2 * Block chaining cipher operations.
4 * Generic encrypt/decrypt wrapper for ciphers, handles operations across
5 * multiple page boundaries by using temporary blocks. In user context,
6 * the kernel is given a chance to schedule us once per page.
8 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the Free
12 * Software Foundation; either version 2 of the License, or (at your option)
17 #include <crypto/aead.h>
18 #include <crypto/internal/skcipher.h>
19 #include <crypto/scatterwalk.h>
20 #include <linux/errno.h>
21 #include <linux/hardirq.h>
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/scatterlist.h>
25 #include <linux/seq_file.h>
26 #include <linux/slab.h>
27 #include <linux/string.h>
28 #include <linux/cryptouser.h>
29 #include <net/netlink.h>
34 BLKCIPHER_WALK_PHYS = 1 << 0,
35 BLKCIPHER_WALK_SLOW = 1 << 1,
36 BLKCIPHER_WALK_COPY = 1 << 2,
37 BLKCIPHER_WALK_DIFF = 1 << 3,
40 static int blkcipher_walk_next(struct blkcipher_desc *desc,
41 struct blkcipher_walk *walk);
42 static int blkcipher_walk_first(struct blkcipher_desc *desc,
43 struct blkcipher_walk *walk);
45 static inline void blkcipher_map_src(struct blkcipher_walk *walk)
47 walk->src.virt.addr = scatterwalk_map(&walk->in);
50 static inline void blkcipher_map_dst(struct blkcipher_walk *walk)
52 walk->dst.virt.addr = scatterwalk_map(&walk->out);
55 static inline void blkcipher_unmap_src(struct blkcipher_walk *walk)
57 scatterwalk_unmap(walk->src.virt.addr);
60 static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk)
62 scatterwalk_unmap(walk->dst.virt.addr);
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 *blkcipher_get_spot(u8 *start, unsigned int len)
70 u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
71 return max(start, end_page);
74 static inline unsigned int blkcipher_done_slow(struct blkcipher_walk *walk,
79 addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
80 addr = blkcipher_get_spot(addr, bsize);
81 scatterwalk_copychunks(addr, &walk->out, bsize, 1);
85 static inline unsigned int blkcipher_done_fast(struct blkcipher_walk *walk,
88 if (walk->flags & BLKCIPHER_WALK_COPY) {
89 blkcipher_map_dst(walk);
90 memcpy(walk->dst.virt.addr, walk->page, n);
91 blkcipher_unmap_dst(walk);
92 } else if (!(walk->flags & BLKCIPHER_WALK_PHYS)) {
93 if (walk->flags & BLKCIPHER_WALK_DIFF)
94 blkcipher_unmap_dst(walk);
95 blkcipher_unmap_src(walk);
98 scatterwalk_advance(&walk->in, n);
99 scatterwalk_advance(&walk->out, n);
104 int blkcipher_walk_done(struct blkcipher_desc *desc,
105 struct blkcipher_walk *walk, int err)
107 unsigned int nbytes = 0;
109 if (likely(err >= 0)) {
110 unsigned int n = walk->nbytes - err;
112 if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW)))
113 n = blkcipher_done_fast(walk, n);
114 else if (WARN_ON(err)) {
118 n = blkcipher_done_slow(walk, n);
120 nbytes = walk->total - n;
124 scatterwalk_done(&walk->in, 0, nbytes);
125 scatterwalk_done(&walk->out, 1, nbytes);
128 walk->total = nbytes;
129 walk->nbytes = nbytes;
132 crypto_yield(desc->flags);
133 return blkcipher_walk_next(desc, walk);
136 if (walk->iv != desc->info)
137 memcpy(desc->info, walk->iv, walk->ivsize);
138 if (walk->buffer != walk->page)
141 free_page((unsigned long)walk->page);
145 EXPORT_SYMBOL_GPL(blkcipher_walk_done);
147 static inline int blkcipher_next_slow(struct blkcipher_desc *desc,
148 struct blkcipher_walk *walk,
150 unsigned int alignmask)
153 unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
158 walk->buffer = walk->page;
162 n = aligned_bsize * 3 - (alignmask + 1) +
163 (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
164 walk->buffer = kmalloc(n, GFP_ATOMIC);
166 return blkcipher_walk_done(desc, walk, -ENOMEM);
169 walk->dst.virt.addr = (u8 *)ALIGN((unsigned long)walk->buffer,
171 walk->dst.virt.addr = blkcipher_get_spot(walk->dst.virt.addr, bsize);
172 walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr +
173 aligned_bsize, bsize);
175 scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0);
177 walk->nbytes = bsize;
178 walk->flags |= BLKCIPHER_WALK_SLOW;
183 static inline int blkcipher_next_copy(struct blkcipher_walk *walk)
185 u8 *tmp = walk->page;
187 blkcipher_map_src(walk);
188 memcpy(tmp, walk->src.virt.addr, walk->nbytes);
189 blkcipher_unmap_src(walk);
191 walk->src.virt.addr = tmp;
192 walk->dst.virt.addr = tmp;
197 static inline int blkcipher_next_fast(struct blkcipher_desc *desc,
198 struct blkcipher_walk *walk)
202 walk->src.phys.page = scatterwalk_page(&walk->in);
203 walk->src.phys.offset = offset_in_page(walk->in.offset);
204 walk->dst.phys.page = scatterwalk_page(&walk->out);
205 walk->dst.phys.offset = offset_in_page(walk->out.offset);
207 if (walk->flags & BLKCIPHER_WALK_PHYS)
210 diff = walk->src.phys.offset - walk->dst.phys.offset;
211 diff |= walk->src.virt.page - walk->dst.virt.page;
213 blkcipher_map_src(walk);
214 walk->dst.virt.addr = walk->src.virt.addr;
217 walk->flags |= BLKCIPHER_WALK_DIFF;
218 blkcipher_map_dst(walk);
224 static int blkcipher_walk_next(struct blkcipher_desc *desc,
225 struct blkcipher_walk *walk)
232 if (unlikely(n < walk->cipher_blocksize)) {
233 desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
234 return blkcipher_walk_done(desc, walk, -EINVAL);
237 bsize = min(walk->walk_blocksize, n);
239 walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY |
240 BLKCIPHER_WALK_DIFF);
241 if (!scatterwalk_aligned(&walk->in, walk->alignmask) ||
242 !scatterwalk_aligned(&walk->out, walk->alignmask)) {
243 walk->flags |= BLKCIPHER_WALK_COPY;
245 walk->page = (void *)__get_free_page(GFP_ATOMIC);
251 n = scatterwalk_clamp(&walk->in, n);
252 n = scatterwalk_clamp(&walk->out, n);
254 if (unlikely(n < bsize)) {
255 err = blkcipher_next_slow(desc, walk, bsize, walk->alignmask);
256 goto set_phys_lowmem;
260 if (walk->flags & BLKCIPHER_WALK_COPY) {
261 err = blkcipher_next_copy(walk);
262 goto set_phys_lowmem;
265 return blkcipher_next_fast(desc, walk);
268 if (walk->flags & BLKCIPHER_WALK_PHYS) {
269 walk->src.phys.page = virt_to_page(walk->src.virt.addr);
270 walk->dst.phys.page = virt_to_page(walk->dst.virt.addr);
271 walk->src.phys.offset &= PAGE_SIZE - 1;
272 walk->dst.phys.offset &= PAGE_SIZE - 1;
277 static inline int blkcipher_copy_iv(struct blkcipher_walk *walk)
279 unsigned bs = walk->walk_blocksize;
280 unsigned aligned_bs = ALIGN(bs, walk->alignmask + 1);
281 unsigned int size = aligned_bs * 2 +
282 walk->ivsize + max(aligned_bs, walk->ivsize) -
283 (walk->alignmask + 1);
286 size += walk->alignmask & ~(crypto_tfm_ctx_alignment() - 1);
287 walk->buffer = kmalloc(size, GFP_ATOMIC);
291 iv = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
292 iv = blkcipher_get_spot(iv, bs) + aligned_bs;
293 iv = blkcipher_get_spot(iv, bs) + aligned_bs;
294 iv = blkcipher_get_spot(iv, walk->ivsize);
296 walk->iv = memcpy(iv, walk->iv, walk->ivsize);
300 int blkcipher_walk_virt(struct blkcipher_desc *desc,
301 struct blkcipher_walk *walk)
303 walk->flags &= ~BLKCIPHER_WALK_PHYS;
304 walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm);
305 walk->cipher_blocksize = walk->walk_blocksize;
306 walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
307 walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
308 return blkcipher_walk_first(desc, walk);
310 EXPORT_SYMBOL_GPL(blkcipher_walk_virt);
312 int blkcipher_walk_phys(struct blkcipher_desc *desc,
313 struct blkcipher_walk *walk)
315 walk->flags |= BLKCIPHER_WALK_PHYS;
316 walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm);
317 walk->cipher_blocksize = walk->walk_blocksize;
318 walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
319 walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
320 return blkcipher_walk_first(desc, walk);
322 EXPORT_SYMBOL_GPL(blkcipher_walk_phys);
324 static int blkcipher_walk_first(struct blkcipher_desc *desc,
325 struct blkcipher_walk *walk)
327 if (WARN_ON_ONCE(in_irq()))
330 walk->iv = desc->info;
331 walk->nbytes = walk->total;
332 if (unlikely(!walk->total))
336 if (unlikely(((unsigned long)walk->iv & walk->alignmask))) {
337 int err = blkcipher_copy_iv(walk);
342 scatterwalk_start(&walk->in, walk->in.sg);
343 scatterwalk_start(&walk->out, walk->out.sg);
346 return blkcipher_walk_next(desc, walk);
349 int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
350 struct blkcipher_walk *walk,
351 unsigned int blocksize)
353 walk->flags &= ~BLKCIPHER_WALK_PHYS;
354 walk->walk_blocksize = blocksize;
355 walk->cipher_blocksize = crypto_blkcipher_blocksize(desc->tfm);
356 walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
357 walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
358 return blkcipher_walk_first(desc, walk);
360 EXPORT_SYMBOL_GPL(blkcipher_walk_virt_block);
362 int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc,
363 struct blkcipher_walk *walk,
364 struct crypto_aead *tfm,
365 unsigned int blocksize)
367 walk->flags &= ~BLKCIPHER_WALK_PHYS;
368 walk->walk_blocksize = blocksize;
369 walk->cipher_blocksize = crypto_aead_blocksize(tfm);
370 walk->ivsize = crypto_aead_ivsize(tfm);
371 walk->alignmask = crypto_aead_alignmask(tfm);
372 return blkcipher_walk_first(desc, walk);
374 EXPORT_SYMBOL_GPL(blkcipher_aead_walk_virt_block);
377 * This function allows ablkcipher algorithms to use the blkcipher_walk API to
378 * walk over their data. The specified crypto_ablkcipher tfm is used to
379 * initialize the struct blkcipher_walk, and the crypto_blkcipher specified in
380 * desc->tfm is never used so it can be left NULL. (Yes, this design is ugly,
381 * but it parallels blkcipher_aead_walk_virt_block() above. In the 4.10 kernel
382 * this is starting to be cleaned up...)
384 int blkcipher_ablkcipher_walk_virt(struct blkcipher_desc *desc,
385 struct blkcipher_walk *walk,
386 struct crypto_ablkcipher *tfm)
388 walk->flags &= ~BLKCIPHER_WALK_PHYS;
389 walk->walk_blocksize = crypto_ablkcipher_blocksize(tfm);
390 walk->cipher_blocksize = walk->walk_blocksize;
391 walk->ivsize = crypto_ablkcipher_ivsize(tfm);
392 walk->alignmask = crypto_ablkcipher_alignmask(tfm);
393 return blkcipher_walk_first(desc, walk);
395 EXPORT_SYMBOL_GPL(blkcipher_ablkcipher_walk_virt);
397 static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key,
400 struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
401 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
403 u8 *buffer, *alignbuffer;
404 unsigned long absize;
406 absize = keylen + alignmask;
407 buffer = kmalloc(absize, GFP_ATOMIC);
411 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
412 memcpy(alignbuffer, key, keylen);
413 ret = cipher->setkey(tfm, alignbuffer, keylen);
414 memset(alignbuffer, 0, keylen);
419 static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
421 struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
422 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
424 if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
425 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
429 if ((unsigned long)key & alignmask)
430 return setkey_unaligned(tfm, key, keylen);
432 return cipher->setkey(tfm, key, keylen);
435 static int async_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
438 return setkey(crypto_ablkcipher_tfm(tfm), key, keylen);
441 static int async_encrypt(struct ablkcipher_request *req)
443 struct crypto_tfm *tfm = req->base.tfm;
444 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
445 struct blkcipher_desc desc = {
446 .tfm = __crypto_blkcipher_cast(tfm),
448 .flags = req->base.flags,
452 return alg->encrypt(&desc, req->dst, req->src, req->nbytes);
455 static int async_decrypt(struct ablkcipher_request *req)
457 struct crypto_tfm *tfm = req->base.tfm;
458 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
459 struct blkcipher_desc desc = {
460 .tfm = __crypto_blkcipher_cast(tfm),
462 .flags = req->base.flags,
465 return alg->decrypt(&desc, req->dst, req->src, req->nbytes);
468 static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type,
471 struct blkcipher_alg *cipher = &alg->cra_blkcipher;
472 unsigned int len = alg->cra_ctxsize;
474 if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK &&
476 len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
477 len += cipher->ivsize;
483 static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm)
485 struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
486 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
488 crt->setkey = async_setkey;
489 crt->encrypt = async_encrypt;
490 crt->decrypt = async_decrypt;
492 crt->givencrypt = skcipher_null_givencrypt;
493 crt->givdecrypt = skcipher_null_givdecrypt;
495 crt->base = __crypto_ablkcipher_cast(tfm);
496 crt->ivsize = alg->ivsize;
501 static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm)
503 struct blkcipher_tfm *crt = &tfm->crt_blkcipher;
504 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
505 unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1;
508 crt->setkey = setkey;
509 crt->encrypt = alg->encrypt;
510 crt->decrypt = alg->decrypt;
512 addr = (unsigned long)crypto_tfm_ctx(tfm);
513 addr = ALIGN(addr, align);
514 addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align);
515 crt->iv = (void *)addr;
520 static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
522 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
524 if (alg->ivsize > PAGE_SIZE / 8)
527 if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK)
528 return crypto_init_blkcipher_ops_sync(tfm);
530 return crypto_init_blkcipher_ops_async(tfm);
534 static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
536 struct crypto_report_blkcipher rblkcipher;
538 strncpy(rblkcipher.type, "blkcipher", sizeof(rblkcipher.type));
539 strncpy(rblkcipher.geniv, alg->cra_blkcipher.geniv ?: "<default>",
540 sizeof(rblkcipher.geniv));
542 rblkcipher.blocksize = alg->cra_blocksize;
543 rblkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
544 rblkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
545 rblkcipher.ivsize = alg->cra_blkcipher.ivsize;
547 if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
548 sizeof(struct crypto_report_blkcipher), &rblkcipher))
549 goto nla_put_failure;
556 static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
562 static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
563 __attribute__ ((unused));
564 static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
566 seq_printf(m, "type : blkcipher\n");
567 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
568 seq_printf(m, "min keysize : %u\n", alg->cra_blkcipher.min_keysize);
569 seq_printf(m, "max keysize : %u\n", alg->cra_blkcipher.max_keysize);
570 seq_printf(m, "ivsize : %u\n", alg->cra_blkcipher.ivsize);
571 seq_printf(m, "geniv : %s\n", alg->cra_blkcipher.geniv ?:
575 const struct crypto_type crypto_blkcipher_type = {
576 .ctxsize = crypto_blkcipher_ctxsize,
577 .init = crypto_init_blkcipher_ops,
578 #ifdef CONFIG_PROC_FS
579 .show = crypto_blkcipher_show,
581 .report = crypto_blkcipher_report,
583 EXPORT_SYMBOL_GPL(crypto_blkcipher_type);
585 static int crypto_grab_nivcipher(struct crypto_skcipher_spawn *spawn,
586 const char *name, u32 type, u32 mask)
588 struct crypto_alg *alg;
591 type = crypto_skcipher_type(type);
592 mask = crypto_skcipher_mask(mask)| CRYPTO_ALG_GENIV;
594 alg = crypto_alg_mod_lookup(name, type, mask);
598 err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
603 struct crypto_instance *skcipher_geniv_alloc(struct crypto_template *tmpl,
604 struct rtattr **tb, u32 type,
608 int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key,
609 unsigned int keylen);
610 int (*encrypt)(struct ablkcipher_request *req);
611 int (*decrypt)(struct ablkcipher_request *req);
613 unsigned int min_keysize;
614 unsigned int max_keysize;
620 struct crypto_skcipher_spawn *spawn;
621 struct crypto_attr_type *algt;
622 struct crypto_instance *inst;
623 struct crypto_alg *alg;
626 algt = crypto_get_attr_type(tb);
628 return ERR_CAST(algt);
630 if ((algt->type ^ (CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV)) &
632 return ERR_PTR(-EINVAL);
634 name = crypto_attr_alg_name(tb[1]);
636 return ERR_CAST(name);
638 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
640 return ERR_PTR(-ENOMEM);
642 spawn = crypto_instance_ctx(inst);
644 /* Ignore async algorithms if necessary. */
645 mask |= crypto_requires_sync(algt->type, algt->mask);
647 crypto_set_skcipher_spawn(spawn, inst);
648 err = crypto_grab_nivcipher(spawn, name, type, mask);
652 alg = crypto_skcipher_spawn_alg(spawn);
654 if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
655 CRYPTO_ALG_TYPE_BLKCIPHER) {
656 balg.ivsize = alg->cra_blkcipher.ivsize;
657 balg.min_keysize = alg->cra_blkcipher.min_keysize;
658 balg.max_keysize = alg->cra_blkcipher.max_keysize;
660 balg.setkey = async_setkey;
661 balg.encrypt = async_encrypt;
662 balg.decrypt = async_decrypt;
664 balg.geniv = alg->cra_blkcipher.geniv;
666 balg.ivsize = alg->cra_ablkcipher.ivsize;
667 balg.min_keysize = alg->cra_ablkcipher.min_keysize;
668 balg.max_keysize = alg->cra_ablkcipher.max_keysize;
670 balg.setkey = alg->cra_ablkcipher.setkey;
671 balg.encrypt = alg->cra_ablkcipher.encrypt;
672 balg.decrypt = alg->cra_ablkcipher.decrypt;
674 balg.geniv = alg->cra_ablkcipher.geniv;
682 * This is only true if we're constructing an algorithm with its
683 * default IV generator. For the default generator we elide the
684 * template name and double-check the IV generator.
686 if (algt->mask & CRYPTO_ALG_GENIV) {
688 balg.geniv = crypto_default_geniv(alg);
690 if (strcmp(tmpl->name, balg.geniv))
693 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
694 memcpy(inst->alg.cra_driver_name, alg->cra_driver_name,
695 CRYPTO_MAX_ALG_NAME);
698 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
699 "%s(%s)", tmpl->name, alg->cra_name) >=
702 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
703 "%s(%s)", tmpl->name, alg->cra_driver_name) >=
708 inst->alg.cra_flags = CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV;
709 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
710 inst->alg.cra_priority = alg->cra_priority;
711 inst->alg.cra_blocksize = alg->cra_blocksize;
712 inst->alg.cra_alignmask = alg->cra_alignmask;
713 inst->alg.cra_type = &crypto_givcipher_type;
715 inst->alg.cra_ablkcipher.ivsize = balg.ivsize;
716 inst->alg.cra_ablkcipher.min_keysize = balg.min_keysize;
717 inst->alg.cra_ablkcipher.max_keysize = balg.max_keysize;
718 inst->alg.cra_ablkcipher.geniv = balg.geniv;
720 inst->alg.cra_ablkcipher.setkey = balg.setkey;
721 inst->alg.cra_ablkcipher.encrypt = balg.encrypt;
722 inst->alg.cra_ablkcipher.decrypt = balg.decrypt;
728 crypto_drop_skcipher(spawn);
734 EXPORT_SYMBOL_GPL(skcipher_geniv_alloc);
736 void skcipher_geniv_free(struct crypto_instance *inst)
738 crypto_drop_skcipher(crypto_instance_ctx(inst));
741 EXPORT_SYMBOL_GPL(skcipher_geniv_free);
743 int skcipher_geniv_init(struct crypto_tfm *tfm)
745 struct crypto_instance *inst = (void *)tfm->__crt_alg;
746 struct crypto_ablkcipher *cipher;
748 cipher = crypto_spawn_skcipher(crypto_instance_ctx(inst));
750 return PTR_ERR(cipher);
752 tfm->crt_ablkcipher.base = cipher;
753 tfm->crt_ablkcipher.reqsize += crypto_ablkcipher_reqsize(cipher);
757 EXPORT_SYMBOL_GPL(skcipher_geniv_init);
759 void skcipher_geniv_exit(struct crypto_tfm *tfm)
761 crypto_free_ablkcipher(tfm->crt_ablkcipher.base);
763 EXPORT_SYMBOL_GPL(skcipher_geniv_exit);
765 MODULE_LICENSE("GPL");
766 MODULE_DESCRIPTION("Generic block chaining cipher type");