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Merge 4.4.68 into android-4.4
[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / crypto / blkcipher.c
CommitLineData
5cde0af2
HX		 1/*
2 * Block chaining cipher operations.
3 *
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.
7 *
8 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
9 *
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)
13 * any later version.
14 *
15 */
16
d1a2fd50 17#include <crypto/aead.h>
ecfc4329 18#include <crypto/internal/skcipher.h>
42c271c6 19#include <crypto/scatterwalk.h>
5cde0af2 20#include <linux/errno.h>
fb469840 21#include <linux/hardirq.h>
5cde0af2 22#include <linux/kernel.h>
5cde0af2
HX		 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>
50496a1f
SK		 28#include <linux/cryptouser.h>
29#include <net/netlink.h>
5cde0af2
HX		 30
31#include "internal.h"
5cde0af2
HX		 32
33enum {
34 BLKCIPHER_WALK_PHYS = 1 << 0,
35 BLKCIPHER_WALK_SLOW = 1 << 1,
36 BLKCIPHER_WALK_COPY = 1 << 2,
37 BLKCIPHER_WALK_DIFF = 1 << 3,
38};
39
40static int blkcipher_walk_next(struct blkcipher_desc *desc,
41 struct blkcipher_walk *walk);
42static int blkcipher_walk_first(struct blkcipher_desc *desc,
43 struct blkcipher_walk *walk);
44
45static inline void blkcipher_map_src(struct blkcipher_walk *walk)
46{
f0dfc0b0 47 walk->src.virt.addr = scatterwalk_map(&walk->in);
5cde0af2
HX		 48}
49
50static inline void blkcipher_map_dst(struct blkcipher_walk *walk)
51{
f0dfc0b0 52 walk->dst.virt.addr = scatterwalk_map(&walk->out);
5cde0af2
HX		 53}
54
55static inline void blkcipher_unmap_src(struct blkcipher_walk *walk)
56{
f0dfc0b0 57 scatterwalk_unmap(walk->src.virt.addr);
5cde0af2
HX		 58}
59
60static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk)
61{
f0dfc0b0 62 scatterwalk_unmap(walk->dst.virt.addr);
5cde0af2
HX		 63}
64
e4630f9f
HX		 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.
67 */
5cde0af2
HX		 68static inline u8 *blkcipher_get_spot(u8 *start, unsigned int len)
69{
e4630f9f 70 u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
5aaff0c8 71 return max(start, end_page);
5cde0af2
HX		 72}
73
822be00f 74static inline unsigned int blkcipher_done_slow(struct blkcipher_walk *walk,
5cde0af2
HX		 75 unsigned int bsize)
76{
77 u8 *addr;
5cde0af2 78
822be00f 79 addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
5cde0af2
HX		 80 addr = blkcipher_get_spot(addr, bsize);
81 scatterwalk_copychunks(addr, &walk->out, bsize, 1);
82 return bsize;
83}
84
85static inline unsigned int blkcipher_done_fast(struct blkcipher_walk *walk,
86 unsigned int n)
87{
5cde0af2
HX		 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)) {
5cde0af2
HX		 93 if (walk->flags & BLKCIPHER_WALK_DIFF)
94 blkcipher_unmap_dst(walk);
61ecdb80 95 blkcipher_unmap_src(walk);
5cde0af2
HX		 96 }
97
98 scatterwalk_advance(&walk->in, n);
99 scatterwalk_advance(&walk->out, n);
100
101 return n;
102}
103
104int blkcipher_walk_done(struct blkcipher_desc *desc,
105 struct blkcipher_walk *walk, int err)
106{
5cde0af2
HX		 107 unsigned int nbytes = 0;
108
109 if (likely(err >= 0)) {
7607bd8f 110 unsigned int n = walk->nbytes - err;
5cde0af2
HX		 111
112 if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW)))
7607bd8f
HX		 113 n = blkcipher_done_fast(walk, n);
114 else if (WARN_ON(err)) {
115 err = -EINVAL;
116 goto err;
117 } else
822be00f 118 n = blkcipher_done_slow(walk, n);
5cde0af2
HX		 119
120 nbytes = walk->total - n;
121 err = 0;
122 }
123
124 scatterwalk_done(&walk->in, 0, nbytes);
125 scatterwalk_done(&walk->out, 1, nbytes);
126
bac1b5c4 127err:
5cde0af2
HX		 128 walk->total = nbytes;
129 walk->nbytes = nbytes;
130
131 if (nbytes) {
132 crypto_yield(desc->flags);
133 return blkcipher_walk_next(desc, walk);
134 }
135
136 if (walk->iv != desc->info)
822be00f 137 memcpy(desc->info, walk->iv, walk->ivsize);
5cde0af2
HX		 138 if (walk->buffer != walk->page)
139 kfree(walk->buffer);
140 if (walk->page)
141 free_page((unsigned long)walk->page);
142
143 return err;
144}
145EXPORT_SYMBOL_GPL(blkcipher_walk_done);
146
147static inline int blkcipher_next_slow(struct blkcipher_desc *desc,
148 struct blkcipher_walk *walk,
149 unsigned int bsize,
150 unsigned int alignmask)
151{
152 unsigned int n;
70613783 153 unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
5cde0af2
HX		 154
155 if (walk->buffer)
156 goto ok;
157
158 walk->buffer = walk->page;
159 if (walk->buffer)
160 goto ok;
161
2614de1b 162 n = aligned_bsize * 3 - (alignmask + 1) +
e4630f9f 163 (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
5cde0af2
HX		 164 walk->buffer = kmalloc(n, GFP_ATOMIC);
165 if (!walk->buffer)
166 return blkcipher_walk_done(desc, walk, -ENOMEM);
167
168ok:
169 walk->dst.virt.addr = (u8 *)ALIGN((unsigned long)walk->buffer,
170 alignmask + 1);
171 walk->dst.virt.addr = blkcipher_get_spot(walk->dst.virt.addr, bsize);
70613783
HX		 172 walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr +
173 aligned_bsize, bsize);
5cde0af2
HX		 174
175 scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0);
176
177 walk->nbytes = bsize;
178 walk->flags |= BLKCIPHER_WALK_SLOW;
179
180 return 0;
181}
182
183static inline int blkcipher_next_copy(struct blkcipher_walk *walk)
184{
185 u8 *tmp = walk->page;
186
187 blkcipher_map_src(walk);
188 memcpy(tmp, walk->src.virt.addr, walk->nbytes);
189 blkcipher_unmap_src(walk);
190
191 walk->src.virt.addr = tmp;
192 walk->dst.virt.addr = tmp;
193
194 return 0;
195}
196
197static inline int blkcipher_next_fast(struct blkcipher_desc *desc,
198 struct blkcipher_walk *walk)
199{
200 unsigned long diff;
201
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);
206
207 if (walk->flags & BLKCIPHER_WALK_PHYS)
208 return 0;
209
210 diff = walk->src.phys.offset - walk->dst.phys.offset;
211 diff |= walk->src.virt.page - walk->dst.virt.page;
212
213 blkcipher_map_src(walk);
214 walk->dst.virt.addr = walk->src.virt.addr;
215
216 if (diff) {
217 walk->flags |= BLKCIPHER_WALK_DIFF;
218 blkcipher_map_dst(walk);
219 }
220
221 return 0;
222}
223
224static int blkcipher_walk_next(struct blkcipher_desc *desc,
225 struct blkcipher_walk *walk)
226{
7607bd8f 227 unsigned int bsize;
5cde0af2
HX		 228 unsigned int n;
229 int err;
230
231 n = walk->total;
822be00f 232 if (unlikely(n < walk->cipher_blocksize)) {
5cde0af2
HX		 233 desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
234 return blkcipher_walk_done(desc, walk, -EINVAL);
235 }
236
1c95a8a4
HX		 237 bsize = min(walk->walk_blocksize, n);
238
5cde0af2
HX		 239 walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY |
240 BLKCIPHER_WALK_DIFF);
822be00f
AB		 241 if (!scatterwalk_aligned(&walk->in, walk->alignmask) ||
242 !scatterwalk_aligned(&walk->out, walk->alignmask)) {
5cde0af2
HX		 243 walk->flags |= BLKCIPHER_WALK_COPY;
244 if (!walk->page) {
245 walk->page = (void *)__get_free_page(GFP_ATOMIC);
246 if (!walk->page)
247 n = 0;
248 }
249 }
250
251 n = scatterwalk_clamp(&walk->in, n);
252 n = scatterwalk_clamp(&walk->out, n);
253
254 if (unlikely(n < bsize)) {
822be00f 255 err = blkcipher_next_slow(desc, walk, bsize, walk->alignmask);
5cde0af2
HX		 256 goto set_phys_lowmem;
257 }
258
259 walk->nbytes = n;
260 if (walk->flags & BLKCIPHER_WALK_COPY) {
261 err = blkcipher_next_copy(walk);
262 goto set_phys_lowmem;
263 }
264
265 return blkcipher_next_fast(desc, walk);
266
267set_phys_lowmem:
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;
273 }
274 return err;
275}
276
822be00f 277static inline int blkcipher_copy_iv(struct blkcipher_walk *walk)
5cde0af2 278{
822be00f
AB		 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);
5cde0af2
HX		 284 u8 *iv;
285
822be00f 286 size += walk->alignmask & ~(crypto_tfm_ctx_alignment() - 1);
5cde0af2
HX		 287 walk->buffer = kmalloc(size, GFP_ATOMIC);
288 if (!walk->buffer)
289 return -ENOMEM;
290
822be00f 291 iv = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
70613783
HX		 292 iv = blkcipher_get_spot(iv, bs) + aligned_bs;
293 iv = blkcipher_get_spot(iv, bs) + aligned_bs;
822be00f 294 iv = blkcipher_get_spot(iv, walk->ivsize);
5cde0af2 295
822be00f 296 walk->iv = memcpy(iv, walk->iv, walk->ivsize);
5cde0af2
HX		 297 return 0;
298}
299
300int blkcipher_walk_virt(struct blkcipher_desc *desc,
301 struct blkcipher_walk *walk)
302{
303 walk->flags &= ~BLKCIPHER_WALK_PHYS;
822be00f
AB		 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);
5cde0af2
HX		 308 return blkcipher_walk_first(desc, walk);
309}
310EXPORT_SYMBOL_GPL(blkcipher_walk_virt);
311
312int blkcipher_walk_phys(struct blkcipher_desc *desc,
313 struct blkcipher_walk *walk)
314{
315 walk->flags |= BLKCIPHER_WALK_PHYS;
822be00f
AB		 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);
5cde0af2
HX		 320 return blkcipher_walk_first(desc, walk);
321}
322EXPORT_SYMBOL_GPL(blkcipher_walk_phys);
323
324static int blkcipher_walk_first(struct blkcipher_desc *desc,
325 struct blkcipher_walk *walk)
326{
fb469840
HX		 327 if (WARN_ON_ONCE(in_irq()))
328 return -EDEADLK;
329
70d906bc 330 walk->iv = desc->info;
5cde0af2
HX		 331 walk->nbytes = walk->total;
332 if (unlikely(!walk->total))
333 return 0;
334
335 walk->buffer = NULL;
822be00f
AB		 336 if (unlikely(((unsigned long)walk->iv & walk->alignmask))) {
337 int err = blkcipher_copy_iv(walk);
5cde0af2
HX		 338 if (err)
339 return err;
340 }
341
342 scatterwalk_start(&walk->in, walk->in.sg);
343 scatterwalk_start(&walk->out, walk->out.sg);
344 walk->page = NULL;
345
346 return blkcipher_walk_next(desc, walk);
347}
348
7607bd8f
HX		 349int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
350 struct blkcipher_walk *walk,
351 unsigned int blocksize)
352{
353 walk->flags &= ~BLKCIPHER_WALK_PHYS;
822be00f
AB		 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);
7607bd8f
HX		 358 return blkcipher_walk_first(desc, walk);
359}
360EXPORT_SYMBOL_GPL(blkcipher_walk_virt_block);
361
4f7f1d7c
AB		 362int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc,
363 struct blkcipher_walk *walk,
364 struct crypto_aead *tfm,
365 unsigned int blocksize)
366{
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);
373}
374EXPORT_SYMBOL_GPL(blkcipher_aead_walk_virt_block);
375
93867d9b
EB		 376/*
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...)
383 */
384int blkcipher_ablkcipher_walk_virt(struct blkcipher_desc *desc,
385 struct blkcipher_walk *walk,
386 struct crypto_ablkcipher *tfm)
387{
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);
394}
395EXPORT_SYMBOL_GPL(blkcipher_ablkcipher_walk_virt);
396
791b4d5f
HX		 397static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key,
398 unsigned int keylen)
ca7c3938
SS		 399{
400 struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
401 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
402 int ret;
403 u8 *buffer, *alignbuffer;
404 unsigned long absize;
405
406 absize = keylen + alignmask;
407 buffer = kmalloc(absize, GFP_ATOMIC);
408 if (!buffer)
409 return -ENOMEM;
410
411 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
412 memcpy(alignbuffer, key, keylen);
413 ret = cipher->setkey(tfm, alignbuffer, keylen);
06817176 414 memset(alignbuffer, 0, keylen);
ca7c3938
SS		 415 kfree(buffer);
416 return ret;
417}
418
791b4d5f 419static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
5cde0af2
HX		 420{
421 struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
ca7c3938 422 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
5cde0af2
HX		 423
424 if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
425 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
426 return -EINVAL;
427 }
428
ca7c3938
SS		 429 if ((unsigned long)key & alignmask)
430 return setkey_unaligned(tfm, key, keylen);
431
5cde0af2
HX		 432 return cipher->setkey(tfm, key, keylen);
433}
434
32e3983f
HX		 435static int async_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
436 unsigned int keylen)
437{
438 return setkey(crypto_ablkcipher_tfm(tfm), key, keylen);
439}
440
441static int async_encrypt(struct ablkcipher_request *req)
442{
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),
447 .info = req->info,
448 .flags = req->base.flags,
449 };
450
451
452 return alg->encrypt(&desc, req->dst, req->src, req->nbytes);
453}
454
455static int async_decrypt(struct ablkcipher_request *req)
456{
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),
461 .info = req->info,
462 .flags = req->base.flags,
463 };
464
465 return alg->decrypt(&desc, req->dst, req->src, req->nbytes);
466}
467
27d2a330
HX		 468static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type,
469 u32 mask)
5cde0af2
HX		 470{
471 struct blkcipher_alg *cipher = &alg->cra_blkcipher;
472 unsigned int len = alg->cra_ctxsize;
473
332f8840
HX		 474 if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK &&
475 cipher->ivsize) {
5cde0af2
HX		 476 len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
477 len += cipher->ivsize;
478 }
479
480 return len;
481}
482
32e3983f
HX		 483static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm)
484{
485 struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
486 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
487
488 crt->setkey = async_setkey;
489 crt->encrypt = async_encrypt;
490 crt->decrypt = async_decrypt;
b9c55aa4
HX		 491 if (!alg->ivsize) {
492 crt->givencrypt = skcipher_null_givencrypt;
493 crt->givdecrypt = skcipher_null_givdecrypt;
494 }
ecfc4329 495 crt->base = __crypto_ablkcipher_cast(tfm);
32e3983f
HX		 496 crt->ivsize = alg->ivsize;
497
498 return 0;
499}
500
501static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm)
5cde0af2
HX		 502{
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;
506 unsigned long addr;
507
5cde0af2
HX		 508 crt->setkey = setkey;
509 crt->encrypt = alg->encrypt;
510 crt->decrypt = alg->decrypt;
511
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;
516
517 return 0;
518}
519
32e3983f
HX		 520static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
521{
522 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
523
524 if (alg->ivsize > PAGE_SIZE / 8)
525 return -EINVAL;
526
332f8840 527 if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK)
32e3983f
HX		 528 return crypto_init_blkcipher_ops_sync(tfm);
529 else
530 return crypto_init_blkcipher_ops_async(tfm);
531}
532
3acc8473 533#ifdef CONFIG_NET
50496a1f
SK		 534static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
535{
536 struct crypto_report_blkcipher rblkcipher;
537
9a5467bf
MK		 538 strncpy(rblkcipher.type, "blkcipher", sizeof(rblkcipher.type));
539 strncpy(rblkcipher.geniv, alg->cra_blkcipher.geniv ?: "<default>",
540 sizeof(rblkcipher.geniv));
50496a1f
SK		 541
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;
546
6662df33
DM		 547 if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
548 sizeof(struct crypto_report_blkcipher), &rblkcipher))
549 goto nla_put_failure;
50496a1f
SK		 550 return 0;
551
552nla_put_failure:
553 return -EMSGSIZE;
554}
3acc8473
HX		 555#else
556static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
557{
558 return -ENOSYS;
559}
560#endif
50496a1f 561
5cde0af2 562static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
03f5d8ce 563 __attribute__ ((unused));
5cde0af2
HX		 564static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
565{
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);
23508e11
HX		 571 seq_printf(m, "geniv : %s\n", alg->cra_blkcipher.geniv ?:
572 "<default>");
5cde0af2
HX		 573}
574
575const 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,
580#endif
50496a1f 581 .report = crypto_blkcipher_report,
5cde0af2
HX		 582};
583EXPORT_SYMBOL_GPL(crypto_blkcipher_type);
584
ecfc4329
HX		 585static int crypto_grab_nivcipher(struct crypto_skcipher_spawn *spawn,
586 const char *name, u32 type, u32 mask)
587{
588 struct crypto_alg *alg;
589 int err;
590
591 type = crypto_skcipher_type(type);
b170a137 592 mask = crypto_skcipher_mask(mask)| CRYPTO_ALG_GENIV;
ecfc4329
HX		 593
594 alg = crypto_alg_mod_lookup(name, type, mask);
595 if (IS_ERR(alg))
596 return PTR_ERR(alg);
597
598 err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
599 crypto_mod_put(alg);
600 return err;
601}
602
603struct crypto_instance *skcipher_geniv_alloc(struct crypto_template *tmpl,
604 struct rtattr **tb, u32 type,
605 u32 mask)
606{
607 struct {
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);
612
613 unsigned int min_keysize;
614 unsigned int max_keysize;
615 unsigned int ivsize;
616
617 const char *geniv;
618 } balg;
619 const char *name;
620 struct crypto_skcipher_spawn *spawn;
621 struct crypto_attr_type *algt;
622 struct crypto_instance *inst;
623 struct crypto_alg *alg;
624 int err;
625
626 algt = crypto_get_attr_type(tb);
ecfc4329 627 if (IS_ERR(algt))
3e8afe35 628 return ERR_CAST(algt);
ecfc4329
HX		 629
630 if ((algt->type ^ (CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV)) &
631 algt->mask)
632 return ERR_PTR(-EINVAL);
633
634 name = crypto_attr_alg_name(tb[1]);
ecfc4329 635 if (IS_ERR(name))
3e8afe35 636 return ERR_CAST(name);
ecfc4329
HX		 637
638 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
639 if (!inst)
640 return ERR_PTR(-ENOMEM);
641
642 spawn = crypto_instance_ctx(inst);
643
644 /* Ignore async algorithms if necessary. */
645 mask |= crypto_requires_sync(algt->type, algt->mask);
646
647 crypto_set_skcipher_spawn(spawn, inst);
648 err = crypto_grab_nivcipher(spawn, name, type, mask);
649 if (err)
650 goto err_free_inst;
651
652 alg = crypto_skcipher_spawn_alg(spawn);
653
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;
659
660 balg.setkey = async_setkey;
661 balg.encrypt = async_encrypt;
662 balg.decrypt = async_decrypt;
663
664 balg.geniv = alg->cra_blkcipher.geniv;
665 } else {
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;
669
670 balg.setkey = alg->cra_ablkcipher.setkey;
671 balg.encrypt = alg->cra_ablkcipher.encrypt;
672 balg.decrypt = alg->cra_ablkcipher.decrypt;
673
674 balg.geniv = alg->cra_ablkcipher.geniv;
675 }
676
677 err = -EINVAL;
678 if (!balg.ivsize)
679 goto err_drop_alg;
680
681 /*
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.
685 */
686 if (algt->mask & CRYPTO_ALG_GENIV) {
687 if (!balg.geniv)
688 balg.geniv = crypto_default_geniv(alg);
689 err = -EAGAIN;
690 if (strcmp(tmpl->name, balg.geniv))
691 goto err_drop_alg;
692
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);
696 } else {
697 err = -ENAMETOOLONG;
698 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
699 "%s(%s)", tmpl->name, alg->cra_name) >=
700 CRYPTO_MAX_ALG_NAME)
701 goto err_drop_alg;
702 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
703 "%s(%s)", tmpl->name, alg->cra_driver_name) >=
704 CRYPTO_MAX_ALG_NAME)
705 goto err_drop_alg;
706 }
707
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;
714
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;
719
720 inst->alg.cra_ablkcipher.setkey = balg.setkey;
721 inst->alg.cra_ablkcipher.encrypt = balg.encrypt;
722 inst->alg.cra_ablkcipher.decrypt = balg.decrypt;
723
724out:
725 return inst;
726
727err_drop_alg:
728 crypto_drop_skcipher(spawn);
729err_free_inst:
730 kfree(inst);
731 inst = ERR_PTR(err);
732 goto out;
733}
734EXPORT_SYMBOL_GPL(skcipher_geniv_alloc);
735
736void skcipher_geniv_free(struct crypto_instance *inst)
737{
738 crypto_drop_skcipher(crypto_instance_ctx(inst));
739 kfree(inst);
740}
741EXPORT_SYMBOL_GPL(skcipher_geniv_free);
742
743int skcipher_geniv_init(struct crypto_tfm *tfm)
744{
745 struct crypto_instance *inst = (void *)tfm->__crt_alg;
746 struct crypto_ablkcipher *cipher;
747
748 cipher = crypto_spawn_skcipher(crypto_instance_ctx(inst));
749 if (IS_ERR(cipher))
750 return PTR_ERR(cipher);
751
752 tfm->crt_ablkcipher.base = cipher;
753 tfm->crt_ablkcipher.reqsize += crypto_ablkcipher_reqsize(cipher);
754
755 return 0;
756}
757EXPORT_SYMBOL_GPL(skcipher_geniv_init);
758
759void skcipher_geniv_exit(struct crypto_tfm *tfm)
760{
761 crypto_free_ablkcipher(tfm->crt_ablkcipher.base);
762}
763EXPORT_SYMBOL_GPL(skcipher_geniv_exit);
764
5cde0af2
HX		 765MODULE_LICENSE("GPL");
766MODULE_DESCRIPTION("Generic block chaining cipher type");