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TOMOYO Linux Cross Reference
Linux/crypto/blkcipher.c

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  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 
 17 #include <crypto/aead.h>
 18 #include <crypto/internal/skcipher.h>
 19 #include <crypto/scatterwalk.h>
 20 #include <linux/errno.h>
 21 #include <linux/kernel.h>
 22 #include <linux/module.h>
 23 #include <linux/seq_file.h>
 24 #include <linux/slab.h>
 25 #include <linux/string.h>
 26 #include <linux/cryptouser.h>
 27 #include <linux/compiler.h>
 28 #include <net/netlink.h>
 29 
 30 #include "internal.h"
 31 
 32 enum {
 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 
 39 static int blkcipher_walk_next(struct blkcipher_desc *desc,
 40                                struct blkcipher_walk *walk);
 41 static int blkcipher_walk_first(struct blkcipher_desc *desc,
 42                                 struct blkcipher_walk *walk);
 43 
 44 static inline void blkcipher_map_src(struct blkcipher_walk *walk)
 45 {
 46         walk->src.virt.addr = scatterwalk_map(&walk->in);
 47 }
 48 
 49 static inline void blkcipher_map_dst(struct blkcipher_walk *walk)
 50 {
 51         walk->dst.virt.addr = scatterwalk_map(&walk->out);
 52 }
 53 
 54 static inline void blkcipher_unmap_src(struct blkcipher_walk *walk)
 55 {
 56         scatterwalk_unmap(walk->src.virt.addr);
 57 }
 58 
 59 static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk)
 60 {
 61         scatterwalk_unmap(walk->dst.virt.addr);
 62 }
 63 
 64 /* 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  */
 67 static inline u8 *blkcipher_get_spot(u8 *start, unsigned int len)
 68 {
 69         u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
 70         return max(start, end_page);
 71 }
 72 
 73 static inline void blkcipher_done_slow(struct blkcipher_walk *walk,
 74                                        unsigned int bsize)
 75 {
 76         u8 *addr;
 77 
 78         addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
 79         addr = blkcipher_get_spot(addr, bsize);
 80         scatterwalk_copychunks(addr, &walk->out, bsize, 1);
 81 }
 82 
 83 static inline void blkcipher_done_fast(struct blkcipher_walk *walk,
 84                                        unsigned int n)
 85 {
 86         if (walk->flags & BLKCIPHER_WALK_COPY) {
 87                 blkcipher_map_dst(walk);
 88                 memcpy(walk->dst.virt.addr, walk->page, n);
 89                 blkcipher_unmap_dst(walk);
 90         } else if (!(walk->flags & BLKCIPHER_WALK_PHYS)) {
 91                 if (walk->flags & BLKCIPHER_WALK_DIFF)
 92                         blkcipher_unmap_dst(walk);
 93                 blkcipher_unmap_src(walk);
 94         }
 95 
 96         scatterwalk_advance(&walk->in, n);
 97         scatterwalk_advance(&walk->out, n);
 98 }
 99 
100 int blkcipher_walk_done(struct blkcipher_desc *desc,
101                         struct blkcipher_walk *walk, int err)
102 {
103         unsigned int n; /* bytes processed */
104         bool more;
105 
106         if (unlikely(err < 0))
107                 goto finish;
108 
109         n = walk->nbytes - err;
110         walk->total -= n;
111         more = (walk->total != 0);
112 
113         if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW))) {
114                 blkcipher_done_fast(walk, n);
115         } else {
116                 if (WARN_ON(err)) {
117                         /* unexpected case; didn't process all bytes */
118                         err = -EINVAL;
119                         goto finish;
120                 }
121                 blkcipher_done_slow(walk, n);
122         }
123 
124         scatterwalk_done(&walk->in, 0, more);
125         scatterwalk_done(&walk->out, 1, more);
126 
127         if (more) {
128                 crypto_yield(desc->flags);
129                 return blkcipher_walk_next(desc, walk);
130         }
131         err = 0;
132 finish:
133         walk->nbytes = 0;
134         if (walk->iv != desc->info)
135                 memcpy(desc->info, walk->iv, walk->ivsize);
136         if (walk->buffer != walk->page)
137                 kfree(walk->buffer);
138         if (walk->page)
139                 free_page((unsigned long)walk->page);
140         return err;
141 }
142 EXPORT_SYMBOL_GPL(blkcipher_walk_done);
143 
144 static inline int blkcipher_next_slow(struct blkcipher_desc *desc,
145                                       struct blkcipher_walk *walk,
146                                       unsigned int bsize,
147                                       unsigned int alignmask)
148 {
149         unsigned int n;
150         unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
151 
152         if (walk->buffer)
153                 goto ok;
154 
155         walk->buffer = walk->page;
156         if (walk->buffer)
157                 goto ok;
158 
159         n = aligned_bsize * 3 - (alignmask + 1) +
160             (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
161         walk->buffer = kmalloc(n, GFP_ATOMIC);
162         if (!walk->buffer)
163                 return blkcipher_walk_done(desc, walk, -ENOMEM);
164 
165 ok:
166         walk->dst.virt.addr = (u8 *)ALIGN((unsigned long)walk->buffer,
167                                           alignmask + 1);
168         walk->dst.virt.addr = blkcipher_get_spot(walk->dst.virt.addr, bsize);
169         walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr +
170                                                  aligned_bsize, bsize);
171 
172         scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0);
173 
174         walk->nbytes = bsize;
175         walk->flags |= BLKCIPHER_WALK_SLOW;
176 
177         return 0;
178 }
179 
180 static inline int blkcipher_next_copy(struct blkcipher_walk *walk)
181 {
182         u8 *tmp = walk->page;
183 
184         blkcipher_map_src(walk);
185         memcpy(tmp, walk->src.virt.addr, walk->nbytes);
186         blkcipher_unmap_src(walk);
187 
188         walk->src.virt.addr = tmp;
189         walk->dst.virt.addr = tmp;
190 
191         return 0;
192 }
193 
194 static inline int blkcipher_next_fast(struct blkcipher_desc *desc,
195                                       struct blkcipher_walk *walk)
196 {
197         unsigned long diff;
198 
199         walk->src.phys.page = scatterwalk_page(&walk->in);
200         walk->src.phys.offset = offset_in_page(walk->in.offset);
201         walk->dst.phys.page = scatterwalk_page(&walk->out);
202         walk->dst.phys.offset = offset_in_page(walk->out.offset);
203 
204         if (walk->flags & BLKCIPHER_WALK_PHYS)
205                 return 0;
206 
207         diff = walk->src.phys.offset - walk->dst.phys.offset;
208         diff |= walk->src.virt.page - walk->dst.virt.page;
209 
210         blkcipher_map_src(walk);
211         walk->dst.virt.addr = walk->src.virt.addr;
212 
213         if (diff) {
214                 walk->flags |= BLKCIPHER_WALK_DIFF;
215                 blkcipher_map_dst(walk);
216         }
217 
218         return 0;
219 }
220 
221 static int blkcipher_walk_next(struct blkcipher_desc *desc,
222                                struct blkcipher_walk *walk)
223 {
224         unsigned int bsize;
225         unsigned int n;
226         int err;
227 
228         n = walk->total;
229         if (unlikely(n < walk->cipher_blocksize)) {
230                 desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
231                 return blkcipher_walk_done(desc, walk, -EINVAL);
232         }
233 
234         bsize = min(walk->walk_blocksize, n);
235 
236         walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY |
237                          BLKCIPHER_WALK_DIFF);
238         if (!scatterwalk_aligned(&walk->in, walk->alignmask) ||
239             !scatterwalk_aligned(&walk->out, walk->alignmask)) {
240                 walk->flags |= BLKCIPHER_WALK_COPY;
241                 if (!walk->page) {
242                         walk->page = (void *)__get_free_page(GFP_ATOMIC);
243                         if (!walk->page)
244                                 n = 0;
245                 }
246         }
247 
248         n = scatterwalk_clamp(&walk->in, n);
249         n = scatterwalk_clamp(&walk->out, n);
250 
251         if (unlikely(n < bsize)) {
252                 err = blkcipher_next_slow(desc, walk, bsize, walk->alignmask);
253                 goto set_phys_lowmem;
254         }
255 
256         walk->nbytes = n;
257         if (walk->flags & BLKCIPHER_WALK_COPY) {
258                 err = blkcipher_next_copy(walk);
259                 goto set_phys_lowmem;
260         }
261 
262         return blkcipher_next_fast(desc, walk);
263 
264 set_phys_lowmem:
265         if (walk->flags & BLKCIPHER_WALK_PHYS) {
266                 walk->src.phys.page = virt_to_page(walk->src.virt.addr);
267                 walk->dst.phys.page = virt_to_page(walk->dst.virt.addr);
268                 walk->src.phys.offset &= PAGE_SIZE - 1;
269                 walk->dst.phys.offset &= PAGE_SIZE - 1;
270         }
271         return err;
272 }
273 
274 static inline int blkcipher_copy_iv(struct blkcipher_walk *walk)
275 {
276         unsigned bs = walk->walk_blocksize;
277         unsigned aligned_bs = ALIGN(bs, walk->alignmask + 1);
278         unsigned int size = aligned_bs * 2 +
279                             walk->ivsize + max(aligned_bs, walk->ivsize) -
280                             (walk->alignmask + 1);
281         u8 *iv;
282 
283         size += walk->alignmask & ~(crypto_tfm_ctx_alignment() - 1);
284         walk->buffer = kmalloc(size, GFP_ATOMIC);
285         if (!walk->buffer)
286                 return -ENOMEM;
287 
288         iv = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
289         iv = blkcipher_get_spot(iv, bs) + aligned_bs;
290         iv = blkcipher_get_spot(iv, bs) + aligned_bs;
291         iv = blkcipher_get_spot(iv, walk->ivsize);
292 
293         walk->iv = memcpy(iv, walk->iv, walk->ivsize);
294         return 0;
295 }
296 
297 int blkcipher_walk_virt(struct blkcipher_desc *desc,
298                         struct blkcipher_walk *walk)
299 {
300         walk->flags &= ~BLKCIPHER_WALK_PHYS;
301         walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm);
302         walk->cipher_blocksize = walk->walk_blocksize;
303         walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
304         walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
305         return blkcipher_walk_first(desc, walk);
306 }
307 EXPORT_SYMBOL_GPL(blkcipher_walk_virt);
308 
309 int blkcipher_walk_phys(struct blkcipher_desc *desc,
310                         struct blkcipher_walk *walk)
311 {
312         walk->flags |= BLKCIPHER_WALK_PHYS;
313         walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm);
314         walk->cipher_blocksize = walk->walk_blocksize;
315         walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
316         walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
317         return blkcipher_walk_first(desc, walk);
318 }
319 EXPORT_SYMBOL_GPL(blkcipher_walk_phys);
320 
321 static int blkcipher_walk_first(struct blkcipher_desc *desc,
322                                 struct blkcipher_walk *walk)
323 {
324         if (WARN_ON_ONCE(in_irq()))
325                 return -EDEADLK;
326 
327         walk->iv = desc->info;
328         walk->nbytes = walk->total;
329         if (unlikely(!walk->total))
330                 return 0;
331 
332         walk->buffer = NULL;
333         if (unlikely(((unsigned long)walk->iv & walk->alignmask))) {
334                 int err = blkcipher_copy_iv(walk);
335                 if (err)
336                         return err;
337         }
338 
339         scatterwalk_start(&walk->in, walk->in.sg);
340         scatterwalk_start(&walk->out, walk->out.sg);
341         walk->page = NULL;
342 
343         return blkcipher_walk_next(desc, walk);
344 }
345 
346 int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
347                               struct blkcipher_walk *walk,
348                               unsigned int blocksize)
349 {
350         walk->flags &= ~BLKCIPHER_WALK_PHYS;
351         walk->walk_blocksize = blocksize;
352         walk->cipher_blocksize = crypto_blkcipher_blocksize(desc->tfm);
353         walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
354         walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
355         return blkcipher_walk_first(desc, walk);
356 }
357 EXPORT_SYMBOL_GPL(blkcipher_walk_virt_block);
358 
359 int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc,
360                                    struct blkcipher_walk *walk,
361                                    struct crypto_aead *tfm,
362                                    unsigned int blocksize)
363 {
364         walk->flags &= ~BLKCIPHER_WALK_PHYS;
365         walk->walk_blocksize = blocksize;
366         walk->cipher_blocksize = crypto_aead_blocksize(tfm);
367         walk->ivsize = crypto_aead_ivsize(tfm);
368         walk->alignmask = crypto_aead_alignmask(tfm);
369         return blkcipher_walk_first(desc, walk);
370 }
371 EXPORT_SYMBOL_GPL(blkcipher_aead_walk_virt_block);
372 
373 static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key,
374                             unsigned int keylen)
375 {
376         struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
377         unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
378         int ret;
379         u8 *buffer, *alignbuffer;
380         unsigned long absize;
381 
382         absize = keylen + alignmask;
383         buffer = kmalloc(absize, GFP_ATOMIC);
384         if (!buffer)
385                 return -ENOMEM;
386 
387         alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
388         memcpy(alignbuffer, key, keylen);
389         ret = cipher->setkey(tfm, alignbuffer, keylen);
390         memset(alignbuffer, 0, keylen);
391         kfree(buffer);
392         return ret;
393 }
394 
395 static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
396 {
397         struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
398         unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
399 
400         if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
401                 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
402                 return -EINVAL;
403         }
404 
405         if ((unsigned long)key & alignmask)
406                 return setkey_unaligned(tfm, key, keylen);
407 
408         return cipher->setkey(tfm, key, keylen);
409 }
410 
411 static int async_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
412                         unsigned int keylen)
413 {
414         return setkey(crypto_ablkcipher_tfm(tfm), key, keylen);
415 }
416 
417 static int async_encrypt(struct ablkcipher_request *req)
418 {
419         struct crypto_tfm *tfm = req->base.tfm;
420         struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
421         struct blkcipher_desc desc = {
422                 .tfm = __crypto_blkcipher_cast(tfm),
423                 .info = req->info,
424                 .flags = req->base.flags,
425         };
426 
427 
428         return alg->encrypt(&desc, req->dst, req->src, req->nbytes);
429 }
430 
431 static int async_decrypt(struct ablkcipher_request *req)
432 {
433         struct crypto_tfm *tfm = req->base.tfm;
434         struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
435         struct blkcipher_desc desc = {
436                 .tfm = __crypto_blkcipher_cast(tfm),
437                 .info = req->info,
438                 .flags = req->base.flags,
439         };
440 
441         return alg->decrypt(&desc, req->dst, req->src, req->nbytes);
442 }
443 
444 static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type,
445                                              u32 mask)
446 {
447         struct blkcipher_alg *cipher = &alg->cra_blkcipher;
448         unsigned int len = alg->cra_ctxsize;
449 
450         if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK &&
451             cipher->ivsize) {
452                 len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
453                 len += cipher->ivsize;
454         }
455 
456         return len;
457 }
458 
459 static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm)
460 {
461         struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
462         struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
463 
464         crt->setkey = async_setkey;
465         crt->encrypt = async_encrypt;
466         crt->decrypt = async_decrypt;
467         crt->base = __crypto_ablkcipher_cast(tfm);
468         crt->ivsize = alg->ivsize;
469 
470         return 0;
471 }
472 
473 static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm)
474 {
475         struct blkcipher_tfm *crt = &tfm->crt_blkcipher;
476         struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
477         unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1;
478         unsigned long addr;
479 
480         crt->setkey = setkey;
481         crt->encrypt = alg->encrypt;
482         crt->decrypt = alg->decrypt;
483 
484         addr = (unsigned long)crypto_tfm_ctx(tfm);
485         addr = ALIGN(addr, align);
486         addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align);
487         crt->iv = (void *)addr;
488 
489         return 0;
490 }
491 
492 static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
493 {
494         struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
495 
496         if (alg->ivsize > PAGE_SIZE / 8)
497                 return -EINVAL;
498 
499         if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK)
500                 return crypto_init_blkcipher_ops_sync(tfm);
501         else
502                 return crypto_init_blkcipher_ops_async(tfm);
503 }
504 
505 #ifdef CONFIG_NET
506 static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
507 {
508         struct crypto_report_blkcipher rblkcipher;
509 
510         memset(&rblkcipher, 0, sizeof(rblkcipher));
511 
512         strscpy(rblkcipher.type, "blkcipher", sizeof(rblkcipher.type));
513         strscpy(rblkcipher.geniv, "<default>", sizeof(rblkcipher.geniv));
514 
515         rblkcipher.blocksize = alg->cra_blocksize;
516         rblkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
517         rblkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
518         rblkcipher.ivsize = alg->cra_blkcipher.ivsize;
519 
520         return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
521                        sizeof(rblkcipher), &rblkcipher);
522 }
523 #else
524 static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
525 {
526         return -ENOSYS;
527 }
528 #endif
529 
530 static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
531         __maybe_unused;
532 static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
533 {
534         seq_printf(m, "type         : blkcipher\n");
535         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
536         seq_printf(m, "min keysize  : %u\n", alg->cra_blkcipher.min_keysize);
537         seq_printf(m, "max keysize  : %u\n", alg->cra_blkcipher.max_keysize);
538         seq_printf(m, "ivsize       : %u\n", alg->cra_blkcipher.ivsize);
539         seq_printf(m, "geniv        : <default>\n");
540 }
541 
542 const struct crypto_type crypto_blkcipher_type = {
543         .ctxsize = crypto_blkcipher_ctxsize,
544         .init = crypto_init_blkcipher_ops,
545 #ifdef CONFIG_PROC_FS
546         .show = crypto_blkcipher_show,
547 #endif
548         .report = crypto_blkcipher_report,
549 };
550 EXPORT_SYMBOL_GPL(crypto_blkcipher_type);
551 
552 MODULE_LICENSE("GPL");
553 MODULE_DESCRIPTION("Generic block chaining cipher type");
554 

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