blob: 11b981492031361f7cdf336b58ecbb98b8951196 [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>
24#include <linux/scatterlist.h>
25#include <linux/seq_file.h>
26#include <linux/slab.h>
27#include <linux/string.h>
Steffen Klassert50496a12011-09-27 07:41:54 +020028#include <linux/cryptouser.h>
29#include <net/netlink.h>
Herbert Xu5cde0af2006-08-22 00:07:53 +100030
31#include "internal.h"
Herbert Xu5cde0af2006-08-22 00:07:53 +100032
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{
Cong Wangf0dfc0b2011-11-25 23:14:17 +080047 walk->src.virt.addr = scatterwalk_map(&walk->in);
Herbert Xu5cde0af2006-08-22 00:07:53 +100048}
49
50static inline void blkcipher_map_dst(struct blkcipher_walk *walk)
51{
Cong Wangf0dfc0b2011-11-25 23:14:17 +080052 walk->dst.virt.addr = scatterwalk_map(&walk->out);
Herbert Xu5cde0af2006-08-22 00:07:53 +100053}
54
55static inline void blkcipher_unmap_src(struct blkcipher_walk *walk)
56{
Cong Wangf0dfc0b2011-11-25 23:14:17 +080057 scatterwalk_unmap(walk->src.virt.addr);
Herbert Xu5cde0af2006-08-22 00:07:53 +100058}
59
60static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk)
61{
Cong Wangf0dfc0b2011-11-25 23:14:17 +080062 scatterwalk_unmap(walk->dst.virt.addr);
Herbert Xu5cde0af2006-08-22 00:07:53 +100063}
64
Herbert Xue4630f92007-09-09 08:45:21 +010065/* 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 */
Herbert Xu5cde0af2006-08-22 00:07:53 +100068static inline u8 *blkcipher_get_spot(u8 *start, unsigned int len)
69{
Herbert Xue4630f92007-09-09 08:45:21 +010070 u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
Ingo Oeser5aaff0c2007-09-19 19:11:41 +080071 return max(start, end_page);
Herbert Xu5cde0af2006-08-22 00:07:53 +100072}
73
Ard Biesheuvel822be002014-03-04 13:28:38 +080074static inline unsigned int blkcipher_done_slow(struct blkcipher_walk *walk,
Herbert Xu5cde0af2006-08-22 00:07:53 +100075 unsigned int bsize)
76{
77 u8 *addr;
Herbert Xu5cde0af2006-08-22 00:07:53 +100078
Ard Biesheuvel822be002014-03-04 13:28:38 +080079 addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
Herbert Xu5cde0af2006-08-22 00:07:53 +100080 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{
Herbert Xu5cde0af2006-08-22 00:07:53 +100088 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)) {
Herbert Xu5cde0af2006-08-22 00:07:53 +100093 if (walk->flags & BLKCIPHER_WALK_DIFF)
94 blkcipher_unmap_dst(walk);
Peter Zijlstra61ecdb802010-10-26 14:21:47 -070095 blkcipher_unmap_src(walk);
Herbert Xu5cde0af2006-08-22 00:07:53 +100096 }
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{
Herbert Xu5cde0af2006-08-22 00:07:53 +1000107 unsigned int nbytes = 0;
108
109 if (likely(err >= 0)) {
Herbert Xu7607bd82007-10-04 15:24:05 +0800110 unsigned int n = walk->nbytes - err;
Herbert Xu5cde0af2006-08-22 00:07:53 +1000111
112 if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW)))
Herbert Xu7607bd82007-10-04 15:24:05 +0800113 n = blkcipher_done_fast(walk, n);
114 else if (WARN_ON(err)) {
115 err = -EINVAL;
116 goto err;
117 } else
Ard Biesheuvel822be002014-03-04 13:28:38 +0800118 n = blkcipher_done_slow(walk, n);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000119
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
Herbert Xubac1b5c2009-01-16 14:40:54 +1100127err:
Herbert Xu5cde0af2006-08-22 00:07:53 +1000128 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)
Ard Biesheuvel822be002014-03-04 13:28:38 +0800137 memcpy(desc->info, walk->iv, walk->ivsize);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000138 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;
Herbert Xu70613782007-09-29 21:24:23 +0800153 unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000154
155 if (walk->buffer)
156 goto ok;
157
158 walk->buffer = walk->page;
159 if (walk->buffer)
160 goto ok;
161
Herbert Xu2614de12007-10-04 14:49:00 +0800162 n = aligned_bsize * 3 - (alignmask + 1) +
Herbert Xue4630f92007-09-09 08:45:21 +0100163 (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
Herbert Xu5cde0af2006-08-22 00:07:53 +1000164 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);
Herbert Xu70613782007-09-29 21:24:23 +0800172 walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr +
173 aligned_bsize, bsize);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000174
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{
Herbert Xu7607bd82007-10-04 15:24:05 +0800227 unsigned int bsize;
Herbert Xu5cde0af2006-08-22 00:07:53 +1000228 unsigned int n;
229 int err;
230
231 n = walk->total;
Ard Biesheuvel822be002014-03-04 13:28:38 +0800232 if (unlikely(n < walk->cipher_blocksize)) {
Herbert Xu5cde0af2006-08-22 00:07:53 +1000233 desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
234 return blkcipher_walk_done(desc, walk, -EINVAL);
235 }
236
237 walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY |
238 BLKCIPHER_WALK_DIFF);
Ard Biesheuvel822be002014-03-04 13:28:38 +0800239 if (!scatterwalk_aligned(&walk->in, walk->alignmask) ||
240 !scatterwalk_aligned(&walk->out, walk->alignmask)) {
Herbert Xu5cde0af2006-08-22 00:07:53 +1000241 walk->flags |= BLKCIPHER_WALK_COPY;
242 if (!walk->page) {
243 walk->page = (void *)__get_free_page(GFP_ATOMIC);
244 if (!walk->page)
245 n = 0;
246 }
247 }
248
Ard Biesheuvel822be002014-03-04 13:28:38 +0800249 bsize = min(walk->walk_blocksize, n);
Herbert Xu5cde0af2006-08-22 00:07:53 +1000250 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
Herbert Xu5cde0af2006-08-22 00:07:53 +1000329 walk->nbytes = walk->total;
330 if (unlikely(!walk->total))
331 return 0;
332
333 walk->buffer = NULL;
334 walk->iv = desc->info;
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 Xub9c55aa2007-12-04 12:46:48 +1100469 if (!alg->ivsize) {
470 crt->givencrypt = skcipher_null_givencrypt;
471 crt->givdecrypt = skcipher_null_givdecrypt;
472 }
Herbert Xuecfc4322007-12-05 21:08:36 +1100473 crt->base = __crypto_ablkcipher_cast(tfm);
Herbert Xu32e39832007-03-24 14:35:34 +1100474 crt->ivsize = alg->ivsize;
475
476 return 0;
477}
478
479static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm)
Herbert Xu5cde0af2006-08-22 00:07:53 +1000480{
481 struct blkcipher_tfm *crt = &tfm->crt_blkcipher;
482 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
483 unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1;
484 unsigned long addr;
485
Herbert Xu5cde0af2006-08-22 00:07:53 +1000486 crt->setkey = setkey;
487 crt->encrypt = alg->encrypt;
488 crt->decrypt = alg->decrypt;
489
490 addr = (unsigned long)crypto_tfm_ctx(tfm);
491 addr = ALIGN(addr, align);
492 addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align);
493 crt->iv = (void *)addr;
494
495 return 0;
496}
497
Herbert Xu32e39832007-03-24 14:35:34 +1100498static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
499{
500 struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
501
502 if (alg->ivsize > PAGE_SIZE / 8)
503 return -EINVAL;
504
Herbert Xu332f88402007-11-15 22:36:07 +0800505 if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK)
Herbert Xu32e39832007-03-24 14:35:34 +1100506 return crypto_init_blkcipher_ops_sync(tfm);
507 else
508 return crypto_init_blkcipher_ops_async(tfm);
509}
510
Herbert Xu3acc8472011-11-03 23:46:07 +1100511#ifdef CONFIG_NET
Steffen Klassert50496a12011-09-27 07:41:54 +0200512static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
513{
514 struct crypto_report_blkcipher rblkcipher;
515
Mathias Krause9a5467b2013-02-05 18:19:13 +0100516 strncpy(rblkcipher.type, "blkcipher", sizeof(rblkcipher.type));
517 strncpy(rblkcipher.geniv, alg->cra_blkcipher.geniv ?: "<default>",
518 sizeof(rblkcipher.geniv));
Steffen Klassert50496a12011-09-27 07:41:54 +0200519
520 rblkcipher.blocksize = alg->cra_blocksize;
521 rblkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
522 rblkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
523 rblkcipher.ivsize = alg->cra_blkcipher.ivsize;
524
David S. Miller6662df32012-04-01 20:19:05 -0400525 if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
526 sizeof(struct crypto_report_blkcipher), &rblkcipher))
527 goto nla_put_failure;
Steffen Klassert50496a12011-09-27 07:41:54 +0200528 return 0;
529
530nla_put_failure:
531 return -EMSGSIZE;
532}
Herbert Xu3acc8472011-11-03 23:46:07 +1100533#else
534static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
535{
536 return -ENOSYS;
537}
538#endif
Steffen Klassert50496a12011-09-27 07:41:54 +0200539
Herbert Xu5cde0af2006-08-22 00:07:53 +1000540static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
Herbert Xu03f5d8c2006-12-31 10:42:06 +1100541 __attribute__ ((unused));
Herbert Xu5cde0af2006-08-22 00:07:53 +1000542static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
543{
544 seq_printf(m, "type : blkcipher\n");
545 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
546 seq_printf(m, "min keysize : %u\n", alg->cra_blkcipher.min_keysize);
547 seq_printf(m, "max keysize : %u\n", alg->cra_blkcipher.max_keysize);
548 seq_printf(m, "ivsize : %u\n", alg->cra_blkcipher.ivsize);
Herbert Xu23508e12007-11-27 21:33:24 +0800549 seq_printf(m, "geniv : %s\n", alg->cra_blkcipher.geniv ?:
550 "<default>");
Herbert Xu5cde0af2006-08-22 00:07:53 +1000551}
552
553const struct crypto_type crypto_blkcipher_type = {
554 .ctxsize = crypto_blkcipher_ctxsize,
555 .init = crypto_init_blkcipher_ops,
556#ifdef CONFIG_PROC_FS
557 .show = crypto_blkcipher_show,
558#endif
Steffen Klassert50496a12011-09-27 07:41:54 +0200559 .report = crypto_blkcipher_report,
Herbert Xu5cde0af2006-08-22 00:07:53 +1000560};
561EXPORT_SYMBOL_GPL(crypto_blkcipher_type);
562
Herbert Xuecfc4322007-12-05 21:08:36 +1100563static int crypto_grab_nivcipher(struct crypto_skcipher_spawn *spawn,
564 const char *name, u32 type, u32 mask)
565{
566 struct crypto_alg *alg;
567 int err;
568
569 type = crypto_skcipher_type(type);
Herbert Xub170a132009-02-18 20:33:55 +0800570 mask = crypto_skcipher_mask(mask)| CRYPTO_ALG_GENIV;
Herbert Xuecfc4322007-12-05 21:08:36 +1100571
572 alg = crypto_alg_mod_lookup(name, type, mask);
573 if (IS_ERR(alg))
574 return PTR_ERR(alg);
575
576 err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
577 crypto_mod_put(alg);
578 return err;
579}
580
581struct crypto_instance *skcipher_geniv_alloc(struct crypto_template *tmpl,
582 struct rtattr **tb, u32 type,
583 u32 mask)
584{
585 struct {
586 int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key,
587 unsigned int keylen);
588 int (*encrypt)(struct ablkcipher_request *req);
589 int (*decrypt)(struct ablkcipher_request *req);
590
591 unsigned int min_keysize;
592 unsigned int max_keysize;
593 unsigned int ivsize;
594
595 const char *geniv;
596 } balg;
597 const char *name;
598 struct crypto_skcipher_spawn *spawn;
599 struct crypto_attr_type *algt;
600 struct crypto_instance *inst;
601 struct crypto_alg *alg;
602 int err;
603
604 algt = crypto_get_attr_type(tb);
Herbert Xuecfc4322007-12-05 21:08:36 +1100605 if (IS_ERR(algt))
Julia Lawall3e8afe32013-01-22 12:29:26 +0100606 return ERR_CAST(algt);
Herbert Xuecfc4322007-12-05 21:08:36 +1100607
608 if ((algt->type ^ (CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV)) &
609 algt->mask)
610 return ERR_PTR(-EINVAL);
611
612 name = crypto_attr_alg_name(tb[1]);
Herbert Xuecfc4322007-12-05 21:08:36 +1100613 if (IS_ERR(name))
Julia Lawall3e8afe32013-01-22 12:29:26 +0100614 return ERR_CAST(name);
Herbert Xuecfc4322007-12-05 21:08:36 +1100615
616 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
617 if (!inst)
618 return ERR_PTR(-ENOMEM);
619
620 spawn = crypto_instance_ctx(inst);
621
622 /* Ignore async algorithms if necessary. */
623 mask |= crypto_requires_sync(algt->type, algt->mask);
624
625 crypto_set_skcipher_spawn(spawn, inst);
626 err = crypto_grab_nivcipher(spawn, name, type, mask);
627 if (err)
628 goto err_free_inst;
629
630 alg = crypto_skcipher_spawn_alg(spawn);
631
632 if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
633 CRYPTO_ALG_TYPE_BLKCIPHER) {
634 balg.ivsize = alg->cra_blkcipher.ivsize;
635 balg.min_keysize = alg->cra_blkcipher.min_keysize;
636 balg.max_keysize = alg->cra_blkcipher.max_keysize;
637
638 balg.setkey = async_setkey;
639 balg.encrypt = async_encrypt;
640 balg.decrypt = async_decrypt;
641
642 balg.geniv = alg->cra_blkcipher.geniv;
643 } else {
644 balg.ivsize = alg->cra_ablkcipher.ivsize;
645 balg.min_keysize = alg->cra_ablkcipher.min_keysize;
646 balg.max_keysize = alg->cra_ablkcipher.max_keysize;
647
648 balg.setkey = alg->cra_ablkcipher.setkey;
649 balg.encrypt = alg->cra_ablkcipher.encrypt;
650 balg.decrypt = alg->cra_ablkcipher.decrypt;
651
652 balg.geniv = alg->cra_ablkcipher.geniv;
653 }
654
655 err = -EINVAL;
656 if (!balg.ivsize)
657 goto err_drop_alg;
658
659 /*
660 * This is only true if we're constructing an algorithm with its
661 * default IV generator. For the default generator we elide the
662 * template name and double-check the IV generator.
663 */
664 if (algt->mask & CRYPTO_ALG_GENIV) {
665 if (!balg.geniv)
666 balg.geniv = crypto_default_geniv(alg);
667 err = -EAGAIN;
668 if (strcmp(tmpl->name, balg.geniv))
669 goto err_drop_alg;
670
671 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
672 memcpy(inst->alg.cra_driver_name, alg->cra_driver_name,
673 CRYPTO_MAX_ALG_NAME);
674 } else {
675 err = -ENAMETOOLONG;
676 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
677 "%s(%s)", tmpl->name, alg->cra_name) >=
678 CRYPTO_MAX_ALG_NAME)
679 goto err_drop_alg;
680 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
681 "%s(%s)", tmpl->name, alg->cra_driver_name) >=
682 CRYPTO_MAX_ALG_NAME)
683 goto err_drop_alg;
684 }
685
686 inst->alg.cra_flags = CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV;
687 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
688 inst->alg.cra_priority = alg->cra_priority;
689 inst->alg.cra_blocksize = alg->cra_blocksize;
690 inst->alg.cra_alignmask = alg->cra_alignmask;
691 inst->alg.cra_type = &crypto_givcipher_type;
692
693 inst->alg.cra_ablkcipher.ivsize = balg.ivsize;
694 inst->alg.cra_ablkcipher.min_keysize = balg.min_keysize;
695 inst->alg.cra_ablkcipher.max_keysize = balg.max_keysize;
696 inst->alg.cra_ablkcipher.geniv = balg.geniv;
697
698 inst->alg.cra_ablkcipher.setkey = balg.setkey;
699 inst->alg.cra_ablkcipher.encrypt = balg.encrypt;
700 inst->alg.cra_ablkcipher.decrypt = balg.decrypt;
701
702out:
703 return inst;
704
705err_drop_alg:
706 crypto_drop_skcipher(spawn);
707err_free_inst:
708 kfree(inst);
709 inst = ERR_PTR(err);
710 goto out;
711}
712EXPORT_SYMBOL_GPL(skcipher_geniv_alloc);
713
714void skcipher_geniv_free(struct crypto_instance *inst)
715{
716 crypto_drop_skcipher(crypto_instance_ctx(inst));
717 kfree(inst);
718}
719EXPORT_SYMBOL_GPL(skcipher_geniv_free);
720
721int skcipher_geniv_init(struct crypto_tfm *tfm)
722{
723 struct crypto_instance *inst = (void *)tfm->__crt_alg;
724 struct crypto_ablkcipher *cipher;
725
726 cipher = crypto_spawn_skcipher(crypto_instance_ctx(inst));
727 if (IS_ERR(cipher))
728 return PTR_ERR(cipher);
729
730 tfm->crt_ablkcipher.base = cipher;
731 tfm->crt_ablkcipher.reqsize += crypto_ablkcipher_reqsize(cipher);
732
733 return 0;
734}
735EXPORT_SYMBOL_GPL(skcipher_geniv_init);
736
737void skcipher_geniv_exit(struct crypto_tfm *tfm)
738{
739 crypto_free_ablkcipher(tfm->crt_ablkcipher.base);
740}
741EXPORT_SYMBOL_GPL(skcipher_geniv_exit);
742
Herbert Xu5cde0af2006-08-22 00:07:53 +1000743MODULE_LICENSE("GPL");
744MODULE_DESCRIPTION("Generic block chaining cipher type");