blob: a832426820e8ba5e912324153cea821083cd2b6a [file] [log] [blame]
Herbert Xu5cde0af2006-08-22 00:07:53 +10001/*
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
Herbert Xud1a2fd52015-05-11 17:47:49 +080017#include <crypto/aead.h>
Herbert Xuecfc4322007-12-05 21:08:36 +110018#include <crypto/internal/skcipher.h>
Herbert Xu42c271c2007-12-07 18:52:49 +080019#include <crypto/scatterwalk.h>
Herbert Xu5cde0af2006-08-22 00:07:53 +100020#include <linux/errno.h>
Herbert Xufb469842006-12-10 10:45:28 +110021#include <linux/hardirq.h>
Herbert Xu5cde0af2006-08-22 00:07:53 +100022#include <linux/kernel.h>
Herbert Xu5cde0af2006-08-22 00:07:53 +100023#include <linux/module.h>
Herbert Xu5cde0af2006-08-22 00:07:53 +100024#include <linux/seq_file.h>
25#include <linux/slab.h>
26#include <linux/string.h>
Steffen Klassert50496a12011-09-27 07:41:54 +020027#include <linux/cryptouser.h>
28#include <net/netlink.h>
Herbert Xu5cde0af2006-08-22 00:07:53 +100029
30#include "internal.h"
Herbert Xu5cde0af2006-08-22 00:07:53 +100031
32enum {
33 BLKCIPHER_WALK_PHYS = 1 << 0,
34 BLKCIPHER_WALK_SLOW = 1 << 1,
35 BLKCIPHER_WALK_COPY = 1 << 2,
36 BLKCIPHER_WALK_DIFF = 1 << 3,
37};
38
39static int blkcipher_walk_next(struct blkcipher_desc *desc,
40 struct blkcipher_walk *walk);
41static int blkcipher_walk_first(struct blkcipher_desc *desc,
42 struct blkcipher_walk *walk);
43
44static inline void blkcipher_map_src(struct blkcipher_walk *walk)
45{
Cong Wangf0dfc0b2011-11-25 23:14:17 +080046 walk->src.virt.addr = scatterwalk_map(&walk->in);
Herbert Xu5cde0af2006-08-22 00:07:53 +100047}
48
49static inline void blkcipher_map_dst(struct blkcipher_walk *walk)
50{
Cong Wangf0dfc0b2011-11-25 23:14:17 +080051 walk->dst.virt.addr = scatterwalk_map(&walk->out);
Herbert Xu5cde0af2006-08-22 00:07:53 +100052}
53
54static inline void blkcipher_unmap_src(struct blkcipher_walk *walk)
55{
Cong Wangf0dfc0b2011-11-25 23:14:17 +080056 scatterwalk_unmap(walk->src.virt.addr);
Herbert Xu5cde0af2006-08-22 00:07:53 +100057}
58
59static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk)
60{
Cong Wangf0dfc0b2011-11-25 23:14:17 +080061 scatterwalk_unmap(walk->dst.virt.addr);
Herbert Xu5cde0af2006-08-22 00:07:53 +100062}
63
Herbert Xue4630f92007-09-09 08:45:21 +010064/* Get a spot of the specified length that does not straddle a page.
65 * The caller needs to ensure that there is enough space for this operation.
66 */
Herbert Xu5cde0af2006-08-22 00:07:53 +100067static inline u8 *blkcipher_get_spot(u8 *start, unsigned int len)
68{
Herbert Xue4630f92007-09-09 08:45:21 +010069 u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
Ingo Oeser5aaff0c2007-09-19 19:11:41 +080070 return max(start, end_page);
Herbert Xu5cde0af2006-08-22 00:07:53 +100071}
72
Ard Biesheuvel822be002014-03-04 13:28:38 +080073static inline unsigned int blkcipher_done_slow(struct blkcipher_walk *walk,
Herbert Xu5cde0af2006-08-22 00:07:53 +100074 unsigned int bsize)
75{
76 u8 *addr;
Herbert Xu5cde0af2006-08-22 00:07:53 +100077
Ard Biesheuvel822be002014-03-04 13:28:38 +080078 addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
Herbert Xu5cde0af2006-08-22 00:07:53 +100079 addr = blkcipher_get_spot(addr, bsize);
80 scatterwalk_copychunks(addr, &walk->out, bsize, 1);
81 return bsize;
82}
83
84static inline unsigned int blkcipher_done_fast(struct blkcipher_walk *walk,
85 unsigned int n)
86{
Herbert Xu5cde0af2006-08-22 00:07:53 +100087 if (walk->flags & BLKCIPHER_WALK_COPY) {
88 blkcipher_map_dst(walk);
89 memcpy(walk->dst.virt.addr, walk->page, n);
90 blkcipher_unmap_dst(walk);
91 } else if (!(walk->flags & BLKCIPHER_WALK_PHYS)) {
Herbert Xu5cde0af2006-08-22 00:07:53 +100092 if (walk->flags & BLKCIPHER_WALK_DIFF)
93 blkcipher_unmap_dst(walk);
Peter Zijlstra61ecdb802010-10-26 14:21:47 -070094 blkcipher_unmap_src(walk);
Herbert Xu5cde0af2006-08-22 00:07:53 +100095 }
96
97 scatterwalk_advance(&walk->in, n);
98 scatterwalk_advance(&walk->out, n);
99
100 return n;
101}
102
103int blkcipher_walk_done(struct blkcipher_desc *desc,
104 struct blkcipher_walk *walk, int err)
105{
Herbert Xu5cde0af2006-08-22 00:07:53 +1000106 unsigned int nbytes = 0;
107
108 if (likely(err >= 0)) {
Herbert Xu7607bd82007-10-04 15:24:05 +0800109 unsigned int n = walk->nbytes - err;
Herbert Xu5cde0af2006-08-22 00:07:53 +1000110
111 if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW)))
Herbert Xu7607bd82007-10-04 15:24:05 +0800112 n = blkcipher_done_fast(walk, n);
113 else if (WARN_ON(err)) {
114 err = -EINVAL;
115 goto err;
116 } else
Ard Biesheuvel822be002014-03-04 13:28:38 +0800117 n = blkcipher_done_slow(walk, n);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000118
119 nbytes = walk->total - n;
120 err = 0;
121 }
122
123 scatterwalk_done(&walk->in, 0, nbytes);
124 scatterwalk_done(&walk->out, 1, nbytes);
125
Herbert Xubac1b5c2009-01-16 14:40:54 +1100126err:
Herbert Xu5cde0af2006-08-22 00:07:53 +1000127 walk->total = nbytes;
128 walk->nbytes = nbytes;
129
130 if (nbytes) {
131 crypto_yield(desc->flags);
132 return blkcipher_walk_next(desc, walk);
133 }
134
135 if (walk->iv != desc->info)
Ard Biesheuvel822be002014-03-04 13:28:38 +0800136 memcpy(desc->info, walk->iv, walk->ivsize);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000137 if (walk->buffer != walk->page)
138 kfree(walk->buffer);
139 if (walk->page)
140 free_page((unsigned long)walk->page);
141
142 return err;
143}
144EXPORT_SYMBOL_GPL(blkcipher_walk_done);
145
146static inline int blkcipher_next_slow(struct blkcipher_desc *desc,
147 struct blkcipher_walk *walk,
148 unsigned int bsize,
149 unsigned int alignmask)
150{
151 unsigned int n;
Herbert Xu70613782007-09-29 21:24:23 +0800152 unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000153
154 if (walk->buffer)
155 goto ok;
156
157 walk->buffer = walk->page;
158 if (walk->buffer)
159 goto ok;
160
Herbert Xu2614de12007-10-04 14:49:00 +0800161 n = aligned_bsize * 3 - (alignmask + 1) +
Herbert Xue4630f92007-09-09 08:45:21 +0100162 (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
Herbert Xu5cde0af2006-08-22 00:07:53 +1000163 walk->buffer = kmalloc(n, GFP_ATOMIC);
164 if (!walk->buffer)
165 return blkcipher_walk_done(desc, walk, -ENOMEM);
166
167ok:
168 walk->dst.virt.addr = (u8 *)ALIGN((unsigned long)walk->buffer,
169 alignmask + 1);
170 walk->dst.virt.addr = blkcipher_get_spot(walk->dst.virt.addr, bsize);
Herbert Xu70613782007-09-29 21:24:23 +0800171 walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr +
172 aligned_bsize, bsize);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000173
174 scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0);
175
176 walk->nbytes = bsize;
177 walk->flags |= BLKCIPHER_WALK_SLOW;
178
179 return 0;
180}
181
182static inline int blkcipher_next_copy(struct blkcipher_walk *walk)
183{
184 u8 *tmp = walk->page;
185
186 blkcipher_map_src(walk);
187 memcpy(tmp, walk->src.virt.addr, walk->nbytes);
188 blkcipher_unmap_src(walk);
189
190 walk->src.virt.addr = tmp;
191 walk->dst.virt.addr = tmp;
192
193 return 0;
194}
195
196static inline int blkcipher_next_fast(struct blkcipher_desc *desc,
197 struct blkcipher_walk *walk)
198{
199 unsigned long diff;
200
201 walk->src.phys.page = scatterwalk_page(&walk->in);
202 walk->src.phys.offset = offset_in_page(walk->in.offset);
203 walk->dst.phys.page = scatterwalk_page(&walk->out);
204 walk->dst.phys.offset = offset_in_page(walk->out.offset);
205
206 if (walk->flags & BLKCIPHER_WALK_PHYS)
207 return 0;
208
209 diff = walk->src.phys.offset - walk->dst.phys.offset;
210 diff |= walk->src.virt.page - walk->dst.virt.page;
211
212 blkcipher_map_src(walk);
213 walk->dst.virt.addr = walk->src.virt.addr;
214
215 if (diff) {
216 walk->flags |= BLKCIPHER_WALK_DIFF;
217 blkcipher_map_dst(walk);
218 }
219
220 return 0;
221}
222
223static int blkcipher_walk_next(struct blkcipher_desc *desc,
224 struct blkcipher_walk *walk)
225{
Herbert Xu7607bd82007-10-04 15:24:05 +0800226 unsigned int bsize;
Herbert Xu5cde0af2006-08-22 00:07:53 +1000227 unsigned int n;
228 int err;
229
230 n = walk->total;
Ard Biesheuvel822be002014-03-04 13:28:38 +0800231 if (unlikely(n < walk->cipher_blocksize)) {
Herbert Xu5cde0af2006-08-22 00:07:53 +1000232 desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
233 return blkcipher_walk_done(desc, walk, -EINVAL);
234 }
235
Herbert Xuacdb04d2016-09-13 14:43:29 +0800236 bsize = min(walk->walk_blocksize, n);
237
Herbert Xu5cde0af2006-08-22 00:07:53 +1000238 walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY |
239 BLKCIPHER_WALK_DIFF);
Ard Biesheuvel822be002014-03-04 13:28:38 +0800240 if (!scatterwalk_aligned(&walk->in, walk->alignmask) ||
241 !scatterwalk_aligned(&walk->out, walk->alignmask)) {
Herbert Xu5cde0af2006-08-22 00:07:53 +1000242 walk->flags |= BLKCIPHER_WALK_COPY;
243 if (!walk->page) {
244 walk->page = (void *)__get_free_page(GFP_ATOMIC);
245 if (!walk->page)
246 n = 0;
247 }
248 }
249
250 n = scatterwalk_clamp(&walk->in, n);
251 n = scatterwalk_clamp(&walk->out, n);
252
253 if (unlikely(n < bsize)) {
Ard Biesheuvel822be002014-03-04 13:28:38 +0800254 err = blkcipher_next_slow(desc, walk, bsize, walk->alignmask);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000255 goto set_phys_lowmem;
256 }
257
258 walk->nbytes = n;
259 if (walk->flags & BLKCIPHER_WALK_COPY) {
260 err = blkcipher_next_copy(walk);
261 goto set_phys_lowmem;
262 }
263
264 return blkcipher_next_fast(desc, walk);
265
266set_phys_lowmem:
267 if (walk->flags & BLKCIPHER_WALK_PHYS) {
268 walk->src.phys.page = virt_to_page(walk->src.virt.addr);
269 walk->dst.phys.page = virt_to_page(walk->dst.virt.addr);
270 walk->src.phys.offset &= PAGE_SIZE - 1;
271 walk->dst.phys.offset &= PAGE_SIZE - 1;
272 }
273 return err;
274}
275
Ard Biesheuvel822be002014-03-04 13:28:38 +0800276static inline int blkcipher_copy_iv(struct blkcipher_walk *walk)
Herbert Xu5cde0af2006-08-22 00:07:53 +1000277{
Ard Biesheuvel822be002014-03-04 13:28:38 +0800278 unsigned bs = walk->walk_blocksize;
279 unsigned aligned_bs = ALIGN(bs, walk->alignmask + 1);
280 unsigned int size = aligned_bs * 2 +
281 walk->ivsize + max(aligned_bs, walk->ivsize) -
282 (walk->alignmask + 1);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000283 u8 *iv;
284
Ard Biesheuvel822be002014-03-04 13:28:38 +0800285 size += walk->alignmask & ~(crypto_tfm_ctx_alignment() - 1);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000286 walk->buffer = kmalloc(size, GFP_ATOMIC);
287 if (!walk->buffer)
288 return -ENOMEM;
289
Ard Biesheuvel822be002014-03-04 13:28:38 +0800290 iv = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
Herbert Xu70613782007-09-29 21:24:23 +0800291 iv = blkcipher_get_spot(iv, bs) + aligned_bs;
292 iv = blkcipher_get_spot(iv, bs) + aligned_bs;
Ard Biesheuvel822be002014-03-04 13:28:38 +0800293 iv = blkcipher_get_spot(iv, walk->ivsize);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000294
Ard Biesheuvel822be002014-03-04 13:28:38 +0800295 walk->iv = memcpy(iv, walk->iv, walk->ivsize);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000296 return 0;
297}
298
299int blkcipher_walk_virt(struct blkcipher_desc *desc,
300 struct blkcipher_walk *walk)
301{
302 walk->flags &= ~BLKCIPHER_WALK_PHYS;
Ard Biesheuvel822be002014-03-04 13:28:38 +0800303 walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm);
304 walk->cipher_blocksize = walk->walk_blocksize;
305 walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
306 walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000307 return blkcipher_walk_first(desc, walk);
308}
309EXPORT_SYMBOL_GPL(blkcipher_walk_virt);
310
311int blkcipher_walk_phys(struct blkcipher_desc *desc,
312 struct blkcipher_walk *walk)
313{
314 walk->flags |= BLKCIPHER_WALK_PHYS;
Ard Biesheuvel822be002014-03-04 13:28:38 +0800315 walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm);
316 walk->cipher_blocksize = walk->walk_blocksize;
317 walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
318 walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000319 return blkcipher_walk_first(desc, walk);
320}
321EXPORT_SYMBOL_GPL(blkcipher_walk_phys);
322
323static int blkcipher_walk_first(struct blkcipher_desc *desc,
324 struct blkcipher_walk *walk)
325{
Herbert Xufb469842006-12-10 10:45:28 +1100326 if (WARN_ON_ONCE(in_irq()))
327 return -EDEADLK;
328
Jason A. Donenfeld70d906b2015-12-06 02:51:37 +0100329 walk->iv = desc->info;
Herbert Xu5cde0af2006-08-22 00:07:53 +1000330 walk->nbytes = walk->total;
331 if (unlikely(!walk->total))
332 return 0;
333
334 walk->buffer = NULL;
Ard Biesheuvel822be002014-03-04 13:28:38 +0800335 if (unlikely(((unsigned long)walk->iv & walk->alignmask))) {
336 int err = blkcipher_copy_iv(walk);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000337 if (err)
338 return err;
339 }
340
341 scatterwalk_start(&walk->in, walk->in.sg);
342 scatterwalk_start(&walk->out, walk->out.sg);
343 walk->page = NULL;
344
345 return blkcipher_walk_next(desc, walk);
346}
347
Herbert Xu7607bd82007-10-04 15:24:05 +0800348int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
349 struct blkcipher_walk *walk,
350 unsigned int blocksize)
351{
352 walk->flags &= ~BLKCIPHER_WALK_PHYS;
Ard Biesheuvel822be002014-03-04 13:28:38 +0800353 walk->walk_blocksize = blocksize;
354 walk->cipher_blocksize = crypto_blkcipher_blocksize(desc->tfm);
355 walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
356 walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
Herbert Xu7607bd82007-10-04 15:24:05 +0800357 return blkcipher_walk_first(desc, walk);
358}
359EXPORT_SYMBOL_GPL(blkcipher_walk_virt_block);
360
Ard Biesheuvel4f7f1d72014-03-04 13:28:39 +0800361int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc,
362 struct blkcipher_walk *walk,
363 struct crypto_aead *tfm,
364 unsigned int blocksize)
365{
366 walk->flags &= ~BLKCIPHER_WALK_PHYS;
367 walk->walk_blocksize = blocksize;
368 walk->cipher_blocksize = crypto_aead_blocksize(tfm);
369 walk->ivsize = crypto_aead_ivsize(tfm);
370 walk->alignmask = crypto_aead_alignmask(tfm);
371 return blkcipher_walk_first(desc, walk);
372}
373EXPORT_SYMBOL_GPL(blkcipher_aead_walk_virt_block);
374
Herbert Xu791b4d52007-08-23 16:23:01 +0800375static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key,
376 unsigned int keylen)
Sebastian Siewiorca7c3932007-05-19 19:51:21 +1000377{
378 struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
379 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
380 int ret;
381 u8 *buffer, *alignbuffer;
382 unsigned long absize;
383
384 absize = keylen + alignmask;
385 buffer = kmalloc(absize, GFP_ATOMIC);
386 if (!buffer)
387 return -ENOMEM;
388
389 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
390 memcpy(alignbuffer, key, keylen);
391 ret = cipher->setkey(tfm, alignbuffer, keylen);
Sebastian Siewior06817172007-08-03 20:33:47 +0800392 memset(alignbuffer, 0, keylen);
Sebastian Siewiorca7c3932007-05-19 19:51:21 +1000393 kfree(buffer);
394 return ret;
395}
396
Herbert Xu791b4d52007-08-23 16:23:01 +0800397static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
Herbert Xu5cde0af2006-08-22 00:07:53 +1000398{
399 struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
Sebastian Siewiorca7c3932007-05-19 19:51:21 +1000400 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000401
402 if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
403 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
404 return -EINVAL;
405 }
406
Sebastian Siewiorca7c3932007-05-19 19:51:21 +1000407 if ((unsigned long)key & alignmask)
408 return setkey_unaligned(tfm, key, keylen);
409
Herbert Xu5cde0af2006-08-22 00:07:53 +1000410 return cipher->setkey(tfm, key, keylen);
411}
412
Herbert Xu32e39832007-03-24 14:35:34 +1100413static int async_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
414 unsigned int keylen)
415{
416 return setkey(crypto_ablkcipher_tfm(tfm), key, keylen);
417}
418
419static int async_encrypt(struct ablkcipher_request *req)
420{
421 struct crypto_tfm *tfm = req->base.tfm;
422 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
423 struct blkcipher_desc desc = {
424 .tfm = __crypto_blkcipher_cast(tfm),
425 .info = req->info,
426 .flags = req->base.flags,
427 };
428
429
430 return alg->encrypt(&desc, req->dst, req->src, req->nbytes);
431}
432
433static int async_decrypt(struct ablkcipher_request *req)
434{
435 struct crypto_tfm *tfm = req->base.tfm;
436 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
437 struct blkcipher_desc desc = {
438 .tfm = __crypto_blkcipher_cast(tfm),
439 .info = req->info,
440 .flags = req->base.flags,
441 };
442
443 return alg->decrypt(&desc, req->dst, req->src, req->nbytes);
444}
445
Herbert Xu27d2a332007-01-24 20:50:26 +1100446static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type,
447 u32 mask)
Herbert Xu5cde0af2006-08-22 00:07:53 +1000448{
449 struct blkcipher_alg *cipher = &alg->cra_blkcipher;
450 unsigned int len = alg->cra_ctxsize;
451
Herbert Xu332f88402007-11-15 22:36:07 +0800452 if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK &&
453 cipher->ivsize) {
Herbert Xu5cde0af2006-08-22 00:07:53 +1000454 len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
455 len += cipher->ivsize;
456 }
457
458 return len;
459}
460
Herbert Xu32e39832007-03-24 14:35:34 +1100461static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm)
462{
463 struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
464 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
465
466 crt->setkey = async_setkey;
467 crt->encrypt = async_encrypt;
468 crt->decrypt = async_decrypt;
Herbert Xuecfc4322007-12-05 21:08:36 +1100469 crt->base = __crypto_ablkcipher_cast(tfm);
Herbert Xu32e39832007-03-24 14:35:34 +1100470 crt->ivsize = alg->ivsize;
471
472 return 0;
473}
474
475static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm)
Herbert Xu5cde0af2006-08-22 00:07:53 +1000476{
477 struct blkcipher_tfm *crt = &tfm->crt_blkcipher;
478 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
479 unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1;
480 unsigned long addr;
481
Herbert Xu5cde0af2006-08-22 00:07:53 +1000482 crt->setkey = setkey;
483 crt->encrypt = alg->encrypt;
484 crt->decrypt = alg->decrypt;
485
486 addr = (unsigned long)crypto_tfm_ctx(tfm);
487 addr = ALIGN(addr, align);
488 addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align);
489 crt->iv = (void *)addr;
490
491 return 0;
492}
493
Herbert Xu32e39832007-03-24 14:35:34 +1100494static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
495{
496 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
497
498 if (alg->ivsize > PAGE_SIZE / 8)
499 return -EINVAL;
500
Herbert Xu332f88402007-11-15 22:36:07 +0800501 if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK)
Herbert Xu32e39832007-03-24 14:35:34 +1100502 return crypto_init_blkcipher_ops_sync(tfm);
503 else
504 return crypto_init_blkcipher_ops_async(tfm);
505}
506
Herbert Xu3acc8472011-11-03 23:46:07 +1100507#ifdef CONFIG_NET
Steffen Klassert50496a12011-09-27 07:41:54 +0200508static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
509{
510 struct crypto_report_blkcipher rblkcipher;
511
Mathias Krause9a5467b2013-02-05 18:19:13 +0100512 strncpy(rblkcipher.type, "blkcipher", sizeof(rblkcipher.type));
513 strncpy(rblkcipher.geniv, alg->cra_blkcipher.geniv ?: "<default>",
514 sizeof(rblkcipher.geniv));
Steffen Klassert50496a12011-09-27 07:41:54 +0200515
516 rblkcipher.blocksize = alg->cra_blocksize;
517 rblkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
518 rblkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
519 rblkcipher.ivsize = alg->cra_blkcipher.ivsize;
520
David S. Miller6662df32012-04-01 20:19:05 -0400521 if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
522 sizeof(struct crypto_report_blkcipher), &rblkcipher))
523 goto nla_put_failure;
Steffen Klassert50496a12011-09-27 07:41:54 +0200524 return 0;
525
526nla_put_failure:
527 return -EMSGSIZE;
528}
Herbert Xu3acc8472011-11-03 23:46:07 +1100529#else
530static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
531{
532 return -ENOSYS;
533}
534#endif
Steffen Klassert50496a12011-09-27 07:41:54 +0200535
Herbert Xu5cde0af2006-08-22 00:07:53 +1000536static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
Herbert Xu03f5d8c2006-12-31 10:42:06 +1100537 __attribute__ ((unused));
Herbert Xu5cde0af2006-08-22 00:07:53 +1000538static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
539{
540 seq_printf(m, "type : blkcipher\n");
541 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
542 seq_printf(m, "min keysize : %u\n", alg->cra_blkcipher.min_keysize);
543 seq_printf(m, "max keysize : %u\n", alg->cra_blkcipher.max_keysize);
544 seq_printf(m, "ivsize : %u\n", alg->cra_blkcipher.ivsize);
Herbert Xu23508e12007-11-27 21:33:24 +0800545 seq_printf(m, "geniv : %s\n", alg->cra_blkcipher.geniv ?:
546 "<default>");
Herbert Xu5cde0af2006-08-22 00:07:53 +1000547}
548
549const struct crypto_type crypto_blkcipher_type = {
550 .ctxsize = crypto_blkcipher_ctxsize,
551 .init = crypto_init_blkcipher_ops,
552#ifdef CONFIG_PROC_FS
553 .show = crypto_blkcipher_show,
554#endif
Steffen Klassert50496a12011-09-27 07:41:54 +0200555 .report = crypto_blkcipher_report,
Herbert Xu5cde0af2006-08-22 00:07:53 +1000556};
557EXPORT_SYMBOL_GPL(crypto_blkcipher_type);
558
Herbert Xu5cde0af2006-08-22 00:07:53 +1000559MODULE_LICENSE("GPL");
560MODULE_DESCRIPTION("Generic block chaining cipher type");