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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
3b2f6df0 13#include <crypto/scatterwalk.h>
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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>
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20#include <linux/cryptouser.h>
21#include <net/netlink.h>
7b5a080b 22
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23#include "internal.h"
24
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25static const struct crypto_type crypto_shash_type;
26
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27static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
28 unsigned int keylen)
29{
30 return -ENOSYS;
31}
32
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33static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
34 unsigned int keylen)
35{
36 struct shash_alg *shash = crypto_shash_alg(tfm);
37 unsigned long alignmask = crypto_shash_alignmask(tfm);
38 unsigned long absize;
39 u8 *buffer, *alignbuffer;
40 int err;
41
18eb8ea6 42 absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
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43 buffer = kmalloc(absize, GFP_KERNEL);
44 if (!buffer)
45 return -ENOMEM;
46
47 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
48 memcpy(alignbuffer, key, keylen);
49 err = shash->setkey(tfm, alignbuffer, keylen);
8c32c516 50 kzfree(buffer);
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51 return err;
52}
53
54int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
55 unsigned int keylen)
56{
57 struct shash_alg *shash = crypto_shash_alg(tfm);
58 unsigned long alignmask = crypto_shash_alignmask(tfm);
59
60 if ((unsigned long)key & alignmask)
61 return shash_setkey_unaligned(tfm, key, keylen);
62
63 return shash->setkey(tfm, key, keylen);
64}
65EXPORT_SYMBOL_GPL(crypto_shash_setkey);
66
67static inline unsigned int shash_align_buffer_size(unsigned len,
68 unsigned long mask)
69{
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70 typedef u8 __attribute__ ((aligned)) u8_aligned;
71 return len + (mask & ~(__alignof__(u8_aligned) - 1));
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72}
73
74static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
75 unsigned int len)
76{
77 struct crypto_shash *tfm = desc->tfm;
78 struct shash_alg *shash = crypto_shash_alg(tfm);
79 unsigned long alignmask = crypto_shash_alignmask(tfm);
80 unsigned int unaligned_len = alignmask + 1 -
81 ((unsigned long)data & alignmask);
0e2d3a12 82 u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
7b5a080b 83 __attribute__ ((aligned));
0e2d3a12 84 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
8c32c516 85 int err;
7b5a080b 86
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87 if (unaligned_len > len)
88 unaligned_len = len;
89
7b5a080b 90 memcpy(buf, data, unaligned_len);
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91 err = shash->update(desc, buf, unaligned_len);
92 memset(buf, 0, unaligned_len);
7b5a080b 93
8c32c516 94 return err ?:
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95 shash->update(desc, data + unaligned_len, len - unaligned_len);
96}
97
98int crypto_shash_update(struct shash_desc *desc, const u8 *data,
99 unsigned int len)
100{
101 struct crypto_shash *tfm = desc->tfm;
102 struct shash_alg *shash = crypto_shash_alg(tfm);
103 unsigned long alignmask = crypto_shash_alignmask(tfm);
104
105 if ((unsigned long)data & alignmask)
106 return shash_update_unaligned(desc, data, len);
107
108 return shash->update(desc, data, len);
109}
110EXPORT_SYMBOL_GPL(crypto_shash_update);
111
112static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
113{
114 struct crypto_shash *tfm = desc->tfm;
115 unsigned long alignmask = crypto_shash_alignmask(tfm);
116 struct shash_alg *shash = crypto_shash_alg(tfm);
117 unsigned int ds = crypto_shash_digestsize(tfm);
0e2d3a12 118 u8 ubuf[shash_align_buffer_size(ds, alignmask)]
7b5a080b 119 __attribute__ ((aligned));
0e2d3a12 120 u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
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121 int err;
122
123 err = shash->final(desc, buf);
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124 if (err)
125 goto out;
126
7b5a080b 127 memcpy(out, buf, ds);
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128
129out:
130 memset(buf, 0, ds);
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131 return err;
132}
133
134int crypto_shash_final(struct shash_desc *desc, u8 *out)
135{
136 struct crypto_shash *tfm = desc->tfm;
137 struct shash_alg *shash = crypto_shash_alg(tfm);
138 unsigned long alignmask = crypto_shash_alignmask(tfm);
139
140 if ((unsigned long)out & alignmask)
141 return shash_final_unaligned(desc, out);
142
143 return shash->final(desc, out);
144}
145EXPORT_SYMBOL_GPL(crypto_shash_final);
146
147static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
148 unsigned int len, u8 *out)
149{
150 return crypto_shash_update(desc, data, len) ?:
151 crypto_shash_final(desc, out);
152}
153
154int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
155 unsigned int len, u8 *out)
156{
157 struct crypto_shash *tfm = desc->tfm;
158 struct shash_alg *shash = crypto_shash_alg(tfm);
159 unsigned long alignmask = crypto_shash_alignmask(tfm);
160
8267adab 161 if (((unsigned long)data | (unsigned long)out) & alignmask)
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162 return shash_finup_unaligned(desc, data, len, out);
163
164 return shash->finup(desc, data, len, out);
165}
166EXPORT_SYMBOL_GPL(crypto_shash_finup);
167
168static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
169 unsigned int len, u8 *out)
170{
171 return crypto_shash_init(desc) ?:
f88ad8de 172 crypto_shash_finup(desc, data, len, out);
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173}
174
175int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
176 unsigned int len, u8 *out)
177{
178 struct crypto_shash *tfm = desc->tfm;
179 struct shash_alg *shash = crypto_shash_alg(tfm);
180 unsigned long alignmask = crypto_shash_alignmask(tfm);
181
8267adab 182 if (((unsigned long)data | (unsigned long)out) & alignmask)
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183 return shash_digest_unaligned(desc, data, len, out);
184
185 return shash->digest(desc, data, len, out);
186}
187EXPORT_SYMBOL_GPL(crypto_shash_digest);
188
f592682f 189static int shash_default_export(struct shash_desc *desc, void *out)
dec8b786 190{
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191 memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
192 return 0;
99d27e1c 193}
dec8b786 194
f592682f 195static int shash_default_import(struct shash_desc *desc, const void *in)
99d27e1c 196{
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197 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
198 return 0;
dec8b786 199}
dec8b786 200
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201static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
202 unsigned int keylen)
203{
204 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
205
206 return crypto_shash_setkey(*ctx, key, keylen);
207}
208
209static int shash_async_init(struct ahash_request *req)
210{
211 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
212 struct shash_desc *desc = ahash_request_ctx(req);
213
214 desc->tfm = *ctx;
215 desc->flags = req->base.flags;
216
217 return crypto_shash_init(desc);
218}
219
7eddf95e 220int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
3b2f6df0 221{
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222 struct crypto_hash_walk walk;
223 int nbytes;
224
225 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
226 nbytes = crypto_hash_walk_done(&walk, nbytes))
227 nbytes = crypto_shash_update(desc, walk.data, nbytes);
228
229 return nbytes;
230}
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231EXPORT_SYMBOL_GPL(shash_ahash_update);
232
233static int shash_async_update(struct ahash_request *req)
234{
235 return shash_ahash_update(req, ahash_request_ctx(req));
236}
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237
238static int shash_async_final(struct ahash_request *req)
239{
240 return crypto_shash_final(ahash_request_ctx(req), req->result);
241}
242
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243int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
244{
245 struct crypto_hash_walk walk;
246 int nbytes;
247
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248 nbytes = crypto_hash_walk_first(req, &walk);
249 if (!nbytes)
250 return crypto_shash_final(desc, req->result);
251
252 do {
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253 nbytes = crypto_hash_walk_last(&walk) ?
254 crypto_shash_finup(desc, walk.data, nbytes,
255 req->result) :
256 crypto_shash_update(desc, walk.data, nbytes);
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257 nbytes = crypto_hash_walk_done(&walk, nbytes);
258 } while (nbytes > 0);
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259
260 return nbytes;
261}
262EXPORT_SYMBOL_GPL(shash_ahash_finup);
263
264static int shash_async_finup(struct ahash_request *req)
265{
266 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
267 struct shash_desc *desc = ahash_request_ctx(req);
268
269 desc->tfm = *ctx;
270 desc->flags = req->base.flags;
271
272 return shash_ahash_finup(req, desc);
273}
274
7eddf95e 275int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
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276{
277 struct scatterlist *sg = req->src;
278 unsigned int offset = sg->offset;
279 unsigned int nbytes = req->nbytes;
280 int err;
281
282 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
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283 void *data;
284
f0dfc0b0 285 data = kmap_atomic(sg_page(sg));
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286 err = crypto_shash_digest(desc, data + offset, nbytes,
287 req->result);
f0dfc0b0 288 kunmap_atomic(data);
3b2f6df0 289 crypto_yield(desc->flags);
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290 } else
291 err = crypto_shash_init(desc) ?:
66f6ce5e 292 shash_ahash_finup(req, desc);
3b2f6df0 293
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294 return err;
295}
296EXPORT_SYMBOL_GPL(shash_ahash_digest);
3b2f6df0 297
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298static int shash_async_digest(struct ahash_request *req)
299{
300 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
301 struct shash_desc *desc = ahash_request_ctx(req);
3b2f6df0 302
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303 desc->tfm = *ctx;
304 desc->flags = req->base.flags;
3b2f6df0 305
7eddf95e 306 return shash_ahash_digest(req, desc);
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307}
308
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309static int shash_async_export(struct ahash_request *req, void *out)
310{
311 return crypto_shash_export(ahash_request_ctx(req), out);
312}
313
314static int shash_async_import(struct ahash_request *req, const void *in)
315{
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316 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
317 struct shash_desc *desc = ahash_request_ctx(req);
318
319 desc->tfm = *ctx;
320 desc->flags = req->base.flags;
321
322 return crypto_shash_import(desc, in);
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323}
324
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325static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
326{
327 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
328
329 crypto_free_shash(*ctx);
330}
331
88056ec3 332int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
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333{
334 struct crypto_alg *calg = tfm->__crt_alg;
66f6ce5e 335 struct shash_alg *alg = __crypto_shash_alg(calg);
88056ec3 336 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
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337 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
338 struct crypto_shash *shash;
339
340 if (!crypto_mod_get(calg))
341 return -EAGAIN;
342
3f683d61 343 shash = crypto_create_tfm(calg, &crypto_shash_type);
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344 if (IS_ERR(shash)) {
345 crypto_mod_put(calg);
346 return PTR_ERR(shash);
347 }
348
349 *ctx = shash;
350 tfm->exit = crypto_exit_shash_ops_async;
351
352 crt->init = shash_async_init;
353 crt->update = shash_async_update;
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354 crt->final = shash_async_final;
355 crt->finup = shash_async_finup;
3b2f6df0 356 crt->digest = shash_async_digest;
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357 crt->setkey = shash_async_setkey;
358
359 crt->has_setkey = alg->setkey != shash_no_setkey;
66f6ce5e 360
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361 if (alg->export)
362 crt->export = shash_async_export;
0044f3ed 363 if (alg->import)
66f6ce5e 364 crt->import = shash_async_import;
3b2f6df0 365
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366 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
367
368 return 0;
369}
370
2ca33da1 371static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
7b5a080b 372{
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373 struct crypto_shash *hash = __crypto_shash_cast(tfm);
374
375 hash->descsize = crypto_shash_alg(hash)->descsize;
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376 return 0;
377}
378
3acc8473 379#ifdef CONFIG_NET
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380static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
381{
382 struct crypto_report_hash rhash;
383 struct shash_alg *salg = __crypto_shash_alg(alg);
384
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385 strncpy(rhash.type, "shash", sizeof(rhash.type));
386
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387 rhash.blocksize = alg->cra_blocksize;
388 rhash.digestsize = salg->digestsize;
389
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390 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
391 sizeof(struct crypto_report_hash), &rhash))
392 goto nla_put_failure;
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393 return 0;
394
395nla_put_failure:
396 return -EMSGSIZE;
397}
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398#else
399static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
400{
401 return -ENOSYS;
402}
403#endif
f4d663ce 404
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405static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
406 __attribute__ ((unused));
407static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
408{
409 struct shash_alg *salg = __crypto_shash_alg(alg);
410
411 seq_printf(m, "type : shash\n");
412 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
413 seq_printf(m, "digestsize : %u\n", salg->digestsize);
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414}
415
416static const struct crypto_type crypto_shash_type = {
ac611680 417 .extsize = crypto_alg_extsize,
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418 .init_tfm = crypto_shash_init_tfm,
419#ifdef CONFIG_PROC_FS
420 .show = crypto_shash_show,
421#endif
f4d663ce 422 .report = crypto_shash_report,
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423 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
424 .maskset = CRYPTO_ALG_TYPE_MASK,
425 .type = CRYPTO_ALG_TYPE_SHASH,
426 .tfmsize = offsetof(struct crypto_shash, base),
427};
428
429struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
430 u32 mask)
431{
3f683d61 432 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
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433}
434EXPORT_SYMBOL_GPL(crypto_alloc_shash);
435
619a6ebd 436static int shash_prepare_alg(struct shash_alg *alg)
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437{
438 struct crypto_alg *base = &alg->base;
439
440 if (alg->digestsize > PAGE_SIZE / 8 ||
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441 alg->descsize > PAGE_SIZE / 8 ||
442 alg->statesize > PAGE_SIZE / 8)
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443 return -EINVAL;
444
445 base->cra_type = &crypto_shash_type;
446 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
447 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
99d27e1c 448
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449 if (!alg->finup)
450 alg->finup = shash_finup_unaligned;
451 if (!alg->digest)
452 alg->digest = shash_digest_unaligned;
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453 if (!alg->export) {
454 alg->export = shash_default_export;
455 alg->import = shash_default_import;
456 alg->statesize = alg->descsize;
457 }
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458 if (!alg->setkey)
459 alg->setkey = shash_no_setkey;
99d27e1c 460
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461 return 0;
462}
463
464int crypto_register_shash(struct shash_alg *alg)
465{
466 struct crypto_alg *base = &alg->base;
467 int err;
468
469 err = shash_prepare_alg(alg);
470 if (err)
471 return err;
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472
473 return crypto_register_alg(base);
474}
475EXPORT_SYMBOL_GPL(crypto_register_shash);
476
477int crypto_unregister_shash(struct shash_alg *alg)
478{
479 return crypto_unregister_alg(&alg->base);
480}
481EXPORT_SYMBOL_GPL(crypto_unregister_shash);
482
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483int crypto_register_shashes(struct shash_alg *algs, int count)
484{
485 int i, ret;
486
487 for (i = 0; i < count; i++) {
488 ret = crypto_register_shash(&algs[i]);
489 if (ret)
490 goto err;
491 }
492
493 return 0;
494
495err:
496 for (--i; i >= 0; --i)
497 crypto_unregister_shash(&algs[i]);
498
499 return ret;
500}
501EXPORT_SYMBOL_GPL(crypto_register_shashes);
502
503int crypto_unregister_shashes(struct shash_alg *algs, int count)
504{
505 int i, ret;
506
507 for (i = count - 1; i >= 0; --i) {
508 ret = crypto_unregister_shash(&algs[i]);
509 if (ret)
510 pr_err("Failed to unregister %s %s: %d\n",
511 algs[i].base.cra_driver_name,
512 algs[i].base.cra_name, ret);
513 }
514
515 return 0;
516}
517EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
518
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519int shash_register_instance(struct crypto_template *tmpl,
520 struct shash_instance *inst)
521{
522 int err;
523
524 err = shash_prepare_alg(&inst->alg);
525 if (err)
526 return err;
527
528 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
529}
530EXPORT_SYMBOL_GPL(shash_register_instance);
531
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532void shash_free_instance(struct crypto_instance *inst)
533{
534 crypto_drop_spawn(crypto_instance_ctx(inst));
535 kfree(shash_instance(inst));
536}
537EXPORT_SYMBOL_GPL(shash_free_instance);
538
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539int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
540 struct shash_alg *alg,
541 struct crypto_instance *inst)
542{
543 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
544 &crypto_shash_type);
545}
546EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
547
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548struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
549{
550 struct crypto_alg *alg;
551
552 alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
553 return IS_ERR(alg) ? ERR_CAST(alg) :
554 container_of(alg, struct shash_alg, base);
555}
556EXPORT_SYMBOL_GPL(shash_attr_alg);
557
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558MODULE_LICENSE("GPL");
559MODULE_DESCRIPTION("Synchronous cryptographic hash type");