blob: 834d9d24cdae9cbfa90b1d566a59b1cc49077b65 [file] [log] [blame]
Herbert Xu7b5a080b2008-08-31 15:47:27 +10001/*
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
Herbert Xu3b2f6df2008-08-31 18:52:18 +100013#include <crypto/scatterwalk.h>
Herbert Xu7b5a080b2008-08-31 15:47:27 +100014#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
Herbert Xu3b2f6df2008-08-31 18:52:18 +100021#include "internal.h"
22
Herbert Xu3f683d62009-02-18 16:56:59 +080023static const struct crypto_type crypto_shash_type;
24
Herbert Xu57cfe442009-07-11 22:17:39 +080025static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
26 unsigned int keylen)
27{
28 return -ENOSYS;
29}
30
Herbert Xu7b5a080b2008-08-31 15:47:27 +100031static 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);
Herbert Xu8c32c512009-07-14 21:35:36 +080048 kzfree(buffer);
Herbert Xu7b5a080b2008-08-31 15:47:27 +100049 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);
Herbert Xu0e2d3a12009-07-14 21:43:56 +080079 u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
Herbert Xu7b5a080b2008-08-31 15:47:27 +100080 __attribute__ ((aligned));
Herbert Xu0e2d3a12009-07-14 21:43:56 +080081 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
Herbert Xu8c32c512009-07-14 21:35:36 +080082 int err;
Herbert Xu7b5a080b2008-08-31 15:47:27 +100083
Yehuda Sadehf4f68992009-03-27 13:03:51 +080084 if (unaligned_len > len)
85 unaligned_len = len;
86
Herbert Xu7b5a080b2008-08-31 15:47:27 +100087 memcpy(buf, data, unaligned_len);
Herbert Xu8c32c512009-07-14 21:35:36 +080088 err = shash->update(desc, buf, unaligned_len);
89 memset(buf, 0, unaligned_len);
Herbert Xu7b5a080b2008-08-31 15:47:27 +100090
Herbert Xu8c32c512009-07-14 21:35:36 +080091 return err ?:
Herbert Xu7b5a080b2008-08-31 15:47:27 +100092 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);
Herbert Xu0e2d3a12009-07-14 21:43:56 +0800115 u8 ubuf[shash_align_buffer_size(ds, alignmask)]
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000116 __attribute__ ((aligned));
Herbert Xu0e2d3a12009-07-14 21:43:56 +0800117 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000118 int err;
119
120 err = shash->final(desc, buf);
Herbert Xu8c32c512009-07-14 21:35:36 +0800121 if (err)
122 goto out;
123
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000124 memcpy(out, buf, ds);
Herbert Xu8c32c512009-07-14 21:35:36 +0800125
126out:
127 memset(buf, 0, ds);
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000128 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
Herbert Xu8267ada2009-07-09 20:36:44 +0800158 if (((unsigned long)data | (unsigned long)out) & alignmask)
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000159 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) ?:
Herbert Xuf88ad8d2009-07-08 23:32:08 +0800169 crypto_shash_finup(desc, data, len, out);
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000170}
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
Herbert Xu8267ada2009-07-09 20:36:44 +0800179 if (((unsigned long)data | (unsigned long)out) & alignmask)
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000180 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
Herbert Xu99d27e12009-07-09 20:30:57 +0800186static int shash_no_export(struct shash_desc *desc, void *out)
Herbert Xudec8b782008-11-02 21:38:11 +0800187{
Herbert Xu99d27e12009-07-09 20:30:57 +0800188 return -ENOSYS;
Herbert Xudec8b782008-11-02 21:38:11 +0800189}
Herbert Xu99d27e12009-07-09 20:30:57 +0800190
191static int shash_no_import(struct shash_desc *desc, const void *in)
192{
193 return -ENOSYS;
194}
Herbert Xudec8b782008-11-02 21:38:11 +0800195
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000196static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
197 unsigned int keylen)
198{
199 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
200
201 return crypto_shash_setkey(*ctx, key, keylen);
202}
203
204static int shash_async_init(struct ahash_request *req)
205{
206 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
207 struct shash_desc *desc = ahash_request_ctx(req);
208
209 desc->tfm = *ctx;
210 desc->flags = req->base.flags;
211
212 return crypto_shash_init(desc);
213}
214
Herbert Xu7eddf952009-07-12 21:25:20 +0800215int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000216{
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000217 struct crypto_hash_walk walk;
218 int nbytes;
219
220 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
221 nbytes = crypto_hash_walk_done(&walk, nbytes))
222 nbytes = crypto_shash_update(desc, walk.data, nbytes);
223
224 return nbytes;
225}
Herbert Xu7eddf952009-07-12 21:25:20 +0800226EXPORT_SYMBOL_GPL(shash_ahash_update);
227
228static int shash_async_update(struct ahash_request *req)
229{
230 return shash_ahash_update(req, ahash_request_ctx(req));
231}
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000232
233static int shash_async_final(struct ahash_request *req)
234{
235 return crypto_shash_final(ahash_request_ctx(req), req->result);
236}
237
Herbert Xu66f6ce52009-07-15 12:40:40 +0800238int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
239{
240 struct crypto_hash_walk walk;
241 int nbytes;
242
243 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
244 nbytes = crypto_hash_walk_done(&walk, nbytes))
245 nbytes = crypto_hash_walk_last(&walk) ?
246 crypto_shash_finup(desc, walk.data, nbytes,
247 req->result) :
248 crypto_shash_update(desc, walk.data, nbytes);
249
250 return nbytes;
251}
252EXPORT_SYMBOL_GPL(shash_ahash_finup);
253
254static int shash_async_finup(struct ahash_request *req)
255{
256 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
257 struct shash_desc *desc = ahash_request_ctx(req);
258
259 desc->tfm = *ctx;
260 desc->flags = req->base.flags;
261
262 return shash_ahash_finup(req, desc);
263}
264
Herbert Xu7eddf952009-07-12 21:25:20 +0800265int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000266{
267 struct scatterlist *sg = req->src;
268 unsigned int offset = sg->offset;
269 unsigned int nbytes = req->nbytes;
270 int err;
271
272 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000273 void *data;
274
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000275 data = crypto_kmap(sg_page(sg), 0);
276 err = crypto_shash_digest(desc, data + offset, nbytes,
277 req->result);
278 crypto_kunmap(data, 0);
279 crypto_yield(desc->flags);
Herbert Xu7eddf952009-07-12 21:25:20 +0800280 } else
281 err = crypto_shash_init(desc) ?:
Herbert Xu66f6ce52009-07-15 12:40:40 +0800282 shash_ahash_finup(req, desc);
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000283
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000284 return err;
285}
Herbert Xu7eddf952009-07-12 21:25:20 +0800286EXPORT_SYMBOL_GPL(shash_ahash_digest);
287
288static int shash_async_digest(struct ahash_request *req)
289{
290 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
291 struct shash_desc *desc = ahash_request_ctx(req);
292
293 desc->tfm = *ctx;
294 desc->flags = req->base.flags;
295
296 return shash_ahash_digest(req, desc);
297}
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000298
Herbert Xu66f6ce52009-07-15 12:40:40 +0800299static int shash_async_export(struct ahash_request *req, void *out)
300{
301 return crypto_shash_export(ahash_request_ctx(req), out);
302}
303
304static int shash_async_import(struct ahash_request *req, const void *in)
305{
306 return crypto_shash_import(ahash_request_ctx(req), in);
307}
308
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000309static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
310{
311 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
312
313 crypto_free_shash(*ctx);
314}
315
Herbert Xu88056ec2009-07-14 12:28:26 +0800316int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000317{
318 struct crypto_alg *calg = tfm->__crt_alg;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800319 struct shash_alg *alg = __crypto_shash_alg(calg);
Herbert Xu88056ec2009-07-14 12:28:26 +0800320 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000321 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
322 struct crypto_shash *shash;
323
324 if (!crypto_mod_get(calg))
325 return -EAGAIN;
326
Herbert Xu3f683d62009-02-18 16:56:59 +0800327 shash = crypto_create_tfm(calg, &crypto_shash_type);
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000328 if (IS_ERR(shash)) {
329 crypto_mod_put(calg);
330 return PTR_ERR(shash);
331 }
332
333 *ctx = shash;
334 tfm->exit = crypto_exit_shash_ops_async;
335
336 crt->init = shash_async_init;
337 crt->update = shash_async_update;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800338 crt->final = shash_async_final;
339 crt->finup = shash_async_finup;
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000340 crt->digest = shash_async_digest;
Herbert Xu66f6ce52009-07-15 12:40:40 +0800341
342 if (alg->setkey)
343 crt->setkey = shash_async_setkey;
344 if (alg->export)
345 crt->export = shash_async_export;
346 if (alg->setkey)
347 crt->import = shash_async_import;
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000348
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000349 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
350
351 return 0;
352}
353
Herbert Xu5f7082e2008-08-31 22:21:09 +1000354static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
355 unsigned int keylen)
356{
Herbert Xu113adef2009-07-14 12:50:12 +0800357 struct shash_desc **descp = crypto_hash_ctx(tfm);
358 struct shash_desc *desc = *descp;
Herbert Xu5f7082e2008-08-31 22:21:09 +1000359
360 return crypto_shash_setkey(desc->tfm, key, keylen);
361}
362
363static int shash_compat_init(struct hash_desc *hdesc)
364{
Herbert Xu113adef2009-07-14 12:50:12 +0800365 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
366 struct shash_desc *desc = *descp;
Herbert Xu5f7082e2008-08-31 22:21:09 +1000367
368 desc->flags = hdesc->flags;
369
370 return crypto_shash_init(desc);
371}
372
373static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
374 unsigned int len)
375{
Herbert Xu113adef2009-07-14 12:50:12 +0800376 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
377 struct shash_desc *desc = *descp;
Herbert Xu5f7082e2008-08-31 22:21:09 +1000378 struct crypto_hash_walk walk;
379 int nbytes;
380
381 for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
382 nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
383 nbytes = crypto_shash_update(desc, walk.data, nbytes);
384
385 return nbytes;
386}
387
388static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
389{
Herbert Xu113adef2009-07-14 12:50:12 +0800390 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
391
392 return crypto_shash_final(*descp, out);
Herbert Xu5f7082e2008-08-31 22:21:09 +1000393}
394
395static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
396 unsigned int nbytes, u8 *out)
397{
398 unsigned int offset = sg->offset;
399 int err;
400
401 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
Herbert Xu113adef2009-07-14 12:50:12 +0800402 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
403 struct shash_desc *desc = *descp;
Herbert Xu5f7082e2008-08-31 22:21:09 +1000404 void *data;
405
406 desc->flags = hdesc->flags;
407
408 data = crypto_kmap(sg_page(sg), 0);
409 err = crypto_shash_digest(desc, data + offset, nbytes, out);
410 crypto_kunmap(data, 0);
411 crypto_yield(desc->flags);
412 goto out;
413 }
414
415 err = shash_compat_init(hdesc);
416 if (err)
417 goto out;
418
419 err = shash_compat_update(hdesc, sg, nbytes);
420 if (err)
421 goto out;
422
423 err = shash_compat_final(hdesc, out);
424
425out:
426 return err;
427}
428
429static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
430{
Herbert Xu113adef2009-07-14 12:50:12 +0800431 struct shash_desc **descp = crypto_tfm_ctx(tfm);
432 struct shash_desc *desc = *descp;
Herbert Xu5f7082e2008-08-31 22:21:09 +1000433
434 crypto_free_shash(desc->tfm);
Herbert Xu113adef2009-07-14 12:50:12 +0800435 kzfree(desc);
Herbert Xu5f7082e2008-08-31 22:21:09 +1000436}
437
438static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
439{
440 struct hash_tfm *crt = &tfm->crt_hash;
441 struct crypto_alg *calg = tfm->__crt_alg;
442 struct shash_alg *alg = __crypto_shash_alg(calg);
Herbert Xu113adef2009-07-14 12:50:12 +0800443 struct shash_desc **descp = crypto_tfm_ctx(tfm);
Herbert Xu5f7082e2008-08-31 22:21:09 +1000444 struct crypto_shash *shash;
Herbert Xu113adef2009-07-14 12:50:12 +0800445 struct shash_desc *desc;
Herbert Xu5f7082e2008-08-31 22:21:09 +1000446
Adrian-Ken Rueegsegger4abfd732009-02-05 16:19:31 +1100447 if (!crypto_mod_get(calg))
448 return -EAGAIN;
449
Herbert Xu3f683d62009-02-18 16:56:59 +0800450 shash = crypto_create_tfm(calg, &crypto_shash_type);
Adrian-Ken Rueegsegger4abfd732009-02-05 16:19:31 +1100451 if (IS_ERR(shash)) {
452 crypto_mod_put(calg);
Herbert Xu5f7082e2008-08-31 22:21:09 +1000453 return PTR_ERR(shash);
Adrian-Ken Rueegsegger4abfd732009-02-05 16:19:31 +1100454 }
Herbert Xu5f7082e2008-08-31 22:21:09 +1000455
Herbert Xu113adef2009-07-14 12:50:12 +0800456 desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
457 GFP_KERNEL);
458 if (!desc) {
459 crypto_free_shash(shash);
460 return -ENOMEM;
461 }
462
463 *descp = desc;
Herbert Xu5f7082e2008-08-31 22:21:09 +1000464 desc->tfm = shash;
465 tfm->exit = crypto_exit_shash_ops_compat;
466
467 crt->init = shash_compat_init;
468 crt->update = shash_compat_update;
469 crt->final = shash_compat_final;
470 crt->digest = shash_compat_digest;
471 crt->setkey = shash_compat_setkey;
472
473 crt->digestsize = alg->digestsize;
474
475 return 0;
476}
477
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000478static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
479{
480 switch (mask & CRYPTO_ALG_TYPE_MASK) {
Herbert Xu5f7082e2008-08-31 22:21:09 +1000481 case CRYPTO_ALG_TYPE_HASH_MASK:
482 return crypto_init_shash_ops_compat(tfm);
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000483 }
484
485 return -EINVAL;
486}
487
488static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
489 u32 mask)
490{
491 switch (mask & CRYPTO_ALG_TYPE_MASK) {
Herbert Xu5f7082e2008-08-31 22:21:09 +1000492 case CRYPTO_ALG_TYPE_HASH_MASK:
Herbert Xu113adef2009-07-14 12:50:12 +0800493 return sizeof(struct shash_desc *);
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000494 }
495
496 return 0;
497}
498
Herbert Xu2ca33da2009-07-13 20:46:25 +0800499static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000500{
Herbert Xu113adef2009-07-14 12:50:12 +0800501 struct crypto_shash *hash = __crypto_shash_cast(tfm);
502
503 hash->descsize = crypto_shash_alg(hash)->descsize;
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000504 return 0;
505}
506
Herbert Xu2ca33da2009-07-13 20:46:25 +0800507static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000508{
509 return alg->cra_ctxsize;
510}
511
512static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
513 __attribute__ ((unused));
514static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
515{
516 struct shash_alg *salg = __crypto_shash_alg(alg);
517
518 seq_printf(m, "type : shash\n");
519 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
520 seq_printf(m, "digestsize : %u\n", salg->digestsize);
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000521}
522
523static const struct crypto_type crypto_shash_type = {
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000524 .ctxsize = crypto_shash_ctxsize,
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000525 .extsize = crypto_shash_extsize,
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000526 .init = crypto_init_shash_ops,
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000527 .init_tfm = crypto_shash_init_tfm,
528#ifdef CONFIG_PROC_FS
529 .show = crypto_shash_show,
530#endif
531 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
532 .maskset = CRYPTO_ALG_TYPE_MASK,
533 .type = CRYPTO_ALG_TYPE_SHASH,
534 .tfmsize = offsetof(struct crypto_shash, base),
535};
536
537struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
538 u32 mask)
539{
Herbert Xu3f683d62009-02-18 16:56:59 +0800540 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000541}
542EXPORT_SYMBOL_GPL(crypto_alloc_shash);
543
Herbert Xu619a6eb2009-07-08 18:46:23 +0800544static int shash_prepare_alg(struct shash_alg *alg)
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000545{
546 struct crypto_alg *base = &alg->base;
547
548 if (alg->digestsize > PAGE_SIZE / 8 ||
Herbert Xu99d27e12009-07-09 20:30:57 +0800549 alg->descsize > PAGE_SIZE / 8 ||
550 alg->statesize > PAGE_SIZE / 8)
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000551 return -EINVAL;
552
553 base->cra_type = &crypto_shash_type;
554 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
555 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
Herbert Xu99d27e12009-07-09 20:30:57 +0800556
Herbert Xu8267ada2009-07-09 20:36:44 +0800557 if (!alg->finup)
558 alg->finup = shash_finup_unaligned;
559 if (!alg->digest)
560 alg->digest = shash_digest_unaligned;
Herbert Xu99d27e12009-07-09 20:30:57 +0800561 if (!alg->import)
562 alg->import = shash_no_import;
563 if (!alg->export)
564 alg->export = shash_no_export;
Herbert Xu57cfe442009-07-11 22:17:39 +0800565 if (!alg->setkey)
566 alg->setkey = shash_no_setkey;
Herbert Xu99d27e12009-07-09 20:30:57 +0800567
Herbert Xu619a6eb2009-07-08 18:46:23 +0800568 return 0;
569}
570
571int crypto_register_shash(struct shash_alg *alg)
572{
573 struct crypto_alg *base = &alg->base;
574 int err;
575
576 err = shash_prepare_alg(alg);
577 if (err)
578 return err;
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000579
580 return crypto_register_alg(base);
581}
582EXPORT_SYMBOL_GPL(crypto_register_shash);
583
584int crypto_unregister_shash(struct shash_alg *alg)
585{
586 return crypto_unregister_alg(&alg->base);
587}
588EXPORT_SYMBOL_GPL(crypto_unregister_shash);
589
Herbert Xu619a6eb2009-07-08 18:46:23 +0800590int shash_register_instance(struct crypto_template *tmpl,
591 struct shash_instance *inst)
592{
593 int err;
594
595 err = shash_prepare_alg(&inst->alg);
596 if (err)
597 return err;
598
599 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
600}
601EXPORT_SYMBOL_GPL(shash_register_instance);
602
Herbert Xu2e4fddd2009-07-07 15:17:12 +0800603void shash_free_instance(struct crypto_instance *inst)
604{
605 crypto_drop_spawn(crypto_instance_ctx(inst));
606 kfree(shash_instance(inst));
607}
608EXPORT_SYMBOL_GPL(shash_free_instance);
609
Herbert Xu94296992009-07-08 17:21:37 +0800610int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
611 struct shash_alg *alg,
612 struct crypto_instance *inst)
613{
614 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
615 &crypto_shash_type);
616}
617EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
618
Herbert Xu7d6f5642009-07-08 17:56:28 +0800619struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
620{
621 struct crypto_alg *alg;
622
623 alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
624 return IS_ERR(alg) ? ERR_CAST(alg) :
625 container_of(alg, struct shash_alg, base);
626}
627EXPORT_SYMBOL_GPL(shash_attr_alg);
628
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000629MODULE_LICENSE("GPL");
630MODULE_DESCRIPTION("Synchronous cryptographic hash type");