *out)
153{
154    struct crypto_shash *tfm = desc->tfm;
155    struct shash_alg *shash = crypto_shash_alg(tfm);
156    unsigned long alignmask = crypto_shash_alignmask(tfm);
157
158    if (((unsigned long)data | (unsigned long)out) & alignmask)
159        return shash_finup_unaligned(desc, data, len, out);
160
161    return shash->finup(desc, data, len, out);
162}
163EXPORT_SYMBOL_GPL(crypto_shash_finup);
164
165static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
166                  unsigned int len, u8 *out)
167{
168    return crypto_shash_init(desc) ?:
169           crypto_shash_finup(desc, data, len, out);
170}
171
172int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
173            unsigned int len, u8 *out)
174{
175    struct crypto_shash *tfm = desc->tfm;
176    struct shash_alg *shash = crypto_shash_alg(tfm);
177    unsigned long alignmask = crypto_shash_alignmask(tfm);
178
179    if (((unsigned long)data | (unsigned long)out) & alignmask)
180        return shash_digest_unaligned(desc, data, len, out);
181
182    return shash->digest(desc, data, len, out);
183}
184EXPORT_SYMBOL_GPL(crypto_shash_digest);
185
186static int shash_default_export(struct shash_desc *desc, void *out)
187{
188    memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
189    return 0;
190}
191
192static int shash_default_import(struct shash_desc *desc, const void *in)
193{
194    memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
195    return 0;
196}
197
198static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
199                  unsigned int keylen)
200{
201    struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
202
203    return crypto_shash_setkey(*ctx, key, keylen);
204}
205
206static int shash_async_init(struct ahash_request *req)
207{
208    struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
209    struct shash_desc *desc = ahash_request_ctx(req);
210
211    desc->tfm = *ctx;
212    desc->flags = req->base.flags;
213
214    return crypto_shash_init(desc);
215}
216
217int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
218{
219    struct crypto_hash_walk walk;
220    int nbytes;
221
222    for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
223         nbytes = crypto_hash_walk_done(&walk, nbytes))
224        nbytes = crypto_shash_update(desc, walk.data, nbytes);
225
226    return nbytes;
227}
228EXPORT_SYMBOL_GPL(shash_ahash_update);
229
230static int shash_async_update(struct ahash_request *req)
231{
232    return shash_ahash_update(req, ahash_request_ctx(req));
233}
234
235static int shash_async_final(struct ahash_request *req)
236{
237    return crypto_shash_final(ahash_request_ctx(req), req->result);
238}
239
240int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
241{
242    struct crypto_hash_walk walk;
243    int nbytes;
244
245    nbytes = crypto_hash_walk_first(req, &walk);
246    if (!nbytes)
247        return crypto_shash_final(desc, req->result);
248
249    do {
250        nbytes = crypto_hash_walk_last(&walk) ?
251             crypto_shash_finup(desc, walk.data, nbytes,
252                        req->result) :
253             crypto_shash_update(desc, walk.data, nbytes);
254        nbytes = crypto_hash_walk_done(&walk, nbytes);
255    } while (nbytes > 0);
256
257    return nbytes;
258}
259EXPORT_SYMBOL_GPL(shash_ahash_finup);
260
261static int shash_async_finup(struct ahash_request *req)
262{
263    struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
264    struct shash_desc *desc = ahash_request_ctx(req);
265
266    desc->tfm = *ctx;
267    desc->flags = req->base.flags;
268
269    return shash_ahash_finup(req, desc);
270}
271
272int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
273{
274    struct scatterlist *sg = req->src;
275    unsigned int offset = sg->offset;
276    unsigned int nbytes = req->nbytes;
277    int err;
278
279    if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
280        void *data;
281
282        data = crypto_kmap(sg_page(sg), 0);
283        err = crypto_shash_digest(desc, data + offset, nbytes,
284                      req->result);
285        crypto_kunmap(data, 0);
286        crypto_yield(desc->flags);
287    } else
288        err = crypto_shash_init(desc) ?:
289              shash_ahash_finup(req, desc);
290
291    return err;
292}
293EXPORT_SYMBOL_GPL(shash_ahash_digest);
294
295static int shash_async_digest(struct ahash_request *req)
296{
297    struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
298    struct shash_desc *desc = ahash_request_ctx(req);
299
300    desc->tfm = *ctx;
301    desc->flags = req->base.flags;
302
303    return shash_ahash_digest(req, desc);
304}
305
306static int shash_async_export(struct ahash_request *req, void *out)
307{
308    return crypto_shash_export(ahash_request_ctx(req), out);
309}
310
311static int shash_async_import(struct ahash_request *req, const void *in)
312{
313    return crypto_shash_import(ahash_request_ctx(req), in);
314}
315
316static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
317{
318    struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
319
320    crypto_free_shash(*ctx);
321}
322
323int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
324{
325    struct crypto_alg *calg = tfm->__crt_alg;
326    struct shash_alg *alg = __crypto_shash_alg(calg);
327    struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
328    struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
329    struct crypto_shash *shash;
330
331    if (!crypto_mod_get(calg))
332        return -EAGAIN;
333
334    shash = crypto_create_tfm(calg, &crypto_shash_type);
335    if (IS_ERR(shash)) {
336        crypto_mod_put(calg);
337        return PTR_ERR(shash);
338    }
339
340    *ctx = shash;
341    tfm->exit = crypto_exit_shash_ops_async;
342
343    crt->init = shash_async_init;
344    crt->update = shash_async_update;
345    crt->final = shash_async_final;
346    crt->finup = shash_async_finup;
347    crt->digest = shash_async_digest;
348
349    if (alg->setkey)
350        crt->setkey = shash_async_setkey;
351    if (alg->export)
352        crt->export = shash_async_export;
353    if (alg->import)
354        crt->import = shash_async_import;
355
356    crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
357
358    return 0;
359}
360
361static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
362                   unsigned int keylen)
363{
364    struct shash_desc **descp = crypto_hash_ctx(tfm);
365    struct shash_desc *desc = *descp;
366
367    return crypto_shash_setkey(desc->tfm, key, keylen);
368}
369
370static int shash_compat_init(struct hash_desc *hdesc)
371{
372    struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
373    struct shash_desc *desc = *descp;
374
375    desc->flags = hdesc->flags;
376
377    return crypto_shash_init(desc);
378}
379
380static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
381                   unsigned int len)
382{
383    struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
384    struct shash_desc *desc = *descp;
385    struct crypto_hash_walk walk;
386    int nbytes;
387
388    for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
389         nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
390        nbytes = crypto_shash_update(desc, walk.data, nbytes);
391
392    return nbytes;
393}
394
395static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
396{
397    struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
398
399    return crypto_shash_final(*descp, out);
400}
401
402static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
403                   unsigned int nbytes, u8 *out)
404{
405    unsigned int offset = sg->offset;
406    int err;
407
408    if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
409        struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
410        struct shash_desc *desc = *descp;
411        void *data;
412
413        desc->flags = hdesc->flags;
414
415        data = crypto_kmap(sg_page(sg), 0);
416        err = crypto_shash_digest(desc, data + offset, nbytes, out);
417        crypto_kunmap(data, 0);
418        crypto_yield(desc->flags);
419        goto out;
420    }
421
422    err = shash_compat_init(hdesc);
423    if (err)
424        goto out;
425
426    err = shash_compat_update(hdesc, sg, nbytes);
427    if (err)
428        goto out;
429
430    err = shash_compat_final(hdesc, out);
431
432out:
433    return err;
434}
435
436static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
437{
438    struct shash_desc **descp = crypto_tfm_ctx(tfm);
439    struct shash_desc *desc = *descp;
440
441    crypto_free_shash(desc->tfm);
442    kzfree(desc);
443}
444
445static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
446{
447    struct hash_tfm *crt = &tfm->crt_hash;
448    struct crypto_alg *calg = tfm->__crt_alg;
449    struct shash_alg *alg = __crypto_shash_alg(calg);
450    struct shash_desc **descp = crypto_tfm_ctx(tfm);
451    struct crypto_shash *shash;
452    struct shash_desc *desc;
453
454    if (!crypto_mod_get(calg))
455        return -EAGAIN;
456
457    shash = crypto_create_tfm(calg, &crypto_shash_type);
458    if (IS_ERR(shash)) {
459        crypto_mod_put(calg);
460        return PTR_ERR(shash);
461    }
462
463    desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
464               GFP_KERNEL);
465    if (!desc) {
466        crypto_free_shash(shash);
467        return -ENOMEM;
468    }
469
470    *descp = desc;
471    desc->tfm = shash;
472    tfm->exit = crypto_exit_shash_ops_compat;
473
474    crt->init = shash_compat_init;
475    crt->update = shash_compat_update;
476    crt->final = shash_compat_final;
477    crt->digest = shash_compat_digest;
478    crt->setkey = shash_compat_setkey;
479
480    crt->digestsize = alg->digestsize;
481
482    return 0;
483}
484
485static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
486{
487    switch (mask & CRYPTO_ALG_TYPE_MASK) {
488    case CRYPTO_ALG_TYPE_HASH_MASK:
489        return crypto_init_shash_ops_compat(tfm);
490    }
491
492    return -EINVAL;
493}
494
495static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
496                     u32 mask)
497{
498    switch (mask & CRYPTO_ALG_TYPE_MASK) {
499    case CRYPTO_ALG_TYPE_HASH_MASK:
500        return sizeof(struct shash_desc *);
501    }
502
503    return 0;
504}
505
506static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
507{
508    struct crypto_shash *hash = __crypto_shash_cast(tfm);
509
510    hash->descsize = crypto_shash_alg(hash)->descsize;
511    return 0;
512}
513
514static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
515{
516    return alg->cra_ctxsize;
517}
518
519static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
520    __attribute__ ((unused));
521static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
522{
523    struct shash_alg *salg = __crypto_shash_alg(alg);
524
525    seq_printf(m, "type : shash\n");
526    seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
527    seq_printf(m, "digestsize : %u\n", salg->digestsize);
528}
529
530static const struct crypto_type crypto_shash_type = {
531    .ctxsize = crypto_shash_ctxsize,
532    .extsize = crypto_shash_extsize,
533    .init = crypto_init_shash_ops,
534    .init_tfm = crypto_shash_init_tfm,
535#ifdef CONFIG_PROC_FS
536    .show = crypto_shash_show,
537#endif
538    .maskclear = ~CRYPTO_ALG_TYPE_MASK,
539    .maskset = CRYPTO_ALG_TYPE_MASK,
540    .type = CRYPTO_ALG_TYPE_SHASH,
541    .tfmsize = offsetof(struct crypto_shash, base),
542};
543
544struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
545                    u32 mask)
546{
547    return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
548}
549EXPORT_SYMBOL_GPL(crypto_alloc_shash);
550
551static int shash_prepare_alg(struct shash_alg *alg)
552{
553    struct crypto_alg *base = &alg->base;
554
555    if (alg->digestsize > PAGE_SIZE / 8 ||
556        alg->descsize > PAGE_SIZE / 8 ||
557        alg->statesize > PAGE_SIZE / 8)
558        return -EINVAL;
559
560    base->cra_type = &crypto_shash_type;
561    base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
562    base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
563
564    if (!alg->finup)
565        alg->finup = shash_finup_unaligned;
566    if (!alg->digest)
567        alg->digest = shash_digest_unaligned;
568    if (!alg->export) {
569        alg->export = shash_default_export;
570        alg->import = shash_default_import;
571        alg->statesize = alg->descsize;
572    }
573    if (!alg->setkey)
574        alg->setkey = shash_no_setkey;
575
576    return 0;
577}
578
579int crypto_register_shash(struct shash_alg *alg)
580{
581    struct crypto_alg *base = &alg->base;
582    int err;
583
584    err = shash_prepare_alg(alg);
585    if (err)
586        return err;
587
588    return crypto_register_alg(base);
589}
590EXPORT_SYMBOL_GPL(crypto_register_shash);
591
592int crypto_unregister_shash(struct shash_alg *alg)
593{
594    return crypto_unregister_alg(&alg->base);
595}
596EXPORT_SYMBOL_GPL(crypto_unregister_shash);
597
598int shash_register_instance(struct crypto_template *tmpl,
599                struct shash_instance *inst)
600{
601    int err;
602
603    err = shash_prepare_alg(&inst->alg);
604    if (err)
605        return err;
606
607    return crypto_register_instance(tmpl, shash_crypto_instance(inst));
608}
609EXPORT_SYMBOL_GPL(shash_register_instance);
610
611void shash_free_instance(struct crypto_instance *inst)
612{
613    crypto_drop_spawn(crypto_instance_ctx(inst));
614    kfree(shash_instance(inst));
615}
616EXPORT_SYMBOL_GPL(shash_free_instance);
617
618int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
619                struct shash_alg *alg,
620                struct crypto_instance *inst)
621{
622    return crypto_init_spawn2(&spawn->base, &alg->base, inst,
623                  &crypto_shash_type);
624}
625EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
626
627struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
628{
629    struct crypto_alg *alg;
630
631    alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
632    return IS_ERR(alg) ? ERR_CAST(alg) :
633           container_of(alg, struct shash_alg, base);
634}
635EXPORT_SYMBOL_GPL(shash_attr_alg);
636
637MODULE_LICENSE("GPL");
638MODULE_DESCRIPTION("Synchronous cryptographic hash type");
639

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jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master

Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9



interactive