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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 Xu7b5a080b2008-08-31 15:47:27 +100025static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
26 unsigned int keylen)
27{
28 struct shash_alg *shash = crypto_shash_alg(tfm);
29 unsigned long alignmask = crypto_shash_alignmask(tfm);
30 unsigned long absize;
31 u8 *buffer, *alignbuffer;
32 int err;
33
34 absize = keylen + (alignmask & ~(CRYPTO_MINALIGN - 1));
35 buffer = kmalloc(absize, GFP_KERNEL);
36 if (!buffer)
37 return -ENOMEM;
38
39 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
40 memcpy(alignbuffer, key, keylen);
41 err = shash->setkey(tfm, alignbuffer, keylen);
42 memset(alignbuffer, 0, keylen);
43 kfree(buffer);
44 return err;
45}
46
47int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
48 unsigned int keylen)
49{
50 struct shash_alg *shash = crypto_shash_alg(tfm);
51 unsigned long alignmask = crypto_shash_alignmask(tfm);
52
Herbert Xu3751f402008-11-08 08:56:57 +080053 if (!shash->setkey)
54 return -ENOSYS;
55
Herbert Xu7b5a080b2008-08-31 15:47:27 +100056 if ((unsigned long)key & alignmask)
57 return shash_setkey_unaligned(tfm, key, keylen);
58
59 return shash->setkey(tfm, key, keylen);
60}
61EXPORT_SYMBOL_GPL(crypto_shash_setkey);
62
63static inline unsigned int shash_align_buffer_size(unsigned len,
64 unsigned long mask)
65{
66 return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
67}
68
69static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
70 unsigned int len)
71{
72 struct crypto_shash *tfm = desc->tfm;
73 struct shash_alg *shash = crypto_shash_alg(tfm);
74 unsigned long alignmask = crypto_shash_alignmask(tfm);
75 unsigned int unaligned_len = alignmask + 1 -
76 ((unsigned long)data & alignmask);
77 u8 buf[shash_align_buffer_size(unaligned_len, alignmask)]
78 __attribute__ ((aligned));
79
80 memcpy(buf, data, unaligned_len);
81
82 return shash->update(desc, buf, unaligned_len) ?:
83 shash->update(desc, data + unaligned_len, len - unaligned_len);
84}
85
86int crypto_shash_update(struct shash_desc *desc, const u8 *data,
87 unsigned int len)
88{
89 struct crypto_shash *tfm = desc->tfm;
90 struct shash_alg *shash = crypto_shash_alg(tfm);
91 unsigned long alignmask = crypto_shash_alignmask(tfm);
92
93 if ((unsigned long)data & alignmask)
94 return shash_update_unaligned(desc, data, len);
95
96 return shash->update(desc, data, len);
97}
98EXPORT_SYMBOL_GPL(crypto_shash_update);
99
100static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
101{
102 struct crypto_shash *tfm = desc->tfm;
103 unsigned long alignmask = crypto_shash_alignmask(tfm);
104 struct shash_alg *shash = crypto_shash_alg(tfm);
105 unsigned int ds = crypto_shash_digestsize(tfm);
106 u8 buf[shash_align_buffer_size(ds, alignmask)]
107 __attribute__ ((aligned));
108 int err;
109
110 err = shash->final(desc, buf);
111 memcpy(out, buf, ds);
112 return err;
113}
114
115int crypto_shash_final(struct shash_desc *desc, u8 *out)
116{
117 struct crypto_shash *tfm = desc->tfm;
118 struct shash_alg *shash = crypto_shash_alg(tfm);
119 unsigned long alignmask = crypto_shash_alignmask(tfm);
120
121 if ((unsigned long)out & alignmask)
122 return shash_final_unaligned(desc, out);
123
124 return shash->final(desc, out);
125}
126EXPORT_SYMBOL_GPL(crypto_shash_final);
127
128static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
129 unsigned int len, u8 *out)
130{
131 return crypto_shash_update(desc, data, len) ?:
132 crypto_shash_final(desc, out);
133}
134
135int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
136 unsigned int len, u8 *out)
137{
138 struct crypto_shash *tfm = desc->tfm;
139 struct shash_alg *shash = crypto_shash_alg(tfm);
140 unsigned long alignmask = crypto_shash_alignmask(tfm);
141
142 if (((unsigned long)data | (unsigned long)out) & alignmask ||
143 !shash->finup)
144 return shash_finup_unaligned(desc, data, len, out);
145
146 return shash->finup(desc, data, len, out);
147}
148EXPORT_SYMBOL_GPL(crypto_shash_finup);
149
150static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
151 unsigned int len, u8 *out)
152{
153 return crypto_shash_init(desc) ?:
154 crypto_shash_update(desc, data, len) ?:
155 crypto_shash_final(desc, out);
156}
157
158int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
159 unsigned int len, u8 *out)
160{
161 struct crypto_shash *tfm = desc->tfm;
162 struct shash_alg *shash = crypto_shash_alg(tfm);
163 unsigned long alignmask = crypto_shash_alignmask(tfm);
164
165 if (((unsigned long)data | (unsigned long)out) & alignmask ||
166 !shash->digest)
167 return shash_digest_unaligned(desc, data, len, out);
168
169 return shash->digest(desc, data, len, out);
170}
171EXPORT_SYMBOL_GPL(crypto_shash_digest);
172
Herbert Xudec8b782008-11-02 21:38:11 +0800173int crypto_shash_import(struct shash_desc *desc, const u8 *in)
174{
175 struct crypto_shash *tfm = desc->tfm;
176 struct shash_alg *alg = crypto_shash_alg(tfm);
177
178 memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm));
179
180 if (alg->reinit)
181 alg->reinit(desc);
182
183 return 0;
184}
185EXPORT_SYMBOL_GPL(crypto_shash_import);
186
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000187static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
188 unsigned int keylen)
189{
190 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
191
192 return crypto_shash_setkey(*ctx, key, keylen);
193}
194
195static int shash_async_init(struct ahash_request *req)
196{
197 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
198 struct shash_desc *desc = ahash_request_ctx(req);
199
200 desc->tfm = *ctx;
201 desc->flags = req->base.flags;
202
203 return crypto_shash_init(desc);
204}
205
206static int shash_async_update(struct ahash_request *req)
207{
208 struct shash_desc *desc = ahash_request_ctx(req);
209 struct crypto_hash_walk walk;
210 int nbytes;
211
212 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
213 nbytes = crypto_hash_walk_done(&walk, nbytes))
214 nbytes = crypto_shash_update(desc, walk.data, nbytes);
215
216 return nbytes;
217}
218
219static int shash_async_final(struct ahash_request *req)
220{
221 return crypto_shash_final(ahash_request_ctx(req), req->result);
222}
223
224static int shash_async_digest(struct ahash_request *req)
225{
226 struct scatterlist *sg = req->src;
227 unsigned int offset = sg->offset;
228 unsigned int nbytes = req->nbytes;
229 int err;
230
231 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
232 struct crypto_shash **ctx =
233 crypto_ahash_ctx(crypto_ahash_reqtfm(req));
234 struct shash_desc *desc = ahash_request_ctx(req);
235 void *data;
236
237 desc->tfm = *ctx;
238 desc->flags = req->base.flags;
239
240 data = crypto_kmap(sg_page(sg), 0);
241 err = crypto_shash_digest(desc, data + offset, nbytes,
242 req->result);
243 crypto_kunmap(data, 0);
244 crypto_yield(desc->flags);
245 goto out;
246 }
247
248 err = shash_async_init(req);
249 if (err)
250 goto out;
251
252 err = shash_async_update(req);
253 if (err)
254 goto out;
255
256 err = shash_async_final(req);
257
258out:
259 return err;
260}
261
262static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
263{
264 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
265
266 crypto_free_shash(*ctx);
267}
268
269static int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
270{
271 struct crypto_alg *calg = tfm->__crt_alg;
272 struct shash_alg *alg = __crypto_shash_alg(calg);
273 struct ahash_tfm *crt = &tfm->crt_ahash;
274 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
275 struct crypto_shash *shash;
276
277 if (!crypto_mod_get(calg))
278 return -EAGAIN;
279
Herbert Xu3f683d62009-02-18 16:56:59 +0800280 shash = crypto_create_tfm(calg, &crypto_shash_type);
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000281 if (IS_ERR(shash)) {
282 crypto_mod_put(calg);
283 return PTR_ERR(shash);
284 }
285
286 *ctx = shash;
287 tfm->exit = crypto_exit_shash_ops_async;
288
289 crt->init = shash_async_init;
290 crt->update = shash_async_update;
291 crt->final = shash_async_final;
292 crt->digest = shash_async_digest;
293 crt->setkey = shash_async_setkey;
294
295 crt->digestsize = alg->digestsize;
296 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
297
298 return 0;
299}
300
Herbert Xu5f7082e2008-08-31 22:21:09 +1000301static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
302 unsigned int keylen)
303{
304 struct shash_desc *desc = crypto_hash_ctx(tfm);
305
306 return crypto_shash_setkey(desc->tfm, key, keylen);
307}
308
309static int shash_compat_init(struct hash_desc *hdesc)
310{
311 struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
312
313 desc->flags = hdesc->flags;
314
315 return crypto_shash_init(desc);
316}
317
318static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
319 unsigned int len)
320{
321 struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
322 struct crypto_hash_walk walk;
323 int nbytes;
324
325 for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
326 nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
327 nbytes = crypto_shash_update(desc, walk.data, nbytes);
328
329 return nbytes;
330}
331
332static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
333{
334 return crypto_shash_final(crypto_hash_ctx(hdesc->tfm), out);
335}
336
337static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
338 unsigned int nbytes, u8 *out)
339{
340 unsigned int offset = sg->offset;
341 int err;
342
343 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
344 struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
345 void *data;
346
347 desc->flags = hdesc->flags;
348
349 data = crypto_kmap(sg_page(sg), 0);
350 err = crypto_shash_digest(desc, data + offset, nbytes, out);
351 crypto_kunmap(data, 0);
352 crypto_yield(desc->flags);
353 goto out;
354 }
355
356 err = shash_compat_init(hdesc);
357 if (err)
358 goto out;
359
360 err = shash_compat_update(hdesc, sg, nbytes);
361 if (err)
362 goto out;
363
364 err = shash_compat_final(hdesc, out);
365
366out:
367 return err;
368}
369
370static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
371{
372 struct shash_desc *desc= crypto_tfm_ctx(tfm);
373
374 crypto_free_shash(desc->tfm);
375}
376
377static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
378{
379 struct hash_tfm *crt = &tfm->crt_hash;
380 struct crypto_alg *calg = tfm->__crt_alg;
381 struct shash_alg *alg = __crypto_shash_alg(calg);
382 struct shash_desc *desc = crypto_tfm_ctx(tfm);
383 struct crypto_shash *shash;
384
Adrian-Ken Rueegsegger4abfd732009-02-05 16:19:31 +1100385 if (!crypto_mod_get(calg))
386 return -EAGAIN;
387
Herbert Xu3f683d62009-02-18 16:56:59 +0800388 shash = crypto_create_tfm(calg, &crypto_shash_type);
Adrian-Ken Rueegsegger4abfd732009-02-05 16:19:31 +1100389 if (IS_ERR(shash)) {
390 crypto_mod_put(calg);
Herbert Xu5f7082e2008-08-31 22:21:09 +1000391 return PTR_ERR(shash);
Adrian-Ken Rueegsegger4abfd732009-02-05 16:19:31 +1100392 }
Herbert Xu5f7082e2008-08-31 22:21:09 +1000393
394 desc->tfm = shash;
395 tfm->exit = crypto_exit_shash_ops_compat;
396
397 crt->init = shash_compat_init;
398 crt->update = shash_compat_update;
399 crt->final = shash_compat_final;
400 crt->digest = shash_compat_digest;
401 crt->setkey = shash_compat_setkey;
402
403 crt->digestsize = alg->digestsize;
404
405 return 0;
406}
407
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000408static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
409{
410 switch (mask & CRYPTO_ALG_TYPE_MASK) {
Herbert Xu5f7082e2008-08-31 22:21:09 +1000411 case CRYPTO_ALG_TYPE_HASH_MASK:
412 return crypto_init_shash_ops_compat(tfm);
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000413 case CRYPTO_ALG_TYPE_AHASH_MASK:
414 return crypto_init_shash_ops_async(tfm);
415 }
416
417 return -EINVAL;
418}
419
420static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
421 u32 mask)
422{
Herbert Xu5f7082e2008-08-31 22:21:09 +1000423 struct shash_alg *salg = __crypto_shash_alg(alg);
424
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000425 switch (mask & CRYPTO_ALG_TYPE_MASK) {
Herbert Xu5f7082e2008-08-31 22:21:09 +1000426 case CRYPTO_ALG_TYPE_HASH_MASK:
427 return sizeof(struct shash_desc) + salg->descsize;
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000428 case CRYPTO_ALG_TYPE_AHASH_MASK:
429 return sizeof(struct crypto_shash *);
430 }
431
432 return 0;
433}
434
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000435static int crypto_shash_init_tfm(struct crypto_tfm *tfm,
436 const struct crypto_type *frontend)
437{
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000438 return 0;
439}
440
441static unsigned int crypto_shash_extsize(struct crypto_alg *alg,
442 const struct crypto_type *frontend)
443{
444 return alg->cra_ctxsize;
445}
446
447static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
448 __attribute__ ((unused));
449static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
450{
451 struct shash_alg *salg = __crypto_shash_alg(alg);
452
453 seq_printf(m, "type : shash\n");
454 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
455 seq_printf(m, "digestsize : %u\n", salg->digestsize);
456 seq_printf(m, "descsize : %u\n", salg->descsize);
457}
458
459static const struct crypto_type crypto_shash_type = {
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000460 .ctxsize = crypto_shash_ctxsize,
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000461 .extsize = crypto_shash_extsize,
Herbert Xu3b2f6df2008-08-31 18:52:18 +1000462 .init = crypto_init_shash_ops,
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000463 .init_tfm = crypto_shash_init_tfm,
464#ifdef CONFIG_PROC_FS
465 .show = crypto_shash_show,
466#endif
467 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
468 .maskset = CRYPTO_ALG_TYPE_MASK,
469 .type = CRYPTO_ALG_TYPE_SHASH,
470 .tfmsize = offsetof(struct crypto_shash, base),
471};
472
473struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
474 u32 mask)
475{
Herbert Xu3f683d62009-02-18 16:56:59 +0800476 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
Herbert Xu7b5a080b2008-08-31 15:47:27 +1000477}
478EXPORT_SYMBOL_GPL(crypto_alloc_shash);
479
480int crypto_register_shash(struct shash_alg *alg)
481{
482 struct crypto_alg *base = &alg->base;
483
484 if (alg->digestsize > PAGE_SIZE / 8 ||
485 alg->descsize > PAGE_SIZE / 8)
486 return -EINVAL;
487
488 base->cra_type = &crypto_shash_type;
489 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
490 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
491
492 return crypto_register_alg(base);
493}
494EXPORT_SYMBOL_GPL(crypto_register_shash);
495
496int crypto_unregister_shash(struct shash_alg *alg)
497{
498 return crypto_unregister_alg(&alg->base);
499}
500EXPORT_SYMBOL_GPL(crypto_unregister_shash);
501
502MODULE_LICENSE("GPL");
503MODULE_DESCRIPTION("Synchronous cryptographic hash type");