Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
28db8e3e MH |
2 | /* |
3 | * GCM: Galois/Counter Mode. | |
4 | * | |
5 | * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi> | |
28db8e3e MH |
6 | */ |
7 | ||
28db8e3e | 8 | #include <crypto/gf128mul.h> |
dadbc53d | 9 | #include <crypto/internal/aead.h> |
1472e5eb | 10 | #include <crypto/internal/skcipher.h> |
9382d97a | 11 | #include <crypto/internal/hash.h> |
17db8546 | 12 | #include <crypto/null.h> |
42c271c6 | 13 | #include <crypto/scatterwalk.h> |
e0ab7e9c | 14 | #include <crypto/gcm.h> |
9382d97a | 15 | #include <crypto/hash.h> |
28db8e3e MH |
16 | #include <linux/err.h> |
17 | #include <linux/init.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/slab.h> | |
21 | ||
28db8e3e | 22 | struct gcm_instance_ctx { |
1472e5eb | 23 | struct crypto_skcipher_spawn ctr; |
9382d97a | 24 | struct crypto_ahash_spawn ghash; |
28db8e3e MH |
25 | }; |
26 | ||
27 | struct crypto_gcm_ctx { | |
16f37ecd | 28 | struct crypto_skcipher *ctr; |
9382d97a | 29 | struct crypto_ahash *ghash; |
28db8e3e MH |
30 | }; |
31 | ||
dadbc53d HX |
32 | struct crypto_rfc4106_ctx { |
33 | struct crypto_aead *child; | |
34 | u8 nonce[4]; | |
35 | }; | |
36 | ||
7b05a373 HX |
37 | struct crypto_rfc4106_req_ctx { |
38 | struct scatterlist src[3]; | |
39 | struct scatterlist dst[3]; | |
40 | struct aead_request subreq; | |
41 | }; | |
42 | ||
9489667d JK |
43 | struct crypto_rfc4543_instance_ctx { |
44 | struct crypto_aead_spawn aead; | |
9489667d JK |
45 | }; |
46 | ||
73c89c15 TB |
47 | struct crypto_rfc4543_ctx { |
48 | struct crypto_aead *child; | |
8d605398 | 49 | struct crypto_sync_skcipher *null; |
73c89c15 TB |
50 | u8 nonce[4]; |
51 | }; | |
52 | ||
53 | struct crypto_rfc4543_req_ctx { | |
73c89c15 TB |
54 | struct aead_request subreq; |
55 | }; | |
56 | ||
28db8e3e | 57 | struct crypto_gcm_ghash_ctx { |
9382d97a HY |
58 | unsigned int cryptlen; |
59 | struct scatterlist *src; | |
adcbc688 | 60 | int (*complete)(struct aead_request *req, u32 flags); |
28db8e3e MH |
61 | }; |
62 | ||
63 | struct crypto_gcm_req_priv_ctx { | |
adcbc688 | 64 | u8 iv[16]; |
28db8e3e | 65 | u8 auth_tag[16]; |
6160b289 | 66 | u8 iauth_tag[16]; |
adcbc688 HX |
67 | struct scatterlist src[3]; |
68 | struct scatterlist dst[3]; | |
69 | struct scatterlist sg; | |
9382d97a HY |
70 | struct crypto_gcm_ghash_ctx ghash_ctx; |
71 | union { | |
72 | struct ahash_request ahreq; | |
16f37ecd | 73 | struct skcipher_request skreq; |
9382d97a | 74 | } u; |
28db8e3e MH |
75 | }; |
76 | ||
adcbc688 HX |
77 | static struct { |
78 | u8 buf[16]; | |
79 | struct scatterlist sg; | |
80 | } *gcm_zeroes; | |
81 | ||
82 | static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc); | |
9382d97a | 83 | |
2589469d HX |
84 | static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx( |
85 | struct aead_request *req) | |
86 | { | |
87 | unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); | |
88 | ||
89 | return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); | |
90 | } | |
91 | ||
28db8e3e MH |
92 | static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key, |
93 | unsigned int keylen) | |
94 | { | |
95 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); | |
9382d97a | 96 | struct crypto_ahash *ghash = ctx->ghash; |
16f37ecd | 97 | struct crypto_skcipher *ctr = ctx->ctr; |
84c91152 HX |
98 | struct { |
99 | be128 hash; | |
50d2e6dc | 100 | u8 iv[16]; |
84c91152 | 101 | |
76c67394 | 102 | struct crypto_wait wait; |
84c91152 HX |
103 | |
104 | struct scatterlist sg[1]; | |
16f37ecd | 105 | struct skcipher_request req; |
84c91152 HX |
106 | } *data; |
107 | int err; | |
28db8e3e | 108 | |
16f37ecd HX |
109 | crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK); |
110 | crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) & | |
111 | CRYPTO_TFM_REQ_MASK); | |
112 | err = crypto_skcipher_setkey(ctr, key, keylen); | |
28db8e3e | 113 | if (err) |
84c91152 | 114 | return err; |
28db8e3e | 115 | |
16f37ecd | 116 | data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr), |
84c91152 HX |
117 | GFP_KERNEL); |
118 | if (!data) | |
119 | return -ENOMEM; | |
120 | ||
76c67394 | 121 | crypto_init_wait(&data->wait); |
84c91152 | 122 | sg_init_one(data->sg, &data->hash, sizeof(data->hash)); |
16f37ecd HX |
123 | skcipher_request_set_tfm(&data->req, ctr); |
124 | skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP | | |
125 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
76c67394 GBY |
126 | crypto_req_done, |
127 | &data->wait); | |
16f37ecd HX |
128 | skcipher_request_set_crypt(&data->req, data->sg, data->sg, |
129 | sizeof(data->hash), data->iv); | |
130 | ||
76c67394 GBY |
131 | err = crypto_wait_req(crypto_skcipher_encrypt(&data->req), |
132 | &data->wait); | |
84c91152 | 133 | |
28db8e3e MH |
134 | if (err) |
135 | goto out; | |
136 | ||
9382d97a HY |
137 | crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK); |
138 | crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) & | |
139 | CRYPTO_TFM_REQ_MASK); | |
140 | err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128)); | |
84c91152 | 141 | out: |
adcbc688 | 142 | kzfree(data); |
28db8e3e MH |
143 | return err; |
144 | } | |
145 | ||
dadbc53d HX |
146 | static int crypto_gcm_setauthsize(struct crypto_aead *tfm, |
147 | unsigned int authsize) | |
148 | { | |
65526f63 | 149 | return crypto_gcm_check_authsize(authsize); |
dadbc53d HX |
150 | } |
151 | ||
adcbc688 | 152 | static void crypto_gcm_init_common(struct aead_request *req) |
28db8e3e | 153 | { |
2589469d | 154 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
84c91152 | 155 | __be32 counter = cpu_to_be32(1); |
adcbc688 | 156 | struct scatterlist *sg; |
84c91152 HX |
157 | |
158 | memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag)); | |
e0ab7e9c CL |
159 | memcpy(pctx->iv, req->iv, GCM_AES_IV_SIZE); |
160 | memcpy(pctx->iv + GCM_AES_IV_SIZE, &counter, 4); | |
84c91152 | 161 | |
adcbc688 | 162 | sg_init_table(pctx->src, 3); |
84c91152 | 163 | sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag)); |
adcbc688 HX |
164 | sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen); |
165 | if (sg != pctx->src + 1) | |
c56f6d12 | 166 | sg_chain(pctx->src, 2, sg); |
84c91152 | 167 | |
84c91152 | 168 | if (req->src != req->dst) { |
adcbc688 | 169 | sg_init_table(pctx->dst, 3); |
84c91152 | 170 | sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag)); |
adcbc688 HX |
171 | sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen); |
172 | if (sg != pctx->dst + 1) | |
c56f6d12 | 173 | sg_chain(pctx->dst, 2, sg); |
84c91152 | 174 | } |
adcbc688 HX |
175 | } |
176 | ||
177 | static void crypto_gcm_init_crypt(struct aead_request *req, | |
178 | unsigned int cryptlen) | |
179 | { | |
180 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
181 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); | |
182 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); | |
16f37ecd | 183 | struct skcipher_request *skreq = &pctx->u.skreq; |
adcbc688 HX |
184 | struct scatterlist *dst; |
185 | ||
186 | dst = req->src == req->dst ? pctx->src : pctx->dst; | |
28db8e3e | 187 | |
16f37ecd HX |
188 | skcipher_request_set_tfm(skreq, ctx->ctr); |
189 | skcipher_request_set_crypt(skreq, pctx->src, dst, | |
84c91152 | 190 | cryptlen + sizeof(pctx->auth_tag), |
adcbc688 | 191 | pctx->iv); |
9382d97a HY |
192 | } |
193 | ||
194 | static inline unsigned int gcm_remain(unsigned int len) | |
195 | { | |
196 | len &= 0xfU; | |
197 | return len ? 16 - len : 0; | |
198 | } | |
199 | ||
200 | static void gcm_hash_len_done(struct crypto_async_request *areq, int err); | |
28db8e3e | 201 | |
9382d97a | 202 | static int gcm_hash_update(struct aead_request *req, |
3e3dc25f | 203 | crypto_completion_t compl, |
9382d97a | 204 | struct scatterlist *src, |
adcbc688 | 205 | unsigned int len, u32 flags) |
9382d97a | 206 | { |
adcbc688 | 207 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a | 208 | struct ahash_request *ahreq = &pctx->u.ahreq; |
28db8e3e | 209 | |
adcbc688 | 210 | ahash_request_set_callback(ahreq, flags, compl, req); |
9382d97a HY |
211 | ahash_request_set_crypt(ahreq, src, NULL, len); |
212 | ||
213 | return crypto_ahash_update(ahreq); | |
28db8e3e MH |
214 | } |
215 | ||
9382d97a | 216 | static int gcm_hash_remain(struct aead_request *req, |
9382d97a | 217 | unsigned int remain, |
adcbc688 | 218 | crypto_completion_t compl, u32 flags) |
28db8e3e | 219 | { |
adcbc688 | 220 | return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags); |
9382d97a HY |
221 | } |
222 | ||
adcbc688 | 223 | static int gcm_hash_len(struct aead_request *req, u32 flags) |
9382d97a | 224 | { |
adcbc688 | 225 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
226 | struct ahash_request *ahreq = &pctx->u.ahreq; |
227 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
18666550 | 228 | be128 lengths; |
9382d97a HY |
229 | |
230 | lengths.a = cpu_to_be64(req->assoclen * 8); | |
231 | lengths.b = cpu_to_be64(gctx->cryptlen * 8); | |
232 | memcpy(pctx->iauth_tag, &lengths, 16); | |
adcbc688 HX |
233 | sg_init_one(&pctx->sg, pctx->iauth_tag, 16); |
234 | ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req); | |
235 | ahash_request_set_crypt(ahreq, &pctx->sg, | |
236 | pctx->iauth_tag, sizeof(lengths)); | |
9382d97a | 237 | |
adcbc688 | 238 | return crypto_ahash_finup(ahreq); |
9382d97a HY |
239 | } |
240 | ||
adcbc688 | 241 | static int gcm_hash_len_continue(struct aead_request *req, u32 flags) |
9382d97a | 242 | { |
2589469d | 243 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
244 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
245 | ||
adcbc688 | 246 | return gctx->complete(req, flags); |
9382d97a HY |
247 | } |
248 | ||
adcbc688 | 249 | static void gcm_hash_len_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
250 | { |
251 | struct aead_request *req = areq->data; | |
62c5593a | 252 | |
adcbc688 HX |
253 | if (err) |
254 | goto out; | |
9382d97a | 255 | |
adcbc688 HX |
256 | err = gcm_hash_len_continue(req, 0); |
257 | if (err == -EINPROGRESS) | |
258 | return; | |
62c5593a | 259 | |
adcbc688 HX |
260 | out: |
261 | aead_request_complete(req, err); | |
62c5593a HY |
262 | } |
263 | ||
adcbc688 | 264 | static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags) |
62c5593a | 265 | { |
adcbc688 HX |
266 | return gcm_hash_len(req, flags) ?: |
267 | gcm_hash_len_continue(req, flags); | |
9382d97a HY |
268 | } |
269 | ||
62c5593a HY |
270 | static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq, |
271 | int err) | |
9382d97a HY |
272 | { |
273 | struct aead_request *req = areq->data; | |
62c5593a | 274 | |
adcbc688 HX |
275 | if (err) |
276 | goto out; | |
277 | ||
278 | err = gcm_hash_crypt_remain_continue(req, 0); | |
279 | if (err == -EINPROGRESS) | |
280 | return; | |
281 | ||
282 | out: | |
283 | aead_request_complete(req, err); | |
62c5593a HY |
284 | } |
285 | ||
adcbc688 | 286 | static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags) |
62c5593a | 287 | { |
9382d97a HY |
288 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
289 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
290 | unsigned int remain; | |
291 | ||
adcbc688 HX |
292 | remain = gcm_remain(gctx->cryptlen); |
293 | if (remain) | |
294 | return gcm_hash_remain(req, remain, | |
295 | gcm_hash_crypt_remain_done, flags) ?: | |
296 | gcm_hash_crypt_remain_continue(req, flags); | |
9382d97a | 297 | |
adcbc688 | 298 | return gcm_hash_crypt_remain_continue(req, flags); |
9382d97a HY |
299 | } |
300 | ||
62c5593a | 301 | static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
302 | { |
303 | struct aead_request *req = areq->data; | |
62c5593a | 304 | |
adcbc688 HX |
305 | if (err) |
306 | goto out; | |
307 | ||
308 | err = gcm_hash_crypt_continue(req, 0); | |
309 | if (err == -EINPROGRESS) | |
310 | return; | |
311 | ||
312 | out: | |
313 | aead_request_complete(req, err); | |
62c5593a HY |
314 | } |
315 | ||
adcbc688 | 316 | static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags) |
62c5593a | 317 | { |
9382d97a HY |
318 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
319 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
9382d97a | 320 | |
adcbc688 HX |
321 | if (gctx->cryptlen) |
322 | return gcm_hash_update(req, gcm_hash_crypt_done, | |
323 | gctx->src, gctx->cryptlen, flags) ?: | |
324 | gcm_hash_crypt_continue(req, flags); | |
325 | ||
326 | return gcm_hash_crypt_remain_continue(req, flags); | |
9382d97a HY |
327 | } |
328 | ||
62c5593a HY |
329 | static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq, |
330 | int err) | |
9382d97a HY |
331 | { |
332 | struct aead_request *req = areq->data; | |
62c5593a | 333 | |
adcbc688 HX |
334 | if (err) |
335 | goto out; | |
336 | ||
337 | err = gcm_hash_assoc_remain_continue(req, 0); | |
338 | if (err == -EINPROGRESS) | |
339 | return; | |
340 | ||
341 | out: | |
342 | aead_request_complete(req, err); | |
62c5593a HY |
343 | } |
344 | ||
adcbc688 | 345 | static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags) |
62c5593a | 346 | { |
9382d97a HY |
347 | unsigned int remain; |
348 | ||
adcbc688 HX |
349 | remain = gcm_remain(req->assoclen); |
350 | if (remain) | |
351 | return gcm_hash_remain(req, remain, | |
352 | gcm_hash_assoc_remain_done, flags) ?: | |
353 | gcm_hash_assoc_remain_continue(req, flags); | |
9382d97a | 354 | |
adcbc688 | 355 | return gcm_hash_assoc_remain_continue(req, flags); |
9382d97a HY |
356 | } |
357 | ||
62c5593a | 358 | static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
359 | { |
360 | struct aead_request *req = areq->data; | |
62c5593a | 361 | |
adcbc688 HX |
362 | if (err) |
363 | goto out; | |
364 | ||
365 | err = gcm_hash_assoc_continue(req, 0); | |
366 | if (err == -EINPROGRESS) | |
367 | return; | |
368 | ||
369 | out: | |
370 | aead_request_complete(req, err); | |
62c5593a HY |
371 | } |
372 | ||
adcbc688 | 373 | static int gcm_hash_init_continue(struct aead_request *req, u32 flags) |
62c5593a | 374 | { |
adcbc688 HX |
375 | if (req->assoclen) |
376 | return gcm_hash_update(req, gcm_hash_assoc_done, | |
377 | req->src, req->assoclen, flags) ?: | |
378 | gcm_hash_assoc_continue(req, flags); | |
9382d97a | 379 | |
adcbc688 | 380 | return gcm_hash_assoc_remain_continue(req, flags); |
62c5593a HY |
381 | } |
382 | ||
383 | static void gcm_hash_init_done(struct crypto_async_request *areq, int err) | |
384 | { | |
385 | struct aead_request *req = areq->data; | |
386 | ||
adcbc688 HX |
387 | if (err) |
388 | goto out; | |
389 | ||
390 | err = gcm_hash_init_continue(req, 0); | |
391 | if (err == -EINPROGRESS) | |
392 | return; | |
393 | ||
394 | out: | |
395 | aead_request_complete(req, err); | |
9382d97a HY |
396 | } |
397 | ||
adcbc688 | 398 | static int gcm_hash(struct aead_request *req, u32 flags) |
9382d97a | 399 | { |
adcbc688 | 400 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a | 401 | struct ahash_request *ahreq = &pctx->u.ahreq; |
adcbc688 | 402 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
9382d97a HY |
403 | |
404 | ahash_request_set_tfm(ahreq, ctx->ghash); | |
405 | ||
adcbc688 HX |
406 | ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req); |
407 | return crypto_ahash_init(ahreq) ?: | |
408 | gcm_hash_init_continue(req, flags); | |
9382d97a HY |
409 | } |
410 | ||
adcbc688 | 411 | static int gcm_enc_copy_hash(struct aead_request *req, u32 flags) |
9382d97a | 412 | { |
adcbc688 | 413 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
414 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
415 | u8 *auth_tag = pctx->auth_tag; | |
28db8e3e | 416 | |
adcbc688 HX |
417 | crypto_xor(auth_tag, pctx->iauth_tag, 16); |
418 | scatterwalk_map_and_copy(auth_tag, req->dst, | |
419 | req->assoclen + req->cryptlen, | |
6160b289 | 420 | crypto_aead_authsize(aead), 1); |
adcbc688 | 421 | return 0; |
6160b289 HX |
422 | } |
423 | ||
adcbc688 | 424 | static int gcm_encrypt_continue(struct aead_request *req, u32 flags) |
6160b289 | 425 | { |
9382d97a | 426 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
adcbc688 | 427 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
6160b289 | 428 | |
adcbc688 HX |
429 | gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst); |
430 | gctx->cryptlen = req->cryptlen; | |
431 | gctx->complete = gcm_enc_copy_hash; | |
6160b289 | 432 | |
adcbc688 | 433 | return gcm_hash(req, flags); |
28db8e3e MH |
434 | } |
435 | ||
62c5593a | 436 | static void gcm_encrypt_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
437 | { |
438 | struct aead_request *req = areq->data; | |
9382d97a | 439 | |
adcbc688 HX |
440 | if (err) |
441 | goto out; | |
442 | ||
443 | err = gcm_encrypt_continue(req, 0); | |
444 | if (err == -EINPROGRESS) | |
445 | return; | |
9382d97a | 446 | |
adcbc688 | 447 | out: |
62c5593a | 448 | aead_request_complete(req, err); |
9382d97a HY |
449 | } |
450 | ||
28db8e3e MH |
451 | static int crypto_gcm_encrypt(struct aead_request *req) |
452 | { | |
2589469d | 453 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
16f37ecd | 454 | struct skcipher_request *skreq = &pctx->u.skreq; |
adcbc688 | 455 | u32 flags = aead_request_flags(req); |
9382d97a | 456 | |
adcbc688 HX |
457 | crypto_gcm_init_common(req); |
458 | crypto_gcm_init_crypt(req, req->cryptlen); | |
16f37ecd | 459 | skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req); |
9382d97a | 460 | |
16f37ecd | 461 | return crypto_skcipher_encrypt(skreq) ?: |
adcbc688 | 462 | gcm_encrypt_continue(req, flags); |
28db8e3e MH |
463 | } |
464 | ||
adcbc688 | 465 | static int crypto_gcm_verify(struct aead_request *req) |
84c91152 | 466 | { |
adcbc688 | 467 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
84c91152 | 468 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
84c91152 HX |
469 | u8 *auth_tag = pctx->auth_tag; |
470 | u8 *iauth_tag = pctx->iauth_tag; | |
471 | unsigned int authsize = crypto_aead_authsize(aead); | |
472 | unsigned int cryptlen = req->cryptlen - authsize; | |
473 | ||
9382d97a | 474 | crypto_xor(auth_tag, iauth_tag, 16); |
adcbc688 HX |
475 | scatterwalk_map_and_copy(iauth_tag, req->src, |
476 | req->assoclen + cryptlen, authsize, 0); | |
6bf37e5a | 477 | return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0; |
84c91152 HX |
478 | } |
479 | ||
9382d97a | 480 | static void gcm_decrypt_done(struct crypto_async_request *areq, int err) |
28db8e3e | 481 | { |
84c91152 HX |
482 | struct aead_request *req = areq->data; |
483 | ||
484 | if (!err) | |
adcbc688 | 485 | err = crypto_gcm_verify(req); |
84c91152 HX |
486 | |
487 | aead_request_complete(req, err); | |
28db8e3e MH |
488 | } |
489 | ||
adcbc688 | 490 | static int gcm_dec_hash_continue(struct aead_request *req, u32 flags) |
9382d97a | 491 | { |
9382d97a | 492 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
16f37ecd | 493 | struct skcipher_request *skreq = &pctx->u.skreq; |
9382d97a HY |
494 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
495 | ||
adcbc688 | 496 | crypto_gcm_init_crypt(req, gctx->cryptlen); |
16f37ecd HX |
497 | skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req); |
498 | return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req); | |
9382d97a HY |
499 | } |
500 | ||
28db8e3e MH |
501 | static int crypto_gcm_decrypt(struct aead_request *req) |
502 | { | |
6160b289 | 503 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
2589469d | 504 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a | 505 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
6160b289 | 506 | unsigned int authsize = crypto_aead_authsize(aead); |
9382d97a | 507 | unsigned int cryptlen = req->cryptlen; |
adcbc688 | 508 | u32 flags = aead_request_flags(req); |
28db8e3e | 509 | |
6160b289 | 510 | cryptlen -= authsize; |
28db8e3e | 511 | |
adcbc688 | 512 | crypto_gcm_init_common(req); |
28db8e3e | 513 | |
adcbc688 HX |
514 | gctx->src = sg_next(pctx->src); |
515 | gctx->cryptlen = cryptlen; | |
516 | gctx->complete = gcm_dec_hash_continue; | |
28db8e3e | 517 | |
adcbc688 | 518 | return gcm_hash(req, flags); |
28db8e3e MH |
519 | } |
520 | ||
adcbc688 | 521 | static int crypto_gcm_init_tfm(struct crypto_aead *tfm) |
28db8e3e | 522 | { |
adcbc688 HX |
523 | struct aead_instance *inst = aead_alg_instance(tfm); |
524 | struct gcm_instance_ctx *ictx = aead_instance_ctx(inst); | |
525 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm); | |
16f37ecd | 526 | struct crypto_skcipher *ctr; |
9382d97a | 527 | struct crypto_ahash *ghash; |
28db8e3e MH |
528 | unsigned long align; |
529 | int err; | |
530 | ||
9382d97a HY |
531 | ghash = crypto_spawn_ahash(&ictx->ghash); |
532 | if (IS_ERR(ghash)) | |
533 | return PTR_ERR(ghash); | |
534 | ||
60425a8b | 535 | ctr = crypto_spawn_skcipher(&ictx->ctr); |
28db8e3e MH |
536 | err = PTR_ERR(ctr); |
537 | if (IS_ERR(ctr)) | |
9382d97a | 538 | goto err_free_hash; |
28db8e3e MH |
539 | |
540 | ctx->ctr = ctr; | |
9382d97a | 541 | ctx->ghash = ghash; |
28db8e3e | 542 | |
adcbc688 | 543 | align = crypto_aead_alignmask(tfm); |
28db8e3e | 544 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
adcbc688 | 545 | crypto_aead_set_reqsize(tfm, |
5d72336f | 546 | align + offsetof(struct crypto_gcm_req_priv_ctx, u) + |
16f37ecd HX |
547 | max(sizeof(struct skcipher_request) + |
548 | crypto_skcipher_reqsize(ctr), | |
9382d97a | 549 | sizeof(struct ahash_request) + |
5d72336f | 550 | crypto_ahash_reqsize(ghash))); |
28db8e3e MH |
551 | |
552 | return 0; | |
9382d97a HY |
553 | |
554 | err_free_hash: | |
555 | crypto_free_ahash(ghash); | |
556 | return err; | |
28db8e3e MH |
557 | } |
558 | ||
adcbc688 | 559 | static void crypto_gcm_exit_tfm(struct crypto_aead *tfm) |
28db8e3e | 560 | { |
adcbc688 | 561 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm); |
28db8e3e | 562 | |
9382d97a | 563 | crypto_free_ahash(ctx->ghash); |
16f37ecd | 564 | crypto_free_skcipher(ctx->ctr); |
28db8e3e MH |
565 | } |
566 | ||
7b05a373 HX |
567 | static void crypto_gcm_free(struct aead_instance *inst) |
568 | { | |
569 | struct gcm_instance_ctx *ctx = aead_instance_ctx(inst); | |
570 | ||
571 | crypto_drop_skcipher(&ctx->ctr); | |
572 | crypto_drop_ahash(&ctx->ghash); | |
573 | kfree(inst); | |
574 | } | |
575 | ||
adcbc688 HX |
576 | static int crypto_gcm_create_common(struct crypto_template *tmpl, |
577 | struct rtattr **tb, | |
adcbc688 HX |
578 | const char *ctr_name, |
579 | const char *ghash_name) | |
28db8e3e | 580 | { |
d00aa19b | 581 | struct crypto_attr_type *algt; |
b9f76ddd | 582 | u32 mask; |
adcbc688 | 583 | struct aead_instance *inst; |
ab6ffd36 | 584 | struct gcm_instance_ctx *ctx; |
16f37ecd | 585 | struct skcipher_alg *ctr; |
adcbc688 | 586 | struct hash_alg_common *ghash; |
28db8e3e | 587 | int err; |
28db8e3e | 588 | |
d00aa19b | 589 | algt = crypto_get_attr_type(tb); |
d00aa19b | 590 | if (IS_ERR(algt)) |
adcbc688 | 591 | return PTR_ERR(algt); |
28db8e3e | 592 | |
5e4b8c1f | 593 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
adcbc688 | 594 | return -EINVAL; |
28db8e3e | 595 | |
b9f76ddd EB |
596 | mask = crypto_requires_sync(algt->type, algt->mask); |
597 | ||
1472e5eb HX |
598 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
599 | if (!inst) | |
ab6ffd36 | 600 | return -ENOMEM; |
adcbc688 | 601 | ctx = aead_instance_ctx(inst); |
ab6ffd36 EB |
602 | |
603 | err = crypto_grab_ahash(&ctx->ghash, aead_crypto_instance(inst), | |
604 | ghash_name, 0, mask); | |
9382d97a HY |
605 | if (err) |
606 | goto err_free_inst; | |
ab6ffd36 | 607 | ghash = crypto_spawn_ahash_alg(&ctx->ghash); |
9382d97a | 608 | |
adcbc688 | 609 | err = -EINVAL; |
f699594d EB |
610 | if (strcmp(ghash->base.cra_name, "ghash") != 0 || |
611 | ghash->digestsize != 16) | |
ab6ffd36 | 612 | goto err_free_inst; |
adcbc688 | 613 | |
b9f76ddd EB |
614 | err = crypto_grab_skcipher(&ctx->ctr, aead_crypto_instance(inst), |
615 | ctr_name, 0, mask); | |
1472e5eb | 616 | if (err) |
ab6ffd36 | 617 | goto err_free_inst; |
16f37ecd | 618 | ctr = crypto_spawn_skcipher_alg(&ctx->ctr); |
28db8e3e | 619 | |
f699594d | 620 | /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */ |
9b40f79c | 621 | err = -EINVAL; |
f699594d EB |
622 | if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 || |
623 | crypto_skcipher_alg_ivsize(ctr) != 16 || | |
624 | ctr->base.cra_blocksize != 1) | |
ab6ffd36 | 625 | goto err_free_inst; |
d00aa19b | 626 | |
f699594d EB |
627 | err = -ENAMETOOLONG; |
628 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, | |
629 | "gcm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME) | |
ab6ffd36 | 630 | goto err_free_inst; |
28db8e3e | 631 | |
adcbc688 | 632 | if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
16f37ecd | 633 | "gcm_base(%s,%s)", ctr->base.cra_driver_name, |
ab6ffd36 | 634 | ghash->base.cra_driver_name) >= |
d00aa19b | 635 | CRYPTO_MAX_ALG_NAME) |
ab6ffd36 | 636 | goto err_free_inst; |
28db8e3e | 637 | |
16f37ecd HX |
638 | inst->alg.base.cra_flags = (ghash->base.cra_flags | |
639 | ctr->base.cra_flags) & CRYPTO_ALG_ASYNC; | |
adcbc688 | 640 | inst->alg.base.cra_priority = (ghash->base.cra_priority + |
16f37ecd | 641 | ctr->base.cra_priority) / 2; |
adcbc688 HX |
642 | inst->alg.base.cra_blocksize = 1; |
643 | inst->alg.base.cra_alignmask = ghash->base.cra_alignmask | | |
16f37ecd | 644 | ctr->base.cra_alignmask; |
adcbc688 | 645 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx); |
e0ab7e9c | 646 | inst->alg.ivsize = GCM_AES_IV_SIZE; |
16f37ecd | 647 | inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr); |
adcbc688 HX |
648 | inst->alg.maxauthsize = 16; |
649 | inst->alg.init = crypto_gcm_init_tfm; | |
650 | inst->alg.exit = crypto_gcm_exit_tfm; | |
651 | inst->alg.setkey = crypto_gcm_setkey; | |
652 | inst->alg.setauthsize = crypto_gcm_setauthsize; | |
653 | inst->alg.encrypt = crypto_gcm_encrypt; | |
654 | inst->alg.decrypt = crypto_gcm_decrypt; | |
655 | ||
7b05a373 HX |
656 | inst->free = crypto_gcm_free; |
657 | ||
adcbc688 | 658 | err = aead_register_instance(tmpl, inst); |
ab6ffd36 | 659 | if (err) { |
28db8e3e | 660 | err_free_inst: |
ab6ffd36 EB |
661 | crypto_gcm_free(inst); |
662 | } | |
663 | return err; | |
28db8e3e MH |
664 | } |
665 | ||
adcbc688 | 666 | static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb) |
d00aa19b | 667 | { |
d00aa19b HX |
668 | const char *cipher_name; |
669 | char ctr_name[CRYPTO_MAX_ALG_NAME]; | |
d00aa19b HX |
670 | |
671 | cipher_name = crypto_attr_alg_name(tb[1]); | |
d00aa19b | 672 | if (IS_ERR(cipher_name)) |
adcbc688 | 673 | return PTR_ERR(cipher_name); |
d00aa19b HX |
674 | |
675 | if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >= | |
676 | CRYPTO_MAX_ALG_NAME) | |
adcbc688 | 677 | return -ENAMETOOLONG; |
d00aa19b | 678 | |
f699594d | 679 | return crypto_gcm_create_common(tmpl, tb, ctr_name, "ghash"); |
d00aa19b HX |
680 | } |
681 | ||
adcbc688 HX |
682 | static int crypto_gcm_base_create(struct crypto_template *tmpl, |
683 | struct rtattr **tb) | |
d00aa19b | 684 | { |
d00aa19b | 685 | const char *ctr_name; |
9382d97a | 686 | const char *ghash_name; |
d00aa19b HX |
687 | |
688 | ctr_name = crypto_attr_alg_name(tb[1]); | |
d00aa19b | 689 | if (IS_ERR(ctr_name)) |
adcbc688 | 690 | return PTR_ERR(ctr_name); |
d00aa19b | 691 | |
9382d97a | 692 | ghash_name = crypto_attr_alg_name(tb[2]); |
9382d97a | 693 | if (IS_ERR(ghash_name)) |
adcbc688 | 694 | return PTR_ERR(ghash_name); |
9382d97a | 695 | |
f699594d | 696 | return crypto_gcm_create_common(tmpl, tb, ctr_name, ghash_name); |
d00aa19b HX |
697 | } |
698 | ||
dadbc53d HX |
699 | static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key, |
700 | unsigned int keylen) | |
701 | { | |
702 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); | |
703 | struct crypto_aead *child = ctx->child; | |
dadbc53d HX |
704 | |
705 | if (keylen < 4) | |
706 | return -EINVAL; | |
707 | ||
708 | keylen -= 4; | |
709 | memcpy(ctx->nonce, key + keylen, 4); | |
710 | ||
711 | crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
712 | crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & | |
713 | CRYPTO_TFM_REQ_MASK); | |
af5034e8 | 714 | return crypto_aead_setkey(child, key, keylen); |
dadbc53d HX |
715 | } |
716 | ||
717 | static int crypto_rfc4106_setauthsize(struct crypto_aead *parent, | |
718 | unsigned int authsize) | |
719 | { | |
720 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); | |
65526f63 | 721 | int err; |
dadbc53d | 722 | |
65526f63 IP |
723 | err = crypto_rfc4106_check_authsize(authsize); |
724 | if (err) | |
725 | return err; | |
dadbc53d HX |
726 | |
727 | return crypto_aead_setauthsize(ctx->child, authsize); | |
728 | } | |
729 | ||
730 | static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req) | |
731 | { | |
7b05a373 | 732 | struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req); |
dadbc53d HX |
733 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
734 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead); | |
7b05a373 | 735 | struct aead_request *subreq = &rctx->subreq; |
dadbc53d | 736 | struct crypto_aead *child = ctx->child; |
7b05a373 | 737 | struct scatterlist *sg; |
dadbc53d HX |
738 | u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child), |
739 | crypto_aead_alignmask(child) + 1); | |
740 | ||
e0ab7e9c | 741 | scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0); |
7b05a373 | 742 | |
dadbc53d HX |
743 | memcpy(iv, ctx->nonce, 4); |
744 | memcpy(iv + 4, req->iv, 8); | |
745 | ||
7b05a373 | 746 | sg_init_table(rctx->src, 3); |
e0ab7e9c | 747 | sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8); |
7b05a373 HX |
748 | sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen); |
749 | if (sg != rctx->src + 1) | |
750 | sg_chain(rctx->src, 2, sg); | |
751 | ||
752 | if (req->src != req->dst) { | |
753 | sg_init_table(rctx->dst, 3); | |
e0ab7e9c | 754 | sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8); |
7b05a373 HX |
755 | sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen); |
756 | if (sg != rctx->dst + 1) | |
757 | sg_chain(rctx->dst, 2, sg); | |
758 | } | |
759 | ||
dadbc53d HX |
760 | aead_request_set_tfm(subreq, child); |
761 | aead_request_set_callback(subreq, req->base.flags, req->base.complete, | |
762 | req->base.data); | |
7b05a373 HX |
763 | aead_request_set_crypt(subreq, rctx->src, |
764 | req->src == req->dst ? rctx->src : rctx->dst, | |
765 | req->cryptlen, iv); | |
766 | aead_request_set_ad(subreq, req->assoclen - 8); | |
dadbc53d HX |
767 | |
768 | return subreq; | |
769 | } | |
770 | ||
771 | static int crypto_rfc4106_encrypt(struct aead_request *req) | |
772 | { | |
65526f63 IP |
773 | int err; |
774 | ||
775 | err = crypto_ipsec_check_assoclen(req->assoclen); | |
776 | if (err) | |
777 | return err; | |
7b05a373 | 778 | |
dadbc53d HX |
779 | req = crypto_rfc4106_crypt(req); |
780 | ||
781 | return crypto_aead_encrypt(req); | |
782 | } | |
783 | ||
784 | static int crypto_rfc4106_decrypt(struct aead_request *req) | |
785 | { | |
65526f63 IP |
786 | int err; |
787 | ||
788 | err = crypto_ipsec_check_assoclen(req->assoclen); | |
789 | if (err) | |
790 | return err; | |
7b05a373 | 791 | |
dadbc53d HX |
792 | req = crypto_rfc4106_crypt(req); |
793 | ||
794 | return crypto_aead_decrypt(req); | |
795 | } | |
796 | ||
adcbc688 | 797 | static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm) |
dadbc53d | 798 | { |
adcbc688 HX |
799 | struct aead_instance *inst = aead_alg_instance(tfm); |
800 | struct crypto_aead_spawn *spawn = aead_instance_ctx(inst); | |
801 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm); | |
dadbc53d HX |
802 | struct crypto_aead *aead; |
803 | unsigned long align; | |
804 | ||
805 | aead = crypto_spawn_aead(spawn); | |
806 | if (IS_ERR(aead)) | |
807 | return PTR_ERR(aead); | |
808 | ||
809 | ctx->child = aead; | |
810 | ||
811 | align = crypto_aead_alignmask(aead); | |
812 | align &= ~(crypto_tfm_ctx_alignment() - 1); | |
adcbc688 HX |
813 | crypto_aead_set_reqsize( |
814 | tfm, | |
7b05a373 | 815 | sizeof(struct crypto_rfc4106_req_ctx) + |
5d72336f | 816 | ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + |
7b05a373 | 817 | align + 24); |
dadbc53d HX |
818 | |
819 | return 0; | |
820 | } | |
821 | ||
adcbc688 | 822 | static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm) |
dadbc53d | 823 | { |
adcbc688 | 824 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm); |
dadbc53d HX |
825 | |
826 | crypto_free_aead(ctx->child); | |
827 | } | |
828 | ||
7b05a373 HX |
829 | static void crypto_rfc4106_free(struct aead_instance *inst) |
830 | { | |
831 | crypto_drop_aead(aead_instance_ctx(inst)); | |
832 | kfree(inst); | |
833 | } | |
834 | ||
adcbc688 HX |
835 | static int crypto_rfc4106_create(struct crypto_template *tmpl, |
836 | struct rtattr **tb) | |
dadbc53d HX |
837 | { |
838 | struct crypto_attr_type *algt; | |
cd900f0c | 839 | u32 mask; |
adcbc688 | 840 | struct aead_instance *inst; |
dadbc53d | 841 | struct crypto_aead_spawn *spawn; |
adcbc688 | 842 | struct aead_alg *alg; |
dadbc53d HX |
843 | int err; |
844 | ||
845 | algt = crypto_get_attr_type(tb); | |
dadbc53d | 846 | if (IS_ERR(algt)) |
adcbc688 | 847 | return PTR_ERR(algt); |
dadbc53d | 848 | |
5e4b8c1f | 849 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
adcbc688 | 850 | return -EINVAL; |
dadbc53d | 851 | |
cd900f0c EB |
852 | mask = crypto_requires_sync(algt->type, algt->mask); |
853 | ||
dadbc53d HX |
854 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); |
855 | if (!inst) | |
adcbc688 | 856 | return -ENOMEM; |
dadbc53d | 857 | |
adcbc688 | 858 | spawn = aead_instance_ctx(inst); |
cd900f0c | 859 | err = crypto_grab_aead(spawn, aead_crypto_instance(inst), |
959ac1cd | 860 | crypto_attr_alg_name(tb[1]), 0, mask); |
dadbc53d | 861 | if (err) |
959ac1cd | 862 | goto err_free_inst; |
dadbc53d | 863 | |
adcbc688 | 864 | alg = crypto_spawn_aead_alg(spawn); |
dadbc53d HX |
865 | |
866 | err = -EINVAL; | |
867 | ||
adcbc688 | 868 | /* Underlying IV size must be 12. */ |
e0ab7e9c | 869 | if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE) |
959ac1cd | 870 | goto err_free_inst; |
dadbc53d HX |
871 | |
872 | /* Not a stream cipher? */ | |
adcbc688 | 873 | if (alg->base.cra_blocksize != 1) |
959ac1cd | 874 | goto err_free_inst; |
dadbc53d HX |
875 | |
876 | err = -ENAMETOOLONG; | |
adcbc688 HX |
877 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
878 | "rfc4106(%s)", alg->base.cra_name) >= | |
879 | CRYPTO_MAX_ALG_NAME || | |
880 | snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
881 | "rfc4106(%s)", alg->base.cra_driver_name) >= | |
dadbc53d | 882 | CRYPTO_MAX_ALG_NAME) |
959ac1cd | 883 | goto err_free_inst; |
dadbc53d | 884 | |
7b05a373 | 885 | inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
adcbc688 HX |
886 | inst->alg.base.cra_priority = alg->base.cra_priority; |
887 | inst->alg.base.cra_blocksize = 1; | |
888 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask; | |
dadbc53d | 889 | |
adcbc688 | 890 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx); |
dadbc53d | 891 | |
e0ab7e9c | 892 | inst->alg.ivsize = GCM_RFC4106_IV_SIZE; |
16f37ecd | 893 | inst->alg.chunksize = crypto_aead_alg_chunksize(alg); |
adcbc688 | 894 | inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); |
dadbc53d | 895 | |
adcbc688 HX |
896 | inst->alg.init = crypto_rfc4106_init_tfm; |
897 | inst->alg.exit = crypto_rfc4106_exit_tfm; | |
dadbc53d | 898 | |
adcbc688 HX |
899 | inst->alg.setkey = crypto_rfc4106_setkey; |
900 | inst->alg.setauthsize = crypto_rfc4106_setauthsize; | |
901 | inst->alg.encrypt = crypto_rfc4106_encrypt; | |
902 | inst->alg.decrypt = crypto_rfc4106_decrypt; | |
dadbc53d | 903 | |
7b05a373 HX |
904 | inst->free = crypto_rfc4106_free; |
905 | ||
adcbc688 | 906 | err = aead_register_instance(tmpl, inst); |
959ac1cd EB |
907 | if (err) { |
908 | err_free_inst: | |
909 | crypto_rfc4106_free(inst); | |
910 | } | |
adcbc688 | 911 | return err; |
dadbc53d HX |
912 | } |
913 | ||
73c89c15 TB |
914 | static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key, |
915 | unsigned int keylen) | |
916 | { | |
917 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent); | |
918 | struct crypto_aead *child = ctx->child; | |
73c89c15 TB |
919 | |
920 | if (keylen < 4) | |
921 | return -EINVAL; | |
922 | ||
923 | keylen -= 4; | |
924 | memcpy(ctx->nonce, key + keylen, 4); | |
925 | ||
926 | crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
927 | crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & | |
928 | CRYPTO_TFM_REQ_MASK); | |
af5034e8 | 929 | return crypto_aead_setkey(child, key, keylen); |
73c89c15 TB |
930 | } |
931 | ||
932 | static int crypto_rfc4543_setauthsize(struct crypto_aead *parent, | |
933 | unsigned int authsize) | |
934 | { | |
935 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent); | |
936 | ||
937 | if (authsize != 16) | |
938 | return -EINVAL; | |
939 | ||
940 | return crypto_aead_setauthsize(ctx->child, authsize); | |
941 | } | |
942 | ||
adcbc688 | 943 | static int crypto_rfc4543_crypt(struct aead_request *req, bool enc) |
73c89c15 TB |
944 | { |
945 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
946 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead); | |
adcbc688 | 947 | struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req); |
73c89c15 | 948 | struct aead_request *subreq = &rctx->subreq; |
73c89c15 | 949 | unsigned int authsize = crypto_aead_authsize(aead); |
73c89c15 TB |
950 | u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child), |
951 | crypto_aead_alignmask(ctx->child) + 1); | |
adcbc688 HX |
952 | int err; |
953 | ||
954 | if (req->src != req->dst) { | |
955 | err = crypto_rfc4543_copy_src_to_dst(req, enc); | |
956 | if (err) | |
957 | return err; | |
958 | } | |
73c89c15 TB |
959 | |
960 | memcpy(iv, ctx->nonce, 4); | |
961 | memcpy(iv + 4, req->iv, 8); | |
962 | ||
73c89c15 | 963 | aead_request_set_tfm(subreq, ctx->child); |
adcbc688 HX |
964 | aead_request_set_callback(subreq, req->base.flags, |
965 | req->base.complete, req->base.data); | |
966 | aead_request_set_crypt(subreq, req->src, req->dst, | |
967 | enc ? 0 : authsize, iv); | |
968 | aead_request_set_ad(subreq, req->assoclen + req->cryptlen - | |
969 | subreq->cryptlen); | |
970 | ||
971 | return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq); | |
73c89c15 TB |
972 | } |
973 | ||
9489667d JK |
974 | static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc) |
975 | { | |
976 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
977 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead); | |
978 | unsigned int authsize = crypto_aead_authsize(aead); | |
adcbc688 HX |
979 | unsigned int nbytes = req->assoclen + req->cryptlen - |
980 | (enc ? 0 : authsize); | |
8d605398 | 981 | SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null); |
16f37ecd | 982 | |
8d605398 | 983 | skcipher_request_set_sync_tfm(nreq, ctx->null); |
16f37ecd HX |
984 | skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL); |
985 | skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL); | |
9489667d | 986 | |
16f37ecd | 987 | return crypto_skcipher_encrypt(nreq); |
9489667d JK |
988 | } |
989 | ||
73c89c15 TB |
990 | static int crypto_rfc4543_encrypt(struct aead_request *req) |
991 | { | |
74bf81d0 IP |
992 | return crypto_ipsec_check_assoclen(req->assoclen) ?: |
993 | crypto_rfc4543_crypt(req, true); | |
73c89c15 TB |
994 | } |
995 | ||
996 | static int crypto_rfc4543_decrypt(struct aead_request *req) | |
997 | { | |
74bf81d0 IP |
998 | return crypto_ipsec_check_assoclen(req->assoclen) ?: |
999 | crypto_rfc4543_crypt(req, false); | |
73c89c15 TB |
1000 | } |
1001 | ||
adcbc688 | 1002 | static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm) |
73c89c15 | 1003 | { |
adcbc688 HX |
1004 | struct aead_instance *inst = aead_alg_instance(tfm); |
1005 | struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst); | |
9489667d | 1006 | struct crypto_aead_spawn *spawn = &ictx->aead; |
adcbc688 | 1007 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm); |
73c89c15 | 1008 | struct crypto_aead *aead; |
8d605398 | 1009 | struct crypto_sync_skcipher *null; |
73c89c15 | 1010 | unsigned long align; |
9489667d | 1011 | int err = 0; |
73c89c15 TB |
1012 | |
1013 | aead = crypto_spawn_aead(spawn); | |
1014 | if (IS_ERR(aead)) | |
1015 | return PTR_ERR(aead); | |
1016 | ||
3a2d4fb5 | 1017 | null = crypto_get_default_null_skcipher(); |
9489667d JK |
1018 | err = PTR_ERR(null); |
1019 | if (IS_ERR(null)) | |
1020 | goto err_free_aead; | |
1021 | ||
73c89c15 | 1022 | ctx->child = aead; |
9489667d | 1023 | ctx->null = null; |
73c89c15 TB |
1024 | |
1025 | align = crypto_aead_alignmask(aead); | |
1026 | align &= ~(crypto_tfm_ctx_alignment() - 1); | |
adcbc688 HX |
1027 | crypto_aead_set_reqsize( |
1028 | tfm, | |
5d72336f HX |
1029 | sizeof(struct crypto_rfc4543_req_ctx) + |
1030 | ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + | |
e0ab7e9c | 1031 | align + GCM_AES_IV_SIZE); |
73c89c15 TB |
1032 | |
1033 | return 0; | |
9489667d JK |
1034 | |
1035 | err_free_aead: | |
1036 | crypto_free_aead(aead); | |
1037 | return err; | |
73c89c15 TB |
1038 | } |
1039 | ||
adcbc688 | 1040 | static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm) |
73c89c15 | 1041 | { |
adcbc688 | 1042 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm); |
73c89c15 TB |
1043 | |
1044 | crypto_free_aead(ctx->child); | |
3a2d4fb5 | 1045 | crypto_put_default_null_skcipher(); |
73c89c15 TB |
1046 | } |
1047 | ||
7b05a373 HX |
1048 | static void crypto_rfc4543_free(struct aead_instance *inst) |
1049 | { | |
1050 | struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst); | |
1051 | ||
1052 | crypto_drop_aead(&ctx->aead); | |
1053 | ||
1054 | kfree(inst); | |
1055 | } | |
1056 | ||
adcbc688 HX |
1057 | static int crypto_rfc4543_create(struct crypto_template *tmpl, |
1058 | struct rtattr **tb) | |
73c89c15 TB |
1059 | { |
1060 | struct crypto_attr_type *algt; | |
cd900f0c | 1061 | u32 mask; |
adcbc688 | 1062 | struct aead_instance *inst; |
adcbc688 | 1063 | struct aead_alg *alg; |
9489667d | 1064 | struct crypto_rfc4543_instance_ctx *ctx; |
73c89c15 TB |
1065 | int err; |
1066 | ||
1067 | algt = crypto_get_attr_type(tb); | |
73c89c15 | 1068 | if (IS_ERR(algt)) |
adcbc688 | 1069 | return PTR_ERR(algt); |
73c89c15 | 1070 | |
5e4b8c1f | 1071 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
adcbc688 | 1072 | return -EINVAL; |
73c89c15 | 1073 | |
cd900f0c EB |
1074 | mask = crypto_requires_sync(algt->type, algt->mask); |
1075 | ||
9489667d | 1076 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
73c89c15 | 1077 | if (!inst) |
adcbc688 | 1078 | return -ENOMEM; |
73c89c15 | 1079 | |
adcbc688 | 1080 | ctx = aead_instance_ctx(inst); |
c4caa56d EB |
1081 | err = crypto_grab_aead(&ctx->aead, aead_crypto_instance(inst), |
1082 | crypto_attr_alg_name(tb[1]), 0, mask); | |
73c89c15 | 1083 | if (err) |
c4caa56d | 1084 | goto err_free_inst; |
73c89c15 | 1085 | |
c4caa56d | 1086 | alg = crypto_spawn_aead_alg(&ctx->aead); |
73c89c15 TB |
1087 | |
1088 | err = -EINVAL; | |
1089 | ||
adcbc688 | 1090 | /* Underlying IV size must be 12. */ |
e0ab7e9c | 1091 | if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE) |
c4caa56d | 1092 | goto err_free_inst; |
73c89c15 TB |
1093 | |
1094 | /* Not a stream cipher? */ | |
adcbc688 | 1095 | if (alg->base.cra_blocksize != 1) |
c4caa56d | 1096 | goto err_free_inst; |
73c89c15 TB |
1097 | |
1098 | err = -ENAMETOOLONG; | |
adcbc688 HX |
1099 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
1100 | "rfc4543(%s)", alg->base.cra_name) >= | |
1101 | CRYPTO_MAX_ALG_NAME || | |
1102 | snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
1103 | "rfc4543(%s)", alg->base.cra_driver_name) >= | |
73c89c15 | 1104 | CRYPTO_MAX_ALG_NAME) |
c4caa56d | 1105 | goto err_free_inst; |
73c89c15 | 1106 | |
adcbc688 HX |
1107 | inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
1108 | inst->alg.base.cra_priority = alg->base.cra_priority; | |
1109 | inst->alg.base.cra_blocksize = 1; | |
1110 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask; | |
73c89c15 | 1111 | |
adcbc688 | 1112 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx); |
73c89c15 | 1113 | |
e0ab7e9c | 1114 | inst->alg.ivsize = GCM_RFC4543_IV_SIZE; |
16f37ecd | 1115 | inst->alg.chunksize = crypto_aead_alg_chunksize(alg); |
adcbc688 | 1116 | inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); |
73c89c15 | 1117 | |
adcbc688 HX |
1118 | inst->alg.init = crypto_rfc4543_init_tfm; |
1119 | inst->alg.exit = crypto_rfc4543_exit_tfm; | |
73c89c15 | 1120 | |
adcbc688 HX |
1121 | inst->alg.setkey = crypto_rfc4543_setkey; |
1122 | inst->alg.setauthsize = crypto_rfc4543_setauthsize; | |
1123 | inst->alg.encrypt = crypto_rfc4543_encrypt; | |
1124 | inst->alg.decrypt = crypto_rfc4543_decrypt; | |
73c89c15 | 1125 | |
c4caa56d | 1126 | inst->free = crypto_rfc4543_free; |
7b05a373 | 1127 | |
adcbc688 | 1128 | err = aead_register_instance(tmpl, inst); |
c4caa56d EB |
1129 | if (err) { |
1130 | err_free_inst: | |
1131 | crypto_rfc4543_free(inst); | |
1132 | } | |
adcbc688 | 1133 | return err; |
73c89c15 TB |
1134 | } |
1135 | ||
56a00d9d XW |
1136 | static struct crypto_template crypto_gcm_tmpls[] = { |
1137 | { | |
1138 | .name = "gcm_base", | |
1139 | .create = crypto_gcm_base_create, | |
1140 | .module = THIS_MODULE, | |
1141 | }, { | |
1142 | .name = "gcm", | |
1143 | .create = crypto_gcm_create, | |
1144 | .module = THIS_MODULE, | |
1145 | }, { | |
1146 | .name = "rfc4106", | |
1147 | .create = crypto_rfc4106_create, | |
1148 | .module = THIS_MODULE, | |
1149 | }, { | |
1150 | .name = "rfc4543", | |
1151 | .create = crypto_rfc4543_create, | |
1152 | .module = THIS_MODULE, | |
1153 | }, | |
73c89c15 TB |
1154 | }; |
1155 | ||
28db8e3e MH |
1156 | static int __init crypto_gcm_module_init(void) |
1157 | { | |
d00aa19b HX |
1158 | int err; |
1159 | ||
adcbc688 | 1160 | gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL); |
9382d97a HY |
1161 | if (!gcm_zeroes) |
1162 | return -ENOMEM; | |
1163 | ||
adcbc688 HX |
1164 | sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf)); |
1165 | ||
56a00d9d XW |
1166 | err = crypto_register_templates(crypto_gcm_tmpls, |
1167 | ARRAY_SIZE(crypto_gcm_tmpls)); | |
d00aa19b | 1168 | if (err) |
56a00d9d | 1169 | kfree(gcm_zeroes); |
d00aa19b | 1170 | |
9382d97a | 1171 | return err; |
28db8e3e MH |
1172 | } |
1173 | ||
1174 | static void __exit crypto_gcm_module_exit(void) | |
1175 | { | |
9382d97a | 1176 | kfree(gcm_zeroes); |
56a00d9d XW |
1177 | crypto_unregister_templates(crypto_gcm_tmpls, |
1178 | ARRAY_SIZE(crypto_gcm_tmpls)); | |
28db8e3e MH |
1179 | } |
1180 | ||
c4741b23 | 1181 | subsys_initcall(crypto_gcm_module_init); |
28db8e3e MH |
1182 | module_exit(crypto_gcm_module_exit); |
1183 | ||
1184 | MODULE_LICENSE("GPL"); | |
1185 | MODULE_DESCRIPTION("Galois/Counter Mode"); | |
1186 | MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>"); | |
5d26a105 KC |
1187 | MODULE_ALIAS_CRYPTO("gcm_base"); |
1188 | MODULE_ALIAS_CRYPTO("rfc4106"); | |
1189 | MODULE_ALIAS_CRYPTO("rfc4543"); | |
4943ba16 | 1190 | MODULE_ALIAS_CRYPTO("gcm"); |