2 * Asynchronous block chaining cipher operations.
4 * This is the asynchronous version of blkcipher.c indicating completion
7 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
16 #include <crypto/internal/skcipher.h>
17 #include <linux/cpumask.h>
18 #include <linux/err.h>
19 #include <linux/kernel.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/sched.h>
22 #include <linux/slab.h>
23 #include <linux/seq_file.h>
24 #include <linux/cryptouser.h>
25 #include <net/netlink.h>
27 #include <crypto/scatterwalk.h>
31 struct ablkcipher_buffer {
32 struct list_head entry;
33 struct scatter_walk dst;
39 ABLKCIPHER_WALK_SLOW = 1 << 0,
42 static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p)
44 scatterwalk_copychunks(p->data, &p->dst, p->len, 1);
47 void __ablkcipher_walk_complete(struct ablkcipher_walk *walk)
49 struct ablkcipher_buffer *p, *tmp;
51 list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {
52 ablkcipher_buffer_write(p);
57 EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete);
59 static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk,
60 struct ablkcipher_buffer *p)
63 list_add_tail(&p->entry, &walk->buffers);
66 /* Get a spot of the specified length that does not straddle a page.
67 * The caller needs to ensure that there is enough space for this operation.
69 static inline u8 *ablkcipher_get_spot(u8 *start, unsigned int len)
71 u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
73 return max(start, end_page);
76 static inline unsigned int ablkcipher_done_slow(struct ablkcipher_walk *walk,
79 unsigned int n = bsize;
82 unsigned int len_this_page = scatterwalk_pagelen(&walk->out);
84 if (len_this_page > n)
86 scatterwalk_advance(&walk->out, n);
87 if (n == len_this_page)
90 scatterwalk_start(&walk->out, sg_next(walk->out.sg));
96 static inline unsigned int ablkcipher_done_fast(struct ablkcipher_walk *walk,
99 scatterwalk_advance(&walk->in, n);
100 scatterwalk_advance(&walk->out, n);
105 static int ablkcipher_walk_next(struct ablkcipher_request *req,
106 struct ablkcipher_walk *walk);
108 int ablkcipher_walk_done(struct ablkcipher_request *req,
109 struct ablkcipher_walk *walk, int err)
111 struct crypto_tfm *tfm = req->base.tfm;
112 unsigned int nbytes = 0;
114 if (likely(err >= 0)) {
115 unsigned int n = walk->nbytes - err;
117 if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW)))
118 n = ablkcipher_done_fast(walk, n);
119 else if (WARN_ON(err)) {
123 n = ablkcipher_done_slow(walk, n);
125 nbytes = walk->total - n;
129 scatterwalk_done(&walk->in, 0, nbytes);
130 scatterwalk_done(&walk->out, 1, nbytes);
133 walk->total = nbytes;
134 walk->nbytes = nbytes;
137 crypto_yield(req->base.flags);
138 return ablkcipher_walk_next(req, walk);
141 if (walk->iv != req->info)
142 memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize);
143 kfree(walk->iv_buffer);
147 EXPORT_SYMBOL_GPL(ablkcipher_walk_done);
149 static inline int ablkcipher_next_slow(struct ablkcipher_request *req,
150 struct ablkcipher_walk *walk,
152 unsigned int alignmask,
153 void **src_p, void **dst_p)
155 unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
156 struct ablkcipher_buffer *p;
157 void *src, *dst, *base;
160 n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1);
161 n += (aligned_bsize * 3 - (alignmask + 1) +
162 (alignmask & ~(crypto_tfm_ctx_alignment() - 1)));
164 p = kmalloc(n, GFP_ATOMIC);
166 return ablkcipher_walk_done(req, walk, -ENOMEM);
170 dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1);
171 src = dst = ablkcipher_get_spot(dst, bsize);
176 scatterwalk_copychunks(src, &walk->in, bsize, 0);
178 ablkcipher_queue_write(walk, p);
180 walk->nbytes = bsize;
181 walk->flags |= ABLKCIPHER_WALK_SLOW;
189 static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk,
190 struct crypto_tfm *tfm,
191 unsigned int alignmask)
193 unsigned bs = walk->blocksize;
194 unsigned int ivsize = tfm->crt_ablkcipher.ivsize;
195 unsigned aligned_bs = ALIGN(bs, alignmask + 1);
196 unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
200 size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
201 walk->iv_buffer = kmalloc(size, GFP_ATOMIC);
202 if (!walk->iv_buffer)
205 iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1);
206 iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
207 iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
208 iv = ablkcipher_get_spot(iv, ivsize);
210 walk->iv = memcpy(iv, walk->iv, ivsize);
214 static inline int ablkcipher_next_fast(struct ablkcipher_request *req,
215 struct ablkcipher_walk *walk)
217 walk->src.page = scatterwalk_page(&walk->in);
218 walk->src.offset = offset_in_page(walk->in.offset);
219 walk->dst.page = scatterwalk_page(&walk->out);
220 walk->dst.offset = offset_in_page(walk->out.offset);
225 static int ablkcipher_walk_next(struct ablkcipher_request *req,
226 struct ablkcipher_walk *walk)
228 struct crypto_tfm *tfm = req->base.tfm;
229 unsigned int alignmask, bsize, n;
233 alignmask = crypto_tfm_alg_alignmask(tfm);
235 if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) {
236 req->base.flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
237 return ablkcipher_walk_done(req, walk, -EINVAL);
240 walk->flags &= ~ABLKCIPHER_WALK_SLOW;
243 bsize = min(walk->blocksize, n);
244 n = scatterwalk_clamp(&walk->in, n);
245 n = scatterwalk_clamp(&walk->out, n);
248 !scatterwalk_aligned(&walk->in, alignmask) ||
249 !scatterwalk_aligned(&walk->out, alignmask)) {
250 err = ablkcipher_next_slow(req, walk, bsize, alignmask,
252 goto set_phys_lowmem;
257 return ablkcipher_next_fast(req, walk);
261 walk->src.page = virt_to_page(src);
262 walk->dst.page = virt_to_page(dst);
263 walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1));
264 walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1));
270 static int ablkcipher_walk_first(struct ablkcipher_request *req,
271 struct ablkcipher_walk *walk)
273 struct crypto_tfm *tfm = req->base.tfm;
274 unsigned int alignmask;
276 alignmask = crypto_tfm_alg_alignmask(tfm);
277 if (WARN_ON_ONCE(in_irq()))
280 walk->iv = req->info;
281 walk->nbytes = walk->total;
282 if (unlikely(!walk->total))
285 walk->iv_buffer = NULL;
286 if (unlikely(((unsigned long)walk->iv & alignmask))) {
287 int err = ablkcipher_copy_iv(walk, tfm, alignmask);
293 scatterwalk_start(&walk->in, walk->in.sg);
294 scatterwalk_start(&walk->out, walk->out.sg);
296 return ablkcipher_walk_next(req, walk);
299 int ablkcipher_walk_phys(struct ablkcipher_request *req,
300 struct ablkcipher_walk *walk)
302 walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm);
303 return ablkcipher_walk_first(req, walk);
305 EXPORT_SYMBOL_GPL(ablkcipher_walk_phys);
307 static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key,
310 struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
311 unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
313 u8 *buffer, *alignbuffer;
314 unsigned long absize;
316 absize = keylen + alignmask;
317 buffer = kmalloc(absize, GFP_ATOMIC);
321 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
322 memcpy(alignbuffer, key, keylen);
323 ret = cipher->setkey(tfm, alignbuffer, keylen);
324 memset(alignbuffer, 0, keylen);
329 static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
332 struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
333 unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
335 if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
336 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
340 if ((unsigned long)key & alignmask)
341 return setkey_unaligned(tfm, key, keylen);
343 return cipher->setkey(tfm, key, keylen);
346 static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
349 return alg->cra_ctxsize;
352 int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req)
354 return crypto_ablkcipher_encrypt(&req->creq);
357 int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req)
359 return crypto_ablkcipher_decrypt(&req->creq);
362 static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
365 struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
366 struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
368 if (alg->ivsize > PAGE_SIZE / 8)
371 crt->setkey = setkey;
372 crt->encrypt = alg->encrypt;
373 crt->decrypt = alg->decrypt;
375 crt->givencrypt = skcipher_null_givencrypt;
376 crt->givdecrypt = skcipher_null_givdecrypt;
378 crt->base = __crypto_ablkcipher_cast(tfm);
379 crt->ivsize = alg->ivsize;
385 static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
387 struct crypto_report_blkcipher rblkcipher;
389 strncpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type));
390 strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>",
391 sizeof(rblkcipher.geniv));
393 rblkcipher.blocksize = alg->cra_blocksize;
394 rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
395 rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
396 rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;
398 if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
399 sizeof(struct crypto_report_blkcipher), &rblkcipher))
400 goto nla_put_failure;
407 static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
413 static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
414 __attribute__ ((unused));
415 static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
417 struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
419 seq_printf(m, "type : ablkcipher\n");
420 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
422 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
423 seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
424 seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
425 seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
426 seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>");
429 const struct crypto_type crypto_ablkcipher_type = {
430 .ctxsize = crypto_ablkcipher_ctxsize,
431 .init = crypto_init_ablkcipher_ops,
432 #ifdef CONFIG_PROC_FS
433 .show = crypto_ablkcipher_show,
435 .report = crypto_ablkcipher_report,
437 EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
439 static int no_givdecrypt(struct skcipher_givcrypt_request *req)
444 static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
447 struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
448 struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
450 if (alg->ivsize > PAGE_SIZE / 8)
453 crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
454 alg->setkey : setkey;
455 crt->encrypt = alg->encrypt;
456 crt->decrypt = alg->decrypt;
457 crt->givencrypt = alg->givencrypt ?: no_givdecrypt;
458 crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
459 crt->base = __crypto_ablkcipher_cast(tfm);
460 crt->ivsize = alg->ivsize;
466 static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
468 struct crypto_report_blkcipher rblkcipher;
470 strncpy(rblkcipher.type, "givcipher", sizeof(rblkcipher.type));
471 strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<built-in>",
472 sizeof(rblkcipher.geniv));
474 rblkcipher.blocksize = alg->cra_blocksize;
475 rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
476 rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
477 rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;
479 if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
480 sizeof(struct crypto_report_blkcipher), &rblkcipher))
481 goto nla_put_failure;
488 static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
494 static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
495 __attribute__ ((unused));
496 static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
498 struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
500 seq_printf(m, "type : givcipher\n");
501 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
503 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
504 seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
505 seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
506 seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
507 seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>");
510 const struct crypto_type crypto_givcipher_type = {
511 .ctxsize = crypto_ablkcipher_ctxsize,
512 .init = crypto_init_givcipher_ops,
513 #ifdef CONFIG_PROC_FS
514 .show = crypto_givcipher_show,
516 .report = crypto_givcipher_report,
518 EXPORT_SYMBOL_GPL(crypto_givcipher_type);
520 const char *crypto_default_geniv(const struct crypto_alg *alg)
522 if (((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
523 CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
524 alg->cra_ablkcipher.ivsize) !=
531 static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask)
533 struct rtattr *tb[3];
536 struct crypto_attr_type data;
540 struct crypto_attr_alg data;
542 struct crypto_template *tmpl;
543 struct crypto_instance *inst;
544 struct crypto_alg *larval;
548 larval = crypto_larval_lookup(alg->cra_driver_name,
549 (type & ~CRYPTO_ALG_TYPE_MASK) |
550 CRYPTO_ALG_TYPE_GIVCIPHER,
551 mask | CRYPTO_ALG_TYPE_MASK);
552 err = PTR_ERR(larval);
557 if (!crypto_is_larval(larval))
560 ptype.attr.rta_len = sizeof(ptype);
561 ptype.attr.rta_type = CRYPTOA_TYPE;
562 ptype.data.type = type | CRYPTO_ALG_GENIV;
563 /* GENIV tells the template that we're making a default geniv. */
564 ptype.data.mask = mask | CRYPTO_ALG_GENIV;
567 palg.attr.rta_len = sizeof(palg);
568 palg.attr.rta_type = CRYPTOA_ALG;
569 /* Must use the exact name to locate ourselves. */
570 memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
575 if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
576 CRYPTO_ALG_TYPE_BLKCIPHER)
577 geniv = alg->cra_blkcipher.geniv;
579 geniv = alg->cra_ablkcipher.geniv;
582 geniv = crypto_default_geniv(alg);
584 tmpl = crypto_lookup_template(geniv);
590 err = tmpl->create(tmpl, tb);
596 inst = tmpl->alloc(tb);
601 err = crypto_register_instance(tmpl, inst);
608 /* Redo the lookup to use the instance we just registered. */
612 crypto_tmpl_put(tmpl);
614 crypto_larval_kill(larval);
616 crypto_mod_put(larval);
622 struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type, u32 mask)
624 struct crypto_alg *alg;
626 alg = crypto_alg_mod_lookup(name, type, mask);
630 if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
631 CRYPTO_ALG_TYPE_GIVCIPHER)
634 if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
635 CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
636 alg->cra_ablkcipher.ivsize))
640 alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,
641 mask & ~CRYPTO_ALG_TESTED);
645 if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
646 CRYPTO_ALG_TYPE_GIVCIPHER) {
647 if (~alg->cra_flags & (type ^ ~mask) & CRYPTO_ALG_TESTED) {
649 alg = ERR_PTR(-ENOENT);
654 BUG_ON(!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
655 CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
656 alg->cra_ablkcipher.ivsize));
658 return ERR_PTR(crypto_givcipher_default(alg, type, mask));
660 EXPORT_SYMBOL_GPL(crypto_lookup_skcipher);
662 int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
665 struct crypto_alg *alg;
668 type = crypto_skcipher_type(type);
669 mask = crypto_skcipher_mask(mask);
671 alg = crypto_lookup_skcipher(name, type, mask);
675 err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
679 EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
681 struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name,
684 struct crypto_tfm *tfm;
687 type = crypto_skcipher_type(type);
688 mask = crypto_skcipher_mask(mask);
691 struct crypto_alg *alg;
693 alg = crypto_lookup_skcipher(alg_name, type, mask);
699 tfm = __crypto_alloc_tfm(alg, type, mask);
701 return __crypto_ablkcipher_cast(tfm);
709 if (fatal_signal_pending(current)) {
717 EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher);