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Commit | Line | Data |
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0a270321 HX |
1 | /* |
2 | * seqiv: Sequence Number IV Generator | |
3 | * | |
4 | * This generator generates an IV based on a sequence number by xoring it | |
5 | * with a salt. This algorithm is mainly useful for CTR and similar modes. | |
6 | * | |
7 | * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the Free | |
11 | * Software Foundation; either version 2 of the License, or (at your option) | |
12 | * any later version. | |
13 | * | |
14 | */ | |
15 | ||
14df4d80 | 16 | #include <crypto/internal/aead.h> |
0a270321 | 17 | #include <crypto/internal/skcipher.h> |
856e3f40 | 18 | #include <crypto/null.h> |
a0f000ec | 19 | #include <crypto/rng.h> |
856e3f40 | 20 | #include <crypto/scatterwalk.h> |
0a270321 HX |
21 | #include <linux/err.h> |
22 | #include <linux/init.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
0a270321 HX |
26 | #include <linux/spinlock.h> |
27 | #include <linux/string.h> | |
28 | ||
dd04446e HX |
29 | struct seqniv_request_ctx { |
30 | struct scatterlist dst[2]; | |
31 | struct aead_request subreq; | |
32 | }; | |
33 | ||
0a270321 HX |
34 | struct seqiv_ctx { |
35 | spinlock_t lock; | |
36 | u8 salt[] __attribute__ ((aligned(__alignof__(u32)))); | |
37 | }; | |
38 | ||
856e3f40 HX |
39 | struct seqiv_aead_ctx { |
40 | struct crypto_aead *child; | |
41 | spinlock_t lock; | |
42 | struct crypto_blkcipher *null; | |
43 | u8 salt[] __attribute__ ((aligned(__alignof__(u32)))); | |
44 | }; | |
45 | ||
0677157b HX |
46 | static void seqiv_free(struct crypto_instance *inst); |
47 | ||
856e3f40 HX |
48 | static int seqiv_aead_setkey(struct crypto_aead *tfm, |
49 | const u8 *key, unsigned int keylen) | |
50 | { | |
51 | struct seqiv_aead_ctx *ctx = crypto_aead_ctx(tfm); | |
52 | ||
53 | return crypto_aead_setkey(ctx->child, key, keylen); | |
54 | } | |
55 | ||
56 | static int seqiv_aead_setauthsize(struct crypto_aead *tfm, | |
57 | unsigned int authsize) | |
58 | { | |
59 | struct seqiv_aead_ctx *ctx = crypto_aead_ctx(tfm); | |
60 | ||
61 | return crypto_aead_setauthsize(ctx->child, authsize); | |
62 | } | |
63 | ||
0a270321 HX |
64 | static void seqiv_complete2(struct skcipher_givcrypt_request *req, int err) |
65 | { | |
66 | struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req); | |
67 | struct crypto_ablkcipher *geniv; | |
68 | ||
69 | if (err == -EINPROGRESS) | |
70 | return; | |
71 | ||
72 | if (err) | |
73 | goto out; | |
74 | ||
75 | geniv = skcipher_givcrypt_reqtfm(req); | |
76 | memcpy(req->creq.info, subreq->info, crypto_ablkcipher_ivsize(geniv)); | |
77 | ||
78 | out: | |
79 | kfree(subreq->info); | |
80 | } | |
81 | ||
82 | static void seqiv_complete(struct crypto_async_request *base, int err) | |
83 | { | |
84 | struct skcipher_givcrypt_request *req = base->data; | |
85 | ||
86 | seqiv_complete2(req, err); | |
87 | skcipher_givcrypt_complete(req, err); | |
88 | } | |
89 | ||
14df4d80 HX |
90 | static void seqiv_aead_complete2(struct aead_givcrypt_request *req, int err) |
91 | { | |
92 | struct aead_request *subreq = aead_givcrypt_reqctx(req); | |
93 | struct crypto_aead *geniv; | |
94 | ||
95 | if (err == -EINPROGRESS) | |
96 | return; | |
97 | ||
98 | if (err) | |
99 | goto out; | |
100 | ||
101 | geniv = aead_givcrypt_reqtfm(req); | |
102 | memcpy(req->areq.iv, subreq->iv, crypto_aead_ivsize(geniv)); | |
103 | ||
104 | out: | |
105 | kfree(subreq->iv); | |
106 | } | |
107 | ||
108 | static void seqiv_aead_complete(struct crypto_async_request *base, int err) | |
109 | { | |
110 | struct aead_givcrypt_request *req = base->data; | |
111 | ||
112 | seqiv_aead_complete2(req, err); | |
113 | aead_givcrypt_complete(req, err); | |
114 | } | |
115 | ||
856e3f40 HX |
116 | static void seqiv_aead_encrypt_complete2(struct aead_request *req, int err) |
117 | { | |
118 | struct aead_request *subreq = aead_request_ctx(req); | |
119 | struct crypto_aead *geniv; | |
120 | ||
121 | if (err == -EINPROGRESS) | |
122 | return; | |
123 | ||
124 | if (err) | |
125 | goto out; | |
126 | ||
127 | geniv = crypto_aead_reqtfm(req); | |
128 | memcpy(req->iv, subreq->iv, crypto_aead_ivsize(geniv)); | |
129 | ||
130 | out: | |
131 | kzfree(subreq->iv); | |
132 | } | |
133 | ||
134 | static void seqiv_aead_encrypt_complete(struct crypto_async_request *base, | |
135 | int err) | |
136 | { | |
137 | struct aead_request *req = base->data; | |
138 | ||
139 | seqiv_aead_encrypt_complete2(req, err); | |
140 | aead_request_complete(req, err); | |
141 | } | |
142 | ||
dd04446e HX |
143 | static void seqniv_aead_encrypt_complete2(struct aead_request *req, int err) |
144 | { | |
145 | unsigned int ivsize = 8; | |
146 | u8 data[20]; | |
147 | ||
148 | if (err == -EINPROGRESS) | |
149 | return; | |
150 | ||
151 | /* Swap IV and ESP header back to correct order. */ | |
152 | scatterwalk_map_and_copy(data, req->dst, 0, req->assoclen + ivsize, 0); | |
153 | scatterwalk_map_and_copy(data + ivsize, req->dst, 0, req->assoclen, 1); | |
154 | scatterwalk_map_and_copy(data, req->dst, req->assoclen, ivsize, 1); | |
155 | } | |
156 | ||
157 | static void seqniv_aead_encrypt_complete(struct crypto_async_request *base, | |
158 | int err) | |
159 | { | |
160 | struct aead_request *req = base->data; | |
161 | ||
162 | seqniv_aead_encrypt_complete2(req, err); | |
163 | aead_request_complete(req, err); | |
164 | } | |
165 | ||
166 | static void seqniv_aead_decrypt_complete2(struct aead_request *req, int err) | |
167 | { | |
168 | u8 data[4]; | |
169 | ||
170 | if (err == -EINPROGRESS) | |
171 | return; | |
172 | ||
173 | /* Move ESP header back to correct location. */ | |
174 | scatterwalk_map_and_copy(data, req->dst, 16, req->assoclen - 8, 0); | |
175 | scatterwalk_map_and_copy(data, req->dst, 8, req->assoclen - 8, 1); | |
176 | } | |
177 | ||
178 | static void seqniv_aead_decrypt_complete(struct crypto_async_request *base, | |
179 | int err) | |
180 | { | |
181 | struct aead_request *req = base->data; | |
182 | ||
183 | seqniv_aead_decrypt_complete2(req, err); | |
184 | aead_request_complete(req, err); | |
185 | } | |
186 | ||
14df4d80 HX |
187 | static void seqiv_geniv(struct seqiv_ctx *ctx, u8 *info, u64 seq, |
188 | unsigned int ivsize) | |
189 | { | |
190 | unsigned int len = ivsize; | |
191 | ||
192 | if (ivsize > sizeof(u64)) { | |
193 | memset(info, 0, ivsize - sizeof(u64)); | |
194 | len = sizeof(u64); | |
195 | } | |
196 | seq = cpu_to_be64(seq); | |
197 | memcpy(info + ivsize - len, &seq, len); | |
198 | crypto_xor(info, ctx->salt, ivsize); | |
199 | } | |
200 | ||
0a270321 HX |
201 | static int seqiv_givencrypt(struct skcipher_givcrypt_request *req) |
202 | { | |
203 | struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req); | |
204 | struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv); | |
205 | struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req); | |
3e3dc25f | 206 | crypto_completion_t compl; |
0a270321 HX |
207 | void *data; |
208 | u8 *info; | |
0a270321 | 209 | unsigned int ivsize; |
0a270321 HX |
210 | int err; |
211 | ||
212 | ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv)); | |
213 | ||
3e3dc25f | 214 | compl = req->creq.base.complete; |
0a270321 HX |
215 | data = req->creq.base.data; |
216 | info = req->creq.info; | |
217 | ||
218 | ivsize = crypto_ablkcipher_ivsize(geniv); | |
219 | ||
220 | if (unlikely(!IS_ALIGNED((unsigned long)info, | |
221 | crypto_ablkcipher_alignmask(geniv) + 1))) { | |
222 | info = kmalloc(ivsize, req->creq.base.flags & | |
223 | CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL: | |
224 | GFP_ATOMIC); | |
225 | if (!info) | |
226 | return -ENOMEM; | |
227 | ||
3e3dc25f | 228 | compl = seqiv_complete; |
0a270321 HX |
229 | data = req; |
230 | } | |
231 | ||
3e3dc25f | 232 | ablkcipher_request_set_callback(subreq, req->creq.base.flags, compl, |
0a270321 HX |
233 | data); |
234 | ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst, | |
235 | req->creq.nbytes, info); | |
236 | ||
14df4d80 | 237 | seqiv_geniv(ctx, info, req->seq, ivsize); |
0a270321 HX |
238 | memcpy(req->giv, info, ivsize); |
239 | ||
240 | err = crypto_ablkcipher_encrypt(subreq); | |
241 | if (unlikely(info != req->creq.info)) | |
242 | seqiv_complete2(req, err); | |
243 | return err; | |
244 | } | |
245 | ||
14df4d80 HX |
246 | static int seqiv_aead_givencrypt(struct aead_givcrypt_request *req) |
247 | { | |
248 | struct crypto_aead *geniv = aead_givcrypt_reqtfm(req); | |
249 | struct seqiv_ctx *ctx = crypto_aead_ctx(geniv); | |
250 | struct aead_request *areq = &req->areq; | |
251 | struct aead_request *subreq = aead_givcrypt_reqctx(req); | |
3e3dc25f | 252 | crypto_completion_t compl; |
14df4d80 HX |
253 | void *data; |
254 | u8 *info; | |
255 | unsigned int ivsize; | |
256 | int err; | |
257 | ||
258 | aead_request_set_tfm(subreq, aead_geniv_base(geniv)); | |
259 | ||
3e3dc25f | 260 | compl = areq->base.complete; |
14df4d80 HX |
261 | data = areq->base.data; |
262 | info = areq->iv; | |
263 | ||
264 | ivsize = crypto_aead_ivsize(geniv); | |
265 | ||
266 | if (unlikely(!IS_ALIGNED((unsigned long)info, | |
267 | crypto_aead_alignmask(geniv) + 1))) { | |
268 | info = kmalloc(ivsize, areq->base.flags & | |
269 | CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL: | |
270 | GFP_ATOMIC); | |
271 | if (!info) | |
272 | return -ENOMEM; | |
273 | ||
3e3dc25f | 274 | compl = seqiv_aead_complete; |
14df4d80 HX |
275 | data = req; |
276 | } | |
277 | ||
3e3dc25f | 278 | aead_request_set_callback(subreq, areq->base.flags, compl, data); |
14df4d80 HX |
279 | aead_request_set_crypt(subreq, areq->src, areq->dst, areq->cryptlen, |
280 | info); | |
281 | aead_request_set_assoc(subreq, areq->assoc, areq->assoclen); | |
282 | ||
283 | seqiv_geniv(ctx, info, req->seq, ivsize); | |
284 | memcpy(req->giv, info, ivsize); | |
285 | ||
286 | err = crypto_aead_encrypt(subreq); | |
287 | if (unlikely(info != areq->iv)) | |
288 | seqiv_aead_complete2(req, err); | |
289 | return err; | |
290 | } | |
291 | ||
856e3f40 HX |
292 | static int seqiv_aead_encrypt_compat(struct aead_request *req) |
293 | { | |
294 | struct crypto_aead *geniv = crypto_aead_reqtfm(req); | |
295 | struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv); | |
dd04446e HX |
296 | struct seqniv_request_ctx *rctx = aead_request_ctx(req); |
297 | struct aead_request *subreq = &rctx->subreq; | |
298 | struct scatterlist *dst; | |
856e3f40 HX |
299 | crypto_completion_t compl; |
300 | void *data; | |
dd04446e HX |
301 | unsigned int ivsize = 8; |
302 | u8 buf[20] __attribute__ ((aligned(__alignof__(u32)))); | |
856e3f40 HX |
303 | int err; |
304 | ||
dd04446e HX |
305 | if (req->cryptlen < ivsize) |
306 | return -EINVAL; | |
856e3f40 | 307 | |
dd04446e HX |
308 | /* ESP AD is at most 12 bytes (ESN). */ |
309 | if (req->assoclen > 12) | |
310 | return -EINVAL; | |
856e3f40 | 311 | |
dd04446e | 312 | aead_request_set_tfm(subreq, ctx->child); |
856e3f40 | 313 | |
dd04446e HX |
314 | compl = seqniv_aead_encrypt_complete; |
315 | data = req; | |
856e3f40 | 316 | |
dd04446e | 317 | if (req->src != req->dst) { |
dd04446e HX |
318 | struct blkcipher_desc desc = { |
319 | .tfm = ctx->null, | |
320 | }; | |
321 | ||
d0ad1b24 HX |
322 | err = crypto_blkcipher_encrypt(&desc, req->dst, req->src, |
323 | req->assoclen + req->cryptlen); | |
dd04446e HX |
324 | if (err) |
325 | return err; | |
856e3f40 HX |
326 | } |
327 | ||
dd04446e HX |
328 | dst = scatterwalk_ffwd(rctx->dst, req->dst, ivsize); |
329 | ||
856e3f40 | 330 | aead_request_set_callback(subreq, req->base.flags, compl, data); |
dd04446e HX |
331 | aead_request_set_crypt(subreq, dst, dst, |
332 | req->cryptlen - ivsize, req->iv); | |
374d4ad1 | 333 | aead_request_set_ad(subreq, req->assoclen); |
856e3f40 | 334 | |
dd04446e HX |
335 | memcpy(buf, req->iv, ivsize); |
336 | crypto_xor(buf, ctx->salt, ivsize); | |
337 | memcpy(req->iv, buf, ivsize); | |
338 | ||
339 | /* Swap order of IV and ESP AD for ICV generation. */ | |
340 | scatterwalk_map_and_copy(buf + ivsize, req->dst, 0, req->assoclen, 0); | |
341 | scatterwalk_map_and_copy(buf, req->dst, 0, req->assoclen + ivsize, 1); | |
856e3f40 HX |
342 | |
343 | err = crypto_aead_encrypt(subreq); | |
dd04446e | 344 | seqniv_aead_encrypt_complete2(req, err); |
856e3f40 HX |
345 | return err; |
346 | } | |
347 | ||
348 | static int seqiv_aead_encrypt(struct aead_request *req) | |
349 | { | |
350 | struct crypto_aead *geniv = crypto_aead_reqtfm(req); | |
351 | struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv); | |
352 | struct aead_request *subreq = aead_request_ctx(req); | |
353 | crypto_completion_t compl; | |
354 | void *data; | |
355 | u8 *info; | |
dd04446e | 356 | unsigned int ivsize = 8; |
856e3f40 HX |
357 | int err; |
358 | ||
dd04446e HX |
359 | if (req->cryptlen < ivsize) |
360 | return -EINVAL; | |
361 | ||
856e3f40 HX |
362 | aead_request_set_tfm(subreq, ctx->child); |
363 | ||
364 | compl = req->base.complete; | |
365 | data = req->base.data; | |
366 | info = req->iv; | |
367 | ||
856e3f40 | 368 | if (req->src != req->dst) { |
856e3f40 HX |
369 | struct blkcipher_desc desc = { |
370 | .tfm = ctx->null, | |
371 | }; | |
372 | ||
d0ad1b24 HX |
373 | err = crypto_blkcipher_encrypt(&desc, req->dst, req->src, |
374 | req->assoclen + req->cryptlen); | |
856e3f40 HX |
375 | if (err) |
376 | return err; | |
377 | } | |
378 | ||
379 | if (unlikely(!IS_ALIGNED((unsigned long)info, | |
380 | crypto_aead_alignmask(geniv) + 1))) { | |
381 | info = kmalloc(ivsize, req->base.flags & | |
382 | CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL: | |
383 | GFP_ATOMIC); | |
384 | if (!info) | |
385 | return -ENOMEM; | |
386 | ||
387 | memcpy(info, req->iv, ivsize); | |
388 | compl = seqiv_aead_encrypt_complete; | |
389 | data = req; | |
390 | } | |
391 | ||
392 | aead_request_set_callback(subreq, req->base.flags, compl, data); | |
393 | aead_request_set_crypt(subreq, req->dst, req->dst, | |
394 | req->cryptlen - ivsize, info); | |
374d4ad1 | 395 | aead_request_set_ad(subreq, req->assoclen + ivsize); |
856e3f40 HX |
396 | |
397 | crypto_xor(info, ctx->salt, ivsize); | |
398 | scatterwalk_map_and_copy(info, req->dst, req->assoclen, ivsize, 1); | |
399 | ||
400 | err = crypto_aead_encrypt(subreq); | |
401 | if (unlikely(info != req->iv)) | |
402 | seqiv_aead_encrypt_complete2(req, err); | |
403 | return err; | |
404 | } | |
405 | ||
406 | static int seqiv_aead_decrypt_compat(struct aead_request *req) | |
407 | { | |
408 | struct crypto_aead *geniv = crypto_aead_reqtfm(req); | |
409 | struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv); | |
dd04446e HX |
410 | struct seqniv_request_ctx *rctx = aead_request_ctx(req); |
411 | struct aead_request *subreq = &rctx->subreq; | |
412 | struct scatterlist *dst; | |
856e3f40 HX |
413 | crypto_completion_t compl; |
414 | void *data; | |
dd04446e HX |
415 | unsigned int ivsize = 8; |
416 | u8 buf[20]; | |
417 | int err; | |
418 | ||
419 | if (req->cryptlen < ivsize + crypto_aead_authsize(geniv)) | |
420 | return -EINVAL; | |
856e3f40 HX |
421 | |
422 | aead_request_set_tfm(subreq, ctx->child); | |
423 | ||
424 | compl = req->base.complete; | |
425 | data = req->base.data; | |
426 | ||
dd04446e HX |
427 | if (req->assoclen > 12) |
428 | return -EINVAL; | |
429 | else if (req->assoclen > 8) { | |
430 | compl = seqniv_aead_decrypt_complete; | |
431 | data = req; | |
432 | } | |
433 | ||
434 | if (req->src != req->dst) { | |
dd04446e HX |
435 | struct blkcipher_desc desc = { |
436 | .tfm = ctx->null, | |
437 | }; | |
438 | ||
d0ad1b24 HX |
439 | err = crypto_blkcipher_encrypt(&desc, req->dst, req->src, |
440 | req->assoclen + req->cryptlen); | |
dd04446e HX |
441 | if (err) |
442 | return err; | |
443 | } | |
444 | ||
445 | /* Move ESP AD forward for ICV generation. */ | |
446 | scatterwalk_map_and_copy(buf, req->dst, 0, req->assoclen + ivsize, 0); | |
447 | memcpy(req->iv, buf + req->assoclen, ivsize); | |
448 | scatterwalk_map_and_copy(buf, req->dst, ivsize, req->assoclen, 1); | |
449 | ||
450 | dst = scatterwalk_ffwd(rctx->dst, req->dst, ivsize); | |
856e3f40 HX |
451 | |
452 | aead_request_set_callback(subreq, req->base.flags, compl, data); | |
dd04446e | 453 | aead_request_set_crypt(subreq, dst, dst, |
856e3f40 | 454 | req->cryptlen - ivsize, req->iv); |
374d4ad1 | 455 | aead_request_set_ad(subreq, req->assoclen); |
856e3f40 | 456 | |
dd04446e HX |
457 | err = crypto_aead_decrypt(subreq); |
458 | if (req->assoclen > 8) | |
459 | seqniv_aead_decrypt_complete2(req, err); | |
460 | return err; | |
856e3f40 HX |
461 | } |
462 | ||
463 | static int seqiv_aead_decrypt(struct aead_request *req) | |
464 | { | |
465 | struct crypto_aead *geniv = crypto_aead_reqtfm(req); | |
466 | struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv); | |
467 | struct aead_request *subreq = aead_request_ctx(req); | |
468 | crypto_completion_t compl; | |
469 | void *data; | |
dd04446e HX |
470 | unsigned int ivsize = 8; |
471 | ||
472 | if (req->cryptlen < ivsize + crypto_aead_authsize(geniv)) | |
473 | return -EINVAL; | |
856e3f40 HX |
474 | |
475 | aead_request_set_tfm(subreq, ctx->child); | |
476 | ||
477 | compl = req->base.complete; | |
478 | data = req->base.data; | |
479 | ||
856e3f40 HX |
480 | aead_request_set_callback(subreq, req->base.flags, compl, data); |
481 | aead_request_set_crypt(subreq, req->src, req->dst, | |
482 | req->cryptlen - ivsize, req->iv); | |
374d4ad1 | 483 | aead_request_set_ad(subreq, req->assoclen + ivsize); |
856e3f40 HX |
484 | |
485 | scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0); | |
486 | if (req->src != req->dst) | |
487 | scatterwalk_map_and_copy(req->iv, req->dst, | |
488 | req->assoclen, ivsize, 1); | |
489 | ||
490 | return crypto_aead_decrypt(subreq); | |
491 | } | |
492 | ||
0a270321 HX |
493 | static int seqiv_givencrypt_first(struct skcipher_givcrypt_request *req) |
494 | { | |
495 | struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req); | |
496 | struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv); | |
a0f000ec | 497 | int err = 0; |
0a270321 HX |
498 | |
499 | spin_lock_bh(&ctx->lock); | |
500 | if (crypto_ablkcipher_crt(geniv)->givencrypt != seqiv_givencrypt_first) | |
501 | goto unlock; | |
502 | ||
503 | crypto_ablkcipher_crt(geniv)->givencrypt = seqiv_givencrypt; | |
a0f000ec HX |
504 | err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, |
505 | crypto_ablkcipher_ivsize(geniv)); | |
0a270321 HX |
506 | |
507 | unlock: | |
508 | spin_unlock_bh(&ctx->lock); | |
509 | ||
a0f000ec HX |
510 | if (err) |
511 | return err; | |
512 | ||
0a270321 HX |
513 | return seqiv_givencrypt(req); |
514 | } | |
515 | ||
14df4d80 HX |
516 | static int seqiv_aead_givencrypt_first(struct aead_givcrypt_request *req) |
517 | { | |
518 | struct crypto_aead *geniv = aead_givcrypt_reqtfm(req); | |
519 | struct seqiv_ctx *ctx = crypto_aead_ctx(geniv); | |
a0f000ec | 520 | int err = 0; |
14df4d80 HX |
521 | |
522 | spin_lock_bh(&ctx->lock); | |
523 | if (crypto_aead_crt(geniv)->givencrypt != seqiv_aead_givencrypt_first) | |
524 | goto unlock; | |
525 | ||
526 | crypto_aead_crt(geniv)->givencrypt = seqiv_aead_givencrypt; | |
a0f000ec HX |
527 | err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, |
528 | crypto_aead_ivsize(geniv)); | |
14df4d80 HX |
529 | |
530 | unlock: | |
531 | spin_unlock_bh(&ctx->lock); | |
532 | ||
a0f000ec HX |
533 | if (err) |
534 | return err; | |
535 | ||
14df4d80 HX |
536 | return seqiv_aead_givencrypt(req); |
537 | } | |
538 | ||
856e3f40 HX |
539 | static int seqiv_aead_encrypt_compat_first(struct aead_request *req) |
540 | { | |
541 | struct crypto_aead *geniv = crypto_aead_reqtfm(req); | |
542 | struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv); | |
543 | int err = 0; | |
544 | ||
545 | spin_lock_bh(&ctx->lock); | |
546 | if (geniv->encrypt != seqiv_aead_encrypt_compat_first) | |
547 | goto unlock; | |
548 | ||
549 | geniv->encrypt = seqiv_aead_encrypt_compat; | |
550 | err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, | |
551 | crypto_aead_ivsize(geniv)); | |
552 | ||
553 | unlock: | |
554 | spin_unlock_bh(&ctx->lock); | |
555 | ||
556 | if (err) | |
557 | return err; | |
558 | ||
559 | return seqiv_aead_encrypt_compat(req); | |
560 | } | |
561 | ||
562 | static int seqiv_aead_encrypt_first(struct aead_request *req) | |
563 | { | |
564 | struct crypto_aead *geniv = crypto_aead_reqtfm(req); | |
565 | struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv); | |
566 | int err = 0; | |
567 | ||
568 | spin_lock_bh(&ctx->lock); | |
569 | if (geniv->encrypt != seqiv_aead_encrypt_first) | |
570 | goto unlock; | |
571 | ||
572 | geniv->encrypt = seqiv_aead_encrypt; | |
573 | err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, | |
574 | crypto_aead_ivsize(geniv)); | |
575 | ||
576 | unlock: | |
577 | spin_unlock_bh(&ctx->lock); | |
578 | ||
579 | if (err) | |
580 | return err; | |
581 | ||
582 | return seqiv_aead_encrypt(req); | |
583 | } | |
584 | ||
0a270321 HX |
585 | static int seqiv_init(struct crypto_tfm *tfm) |
586 | { | |
587 | struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm); | |
588 | struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv); | |
589 | ||
590 | spin_lock_init(&ctx->lock); | |
591 | ||
592 | tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request); | |
593 | ||
594 | return skcipher_geniv_init(tfm); | |
595 | } | |
596 | ||
856e3f40 | 597 | static int seqiv_old_aead_init(struct crypto_tfm *tfm) |
14df4d80 HX |
598 | { |
599 | struct crypto_aead *geniv = __crypto_aead_cast(tfm); | |
600 | struct seqiv_ctx *ctx = crypto_aead_ctx(geniv); | |
601 | ||
602 | spin_lock_init(&ctx->lock); | |
603 | ||
ba6d8e39 HX |
604 | crypto_aead_set_reqsize(__crypto_aead_cast(tfm), |
605 | sizeof(struct aead_request)); | |
14df4d80 HX |
606 | |
607 | return aead_geniv_init(tfm); | |
608 | } | |
609 | ||
dd04446e | 610 | static int seqiv_aead_init_common(struct crypto_tfm *tfm, unsigned int reqsize) |
856e3f40 HX |
611 | { |
612 | struct crypto_aead *geniv = __crypto_aead_cast(tfm); | |
613 | struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv); | |
614 | int err; | |
615 | ||
616 | spin_lock_init(&ctx->lock); | |
617 | ||
618 | crypto_aead_set_reqsize(geniv, sizeof(struct aead_request)); | |
619 | ||
620 | ctx->null = crypto_get_default_null_skcipher(); | |
621 | err = PTR_ERR(ctx->null); | |
622 | if (IS_ERR(ctx->null)) | |
623 | goto out; | |
624 | ||
625 | err = aead_geniv_init(tfm); | |
626 | if (err) | |
627 | goto drop_null; | |
628 | ||
629 | ctx->child = geniv->child; | |
630 | geniv->child = geniv; | |
631 | ||
632 | out: | |
633 | return err; | |
634 | ||
635 | drop_null: | |
636 | crypto_put_default_null_skcipher(); | |
637 | goto out; | |
638 | } | |
639 | ||
dd04446e | 640 | static int seqiv_aead_init(struct crypto_tfm *tfm) |
856e3f40 | 641 | { |
dd04446e HX |
642 | return seqiv_aead_init_common(tfm, sizeof(struct aead_request)); |
643 | } | |
856e3f40 | 644 | |
dd04446e HX |
645 | static int seqniv_aead_init(struct crypto_tfm *tfm) |
646 | { | |
647 | return seqiv_aead_init_common(tfm, sizeof(struct seqniv_request_ctx)); | |
856e3f40 HX |
648 | } |
649 | ||
650 | static void seqiv_aead_exit(struct crypto_tfm *tfm) | |
651 | { | |
652 | struct seqiv_aead_ctx *ctx = crypto_tfm_ctx(tfm); | |
653 | ||
654 | crypto_free_aead(ctx->child); | |
655 | crypto_put_default_null_skcipher(); | |
656 | } | |
657 | ||
0677157b HX |
658 | static int seqiv_ablkcipher_create(struct crypto_template *tmpl, |
659 | struct rtattr **tb) | |
0a270321 HX |
660 | { |
661 | struct crypto_instance *inst; | |
0677157b | 662 | int err; |
0a270321 | 663 | |
0677157b | 664 | inst = skcipher_geniv_alloc(tmpl, tb, 0, 0); |
14df4d80 | 665 | |
0a270321 | 666 | if (IS_ERR(inst)) |
0677157b | 667 | return PTR_ERR(inst); |
0a270321 | 668 | |
0677157b HX |
669 | err = -EINVAL; |
670 | if (inst->alg.cra_ablkcipher.ivsize < sizeof(u64)) | |
671 | goto free_inst; | |
c0ecf891 | 672 | |
0a270321 HX |
673 | inst->alg.cra_ablkcipher.givencrypt = seqiv_givencrypt_first; |
674 | ||
675 | inst->alg.cra_init = seqiv_init; | |
676 | inst->alg.cra_exit = skcipher_geniv_exit; | |
677 | ||
0a270321 | 678 | inst->alg.cra_ctxsize += inst->alg.cra_ablkcipher.ivsize; |
856e3f40 | 679 | inst->alg.cra_ctxsize += sizeof(struct seqiv_ctx); |
0a270321 | 680 | |
0677157b HX |
681 | inst->alg.cra_alignmask |= __alignof__(u32) - 1; |
682 | ||
683 | err = crypto_register_instance(tmpl, inst); | |
684 | if (err) | |
685 | goto free_inst; | |
686 | ||
0a270321 | 687 | out: |
0677157b HX |
688 | return err; |
689 | ||
690 | free_inst: | |
691 | skcipher_geniv_free(inst); | |
692 | goto out; | |
0a270321 HX |
693 | } |
694 | ||
0677157b HX |
695 | static int seqiv_old_aead_create(struct crypto_template *tmpl, |
696 | struct aead_instance *aead) | |
856e3f40 HX |
697 | { |
698 | struct crypto_instance *inst = aead_crypto_instance(aead); | |
0677157b | 699 | int err = -EINVAL; |
856e3f40 | 700 | |
0677157b HX |
701 | if (inst->alg.cra_aead.ivsize < sizeof(u64)) |
702 | goto free_inst; | |
856e3f40 HX |
703 | |
704 | inst->alg.cra_aead.givencrypt = seqiv_aead_givencrypt_first; | |
705 | ||
706 | inst->alg.cra_init = seqiv_old_aead_init; | |
707 | inst->alg.cra_exit = aead_geniv_exit; | |
708 | ||
709 | inst->alg.cra_ctxsize = inst->alg.cra_aead.ivsize; | |
710 | inst->alg.cra_ctxsize += sizeof(struct seqiv_ctx); | |
711 | ||
0677157b HX |
712 | err = crypto_register_instance(tmpl, inst); |
713 | if (err) | |
714 | goto free_inst; | |
715 | ||
716 | out: | |
717 | return err; | |
718 | ||
719 | free_inst: | |
720 | aead_geniv_free(aead); | |
721 | goto out; | |
856e3f40 HX |
722 | } |
723 | ||
0677157b | 724 | static int seqiv_aead_create(struct crypto_template *tmpl, struct rtattr **tb) |
14df4d80 | 725 | { |
856e3f40 HX |
726 | struct aead_instance *inst; |
727 | struct crypto_aead_spawn *spawn; | |
728 | struct aead_alg *alg; | |
0677157b | 729 | int err; |
14df4d80 | 730 | |
0677157b | 731 | inst = aead_geniv_alloc(tmpl, tb, 0, 0); |
14df4d80 HX |
732 | |
733 | if (IS_ERR(inst)) | |
0677157b HX |
734 | return PTR_ERR(inst); |
735 | ||
736 | inst->alg.base.cra_alignmask |= __alignof__(u32) - 1; | |
14df4d80 | 737 | |
856e3f40 | 738 | if (inst->alg.base.cra_aead.encrypt) |
0677157b | 739 | return seqiv_old_aead_create(tmpl, inst); |
856e3f40 | 740 | |
0677157b | 741 | err = -EINVAL; |
dd04446e | 742 | if (inst->alg.ivsize != sizeof(u64)) |
0677157b | 743 | goto free_inst; |
c0ecf891 | 744 | |
856e3f40 HX |
745 | spawn = aead_instance_ctx(inst); |
746 | alg = crypto_spawn_aead_alg(spawn); | |
14df4d80 | 747 | |
856e3f40 HX |
748 | inst->alg.setkey = seqiv_aead_setkey; |
749 | inst->alg.setauthsize = seqiv_aead_setauthsize; | |
750 | inst->alg.encrypt = seqiv_aead_encrypt_first; | |
751 | inst->alg.decrypt = seqiv_aead_decrypt; | |
14df4d80 | 752 | |
856e3f40 HX |
753 | inst->alg.base.cra_init = seqiv_aead_init; |
754 | inst->alg.base.cra_exit = seqiv_aead_exit; | |
755 | ||
756 | inst->alg.base.cra_ctxsize = sizeof(struct seqiv_aead_ctx); | |
757 | inst->alg.base.cra_ctxsize += inst->alg.base.cra_aead.ivsize; | |
758 | ||
759 | if (alg->base.cra_aead.encrypt) { | |
760 | inst->alg.encrypt = seqiv_aead_encrypt_compat_first; | |
761 | inst->alg.decrypt = seqiv_aead_decrypt_compat; | |
762 | ||
dd04446e HX |
763 | inst->alg.base.cra_init = seqniv_aead_init; |
764 | inst->alg.base.cra_exit = seqiv_aead_exit; | |
856e3f40 | 765 | } |
14df4d80 | 766 | |
0677157b HX |
767 | err = aead_register_instance(tmpl, inst); |
768 | if (err) | |
769 | goto free_inst; | |
770 | ||
14df4d80 | 771 | out: |
0677157b HX |
772 | return err; |
773 | ||
774 | free_inst: | |
775 | aead_geniv_free(inst); | |
776 | goto out; | |
14df4d80 HX |
777 | } |
778 | ||
0677157b | 779 | static int seqiv_create(struct crypto_template *tmpl, struct rtattr **tb) |
14df4d80 HX |
780 | { |
781 | struct crypto_attr_type *algt; | |
14df4d80 HX |
782 | int err; |
783 | ||
784 | algt = crypto_get_attr_type(tb); | |
14df4d80 | 785 | if (IS_ERR(algt)) |
0677157b | 786 | return PTR_ERR(algt); |
14df4d80 | 787 | |
a0f000ec HX |
788 | err = crypto_get_default_rng(); |
789 | if (err) | |
0677157b | 790 | return err; |
a0f000ec | 791 | |
14df4d80 | 792 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) |
0677157b | 793 | err = seqiv_ablkcipher_create(tmpl, tb); |
14df4d80 | 794 | else |
0677157b | 795 | err = seqiv_aead_create(tmpl, tb); |
14df4d80 | 796 | |
0677157b HX |
797 | if (err) |
798 | crypto_put_default_rng(); | |
a0f000ec | 799 | |
0677157b | 800 | return err; |
14df4d80 HX |
801 | } |
802 | ||
0677157b | 803 | static int seqniv_create(struct crypto_template *tmpl, struct rtattr **tb) |
3c08fee7 HX |
804 | { |
805 | struct aead_instance *inst; | |
806 | struct crypto_aead_spawn *spawn; | |
807 | struct aead_alg *alg; | |
808 | int err; | |
809 | ||
810 | err = crypto_get_default_rng(); | |
811 | if (err) | |
0677157b | 812 | return err; |
3c08fee7 | 813 | |
0677157b HX |
814 | inst = aead_geniv_alloc(tmpl, tb, 0, 0); |
815 | err = PTR_ERR(inst); | |
3c08fee7 HX |
816 | if (IS_ERR(inst)) |
817 | goto put_rng; | |
818 | ||
0677157b | 819 | err = -EINVAL; |
dd04446e | 820 | if (inst->alg.ivsize != sizeof(u64)) |
0677157b | 821 | goto free_inst; |
3c08fee7 HX |
822 | |
823 | spawn = aead_instance_ctx(inst); | |
824 | alg = crypto_spawn_aead_alg(spawn); | |
825 | ||
826 | inst->alg.setkey = seqiv_aead_setkey; | |
827 | inst->alg.setauthsize = seqiv_aead_setauthsize; | |
828 | inst->alg.encrypt = seqiv_aead_encrypt_compat_first; | |
829 | inst->alg.decrypt = seqiv_aead_decrypt_compat; | |
830 | ||
dd04446e HX |
831 | inst->alg.base.cra_init = seqniv_aead_init; |
832 | inst->alg.base.cra_exit = seqiv_aead_exit; | |
3c08fee7 HX |
833 | |
834 | inst->alg.base.cra_alignmask |= __alignof__(u32) - 1; | |
835 | inst->alg.base.cra_ctxsize = sizeof(struct seqiv_aead_ctx); | |
836 | inst->alg.base.cra_ctxsize += inst->alg.base.cra_aead.ivsize; | |
837 | ||
0677157b HX |
838 | err = aead_register_instance(tmpl, inst); |
839 | if (err) | |
840 | goto free_inst; | |
841 | ||
3c08fee7 | 842 | out: |
0677157b | 843 | return err; |
3c08fee7 | 844 | |
0677157b HX |
845 | free_inst: |
846 | aead_geniv_free(inst); | |
3c08fee7 HX |
847 | put_rng: |
848 | crypto_put_default_rng(); | |
849 | goto out; | |
850 | } | |
851 | ||
14df4d80 HX |
852 | static void seqiv_free(struct crypto_instance *inst) |
853 | { | |
854 | if ((inst->alg.cra_flags ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) | |
855 | skcipher_geniv_free(inst); | |
856 | else | |
856e3f40 | 857 | aead_geniv_free(aead_instance(inst)); |
a0f000ec | 858 | crypto_put_default_rng(); |
14df4d80 HX |
859 | } |
860 | ||
0a270321 HX |
861 | static struct crypto_template seqiv_tmpl = { |
862 | .name = "seqiv", | |
0677157b | 863 | .create = seqiv_create, |
14df4d80 | 864 | .free = seqiv_free, |
0a270321 HX |
865 | .module = THIS_MODULE, |
866 | }; | |
867 | ||
3c08fee7 HX |
868 | static struct crypto_template seqniv_tmpl = { |
869 | .name = "seqniv", | |
0677157b | 870 | .create = seqniv_create, |
3c08fee7 HX |
871 | .free = seqiv_free, |
872 | .module = THIS_MODULE, | |
873 | }; | |
874 | ||
0a270321 HX |
875 | static int __init seqiv_module_init(void) |
876 | { | |
3c08fee7 HX |
877 | int err; |
878 | ||
879 | err = crypto_register_template(&seqiv_tmpl); | |
880 | if (err) | |
881 | goto out; | |
882 | ||
883 | err = crypto_register_template(&seqniv_tmpl); | |
884 | if (err) | |
885 | goto out_undo_niv; | |
886 | ||
887 | out: | |
888 | return err; | |
889 | ||
890 | out_undo_niv: | |
891 | crypto_unregister_template(&seqiv_tmpl); | |
892 | goto out; | |
0a270321 HX |
893 | } |
894 | ||
895 | static void __exit seqiv_module_exit(void) | |
896 | { | |
897 | crypto_unregister_template(&seqiv_tmpl); | |
898 | } | |
899 | ||
900 | module_init(seqiv_module_init); | |
901 | module_exit(seqiv_module_exit); | |
902 | ||
903 | MODULE_LICENSE("GPL"); | |
904 | MODULE_DESCRIPTION("Sequence Number IV Generator"); | |
4943ba16 | 905 | MODULE_ALIAS_CRYPTO("seqiv"); |
3c08fee7 | 906 | MODULE_ALIAS_CRYPTO("seqniv"); |