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 | ||
28db8e3e | 40 | struct crypto_gcm_ghash_ctx { |
9382d97a HY |
41 | unsigned int cryptlen; |
42 | struct scatterlist *src; | |
62c5593a | 43 | void (*complete)(struct aead_request *req, int err); |
28db8e3e MH |
44 | }; |
45 | ||
46 | struct crypto_gcm_req_priv_ctx { | |
47 | u8 auth_tag[16]; | |
6160b289 | 48 | u8 iauth_tag[16]; |
84c91152 HX |
49 | struct scatterlist src[2]; |
50 | struct scatterlist dst[2]; | |
9382d97a HY |
51 | struct crypto_gcm_ghash_ctx ghash_ctx; |
52 | union { | |
53 | struct ahash_request ahreq; | |
54 | struct ablkcipher_request abreq; | |
55 | } u; | |
28db8e3e MH |
56 | }; |
57 | ||
84c91152 HX |
58 | struct crypto_gcm_setkey_result { |
59 | int err; | |
60 | struct completion completion; | |
61 | }; | |
62 | ||
9382d97a HY |
63 | static void *gcm_zeroes; |
64 | ||
2589469d HX |
65 | static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx( |
66 | struct aead_request *req) | |
67 | { | |
68 | unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); | |
69 | ||
70 | return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); | |
71 | } | |
72 | ||
84c91152 | 73 | static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err) |
28db8e3e | 74 | { |
84c91152 | 75 | struct crypto_gcm_setkey_result *result = req->data; |
28db8e3e | 76 | |
84c91152 HX |
77 | if (err == -EINPROGRESS) |
78 | return; | |
79 | ||
80 | result->err = err; | |
81 | complete(&result->completion); | |
28db8e3e MH |
82 | } |
83 | ||
84 | static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key, | |
85 | unsigned int keylen) | |
86 | { | |
87 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); | |
9382d97a | 88 | struct crypto_ahash *ghash = ctx->ghash; |
28db8e3e | 89 | struct crypto_ablkcipher *ctr = ctx->ctr; |
84c91152 HX |
90 | struct { |
91 | be128 hash; | |
92 | u8 iv[8]; | |
93 | ||
94 | struct crypto_gcm_setkey_result result; | |
95 | ||
96 | struct scatterlist sg[1]; | |
97 | struct ablkcipher_request req; | |
98 | } *data; | |
99 | int err; | |
28db8e3e MH |
100 | |
101 | crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK); | |
102 | crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) & | |
103 | CRYPTO_TFM_REQ_MASK); | |
104 | ||
105 | err = crypto_ablkcipher_setkey(ctr, key, keylen); | |
106 | if (err) | |
84c91152 | 107 | return err; |
28db8e3e MH |
108 | |
109 | crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) & | |
110 | CRYPTO_TFM_RES_MASK); | |
111 | ||
84c91152 HX |
112 | data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr), |
113 | GFP_KERNEL); | |
114 | if (!data) | |
115 | return -ENOMEM; | |
116 | ||
117 | init_completion(&data->result.completion); | |
118 | sg_init_one(data->sg, &data->hash, sizeof(data->hash)); | |
119 | ablkcipher_request_set_tfm(&data->req, ctr); | |
120 | ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP | | |
121 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
122 | crypto_gcm_setkey_done, | |
123 | &data->result); | |
124 | ablkcipher_request_set_crypt(&data->req, data->sg, data->sg, | |
125 | sizeof(data->hash), data->iv); | |
126 | ||
127 | err = crypto_ablkcipher_encrypt(&data->req); | |
128 | if (err == -EINPROGRESS || err == -EBUSY) { | |
129 | err = wait_for_completion_interruptible( | |
130 | &data->result.completion); | |
131 | if (!err) | |
132 | err = data->result.err; | |
133 | } | |
134 | ||
28db8e3e MH |
135 | if (err) |
136 | goto out; | |
137 | ||
9382d97a HY |
138 | crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK); |
139 | crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) & | |
140 | CRYPTO_TFM_REQ_MASK); | |
141 | err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128)); | |
142 | crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) & | |
143 | CRYPTO_TFM_RES_MASK); | |
28db8e3e | 144 | |
84c91152 HX |
145 | out: |
146 | kfree(data); | |
28db8e3e MH |
147 | return err; |
148 | } | |
149 | ||
dadbc53d HX |
150 | static int crypto_gcm_setauthsize(struct crypto_aead *tfm, |
151 | unsigned int authsize) | |
152 | { | |
153 | switch (authsize) { | |
154 | case 4: | |
155 | case 8: | |
156 | case 12: | |
157 | case 13: | |
158 | case 14: | |
159 | case 15: | |
160 | case 16: | |
161 | break; | |
162 | default: | |
163 | return -EINVAL; | |
164 | } | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
84c91152 HX |
169 | static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req, |
170 | struct aead_request *req, | |
171 | unsigned int cryptlen) | |
28db8e3e MH |
172 | { |
173 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
174 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); | |
2589469d | 175 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
84c91152 HX |
176 | struct scatterlist *dst; |
177 | __be32 counter = cpu_to_be32(1); | |
178 | ||
179 | memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag)); | |
180 | memcpy(req->iv + 12, &counter, 4); | |
181 | ||
182 | sg_init_table(pctx->src, 2); | |
183 | sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag)); | |
184 | scatterwalk_sg_chain(pctx->src, 2, req->src); | |
185 | ||
186 | dst = pctx->src; | |
187 | if (req->src != req->dst) { | |
188 | sg_init_table(pctx->dst, 2); | |
189 | sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag)); | |
190 | scatterwalk_sg_chain(pctx->dst, 2, req->dst); | |
191 | dst = pctx->dst; | |
192 | } | |
28db8e3e MH |
193 | |
194 | ablkcipher_request_set_tfm(ablk_req, ctx->ctr); | |
84c91152 HX |
195 | ablkcipher_request_set_crypt(ablk_req, pctx->src, dst, |
196 | cryptlen + sizeof(pctx->auth_tag), | |
197 | req->iv); | |
9382d97a HY |
198 | } |
199 | ||
200 | static inline unsigned int gcm_remain(unsigned int len) | |
201 | { | |
202 | len &= 0xfU; | |
203 | return len ? 16 - len : 0; | |
204 | } | |
205 | ||
206 | static void gcm_hash_len_done(struct crypto_async_request *areq, int err); | |
207 | static void gcm_hash_final_done(struct crypto_async_request *areq, int err); | |
28db8e3e | 208 | |
9382d97a HY |
209 | static int gcm_hash_update(struct aead_request *req, |
210 | struct crypto_gcm_req_priv_ctx *pctx, | |
211 | crypto_completion_t complete, | |
212 | struct scatterlist *src, | |
213 | unsigned int len) | |
214 | { | |
215 | struct ahash_request *ahreq = &pctx->u.ahreq; | |
28db8e3e | 216 | |
9382d97a HY |
217 | ahash_request_set_callback(ahreq, aead_request_flags(req), |
218 | complete, req); | |
219 | ahash_request_set_crypt(ahreq, src, NULL, len); | |
220 | ||
221 | return crypto_ahash_update(ahreq); | |
28db8e3e MH |
222 | } |
223 | ||
9382d97a HY |
224 | static int gcm_hash_remain(struct aead_request *req, |
225 | struct crypto_gcm_req_priv_ctx *pctx, | |
226 | unsigned int remain, | |
227 | crypto_completion_t complete) | |
28db8e3e | 228 | { |
9382d97a HY |
229 | struct ahash_request *ahreq = &pctx->u.ahreq; |
230 | ||
231 | ahash_request_set_callback(ahreq, aead_request_flags(req), | |
232 | complete, req); | |
233 | sg_init_one(pctx->src, gcm_zeroes, remain); | |
234 | ahash_request_set_crypt(ahreq, pctx->src, NULL, remain); | |
235 | ||
236 | return crypto_ahash_update(ahreq); | |
237 | } | |
238 | ||
239 | static int gcm_hash_len(struct aead_request *req, | |
240 | struct crypto_gcm_req_priv_ctx *pctx) | |
241 | { | |
242 | struct ahash_request *ahreq = &pctx->u.ahreq; | |
243 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
244 | u128 lengths; | |
245 | ||
246 | lengths.a = cpu_to_be64(req->assoclen * 8); | |
247 | lengths.b = cpu_to_be64(gctx->cryptlen * 8); | |
248 | memcpy(pctx->iauth_tag, &lengths, 16); | |
249 | sg_init_one(pctx->src, pctx->iauth_tag, 16); | |
250 | ahash_request_set_callback(ahreq, aead_request_flags(req), | |
251 | gcm_hash_len_done, req); | |
252 | ahash_request_set_crypt(ahreq, pctx->src, | |
253 | NULL, sizeof(lengths)); | |
254 | ||
255 | return crypto_ahash_update(ahreq); | |
256 | } | |
257 | ||
258 | static int gcm_hash_final(struct aead_request *req, | |
259 | struct crypto_gcm_req_priv_ctx *pctx) | |
260 | { | |
261 | struct ahash_request *ahreq = &pctx->u.ahreq; | |
262 | ||
263 | ahash_request_set_callback(ahreq, aead_request_flags(req), | |
264 | gcm_hash_final_done, req); | |
265 | ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0); | |
266 | ||
267 | return crypto_ahash_final(ahreq); | |
268 | } | |
269 | ||
62c5593a | 270 | static void __gcm_hash_final_done(struct aead_request *req, int err) |
9382d97a | 271 | { |
2589469d | 272 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
273 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
274 | ||
275 | if (!err) | |
276 | crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16); | |
28db8e3e | 277 | |
62c5593a | 278 | gctx->complete(req, err); |
9382d97a HY |
279 | } |
280 | ||
62c5593a | 281 | static void gcm_hash_final_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
282 | { |
283 | struct aead_request *req = areq->data; | |
62c5593a HY |
284 | |
285 | __gcm_hash_final_done(req, err); | |
286 | } | |
287 | ||
288 | static void __gcm_hash_len_done(struct aead_request *req, int err) | |
289 | { | |
9382d97a HY |
290 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
291 | ||
292 | if (!err) { | |
293 | err = gcm_hash_final(req, pctx); | |
294 | if (err == -EINPROGRESS || err == -EBUSY) | |
295 | return; | |
296 | } | |
297 | ||
62c5593a | 298 | __gcm_hash_final_done(req, err); |
9382d97a HY |
299 | } |
300 | ||
62c5593a | 301 | static void gcm_hash_len_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
302 | { |
303 | struct aead_request *req = areq->data; | |
62c5593a HY |
304 | |
305 | __gcm_hash_len_done(req, err); | |
306 | } | |
307 | ||
308 | static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err) | |
309 | { | |
9382d97a HY |
310 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
311 | ||
312 | if (!err) { | |
313 | err = gcm_hash_len(req, pctx); | |
314 | if (err == -EINPROGRESS || err == -EBUSY) | |
315 | return; | |
316 | } | |
317 | ||
62c5593a | 318 | __gcm_hash_len_done(req, err); |
9382d97a HY |
319 | } |
320 | ||
62c5593a HY |
321 | static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq, |
322 | int err) | |
9382d97a HY |
323 | { |
324 | struct aead_request *req = areq->data; | |
62c5593a HY |
325 | |
326 | __gcm_hash_crypt_remain_done(req, err); | |
327 | } | |
328 | ||
329 | static void __gcm_hash_crypt_done(struct aead_request *req, int err) | |
330 | { | |
9382d97a HY |
331 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
332 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
333 | unsigned int remain; | |
334 | ||
335 | if (!err) { | |
336 | remain = gcm_remain(gctx->cryptlen); | |
337 | BUG_ON(!remain); | |
338 | err = gcm_hash_remain(req, pctx, remain, | |
339 | gcm_hash_crypt_remain_done); | |
340 | if (err == -EINPROGRESS || err == -EBUSY) | |
341 | return; | |
342 | } | |
343 | ||
62c5593a | 344 | __gcm_hash_crypt_remain_done(req, err); |
9382d97a HY |
345 | } |
346 | ||
62c5593a | 347 | static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
348 | { |
349 | struct aead_request *req = areq->data; | |
62c5593a HY |
350 | |
351 | __gcm_hash_crypt_done(req, err); | |
352 | } | |
353 | ||
354 | static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err) | |
355 | { | |
9382d97a HY |
356 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
357 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
358 | crypto_completion_t complete; | |
359 | unsigned int remain = 0; | |
360 | ||
361 | if (!err && gctx->cryptlen) { | |
362 | remain = gcm_remain(gctx->cryptlen); | |
363 | complete = remain ? gcm_hash_crypt_done : | |
364 | gcm_hash_crypt_remain_done; | |
365 | err = gcm_hash_update(req, pctx, complete, | |
366 | gctx->src, gctx->cryptlen); | |
367 | if (err == -EINPROGRESS || err == -EBUSY) | |
368 | return; | |
369 | } | |
370 | ||
371 | if (remain) | |
62c5593a | 372 | __gcm_hash_crypt_done(req, err); |
9382d97a | 373 | else |
62c5593a | 374 | __gcm_hash_crypt_remain_done(req, err); |
9382d97a HY |
375 | } |
376 | ||
62c5593a HY |
377 | static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq, |
378 | int err) | |
9382d97a HY |
379 | { |
380 | struct aead_request *req = areq->data; | |
62c5593a HY |
381 | |
382 | __gcm_hash_assoc_remain_done(req, err); | |
383 | } | |
384 | ||
385 | static void __gcm_hash_assoc_done(struct aead_request *req, int err) | |
386 | { | |
9382d97a HY |
387 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
388 | unsigned int remain; | |
389 | ||
390 | if (!err) { | |
391 | remain = gcm_remain(req->assoclen); | |
392 | BUG_ON(!remain); | |
393 | err = gcm_hash_remain(req, pctx, remain, | |
394 | gcm_hash_assoc_remain_done); | |
395 | if (err == -EINPROGRESS || err == -EBUSY) | |
396 | return; | |
397 | } | |
398 | ||
62c5593a | 399 | __gcm_hash_assoc_remain_done(req, err); |
9382d97a HY |
400 | } |
401 | ||
62c5593a | 402 | static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
403 | { |
404 | struct aead_request *req = areq->data; | |
62c5593a HY |
405 | |
406 | __gcm_hash_assoc_done(req, err); | |
407 | } | |
408 | ||
409 | static void __gcm_hash_init_done(struct aead_request *req, int err) | |
410 | { | |
9382d97a HY |
411 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
412 | crypto_completion_t complete; | |
413 | unsigned int remain = 0; | |
414 | ||
415 | if (!err && req->assoclen) { | |
416 | remain = gcm_remain(req->assoclen); | |
417 | complete = remain ? gcm_hash_assoc_done : | |
418 | gcm_hash_assoc_remain_done; | |
419 | err = gcm_hash_update(req, pctx, complete, | |
420 | req->assoc, req->assoclen); | |
421 | if (err == -EINPROGRESS || err == -EBUSY) | |
422 | return; | |
423 | } | |
424 | ||
425 | if (remain) | |
62c5593a | 426 | __gcm_hash_assoc_done(req, err); |
9382d97a | 427 | else |
62c5593a HY |
428 | __gcm_hash_assoc_remain_done(req, err); |
429 | } | |
430 | ||
431 | static void gcm_hash_init_done(struct crypto_async_request *areq, int err) | |
432 | { | |
433 | struct aead_request *req = areq->data; | |
434 | ||
435 | __gcm_hash_init_done(req, err); | |
9382d97a HY |
436 | } |
437 | ||
438 | static int gcm_hash(struct aead_request *req, | |
439 | struct crypto_gcm_req_priv_ctx *pctx) | |
440 | { | |
441 | struct ahash_request *ahreq = &pctx->u.ahreq; | |
442 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
443 | struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm); | |
444 | unsigned int remain; | |
445 | crypto_completion_t complete; | |
446 | int err; | |
447 | ||
448 | ahash_request_set_tfm(ahreq, ctx->ghash); | |
449 | ||
450 | ahash_request_set_callback(ahreq, aead_request_flags(req), | |
451 | gcm_hash_init_done, req); | |
452 | err = crypto_ahash_init(ahreq); | |
453 | if (err) | |
454 | return err; | |
455 | remain = gcm_remain(req->assoclen); | |
456 | complete = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done; | |
457 | err = gcm_hash_update(req, pctx, complete, req->assoc, req->assoclen); | |
458 | if (err) | |
459 | return err; | |
460 | if (remain) { | |
461 | err = gcm_hash_remain(req, pctx, remain, | |
462 | gcm_hash_assoc_remain_done); | |
463 | if (err) | |
464 | return err; | |
465 | } | |
466 | remain = gcm_remain(gctx->cryptlen); | |
467 | complete = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done; | |
468 | err = gcm_hash_update(req, pctx, complete, gctx->src, gctx->cryptlen); | |
469 | if (err) | |
470 | return err; | |
471 | if (remain) { | |
472 | err = gcm_hash_remain(req, pctx, remain, | |
473 | gcm_hash_crypt_remain_done); | |
474 | if (err) | |
475 | return err; | |
476 | } | |
477 | err = gcm_hash_len(req, pctx); | |
478 | if (err) | |
479 | return err; | |
480 | err = gcm_hash_final(req, pctx); | |
481 | if (err) | |
482 | return err; | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
487 | static void gcm_enc_copy_hash(struct aead_request *req, | |
488 | struct crypto_gcm_req_priv_ctx *pctx) | |
489 | { | |
490 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
491 | u8 *auth_tag = pctx->auth_tag; | |
28db8e3e | 492 | |
6160b289 HX |
493 | scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen, |
494 | crypto_aead_authsize(aead), 1); | |
6160b289 HX |
495 | } |
496 | ||
62c5593a | 497 | static void gcm_enc_hash_done(struct aead_request *req, int err) |
6160b289 | 498 | { |
9382d97a | 499 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
6160b289 HX |
500 | |
501 | if (!err) | |
9382d97a | 502 | gcm_enc_copy_hash(req, pctx); |
6160b289 | 503 | |
28db8e3e MH |
504 | aead_request_complete(req, err); |
505 | } | |
506 | ||
62c5593a | 507 | static void gcm_encrypt_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
508 | { |
509 | struct aead_request *req = areq->data; | |
510 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); | |
511 | ||
512 | if (!err) { | |
513 | err = gcm_hash(req, pctx); | |
514 | if (err == -EINPROGRESS || err == -EBUSY) | |
515 | return; | |
62c5593a HY |
516 | else if (!err) { |
517 | crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16); | |
518 | gcm_enc_copy_hash(req, pctx); | |
519 | } | |
9382d97a HY |
520 | } |
521 | ||
62c5593a | 522 | aead_request_complete(req, err); |
9382d97a HY |
523 | } |
524 | ||
28db8e3e MH |
525 | static int crypto_gcm_encrypt(struct aead_request *req) |
526 | { | |
2589469d | 527 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
528 | struct ablkcipher_request *abreq = &pctx->u.abreq; |
529 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
84c91152 HX |
530 | int err; |
531 | ||
532 | crypto_gcm_init_crypt(abreq, req, req->cryptlen); | |
533 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
9382d97a HY |
534 | gcm_encrypt_done, req); |
535 | ||
536 | gctx->src = req->dst; | |
537 | gctx->cryptlen = req->cryptlen; | |
538 | gctx->complete = gcm_enc_hash_done; | |
28db8e3e | 539 | |
84c91152 | 540 | err = crypto_ablkcipher_encrypt(abreq); |
28db8e3e MH |
541 | if (err) |
542 | return err; | |
543 | ||
9382d97a HY |
544 | err = gcm_hash(req, pctx); |
545 | if (err) | |
546 | return err; | |
547 | ||
548 | crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16); | |
549 | gcm_enc_copy_hash(req, pctx); | |
550 | ||
551 | return 0; | |
28db8e3e MH |
552 | } |
553 | ||
9382d97a HY |
554 | static int crypto_gcm_verify(struct aead_request *req, |
555 | struct crypto_gcm_req_priv_ctx *pctx) | |
84c91152 HX |
556 | { |
557 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
84c91152 HX |
558 | u8 *auth_tag = pctx->auth_tag; |
559 | u8 *iauth_tag = pctx->iauth_tag; | |
560 | unsigned int authsize = crypto_aead_authsize(aead); | |
561 | unsigned int cryptlen = req->cryptlen - authsize; | |
562 | ||
9382d97a | 563 | crypto_xor(auth_tag, iauth_tag, 16); |
84c91152 HX |
564 | scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0); |
565 | return memcmp(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0; | |
566 | } | |
567 | ||
9382d97a | 568 | static void gcm_decrypt_done(struct crypto_async_request *areq, int err) |
28db8e3e | 569 | { |
84c91152 | 570 | struct aead_request *req = areq->data; |
9382d97a | 571 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
84c91152 HX |
572 | |
573 | if (!err) | |
9382d97a | 574 | err = crypto_gcm_verify(req, pctx); |
84c91152 HX |
575 | |
576 | aead_request_complete(req, err); | |
28db8e3e MH |
577 | } |
578 | ||
62c5593a | 579 | static void gcm_dec_hash_done(struct aead_request *req, int err) |
9382d97a | 580 | { |
9382d97a HY |
581 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
582 | struct ablkcipher_request *abreq = &pctx->u.abreq; | |
583 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
584 | ||
585 | if (!err) { | |
586 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
587 | gcm_decrypt_done, req); | |
588 | crypto_gcm_init_crypt(abreq, req, gctx->cryptlen); | |
589 | err = crypto_ablkcipher_decrypt(abreq); | |
590 | if (err == -EINPROGRESS || err == -EBUSY) | |
591 | return; | |
62c5593a HY |
592 | else if (!err) |
593 | err = crypto_gcm_verify(req, pctx); | |
9382d97a HY |
594 | } |
595 | ||
62c5593a | 596 | aead_request_complete(req, err); |
9382d97a HY |
597 | } |
598 | ||
28db8e3e MH |
599 | static int crypto_gcm_decrypt(struct aead_request *req) |
600 | { | |
6160b289 | 601 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
2589469d | 602 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
603 | struct ablkcipher_request *abreq = &pctx->u.abreq; |
604 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
6160b289 | 605 | unsigned int authsize = crypto_aead_authsize(aead); |
9382d97a | 606 | unsigned int cryptlen = req->cryptlen; |
28db8e3e MH |
607 | int err; |
608 | ||
6160b289 | 609 | if (cryptlen < authsize) |
28db8e3e | 610 | return -EINVAL; |
6160b289 | 611 | cryptlen -= authsize; |
28db8e3e | 612 | |
9382d97a HY |
613 | gctx->src = req->src; |
614 | gctx->cryptlen = cryptlen; | |
615 | gctx->complete = gcm_dec_hash_done; | |
28db8e3e | 616 | |
9382d97a HY |
617 | err = gcm_hash(req, pctx); |
618 | if (err) | |
619 | return err; | |
28db8e3e | 620 | |
9382d97a HY |
621 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
622 | gcm_decrypt_done, req); | |
623 | crypto_gcm_init_crypt(abreq, req, cryptlen); | |
84c91152 HX |
624 | err = crypto_ablkcipher_decrypt(abreq); |
625 | if (err) | |
626 | return err; | |
28db8e3e | 627 | |
9382d97a | 628 | return crypto_gcm_verify(req, pctx); |
28db8e3e MH |
629 | } |
630 | ||
631 | static int crypto_gcm_init_tfm(struct crypto_tfm *tfm) | |
632 | { | |
633 | struct crypto_instance *inst = (void *)tfm->__crt_alg; | |
634 | struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst); | |
635 | struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm); | |
636 | struct crypto_ablkcipher *ctr; | |
9382d97a | 637 | struct crypto_ahash *ghash; |
28db8e3e MH |
638 | unsigned long align; |
639 | int err; | |
640 | ||
9382d97a HY |
641 | ghash = crypto_spawn_ahash(&ictx->ghash); |
642 | if (IS_ERR(ghash)) | |
643 | return PTR_ERR(ghash); | |
644 | ||
1472e5eb | 645 | ctr = crypto_spawn_skcipher(&ictx->ctr); |
28db8e3e MH |
646 | err = PTR_ERR(ctr); |
647 | if (IS_ERR(ctr)) | |
9382d97a | 648 | goto err_free_hash; |
28db8e3e MH |
649 | |
650 | ctx->ctr = ctr; | |
9382d97a | 651 | ctx->ghash = ghash; |
28db8e3e | 652 | |
2589469d | 653 | align = crypto_tfm_alg_alignmask(tfm); |
28db8e3e | 654 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
7f681378 | 655 | tfm->crt_aead.reqsize = align + |
9382d97a HY |
656 | offsetof(struct crypto_gcm_req_priv_ctx, u) + |
657 | max(sizeof(struct ablkcipher_request) + | |
658 | crypto_ablkcipher_reqsize(ctr), | |
659 | sizeof(struct ahash_request) + | |
660 | crypto_ahash_reqsize(ghash)); | |
28db8e3e MH |
661 | |
662 | return 0; | |
9382d97a HY |
663 | |
664 | err_free_hash: | |
665 | crypto_free_ahash(ghash); | |
666 | return err; | |
28db8e3e MH |
667 | } |
668 | ||
669 | static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm) | |
670 | { | |
671 | struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm); | |
672 | ||
9382d97a | 673 | crypto_free_ahash(ctx->ghash); |
28db8e3e MH |
674 | crypto_free_ablkcipher(ctx->ctr); |
675 | } | |
676 | ||
d00aa19b HX |
677 | static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb, |
678 | const char *full_name, | |
9382d97a HY |
679 | const char *ctr_name, |
680 | const char *ghash_name) | |
28db8e3e | 681 | { |
d00aa19b | 682 | struct crypto_attr_type *algt; |
28db8e3e MH |
683 | struct crypto_instance *inst; |
684 | struct crypto_alg *ctr; | |
9382d97a HY |
685 | struct crypto_alg *ghash_alg; |
686 | struct ahash_alg *ghash_ahash_alg; | |
28db8e3e MH |
687 | struct gcm_instance_ctx *ctx; |
688 | int err; | |
28db8e3e | 689 | |
d00aa19b HX |
690 | algt = crypto_get_attr_type(tb); |
691 | err = PTR_ERR(algt); | |
692 | if (IS_ERR(algt)) | |
28db8e3e MH |
693 | return ERR_PTR(err); |
694 | ||
d00aa19b HX |
695 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
696 | return ERR_PTR(-EINVAL); | |
28db8e3e | 697 | |
9382d97a HY |
698 | ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type, |
699 | CRYPTO_ALG_TYPE_HASH, | |
700 | CRYPTO_ALG_TYPE_AHASH_MASK); | |
701 | err = PTR_ERR(ghash_alg); | |
702 | if (IS_ERR(ghash_alg)) | |
703 | return ERR_PTR(err); | |
704 | ||
705 | err = -ENOMEM; | |
1472e5eb HX |
706 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
707 | if (!inst) | |
9382d97a | 708 | goto out_put_ghash; |
28db8e3e | 709 | |
1472e5eb | 710 | ctx = crypto_instance_ctx(inst); |
9382d97a HY |
711 | ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base); |
712 | err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg, | |
713 | inst); | |
714 | if (err) | |
715 | goto err_free_inst; | |
716 | ||
1472e5eb HX |
717 | crypto_set_skcipher_spawn(&ctx->ctr, inst); |
718 | err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0, | |
719 | crypto_requires_sync(algt->type, | |
720 | algt->mask)); | |
721 | if (err) | |
9382d97a | 722 | goto err_drop_ghash; |
1472e5eb HX |
723 | |
724 | ctr = crypto_skcipher_spawn_alg(&ctx->ctr); | |
28db8e3e | 725 | |
d00aa19b | 726 | /* We only support 16-byte blocks. */ |
1472e5eb | 727 | if (ctr->cra_ablkcipher.ivsize != 16) |
d00aa19b HX |
728 | goto out_put_ctr; |
729 | ||
730 | /* Not a stream cipher? */ | |
731 | err = -EINVAL; | |
732 | if (ctr->cra_blocksize != 1) | |
28db8e3e MH |
733 | goto out_put_ctr; |
734 | ||
28db8e3e | 735 | err = -ENAMETOOLONG; |
d00aa19b | 736 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
9382d97a HY |
737 | "gcm_base(%s,%s)", ctr->cra_driver_name, |
738 | ghash_alg->cra_driver_name) >= | |
d00aa19b | 739 | CRYPTO_MAX_ALG_NAME) |
1472e5eb | 740 | goto out_put_ctr; |
28db8e3e | 741 | |
d00aa19b HX |
742 | memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME); |
743 | ||
1472e5eb HX |
744 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; |
745 | inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC; | |
28db8e3e | 746 | inst->alg.cra_priority = ctr->cra_priority; |
d00aa19b | 747 | inst->alg.cra_blocksize = 1; |
2589469d | 748 | inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1); |
28db8e3e | 749 | inst->alg.cra_type = &crypto_aead_type; |
84c91152 | 750 | inst->alg.cra_aead.ivsize = 16; |
7ba683a6 | 751 | inst->alg.cra_aead.maxauthsize = 16; |
28db8e3e MH |
752 | inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx); |
753 | inst->alg.cra_init = crypto_gcm_init_tfm; | |
754 | inst->alg.cra_exit = crypto_gcm_exit_tfm; | |
755 | inst->alg.cra_aead.setkey = crypto_gcm_setkey; | |
dadbc53d | 756 | inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize; |
28db8e3e MH |
757 | inst->alg.cra_aead.encrypt = crypto_gcm_encrypt; |
758 | inst->alg.cra_aead.decrypt = crypto_gcm_decrypt; | |
759 | ||
760 | out: | |
9382d97a | 761 | crypto_mod_put(ghash_alg); |
28db8e3e | 762 | return inst; |
1472e5eb HX |
763 | |
764 | out_put_ctr: | |
765 | crypto_drop_skcipher(&ctx->ctr); | |
9382d97a HY |
766 | err_drop_ghash: |
767 | crypto_drop_ahash(&ctx->ghash); | |
28db8e3e MH |
768 | err_free_inst: |
769 | kfree(inst); | |
9382d97a | 770 | out_put_ghash: |
28db8e3e MH |
771 | inst = ERR_PTR(err); |
772 | goto out; | |
773 | } | |
774 | ||
d00aa19b HX |
775 | static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb) |
776 | { | |
777 | int err; | |
778 | const char *cipher_name; | |
779 | char ctr_name[CRYPTO_MAX_ALG_NAME]; | |
780 | char full_name[CRYPTO_MAX_ALG_NAME]; | |
781 | ||
782 | cipher_name = crypto_attr_alg_name(tb[1]); | |
783 | err = PTR_ERR(cipher_name); | |
784 | if (IS_ERR(cipher_name)) | |
785 | return ERR_PTR(err); | |
786 | ||
787 | if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >= | |
788 | CRYPTO_MAX_ALG_NAME) | |
789 | return ERR_PTR(-ENAMETOOLONG); | |
790 | ||
791 | if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >= | |
792 | CRYPTO_MAX_ALG_NAME) | |
793 | return ERR_PTR(-ENAMETOOLONG); | |
794 | ||
9382d97a | 795 | return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash"); |
d00aa19b HX |
796 | } |
797 | ||
28db8e3e MH |
798 | static void crypto_gcm_free(struct crypto_instance *inst) |
799 | { | |
800 | struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst); | |
801 | ||
1472e5eb | 802 | crypto_drop_skcipher(&ctx->ctr); |
9382d97a | 803 | crypto_drop_ahash(&ctx->ghash); |
28db8e3e MH |
804 | kfree(inst); |
805 | } | |
806 | ||
807 | static struct crypto_template crypto_gcm_tmpl = { | |
808 | .name = "gcm", | |
809 | .alloc = crypto_gcm_alloc, | |
810 | .free = crypto_gcm_free, | |
811 | .module = THIS_MODULE, | |
812 | }; | |
813 | ||
d00aa19b HX |
814 | static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb) |
815 | { | |
816 | int err; | |
817 | const char *ctr_name; | |
9382d97a | 818 | const char *ghash_name; |
d00aa19b HX |
819 | char full_name[CRYPTO_MAX_ALG_NAME]; |
820 | ||
821 | ctr_name = crypto_attr_alg_name(tb[1]); | |
822 | err = PTR_ERR(ctr_name); | |
823 | if (IS_ERR(ctr_name)) | |
824 | return ERR_PTR(err); | |
825 | ||
9382d97a HY |
826 | ghash_name = crypto_attr_alg_name(tb[2]); |
827 | err = PTR_ERR(ghash_name); | |
828 | if (IS_ERR(ghash_name)) | |
829 | return ERR_PTR(err); | |
830 | ||
831 | if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)", | |
832 | ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME) | |
d00aa19b HX |
833 | return ERR_PTR(-ENAMETOOLONG); |
834 | ||
9382d97a | 835 | return crypto_gcm_alloc_common(tb, full_name, ctr_name, ghash_name); |
d00aa19b HX |
836 | } |
837 | ||
838 | static struct crypto_template crypto_gcm_base_tmpl = { | |
839 | .name = "gcm_base", | |
840 | .alloc = crypto_gcm_base_alloc, | |
841 | .free = crypto_gcm_free, | |
842 | .module = THIS_MODULE, | |
843 | }; | |
844 | ||
dadbc53d HX |
845 | static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key, |
846 | unsigned int keylen) | |
847 | { | |
848 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); | |
849 | struct crypto_aead *child = ctx->child; | |
850 | int err; | |
851 | ||
852 | if (keylen < 4) | |
853 | return -EINVAL; | |
854 | ||
855 | keylen -= 4; | |
856 | memcpy(ctx->nonce, key + keylen, 4); | |
857 | ||
858 | crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
859 | crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & | |
860 | CRYPTO_TFM_REQ_MASK); | |
861 | err = crypto_aead_setkey(child, key, keylen); | |
862 | crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & | |
863 | CRYPTO_TFM_RES_MASK); | |
864 | ||
865 | return err; | |
866 | } | |
867 | ||
868 | static int crypto_rfc4106_setauthsize(struct crypto_aead *parent, | |
869 | unsigned int authsize) | |
870 | { | |
871 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); | |
872 | ||
873 | switch (authsize) { | |
874 | case 8: | |
875 | case 12: | |
876 | case 16: | |
877 | break; | |
878 | default: | |
879 | return -EINVAL; | |
880 | } | |
881 | ||
882 | return crypto_aead_setauthsize(ctx->child, authsize); | |
883 | } | |
884 | ||
885 | static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req) | |
886 | { | |
887 | struct aead_request *subreq = aead_request_ctx(req); | |
888 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
889 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead); | |
890 | struct crypto_aead *child = ctx->child; | |
891 | u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child), | |
892 | crypto_aead_alignmask(child) + 1); | |
893 | ||
894 | memcpy(iv, ctx->nonce, 4); | |
895 | memcpy(iv + 4, req->iv, 8); | |
896 | ||
897 | aead_request_set_tfm(subreq, child); | |
898 | aead_request_set_callback(subreq, req->base.flags, req->base.complete, | |
899 | req->base.data); | |
900 | aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv); | |
901 | aead_request_set_assoc(subreq, req->assoc, req->assoclen); | |
902 | ||
903 | return subreq; | |
904 | } | |
905 | ||
906 | static int crypto_rfc4106_encrypt(struct aead_request *req) | |
907 | { | |
908 | req = crypto_rfc4106_crypt(req); | |
909 | ||
910 | return crypto_aead_encrypt(req); | |
911 | } | |
912 | ||
913 | static int crypto_rfc4106_decrypt(struct aead_request *req) | |
914 | { | |
915 | req = crypto_rfc4106_crypt(req); | |
916 | ||
917 | return crypto_aead_decrypt(req); | |
918 | } | |
919 | ||
920 | static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm) | |
921 | { | |
922 | struct crypto_instance *inst = (void *)tfm->__crt_alg; | |
923 | struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst); | |
924 | struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm); | |
925 | struct crypto_aead *aead; | |
926 | unsigned long align; | |
927 | ||
928 | aead = crypto_spawn_aead(spawn); | |
929 | if (IS_ERR(aead)) | |
930 | return PTR_ERR(aead); | |
931 | ||
932 | ctx->child = aead; | |
933 | ||
934 | align = crypto_aead_alignmask(aead); | |
935 | align &= ~(crypto_tfm_ctx_alignment() - 1); | |
936 | tfm->crt_aead.reqsize = sizeof(struct aead_request) + | |
937 | ALIGN(crypto_aead_reqsize(aead), | |
938 | crypto_tfm_ctx_alignment()) + | |
939 | align + 16; | |
940 | ||
941 | return 0; | |
942 | } | |
943 | ||
944 | static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm) | |
945 | { | |
946 | struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm); | |
947 | ||
948 | crypto_free_aead(ctx->child); | |
949 | } | |
950 | ||
951 | static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb) | |
952 | { | |
953 | struct crypto_attr_type *algt; | |
954 | struct crypto_instance *inst; | |
955 | struct crypto_aead_spawn *spawn; | |
956 | struct crypto_alg *alg; | |
957 | const char *ccm_name; | |
958 | int err; | |
959 | ||
960 | algt = crypto_get_attr_type(tb); | |
961 | err = PTR_ERR(algt); | |
962 | if (IS_ERR(algt)) | |
963 | return ERR_PTR(err); | |
964 | ||
965 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) | |
966 | return ERR_PTR(-EINVAL); | |
967 | ||
968 | ccm_name = crypto_attr_alg_name(tb[1]); | |
969 | err = PTR_ERR(ccm_name); | |
970 | if (IS_ERR(ccm_name)) | |
971 | return ERR_PTR(err); | |
972 | ||
973 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
974 | if (!inst) | |
975 | return ERR_PTR(-ENOMEM); | |
976 | ||
977 | spawn = crypto_instance_ctx(inst); | |
978 | crypto_set_aead_spawn(spawn, inst); | |
979 | err = crypto_grab_aead(spawn, ccm_name, 0, | |
980 | crypto_requires_sync(algt->type, algt->mask)); | |
981 | if (err) | |
982 | goto out_free_inst; | |
983 | ||
984 | alg = crypto_aead_spawn_alg(spawn); | |
985 | ||
986 | err = -EINVAL; | |
987 | ||
988 | /* We only support 16-byte blocks. */ | |
989 | if (alg->cra_aead.ivsize != 16) | |
990 | goto out_drop_alg; | |
991 | ||
992 | /* Not a stream cipher? */ | |
993 | if (alg->cra_blocksize != 1) | |
994 | goto out_drop_alg; | |
995 | ||
996 | err = -ENAMETOOLONG; | |
997 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, | |
998 | "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME || | |
999 | snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
1000 | "rfc4106(%s)", alg->cra_driver_name) >= | |
1001 | CRYPTO_MAX_ALG_NAME) | |
1002 | goto out_drop_alg; | |
1003 | ||
1004 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; | |
1005 | inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC; | |
1006 | inst->alg.cra_priority = alg->cra_priority; | |
1007 | inst->alg.cra_blocksize = 1; | |
1008 | inst->alg.cra_alignmask = alg->cra_alignmask; | |
1009 | inst->alg.cra_type = &crypto_nivaead_type; | |
1010 | ||
1011 | inst->alg.cra_aead.ivsize = 8; | |
1012 | inst->alg.cra_aead.maxauthsize = 16; | |
1013 | ||
1014 | inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx); | |
1015 | ||
1016 | inst->alg.cra_init = crypto_rfc4106_init_tfm; | |
1017 | inst->alg.cra_exit = crypto_rfc4106_exit_tfm; | |
1018 | ||
1019 | inst->alg.cra_aead.setkey = crypto_rfc4106_setkey; | |
1020 | inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize; | |
1021 | inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt; | |
1022 | inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt; | |
1023 | ||
1024 | inst->alg.cra_aead.geniv = "seqiv"; | |
1025 | ||
1026 | out: | |
1027 | return inst; | |
1028 | ||
1029 | out_drop_alg: | |
1030 | crypto_drop_aead(spawn); | |
1031 | out_free_inst: | |
1032 | kfree(inst); | |
1033 | inst = ERR_PTR(err); | |
1034 | goto out; | |
1035 | } | |
1036 | ||
1037 | static void crypto_rfc4106_free(struct crypto_instance *inst) | |
1038 | { | |
1039 | crypto_drop_spawn(crypto_instance_ctx(inst)); | |
1040 | kfree(inst); | |
1041 | } | |
1042 | ||
1043 | static struct crypto_template crypto_rfc4106_tmpl = { | |
1044 | .name = "rfc4106", | |
1045 | .alloc = crypto_rfc4106_alloc, | |
1046 | .free = crypto_rfc4106_free, | |
1047 | .module = THIS_MODULE, | |
1048 | }; | |
1049 | ||
28db8e3e MH |
1050 | static int __init crypto_gcm_module_init(void) |
1051 | { | |
d00aa19b HX |
1052 | int err; |
1053 | ||
9382d97a HY |
1054 | gcm_zeroes = kzalloc(16, GFP_KERNEL); |
1055 | if (!gcm_zeroes) | |
1056 | return -ENOMEM; | |
1057 | ||
d00aa19b HX |
1058 | err = crypto_register_template(&crypto_gcm_base_tmpl); |
1059 | if (err) | |
1060 | goto out; | |
1061 | ||
1062 | err = crypto_register_template(&crypto_gcm_tmpl); | |
1063 | if (err) | |
1064 | goto out_undo_base; | |
1065 | ||
dadbc53d HX |
1066 | err = crypto_register_template(&crypto_rfc4106_tmpl); |
1067 | if (err) | |
1068 | goto out_undo_gcm; | |
1069 | ||
9382d97a | 1070 | return 0; |
d00aa19b | 1071 | |
dadbc53d HX |
1072 | out_undo_gcm: |
1073 | crypto_unregister_template(&crypto_gcm_tmpl); | |
d00aa19b HX |
1074 | out_undo_base: |
1075 | crypto_unregister_template(&crypto_gcm_base_tmpl); | |
9382d97a HY |
1076 | out: |
1077 | kfree(gcm_zeroes); | |
1078 | return err; | |
28db8e3e MH |
1079 | } |
1080 | ||
1081 | static void __exit crypto_gcm_module_exit(void) | |
1082 | { | |
9382d97a | 1083 | kfree(gcm_zeroes); |
dadbc53d | 1084 | crypto_unregister_template(&crypto_rfc4106_tmpl); |
28db8e3e | 1085 | crypto_unregister_template(&crypto_gcm_tmpl); |
d00aa19b | 1086 | crypto_unregister_template(&crypto_gcm_base_tmpl); |
28db8e3e MH |
1087 | } |
1088 | ||
1089 | module_init(crypto_gcm_module_init); | |
1090 | module_exit(crypto_gcm_module_exit); | |
1091 | ||
1092 | MODULE_LICENSE("GPL"); | |
1093 | MODULE_DESCRIPTION("Galois/Counter Mode"); | |
1094 | MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>"); | |
d00aa19b | 1095 | MODULE_ALIAS("gcm_base"); |
dadbc53d | 1096 | MODULE_ALIAS("rfc4106"); |