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/err.h>
18 #include <linux/kernel.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/sched.h>
21 #include <linux/slab.h>
22 #include <linux/seq_file.h>
23 #include <linux/cryptouser.h>
24 #include <net/netlink.h>
26 #include <crypto/scatterwalk.h>
30 struct ablkcipher_buffer {
31 struct list_head entry;
32 struct scatter_walk dst;
38 ABLKCIPHER_WALK_SLOW = 1 << 0,
41 static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p)
43 scatterwalk_copychunks(p->data, &p->dst, p->len, 1);
46 void __ablkcipher_walk_complete(struct ablkcipher_walk *walk)
48 struct ablkcipher_buffer *p, *tmp;
50 list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {
51 ablkcipher_buffer_write(p);
56 EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete);
58 static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk,
59 struct ablkcipher_buffer *p)
62 list_add_tail(&p->entry, &walk->buffers);
65 /* Get a spot of the specified length that does not straddle a page.
66 * The caller needs to ensure that there is enough space for this operation.
68 static inline u8 *ablkcipher_get_spot(u8 *start, unsigned int len)
70 u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
72 return max(start, end_page);
75 static inline unsigned int ablkcipher_done_slow(struct ablkcipher_walk *walk,
78 unsigned int n = bsize;
81 unsigned int len_this_page = scatterwalk_pagelen(&walk->out);
83 if (len_this_page > n)
85 scatterwalk_advance(&walk->out, n);
86 if (n == len_this_page)
89 scatterwalk_start(&walk->out, sg_next(walk->out.sg));
95 static inline unsigned int ablkcipher_done_fast(struct ablkcipher_walk *walk,
98 scatterwalk_advance(&walk->in, n);
99 scatterwalk_advance(&walk->out, n);
104 static int ablkcipher_walk_next(struct ablkcipher_request *req,
105 struct ablkcipher_walk *walk);
107 int ablkcipher_walk_done(struct ablkcipher_request *req,
108 struct ablkcipher_walk *walk, int err)
110 struct crypto_tfm *tfm = req->base.tfm;
111 unsigned int nbytes = 0;
113 if (likely(err >= 0)) {
114 unsigned int n = walk->nbytes - err;
116 if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW)))
117 n = ablkcipher_done_fast(walk, n);
118 else if (WARN_ON(err)) {
122 n = ablkcipher_done_slow(walk, n);
124 nbytes = walk->total - n;
128 scatterwalk_done(&walk->in, 0, nbytes);
129 scatterwalk_done(&walk->out, 1, nbytes);
132 walk->total = nbytes;
133 walk->nbytes = nbytes;
136 crypto_yield(req->base.flags);
137 return ablkcipher_walk_next(req, walk);
140 if (walk->iv != req->info)
141 memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize);
142 kfree(walk->iv_buffer);
146 EXPORT_SYMBOL_GPL(ablkcipher_walk_done);
148 static inline int ablkcipher_next_slow(struct ablkcipher_request *req,
149 struct ablkcipher_walk *walk,
151 unsigned int alignmask,
152 void **src_p, void **dst_p)
154 unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
155 struct ablkcipher_buffer *p;
156 void *src, *dst, *base;
159 n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1);
160 n += (aligned_bsize * 3 - (alignmask + 1) +
161 (alignmask & ~(crypto_tfm_ctx_alignment() - 1)));
163 p = kmalloc(n, GFP_ATOMIC);
165 return ablkcipher_walk_done(req, walk, -ENOMEM);
169 dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1);
170 src = dst = ablkcipher_get_spot(dst, bsize);
175 scatterwalk_copychunks(src, &walk->in, bsize, 0);
177 ablkcipher_queue_write(walk, p);
179 walk->nbytes = bsize;
180 walk->flags |= ABLKCIPHER_WALK_SLOW;
188 static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk,
189 struct crypto_tfm *tfm,
190 unsigned int alignmask)
192 unsigned bs = walk->blocksize;
193 unsigned int ivsize = tfm->crt_ablkcipher.ivsize;
194 unsigned aligned_bs = ALIGN(bs, alignmask + 1);
195 unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
199 size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
200 walk->iv_buffer = kmalloc(size, GFP_ATOMIC);
201 if (!walk->iv_buffer)
204 iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1);
205 iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
206 iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
207 iv = ablkcipher_get_spot(iv, ivsize);
209 walk->iv = memcpy(iv, walk->iv, ivsize);
213 static inline int ablkcipher_next_fast(struct ablkcipher_request *req,
214 struct ablkcipher_walk *walk)
216 walk->src.page = scatterwalk_page(&walk->in);
217 walk->src.offset = offset_in_page(walk->in.offset);
218 walk->dst.page = scatterwalk_page(&walk->out);
219 walk->dst.offset = offset_in_page(walk->out.offset);
224 static int ablkcipher_walk_next(struct ablkcipher_request *req,
225 struct ablkcipher_walk *walk)
227 struct crypto_tfm *tfm = req->base.tfm;
228 unsigned int alignmask, bsize, n;
232 alignmask = crypto_tfm_alg_alignmask(tfm);
234 if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) {
235 req->base.flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
236 return ablkcipher_walk_done(req, walk, -EINVAL);
239 walk->flags &= ~ABLKCIPHER_WALK_SLOW;
242 bsize = min(walk->blocksize, n);
243 n = scatterwalk_clamp(&walk->in, n);
244 n = scatterwalk_clamp(&walk->out, n);
247 !scatterwalk_aligned(&walk->in, alignmask) ||
248 !scatterwalk_aligned(&walk->out, alignmask)) {
249 err = ablkcipher_next_slow(req, walk, bsize, alignmask,
251 goto set_phys_lowmem;
256 return ablkcipher_next_fast(req, walk);
260 walk->src.page = virt_to_page(src);
261 walk->dst.page = virt_to_page(dst);
262 walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1));
263 walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1));
269 static int ablkcipher_walk_first(struct ablkcipher_request *req,
270 struct ablkcipher_walk *walk)
272 struct crypto_tfm *tfm = req->base.tfm;
273 unsigned int alignmask;
275 alignmask = crypto_tfm_alg_alignmask(tfm);
276 if (WARN_ON_ONCE(in_irq()))
279 walk->iv = req->info;
280 walk->nbytes = walk->total;
281 if (unlikely(!walk->total))
284 walk->iv_buffer = NULL;
285 if (unlikely(((unsigned long)walk->iv & alignmask))) {
286 int err = ablkcipher_copy_iv(walk, tfm, alignmask);
292 scatterwalk_start(&walk->in, walk->in.sg);
293 scatterwalk_start(&walk->out, walk->out.sg);
295 return ablkcipher_walk_next(req, walk);
298 int ablkcipher_walk_phys(struct ablkcipher_request *req,
299 struct ablkcipher_walk *walk)
301 walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm);
302 return ablkcipher_walk_first(req, walk);
304 EXPORT_SYMBOL_GPL(ablkcipher_walk_phys);
306 static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key,
309 struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
310 unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
312 u8 *buffer, *alignbuffer;
313 unsigned long absize;
315 absize = keylen + alignmask;
316 buffer = kmalloc(absize, GFP_ATOMIC);
320 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
321 memcpy(alignbuffer, key, keylen);
322 ret = cipher->setkey(tfm, alignbuffer, keylen);
323 memset(alignbuffer, 0, keylen);
328 static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
331 struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
332 unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
334 if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
335 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
339 if ((unsigned long)key & alignmask)
340 return setkey_unaligned(tfm, key, keylen);
342 return cipher->setkey(tfm, key, keylen);
345 static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
348 return alg->cra_ctxsize;
351 int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req)
353 return crypto_ablkcipher_encrypt(&req->creq);
356 int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req)
358 return crypto_ablkcipher_decrypt(&req->creq);
361 static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
364 struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
365 struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
367 if (alg->ivsize > PAGE_SIZE / 8)
370 crt->setkey = setkey;
371 crt->encrypt = alg->encrypt;
372 crt->decrypt = alg->decrypt;
374 crt->givencrypt = skcipher_null_givencrypt;
375 crt->givdecrypt = skcipher_null_givdecrypt;
377 crt->base = __crypto_ablkcipher_cast(tfm);
378 crt->ivsize = alg->ivsize;
384 static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
386 struct crypto_report_blkcipher rblkcipher;
388 strncpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type));
389 strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>",
390 sizeof(rblkcipher.geniv));
392 rblkcipher.blocksize = alg->cra_blocksize;
393 rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
394 rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
395 rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;
397 if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
398 sizeof(struct crypto_report_blkcipher), &rblkcipher))
399 goto nla_put_failure;
406 static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
412 static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
413 __attribute__ ((unused));
414 static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
416 struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
418 seq_printf(m, "type : ablkcipher\n");
419 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
421 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
422 seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
423 seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
424 seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
425 seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>");
428 const struct crypto_type crypto_ablkcipher_type = {
429 .ctxsize = crypto_ablkcipher_ctxsize,
430 .init = crypto_init_ablkcipher_ops,
431 #ifdef CONFIG_PROC_FS
432 .show = crypto_ablkcipher_show,
434 .report = crypto_ablkcipher_report,
436 EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
438 static int no_givdecrypt(struct skcipher_givcrypt_request *req)
443 static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
446 struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
447 struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
449 if (alg->ivsize > PAGE_SIZE / 8)
452 crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
453 alg->setkey : setkey;
454 crt->encrypt = alg->encrypt;
455 crt->decrypt = alg->decrypt;
456 crt->givencrypt = alg->givencrypt ?: no_givdecrypt;
457 crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
458 crt->base = __crypto_ablkcipher_cast(tfm);
459 crt->ivsize = alg->ivsize;
465 static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
467 struct crypto_report_blkcipher rblkcipher;
469 strncpy(rblkcipher.type, "givcipher", sizeof(rblkcipher.type));
470 strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<built-in>",
471 sizeof(rblkcipher.geniv));
473 rblkcipher.blocksize = alg->cra_blocksize;
474 rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
475 rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
476 rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;
478 if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
479 sizeof(struct crypto_report_blkcipher), &rblkcipher))
480 goto nla_put_failure;
487 static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
493 static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
494 __attribute__ ((unused));
495 static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
497 struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
499 seq_printf(m, "type : givcipher\n");
500 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
502 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
503 seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
504 seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
505 seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
506 seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>");
509 const struct crypto_type crypto_givcipher_type = {
510 .ctxsize = crypto_ablkcipher_ctxsize,
511 .init = crypto_init_givcipher_ops,
512 #ifdef CONFIG_PROC_FS
513 .show = crypto_givcipher_show,
515 .report = crypto_givcipher_report,
517 EXPORT_SYMBOL_GPL(crypto_givcipher_type);
519 const char *crypto_default_geniv(const struct crypto_alg *alg)
521 if (((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
522 CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
523 alg->cra_ablkcipher.ivsize) !=
530 static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask)
532 struct rtattr *tb[3];
535 struct crypto_attr_type data;
539 struct crypto_attr_alg data;
541 struct crypto_template *tmpl;
542 struct crypto_instance *inst;
543 struct crypto_alg *larval;
547 larval = crypto_larval_lookup(alg->cra_driver_name,
548 (type & ~CRYPTO_ALG_TYPE_MASK) |
549 CRYPTO_ALG_TYPE_GIVCIPHER,
550 mask | CRYPTO_ALG_TYPE_MASK);
551 err = PTR_ERR(larval);
556 if (!crypto_is_larval(larval))
559 ptype.attr.rta_len = sizeof(ptype);
560 ptype.attr.rta_type = CRYPTOA_TYPE;
561 ptype.data.type = type | CRYPTO_ALG_GENIV;
562 /* GENIV tells the template that we're making a default geniv. */
563 ptype.data.mask = mask | CRYPTO_ALG_GENIV;
566 palg.attr.rta_len = sizeof(palg);
567 palg.attr.rta_type = CRYPTOA_ALG;
568 /* Must use the exact name to locate ourselves. */
569 memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
574 if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
575 CRYPTO_ALG_TYPE_BLKCIPHER)
576 geniv = alg->cra_blkcipher.geniv;
578 geniv = alg->cra_ablkcipher.geniv;
581 geniv = crypto_default_geniv(alg);
583 tmpl = crypto_lookup_template(geniv);
589 err = tmpl->create(tmpl, tb);
595 inst = tmpl->alloc(tb);
600 err = crypto_register_instance(tmpl, inst);
607 /* Redo the lookup to use the instance we just registered. */
611 crypto_tmpl_put(tmpl);
613 crypto_larval_kill(larval);
615 crypto_mod_put(larval);
621 struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type, u32 mask)
623 struct crypto_alg *alg;
625 alg = crypto_alg_mod_lookup(name, type, mask);
629 if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
630 CRYPTO_ALG_TYPE_GIVCIPHER)
633 if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
634 CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
635 alg->cra_ablkcipher.ivsize))
639 alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,
640 mask & ~CRYPTO_ALG_TESTED);
644 if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
645 CRYPTO_ALG_TYPE_GIVCIPHER) {
646 if (~alg->cra_flags & (type ^ ~mask) & CRYPTO_ALG_TESTED) {
648 alg = ERR_PTR(-ENOENT);
653 BUG_ON(!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
654 CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
655 alg->cra_ablkcipher.ivsize));
657 return ERR_PTR(crypto_givcipher_default(alg, type, mask));
659 EXPORT_SYMBOL_GPL(crypto_lookup_skcipher);
661 int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
664 struct crypto_alg *alg;
667 type = crypto_skcipher_type(type);
668 mask = crypto_skcipher_mask(mask);
670 alg = crypto_lookup_skcipher(name, type, mask);
674 err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
678 EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
680 struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name,
683 struct crypto_tfm *tfm;
686 type = crypto_skcipher_type(type);
687 mask = crypto_skcipher_mask(mask);
690 struct crypto_alg *alg;
692 alg = crypto_lookup_skcipher(alg_name, type, mask);
698 tfm = __crypto_alloc_tfm(alg, type, mask);
700 return __crypto_ablkcipher_cast(tfm);
708 if (fatal_signal_pending(current)) {
716 EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher);