2 * Synchronous Cryptographic Hash operations.
4 * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
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)
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>
23 static const struct crypto_type crypto_shash_type;
25 static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
31 static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
34 struct shash_alg *shash = crypto_shash_alg(tfm);
35 unsigned long alignmask = crypto_shash_alignmask(tfm);
37 u8 *buffer, *alignbuffer;
40 absize = keylen + (alignmask & ~(CRYPTO_MINALIGN - 1));
41 buffer = kmalloc(absize, GFP_KERNEL);
45 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
46 memcpy(alignbuffer, key, keylen);
47 err = shash->setkey(tfm, alignbuffer, keylen);
48 memset(alignbuffer, 0, keylen);
53 int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
56 struct shash_alg *shash = crypto_shash_alg(tfm);
57 unsigned long alignmask = crypto_shash_alignmask(tfm);
59 if ((unsigned long)key & alignmask)
60 return shash_setkey_unaligned(tfm, key, keylen);
62 return shash->setkey(tfm, key, keylen);
64 EXPORT_SYMBOL_GPL(crypto_shash_setkey);
66 static inline unsigned int shash_align_buffer_size(unsigned len,
69 return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
72 static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
75 struct crypto_shash *tfm = desc->tfm;
76 struct shash_alg *shash = crypto_shash_alg(tfm);
77 unsigned long alignmask = crypto_shash_alignmask(tfm);
78 unsigned int unaligned_len = alignmask + 1 -
79 ((unsigned long)data & alignmask);
80 u8 buf[shash_align_buffer_size(unaligned_len, alignmask)]
81 __attribute__ ((aligned));
83 if (unaligned_len > len)
86 memcpy(buf, data, unaligned_len);
88 return shash->update(desc, buf, unaligned_len) ?:
89 shash->update(desc, data + unaligned_len, len - unaligned_len);
92 int crypto_shash_update(struct shash_desc *desc, const u8 *data,
95 struct crypto_shash *tfm = desc->tfm;
96 struct shash_alg *shash = crypto_shash_alg(tfm);
97 unsigned long alignmask = crypto_shash_alignmask(tfm);
99 if ((unsigned long)data & alignmask)
100 return shash_update_unaligned(desc, data, len);
102 return shash->update(desc, data, len);
104 EXPORT_SYMBOL_GPL(crypto_shash_update);
106 static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
108 struct crypto_shash *tfm = desc->tfm;
109 unsigned long alignmask = crypto_shash_alignmask(tfm);
110 struct shash_alg *shash = crypto_shash_alg(tfm);
111 unsigned int ds = crypto_shash_digestsize(tfm);
112 u8 buf[shash_align_buffer_size(ds, alignmask)]
113 __attribute__ ((aligned));
116 err = shash->final(desc, buf);
117 memcpy(out, buf, ds);
121 int crypto_shash_final(struct shash_desc *desc, u8 *out)
123 struct crypto_shash *tfm = desc->tfm;
124 struct shash_alg *shash = crypto_shash_alg(tfm);
125 unsigned long alignmask = crypto_shash_alignmask(tfm);
127 if ((unsigned long)out & alignmask)
128 return shash_final_unaligned(desc, out);
130 return shash->final(desc, out);
132 EXPORT_SYMBOL_GPL(crypto_shash_final);
134 static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
135 unsigned int len, u8 *out)
137 return crypto_shash_update(desc, data, len) ?:
138 crypto_shash_final(desc, out);
141 int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
142 unsigned int len, u8 *out)
144 struct crypto_shash *tfm = desc->tfm;
145 struct shash_alg *shash = crypto_shash_alg(tfm);
146 unsigned long alignmask = crypto_shash_alignmask(tfm);
148 if (((unsigned long)data | (unsigned long)out) & alignmask)
149 return shash_finup_unaligned(desc, data, len, out);
151 return shash->finup(desc, data, len, out);
153 EXPORT_SYMBOL_GPL(crypto_shash_finup);
155 static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
156 unsigned int len, u8 *out)
158 return crypto_shash_init(desc) ?:
159 crypto_shash_finup(desc, data, len, out);
162 int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
163 unsigned int len, u8 *out)
165 struct crypto_shash *tfm = desc->tfm;
166 struct shash_alg *shash = crypto_shash_alg(tfm);
167 unsigned long alignmask = crypto_shash_alignmask(tfm);
169 if (((unsigned long)data | (unsigned long)out) & alignmask)
170 return shash_digest_unaligned(desc, data, len, out);
172 return shash->digest(desc, data, len, out);
174 EXPORT_SYMBOL_GPL(crypto_shash_digest);
176 static int shash_no_export(struct shash_desc *desc, void *out)
181 static int shash_no_import(struct shash_desc *desc, const void *in)
186 static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
189 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
191 return crypto_shash_setkey(*ctx, key, keylen);
194 static int shash_async_init(struct ahash_request *req)
196 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
197 struct shash_desc *desc = ahash_request_ctx(req);
200 desc->flags = req->base.flags;
202 return crypto_shash_init(desc);
205 static int shash_async_update(struct ahash_request *req)
207 struct shash_desc *desc = ahash_request_ctx(req);
208 struct crypto_hash_walk walk;
211 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
212 nbytes = crypto_hash_walk_done(&walk, nbytes))
213 nbytes = crypto_shash_update(desc, walk.data, nbytes);
218 static int shash_async_final(struct ahash_request *req)
220 return crypto_shash_final(ahash_request_ctx(req), req->result);
223 static int shash_async_digest(struct ahash_request *req)
225 struct scatterlist *sg = req->src;
226 unsigned int offset = sg->offset;
227 unsigned int nbytes = req->nbytes;
230 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
231 struct crypto_shash **ctx =
232 crypto_ahash_ctx(crypto_ahash_reqtfm(req));
233 struct shash_desc *desc = ahash_request_ctx(req);
237 desc->flags = req->base.flags;
239 data = crypto_kmap(sg_page(sg), 0);
240 err = crypto_shash_digest(desc, data + offset, nbytes,
242 crypto_kunmap(data, 0);
243 crypto_yield(desc->flags);
247 err = shash_async_init(req);
251 err = shash_async_update(req);
255 err = shash_async_final(req);
261 static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
263 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
265 crypto_free_shash(*ctx);
268 static int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
270 struct crypto_alg *calg = tfm->__crt_alg;
271 struct shash_alg *alg = __crypto_shash_alg(calg);
272 struct ahash_tfm *crt = &tfm->crt_ahash;
273 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
274 struct crypto_shash *shash;
276 if (!crypto_mod_get(calg))
279 shash = crypto_create_tfm(calg, &crypto_shash_type);
281 crypto_mod_put(calg);
282 return PTR_ERR(shash);
286 tfm->exit = crypto_exit_shash_ops_async;
288 crt->init = shash_async_init;
289 crt->update = shash_async_update;
290 crt->final = shash_async_final;
291 crt->digest = shash_async_digest;
292 crt->setkey = shash_async_setkey;
294 crt->digestsize = alg->digestsize;
295 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
300 static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
303 struct shash_desc **descp = crypto_hash_ctx(tfm);
304 struct shash_desc *desc = *descp;
306 return crypto_shash_setkey(desc->tfm, key, keylen);
309 static int shash_compat_init(struct hash_desc *hdesc)
311 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
312 struct shash_desc *desc = *descp;
314 desc->flags = hdesc->flags;
316 return crypto_shash_init(desc);
319 static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
322 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
323 struct shash_desc *desc = *descp;
324 struct crypto_hash_walk walk;
327 for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
328 nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
329 nbytes = crypto_shash_update(desc, walk.data, nbytes);
334 static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
336 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
338 return crypto_shash_final(*descp, out);
341 static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
342 unsigned int nbytes, u8 *out)
344 unsigned int offset = sg->offset;
347 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
348 struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
349 struct shash_desc *desc = *descp;
352 desc->flags = hdesc->flags;
354 data = crypto_kmap(sg_page(sg), 0);
355 err = crypto_shash_digest(desc, data + offset, nbytes, out);
356 crypto_kunmap(data, 0);
357 crypto_yield(desc->flags);
361 err = shash_compat_init(hdesc);
365 err = shash_compat_update(hdesc, sg, nbytes);
369 err = shash_compat_final(hdesc, out);
375 static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
377 struct shash_desc **descp = crypto_tfm_ctx(tfm);
378 struct shash_desc *desc = *descp;
380 crypto_free_shash(desc->tfm);
384 static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
386 struct hash_tfm *crt = &tfm->crt_hash;
387 struct crypto_alg *calg = tfm->__crt_alg;
388 struct shash_alg *alg = __crypto_shash_alg(calg);
389 struct shash_desc **descp = crypto_tfm_ctx(tfm);
390 struct crypto_shash *shash;
391 struct shash_desc *desc;
393 if (!crypto_mod_get(calg))
396 shash = crypto_create_tfm(calg, &crypto_shash_type);
398 crypto_mod_put(calg);
399 return PTR_ERR(shash);
402 desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
405 crypto_free_shash(shash);
411 tfm->exit = crypto_exit_shash_ops_compat;
413 crt->init = shash_compat_init;
414 crt->update = shash_compat_update;
415 crt->final = shash_compat_final;
416 crt->digest = shash_compat_digest;
417 crt->setkey = shash_compat_setkey;
419 crt->digestsize = alg->digestsize;
424 static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
426 switch (mask & CRYPTO_ALG_TYPE_MASK) {
427 case CRYPTO_ALG_TYPE_HASH_MASK:
428 return crypto_init_shash_ops_compat(tfm);
429 case CRYPTO_ALG_TYPE_AHASH_MASK:
430 return crypto_init_shash_ops_async(tfm);
436 static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
439 switch (mask & CRYPTO_ALG_TYPE_MASK) {
440 case CRYPTO_ALG_TYPE_HASH_MASK:
441 return sizeof(struct shash_desc *);
442 case CRYPTO_ALG_TYPE_AHASH_MASK:
443 return sizeof(struct crypto_shash *);
449 static int crypto_shash_init_tfm(struct crypto_tfm *tfm,
450 const struct crypto_type *frontend)
452 struct crypto_shash *hash = __crypto_shash_cast(tfm);
454 hash->descsize = crypto_shash_alg(hash)->descsize;
458 static unsigned int crypto_shash_extsize(struct crypto_alg *alg,
459 const struct crypto_type *frontend)
461 return alg->cra_ctxsize;
464 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
465 __attribute__ ((unused));
466 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
468 struct shash_alg *salg = __crypto_shash_alg(alg);
470 seq_printf(m, "type : shash\n");
471 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
472 seq_printf(m, "digestsize : %u\n", salg->digestsize);
475 static const struct crypto_type crypto_shash_type = {
476 .ctxsize = crypto_shash_ctxsize,
477 .extsize = crypto_shash_extsize,
478 .init = crypto_init_shash_ops,
479 .init_tfm = crypto_shash_init_tfm,
480 #ifdef CONFIG_PROC_FS
481 .show = crypto_shash_show,
483 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
484 .maskset = CRYPTO_ALG_TYPE_MASK,
485 .type = CRYPTO_ALG_TYPE_SHASH,
486 .tfmsize = offsetof(struct crypto_shash, base),
489 struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
492 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
494 EXPORT_SYMBOL_GPL(crypto_alloc_shash);
496 static int shash_prepare_alg(struct shash_alg *alg)
498 struct crypto_alg *base = &alg->base;
500 if (alg->digestsize > PAGE_SIZE / 8 ||
501 alg->descsize > PAGE_SIZE / 8 ||
502 alg->statesize > PAGE_SIZE / 8)
505 base->cra_type = &crypto_shash_type;
506 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
507 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
510 alg->finup = shash_finup_unaligned;
512 alg->digest = shash_digest_unaligned;
514 alg->import = shash_no_import;
516 alg->export = shash_no_export;
518 alg->setkey = shash_no_setkey;
523 int crypto_register_shash(struct shash_alg *alg)
525 struct crypto_alg *base = &alg->base;
528 err = shash_prepare_alg(alg);
532 return crypto_register_alg(base);
534 EXPORT_SYMBOL_GPL(crypto_register_shash);
536 int crypto_unregister_shash(struct shash_alg *alg)
538 return crypto_unregister_alg(&alg->base);
540 EXPORT_SYMBOL_GPL(crypto_unregister_shash);
542 int shash_register_instance(struct crypto_template *tmpl,
543 struct shash_instance *inst)
547 err = shash_prepare_alg(&inst->alg);
551 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
553 EXPORT_SYMBOL_GPL(shash_register_instance);
555 void shash_free_instance(struct crypto_instance *inst)
557 crypto_drop_spawn(crypto_instance_ctx(inst));
558 kfree(shash_instance(inst));
560 EXPORT_SYMBOL_GPL(shash_free_instance);
562 int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
563 struct shash_alg *alg,
564 struct crypto_instance *inst)
566 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
569 EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
571 struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
573 struct crypto_alg *alg;
575 alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
576 return IS_ERR(alg) ? ERR_CAST(alg) :
577 container_of(alg, struct shash_alg, base);
579 EXPORT_SYMBOL_GPL(shash_attr_alg);
581 MODULE_LICENSE("GPL");
582 MODULE_DESCRIPTION("Synchronous cryptographic hash type");