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> |
17db8546 | 15 | #include <crypto/null.h> |
42c271c6 | 16 | #include <crypto/scatterwalk.h> |
e0ab7e9c | 17 | #include <crypto/gcm.h> |
9382d97a HY |
18 | #include <crypto/hash.h> |
19 | #include "internal.h" | |
28db8e3e MH |
20 | #include <linux/err.h> |
21 | #include <linux/init.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/slab.h> | |
25 | ||
28db8e3e | 26 | struct gcm_instance_ctx { |
1472e5eb | 27 | struct crypto_skcipher_spawn ctr; |
9382d97a | 28 | struct crypto_ahash_spawn ghash; |
28db8e3e MH |
29 | }; |
30 | ||
31 | struct crypto_gcm_ctx { | |
16f37ecd | 32 | struct crypto_skcipher *ctr; |
9382d97a | 33 | struct crypto_ahash *ghash; |
28db8e3e MH |
34 | }; |
35 | ||
dadbc53d HX |
36 | struct crypto_rfc4106_ctx { |
37 | struct crypto_aead *child; | |
38 | u8 nonce[4]; | |
39 | }; | |
40 | ||
7b05a373 HX |
41 | struct crypto_rfc4106_req_ctx { |
42 | struct scatterlist src[3]; | |
43 | struct scatterlist dst[3]; | |
44 | struct aead_request subreq; | |
45 | }; | |
46 | ||
9489667d JK |
47 | struct crypto_rfc4543_instance_ctx { |
48 | struct crypto_aead_spawn aead; | |
9489667d JK |
49 | }; |
50 | ||
73c89c15 TB |
51 | struct crypto_rfc4543_ctx { |
52 | struct crypto_aead *child; | |
8d605398 | 53 | struct crypto_sync_skcipher *null; |
73c89c15 TB |
54 | u8 nonce[4]; |
55 | }; | |
56 | ||
57 | struct crypto_rfc4543_req_ctx { | |
73c89c15 TB |
58 | struct aead_request subreq; |
59 | }; | |
60 | ||
28db8e3e | 61 | struct crypto_gcm_ghash_ctx { |
9382d97a HY |
62 | unsigned int cryptlen; |
63 | struct scatterlist *src; | |
adcbc688 | 64 | int (*complete)(struct aead_request *req, u32 flags); |
28db8e3e MH |
65 | }; |
66 | ||
67 | struct crypto_gcm_req_priv_ctx { | |
adcbc688 | 68 | u8 iv[16]; |
28db8e3e | 69 | u8 auth_tag[16]; |
6160b289 | 70 | u8 iauth_tag[16]; |
adcbc688 HX |
71 | struct scatterlist src[3]; |
72 | struct scatterlist dst[3]; | |
73 | struct scatterlist sg; | |
9382d97a HY |
74 | struct crypto_gcm_ghash_ctx ghash_ctx; |
75 | union { | |
76 | struct ahash_request ahreq; | |
16f37ecd | 77 | struct skcipher_request skreq; |
9382d97a | 78 | } u; |
28db8e3e MH |
79 | }; |
80 | ||
adcbc688 HX |
81 | static struct { |
82 | u8 buf[16]; | |
83 | struct scatterlist sg; | |
84 | } *gcm_zeroes; | |
85 | ||
86 | static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc); | |
9382d97a | 87 | |
2589469d HX |
88 | static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx( |
89 | struct aead_request *req) | |
90 | { | |
91 | unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); | |
92 | ||
93 | return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); | |
94 | } | |
95 | ||
28db8e3e MH |
96 | static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key, |
97 | unsigned int keylen) | |
98 | { | |
99 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); | |
9382d97a | 100 | struct crypto_ahash *ghash = ctx->ghash; |
16f37ecd | 101 | struct crypto_skcipher *ctr = ctx->ctr; |
84c91152 HX |
102 | struct { |
103 | be128 hash; | |
50d2e6dc | 104 | u8 iv[16]; |
84c91152 | 105 | |
76c67394 | 106 | struct crypto_wait wait; |
84c91152 HX |
107 | |
108 | struct scatterlist sg[1]; | |
16f37ecd | 109 | struct skcipher_request req; |
84c91152 HX |
110 | } *data; |
111 | int err; | |
28db8e3e | 112 | |
16f37ecd HX |
113 | crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK); |
114 | crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) & | |
115 | CRYPTO_TFM_REQ_MASK); | |
116 | err = crypto_skcipher_setkey(ctr, key, keylen); | |
117 | crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) & | |
adcbc688 | 118 | CRYPTO_TFM_RES_MASK); |
28db8e3e | 119 | if (err) |
84c91152 | 120 | return err; |
28db8e3e | 121 | |
16f37ecd | 122 | data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr), |
84c91152 HX |
123 | GFP_KERNEL); |
124 | if (!data) | |
125 | return -ENOMEM; | |
126 | ||
76c67394 | 127 | crypto_init_wait(&data->wait); |
84c91152 | 128 | sg_init_one(data->sg, &data->hash, sizeof(data->hash)); |
16f37ecd HX |
129 | skcipher_request_set_tfm(&data->req, ctr); |
130 | skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP | | |
131 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
76c67394 GBY |
132 | crypto_req_done, |
133 | &data->wait); | |
16f37ecd HX |
134 | skcipher_request_set_crypt(&data->req, data->sg, data->sg, |
135 | sizeof(data->hash), data->iv); | |
136 | ||
76c67394 GBY |
137 | err = crypto_wait_req(crypto_skcipher_encrypt(&data->req), |
138 | &data->wait); | |
84c91152 | 139 | |
28db8e3e MH |
140 | if (err) |
141 | goto out; | |
142 | ||
9382d97a HY |
143 | crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK); |
144 | crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) & | |
145 | CRYPTO_TFM_REQ_MASK); | |
146 | err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128)); | |
147 | crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) & | |
148 | CRYPTO_TFM_RES_MASK); | |
28db8e3e | 149 | |
84c91152 | 150 | out: |
adcbc688 | 151 | kzfree(data); |
28db8e3e MH |
152 | return err; |
153 | } | |
154 | ||
dadbc53d HX |
155 | static int crypto_gcm_setauthsize(struct crypto_aead *tfm, |
156 | unsigned int authsize) | |
157 | { | |
158 | switch (authsize) { | |
159 | case 4: | |
160 | case 8: | |
161 | case 12: | |
162 | case 13: | |
163 | case 14: | |
164 | case 15: | |
165 | case 16: | |
166 | break; | |
167 | default: | |
168 | return -EINVAL; | |
169 | } | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
adcbc688 | 174 | static void crypto_gcm_init_common(struct aead_request *req) |
28db8e3e | 175 | { |
2589469d | 176 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
84c91152 | 177 | __be32 counter = cpu_to_be32(1); |
adcbc688 | 178 | struct scatterlist *sg; |
84c91152 HX |
179 | |
180 | memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag)); | |
e0ab7e9c CL |
181 | memcpy(pctx->iv, req->iv, GCM_AES_IV_SIZE); |
182 | memcpy(pctx->iv + GCM_AES_IV_SIZE, &counter, 4); | |
84c91152 | 183 | |
adcbc688 | 184 | sg_init_table(pctx->src, 3); |
84c91152 | 185 | sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag)); |
adcbc688 HX |
186 | sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen); |
187 | if (sg != pctx->src + 1) | |
c56f6d12 | 188 | sg_chain(pctx->src, 2, sg); |
84c91152 | 189 | |
84c91152 | 190 | if (req->src != req->dst) { |
adcbc688 | 191 | sg_init_table(pctx->dst, 3); |
84c91152 | 192 | sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag)); |
adcbc688 HX |
193 | sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen); |
194 | if (sg != pctx->dst + 1) | |
c56f6d12 | 195 | sg_chain(pctx->dst, 2, sg); |
84c91152 | 196 | } |
adcbc688 HX |
197 | } |
198 | ||
199 | static void crypto_gcm_init_crypt(struct aead_request *req, | |
200 | unsigned int cryptlen) | |
201 | { | |
202 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
203 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); | |
204 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); | |
16f37ecd | 205 | struct skcipher_request *skreq = &pctx->u.skreq; |
adcbc688 HX |
206 | struct scatterlist *dst; |
207 | ||
208 | dst = req->src == req->dst ? pctx->src : pctx->dst; | |
28db8e3e | 209 | |
16f37ecd HX |
210 | skcipher_request_set_tfm(skreq, ctx->ctr); |
211 | skcipher_request_set_crypt(skreq, pctx->src, dst, | |
84c91152 | 212 | cryptlen + sizeof(pctx->auth_tag), |
adcbc688 | 213 | pctx->iv); |
9382d97a HY |
214 | } |
215 | ||
216 | static inline unsigned int gcm_remain(unsigned int len) | |
217 | { | |
218 | len &= 0xfU; | |
219 | return len ? 16 - len : 0; | |
220 | } | |
221 | ||
222 | static void gcm_hash_len_done(struct crypto_async_request *areq, int err); | |
28db8e3e | 223 | |
9382d97a | 224 | static int gcm_hash_update(struct aead_request *req, |
3e3dc25f | 225 | crypto_completion_t compl, |
9382d97a | 226 | struct scatterlist *src, |
adcbc688 | 227 | unsigned int len, u32 flags) |
9382d97a | 228 | { |
adcbc688 | 229 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a | 230 | struct ahash_request *ahreq = &pctx->u.ahreq; |
28db8e3e | 231 | |
adcbc688 | 232 | ahash_request_set_callback(ahreq, flags, compl, req); |
9382d97a HY |
233 | ahash_request_set_crypt(ahreq, src, NULL, len); |
234 | ||
235 | return crypto_ahash_update(ahreq); | |
28db8e3e MH |
236 | } |
237 | ||
9382d97a | 238 | static int gcm_hash_remain(struct aead_request *req, |
9382d97a | 239 | unsigned int remain, |
adcbc688 | 240 | crypto_completion_t compl, u32 flags) |
28db8e3e | 241 | { |
adcbc688 | 242 | return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags); |
9382d97a HY |
243 | } |
244 | ||
adcbc688 | 245 | static int gcm_hash_len(struct aead_request *req, u32 flags) |
9382d97a | 246 | { |
adcbc688 | 247 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
248 | struct ahash_request *ahreq = &pctx->u.ahreq; |
249 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
18666550 | 250 | be128 lengths; |
9382d97a HY |
251 | |
252 | lengths.a = cpu_to_be64(req->assoclen * 8); | |
253 | lengths.b = cpu_to_be64(gctx->cryptlen * 8); | |
254 | memcpy(pctx->iauth_tag, &lengths, 16); | |
adcbc688 HX |
255 | sg_init_one(&pctx->sg, pctx->iauth_tag, 16); |
256 | ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req); | |
257 | ahash_request_set_crypt(ahreq, &pctx->sg, | |
258 | pctx->iauth_tag, sizeof(lengths)); | |
9382d97a | 259 | |
adcbc688 | 260 | return crypto_ahash_finup(ahreq); |
9382d97a HY |
261 | } |
262 | ||
adcbc688 | 263 | static int gcm_hash_len_continue(struct aead_request *req, u32 flags) |
9382d97a | 264 | { |
2589469d | 265 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
266 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
267 | ||
adcbc688 | 268 | return gctx->complete(req, flags); |
9382d97a HY |
269 | } |
270 | ||
adcbc688 | 271 | static void gcm_hash_len_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
272 | { |
273 | struct aead_request *req = areq->data; | |
62c5593a | 274 | |
adcbc688 HX |
275 | if (err) |
276 | goto out; | |
9382d97a | 277 | |
adcbc688 HX |
278 | err = gcm_hash_len_continue(req, 0); |
279 | if (err == -EINPROGRESS) | |
280 | return; | |
62c5593a | 281 | |
adcbc688 HX |
282 | out: |
283 | aead_request_complete(req, err); | |
62c5593a HY |
284 | } |
285 | ||
adcbc688 | 286 | static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags) |
62c5593a | 287 | { |
adcbc688 HX |
288 | return gcm_hash_len(req, flags) ?: |
289 | gcm_hash_len_continue(req, flags); | |
9382d97a HY |
290 | } |
291 | ||
62c5593a HY |
292 | static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq, |
293 | int err) | |
9382d97a HY |
294 | { |
295 | struct aead_request *req = areq->data; | |
62c5593a | 296 | |
adcbc688 HX |
297 | if (err) |
298 | goto out; | |
299 | ||
300 | err = gcm_hash_crypt_remain_continue(req, 0); | |
301 | if (err == -EINPROGRESS) | |
302 | return; | |
303 | ||
304 | out: | |
305 | aead_request_complete(req, err); | |
62c5593a HY |
306 | } |
307 | ||
adcbc688 | 308 | static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags) |
62c5593a | 309 | { |
9382d97a HY |
310 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
311 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
312 | unsigned int remain; | |
313 | ||
adcbc688 HX |
314 | remain = gcm_remain(gctx->cryptlen); |
315 | if (remain) | |
316 | return gcm_hash_remain(req, remain, | |
317 | gcm_hash_crypt_remain_done, flags) ?: | |
318 | gcm_hash_crypt_remain_continue(req, flags); | |
9382d97a | 319 | |
adcbc688 | 320 | return gcm_hash_crypt_remain_continue(req, flags); |
9382d97a HY |
321 | } |
322 | ||
62c5593a | 323 | static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
324 | { |
325 | struct aead_request *req = areq->data; | |
62c5593a | 326 | |
adcbc688 HX |
327 | if (err) |
328 | goto out; | |
329 | ||
330 | err = gcm_hash_crypt_continue(req, 0); | |
331 | if (err == -EINPROGRESS) | |
332 | return; | |
333 | ||
334 | out: | |
335 | aead_request_complete(req, err); | |
62c5593a HY |
336 | } |
337 | ||
adcbc688 | 338 | static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags) |
62c5593a | 339 | { |
9382d97a HY |
340 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
341 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
9382d97a | 342 | |
adcbc688 HX |
343 | if (gctx->cryptlen) |
344 | return gcm_hash_update(req, gcm_hash_crypt_done, | |
345 | gctx->src, gctx->cryptlen, flags) ?: | |
346 | gcm_hash_crypt_continue(req, flags); | |
347 | ||
348 | return gcm_hash_crypt_remain_continue(req, flags); | |
9382d97a HY |
349 | } |
350 | ||
62c5593a HY |
351 | static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq, |
352 | int err) | |
9382d97a HY |
353 | { |
354 | struct aead_request *req = areq->data; | |
62c5593a | 355 | |
adcbc688 HX |
356 | if (err) |
357 | goto out; | |
358 | ||
359 | err = gcm_hash_assoc_remain_continue(req, 0); | |
360 | if (err == -EINPROGRESS) | |
361 | return; | |
362 | ||
363 | out: | |
364 | aead_request_complete(req, err); | |
62c5593a HY |
365 | } |
366 | ||
adcbc688 | 367 | static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags) |
62c5593a | 368 | { |
9382d97a HY |
369 | unsigned int remain; |
370 | ||
adcbc688 HX |
371 | remain = gcm_remain(req->assoclen); |
372 | if (remain) | |
373 | return gcm_hash_remain(req, remain, | |
374 | gcm_hash_assoc_remain_done, flags) ?: | |
375 | gcm_hash_assoc_remain_continue(req, flags); | |
9382d97a | 376 | |
adcbc688 | 377 | return gcm_hash_assoc_remain_continue(req, flags); |
9382d97a HY |
378 | } |
379 | ||
62c5593a | 380 | static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
381 | { |
382 | struct aead_request *req = areq->data; | |
62c5593a | 383 | |
adcbc688 HX |
384 | if (err) |
385 | goto out; | |
386 | ||
387 | err = gcm_hash_assoc_continue(req, 0); | |
388 | if (err == -EINPROGRESS) | |
389 | return; | |
390 | ||
391 | out: | |
392 | aead_request_complete(req, err); | |
62c5593a HY |
393 | } |
394 | ||
adcbc688 | 395 | static int gcm_hash_init_continue(struct aead_request *req, u32 flags) |
62c5593a | 396 | { |
adcbc688 HX |
397 | if (req->assoclen) |
398 | return gcm_hash_update(req, gcm_hash_assoc_done, | |
399 | req->src, req->assoclen, flags) ?: | |
400 | gcm_hash_assoc_continue(req, flags); | |
9382d97a | 401 | |
adcbc688 | 402 | return gcm_hash_assoc_remain_continue(req, flags); |
62c5593a HY |
403 | } |
404 | ||
405 | static void gcm_hash_init_done(struct crypto_async_request *areq, int err) | |
406 | { | |
407 | struct aead_request *req = areq->data; | |
408 | ||
adcbc688 HX |
409 | if (err) |
410 | goto out; | |
411 | ||
412 | err = gcm_hash_init_continue(req, 0); | |
413 | if (err == -EINPROGRESS) | |
414 | return; | |
415 | ||
416 | out: | |
417 | aead_request_complete(req, err); | |
9382d97a HY |
418 | } |
419 | ||
adcbc688 | 420 | static int gcm_hash(struct aead_request *req, u32 flags) |
9382d97a | 421 | { |
adcbc688 | 422 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a | 423 | struct ahash_request *ahreq = &pctx->u.ahreq; |
adcbc688 | 424 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
9382d97a HY |
425 | |
426 | ahash_request_set_tfm(ahreq, ctx->ghash); | |
427 | ||
adcbc688 HX |
428 | ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req); |
429 | return crypto_ahash_init(ahreq) ?: | |
430 | gcm_hash_init_continue(req, flags); | |
9382d97a HY |
431 | } |
432 | ||
adcbc688 | 433 | static int gcm_enc_copy_hash(struct aead_request *req, u32 flags) |
9382d97a | 434 | { |
adcbc688 | 435 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
436 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
437 | u8 *auth_tag = pctx->auth_tag; | |
28db8e3e | 438 | |
adcbc688 HX |
439 | crypto_xor(auth_tag, pctx->iauth_tag, 16); |
440 | scatterwalk_map_and_copy(auth_tag, req->dst, | |
441 | req->assoclen + req->cryptlen, | |
6160b289 | 442 | crypto_aead_authsize(aead), 1); |
adcbc688 | 443 | return 0; |
6160b289 HX |
444 | } |
445 | ||
adcbc688 | 446 | static int gcm_encrypt_continue(struct aead_request *req, u32 flags) |
6160b289 | 447 | { |
9382d97a | 448 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
adcbc688 | 449 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
6160b289 | 450 | |
adcbc688 HX |
451 | gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst); |
452 | gctx->cryptlen = req->cryptlen; | |
453 | gctx->complete = gcm_enc_copy_hash; | |
6160b289 | 454 | |
adcbc688 | 455 | return gcm_hash(req, flags); |
28db8e3e MH |
456 | } |
457 | ||
62c5593a | 458 | static void gcm_encrypt_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
459 | { |
460 | struct aead_request *req = areq->data; | |
9382d97a | 461 | |
adcbc688 HX |
462 | if (err) |
463 | goto out; | |
464 | ||
465 | err = gcm_encrypt_continue(req, 0); | |
466 | if (err == -EINPROGRESS) | |
467 | return; | |
9382d97a | 468 | |
adcbc688 | 469 | out: |
62c5593a | 470 | aead_request_complete(req, err); |
9382d97a HY |
471 | } |
472 | ||
28db8e3e MH |
473 | static int crypto_gcm_encrypt(struct aead_request *req) |
474 | { | |
2589469d | 475 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
16f37ecd | 476 | struct skcipher_request *skreq = &pctx->u.skreq; |
adcbc688 | 477 | u32 flags = aead_request_flags(req); |
9382d97a | 478 | |
adcbc688 HX |
479 | crypto_gcm_init_common(req); |
480 | crypto_gcm_init_crypt(req, req->cryptlen); | |
16f37ecd | 481 | skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req); |
9382d97a | 482 | |
16f37ecd | 483 | return crypto_skcipher_encrypt(skreq) ?: |
adcbc688 | 484 | gcm_encrypt_continue(req, flags); |
28db8e3e MH |
485 | } |
486 | ||
adcbc688 | 487 | static int crypto_gcm_verify(struct aead_request *req) |
84c91152 | 488 | { |
adcbc688 | 489 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
84c91152 | 490 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
84c91152 HX |
491 | u8 *auth_tag = pctx->auth_tag; |
492 | u8 *iauth_tag = pctx->iauth_tag; | |
493 | unsigned int authsize = crypto_aead_authsize(aead); | |
494 | unsigned int cryptlen = req->cryptlen - authsize; | |
495 | ||
9382d97a | 496 | crypto_xor(auth_tag, iauth_tag, 16); |
adcbc688 HX |
497 | scatterwalk_map_and_copy(iauth_tag, req->src, |
498 | req->assoclen + cryptlen, authsize, 0); | |
6bf37e5a | 499 | return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0; |
84c91152 HX |
500 | } |
501 | ||
9382d97a | 502 | static void gcm_decrypt_done(struct crypto_async_request *areq, int err) |
28db8e3e | 503 | { |
84c91152 HX |
504 | struct aead_request *req = areq->data; |
505 | ||
506 | if (!err) | |
adcbc688 | 507 | err = crypto_gcm_verify(req); |
84c91152 HX |
508 | |
509 | aead_request_complete(req, err); | |
28db8e3e MH |
510 | } |
511 | ||
adcbc688 | 512 | static int gcm_dec_hash_continue(struct aead_request *req, u32 flags) |
9382d97a | 513 | { |
9382d97a | 514 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
16f37ecd | 515 | struct skcipher_request *skreq = &pctx->u.skreq; |
9382d97a HY |
516 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
517 | ||
adcbc688 | 518 | crypto_gcm_init_crypt(req, gctx->cryptlen); |
16f37ecd HX |
519 | skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req); |
520 | return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req); | |
9382d97a HY |
521 | } |
522 | ||
28db8e3e MH |
523 | static int crypto_gcm_decrypt(struct aead_request *req) |
524 | { | |
6160b289 | 525 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
2589469d | 526 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a | 527 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
6160b289 | 528 | unsigned int authsize = crypto_aead_authsize(aead); |
9382d97a | 529 | unsigned int cryptlen = req->cryptlen; |
adcbc688 | 530 | u32 flags = aead_request_flags(req); |
28db8e3e | 531 | |
6160b289 | 532 | cryptlen -= authsize; |
28db8e3e | 533 | |
adcbc688 | 534 | crypto_gcm_init_common(req); |
28db8e3e | 535 | |
adcbc688 HX |
536 | gctx->src = sg_next(pctx->src); |
537 | gctx->cryptlen = cryptlen; | |
538 | gctx->complete = gcm_dec_hash_continue; | |
28db8e3e | 539 | |
adcbc688 | 540 | return gcm_hash(req, flags); |
28db8e3e MH |
541 | } |
542 | ||
adcbc688 | 543 | static int crypto_gcm_init_tfm(struct crypto_aead *tfm) |
28db8e3e | 544 | { |
adcbc688 HX |
545 | struct aead_instance *inst = aead_alg_instance(tfm); |
546 | struct gcm_instance_ctx *ictx = aead_instance_ctx(inst); | |
547 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm); | |
16f37ecd | 548 | struct crypto_skcipher *ctr; |
9382d97a | 549 | struct crypto_ahash *ghash; |
28db8e3e MH |
550 | unsigned long align; |
551 | int err; | |
552 | ||
9382d97a HY |
553 | ghash = crypto_spawn_ahash(&ictx->ghash); |
554 | if (IS_ERR(ghash)) | |
555 | return PTR_ERR(ghash); | |
556 | ||
60425a8b | 557 | ctr = crypto_spawn_skcipher(&ictx->ctr); |
28db8e3e MH |
558 | err = PTR_ERR(ctr); |
559 | if (IS_ERR(ctr)) | |
9382d97a | 560 | goto err_free_hash; |
28db8e3e MH |
561 | |
562 | ctx->ctr = ctr; | |
9382d97a | 563 | ctx->ghash = ghash; |
28db8e3e | 564 | |
adcbc688 | 565 | align = crypto_aead_alignmask(tfm); |
28db8e3e | 566 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
adcbc688 | 567 | crypto_aead_set_reqsize(tfm, |
5d72336f | 568 | align + offsetof(struct crypto_gcm_req_priv_ctx, u) + |
16f37ecd HX |
569 | max(sizeof(struct skcipher_request) + |
570 | crypto_skcipher_reqsize(ctr), | |
9382d97a | 571 | sizeof(struct ahash_request) + |
5d72336f | 572 | crypto_ahash_reqsize(ghash))); |
28db8e3e MH |
573 | |
574 | return 0; | |
9382d97a HY |
575 | |
576 | err_free_hash: | |
577 | crypto_free_ahash(ghash); | |
578 | return err; | |
28db8e3e MH |
579 | } |
580 | ||
adcbc688 | 581 | static void crypto_gcm_exit_tfm(struct crypto_aead *tfm) |
28db8e3e | 582 | { |
adcbc688 | 583 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm); |
28db8e3e | 584 | |
9382d97a | 585 | crypto_free_ahash(ctx->ghash); |
16f37ecd | 586 | crypto_free_skcipher(ctx->ctr); |
28db8e3e MH |
587 | } |
588 | ||
7b05a373 HX |
589 | static void crypto_gcm_free(struct aead_instance *inst) |
590 | { | |
591 | struct gcm_instance_ctx *ctx = aead_instance_ctx(inst); | |
592 | ||
593 | crypto_drop_skcipher(&ctx->ctr); | |
594 | crypto_drop_ahash(&ctx->ghash); | |
595 | kfree(inst); | |
596 | } | |
597 | ||
adcbc688 HX |
598 | static int crypto_gcm_create_common(struct crypto_template *tmpl, |
599 | struct rtattr **tb, | |
adcbc688 HX |
600 | const char *ctr_name, |
601 | const char *ghash_name) | |
28db8e3e | 602 | { |
d00aa19b | 603 | struct crypto_attr_type *algt; |
adcbc688 | 604 | struct aead_instance *inst; |
16f37ecd | 605 | struct skcipher_alg *ctr; |
9382d97a | 606 | struct crypto_alg *ghash_alg; |
adcbc688 | 607 | struct hash_alg_common *ghash; |
28db8e3e MH |
608 | struct gcm_instance_ctx *ctx; |
609 | int err; | |
28db8e3e | 610 | |
d00aa19b | 611 | algt = crypto_get_attr_type(tb); |
d00aa19b | 612 | if (IS_ERR(algt)) |
adcbc688 | 613 | return PTR_ERR(algt); |
28db8e3e | 614 | |
5e4b8c1f | 615 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
adcbc688 | 616 | return -EINVAL; |
28db8e3e | 617 | |
9382d97a HY |
618 | ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type, |
619 | CRYPTO_ALG_TYPE_HASH, | |
b30bdfa8 HX |
620 | CRYPTO_ALG_TYPE_AHASH_MASK | |
621 | crypto_requires_sync(algt->type, | |
622 | algt->mask)); | |
9382d97a | 623 | if (IS_ERR(ghash_alg)) |
adcbc688 HX |
624 | return PTR_ERR(ghash_alg); |
625 | ||
626 | ghash = __crypto_hash_alg_common(ghash_alg); | |
9382d97a HY |
627 | |
628 | err = -ENOMEM; | |
1472e5eb HX |
629 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
630 | if (!inst) | |
9382d97a | 631 | goto out_put_ghash; |
28db8e3e | 632 | |
adcbc688 HX |
633 | ctx = aead_instance_ctx(inst); |
634 | err = crypto_init_ahash_spawn(&ctx->ghash, ghash, | |
635 | aead_crypto_instance(inst)); | |
9382d97a HY |
636 | if (err) |
637 | goto err_free_inst; | |
638 | ||
adcbc688 | 639 | err = -EINVAL; |
f699594d EB |
640 | if (strcmp(ghash->base.cra_name, "ghash") != 0 || |
641 | ghash->digestsize != 16) | |
adcbc688 HX |
642 | goto err_drop_ghash; |
643 | ||
644 | crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst)); | |
a35528ec EB |
645 | err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0, |
646 | crypto_requires_sync(algt->type, | |
647 | algt->mask)); | |
1472e5eb | 648 | if (err) |
9382d97a | 649 | goto err_drop_ghash; |
1472e5eb | 650 | |
16f37ecd | 651 | ctr = crypto_spawn_skcipher_alg(&ctx->ctr); |
28db8e3e | 652 | |
f699594d | 653 | /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */ |
9b40f79c | 654 | err = -EINVAL; |
f699594d EB |
655 | if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 || |
656 | crypto_skcipher_alg_ivsize(ctr) != 16 || | |
657 | ctr->base.cra_blocksize != 1) | |
d00aa19b HX |
658 | goto out_put_ctr; |
659 | ||
f699594d EB |
660 | err = -ENAMETOOLONG; |
661 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, | |
662 | "gcm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME) | |
28db8e3e MH |
663 | goto out_put_ctr; |
664 | ||
adcbc688 | 665 | if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
16f37ecd | 666 | "gcm_base(%s,%s)", ctr->base.cra_driver_name, |
9382d97a | 667 | ghash_alg->cra_driver_name) >= |
d00aa19b | 668 | CRYPTO_MAX_ALG_NAME) |
1472e5eb | 669 | goto out_put_ctr; |
28db8e3e | 670 | |
16f37ecd HX |
671 | inst->alg.base.cra_flags = (ghash->base.cra_flags | |
672 | ctr->base.cra_flags) & CRYPTO_ALG_ASYNC; | |
adcbc688 | 673 | inst->alg.base.cra_priority = (ghash->base.cra_priority + |
16f37ecd | 674 | ctr->base.cra_priority) / 2; |
adcbc688 HX |
675 | inst->alg.base.cra_blocksize = 1; |
676 | inst->alg.base.cra_alignmask = ghash->base.cra_alignmask | | |
16f37ecd | 677 | ctr->base.cra_alignmask; |
adcbc688 | 678 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx); |
e0ab7e9c | 679 | inst->alg.ivsize = GCM_AES_IV_SIZE; |
16f37ecd | 680 | inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr); |
adcbc688 HX |
681 | inst->alg.maxauthsize = 16; |
682 | inst->alg.init = crypto_gcm_init_tfm; | |
683 | inst->alg.exit = crypto_gcm_exit_tfm; | |
684 | inst->alg.setkey = crypto_gcm_setkey; | |
685 | inst->alg.setauthsize = crypto_gcm_setauthsize; | |
686 | inst->alg.encrypt = crypto_gcm_encrypt; | |
687 | inst->alg.decrypt = crypto_gcm_decrypt; | |
688 | ||
7b05a373 HX |
689 | inst->free = crypto_gcm_free; |
690 | ||
adcbc688 HX |
691 | err = aead_register_instance(tmpl, inst); |
692 | if (err) | |
693 | goto out_put_ctr; | |
28db8e3e | 694 | |
adcbc688 | 695 | out_put_ghash: |
9382d97a | 696 | crypto_mod_put(ghash_alg); |
adcbc688 | 697 | return err; |
1472e5eb HX |
698 | |
699 | out_put_ctr: | |
700 | crypto_drop_skcipher(&ctx->ctr); | |
9382d97a HY |
701 | err_drop_ghash: |
702 | crypto_drop_ahash(&ctx->ghash); | |
28db8e3e MH |
703 | err_free_inst: |
704 | kfree(inst); | |
adcbc688 | 705 | goto out_put_ghash; |
28db8e3e MH |
706 | } |
707 | ||
adcbc688 | 708 | static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb) |
d00aa19b | 709 | { |
d00aa19b HX |
710 | const char *cipher_name; |
711 | char ctr_name[CRYPTO_MAX_ALG_NAME]; | |
d00aa19b HX |
712 | |
713 | cipher_name = crypto_attr_alg_name(tb[1]); | |
d00aa19b | 714 | if (IS_ERR(cipher_name)) |
adcbc688 | 715 | return PTR_ERR(cipher_name); |
d00aa19b HX |
716 | |
717 | if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >= | |
718 | CRYPTO_MAX_ALG_NAME) | |
adcbc688 | 719 | return -ENAMETOOLONG; |
d00aa19b | 720 | |
f699594d | 721 | return crypto_gcm_create_common(tmpl, tb, ctr_name, "ghash"); |
d00aa19b HX |
722 | } |
723 | ||
adcbc688 HX |
724 | static int crypto_gcm_base_create(struct crypto_template *tmpl, |
725 | struct rtattr **tb) | |
d00aa19b | 726 | { |
d00aa19b | 727 | const char *ctr_name; |
9382d97a | 728 | const char *ghash_name; |
d00aa19b HX |
729 | |
730 | ctr_name = crypto_attr_alg_name(tb[1]); | |
d00aa19b | 731 | if (IS_ERR(ctr_name)) |
adcbc688 | 732 | return PTR_ERR(ctr_name); |
d00aa19b | 733 | |
9382d97a | 734 | ghash_name = crypto_attr_alg_name(tb[2]); |
9382d97a | 735 | if (IS_ERR(ghash_name)) |
adcbc688 | 736 | return PTR_ERR(ghash_name); |
9382d97a | 737 | |
f699594d | 738 | return crypto_gcm_create_common(tmpl, tb, ctr_name, ghash_name); |
d00aa19b HX |
739 | } |
740 | ||
dadbc53d HX |
741 | static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key, |
742 | unsigned int keylen) | |
743 | { | |
744 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); | |
745 | struct crypto_aead *child = ctx->child; | |
746 | int err; | |
747 | ||
748 | if (keylen < 4) | |
749 | return -EINVAL; | |
750 | ||
751 | keylen -= 4; | |
752 | memcpy(ctx->nonce, key + keylen, 4); | |
753 | ||
754 | crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
755 | crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & | |
756 | CRYPTO_TFM_REQ_MASK); | |
757 | err = crypto_aead_setkey(child, key, keylen); | |
758 | crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & | |
759 | CRYPTO_TFM_RES_MASK); | |
760 | ||
761 | return err; | |
762 | } | |
763 | ||
764 | static int crypto_rfc4106_setauthsize(struct crypto_aead *parent, | |
765 | unsigned int authsize) | |
766 | { | |
767 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); | |
768 | ||
769 | switch (authsize) { | |
770 | case 8: | |
771 | case 12: | |
772 | case 16: | |
773 | break; | |
774 | default: | |
775 | return -EINVAL; | |
776 | } | |
777 | ||
778 | return crypto_aead_setauthsize(ctx->child, authsize); | |
779 | } | |
780 | ||
781 | static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req) | |
782 | { | |
7b05a373 | 783 | struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req); |
dadbc53d HX |
784 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
785 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead); | |
7b05a373 | 786 | struct aead_request *subreq = &rctx->subreq; |
dadbc53d | 787 | struct crypto_aead *child = ctx->child; |
7b05a373 | 788 | struct scatterlist *sg; |
dadbc53d HX |
789 | u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child), |
790 | crypto_aead_alignmask(child) + 1); | |
791 | ||
e0ab7e9c | 792 | scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0); |
7b05a373 | 793 | |
dadbc53d HX |
794 | memcpy(iv, ctx->nonce, 4); |
795 | memcpy(iv + 4, req->iv, 8); | |
796 | ||
7b05a373 | 797 | sg_init_table(rctx->src, 3); |
e0ab7e9c | 798 | sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8); |
7b05a373 HX |
799 | sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen); |
800 | if (sg != rctx->src + 1) | |
801 | sg_chain(rctx->src, 2, sg); | |
802 | ||
803 | if (req->src != req->dst) { | |
804 | sg_init_table(rctx->dst, 3); | |
e0ab7e9c | 805 | sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8); |
7b05a373 HX |
806 | sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen); |
807 | if (sg != rctx->dst + 1) | |
808 | sg_chain(rctx->dst, 2, sg); | |
809 | } | |
810 | ||
dadbc53d HX |
811 | aead_request_set_tfm(subreq, child); |
812 | aead_request_set_callback(subreq, req->base.flags, req->base.complete, | |
813 | req->base.data); | |
7b05a373 HX |
814 | aead_request_set_crypt(subreq, rctx->src, |
815 | req->src == req->dst ? rctx->src : rctx->dst, | |
816 | req->cryptlen, iv); | |
817 | aead_request_set_ad(subreq, req->assoclen - 8); | |
dadbc53d HX |
818 | |
819 | return subreq; | |
820 | } | |
821 | ||
822 | static int crypto_rfc4106_encrypt(struct aead_request *req) | |
823 | { | |
7b05a373 HX |
824 | if (req->assoclen != 16 && req->assoclen != 20) |
825 | return -EINVAL; | |
826 | ||
dadbc53d HX |
827 | req = crypto_rfc4106_crypt(req); |
828 | ||
829 | return crypto_aead_encrypt(req); | |
830 | } | |
831 | ||
832 | static int crypto_rfc4106_decrypt(struct aead_request *req) | |
833 | { | |
7b05a373 HX |
834 | if (req->assoclen != 16 && req->assoclen != 20) |
835 | return -EINVAL; | |
836 | ||
dadbc53d HX |
837 | req = crypto_rfc4106_crypt(req); |
838 | ||
839 | return crypto_aead_decrypt(req); | |
840 | } | |
841 | ||
adcbc688 | 842 | static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm) |
dadbc53d | 843 | { |
adcbc688 HX |
844 | struct aead_instance *inst = aead_alg_instance(tfm); |
845 | struct crypto_aead_spawn *spawn = aead_instance_ctx(inst); | |
846 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm); | |
dadbc53d HX |
847 | struct crypto_aead *aead; |
848 | unsigned long align; | |
849 | ||
850 | aead = crypto_spawn_aead(spawn); | |
851 | if (IS_ERR(aead)) | |
852 | return PTR_ERR(aead); | |
853 | ||
854 | ctx->child = aead; | |
855 | ||
856 | align = crypto_aead_alignmask(aead); | |
857 | align &= ~(crypto_tfm_ctx_alignment() - 1); | |
adcbc688 HX |
858 | crypto_aead_set_reqsize( |
859 | tfm, | |
7b05a373 | 860 | sizeof(struct crypto_rfc4106_req_ctx) + |
5d72336f | 861 | ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + |
7b05a373 | 862 | align + 24); |
dadbc53d HX |
863 | |
864 | return 0; | |
865 | } | |
866 | ||
adcbc688 | 867 | static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm) |
dadbc53d | 868 | { |
adcbc688 | 869 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm); |
dadbc53d HX |
870 | |
871 | crypto_free_aead(ctx->child); | |
872 | } | |
873 | ||
7b05a373 HX |
874 | static void crypto_rfc4106_free(struct aead_instance *inst) |
875 | { | |
876 | crypto_drop_aead(aead_instance_ctx(inst)); | |
877 | kfree(inst); | |
878 | } | |
879 | ||
adcbc688 HX |
880 | static int crypto_rfc4106_create(struct crypto_template *tmpl, |
881 | struct rtattr **tb) | |
dadbc53d HX |
882 | { |
883 | struct crypto_attr_type *algt; | |
adcbc688 | 884 | struct aead_instance *inst; |
dadbc53d | 885 | struct crypto_aead_spawn *spawn; |
adcbc688 | 886 | struct aead_alg *alg; |
dadbc53d HX |
887 | const char *ccm_name; |
888 | int err; | |
889 | ||
890 | algt = crypto_get_attr_type(tb); | |
dadbc53d | 891 | if (IS_ERR(algt)) |
adcbc688 | 892 | return PTR_ERR(algt); |
dadbc53d | 893 | |
5e4b8c1f | 894 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
adcbc688 | 895 | return -EINVAL; |
dadbc53d HX |
896 | |
897 | ccm_name = crypto_attr_alg_name(tb[1]); | |
dadbc53d | 898 | if (IS_ERR(ccm_name)) |
adcbc688 | 899 | return PTR_ERR(ccm_name); |
dadbc53d HX |
900 | |
901 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
902 | if (!inst) | |
adcbc688 | 903 | return -ENOMEM; |
dadbc53d | 904 | |
adcbc688 HX |
905 | spawn = aead_instance_ctx(inst); |
906 | crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); | |
dadbc53d HX |
907 | err = crypto_grab_aead(spawn, ccm_name, 0, |
908 | crypto_requires_sync(algt->type, algt->mask)); | |
909 | if (err) | |
910 | goto out_free_inst; | |
911 | ||
adcbc688 | 912 | alg = crypto_spawn_aead_alg(spawn); |
dadbc53d HX |
913 | |
914 | err = -EINVAL; | |
915 | ||
adcbc688 | 916 | /* Underlying IV size must be 12. */ |
e0ab7e9c | 917 | if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE) |
dadbc53d HX |
918 | goto out_drop_alg; |
919 | ||
920 | /* Not a stream cipher? */ | |
adcbc688 | 921 | if (alg->base.cra_blocksize != 1) |
dadbc53d HX |
922 | goto out_drop_alg; |
923 | ||
924 | err = -ENAMETOOLONG; | |
adcbc688 HX |
925 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
926 | "rfc4106(%s)", alg->base.cra_name) >= | |
927 | CRYPTO_MAX_ALG_NAME || | |
928 | snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
929 | "rfc4106(%s)", alg->base.cra_driver_name) >= | |
dadbc53d HX |
930 | CRYPTO_MAX_ALG_NAME) |
931 | goto out_drop_alg; | |
932 | ||
7b05a373 | 933 | inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
adcbc688 HX |
934 | inst->alg.base.cra_priority = alg->base.cra_priority; |
935 | inst->alg.base.cra_blocksize = 1; | |
936 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask; | |
dadbc53d | 937 | |
adcbc688 | 938 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx); |
dadbc53d | 939 | |
e0ab7e9c | 940 | inst->alg.ivsize = GCM_RFC4106_IV_SIZE; |
16f37ecd | 941 | inst->alg.chunksize = crypto_aead_alg_chunksize(alg); |
adcbc688 | 942 | inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); |
dadbc53d | 943 | |
adcbc688 HX |
944 | inst->alg.init = crypto_rfc4106_init_tfm; |
945 | inst->alg.exit = crypto_rfc4106_exit_tfm; | |
dadbc53d | 946 | |
adcbc688 HX |
947 | inst->alg.setkey = crypto_rfc4106_setkey; |
948 | inst->alg.setauthsize = crypto_rfc4106_setauthsize; | |
949 | inst->alg.encrypt = crypto_rfc4106_encrypt; | |
950 | inst->alg.decrypt = crypto_rfc4106_decrypt; | |
dadbc53d | 951 | |
7b05a373 HX |
952 | inst->free = crypto_rfc4106_free; |
953 | ||
adcbc688 HX |
954 | err = aead_register_instance(tmpl, inst); |
955 | if (err) | |
956 | goto out_drop_alg; | |
dadbc53d HX |
957 | |
958 | out: | |
adcbc688 | 959 | return err; |
dadbc53d HX |
960 | |
961 | out_drop_alg: | |
962 | crypto_drop_aead(spawn); | |
963 | out_free_inst: | |
964 | kfree(inst); | |
dadbc53d HX |
965 | goto out; |
966 | } | |
967 | ||
73c89c15 TB |
968 | static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key, |
969 | unsigned int keylen) | |
970 | { | |
971 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent); | |
972 | struct crypto_aead *child = ctx->child; | |
973 | int err; | |
974 | ||
975 | if (keylen < 4) | |
976 | return -EINVAL; | |
977 | ||
978 | keylen -= 4; | |
979 | memcpy(ctx->nonce, key + keylen, 4); | |
980 | ||
981 | crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
982 | crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & | |
983 | CRYPTO_TFM_REQ_MASK); | |
984 | err = crypto_aead_setkey(child, key, keylen); | |
985 | crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & | |
986 | CRYPTO_TFM_RES_MASK); | |
987 | ||
988 | return err; | |
989 | } | |
990 | ||
991 | static int crypto_rfc4543_setauthsize(struct crypto_aead *parent, | |
992 | unsigned int authsize) | |
993 | { | |
994 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent); | |
995 | ||
996 | if (authsize != 16) | |
997 | return -EINVAL; | |
998 | ||
999 | return crypto_aead_setauthsize(ctx->child, authsize); | |
1000 | } | |
1001 | ||
adcbc688 | 1002 | static int crypto_rfc4543_crypt(struct aead_request *req, bool enc) |
73c89c15 TB |
1003 | { |
1004 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
1005 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead); | |
adcbc688 | 1006 | struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req); |
73c89c15 | 1007 | struct aead_request *subreq = &rctx->subreq; |
73c89c15 | 1008 | unsigned int authsize = crypto_aead_authsize(aead); |
73c89c15 TB |
1009 | u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child), |
1010 | crypto_aead_alignmask(ctx->child) + 1); | |
adcbc688 HX |
1011 | int err; |
1012 | ||
1013 | if (req->src != req->dst) { | |
1014 | err = crypto_rfc4543_copy_src_to_dst(req, enc); | |
1015 | if (err) | |
1016 | return err; | |
1017 | } | |
73c89c15 TB |
1018 | |
1019 | memcpy(iv, ctx->nonce, 4); | |
1020 | memcpy(iv + 4, req->iv, 8); | |
1021 | ||
73c89c15 | 1022 | aead_request_set_tfm(subreq, ctx->child); |
adcbc688 HX |
1023 | aead_request_set_callback(subreq, req->base.flags, |
1024 | req->base.complete, req->base.data); | |
1025 | aead_request_set_crypt(subreq, req->src, req->dst, | |
1026 | enc ? 0 : authsize, iv); | |
1027 | aead_request_set_ad(subreq, req->assoclen + req->cryptlen - | |
1028 | subreq->cryptlen); | |
1029 | ||
1030 | return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq); | |
73c89c15 TB |
1031 | } |
1032 | ||
9489667d JK |
1033 | static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc) |
1034 | { | |
1035 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
1036 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead); | |
1037 | unsigned int authsize = crypto_aead_authsize(aead); | |
adcbc688 HX |
1038 | unsigned int nbytes = req->assoclen + req->cryptlen - |
1039 | (enc ? 0 : authsize); | |
8d605398 | 1040 | SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null); |
16f37ecd | 1041 | |
8d605398 | 1042 | skcipher_request_set_sync_tfm(nreq, ctx->null); |
16f37ecd HX |
1043 | skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL); |
1044 | skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL); | |
9489667d | 1045 | |
16f37ecd | 1046 | return crypto_skcipher_encrypt(nreq); |
9489667d JK |
1047 | } |
1048 | ||
73c89c15 TB |
1049 | static int crypto_rfc4543_encrypt(struct aead_request *req) |
1050 | { | |
adcbc688 | 1051 | return crypto_rfc4543_crypt(req, true); |
73c89c15 TB |
1052 | } |
1053 | ||
1054 | static int crypto_rfc4543_decrypt(struct aead_request *req) | |
1055 | { | |
adcbc688 | 1056 | return crypto_rfc4543_crypt(req, false); |
73c89c15 TB |
1057 | } |
1058 | ||
adcbc688 | 1059 | static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm) |
73c89c15 | 1060 | { |
adcbc688 HX |
1061 | struct aead_instance *inst = aead_alg_instance(tfm); |
1062 | struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst); | |
9489667d | 1063 | struct crypto_aead_spawn *spawn = &ictx->aead; |
adcbc688 | 1064 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm); |
73c89c15 | 1065 | struct crypto_aead *aead; |
8d605398 | 1066 | struct crypto_sync_skcipher *null; |
73c89c15 | 1067 | unsigned long align; |
9489667d | 1068 | int err = 0; |
73c89c15 TB |
1069 | |
1070 | aead = crypto_spawn_aead(spawn); | |
1071 | if (IS_ERR(aead)) | |
1072 | return PTR_ERR(aead); | |
1073 | ||
3a2d4fb5 | 1074 | null = crypto_get_default_null_skcipher(); |
9489667d JK |
1075 | err = PTR_ERR(null); |
1076 | if (IS_ERR(null)) | |
1077 | goto err_free_aead; | |
1078 | ||
73c89c15 | 1079 | ctx->child = aead; |
9489667d | 1080 | ctx->null = null; |
73c89c15 TB |
1081 | |
1082 | align = crypto_aead_alignmask(aead); | |
1083 | align &= ~(crypto_tfm_ctx_alignment() - 1); | |
adcbc688 HX |
1084 | crypto_aead_set_reqsize( |
1085 | tfm, | |
5d72336f HX |
1086 | sizeof(struct crypto_rfc4543_req_ctx) + |
1087 | ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + | |
e0ab7e9c | 1088 | align + GCM_AES_IV_SIZE); |
73c89c15 TB |
1089 | |
1090 | return 0; | |
9489667d JK |
1091 | |
1092 | err_free_aead: | |
1093 | crypto_free_aead(aead); | |
1094 | return err; | |
73c89c15 TB |
1095 | } |
1096 | ||
adcbc688 | 1097 | static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm) |
73c89c15 | 1098 | { |
adcbc688 | 1099 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm); |
73c89c15 TB |
1100 | |
1101 | crypto_free_aead(ctx->child); | |
3a2d4fb5 | 1102 | crypto_put_default_null_skcipher(); |
73c89c15 TB |
1103 | } |
1104 | ||
7b05a373 HX |
1105 | static void crypto_rfc4543_free(struct aead_instance *inst) |
1106 | { | |
1107 | struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst); | |
1108 | ||
1109 | crypto_drop_aead(&ctx->aead); | |
1110 | ||
1111 | kfree(inst); | |
1112 | } | |
1113 | ||
adcbc688 HX |
1114 | static int crypto_rfc4543_create(struct crypto_template *tmpl, |
1115 | struct rtattr **tb) | |
73c89c15 TB |
1116 | { |
1117 | struct crypto_attr_type *algt; | |
adcbc688 | 1118 | struct aead_instance *inst; |
73c89c15 | 1119 | struct crypto_aead_spawn *spawn; |
adcbc688 | 1120 | struct aead_alg *alg; |
9489667d | 1121 | struct crypto_rfc4543_instance_ctx *ctx; |
73c89c15 TB |
1122 | const char *ccm_name; |
1123 | int err; | |
1124 | ||
1125 | algt = crypto_get_attr_type(tb); | |
73c89c15 | 1126 | if (IS_ERR(algt)) |
adcbc688 | 1127 | return PTR_ERR(algt); |
73c89c15 | 1128 | |
5e4b8c1f | 1129 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
adcbc688 | 1130 | return -EINVAL; |
73c89c15 TB |
1131 | |
1132 | ccm_name = crypto_attr_alg_name(tb[1]); | |
73c89c15 | 1133 | if (IS_ERR(ccm_name)) |
adcbc688 | 1134 | return PTR_ERR(ccm_name); |
73c89c15 | 1135 | |
9489667d | 1136 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
73c89c15 | 1137 | if (!inst) |
adcbc688 | 1138 | return -ENOMEM; |
73c89c15 | 1139 | |
adcbc688 | 1140 | ctx = aead_instance_ctx(inst); |
9489667d | 1141 | spawn = &ctx->aead; |
adcbc688 | 1142 | crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); |
73c89c15 TB |
1143 | err = crypto_grab_aead(spawn, ccm_name, 0, |
1144 | crypto_requires_sync(algt->type, algt->mask)); | |
1145 | if (err) | |
1146 | goto out_free_inst; | |
1147 | ||
adcbc688 | 1148 | alg = crypto_spawn_aead_alg(spawn); |
73c89c15 TB |
1149 | |
1150 | err = -EINVAL; | |
1151 | ||
adcbc688 | 1152 | /* Underlying IV size must be 12. */ |
e0ab7e9c | 1153 | if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE) |
17db8546 | 1154 | goto out_drop_alg; |
73c89c15 TB |
1155 | |
1156 | /* Not a stream cipher? */ | |
adcbc688 | 1157 | if (alg->base.cra_blocksize != 1) |
17db8546 | 1158 | goto out_drop_alg; |
73c89c15 TB |
1159 | |
1160 | err = -ENAMETOOLONG; | |
adcbc688 HX |
1161 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
1162 | "rfc4543(%s)", alg->base.cra_name) >= | |
1163 | CRYPTO_MAX_ALG_NAME || | |
1164 | snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
1165 | "rfc4543(%s)", alg->base.cra_driver_name) >= | |
73c89c15 | 1166 | CRYPTO_MAX_ALG_NAME) |
17db8546 | 1167 | goto out_drop_alg; |
73c89c15 | 1168 | |
adcbc688 HX |
1169 | inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
1170 | inst->alg.base.cra_priority = alg->base.cra_priority; | |
1171 | inst->alg.base.cra_blocksize = 1; | |
1172 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask; | |
73c89c15 | 1173 | |
adcbc688 | 1174 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx); |
73c89c15 | 1175 | |
e0ab7e9c | 1176 | inst->alg.ivsize = GCM_RFC4543_IV_SIZE; |
16f37ecd | 1177 | inst->alg.chunksize = crypto_aead_alg_chunksize(alg); |
adcbc688 | 1178 | inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); |
73c89c15 | 1179 | |
adcbc688 HX |
1180 | inst->alg.init = crypto_rfc4543_init_tfm; |
1181 | inst->alg.exit = crypto_rfc4543_exit_tfm; | |
73c89c15 | 1182 | |
adcbc688 HX |
1183 | inst->alg.setkey = crypto_rfc4543_setkey; |
1184 | inst->alg.setauthsize = crypto_rfc4543_setauthsize; | |
1185 | inst->alg.encrypt = crypto_rfc4543_encrypt; | |
1186 | inst->alg.decrypt = crypto_rfc4543_decrypt; | |
73c89c15 | 1187 | |
7b05a373 HX |
1188 | inst->free = crypto_rfc4543_free, |
1189 | ||
adcbc688 HX |
1190 | err = aead_register_instance(tmpl, inst); |
1191 | if (err) | |
1192 | goto out_drop_alg; | |
73c89c15 TB |
1193 | |
1194 | out: | |
adcbc688 | 1195 | return err; |
73c89c15 TB |
1196 | |
1197 | out_drop_alg: | |
1198 | crypto_drop_aead(spawn); | |
1199 | out_free_inst: | |
1200 | kfree(inst); | |
73c89c15 TB |
1201 | goto out; |
1202 | } | |
1203 | ||
56a00d9d XW |
1204 | static struct crypto_template crypto_gcm_tmpls[] = { |
1205 | { | |
1206 | .name = "gcm_base", | |
1207 | .create = crypto_gcm_base_create, | |
1208 | .module = THIS_MODULE, | |
1209 | }, { | |
1210 | .name = "gcm", | |
1211 | .create = crypto_gcm_create, | |
1212 | .module = THIS_MODULE, | |
1213 | }, { | |
1214 | .name = "rfc4106", | |
1215 | .create = crypto_rfc4106_create, | |
1216 | .module = THIS_MODULE, | |
1217 | }, { | |
1218 | .name = "rfc4543", | |
1219 | .create = crypto_rfc4543_create, | |
1220 | .module = THIS_MODULE, | |
1221 | }, | |
73c89c15 TB |
1222 | }; |
1223 | ||
28db8e3e MH |
1224 | static int __init crypto_gcm_module_init(void) |
1225 | { | |
d00aa19b HX |
1226 | int err; |
1227 | ||
adcbc688 | 1228 | gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL); |
9382d97a HY |
1229 | if (!gcm_zeroes) |
1230 | return -ENOMEM; | |
1231 | ||
adcbc688 HX |
1232 | sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf)); |
1233 | ||
56a00d9d XW |
1234 | err = crypto_register_templates(crypto_gcm_tmpls, |
1235 | ARRAY_SIZE(crypto_gcm_tmpls)); | |
d00aa19b | 1236 | if (err) |
56a00d9d | 1237 | kfree(gcm_zeroes); |
d00aa19b | 1238 | |
9382d97a | 1239 | return err; |
28db8e3e MH |
1240 | } |
1241 | ||
1242 | static void __exit crypto_gcm_module_exit(void) | |
1243 | { | |
9382d97a | 1244 | kfree(gcm_zeroes); |
56a00d9d XW |
1245 | crypto_unregister_templates(crypto_gcm_tmpls, |
1246 | ARRAY_SIZE(crypto_gcm_tmpls)); | |
28db8e3e MH |
1247 | } |
1248 | ||
c4741b23 | 1249 | subsys_initcall(crypto_gcm_module_init); |
28db8e3e MH |
1250 | module_exit(crypto_gcm_module_exit); |
1251 | ||
1252 | MODULE_LICENSE("GPL"); | |
1253 | MODULE_DESCRIPTION("Galois/Counter Mode"); | |
1254 | MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>"); | |
5d26a105 KC |
1255 | MODULE_ALIAS_CRYPTO("gcm_base"); |
1256 | MODULE_ALIAS_CRYPTO("rfc4106"); | |
1257 | MODULE_ALIAS_CRYPTO("rfc4543"); | |
4943ba16 | 1258 | MODULE_ALIAS_CRYPTO("gcm"); |