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_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
28 struct shash_alg *shash = crypto_shash_alg(tfm);
29 unsigned long alignmask = crypto_shash_alignmask(tfm);
31 u8 *buffer, *alignbuffer;
34 absize = keylen + (alignmask & ~(CRYPTO_MINALIGN - 1));
35 buffer = kmalloc(absize, GFP_KERNEL);
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);
47 int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
50 struct shash_alg *shash = crypto_shash_alg(tfm);
51 unsigned long alignmask = crypto_shash_alignmask(tfm);
56 if ((unsigned long)key & alignmask)
57 return shash_setkey_unaligned(tfm, key, keylen);
59 return shash->setkey(tfm, key, keylen);
61 EXPORT_SYMBOL_GPL(crypto_shash_setkey);
63 static inline unsigned int shash_align_buffer_size(unsigned len,
66 return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1));
69 static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
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));
80 if (unaligned_len > len)
83 memcpy(buf, data, unaligned_len);
85 return shash->update(desc, buf, unaligned_len) ?:
86 shash->update(desc, data + unaligned_len, len - unaligned_len);
89 int crypto_shash_update(struct shash_desc *desc, const u8 *data,
92 struct crypto_shash *tfm = desc->tfm;
93 struct shash_alg *shash = crypto_shash_alg(tfm);
94 unsigned long alignmask = crypto_shash_alignmask(tfm);
96 if ((unsigned long)data & alignmask)
97 return shash_update_unaligned(desc, data, len);
99 return shash->update(desc, data, len);
101 EXPORT_SYMBOL_GPL(crypto_shash_update);
103 static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
105 struct crypto_shash *tfm = desc->tfm;
106 unsigned long alignmask = crypto_shash_alignmask(tfm);
107 struct shash_alg *shash = crypto_shash_alg(tfm);
108 unsigned int ds = crypto_shash_digestsize(tfm);
109 u8 buf[shash_align_buffer_size(ds, alignmask)]
110 __attribute__ ((aligned));
113 err = shash->final(desc, buf);
114 memcpy(out, buf, ds);
118 int crypto_shash_final(struct shash_desc *desc, u8 *out)
120 struct crypto_shash *tfm = desc->tfm;
121 struct shash_alg *shash = crypto_shash_alg(tfm);
122 unsigned long alignmask = crypto_shash_alignmask(tfm);
124 if ((unsigned long)out & alignmask)
125 return shash_final_unaligned(desc, out);
127 return shash->final(desc, out);
129 EXPORT_SYMBOL_GPL(crypto_shash_final);
131 static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
132 unsigned int len, u8 *out)
134 return crypto_shash_update(desc, data, len) ?:
135 crypto_shash_final(desc, out);
138 int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
139 unsigned int len, u8 *out)
141 struct crypto_shash *tfm = desc->tfm;
142 struct shash_alg *shash = crypto_shash_alg(tfm);
143 unsigned long alignmask = crypto_shash_alignmask(tfm);
145 if (((unsigned long)data | (unsigned long)out) & alignmask)
146 return shash_finup_unaligned(desc, data, len, out);
148 return shash->finup(desc, data, len, out);
150 EXPORT_SYMBOL_GPL(crypto_shash_finup);
152 static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
153 unsigned int len, u8 *out)
155 return crypto_shash_init(desc) ?:
156 crypto_shash_finup(desc, data, len, out);
159 int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
160 unsigned int len, u8 *out)
162 struct crypto_shash *tfm = desc->tfm;
163 struct shash_alg *shash = crypto_shash_alg(tfm);
164 unsigned long alignmask = crypto_shash_alignmask(tfm);
166 if (((unsigned long)data | (unsigned long)out) & alignmask)
167 return shash_digest_unaligned(desc, data, len, out);
169 return shash->digest(desc, data, len, out);
171 EXPORT_SYMBOL_GPL(crypto_shash_digest);
173 static int shash_no_export(struct shash_desc *desc, void *out)
178 static int shash_no_import(struct shash_desc *desc, const void *in)
183 static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
186 struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
188 return crypto_shash_setkey(*ctx, key, keylen);
191 static int shash_async_init(struct ahash_request *req)
193 struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
194 struct shash_desc *desc = ahash_request_ctx(req);
197 desc->flags = req->base.flags;
199 return crypto_shash_init(desc);
202 static int shash_async_update(struct ahash_request *req)
204 struct shash_desc *desc = ahash_request_ctx(req);
205 struct crypto_hash_walk walk;
208 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
209 nbytes = crypto_hash_walk_done(&walk, nbytes))
210 nbytes = crypto_shash_update(desc, walk.data, nbytes);
215 static int shash_async_final(struct ahash_request *req)
217 return crypto_shash_final(ahash_request_ctx(req), req->result);
220 static int shash_async_digest(struct ahash_request *req)
222 struct scatterlist *sg = req->src;
223 unsigned int offset = sg->offset;
224 unsigned int nbytes = req->nbytes;
227 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
228 struct crypto_shash **ctx =
229 crypto_ahash_ctx(crypto_ahash_reqtfm(req));
230 struct shash_desc *desc = ahash_request_ctx(req);
234 desc->flags = req->base.flags;
236 data = crypto_kmap(sg_page(sg), 0);
237 err = crypto_shash_digest(desc, data + offset, nbytes,
239 crypto_kunmap(data, 0);
240 crypto_yield(desc->flags);
244 err = shash_async_init(req);
248 err = shash_async_update(req);
252 err = shash_async_final(req);
258 static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
260 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
262 crypto_free_shash(*ctx);
265 static int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
267 struct crypto_alg *calg = tfm->__crt_alg;
268 struct shash_alg *alg = __crypto_shash_alg(calg);
269 struct ahash_tfm *crt = &tfm->crt_ahash;
270 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
271 struct crypto_shash *shash;
273 if (!crypto_mod_get(calg))
276 shash = crypto_create_tfm(calg, &crypto_shash_type);
278 crypto_mod_put(calg);
279 return PTR_ERR(shash);
283 tfm->exit = crypto_exit_shash_ops_async;
285 crt->init = shash_async_init;
286 crt->update = shash_async_update;
287 crt->final = shash_async_final;
288 crt->digest = shash_async_digest;
289 crt->setkey = shash_async_setkey;
291 crt->digestsize = alg->digestsize;
292 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
297 static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
300 struct shash_desc *desc = crypto_hash_ctx(tfm);
302 return crypto_shash_setkey(desc->tfm, key, keylen);
305 static int shash_compat_init(struct hash_desc *hdesc)
307 struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
309 desc->flags = hdesc->flags;
311 return crypto_shash_init(desc);
314 static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
317 struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
318 struct crypto_hash_walk walk;
321 for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len);
322 nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes))
323 nbytes = crypto_shash_update(desc, walk.data, nbytes);
328 static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
330 return crypto_shash_final(crypto_hash_ctx(hdesc->tfm), out);
333 static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
334 unsigned int nbytes, u8 *out)
336 unsigned int offset = sg->offset;
339 if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
340 struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
343 desc->flags = hdesc->flags;
345 data = crypto_kmap(sg_page(sg), 0);
346 err = crypto_shash_digest(desc, data + offset, nbytes, out);
347 crypto_kunmap(data, 0);
348 crypto_yield(desc->flags);
352 err = shash_compat_init(hdesc);
356 err = shash_compat_update(hdesc, sg, nbytes);
360 err = shash_compat_final(hdesc, out);
366 static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
368 struct shash_desc *desc= crypto_tfm_ctx(tfm);
370 crypto_free_shash(desc->tfm);
373 static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
375 struct hash_tfm *crt = &tfm->crt_hash;
376 struct crypto_alg *calg = tfm->__crt_alg;
377 struct shash_alg *alg = __crypto_shash_alg(calg);
378 struct shash_desc *desc = crypto_tfm_ctx(tfm);
379 struct crypto_shash *shash;
381 if (!crypto_mod_get(calg))
384 shash = crypto_create_tfm(calg, &crypto_shash_type);
386 crypto_mod_put(calg);
387 return PTR_ERR(shash);
391 tfm->exit = crypto_exit_shash_ops_compat;
393 crt->init = shash_compat_init;
394 crt->update = shash_compat_update;
395 crt->final = shash_compat_final;
396 crt->digest = shash_compat_digest;
397 crt->setkey = shash_compat_setkey;
399 crt->digestsize = alg->digestsize;
404 static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
406 switch (mask & CRYPTO_ALG_TYPE_MASK) {
407 case CRYPTO_ALG_TYPE_HASH_MASK:
408 return crypto_init_shash_ops_compat(tfm);
409 case CRYPTO_ALG_TYPE_AHASH_MASK:
410 return crypto_init_shash_ops_async(tfm);
416 static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
419 struct shash_alg *salg = __crypto_shash_alg(alg);
421 switch (mask & CRYPTO_ALG_TYPE_MASK) {
422 case CRYPTO_ALG_TYPE_HASH_MASK:
423 return sizeof(struct shash_desc) + salg->descsize;
424 case CRYPTO_ALG_TYPE_AHASH_MASK:
425 return sizeof(struct crypto_shash *);
431 static int crypto_shash_init_tfm(struct crypto_tfm *tfm,
432 const struct crypto_type *frontend)
437 static unsigned int crypto_shash_extsize(struct crypto_alg *alg,
438 const struct crypto_type *frontend)
440 return alg->cra_ctxsize;
443 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
444 __attribute__ ((unused));
445 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
447 struct shash_alg *salg = __crypto_shash_alg(alg);
449 seq_printf(m, "type : shash\n");
450 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
451 seq_printf(m, "digestsize : %u\n", salg->digestsize);
452 seq_printf(m, "descsize : %u\n", salg->descsize);
455 static const struct crypto_type crypto_shash_type = {
456 .ctxsize = crypto_shash_ctxsize,
457 .extsize = crypto_shash_extsize,
458 .init = crypto_init_shash_ops,
459 .init_tfm = crypto_shash_init_tfm,
460 #ifdef CONFIG_PROC_FS
461 .show = crypto_shash_show,
463 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
464 .maskset = CRYPTO_ALG_TYPE_MASK,
465 .type = CRYPTO_ALG_TYPE_SHASH,
466 .tfmsize = offsetof(struct crypto_shash, base),
469 struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
472 return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
474 EXPORT_SYMBOL_GPL(crypto_alloc_shash);
476 static int shash_prepare_alg(struct shash_alg *alg)
478 struct crypto_alg *base = &alg->base;
480 if (alg->digestsize > PAGE_SIZE / 8 ||
481 alg->descsize > PAGE_SIZE / 8 ||
482 alg->statesize > PAGE_SIZE / 8)
485 base->cra_type = &crypto_shash_type;
486 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
487 base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
490 alg->finup = shash_finup_unaligned;
492 alg->digest = shash_digest_unaligned;
494 alg->import = shash_no_import;
496 alg->export = shash_no_export;
501 int crypto_register_shash(struct shash_alg *alg)
503 struct crypto_alg *base = &alg->base;
506 err = shash_prepare_alg(alg);
510 return crypto_register_alg(base);
512 EXPORT_SYMBOL_GPL(crypto_register_shash);
514 int crypto_unregister_shash(struct shash_alg *alg)
516 return crypto_unregister_alg(&alg->base);
518 EXPORT_SYMBOL_GPL(crypto_unregister_shash);
520 int shash_register_instance(struct crypto_template *tmpl,
521 struct shash_instance *inst)
525 err = shash_prepare_alg(&inst->alg);
529 return crypto_register_instance(tmpl, shash_crypto_instance(inst));
531 EXPORT_SYMBOL_GPL(shash_register_instance);
533 void shash_free_instance(struct crypto_instance *inst)
535 crypto_drop_spawn(crypto_instance_ctx(inst));
536 kfree(shash_instance(inst));
538 EXPORT_SYMBOL_GPL(shash_free_instance);
540 int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
541 struct shash_alg *alg,
542 struct crypto_instance *inst)
544 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
547 EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
549 struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
551 struct crypto_alg *alg;
553 alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
554 return IS_ERR(alg) ? ERR_CAST(alg) :
555 container_of(alg, struct shash_alg, base);
557 EXPORT_SYMBOL_GPL(shash_attr_alg);
559 MODULE_LICENSE("GPL");
560 MODULE_DESCRIPTION("Synchronous cryptographic hash type");