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_tfm_ctx_alignment() - 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    struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
314    struct shash_desc *desc = ahash_request_ctx(req);
315
316    desc->tfm = *ctx;
317    desc->flags = req->base.flags;
318
319    return crypto_shash_import(desc, in);
320}
321
322static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
323{
324    struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
325
326    crypto_free_shash(*ctx);
327}
328
329int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
330{
331    struct crypto_alg *calg = tfm->__crt_alg;
332    struct shash_alg *alg = __crypto_shash_alg(calg);
333    struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
334    struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
335    struct crypto_shash *shash;
336
337    if (!crypto_mod_get(calg))
338        return -EAGAIN;
339
340    shash = crypto_create_tfm(calg, &crypto_shash_type);
341    if (IS_ERR(shash)) {
342        crypto_mod_put(calg);
343        return PTR_ERR(shash);
344    }
345
346    *ctx = shash;
347    tfm->exit = crypto_exit_shash_ops_async;
348
349    crt->init = shash_async_init;
350    crt->update = shash_async_update;
351    crt->final = shash_async_final;
352    crt->finup = shash_async_finup;
353    crt->digest = shash_async_digest;
354
355    if (alg->setkey)
356        crt->setkey = shash_async_setkey;
357    if (alg->export)
358        crt->export = shash_async_export;
359    if (alg->import)
360        crt->import = shash_async_import;
361
362    crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
363
364    return 0;
365}
366
367static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
368                   unsigned int keylen)
369{
370    struct shash_desc **descp = crypto_hash_ctx(tfm);
371    struct shash_desc *desc = *descp;
372
373    return crypto_shash_setkey(desc->tfm, key, keylen);
374}
375
376static int shash_compat_init(struct hash_desc *hdesc)
377{
378    struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
379    struct shash_desc *desc = *descp;
380
381    desc->flags = hdesc->flags;
382
383    return crypto_shash_init(desc);
384}
385
386static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
387                   unsigned int len)
388{
389    struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
390    struct shash_desc *desc = *descp;
391    struct crypto_hash_walk walk;
392    int nbytes;
393
394    for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
395         nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
396        nbytes = crypto_shash_update(desc, walk.data, nbytes);
397
398    return nbytes;
399}
400
401static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
402{
403    struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
404
405    return crypto_shash_final(*descp, out);
406}
407
408static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
409                   unsigned int nbytes, u8 *out)
410{
411    unsigned int offset = sg->offset;
412    int err;
413
414    if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
415        struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
416        struct shash_desc *desc = *descp;
417        void *data;
418
419        desc->flags = hdesc->flags;
420
421        data = crypto_kmap(sg_page(sg), 0);
422        err = crypto_shash_digest(desc, data + offset, nbytes, out);
423        crypto_kunmap(data, 0);
424        crypto_yield(desc->flags);
425        goto out;
426    }
427
428    err = shash_compat_init(hdesc);
429    if (err)
430        goto out;
431
432    err = shash_compat_update(hdesc, sg, nbytes);
433    if (err)
434        goto out;
435
436    err = shash_compat_final(hdesc, out);
437
438out:
439    return err;
440}
441
442static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
443{
444    struct shash_desc **descp = crypto_tfm_ctx(tfm);
445    struct shash_desc *desc = *descp;
446
447    crypto_free_shash(desc->tfm);
448    kzfree(desc);
449}
450
451static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
452{
453    struct hash_tfm *crt = &tfm->crt_hash;
454    struct crypto_alg *calg = tfm->__crt_alg;
455    struct shash_alg *alg = __crypto_shash_alg(calg);
456    struct shash_desc **descp = crypto_tfm_ctx(tfm);
457    struct crypto_shash *shash;
458    struct shash_desc *desc;
459
460    if (!crypto_mod_get(calg))
461        return -EAGAIN;
462
463    shash = crypto_create_tfm(calg, &crypto_shash_type);
464    if (IS_ERR(shash)) {
465        crypto_mod_put(calg);
466        return PTR_ERR(shash);
467    }
468
469    desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
470               GFP_KERNEL);
471    if (!desc) {
472        crypto_free_shash(shash);
473        return -ENOMEM;
474    }
475
476    *descp = desc;
477    desc->tfm = shash;
478    tfm->exit = crypto_exit_shash_ops_compat;
479
480    crt->init = shash_compat_init;
481    crt->update = shash_compat_update;
482    crt->final = shash_compat_final;
483    crt->digest = shash_compat_digest;
484    crt->setkey = shash_compat_setkey;
485
486    crt->digestsize = alg->digestsize;
487
488    return 0;
489}
490
491static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
492{
493    switch (mask & CRYPTO_ALG_TYPE_MASK) {
494    case CRYPTO_ALG_TYPE_HASH_MASK:
495        return crypto_init_shash_ops_compat(tfm);
496    }
497
498    return -EINVAL;
499}
500
501static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
502                     u32 mask)
503{
504    switch (mask & CRYPTO_ALG_TYPE_MASK) {
505    case CRYPTO_ALG_TYPE_HASH_MASK:
506        return sizeof(struct shash_desc *);
507    }
508
509    return 0;
510}
511
512static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
513{
514    struct crypto_shash *hash = __crypto_shash_cast(tfm);
515
516    hash->descsize = crypto_shash_alg(hash)->descsize;
517    return 0;
518}
519
520static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
521{
522    return alg->cra_ctxsize;
523}
524
525static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
526    __attribute__ ((unused));
527static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
528{
529    struct shash_alg *salg = __crypto_shash_alg(alg);
530
531    seq_printf(m, "type : shash\n");
532    seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
533    seq_printf(m, "digestsize : %u\n", salg->digestsize);
534}
535
536static const struct crypto_type crypto_shash_type = {
537    .ctxsize = crypto_shash_ctxsize,
538    .extsize = crypto_shash_extsize,
539    .init = crypto_init_shash_ops,
540    .init_tfm = crypto_shash_init_tfm,
541#ifdef CONFIG_PROC_FS
542    .show = crypto_shash_show,
543#endif
544    .maskclear = ~CRYPTO_ALG_TYPE_MASK,
545    .maskset = CRYPTO_ALG_TYPE_MASK,
546    .type = CRYPTO_ALG_TYPE_SHASH,
547    .tfmsize = offsetof(struct crypto_shash, base),
548};
549
550struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
551                    u32 mask)
552{
553    return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
554}
555EXPORT_SYMBOL_GPL(crypto_alloc_shash);
556
557static int shash_prepare_alg(struct shash_alg *alg)
558{
559    struct crypto_alg *base = &alg->base;
560
561    if (alg->digestsize > PAGE_SIZE / 8 ||
562        alg->descsize > PAGE_SIZE / 8 ||
563        alg->statesize > PAGE_SIZE / 8)
564        return -EINVAL;
565
566    base->cra_type = &crypto_shash_type;
567    base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
568    base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
569
570    if (!alg->finup)
571        alg->finup = shash_finup_unaligned;
572    if (!alg->digest)
573        alg->digest = shash_digest_unaligned;
574    if (!alg->export) {
575        alg->export = shash_default_export;
576        alg->import = shash_default_import;
577        alg->statesize = alg->descsize;
578    }
579    if (!alg->setkey)
580        alg->setkey = shash_no_setkey;
581
582    return 0;
583}
584
585int crypto_register_shash(struct shash_alg *alg)
586{
587    struct crypto_alg *base = &alg->base;
588    int err;
589
590    err = shash_prepare_alg(alg);
591    if (err)
592        return err;
593
594    return crypto_register_alg(base);
595}
596EXPORT_SYMBOL_GPL(crypto_register_shash);
597
598int crypto_unregister_shash(struct shash_alg *alg)
599{
600    return crypto_unregister_alg(&alg->base);
601}
602EXPORT_SYMBOL_GPL(crypto_unregister_shash);
603
604int shash_register_instance(struct crypto_template *tmpl,
605                struct shash_instance *inst)
606{
607    int err;
608
609    err = shash_prepare_alg(&inst->alg);
610    if (err)
611        return err;
612
613    return crypto_register_instance(tmpl, shash_crypto_instance(inst));
614}
615EXPORT_SYMBOL_GPL(shash_register_instance);
616
617void shash_free_instance(struct crypto_instance *inst)
618{
619    crypto_drop_spawn(crypto_instance_ctx(inst));
620    kfree(shash_instance(inst));
621}
622EXPORT_SYMBOL_GPL(shash_free_instance);
623
624int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
625                struct shash_alg *alg,
626                struct crypto_instance *inst)
627{
628    return crypto_init_spawn2(&spawn->base, &alg->base, inst,
629                  &crypto_shash_type);
630}
631EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
632
633struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
634{
635    struct crypto_alg *alg;
636
637    alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
638    return IS_ERR(alg) ? ERR_CAST(alg) :
639           container_of(alg, struct shash_alg, base);
640}
641EXPORT_SYMBOL_GPL(shash_attr_alg);
642
643MODULE_LICENSE("GPL");
644MODULE_DESCRIPTION("Synchronous cryptographic hash type");
645

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jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
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
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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
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9



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