Commit | Line | Data |
---|---|---|
28db8e3e MH |
1 | /* |
2 | * GCM: Galois/Counter Mode. | |
3 | * | |
4 | * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License version 2 as published | |
8 | * by the Free Software Foundation. | |
9 | */ | |
10 | ||
28db8e3e | 11 | #include <crypto/gf128mul.h> |
dadbc53d | 12 | #include <crypto/internal/aead.h> |
1472e5eb | 13 | #include <crypto/internal/skcipher.h> |
9382d97a | 14 | #include <crypto/internal/hash.h> |
42c271c6 | 15 | #include <crypto/scatterwalk.h> |
9382d97a HY |
16 | #include <crypto/hash.h> |
17 | #include "internal.h" | |
84c91152 | 18 | #include <linux/completion.h> |
28db8e3e MH |
19 | #include <linux/err.h> |
20 | #include <linux/init.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/slab.h> | |
24 | ||
28db8e3e | 25 | struct gcm_instance_ctx { |
1472e5eb | 26 | struct crypto_skcipher_spawn ctr; |
9382d97a | 27 | struct crypto_ahash_spawn ghash; |
28db8e3e MH |
28 | }; |
29 | ||
30 | struct crypto_gcm_ctx { | |
31 | struct crypto_ablkcipher *ctr; | |
9382d97a | 32 | struct crypto_ahash *ghash; |
28db8e3e MH |
33 | }; |
34 | ||
dadbc53d HX |
35 | struct crypto_rfc4106_ctx { |
36 | struct crypto_aead *child; | |
37 | u8 nonce[4]; | |
38 | }; | |
39 | ||
73c89c15 TB |
40 | struct crypto_rfc4543_ctx { |
41 | struct crypto_aead *child; | |
42 | u8 nonce[4]; | |
43 | }; | |
44 | ||
45 | struct crypto_rfc4543_req_ctx { | |
46 | u8 auth_tag[16]; | |
d3dde522 | 47 | u8 assocbuf[32]; |
73c89c15 TB |
48 | struct scatterlist cipher[1]; |
49 | struct scatterlist payload[2]; | |
50 | struct scatterlist assoc[2]; | |
51 | struct aead_request subreq; | |
52 | }; | |
53 | ||
28db8e3e | 54 | struct crypto_gcm_ghash_ctx { |
9382d97a HY |
55 | unsigned int cryptlen; |
56 | struct scatterlist *src; | |
62c5593a | 57 | void (*complete)(struct aead_request *req, int err); |
28db8e3e MH |
58 | }; |
59 | ||
60 | struct crypto_gcm_req_priv_ctx { | |
61 | u8 auth_tag[16]; | |
6160b289 | 62 | u8 iauth_tag[16]; |
84c91152 HX |
63 | struct scatterlist src[2]; |
64 | struct scatterlist dst[2]; | |
9382d97a HY |
65 | struct crypto_gcm_ghash_ctx ghash_ctx; |
66 | union { | |
67 | struct ahash_request ahreq; | |
68 | struct ablkcipher_request abreq; | |
69 | } u; | |
28db8e3e MH |
70 | }; |
71 | ||
84c91152 HX |
72 | struct crypto_gcm_setkey_result { |
73 | int err; | |
74 | struct completion completion; | |
75 | }; | |
76 | ||
9382d97a HY |
77 | static void *gcm_zeroes; |
78 | ||
2589469d HX |
79 | static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx( |
80 | struct aead_request *req) | |
81 | { | |
82 | unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); | |
83 | ||
84 | return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); | |
85 | } | |
86 | ||
84c91152 | 87 | static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err) |
28db8e3e | 88 | { |
84c91152 | 89 | struct crypto_gcm_setkey_result *result = req->data; |
28db8e3e | 90 | |
84c91152 HX |
91 | if (err == -EINPROGRESS) |
92 | return; | |
93 | ||
94 | result->err = err; | |
95 | complete(&result->completion); | |
28db8e3e MH |
96 | } |
97 | ||
98 | static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key, | |
99 | unsigned int keylen) | |
100 | { | |
101 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); | |
9382d97a | 102 | struct crypto_ahash *ghash = ctx->ghash; |
28db8e3e | 103 | struct crypto_ablkcipher *ctr = ctx->ctr; |
84c91152 HX |
104 | struct { |
105 | be128 hash; | |
106 | u8 iv[8]; | |
107 | ||
108 | struct crypto_gcm_setkey_result result; | |
109 | ||
110 | struct scatterlist sg[1]; | |
111 | struct ablkcipher_request req; | |
112 | } *data; | |
113 | int err; | |
28db8e3e MH |
114 | |
115 | crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK); | |
116 | crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) & | |
117 | CRYPTO_TFM_REQ_MASK); | |
118 | ||
119 | err = crypto_ablkcipher_setkey(ctr, key, keylen); | |
120 | if (err) | |
84c91152 | 121 | return err; |
28db8e3e MH |
122 | |
123 | crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) & | |
124 | CRYPTO_TFM_RES_MASK); | |
125 | ||
84c91152 HX |
126 | data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr), |
127 | GFP_KERNEL); | |
128 | if (!data) | |
129 | return -ENOMEM; | |
130 | ||
131 | init_completion(&data->result.completion); | |
132 | sg_init_one(data->sg, &data->hash, sizeof(data->hash)); | |
133 | ablkcipher_request_set_tfm(&data->req, ctr); | |
134 | ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP | | |
135 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
136 | crypto_gcm_setkey_done, | |
137 | &data->result); | |
138 | ablkcipher_request_set_crypt(&data->req, data->sg, data->sg, | |
139 | sizeof(data->hash), data->iv); | |
140 | ||
141 | err = crypto_ablkcipher_encrypt(&data->req); | |
142 | if (err == -EINPROGRESS || err == -EBUSY) { | |
143 | err = wait_for_completion_interruptible( | |
144 | &data->result.completion); | |
145 | if (!err) | |
146 | err = data->result.err; | |
147 | } | |
148 | ||
28db8e3e MH |
149 | if (err) |
150 | goto out; | |
151 | ||
9382d97a HY |
152 | crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK); |
153 | crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) & | |
154 | CRYPTO_TFM_REQ_MASK); | |
155 | err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128)); | |
156 | crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) & | |
157 | CRYPTO_TFM_RES_MASK); | |
28db8e3e | 158 | |
84c91152 HX |
159 | out: |
160 | kfree(data); | |
28db8e3e MH |
161 | return err; |
162 | } | |
163 | ||
dadbc53d HX |
164 | static int crypto_gcm_setauthsize(struct crypto_aead *tfm, |
165 | unsigned int authsize) | |
166 | { | |
167 | switch (authsize) { | |
168 | case 4: | |
169 | case 8: | |
170 | case 12: | |
171 | case 13: | |
172 | case 14: | |
173 | case 15: | |
174 | case 16: | |
175 | break; | |
176 | default: | |
177 | return -EINVAL; | |
178 | } | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
84c91152 HX |
183 | static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req, |
184 | struct aead_request *req, | |
185 | unsigned int cryptlen) | |
28db8e3e MH |
186 | { |
187 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
188 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); | |
2589469d | 189 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
84c91152 HX |
190 | struct scatterlist *dst; |
191 | __be32 counter = cpu_to_be32(1); | |
192 | ||
193 | memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag)); | |
194 | memcpy(req->iv + 12, &counter, 4); | |
195 | ||
196 | sg_init_table(pctx->src, 2); | |
197 | sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag)); | |
198 | scatterwalk_sg_chain(pctx->src, 2, req->src); | |
199 | ||
200 | dst = pctx->src; | |
201 | if (req->src != req->dst) { | |
202 | sg_init_table(pctx->dst, 2); | |
203 | sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag)); | |
204 | scatterwalk_sg_chain(pctx->dst, 2, req->dst); | |
205 | dst = pctx->dst; | |
206 | } | |
28db8e3e MH |
207 | |
208 | ablkcipher_request_set_tfm(ablk_req, ctx->ctr); | |
84c91152 HX |
209 | ablkcipher_request_set_crypt(ablk_req, pctx->src, dst, |
210 | cryptlen + sizeof(pctx->auth_tag), | |
211 | req->iv); | |
9382d97a HY |
212 | } |
213 | ||
214 | static inline unsigned int gcm_remain(unsigned int len) | |
215 | { | |
216 | len &= 0xfU; | |
217 | return len ? 16 - len : 0; | |
218 | } | |
219 | ||
220 | static void gcm_hash_len_done(struct crypto_async_request *areq, int err); | |
221 | static void gcm_hash_final_done(struct crypto_async_request *areq, int err); | |
28db8e3e | 222 | |
9382d97a HY |
223 | static int gcm_hash_update(struct aead_request *req, |
224 | struct crypto_gcm_req_priv_ctx *pctx, | |
225 | crypto_completion_t complete, | |
226 | struct scatterlist *src, | |
227 | unsigned int len) | |
228 | { | |
229 | struct ahash_request *ahreq = &pctx->u.ahreq; | |
28db8e3e | 230 | |
9382d97a HY |
231 | ahash_request_set_callback(ahreq, aead_request_flags(req), |
232 | complete, req); | |
233 | ahash_request_set_crypt(ahreq, src, NULL, len); | |
234 | ||
235 | return crypto_ahash_update(ahreq); | |
28db8e3e MH |
236 | } |
237 | ||
9382d97a HY |
238 | static int gcm_hash_remain(struct aead_request *req, |
239 | struct crypto_gcm_req_priv_ctx *pctx, | |
240 | unsigned int remain, | |
241 | crypto_completion_t complete) | |
28db8e3e | 242 | { |
9382d97a HY |
243 | struct ahash_request *ahreq = &pctx->u.ahreq; |
244 | ||
245 | ahash_request_set_callback(ahreq, aead_request_flags(req), | |
246 | complete, req); | |
247 | sg_init_one(pctx->src, gcm_zeroes, remain); | |
248 | ahash_request_set_crypt(ahreq, pctx->src, NULL, remain); | |
249 | ||
250 | return crypto_ahash_update(ahreq); | |
251 | } | |
252 | ||
253 | static int gcm_hash_len(struct aead_request *req, | |
254 | struct crypto_gcm_req_priv_ctx *pctx) | |
255 | { | |
256 | struct ahash_request *ahreq = &pctx->u.ahreq; | |
257 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
258 | u128 lengths; | |
259 | ||
260 | lengths.a = cpu_to_be64(req->assoclen * 8); | |
261 | lengths.b = cpu_to_be64(gctx->cryptlen * 8); | |
262 | memcpy(pctx->iauth_tag, &lengths, 16); | |
263 | sg_init_one(pctx->src, pctx->iauth_tag, 16); | |
264 | ahash_request_set_callback(ahreq, aead_request_flags(req), | |
265 | gcm_hash_len_done, req); | |
266 | ahash_request_set_crypt(ahreq, pctx->src, | |
267 | NULL, sizeof(lengths)); | |
268 | ||
269 | return crypto_ahash_update(ahreq); | |
270 | } | |
271 | ||
272 | static int gcm_hash_final(struct aead_request *req, | |
273 | struct crypto_gcm_req_priv_ctx *pctx) | |
274 | { | |
275 | struct ahash_request *ahreq = &pctx->u.ahreq; | |
276 | ||
277 | ahash_request_set_callback(ahreq, aead_request_flags(req), | |
278 | gcm_hash_final_done, req); | |
279 | ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0); | |
280 | ||
281 | return crypto_ahash_final(ahreq); | |
282 | } | |
283 | ||
62c5593a | 284 | static void __gcm_hash_final_done(struct aead_request *req, int err) |
9382d97a | 285 | { |
2589469d | 286 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
287 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
288 | ||
289 | if (!err) | |
290 | crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16); | |
28db8e3e | 291 | |
62c5593a | 292 | gctx->complete(req, err); |
9382d97a HY |
293 | } |
294 | ||
62c5593a | 295 | static void gcm_hash_final_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
296 | { |
297 | struct aead_request *req = areq->data; | |
62c5593a HY |
298 | |
299 | __gcm_hash_final_done(req, err); | |
300 | } | |
301 | ||
302 | static void __gcm_hash_len_done(struct aead_request *req, int err) | |
303 | { | |
9382d97a HY |
304 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
305 | ||
306 | if (!err) { | |
307 | err = gcm_hash_final(req, pctx); | |
308 | if (err == -EINPROGRESS || err == -EBUSY) | |
309 | return; | |
310 | } | |
311 | ||
62c5593a | 312 | __gcm_hash_final_done(req, err); |
9382d97a HY |
313 | } |
314 | ||
62c5593a | 315 | static void gcm_hash_len_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
316 | { |
317 | struct aead_request *req = areq->data; | |
62c5593a HY |
318 | |
319 | __gcm_hash_len_done(req, err); | |
320 | } | |
321 | ||
322 | static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err) | |
323 | { | |
9382d97a HY |
324 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
325 | ||
326 | if (!err) { | |
327 | err = gcm_hash_len(req, pctx); | |
328 | if (err == -EINPROGRESS || err == -EBUSY) | |
329 | return; | |
330 | } | |
331 | ||
62c5593a | 332 | __gcm_hash_len_done(req, err); |
9382d97a HY |
333 | } |
334 | ||
62c5593a HY |
335 | static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq, |
336 | int err) | |
9382d97a HY |
337 | { |
338 | struct aead_request *req = areq->data; | |
62c5593a HY |
339 | |
340 | __gcm_hash_crypt_remain_done(req, err); | |
341 | } | |
342 | ||
343 | static void __gcm_hash_crypt_done(struct aead_request *req, int err) | |
344 | { | |
9382d97a HY |
345 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
346 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
347 | unsigned int remain; | |
348 | ||
349 | if (!err) { | |
350 | remain = gcm_remain(gctx->cryptlen); | |
351 | BUG_ON(!remain); | |
352 | err = gcm_hash_remain(req, pctx, remain, | |
353 | gcm_hash_crypt_remain_done); | |
354 | if (err == -EINPROGRESS || err == -EBUSY) | |
355 | return; | |
356 | } | |
357 | ||
62c5593a | 358 | __gcm_hash_crypt_remain_done(req, err); |
9382d97a HY |
359 | } |
360 | ||
62c5593a | 361 | static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
362 | { |
363 | struct aead_request *req = areq->data; | |
62c5593a HY |
364 | |
365 | __gcm_hash_crypt_done(req, err); | |
366 | } | |
367 | ||
368 | static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err) | |
369 | { | |
9382d97a HY |
370 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
371 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
372 | crypto_completion_t complete; | |
373 | unsigned int remain = 0; | |
374 | ||
375 | if (!err && gctx->cryptlen) { | |
376 | remain = gcm_remain(gctx->cryptlen); | |
377 | complete = remain ? gcm_hash_crypt_done : | |
378 | gcm_hash_crypt_remain_done; | |
379 | err = gcm_hash_update(req, pctx, complete, | |
380 | gctx->src, gctx->cryptlen); | |
381 | if (err == -EINPROGRESS || err == -EBUSY) | |
382 | return; | |
383 | } | |
384 | ||
385 | if (remain) | |
62c5593a | 386 | __gcm_hash_crypt_done(req, err); |
9382d97a | 387 | else |
62c5593a | 388 | __gcm_hash_crypt_remain_done(req, err); |
9382d97a HY |
389 | } |
390 | ||
62c5593a HY |
391 | static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq, |
392 | int err) | |
9382d97a HY |
393 | { |
394 | struct aead_request *req = areq->data; | |
62c5593a HY |
395 | |
396 | __gcm_hash_assoc_remain_done(req, err); | |
397 | } | |
398 | ||
399 | static void __gcm_hash_assoc_done(struct aead_request *req, int err) | |
400 | { | |
9382d97a HY |
401 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
402 | unsigned int remain; | |
403 | ||
404 | if (!err) { | |
405 | remain = gcm_remain(req->assoclen); | |
406 | BUG_ON(!remain); | |
407 | err = gcm_hash_remain(req, pctx, remain, | |
408 | gcm_hash_assoc_remain_done); | |
409 | if (err == -EINPROGRESS || err == -EBUSY) | |
410 | return; | |
411 | } | |
412 | ||
62c5593a | 413 | __gcm_hash_assoc_remain_done(req, err); |
9382d97a HY |
414 | } |
415 | ||
62c5593a | 416 | static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
417 | { |
418 | struct aead_request *req = areq->data; | |
62c5593a HY |
419 | |
420 | __gcm_hash_assoc_done(req, err); | |
421 | } | |
422 | ||
423 | static void __gcm_hash_init_done(struct aead_request *req, int err) | |
424 | { | |
9382d97a HY |
425 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
426 | crypto_completion_t complete; | |
427 | unsigned int remain = 0; | |
428 | ||
429 | if (!err && req->assoclen) { | |
430 | remain = gcm_remain(req->assoclen); | |
431 | complete = remain ? gcm_hash_assoc_done : | |
432 | gcm_hash_assoc_remain_done; | |
433 | err = gcm_hash_update(req, pctx, complete, | |
434 | req->assoc, req->assoclen); | |
435 | if (err == -EINPROGRESS || err == -EBUSY) | |
436 | return; | |
437 | } | |
438 | ||
439 | if (remain) | |
62c5593a | 440 | __gcm_hash_assoc_done(req, err); |
9382d97a | 441 | else |
62c5593a HY |
442 | __gcm_hash_assoc_remain_done(req, err); |
443 | } | |
444 | ||
445 | static void gcm_hash_init_done(struct crypto_async_request *areq, int err) | |
446 | { | |
447 | struct aead_request *req = areq->data; | |
448 | ||
449 | __gcm_hash_init_done(req, err); | |
9382d97a HY |
450 | } |
451 | ||
452 | static int gcm_hash(struct aead_request *req, | |
453 | struct crypto_gcm_req_priv_ctx *pctx) | |
454 | { | |
455 | struct ahash_request *ahreq = &pctx->u.ahreq; | |
456 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
457 | struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm); | |
458 | unsigned int remain; | |
459 | crypto_completion_t complete; | |
460 | int err; | |
461 | ||
462 | ahash_request_set_tfm(ahreq, ctx->ghash); | |
463 | ||
464 | ahash_request_set_callback(ahreq, aead_request_flags(req), | |
465 | gcm_hash_init_done, req); | |
466 | err = crypto_ahash_init(ahreq); | |
467 | if (err) | |
468 | return err; | |
469 | remain = gcm_remain(req->assoclen); | |
470 | complete = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done; | |
471 | err = gcm_hash_update(req, pctx, complete, req->assoc, req->assoclen); | |
472 | if (err) | |
473 | return err; | |
474 | if (remain) { | |
475 | err = gcm_hash_remain(req, pctx, remain, | |
476 | gcm_hash_assoc_remain_done); | |
477 | if (err) | |
478 | return err; | |
479 | } | |
480 | remain = gcm_remain(gctx->cryptlen); | |
481 | complete = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done; | |
482 | err = gcm_hash_update(req, pctx, complete, gctx->src, gctx->cryptlen); | |
483 | if (err) | |
484 | return err; | |
485 | if (remain) { | |
486 | err = gcm_hash_remain(req, pctx, remain, | |
487 | gcm_hash_crypt_remain_done); | |
488 | if (err) | |
489 | return err; | |
490 | } | |
491 | err = gcm_hash_len(req, pctx); | |
492 | if (err) | |
493 | return err; | |
494 | err = gcm_hash_final(req, pctx); | |
495 | if (err) | |
496 | return err; | |
497 | ||
498 | return 0; | |
499 | } | |
500 | ||
501 | static void gcm_enc_copy_hash(struct aead_request *req, | |
502 | struct crypto_gcm_req_priv_ctx *pctx) | |
503 | { | |
504 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
505 | u8 *auth_tag = pctx->auth_tag; | |
28db8e3e | 506 | |
6160b289 HX |
507 | scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen, |
508 | crypto_aead_authsize(aead), 1); | |
6160b289 HX |
509 | } |
510 | ||
62c5593a | 511 | static void gcm_enc_hash_done(struct aead_request *req, int err) |
6160b289 | 512 | { |
9382d97a | 513 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
6160b289 HX |
514 | |
515 | if (!err) | |
9382d97a | 516 | gcm_enc_copy_hash(req, pctx); |
6160b289 | 517 | |
28db8e3e MH |
518 | aead_request_complete(req, err); |
519 | } | |
520 | ||
62c5593a | 521 | static void gcm_encrypt_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
522 | { |
523 | struct aead_request *req = areq->data; | |
524 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); | |
525 | ||
526 | if (!err) { | |
527 | err = gcm_hash(req, pctx); | |
528 | if (err == -EINPROGRESS || err == -EBUSY) | |
529 | return; | |
62c5593a HY |
530 | else if (!err) { |
531 | crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16); | |
532 | gcm_enc_copy_hash(req, pctx); | |
533 | } | |
9382d97a HY |
534 | } |
535 | ||
62c5593a | 536 | aead_request_complete(req, err); |
9382d97a HY |
537 | } |
538 | ||
28db8e3e MH |
539 | static int crypto_gcm_encrypt(struct aead_request *req) |
540 | { | |
2589469d | 541 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
542 | struct ablkcipher_request *abreq = &pctx->u.abreq; |
543 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
84c91152 HX |
544 | int err; |
545 | ||
546 | crypto_gcm_init_crypt(abreq, req, req->cryptlen); | |
547 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
9382d97a HY |
548 | gcm_encrypt_done, req); |
549 | ||
550 | gctx->src = req->dst; | |
551 | gctx->cryptlen = req->cryptlen; | |
552 | gctx->complete = gcm_enc_hash_done; | |
28db8e3e | 553 | |
84c91152 | 554 | err = crypto_ablkcipher_encrypt(abreq); |
28db8e3e MH |
555 | if (err) |
556 | return err; | |
557 | ||
9382d97a HY |
558 | err = gcm_hash(req, pctx); |
559 | if (err) | |
560 | return err; | |
561 | ||
562 | crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16); | |
563 | gcm_enc_copy_hash(req, pctx); | |
564 | ||
565 | return 0; | |
28db8e3e MH |
566 | } |
567 | ||
9382d97a HY |
568 | static int crypto_gcm_verify(struct aead_request *req, |
569 | struct crypto_gcm_req_priv_ctx *pctx) | |
84c91152 HX |
570 | { |
571 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
84c91152 HX |
572 | u8 *auth_tag = pctx->auth_tag; |
573 | u8 *iauth_tag = pctx->iauth_tag; | |
574 | unsigned int authsize = crypto_aead_authsize(aead); | |
575 | unsigned int cryptlen = req->cryptlen - authsize; | |
576 | ||
9382d97a | 577 | crypto_xor(auth_tag, iauth_tag, 16); |
84c91152 HX |
578 | scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0); |
579 | return memcmp(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0; | |
580 | } | |
581 | ||
9382d97a | 582 | static void gcm_decrypt_done(struct crypto_async_request *areq, int err) |
28db8e3e | 583 | { |
84c91152 | 584 | struct aead_request *req = areq->data; |
9382d97a | 585 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
84c91152 HX |
586 | |
587 | if (!err) | |
9382d97a | 588 | err = crypto_gcm_verify(req, pctx); |
84c91152 HX |
589 | |
590 | aead_request_complete(req, err); | |
28db8e3e MH |
591 | } |
592 | ||
62c5593a | 593 | static void gcm_dec_hash_done(struct aead_request *req, int err) |
9382d97a | 594 | { |
9382d97a HY |
595 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
596 | struct ablkcipher_request *abreq = &pctx->u.abreq; | |
597 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
598 | ||
599 | if (!err) { | |
600 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
601 | gcm_decrypt_done, req); | |
602 | crypto_gcm_init_crypt(abreq, req, gctx->cryptlen); | |
603 | err = crypto_ablkcipher_decrypt(abreq); | |
604 | if (err == -EINPROGRESS || err == -EBUSY) | |
605 | return; | |
62c5593a HY |
606 | else if (!err) |
607 | err = crypto_gcm_verify(req, pctx); | |
9382d97a HY |
608 | } |
609 | ||
62c5593a | 610 | aead_request_complete(req, err); |
9382d97a HY |
611 | } |
612 | ||
28db8e3e MH |
613 | static int crypto_gcm_decrypt(struct aead_request *req) |
614 | { | |
6160b289 | 615 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
2589469d | 616 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
617 | struct ablkcipher_request *abreq = &pctx->u.abreq; |
618 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
6160b289 | 619 | unsigned int authsize = crypto_aead_authsize(aead); |
9382d97a | 620 | unsigned int cryptlen = req->cryptlen; |
28db8e3e MH |
621 | int err; |
622 | ||
6160b289 | 623 | if (cryptlen < authsize) |
28db8e3e | 624 | return -EINVAL; |
6160b289 | 625 | cryptlen -= authsize; |
28db8e3e | 626 | |
9382d97a HY |
627 | gctx->src = req->src; |
628 | gctx->cryptlen = cryptlen; | |
629 | gctx->complete = gcm_dec_hash_done; | |
28db8e3e | 630 | |
9382d97a HY |
631 | err = gcm_hash(req, pctx); |
632 | if (err) | |
633 | return err; | |
28db8e3e | 634 | |
9382d97a HY |
635 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
636 | gcm_decrypt_done, req); | |
637 | crypto_gcm_init_crypt(abreq, req, cryptlen); | |
84c91152 HX |
638 | err = crypto_ablkcipher_decrypt(abreq); |
639 | if (err) | |
640 | return err; | |
28db8e3e | 641 | |
9382d97a | 642 | return crypto_gcm_verify(req, pctx); |
28db8e3e MH |
643 | } |
644 | ||
645 | static int crypto_gcm_init_tfm(struct crypto_tfm *tfm) | |
646 | { | |
647 | struct crypto_instance *inst = (void *)tfm->__crt_alg; | |
648 | struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst); | |
649 | struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm); | |
650 | struct crypto_ablkcipher *ctr; | |
9382d97a | 651 | struct crypto_ahash *ghash; |
28db8e3e MH |
652 | unsigned long align; |
653 | int err; | |
654 | ||
9382d97a HY |
655 | ghash = crypto_spawn_ahash(&ictx->ghash); |
656 | if (IS_ERR(ghash)) | |
657 | return PTR_ERR(ghash); | |
658 | ||
1472e5eb | 659 | ctr = crypto_spawn_skcipher(&ictx->ctr); |
28db8e3e MH |
660 | err = PTR_ERR(ctr); |
661 | if (IS_ERR(ctr)) | |
9382d97a | 662 | goto err_free_hash; |
28db8e3e MH |
663 | |
664 | ctx->ctr = ctr; | |
9382d97a | 665 | ctx->ghash = ghash; |
28db8e3e | 666 | |
2589469d | 667 | align = crypto_tfm_alg_alignmask(tfm); |
28db8e3e | 668 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
7f681378 | 669 | tfm->crt_aead.reqsize = align + |
9382d97a HY |
670 | offsetof(struct crypto_gcm_req_priv_ctx, u) + |
671 | max(sizeof(struct ablkcipher_request) + | |
672 | crypto_ablkcipher_reqsize(ctr), | |
673 | sizeof(struct ahash_request) + | |
674 | crypto_ahash_reqsize(ghash)); | |
28db8e3e MH |
675 | |
676 | return 0; | |
9382d97a HY |
677 | |
678 | err_free_hash: | |
679 | crypto_free_ahash(ghash); | |
680 | return err; | |
28db8e3e MH |
681 | } |
682 | ||
683 | static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm) | |
684 | { | |
685 | struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm); | |
686 | ||
9382d97a | 687 | crypto_free_ahash(ctx->ghash); |
28db8e3e MH |
688 | crypto_free_ablkcipher(ctx->ctr); |
689 | } | |
690 | ||
d00aa19b HX |
691 | static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb, |
692 | const char *full_name, | |
9382d97a HY |
693 | const char *ctr_name, |
694 | const char *ghash_name) | |
28db8e3e | 695 | { |
d00aa19b | 696 | struct crypto_attr_type *algt; |
28db8e3e MH |
697 | struct crypto_instance *inst; |
698 | struct crypto_alg *ctr; | |
9382d97a HY |
699 | struct crypto_alg *ghash_alg; |
700 | struct ahash_alg *ghash_ahash_alg; | |
28db8e3e MH |
701 | struct gcm_instance_ctx *ctx; |
702 | int err; | |
28db8e3e | 703 | |
d00aa19b | 704 | algt = crypto_get_attr_type(tb); |
d00aa19b | 705 | if (IS_ERR(algt)) |
3e8afe35 | 706 | return ERR_CAST(algt); |
28db8e3e | 707 | |
d00aa19b HX |
708 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
709 | return ERR_PTR(-EINVAL); | |
28db8e3e | 710 | |
9382d97a HY |
711 | ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type, |
712 | CRYPTO_ALG_TYPE_HASH, | |
713 | CRYPTO_ALG_TYPE_AHASH_MASK); | |
9382d97a | 714 | if (IS_ERR(ghash_alg)) |
3e8afe35 | 715 | return ERR_CAST(ghash_alg); |
9382d97a HY |
716 | |
717 | err = -ENOMEM; | |
1472e5eb HX |
718 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
719 | if (!inst) | |
9382d97a | 720 | goto out_put_ghash; |
28db8e3e | 721 | |
1472e5eb | 722 | ctx = crypto_instance_ctx(inst); |
9382d97a HY |
723 | ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base); |
724 | err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg, | |
725 | inst); | |
726 | if (err) | |
727 | goto err_free_inst; | |
728 | ||
1472e5eb HX |
729 | crypto_set_skcipher_spawn(&ctx->ctr, inst); |
730 | err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0, | |
731 | crypto_requires_sync(algt->type, | |
732 | algt->mask)); | |
733 | if (err) | |
9382d97a | 734 | goto err_drop_ghash; |
1472e5eb HX |
735 | |
736 | ctr = crypto_skcipher_spawn_alg(&ctx->ctr); | |
28db8e3e | 737 | |
d00aa19b | 738 | /* We only support 16-byte blocks. */ |
1472e5eb | 739 | if (ctr->cra_ablkcipher.ivsize != 16) |
d00aa19b HX |
740 | goto out_put_ctr; |
741 | ||
742 | /* Not a stream cipher? */ | |
743 | err = -EINVAL; | |
744 | if (ctr->cra_blocksize != 1) | |
28db8e3e MH |
745 | goto out_put_ctr; |
746 | ||
28db8e3e | 747 | err = -ENAMETOOLONG; |
d00aa19b | 748 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
9382d97a HY |
749 | "gcm_base(%s,%s)", ctr->cra_driver_name, |
750 | ghash_alg->cra_driver_name) >= | |
d00aa19b | 751 | CRYPTO_MAX_ALG_NAME) |
1472e5eb | 752 | goto out_put_ctr; |
28db8e3e | 753 | |
d00aa19b HX |
754 | memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME); |
755 | ||
1472e5eb HX |
756 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; |
757 | inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC; | |
28db8e3e | 758 | inst->alg.cra_priority = ctr->cra_priority; |
d00aa19b | 759 | inst->alg.cra_blocksize = 1; |
2589469d | 760 | inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1); |
28db8e3e | 761 | inst->alg.cra_type = &crypto_aead_type; |
84c91152 | 762 | inst->alg.cra_aead.ivsize = 16; |
7ba683a6 | 763 | inst->alg.cra_aead.maxauthsize = 16; |
28db8e3e MH |
764 | inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx); |
765 | inst->alg.cra_init = crypto_gcm_init_tfm; | |
766 | inst->alg.cra_exit = crypto_gcm_exit_tfm; | |
767 | inst->alg.cra_aead.setkey = crypto_gcm_setkey; | |
dadbc53d | 768 | inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize; |
28db8e3e MH |
769 | inst->alg.cra_aead.encrypt = crypto_gcm_encrypt; |
770 | inst->alg.cra_aead.decrypt = crypto_gcm_decrypt; | |
771 | ||
772 | out: | |
9382d97a | 773 | crypto_mod_put(ghash_alg); |
28db8e3e | 774 | return inst; |
1472e5eb HX |
775 | |
776 | out_put_ctr: | |
777 | crypto_drop_skcipher(&ctx->ctr); | |
9382d97a HY |
778 | err_drop_ghash: |
779 | crypto_drop_ahash(&ctx->ghash); | |
28db8e3e MH |
780 | err_free_inst: |
781 | kfree(inst); | |
9382d97a | 782 | out_put_ghash: |
28db8e3e MH |
783 | inst = ERR_PTR(err); |
784 | goto out; | |
785 | } | |
786 | ||
d00aa19b HX |
787 | static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb) |
788 | { | |
d00aa19b HX |
789 | const char *cipher_name; |
790 | char ctr_name[CRYPTO_MAX_ALG_NAME]; | |
791 | char full_name[CRYPTO_MAX_ALG_NAME]; | |
792 | ||
793 | cipher_name = crypto_attr_alg_name(tb[1]); | |
d00aa19b | 794 | if (IS_ERR(cipher_name)) |
3e8afe35 | 795 | return ERR_CAST(cipher_name); |
d00aa19b HX |
796 | |
797 | if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >= | |
798 | CRYPTO_MAX_ALG_NAME) | |
799 | return ERR_PTR(-ENAMETOOLONG); | |
800 | ||
801 | if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >= | |
802 | CRYPTO_MAX_ALG_NAME) | |
803 | return ERR_PTR(-ENAMETOOLONG); | |
804 | ||
9382d97a | 805 | return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash"); |
d00aa19b HX |
806 | } |
807 | ||
28db8e3e MH |
808 | static void crypto_gcm_free(struct crypto_instance *inst) |
809 | { | |
810 | struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst); | |
811 | ||
1472e5eb | 812 | crypto_drop_skcipher(&ctx->ctr); |
9382d97a | 813 | crypto_drop_ahash(&ctx->ghash); |
28db8e3e MH |
814 | kfree(inst); |
815 | } | |
816 | ||
817 | static struct crypto_template crypto_gcm_tmpl = { | |
818 | .name = "gcm", | |
819 | .alloc = crypto_gcm_alloc, | |
820 | .free = crypto_gcm_free, | |
821 | .module = THIS_MODULE, | |
822 | }; | |
823 | ||
d00aa19b HX |
824 | static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb) |
825 | { | |
d00aa19b | 826 | const char *ctr_name; |
9382d97a | 827 | const char *ghash_name; |
d00aa19b HX |
828 | char full_name[CRYPTO_MAX_ALG_NAME]; |
829 | ||
830 | ctr_name = crypto_attr_alg_name(tb[1]); | |
d00aa19b | 831 | if (IS_ERR(ctr_name)) |
3e8afe35 | 832 | return ERR_CAST(ctr_name); |
d00aa19b | 833 | |
9382d97a | 834 | ghash_name = crypto_attr_alg_name(tb[2]); |
9382d97a | 835 | if (IS_ERR(ghash_name)) |
3e8afe35 | 836 | return ERR_CAST(ghash_name); |
9382d97a HY |
837 | |
838 | if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)", | |
839 | ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME) | |
d00aa19b HX |
840 | return ERR_PTR(-ENAMETOOLONG); |
841 | ||
9382d97a | 842 | return crypto_gcm_alloc_common(tb, full_name, ctr_name, ghash_name); |
d00aa19b HX |
843 | } |
844 | ||
845 | static struct crypto_template crypto_gcm_base_tmpl = { | |
846 | .name = "gcm_base", | |
847 | .alloc = crypto_gcm_base_alloc, | |
848 | .free = crypto_gcm_free, | |
849 | .module = THIS_MODULE, | |
850 | }; | |
851 | ||
dadbc53d HX |
852 | static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key, |
853 | unsigned int keylen) | |
854 | { | |
855 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); | |
856 | struct crypto_aead *child = ctx->child; | |
857 | int err; | |
858 | ||
859 | if (keylen < 4) | |
860 | return -EINVAL; | |
861 | ||
862 | keylen -= 4; | |
863 | memcpy(ctx->nonce, key + keylen, 4); | |
864 | ||
865 | crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
866 | crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & | |
867 | CRYPTO_TFM_REQ_MASK); | |
868 | err = crypto_aead_setkey(child, key, keylen); | |
869 | crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & | |
870 | CRYPTO_TFM_RES_MASK); | |
871 | ||
872 | return err; | |
873 | } | |
874 | ||
875 | static int crypto_rfc4106_setauthsize(struct crypto_aead *parent, | |
876 | unsigned int authsize) | |
877 | { | |
878 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); | |
879 | ||
880 | switch (authsize) { | |
881 | case 8: | |
882 | case 12: | |
883 | case 16: | |
884 | break; | |
885 | default: | |
886 | return -EINVAL; | |
887 | } | |
888 | ||
889 | return crypto_aead_setauthsize(ctx->child, authsize); | |
890 | } | |
891 | ||
892 | static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req) | |
893 | { | |
894 | struct aead_request *subreq = aead_request_ctx(req); | |
895 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
896 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead); | |
897 | struct crypto_aead *child = ctx->child; | |
898 | u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child), | |
899 | crypto_aead_alignmask(child) + 1); | |
900 | ||
901 | memcpy(iv, ctx->nonce, 4); | |
902 | memcpy(iv + 4, req->iv, 8); | |
903 | ||
904 | aead_request_set_tfm(subreq, child); | |
905 | aead_request_set_callback(subreq, req->base.flags, req->base.complete, | |
906 | req->base.data); | |
907 | aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv); | |
908 | aead_request_set_assoc(subreq, req->assoc, req->assoclen); | |
909 | ||
910 | return subreq; | |
911 | } | |
912 | ||
913 | static int crypto_rfc4106_encrypt(struct aead_request *req) | |
914 | { | |
915 | req = crypto_rfc4106_crypt(req); | |
916 | ||
917 | return crypto_aead_encrypt(req); | |
918 | } | |
919 | ||
920 | static int crypto_rfc4106_decrypt(struct aead_request *req) | |
921 | { | |
922 | req = crypto_rfc4106_crypt(req); | |
923 | ||
924 | return crypto_aead_decrypt(req); | |
925 | } | |
926 | ||
927 | static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm) | |
928 | { | |
929 | struct crypto_instance *inst = (void *)tfm->__crt_alg; | |
930 | struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst); | |
931 | struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm); | |
932 | struct crypto_aead *aead; | |
933 | unsigned long align; | |
934 | ||
935 | aead = crypto_spawn_aead(spawn); | |
936 | if (IS_ERR(aead)) | |
937 | return PTR_ERR(aead); | |
938 | ||
939 | ctx->child = aead; | |
940 | ||
941 | align = crypto_aead_alignmask(aead); | |
942 | align &= ~(crypto_tfm_ctx_alignment() - 1); | |
943 | tfm->crt_aead.reqsize = sizeof(struct aead_request) + | |
944 | ALIGN(crypto_aead_reqsize(aead), | |
945 | crypto_tfm_ctx_alignment()) + | |
946 | align + 16; | |
947 | ||
948 | return 0; | |
949 | } | |
950 | ||
951 | static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm) | |
952 | { | |
953 | struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm); | |
954 | ||
955 | crypto_free_aead(ctx->child); | |
956 | } | |
957 | ||
958 | static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb) | |
959 | { | |
960 | struct crypto_attr_type *algt; | |
961 | struct crypto_instance *inst; | |
962 | struct crypto_aead_spawn *spawn; | |
963 | struct crypto_alg *alg; | |
964 | const char *ccm_name; | |
965 | int err; | |
966 | ||
967 | algt = crypto_get_attr_type(tb); | |
dadbc53d | 968 | if (IS_ERR(algt)) |
3e8afe35 | 969 | return ERR_CAST(algt); |
dadbc53d HX |
970 | |
971 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) | |
972 | return ERR_PTR(-EINVAL); | |
973 | ||
974 | ccm_name = crypto_attr_alg_name(tb[1]); | |
dadbc53d | 975 | if (IS_ERR(ccm_name)) |
3e8afe35 | 976 | return ERR_CAST(ccm_name); |
dadbc53d HX |
977 | |
978 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
979 | if (!inst) | |
980 | return ERR_PTR(-ENOMEM); | |
981 | ||
982 | spawn = crypto_instance_ctx(inst); | |
983 | crypto_set_aead_spawn(spawn, inst); | |
984 | err = crypto_grab_aead(spawn, ccm_name, 0, | |
985 | crypto_requires_sync(algt->type, algt->mask)); | |
986 | if (err) | |
987 | goto out_free_inst; | |
988 | ||
989 | alg = crypto_aead_spawn_alg(spawn); | |
990 | ||
991 | err = -EINVAL; | |
992 | ||
993 | /* We only support 16-byte blocks. */ | |
994 | if (alg->cra_aead.ivsize != 16) | |
995 | goto out_drop_alg; | |
996 | ||
997 | /* Not a stream cipher? */ | |
998 | if (alg->cra_blocksize != 1) | |
999 | goto out_drop_alg; | |
1000 | ||
1001 | err = -ENAMETOOLONG; | |
1002 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, | |
1003 | "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME || | |
1004 | snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
1005 | "rfc4106(%s)", alg->cra_driver_name) >= | |
1006 | CRYPTO_MAX_ALG_NAME) | |
1007 | goto out_drop_alg; | |
1008 | ||
1009 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; | |
1010 | inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC; | |
1011 | inst->alg.cra_priority = alg->cra_priority; | |
1012 | inst->alg.cra_blocksize = 1; | |
1013 | inst->alg.cra_alignmask = alg->cra_alignmask; | |
1014 | inst->alg.cra_type = &crypto_nivaead_type; | |
1015 | ||
1016 | inst->alg.cra_aead.ivsize = 8; | |
1017 | inst->alg.cra_aead.maxauthsize = 16; | |
1018 | ||
1019 | inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx); | |
1020 | ||
1021 | inst->alg.cra_init = crypto_rfc4106_init_tfm; | |
1022 | inst->alg.cra_exit = crypto_rfc4106_exit_tfm; | |
1023 | ||
1024 | inst->alg.cra_aead.setkey = crypto_rfc4106_setkey; | |
1025 | inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize; | |
1026 | inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt; | |
1027 | inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt; | |
1028 | ||
1029 | inst->alg.cra_aead.geniv = "seqiv"; | |
1030 | ||
1031 | out: | |
1032 | return inst; | |
1033 | ||
1034 | out_drop_alg: | |
1035 | crypto_drop_aead(spawn); | |
1036 | out_free_inst: | |
1037 | kfree(inst); | |
1038 | inst = ERR_PTR(err); | |
1039 | goto out; | |
1040 | } | |
1041 | ||
1042 | static void crypto_rfc4106_free(struct crypto_instance *inst) | |
1043 | { | |
1044 | crypto_drop_spawn(crypto_instance_ctx(inst)); | |
1045 | kfree(inst); | |
1046 | } | |
1047 | ||
1048 | static struct crypto_template crypto_rfc4106_tmpl = { | |
1049 | .name = "rfc4106", | |
1050 | .alloc = crypto_rfc4106_alloc, | |
1051 | .free = crypto_rfc4106_free, | |
1052 | .module = THIS_MODULE, | |
1053 | }; | |
1054 | ||
73c89c15 TB |
1055 | static inline struct crypto_rfc4543_req_ctx *crypto_rfc4543_reqctx( |
1056 | struct aead_request *req) | |
1057 | { | |
1058 | unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); | |
1059 | ||
1060 | return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); | |
1061 | } | |
1062 | ||
1063 | static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key, | |
1064 | unsigned int keylen) | |
1065 | { | |
1066 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent); | |
1067 | struct crypto_aead *child = ctx->child; | |
1068 | int err; | |
1069 | ||
1070 | if (keylen < 4) | |
1071 | return -EINVAL; | |
1072 | ||
1073 | keylen -= 4; | |
1074 | memcpy(ctx->nonce, key + keylen, 4); | |
1075 | ||
1076 | crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
1077 | crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & | |
1078 | CRYPTO_TFM_REQ_MASK); | |
1079 | err = crypto_aead_setkey(child, key, keylen); | |
1080 | crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & | |
1081 | CRYPTO_TFM_RES_MASK); | |
1082 | ||
1083 | return err; | |
1084 | } | |
1085 | ||
1086 | static int crypto_rfc4543_setauthsize(struct crypto_aead *parent, | |
1087 | unsigned int authsize) | |
1088 | { | |
1089 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent); | |
1090 | ||
1091 | if (authsize != 16) | |
1092 | return -EINVAL; | |
1093 | ||
1094 | return crypto_aead_setauthsize(ctx->child, authsize); | |
1095 | } | |
1096 | ||
73c89c15 TB |
1097 | static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req, |
1098 | int enc) | |
1099 | { | |
1100 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
1101 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead); | |
1102 | struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req); | |
1103 | struct aead_request *subreq = &rctx->subreq; | |
1104 | struct scatterlist *dst = req->dst; | |
1105 | struct scatterlist *cipher = rctx->cipher; | |
1106 | struct scatterlist *payload = rctx->payload; | |
1107 | struct scatterlist *assoc = rctx->assoc; | |
1108 | unsigned int authsize = crypto_aead_authsize(aead); | |
1109 | unsigned int assoclen = req->assoclen; | |
1110 | struct page *dstp; | |
1111 | u8 *vdst; | |
1112 | u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child), | |
1113 | crypto_aead_alignmask(ctx->child) + 1); | |
1114 | ||
1115 | memcpy(iv, ctx->nonce, 4); | |
1116 | memcpy(iv + 4, req->iv, 8); | |
1117 | ||
1118 | /* construct cipher/plaintext */ | |
1119 | if (enc) | |
1120 | memset(rctx->auth_tag, 0, authsize); | |
1121 | else | |
1122 | scatterwalk_map_and_copy(rctx->auth_tag, dst, | |
1123 | req->cryptlen - authsize, | |
1124 | authsize, 0); | |
1125 | ||
1126 | sg_init_one(cipher, rctx->auth_tag, authsize); | |
1127 | ||
1128 | /* construct the aad */ | |
1129 | dstp = sg_page(dst); | |
1130 | vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset; | |
1131 | ||
1132 | sg_init_table(payload, 2); | |
1133 | sg_set_buf(payload, req->iv, 8); | |
c920fa60 | 1134 | scatterwalk_crypto_chain(payload, dst, vdst == req->iv + 8, 2); |
73c89c15 TB |
1135 | assoclen += 8 + req->cryptlen - (enc ? 0 : authsize); |
1136 | ||
d3dde522 JK |
1137 | if (req->assoc->length == req->assoclen) { |
1138 | sg_init_table(assoc, 2); | |
1139 | sg_set_page(assoc, sg_page(req->assoc), req->assoc->length, | |
1140 | req->assoc->offset); | |
1141 | } else { | |
1142 | BUG_ON(req->assoclen > sizeof(rctx->assocbuf)); | |
1143 | ||
1144 | scatterwalk_map_and_copy(rctx->assocbuf, req->assoc, 0, | |
1145 | req->assoclen, 0); | |
1146 | ||
1147 | sg_init_table(assoc, 2); | |
1148 | sg_set_buf(assoc, rctx->assocbuf, req->assoclen); | |
1149 | } | |
c920fa60 | 1150 | scatterwalk_crypto_chain(assoc, payload, 0, 2); |
73c89c15 TB |
1151 | |
1152 | aead_request_set_tfm(subreq, ctx->child); | |
1153 | aead_request_set_callback(subreq, req->base.flags, req->base.complete, | |
1154 | req->base.data); | |
1155 | aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv); | |
1156 | aead_request_set_assoc(subreq, assoc, assoclen); | |
1157 | ||
1158 | return subreq; | |
1159 | } | |
1160 | ||
1161 | static int crypto_rfc4543_encrypt(struct aead_request *req) | |
1162 | { | |
1163 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
1164 | struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req); | |
1165 | struct aead_request *subreq; | |
1166 | int err; | |
1167 | ||
1168 | subreq = crypto_rfc4543_crypt(req, 1); | |
1169 | err = crypto_aead_encrypt(subreq); | |
1170 | if (err) | |
1171 | return err; | |
1172 | ||
1173 | scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen, | |
1174 | crypto_aead_authsize(aead), 1); | |
1175 | ||
1176 | return 0; | |
1177 | } | |
1178 | ||
1179 | static int crypto_rfc4543_decrypt(struct aead_request *req) | |
1180 | { | |
1181 | req = crypto_rfc4543_crypt(req, 0); | |
1182 | ||
1183 | return crypto_aead_decrypt(req); | |
1184 | } | |
1185 | ||
1186 | static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm) | |
1187 | { | |
1188 | struct crypto_instance *inst = (void *)tfm->__crt_alg; | |
1189 | struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst); | |
1190 | struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm); | |
1191 | struct crypto_aead *aead; | |
1192 | unsigned long align; | |
1193 | ||
1194 | aead = crypto_spawn_aead(spawn); | |
1195 | if (IS_ERR(aead)) | |
1196 | return PTR_ERR(aead); | |
1197 | ||
1198 | ctx->child = aead; | |
1199 | ||
1200 | align = crypto_aead_alignmask(aead); | |
1201 | align &= ~(crypto_tfm_ctx_alignment() - 1); | |
1202 | tfm->crt_aead.reqsize = sizeof(struct crypto_rfc4543_req_ctx) + | |
1203 | ALIGN(crypto_aead_reqsize(aead), | |
1204 | crypto_tfm_ctx_alignment()) + | |
1205 | align + 16; | |
1206 | ||
1207 | return 0; | |
1208 | } | |
1209 | ||
1210 | static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm) | |
1211 | { | |
1212 | struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm); | |
1213 | ||
1214 | crypto_free_aead(ctx->child); | |
1215 | } | |
1216 | ||
1217 | static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb) | |
1218 | { | |
1219 | struct crypto_attr_type *algt; | |
1220 | struct crypto_instance *inst; | |
1221 | struct crypto_aead_spawn *spawn; | |
1222 | struct crypto_alg *alg; | |
1223 | const char *ccm_name; | |
1224 | int err; | |
1225 | ||
1226 | algt = crypto_get_attr_type(tb); | |
73c89c15 | 1227 | if (IS_ERR(algt)) |
3e8afe35 | 1228 | return ERR_CAST(algt); |
73c89c15 TB |
1229 | |
1230 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) | |
1231 | return ERR_PTR(-EINVAL); | |
1232 | ||
1233 | ccm_name = crypto_attr_alg_name(tb[1]); | |
73c89c15 | 1234 | if (IS_ERR(ccm_name)) |
3e8afe35 | 1235 | return ERR_CAST(ccm_name); |
73c89c15 TB |
1236 | |
1237 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
1238 | if (!inst) | |
1239 | return ERR_PTR(-ENOMEM); | |
1240 | ||
1241 | spawn = crypto_instance_ctx(inst); | |
1242 | crypto_set_aead_spawn(spawn, inst); | |
1243 | err = crypto_grab_aead(spawn, ccm_name, 0, | |
1244 | crypto_requires_sync(algt->type, algt->mask)); | |
1245 | if (err) | |
1246 | goto out_free_inst; | |
1247 | ||
1248 | alg = crypto_aead_spawn_alg(spawn); | |
1249 | ||
1250 | err = -EINVAL; | |
1251 | ||
1252 | /* We only support 16-byte blocks. */ | |
1253 | if (alg->cra_aead.ivsize != 16) | |
1254 | goto out_drop_alg; | |
1255 | ||
1256 | /* Not a stream cipher? */ | |
1257 | if (alg->cra_blocksize != 1) | |
1258 | goto out_drop_alg; | |
1259 | ||
1260 | err = -ENAMETOOLONG; | |
1261 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, | |
1262 | "rfc4543(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME || | |
1263 | snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
1264 | "rfc4543(%s)", alg->cra_driver_name) >= | |
1265 | CRYPTO_MAX_ALG_NAME) | |
1266 | goto out_drop_alg; | |
1267 | ||
1268 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; | |
1269 | inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC; | |
1270 | inst->alg.cra_priority = alg->cra_priority; | |
1271 | inst->alg.cra_blocksize = 1; | |
1272 | inst->alg.cra_alignmask = alg->cra_alignmask; | |
1273 | inst->alg.cra_type = &crypto_nivaead_type; | |
1274 | ||
1275 | inst->alg.cra_aead.ivsize = 8; | |
1276 | inst->alg.cra_aead.maxauthsize = 16; | |
1277 | ||
1278 | inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx); | |
1279 | ||
1280 | inst->alg.cra_init = crypto_rfc4543_init_tfm; | |
1281 | inst->alg.cra_exit = crypto_rfc4543_exit_tfm; | |
1282 | ||
1283 | inst->alg.cra_aead.setkey = crypto_rfc4543_setkey; | |
1284 | inst->alg.cra_aead.setauthsize = crypto_rfc4543_setauthsize; | |
1285 | inst->alg.cra_aead.encrypt = crypto_rfc4543_encrypt; | |
1286 | inst->alg.cra_aead.decrypt = crypto_rfc4543_decrypt; | |
1287 | ||
1288 | inst->alg.cra_aead.geniv = "seqiv"; | |
1289 | ||
1290 | out: | |
1291 | return inst; | |
1292 | ||
1293 | out_drop_alg: | |
1294 | crypto_drop_aead(spawn); | |
1295 | out_free_inst: | |
1296 | kfree(inst); | |
1297 | inst = ERR_PTR(err); | |
1298 | goto out; | |
1299 | } | |
1300 | ||
1301 | static void crypto_rfc4543_free(struct crypto_instance *inst) | |
1302 | { | |
1303 | crypto_drop_spawn(crypto_instance_ctx(inst)); | |
1304 | kfree(inst); | |
1305 | } | |
1306 | ||
1307 | static struct crypto_template crypto_rfc4543_tmpl = { | |
1308 | .name = "rfc4543", | |
1309 | .alloc = crypto_rfc4543_alloc, | |
1310 | .free = crypto_rfc4543_free, | |
1311 | .module = THIS_MODULE, | |
1312 | }; | |
1313 | ||
28db8e3e MH |
1314 | static int __init crypto_gcm_module_init(void) |
1315 | { | |
d00aa19b HX |
1316 | int err; |
1317 | ||
9382d97a HY |
1318 | gcm_zeroes = kzalloc(16, GFP_KERNEL); |
1319 | if (!gcm_zeroes) | |
1320 | return -ENOMEM; | |
1321 | ||
d00aa19b HX |
1322 | err = crypto_register_template(&crypto_gcm_base_tmpl); |
1323 | if (err) | |
1324 | goto out; | |
1325 | ||
1326 | err = crypto_register_template(&crypto_gcm_tmpl); | |
1327 | if (err) | |
1328 | goto out_undo_base; | |
1329 | ||
dadbc53d HX |
1330 | err = crypto_register_template(&crypto_rfc4106_tmpl); |
1331 | if (err) | |
1332 | goto out_undo_gcm; | |
1333 | ||
73c89c15 TB |
1334 | err = crypto_register_template(&crypto_rfc4543_tmpl); |
1335 | if (err) | |
1336 | goto out_undo_rfc4106; | |
1337 | ||
9382d97a | 1338 | return 0; |
d00aa19b | 1339 | |
73c89c15 TB |
1340 | out_undo_rfc4106: |
1341 | crypto_unregister_template(&crypto_rfc4106_tmpl); | |
dadbc53d HX |
1342 | out_undo_gcm: |
1343 | crypto_unregister_template(&crypto_gcm_tmpl); | |
d00aa19b HX |
1344 | out_undo_base: |
1345 | crypto_unregister_template(&crypto_gcm_base_tmpl); | |
9382d97a HY |
1346 | out: |
1347 | kfree(gcm_zeroes); | |
1348 | return err; | |
28db8e3e MH |
1349 | } |
1350 | ||
1351 | static void __exit crypto_gcm_module_exit(void) | |
1352 | { | |
9382d97a | 1353 | kfree(gcm_zeroes); |
73c89c15 | 1354 | crypto_unregister_template(&crypto_rfc4543_tmpl); |
dadbc53d | 1355 | crypto_unregister_template(&crypto_rfc4106_tmpl); |
28db8e3e | 1356 | crypto_unregister_template(&crypto_gcm_tmpl); |
d00aa19b | 1357 | crypto_unregister_template(&crypto_gcm_base_tmpl); |
28db8e3e MH |
1358 | } |
1359 | ||
1360 | module_init(crypto_gcm_module_init); | |
1361 | module_exit(crypto_gcm_module_exit); | |
1362 | ||
1363 | MODULE_LICENSE("GPL"); | |
1364 | MODULE_DESCRIPTION("Galois/Counter Mode"); | |
1365 | MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>"); | |
d00aa19b | 1366 | MODULE_ALIAS("gcm_base"); |
dadbc53d | 1367 | MODULE_ALIAS("rfc4106"); |
73c89c15 | 1368 | MODULE_ALIAS("rfc4543"); |