]>
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> |
9382d97a HY |
17 | #include <crypto/hash.h> |
18 | #include "internal.h" | |
84c91152 | 19 | #include <linux/completion.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 { | |
32 | struct crypto_ablkcipher *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; | |
9489667d | 53 | struct crypto_blkcipher *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; | |
77 | struct ablkcipher_request abreq; | |
78 | } u; | |
28db8e3e MH |
79 | }; |
80 | ||
84c91152 HX |
81 | struct crypto_gcm_setkey_result { |
82 | int err; | |
83 | struct completion completion; | |
84 | }; | |
85 | ||
adcbc688 HX |
86 | static struct { |
87 | u8 buf[16]; | |
88 | struct scatterlist sg; | |
89 | } *gcm_zeroes; | |
90 | ||
91 | static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc); | |
9382d97a | 92 | |
2589469d HX |
93 | static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx( |
94 | struct aead_request *req) | |
95 | { | |
96 | unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); | |
97 | ||
98 | return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); | |
99 | } | |
100 | ||
84c91152 | 101 | static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err) |
28db8e3e | 102 | { |
84c91152 | 103 | struct crypto_gcm_setkey_result *result = req->data; |
28db8e3e | 104 | |
84c91152 HX |
105 | if (err == -EINPROGRESS) |
106 | return; | |
107 | ||
108 | result->err = err; | |
109 | complete(&result->completion); | |
28db8e3e MH |
110 | } |
111 | ||
112 | static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key, | |
113 | unsigned int keylen) | |
114 | { | |
115 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); | |
9382d97a | 116 | struct crypto_ahash *ghash = ctx->ghash; |
28db8e3e | 117 | struct crypto_ablkcipher *ctr = ctx->ctr; |
84c91152 HX |
118 | struct { |
119 | be128 hash; | |
120 | u8 iv[8]; | |
121 | ||
122 | struct crypto_gcm_setkey_result result; | |
123 | ||
124 | struct scatterlist sg[1]; | |
125 | struct ablkcipher_request req; | |
126 | } *data; | |
127 | int err; | |
28db8e3e MH |
128 | |
129 | crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK); | |
130 | crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) & | |
adcbc688 | 131 | CRYPTO_TFM_REQ_MASK); |
28db8e3e | 132 | err = crypto_ablkcipher_setkey(ctr, key, keylen); |
adcbc688 HX |
133 | crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) & |
134 | CRYPTO_TFM_RES_MASK); | |
28db8e3e | 135 | if (err) |
84c91152 | 136 | return err; |
28db8e3e | 137 | |
84c91152 HX |
138 | data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr), |
139 | GFP_KERNEL); | |
140 | if (!data) | |
141 | return -ENOMEM; | |
142 | ||
143 | init_completion(&data->result.completion); | |
144 | sg_init_one(data->sg, &data->hash, sizeof(data->hash)); | |
145 | ablkcipher_request_set_tfm(&data->req, ctr); | |
146 | ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP | | |
147 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
148 | crypto_gcm_setkey_done, | |
149 | &data->result); | |
150 | ablkcipher_request_set_crypt(&data->req, data->sg, data->sg, | |
151 | sizeof(data->hash), data->iv); | |
152 | ||
153 | err = crypto_ablkcipher_encrypt(&data->req); | |
154 | if (err == -EINPROGRESS || err == -EBUSY) { | |
155 | err = wait_for_completion_interruptible( | |
156 | &data->result.completion); | |
157 | if (!err) | |
158 | err = data->result.err; | |
159 | } | |
160 | ||
28db8e3e MH |
161 | if (err) |
162 | goto out; | |
163 | ||
9382d97a HY |
164 | crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK); |
165 | crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) & | |
166 | CRYPTO_TFM_REQ_MASK); | |
167 | err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128)); | |
168 | crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) & | |
169 | CRYPTO_TFM_RES_MASK); | |
28db8e3e | 170 | |
84c91152 | 171 | out: |
adcbc688 | 172 | kzfree(data); |
28db8e3e MH |
173 | return err; |
174 | } | |
175 | ||
dadbc53d HX |
176 | static int crypto_gcm_setauthsize(struct crypto_aead *tfm, |
177 | unsigned int authsize) | |
178 | { | |
179 | switch (authsize) { | |
180 | case 4: | |
181 | case 8: | |
182 | case 12: | |
183 | case 13: | |
184 | case 14: | |
185 | case 15: | |
186 | case 16: | |
187 | break; | |
188 | default: | |
189 | return -EINVAL; | |
190 | } | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
adcbc688 | 195 | static void crypto_gcm_init_common(struct aead_request *req) |
28db8e3e | 196 | { |
2589469d | 197 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
84c91152 | 198 | __be32 counter = cpu_to_be32(1); |
adcbc688 | 199 | struct scatterlist *sg; |
84c91152 HX |
200 | |
201 | memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag)); | |
adcbc688 HX |
202 | memcpy(pctx->iv, req->iv, 12); |
203 | memcpy(pctx->iv + 12, &counter, 4); | |
84c91152 | 204 | |
adcbc688 | 205 | sg_init_table(pctx->src, 3); |
84c91152 | 206 | sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag)); |
adcbc688 HX |
207 | sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen); |
208 | if (sg != pctx->src + 1) | |
c56f6d12 | 209 | sg_chain(pctx->src, 2, sg); |
84c91152 | 210 | |
84c91152 | 211 | if (req->src != req->dst) { |
adcbc688 | 212 | sg_init_table(pctx->dst, 3); |
84c91152 | 213 | sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag)); |
adcbc688 HX |
214 | sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen); |
215 | if (sg != pctx->dst + 1) | |
c56f6d12 | 216 | sg_chain(pctx->dst, 2, sg); |
84c91152 | 217 | } |
adcbc688 HX |
218 | } |
219 | ||
220 | static void crypto_gcm_init_crypt(struct aead_request *req, | |
221 | unsigned int cryptlen) | |
222 | { | |
223 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
224 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); | |
225 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); | |
226 | struct ablkcipher_request *ablk_req = &pctx->u.abreq; | |
227 | struct scatterlist *dst; | |
228 | ||
229 | dst = req->src == req->dst ? pctx->src : pctx->dst; | |
28db8e3e MH |
230 | |
231 | ablkcipher_request_set_tfm(ablk_req, ctx->ctr); | |
84c91152 HX |
232 | ablkcipher_request_set_crypt(ablk_req, pctx->src, dst, |
233 | cryptlen + sizeof(pctx->auth_tag), | |
adcbc688 | 234 | pctx->iv); |
9382d97a HY |
235 | } |
236 | ||
237 | static inline unsigned int gcm_remain(unsigned int len) | |
238 | { | |
239 | len &= 0xfU; | |
240 | return len ? 16 - len : 0; | |
241 | } | |
242 | ||
243 | static void gcm_hash_len_done(struct crypto_async_request *areq, int err); | |
28db8e3e | 244 | |
9382d97a | 245 | static int gcm_hash_update(struct aead_request *req, |
3e3dc25f | 246 | crypto_completion_t compl, |
9382d97a | 247 | struct scatterlist *src, |
adcbc688 | 248 | unsigned int len, u32 flags) |
9382d97a | 249 | { |
adcbc688 | 250 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a | 251 | struct ahash_request *ahreq = &pctx->u.ahreq; |
28db8e3e | 252 | |
adcbc688 | 253 | ahash_request_set_callback(ahreq, flags, compl, req); |
9382d97a HY |
254 | ahash_request_set_crypt(ahreq, src, NULL, len); |
255 | ||
256 | return crypto_ahash_update(ahreq); | |
28db8e3e MH |
257 | } |
258 | ||
9382d97a | 259 | static int gcm_hash_remain(struct aead_request *req, |
9382d97a | 260 | unsigned int remain, |
adcbc688 | 261 | crypto_completion_t compl, u32 flags) |
28db8e3e | 262 | { |
adcbc688 | 263 | return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags); |
9382d97a HY |
264 | } |
265 | ||
adcbc688 | 266 | static int gcm_hash_len(struct aead_request *req, u32 flags) |
9382d97a | 267 | { |
adcbc688 | 268 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
269 | struct ahash_request *ahreq = &pctx->u.ahreq; |
270 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
271 | u128 lengths; | |
272 | ||
273 | lengths.a = cpu_to_be64(req->assoclen * 8); | |
274 | lengths.b = cpu_to_be64(gctx->cryptlen * 8); | |
275 | memcpy(pctx->iauth_tag, &lengths, 16); | |
adcbc688 HX |
276 | sg_init_one(&pctx->sg, pctx->iauth_tag, 16); |
277 | ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req); | |
278 | ahash_request_set_crypt(ahreq, &pctx->sg, | |
279 | pctx->iauth_tag, sizeof(lengths)); | |
9382d97a | 280 | |
adcbc688 | 281 | return crypto_ahash_finup(ahreq); |
9382d97a HY |
282 | } |
283 | ||
adcbc688 | 284 | static int gcm_hash_len_continue(struct aead_request *req, u32 flags) |
9382d97a | 285 | { |
2589469d | 286 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
287 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
288 | ||
adcbc688 | 289 | return gctx->complete(req, flags); |
9382d97a HY |
290 | } |
291 | ||
adcbc688 | 292 | static void gcm_hash_len_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
293 | { |
294 | struct aead_request *req = areq->data; | |
62c5593a | 295 | |
adcbc688 HX |
296 | if (err) |
297 | goto out; | |
9382d97a | 298 | |
adcbc688 HX |
299 | err = gcm_hash_len_continue(req, 0); |
300 | if (err == -EINPROGRESS) | |
301 | return; | |
62c5593a | 302 | |
adcbc688 HX |
303 | out: |
304 | aead_request_complete(req, err); | |
62c5593a HY |
305 | } |
306 | ||
adcbc688 | 307 | static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags) |
62c5593a | 308 | { |
adcbc688 HX |
309 | return gcm_hash_len(req, flags) ?: |
310 | gcm_hash_len_continue(req, flags); | |
9382d97a HY |
311 | } |
312 | ||
62c5593a HY |
313 | static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq, |
314 | int err) | |
9382d97a HY |
315 | { |
316 | struct aead_request *req = areq->data; | |
62c5593a | 317 | |
adcbc688 HX |
318 | if (err) |
319 | goto out; | |
320 | ||
321 | err = gcm_hash_crypt_remain_continue(req, 0); | |
322 | if (err == -EINPROGRESS) | |
323 | return; | |
324 | ||
325 | out: | |
326 | aead_request_complete(req, err); | |
62c5593a HY |
327 | } |
328 | ||
adcbc688 | 329 | static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags) |
62c5593a | 330 | { |
9382d97a HY |
331 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
332 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
333 | unsigned int remain; | |
334 | ||
adcbc688 HX |
335 | remain = gcm_remain(gctx->cryptlen); |
336 | if (remain) | |
337 | return gcm_hash_remain(req, remain, | |
338 | gcm_hash_crypt_remain_done, flags) ?: | |
339 | gcm_hash_crypt_remain_continue(req, flags); | |
9382d97a | 340 | |
adcbc688 | 341 | return gcm_hash_crypt_remain_continue(req, flags); |
9382d97a HY |
342 | } |
343 | ||
62c5593a | 344 | static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
345 | { |
346 | struct aead_request *req = areq->data; | |
62c5593a | 347 | |
adcbc688 HX |
348 | if (err) |
349 | goto out; | |
350 | ||
351 | err = gcm_hash_crypt_continue(req, 0); | |
352 | if (err == -EINPROGRESS) | |
353 | return; | |
354 | ||
355 | out: | |
356 | aead_request_complete(req, err); | |
62c5593a HY |
357 | } |
358 | ||
adcbc688 | 359 | static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags) |
62c5593a | 360 | { |
9382d97a HY |
361 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
362 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
9382d97a | 363 | |
adcbc688 HX |
364 | if (gctx->cryptlen) |
365 | return gcm_hash_update(req, gcm_hash_crypt_done, | |
366 | gctx->src, gctx->cryptlen, flags) ?: | |
367 | gcm_hash_crypt_continue(req, flags); | |
368 | ||
369 | return gcm_hash_crypt_remain_continue(req, flags); | |
9382d97a HY |
370 | } |
371 | ||
62c5593a HY |
372 | static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq, |
373 | int err) | |
9382d97a HY |
374 | { |
375 | struct aead_request *req = areq->data; | |
62c5593a | 376 | |
adcbc688 HX |
377 | if (err) |
378 | goto out; | |
379 | ||
380 | err = gcm_hash_assoc_remain_continue(req, 0); | |
381 | if (err == -EINPROGRESS) | |
382 | return; | |
383 | ||
384 | out: | |
385 | aead_request_complete(req, err); | |
62c5593a HY |
386 | } |
387 | ||
adcbc688 | 388 | static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags) |
62c5593a | 389 | { |
9382d97a HY |
390 | unsigned int remain; |
391 | ||
adcbc688 HX |
392 | remain = gcm_remain(req->assoclen); |
393 | if (remain) | |
394 | return gcm_hash_remain(req, remain, | |
395 | gcm_hash_assoc_remain_done, flags) ?: | |
396 | gcm_hash_assoc_remain_continue(req, flags); | |
9382d97a | 397 | |
adcbc688 | 398 | return gcm_hash_assoc_remain_continue(req, flags); |
9382d97a HY |
399 | } |
400 | ||
62c5593a | 401 | static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
402 | { |
403 | struct aead_request *req = areq->data; | |
62c5593a | 404 | |
adcbc688 HX |
405 | if (err) |
406 | goto out; | |
407 | ||
408 | err = gcm_hash_assoc_continue(req, 0); | |
409 | if (err == -EINPROGRESS) | |
410 | return; | |
411 | ||
412 | out: | |
413 | aead_request_complete(req, err); | |
62c5593a HY |
414 | } |
415 | ||
adcbc688 | 416 | static int gcm_hash_init_continue(struct aead_request *req, u32 flags) |
62c5593a | 417 | { |
adcbc688 HX |
418 | if (req->assoclen) |
419 | return gcm_hash_update(req, gcm_hash_assoc_done, | |
420 | req->src, req->assoclen, flags) ?: | |
421 | gcm_hash_assoc_continue(req, flags); | |
9382d97a | 422 | |
adcbc688 | 423 | return gcm_hash_assoc_remain_continue(req, flags); |
62c5593a HY |
424 | } |
425 | ||
426 | static void gcm_hash_init_done(struct crypto_async_request *areq, int err) | |
427 | { | |
428 | struct aead_request *req = areq->data; | |
429 | ||
adcbc688 HX |
430 | if (err) |
431 | goto out; | |
432 | ||
433 | err = gcm_hash_init_continue(req, 0); | |
434 | if (err == -EINPROGRESS) | |
435 | return; | |
436 | ||
437 | out: | |
438 | aead_request_complete(req, err); | |
9382d97a HY |
439 | } |
440 | ||
adcbc688 | 441 | static int gcm_hash(struct aead_request *req, u32 flags) |
9382d97a | 442 | { |
adcbc688 | 443 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a | 444 | struct ahash_request *ahreq = &pctx->u.ahreq; |
adcbc688 | 445 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
9382d97a HY |
446 | |
447 | ahash_request_set_tfm(ahreq, ctx->ghash); | |
448 | ||
adcbc688 HX |
449 | ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req); |
450 | return crypto_ahash_init(ahreq) ?: | |
451 | gcm_hash_init_continue(req, flags); | |
9382d97a HY |
452 | } |
453 | ||
adcbc688 | 454 | static int gcm_enc_copy_hash(struct aead_request *req, u32 flags) |
9382d97a | 455 | { |
adcbc688 | 456 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
457 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
458 | u8 *auth_tag = pctx->auth_tag; | |
28db8e3e | 459 | |
adcbc688 HX |
460 | crypto_xor(auth_tag, pctx->iauth_tag, 16); |
461 | scatterwalk_map_and_copy(auth_tag, req->dst, | |
462 | req->assoclen + req->cryptlen, | |
6160b289 | 463 | crypto_aead_authsize(aead), 1); |
adcbc688 | 464 | return 0; |
6160b289 HX |
465 | } |
466 | ||
adcbc688 | 467 | static int gcm_encrypt_continue(struct aead_request *req, u32 flags) |
6160b289 | 468 | { |
9382d97a | 469 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
adcbc688 | 470 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
6160b289 | 471 | |
adcbc688 HX |
472 | gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst); |
473 | gctx->cryptlen = req->cryptlen; | |
474 | gctx->complete = gcm_enc_copy_hash; | |
6160b289 | 475 | |
adcbc688 | 476 | return gcm_hash(req, flags); |
28db8e3e MH |
477 | } |
478 | ||
62c5593a | 479 | static void gcm_encrypt_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
480 | { |
481 | struct aead_request *req = areq->data; | |
9382d97a | 482 | |
adcbc688 HX |
483 | if (err) |
484 | goto out; | |
485 | ||
486 | err = gcm_encrypt_continue(req, 0); | |
487 | if (err == -EINPROGRESS) | |
488 | return; | |
9382d97a | 489 | |
adcbc688 | 490 | out: |
62c5593a | 491 | aead_request_complete(req, err); |
9382d97a HY |
492 | } |
493 | ||
28db8e3e MH |
494 | static int crypto_gcm_encrypt(struct aead_request *req) |
495 | { | |
2589469d | 496 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a | 497 | struct ablkcipher_request *abreq = &pctx->u.abreq; |
adcbc688 | 498 | u32 flags = aead_request_flags(req); |
9382d97a | 499 | |
adcbc688 HX |
500 | crypto_gcm_init_common(req); |
501 | crypto_gcm_init_crypt(req, req->cryptlen); | |
502 | ablkcipher_request_set_callback(abreq, flags, gcm_encrypt_done, req); | |
9382d97a | 503 | |
adcbc688 HX |
504 | return crypto_ablkcipher_encrypt(abreq) ?: |
505 | gcm_encrypt_continue(req, flags); | |
28db8e3e MH |
506 | } |
507 | ||
adcbc688 | 508 | static int crypto_gcm_verify(struct aead_request *req) |
84c91152 | 509 | { |
adcbc688 | 510 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
84c91152 | 511 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
84c91152 HX |
512 | u8 *auth_tag = pctx->auth_tag; |
513 | u8 *iauth_tag = pctx->iauth_tag; | |
514 | unsigned int authsize = crypto_aead_authsize(aead); | |
515 | unsigned int cryptlen = req->cryptlen - authsize; | |
516 | ||
9382d97a | 517 | crypto_xor(auth_tag, iauth_tag, 16); |
adcbc688 HX |
518 | scatterwalk_map_and_copy(iauth_tag, req->src, |
519 | req->assoclen + cryptlen, authsize, 0); | |
6bf37e5a | 520 | return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0; |
84c91152 HX |
521 | } |
522 | ||
9382d97a | 523 | static void gcm_decrypt_done(struct crypto_async_request *areq, int err) |
28db8e3e | 524 | { |
84c91152 HX |
525 | struct aead_request *req = areq->data; |
526 | ||
527 | if (!err) | |
adcbc688 | 528 | err = crypto_gcm_verify(req); |
84c91152 HX |
529 | |
530 | aead_request_complete(req, err); | |
28db8e3e MH |
531 | } |
532 | ||
adcbc688 | 533 | static int gcm_dec_hash_continue(struct aead_request *req, u32 flags) |
9382d97a | 534 | { |
9382d97a HY |
535 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
536 | struct ablkcipher_request *abreq = &pctx->u.abreq; | |
537 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
538 | ||
adcbc688 HX |
539 | crypto_gcm_init_crypt(req, gctx->cryptlen); |
540 | ablkcipher_request_set_callback(abreq, flags, gcm_decrypt_done, req); | |
541 | return crypto_ablkcipher_decrypt(abreq) ?: crypto_gcm_verify(req); | |
9382d97a HY |
542 | } |
543 | ||
28db8e3e MH |
544 | static int crypto_gcm_decrypt(struct aead_request *req) |
545 | { | |
6160b289 | 546 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
2589469d | 547 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a | 548 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
6160b289 | 549 | unsigned int authsize = crypto_aead_authsize(aead); |
9382d97a | 550 | unsigned int cryptlen = req->cryptlen; |
adcbc688 | 551 | u32 flags = aead_request_flags(req); |
28db8e3e | 552 | |
6160b289 | 553 | cryptlen -= authsize; |
28db8e3e | 554 | |
adcbc688 | 555 | crypto_gcm_init_common(req); |
28db8e3e | 556 | |
adcbc688 HX |
557 | gctx->src = sg_next(pctx->src); |
558 | gctx->cryptlen = cryptlen; | |
559 | gctx->complete = gcm_dec_hash_continue; | |
28db8e3e | 560 | |
adcbc688 | 561 | return gcm_hash(req, flags); |
28db8e3e MH |
562 | } |
563 | ||
adcbc688 | 564 | static int crypto_gcm_init_tfm(struct crypto_aead *tfm) |
28db8e3e | 565 | { |
adcbc688 HX |
566 | struct aead_instance *inst = aead_alg_instance(tfm); |
567 | struct gcm_instance_ctx *ictx = aead_instance_ctx(inst); | |
568 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm); | |
28db8e3e | 569 | struct crypto_ablkcipher *ctr; |
9382d97a | 570 | struct crypto_ahash *ghash; |
28db8e3e MH |
571 | unsigned long align; |
572 | int err; | |
573 | ||
9382d97a HY |
574 | ghash = crypto_spawn_ahash(&ictx->ghash); |
575 | if (IS_ERR(ghash)) | |
576 | return PTR_ERR(ghash); | |
577 | ||
1472e5eb | 578 | ctr = crypto_spawn_skcipher(&ictx->ctr); |
28db8e3e MH |
579 | err = PTR_ERR(ctr); |
580 | if (IS_ERR(ctr)) | |
9382d97a | 581 | goto err_free_hash; |
28db8e3e MH |
582 | |
583 | ctx->ctr = ctr; | |
9382d97a | 584 | ctx->ghash = ghash; |
28db8e3e | 585 | |
adcbc688 | 586 | align = crypto_aead_alignmask(tfm); |
28db8e3e | 587 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
adcbc688 | 588 | crypto_aead_set_reqsize(tfm, |
5d72336f | 589 | align + offsetof(struct crypto_gcm_req_priv_ctx, u) + |
9382d97a HY |
590 | max(sizeof(struct ablkcipher_request) + |
591 | crypto_ablkcipher_reqsize(ctr), | |
592 | sizeof(struct ahash_request) + | |
5d72336f | 593 | crypto_ahash_reqsize(ghash))); |
28db8e3e MH |
594 | |
595 | return 0; | |
9382d97a HY |
596 | |
597 | err_free_hash: | |
598 | crypto_free_ahash(ghash); | |
599 | return err; | |
28db8e3e MH |
600 | } |
601 | ||
adcbc688 | 602 | static void crypto_gcm_exit_tfm(struct crypto_aead *tfm) |
28db8e3e | 603 | { |
adcbc688 | 604 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm); |
28db8e3e | 605 | |
9382d97a | 606 | crypto_free_ahash(ctx->ghash); |
28db8e3e MH |
607 | crypto_free_ablkcipher(ctx->ctr); |
608 | } | |
609 | ||
7b05a373 HX |
610 | static void crypto_gcm_free(struct aead_instance *inst) |
611 | { | |
612 | struct gcm_instance_ctx *ctx = aead_instance_ctx(inst); | |
613 | ||
614 | crypto_drop_skcipher(&ctx->ctr); | |
615 | crypto_drop_ahash(&ctx->ghash); | |
616 | kfree(inst); | |
617 | } | |
618 | ||
adcbc688 HX |
619 | static int crypto_gcm_create_common(struct crypto_template *tmpl, |
620 | struct rtattr **tb, | |
621 | const char *full_name, | |
622 | const char *ctr_name, | |
623 | const char *ghash_name) | |
28db8e3e | 624 | { |
d00aa19b | 625 | struct crypto_attr_type *algt; |
adcbc688 | 626 | struct aead_instance *inst; |
28db8e3e | 627 | struct crypto_alg *ctr; |
9382d97a | 628 | struct crypto_alg *ghash_alg; |
adcbc688 | 629 | struct hash_alg_common *ghash; |
28db8e3e MH |
630 | struct gcm_instance_ctx *ctx; |
631 | int err; | |
28db8e3e | 632 | |
d00aa19b | 633 | algt = crypto_get_attr_type(tb); |
d00aa19b | 634 | if (IS_ERR(algt)) |
adcbc688 | 635 | return PTR_ERR(algt); |
28db8e3e | 636 | |
5e4b8c1f | 637 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
adcbc688 | 638 | return -EINVAL; |
28db8e3e | 639 | |
9382d97a HY |
640 | ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type, |
641 | CRYPTO_ALG_TYPE_HASH, | |
b30bdfa8 HX |
642 | CRYPTO_ALG_TYPE_AHASH_MASK | |
643 | crypto_requires_sync(algt->type, | |
644 | algt->mask)); | |
9382d97a | 645 | if (IS_ERR(ghash_alg)) |
adcbc688 HX |
646 | return PTR_ERR(ghash_alg); |
647 | ||
648 | ghash = __crypto_hash_alg_common(ghash_alg); | |
9382d97a HY |
649 | |
650 | err = -ENOMEM; | |
1472e5eb HX |
651 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
652 | if (!inst) | |
9382d97a | 653 | goto out_put_ghash; |
28db8e3e | 654 | |
adcbc688 HX |
655 | ctx = aead_instance_ctx(inst); |
656 | err = crypto_init_ahash_spawn(&ctx->ghash, ghash, | |
657 | aead_crypto_instance(inst)); | |
9382d97a HY |
658 | if (err) |
659 | goto err_free_inst; | |
660 | ||
adcbc688 HX |
661 | err = -EINVAL; |
662 | if (ghash->digestsize != 16) | |
663 | goto err_drop_ghash; | |
664 | ||
665 | crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst)); | |
1472e5eb HX |
666 | err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0, |
667 | crypto_requires_sync(algt->type, | |
668 | algt->mask)); | |
669 | if (err) | |
9382d97a | 670 | goto err_drop_ghash; |
1472e5eb HX |
671 | |
672 | ctr = crypto_skcipher_spawn_alg(&ctx->ctr); | |
28db8e3e | 673 | |
d00aa19b | 674 | /* We only support 16-byte blocks. */ |
1472e5eb | 675 | if (ctr->cra_ablkcipher.ivsize != 16) |
d00aa19b HX |
676 | goto out_put_ctr; |
677 | ||
678 | /* Not a stream cipher? */ | |
679 | err = -EINVAL; | |
680 | if (ctr->cra_blocksize != 1) | |
28db8e3e MH |
681 | goto out_put_ctr; |
682 | ||
28db8e3e | 683 | err = -ENAMETOOLONG; |
adcbc688 | 684 | if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
9382d97a HY |
685 | "gcm_base(%s,%s)", ctr->cra_driver_name, |
686 | ghash_alg->cra_driver_name) >= | |
d00aa19b | 687 | CRYPTO_MAX_ALG_NAME) |
1472e5eb | 688 | goto out_put_ctr; |
28db8e3e | 689 | |
adcbc688 HX |
690 | memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME); |
691 | ||
692 | inst->alg.base.cra_flags = (ghash->base.cra_flags | ctr->cra_flags) & | |
693 | CRYPTO_ALG_ASYNC; | |
694 | inst->alg.base.cra_priority = (ghash->base.cra_priority + | |
695 | ctr->cra_priority) / 2; | |
696 | inst->alg.base.cra_blocksize = 1; | |
697 | inst->alg.base.cra_alignmask = ghash->base.cra_alignmask | | |
698 | ctr->cra_alignmask; | |
699 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx); | |
700 | inst->alg.ivsize = 12; | |
701 | inst->alg.maxauthsize = 16; | |
702 | inst->alg.init = crypto_gcm_init_tfm; | |
703 | inst->alg.exit = crypto_gcm_exit_tfm; | |
704 | inst->alg.setkey = crypto_gcm_setkey; | |
705 | inst->alg.setauthsize = crypto_gcm_setauthsize; | |
706 | inst->alg.encrypt = crypto_gcm_encrypt; | |
707 | inst->alg.decrypt = crypto_gcm_decrypt; | |
708 | ||
7b05a373 HX |
709 | inst->free = crypto_gcm_free; |
710 | ||
adcbc688 HX |
711 | err = aead_register_instance(tmpl, inst); |
712 | if (err) | |
713 | goto out_put_ctr; | |
28db8e3e | 714 | |
adcbc688 | 715 | out_put_ghash: |
9382d97a | 716 | crypto_mod_put(ghash_alg); |
adcbc688 | 717 | return err; |
1472e5eb HX |
718 | |
719 | out_put_ctr: | |
720 | crypto_drop_skcipher(&ctx->ctr); | |
9382d97a HY |
721 | err_drop_ghash: |
722 | crypto_drop_ahash(&ctx->ghash); | |
28db8e3e MH |
723 | err_free_inst: |
724 | kfree(inst); | |
adcbc688 | 725 | goto out_put_ghash; |
28db8e3e MH |
726 | } |
727 | ||
adcbc688 | 728 | static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb) |
d00aa19b | 729 | { |
d00aa19b HX |
730 | const char *cipher_name; |
731 | char ctr_name[CRYPTO_MAX_ALG_NAME]; | |
732 | char full_name[CRYPTO_MAX_ALG_NAME]; | |
733 | ||
734 | cipher_name = crypto_attr_alg_name(tb[1]); | |
d00aa19b | 735 | if (IS_ERR(cipher_name)) |
adcbc688 | 736 | return PTR_ERR(cipher_name); |
d00aa19b HX |
737 | |
738 | if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >= | |
739 | CRYPTO_MAX_ALG_NAME) | |
adcbc688 | 740 | return -ENAMETOOLONG; |
d00aa19b HX |
741 | |
742 | if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >= | |
743 | CRYPTO_MAX_ALG_NAME) | |
adcbc688 | 744 | return -ENAMETOOLONG; |
d00aa19b | 745 | |
adcbc688 HX |
746 | return crypto_gcm_create_common(tmpl, tb, full_name, |
747 | ctr_name, "ghash"); | |
d00aa19b HX |
748 | } |
749 | ||
28db8e3e MH |
750 | static struct crypto_template crypto_gcm_tmpl = { |
751 | .name = "gcm", | |
adcbc688 | 752 | .create = crypto_gcm_create, |
28db8e3e MH |
753 | .module = THIS_MODULE, |
754 | }; | |
755 | ||
adcbc688 HX |
756 | static int crypto_gcm_base_create(struct crypto_template *tmpl, |
757 | struct rtattr **tb) | |
d00aa19b | 758 | { |
d00aa19b | 759 | const char *ctr_name; |
9382d97a | 760 | const char *ghash_name; |
d00aa19b HX |
761 | char full_name[CRYPTO_MAX_ALG_NAME]; |
762 | ||
763 | ctr_name = crypto_attr_alg_name(tb[1]); | |
d00aa19b | 764 | if (IS_ERR(ctr_name)) |
adcbc688 | 765 | return PTR_ERR(ctr_name); |
d00aa19b | 766 | |
9382d97a | 767 | ghash_name = crypto_attr_alg_name(tb[2]); |
9382d97a | 768 | if (IS_ERR(ghash_name)) |
adcbc688 | 769 | return PTR_ERR(ghash_name); |
9382d97a HY |
770 | |
771 | if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)", | |
772 | ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME) | |
adcbc688 | 773 | return -ENAMETOOLONG; |
d00aa19b | 774 | |
adcbc688 HX |
775 | return crypto_gcm_create_common(tmpl, tb, full_name, |
776 | ctr_name, ghash_name); | |
d00aa19b HX |
777 | } |
778 | ||
779 | static struct crypto_template crypto_gcm_base_tmpl = { | |
780 | .name = "gcm_base", | |
adcbc688 | 781 | .create = crypto_gcm_base_create, |
d00aa19b HX |
782 | .module = THIS_MODULE, |
783 | }; | |
784 | ||
dadbc53d HX |
785 | static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key, |
786 | unsigned int keylen) | |
787 | { | |
788 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); | |
789 | struct crypto_aead *child = ctx->child; | |
790 | int err; | |
791 | ||
792 | if (keylen < 4) | |
793 | return -EINVAL; | |
794 | ||
795 | keylen -= 4; | |
796 | memcpy(ctx->nonce, key + keylen, 4); | |
797 | ||
798 | crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
799 | crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & | |
800 | CRYPTO_TFM_REQ_MASK); | |
801 | err = crypto_aead_setkey(child, key, keylen); | |
802 | crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & | |
803 | CRYPTO_TFM_RES_MASK); | |
804 | ||
805 | return err; | |
806 | } | |
807 | ||
808 | static int crypto_rfc4106_setauthsize(struct crypto_aead *parent, | |
809 | unsigned int authsize) | |
810 | { | |
811 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); | |
812 | ||
813 | switch (authsize) { | |
814 | case 8: | |
815 | case 12: | |
816 | case 16: | |
817 | break; | |
818 | default: | |
819 | return -EINVAL; | |
820 | } | |
821 | ||
822 | return crypto_aead_setauthsize(ctx->child, authsize); | |
823 | } | |
824 | ||
825 | static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req) | |
826 | { | |
7b05a373 | 827 | struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req); |
dadbc53d HX |
828 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
829 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead); | |
7b05a373 | 830 | struct aead_request *subreq = &rctx->subreq; |
dadbc53d | 831 | struct crypto_aead *child = ctx->child; |
7b05a373 | 832 | struct scatterlist *sg; |
dadbc53d HX |
833 | u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child), |
834 | crypto_aead_alignmask(child) + 1); | |
835 | ||
7b05a373 HX |
836 | scatterwalk_map_and_copy(iv + 12, req->src, 0, req->assoclen - 8, 0); |
837 | ||
dadbc53d HX |
838 | memcpy(iv, ctx->nonce, 4); |
839 | memcpy(iv + 4, req->iv, 8); | |
840 | ||
7b05a373 HX |
841 | sg_init_table(rctx->src, 3); |
842 | sg_set_buf(rctx->src, iv + 12, req->assoclen - 8); | |
843 | sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen); | |
844 | if (sg != rctx->src + 1) | |
845 | sg_chain(rctx->src, 2, sg); | |
846 | ||
847 | if (req->src != req->dst) { | |
848 | sg_init_table(rctx->dst, 3); | |
849 | sg_set_buf(rctx->dst, iv + 12, req->assoclen - 8); | |
850 | sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen); | |
851 | if (sg != rctx->dst + 1) | |
852 | sg_chain(rctx->dst, 2, sg); | |
853 | } | |
854 | ||
dadbc53d HX |
855 | aead_request_set_tfm(subreq, child); |
856 | aead_request_set_callback(subreq, req->base.flags, req->base.complete, | |
857 | req->base.data); | |
7b05a373 HX |
858 | aead_request_set_crypt(subreq, rctx->src, |
859 | req->src == req->dst ? rctx->src : rctx->dst, | |
860 | req->cryptlen, iv); | |
861 | aead_request_set_ad(subreq, req->assoclen - 8); | |
dadbc53d HX |
862 | |
863 | return subreq; | |
864 | } | |
865 | ||
866 | static int crypto_rfc4106_encrypt(struct aead_request *req) | |
867 | { | |
7b05a373 HX |
868 | if (req->assoclen != 16 && req->assoclen != 20) |
869 | return -EINVAL; | |
870 | ||
dadbc53d HX |
871 | req = crypto_rfc4106_crypt(req); |
872 | ||
873 | return crypto_aead_encrypt(req); | |
874 | } | |
875 | ||
876 | static int crypto_rfc4106_decrypt(struct aead_request *req) | |
877 | { | |
7b05a373 HX |
878 | if (req->assoclen != 16 && req->assoclen != 20) |
879 | return -EINVAL; | |
880 | ||
dadbc53d HX |
881 | req = crypto_rfc4106_crypt(req); |
882 | ||
883 | return crypto_aead_decrypt(req); | |
884 | } | |
885 | ||
adcbc688 | 886 | static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm) |
dadbc53d | 887 | { |
adcbc688 HX |
888 | struct aead_instance *inst = aead_alg_instance(tfm); |
889 | struct crypto_aead_spawn *spawn = aead_instance_ctx(inst); | |
890 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm); | |
dadbc53d HX |
891 | struct crypto_aead *aead; |
892 | unsigned long align; | |
893 | ||
894 | aead = crypto_spawn_aead(spawn); | |
895 | if (IS_ERR(aead)) | |
896 | return PTR_ERR(aead); | |
897 | ||
898 | ctx->child = aead; | |
899 | ||
900 | align = crypto_aead_alignmask(aead); | |
901 | align &= ~(crypto_tfm_ctx_alignment() - 1); | |
adcbc688 HX |
902 | crypto_aead_set_reqsize( |
903 | tfm, | |
7b05a373 | 904 | sizeof(struct crypto_rfc4106_req_ctx) + |
5d72336f | 905 | ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + |
7b05a373 | 906 | align + 24); |
dadbc53d HX |
907 | |
908 | return 0; | |
909 | } | |
910 | ||
adcbc688 | 911 | static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm) |
dadbc53d | 912 | { |
adcbc688 | 913 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm); |
dadbc53d HX |
914 | |
915 | crypto_free_aead(ctx->child); | |
916 | } | |
917 | ||
7b05a373 HX |
918 | static void crypto_rfc4106_free(struct aead_instance *inst) |
919 | { | |
920 | crypto_drop_aead(aead_instance_ctx(inst)); | |
921 | kfree(inst); | |
922 | } | |
923 | ||
adcbc688 HX |
924 | static int crypto_rfc4106_create(struct crypto_template *tmpl, |
925 | struct rtattr **tb) | |
dadbc53d HX |
926 | { |
927 | struct crypto_attr_type *algt; | |
adcbc688 | 928 | struct aead_instance *inst; |
dadbc53d | 929 | struct crypto_aead_spawn *spawn; |
adcbc688 | 930 | struct aead_alg *alg; |
dadbc53d HX |
931 | const char *ccm_name; |
932 | int err; | |
933 | ||
934 | algt = crypto_get_attr_type(tb); | |
dadbc53d | 935 | if (IS_ERR(algt)) |
adcbc688 | 936 | return PTR_ERR(algt); |
dadbc53d | 937 | |
5e4b8c1f | 938 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
adcbc688 | 939 | return -EINVAL; |
dadbc53d HX |
940 | |
941 | ccm_name = crypto_attr_alg_name(tb[1]); | |
dadbc53d | 942 | if (IS_ERR(ccm_name)) |
adcbc688 | 943 | return PTR_ERR(ccm_name); |
dadbc53d HX |
944 | |
945 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
946 | if (!inst) | |
adcbc688 | 947 | return -ENOMEM; |
dadbc53d | 948 | |
adcbc688 HX |
949 | spawn = aead_instance_ctx(inst); |
950 | crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); | |
dadbc53d HX |
951 | err = crypto_grab_aead(spawn, ccm_name, 0, |
952 | crypto_requires_sync(algt->type, algt->mask)); | |
953 | if (err) | |
954 | goto out_free_inst; | |
955 | ||
adcbc688 | 956 | alg = crypto_spawn_aead_alg(spawn); |
dadbc53d HX |
957 | |
958 | err = -EINVAL; | |
959 | ||
adcbc688 HX |
960 | /* Underlying IV size must be 12. */ |
961 | if (crypto_aead_alg_ivsize(alg) != 12) | |
dadbc53d HX |
962 | goto out_drop_alg; |
963 | ||
964 | /* Not a stream cipher? */ | |
adcbc688 | 965 | if (alg->base.cra_blocksize != 1) |
dadbc53d HX |
966 | goto out_drop_alg; |
967 | ||
968 | err = -ENAMETOOLONG; | |
adcbc688 HX |
969 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
970 | "rfc4106(%s)", alg->base.cra_name) >= | |
971 | CRYPTO_MAX_ALG_NAME || | |
972 | snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
973 | "rfc4106(%s)", alg->base.cra_driver_name) >= | |
dadbc53d HX |
974 | CRYPTO_MAX_ALG_NAME) |
975 | goto out_drop_alg; | |
976 | ||
7b05a373 | 977 | inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
adcbc688 HX |
978 | inst->alg.base.cra_priority = alg->base.cra_priority; |
979 | inst->alg.base.cra_blocksize = 1; | |
980 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask; | |
dadbc53d | 981 | |
adcbc688 | 982 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx); |
dadbc53d | 983 | |
adcbc688 HX |
984 | inst->alg.ivsize = 8; |
985 | inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); | |
dadbc53d | 986 | |
adcbc688 HX |
987 | inst->alg.init = crypto_rfc4106_init_tfm; |
988 | inst->alg.exit = crypto_rfc4106_exit_tfm; | |
dadbc53d | 989 | |
adcbc688 HX |
990 | inst->alg.setkey = crypto_rfc4106_setkey; |
991 | inst->alg.setauthsize = crypto_rfc4106_setauthsize; | |
992 | inst->alg.encrypt = crypto_rfc4106_encrypt; | |
993 | inst->alg.decrypt = crypto_rfc4106_decrypt; | |
dadbc53d | 994 | |
7b05a373 HX |
995 | inst->free = crypto_rfc4106_free; |
996 | ||
adcbc688 HX |
997 | err = aead_register_instance(tmpl, inst); |
998 | if (err) | |
999 | goto out_drop_alg; | |
dadbc53d HX |
1000 | |
1001 | out: | |
adcbc688 | 1002 | return err; |
dadbc53d HX |
1003 | |
1004 | out_drop_alg: | |
1005 | crypto_drop_aead(spawn); | |
1006 | out_free_inst: | |
1007 | kfree(inst); | |
dadbc53d HX |
1008 | goto out; |
1009 | } | |
1010 | ||
dadbc53d HX |
1011 | static struct crypto_template crypto_rfc4106_tmpl = { |
1012 | .name = "rfc4106", | |
adcbc688 | 1013 | .create = crypto_rfc4106_create, |
dadbc53d HX |
1014 | .module = THIS_MODULE, |
1015 | }; | |
1016 | ||
73c89c15 TB |
1017 | static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key, |
1018 | unsigned int keylen) | |
1019 | { | |
1020 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent); | |
1021 | struct crypto_aead *child = ctx->child; | |
1022 | int err; | |
1023 | ||
1024 | if (keylen < 4) | |
1025 | return -EINVAL; | |
1026 | ||
1027 | keylen -= 4; | |
1028 | memcpy(ctx->nonce, key + keylen, 4); | |
1029 | ||
1030 | crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
1031 | crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & | |
1032 | CRYPTO_TFM_REQ_MASK); | |
1033 | err = crypto_aead_setkey(child, key, keylen); | |
1034 | crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & | |
1035 | CRYPTO_TFM_RES_MASK); | |
1036 | ||
1037 | return err; | |
1038 | } | |
1039 | ||
1040 | static int crypto_rfc4543_setauthsize(struct crypto_aead *parent, | |
1041 | unsigned int authsize) | |
1042 | { | |
1043 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent); | |
1044 | ||
1045 | if (authsize != 16) | |
1046 | return -EINVAL; | |
1047 | ||
1048 | return crypto_aead_setauthsize(ctx->child, authsize); | |
1049 | } | |
1050 | ||
adcbc688 | 1051 | static int crypto_rfc4543_crypt(struct aead_request *req, bool enc) |
73c89c15 TB |
1052 | { |
1053 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
1054 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead); | |
adcbc688 | 1055 | struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req); |
73c89c15 | 1056 | struct aead_request *subreq = &rctx->subreq; |
73c89c15 | 1057 | unsigned int authsize = crypto_aead_authsize(aead); |
73c89c15 TB |
1058 | u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child), |
1059 | crypto_aead_alignmask(ctx->child) + 1); | |
adcbc688 HX |
1060 | int err; |
1061 | ||
1062 | if (req->src != req->dst) { | |
1063 | err = crypto_rfc4543_copy_src_to_dst(req, enc); | |
1064 | if (err) | |
1065 | return err; | |
1066 | } | |
73c89c15 TB |
1067 | |
1068 | memcpy(iv, ctx->nonce, 4); | |
1069 | memcpy(iv + 4, req->iv, 8); | |
1070 | ||
73c89c15 | 1071 | aead_request_set_tfm(subreq, ctx->child); |
adcbc688 HX |
1072 | aead_request_set_callback(subreq, req->base.flags, |
1073 | req->base.complete, req->base.data); | |
1074 | aead_request_set_crypt(subreq, req->src, req->dst, | |
1075 | enc ? 0 : authsize, iv); | |
1076 | aead_request_set_ad(subreq, req->assoclen + req->cryptlen - | |
1077 | subreq->cryptlen); | |
1078 | ||
1079 | return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq); | |
73c89c15 TB |
1080 | } |
1081 | ||
9489667d JK |
1082 | static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc) |
1083 | { | |
1084 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
1085 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead); | |
1086 | unsigned int authsize = crypto_aead_authsize(aead); | |
adcbc688 HX |
1087 | unsigned int nbytes = req->assoclen + req->cryptlen - |
1088 | (enc ? 0 : authsize); | |
9489667d JK |
1089 | struct blkcipher_desc desc = { |
1090 | .tfm = ctx->null, | |
1091 | }; | |
1092 | ||
1093 | return crypto_blkcipher_encrypt(&desc, req->dst, req->src, nbytes); | |
1094 | } | |
1095 | ||
73c89c15 TB |
1096 | static int crypto_rfc4543_encrypt(struct aead_request *req) |
1097 | { | |
adcbc688 | 1098 | return crypto_rfc4543_crypt(req, true); |
73c89c15 TB |
1099 | } |
1100 | ||
1101 | static int crypto_rfc4543_decrypt(struct aead_request *req) | |
1102 | { | |
adcbc688 | 1103 | return crypto_rfc4543_crypt(req, false); |
73c89c15 TB |
1104 | } |
1105 | ||
adcbc688 | 1106 | static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm) |
73c89c15 | 1107 | { |
adcbc688 HX |
1108 | struct aead_instance *inst = aead_alg_instance(tfm); |
1109 | struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst); | |
9489667d | 1110 | struct crypto_aead_spawn *spawn = &ictx->aead; |
adcbc688 | 1111 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm); |
73c89c15 | 1112 | struct crypto_aead *aead; |
9489667d | 1113 | struct crypto_blkcipher *null; |
73c89c15 | 1114 | unsigned long align; |
9489667d | 1115 | int err = 0; |
73c89c15 TB |
1116 | |
1117 | aead = crypto_spawn_aead(spawn); | |
1118 | if (IS_ERR(aead)) | |
1119 | return PTR_ERR(aead); | |
1120 | ||
17db8546 | 1121 | null = crypto_get_default_null_skcipher(); |
9489667d JK |
1122 | err = PTR_ERR(null); |
1123 | if (IS_ERR(null)) | |
1124 | goto err_free_aead; | |
1125 | ||
73c89c15 | 1126 | ctx->child = aead; |
9489667d | 1127 | ctx->null = null; |
73c89c15 TB |
1128 | |
1129 | align = crypto_aead_alignmask(aead); | |
1130 | align &= ~(crypto_tfm_ctx_alignment() - 1); | |
adcbc688 HX |
1131 | crypto_aead_set_reqsize( |
1132 | tfm, | |
5d72336f HX |
1133 | sizeof(struct crypto_rfc4543_req_ctx) + |
1134 | ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + | |
adcbc688 | 1135 | align + 12); |
73c89c15 TB |
1136 | |
1137 | return 0; | |
9489667d JK |
1138 | |
1139 | err_free_aead: | |
1140 | crypto_free_aead(aead); | |
1141 | return err; | |
73c89c15 TB |
1142 | } |
1143 | ||
adcbc688 | 1144 | static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm) |
73c89c15 | 1145 | { |
adcbc688 | 1146 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm); |
73c89c15 TB |
1147 | |
1148 | crypto_free_aead(ctx->child); | |
17db8546 | 1149 | crypto_put_default_null_skcipher(); |
73c89c15 TB |
1150 | } |
1151 | ||
7b05a373 HX |
1152 | static void crypto_rfc4543_free(struct aead_instance *inst) |
1153 | { | |
1154 | struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst); | |
1155 | ||
1156 | crypto_drop_aead(&ctx->aead); | |
1157 | ||
1158 | kfree(inst); | |
1159 | } | |
1160 | ||
adcbc688 HX |
1161 | static int crypto_rfc4543_create(struct crypto_template *tmpl, |
1162 | struct rtattr **tb) | |
73c89c15 TB |
1163 | { |
1164 | struct crypto_attr_type *algt; | |
adcbc688 | 1165 | struct aead_instance *inst; |
73c89c15 | 1166 | struct crypto_aead_spawn *spawn; |
adcbc688 | 1167 | struct aead_alg *alg; |
9489667d | 1168 | struct crypto_rfc4543_instance_ctx *ctx; |
73c89c15 TB |
1169 | const char *ccm_name; |
1170 | int err; | |
1171 | ||
1172 | algt = crypto_get_attr_type(tb); | |
73c89c15 | 1173 | if (IS_ERR(algt)) |
adcbc688 | 1174 | return PTR_ERR(algt); |
73c89c15 | 1175 | |
5e4b8c1f | 1176 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
adcbc688 | 1177 | return -EINVAL; |
73c89c15 TB |
1178 | |
1179 | ccm_name = crypto_attr_alg_name(tb[1]); | |
73c89c15 | 1180 | if (IS_ERR(ccm_name)) |
adcbc688 | 1181 | return PTR_ERR(ccm_name); |
73c89c15 | 1182 | |
9489667d | 1183 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
73c89c15 | 1184 | if (!inst) |
adcbc688 | 1185 | return -ENOMEM; |
73c89c15 | 1186 | |
adcbc688 | 1187 | ctx = aead_instance_ctx(inst); |
9489667d | 1188 | spawn = &ctx->aead; |
adcbc688 | 1189 | crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); |
73c89c15 TB |
1190 | err = crypto_grab_aead(spawn, ccm_name, 0, |
1191 | crypto_requires_sync(algt->type, algt->mask)); | |
1192 | if (err) | |
1193 | goto out_free_inst; | |
1194 | ||
adcbc688 | 1195 | alg = crypto_spawn_aead_alg(spawn); |
73c89c15 TB |
1196 | |
1197 | err = -EINVAL; | |
1198 | ||
adcbc688 HX |
1199 | /* Underlying IV size must be 12. */ |
1200 | if (crypto_aead_alg_ivsize(alg) != 12) | |
17db8546 | 1201 | goto out_drop_alg; |
73c89c15 TB |
1202 | |
1203 | /* Not a stream cipher? */ | |
adcbc688 | 1204 | if (alg->base.cra_blocksize != 1) |
17db8546 | 1205 | goto out_drop_alg; |
73c89c15 TB |
1206 | |
1207 | err = -ENAMETOOLONG; | |
adcbc688 HX |
1208 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
1209 | "rfc4543(%s)", alg->base.cra_name) >= | |
1210 | CRYPTO_MAX_ALG_NAME || | |
1211 | snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
1212 | "rfc4543(%s)", alg->base.cra_driver_name) >= | |
73c89c15 | 1213 | CRYPTO_MAX_ALG_NAME) |
17db8546 | 1214 | goto out_drop_alg; |
73c89c15 | 1215 | |
adcbc688 HX |
1216 | inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
1217 | inst->alg.base.cra_priority = alg->base.cra_priority; | |
1218 | inst->alg.base.cra_blocksize = 1; | |
1219 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask; | |
73c89c15 | 1220 | |
adcbc688 | 1221 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx); |
73c89c15 | 1222 | |
adcbc688 HX |
1223 | inst->alg.ivsize = 8; |
1224 | inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); | |
73c89c15 | 1225 | |
adcbc688 HX |
1226 | inst->alg.init = crypto_rfc4543_init_tfm; |
1227 | inst->alg.exit = crypto_rfc4543_exit_tfm; | |
73c89c15 | 1228 | |
adcbc688 HX |
1229 | inst->alg.setkey = crypto_rfc4543_setkey; |
1230 | inst->alg.setauthsize = crypto_rfc4543_setauthsize; | |
1231 | inst->alg.encrypt = crypto_rfc4543_encrypt; | |
1232 | inst->alg.decrypt = crypto_rfc4543_decrypt; | |
73c89c15 | 1233 | |
7b05a373 HX |
1234 | inst->free = crypto_rfc4543_free, |
1235 | ||
adcbc688 HX |
1236 | err = aead_register_instance(tmpl, inst); |
1237 | if (err) | |
1238 | goto out_drop_alg; | |
73c89c15 TB |
1239 | |
1240 | out: | |
adcbc688 | 1241 | return err; |
73c89c15 TB |
1242 | |
1243 | out_drop_alg: | |
1244 | crypto_drop_aead(spawn); | |
1245 | out_free_inst: | |
1246 | kfree(inst); | |
73c89c15 TB |
1247 | goto out; |
1248 | } | |
1249 | ||
73c89c15 TB |
1250 | static struct crypto_template crypto_rfc4543_tmpl = { |
1251 | .name = "rfc4543", | |
adcbc688 | 1252 | .create = crypto_rfc4543_create, |
73c89c15 TB |
1253 | .module = THIS_MODULE, |
1254 | }; | |
1255 | ||
28db8e3e MH |
1256 | static int __init crypto_gcm_module_init(void) |
1257 | { | |
d00aa19b HX |
1258 | int err; |
1259 | ||
adcbc688 | 1260 | gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL); |
9382d97a HY |
1261 | if (!gcm_zeroes) |
1262 | return -ENOMEM; | |
1263 | ||
adcbc688 HX |
1264 | sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf)); |
1265 | ||
d00aa19b HX |
1266 | err = crypto_register_template(&crypto_gcm_base_tmpl); |
1267 | if (err) | |
1268 | goto out; | |
1269 | ||
1270 | err = crypto_register_template(&crypto_gcm_tmpl); | |
1271 | if (err) | |
1272 | goto out_undo_base; | |
1273 | ||
dadbc53d HX |
1274 | err = crypto_register_template(&crypto_rfc4106_tmpl); |
1275 | if (err) | |
1276 | goto out_undo_gcm; | |
1277 | ||
73c89c15 TB |
1278 | err = crypto_register_template(&crypto_rfc4543_tmpl); |
1279 | if (err) | |
1280 | goto out_undo_rfc4106; | |
1281 | ||
9382d97a | 1282 | return 0; |
d00aa19b | 1283 | |
73c89c15 TB |
1284 | out_undo_rfc4106: |
1285 | crypto_unregister_template(&crypto_rfc4106_tmpl); | |
dadbc53d HX |
1286 | out_undo_gcm: |
1287 | crypto_unregister_template(&crypto_gcm_tmpl); | |
d00aa19b HX |
1288 | out_undo_base: |
1289 | crypto_unregister_template(&crypto_gcm_base_tmpl); | |
9382d97a HY |
1290 | out: |
1291 | kfree(gcm_zeroes); | |
1292 | return err; | |
28db8e3e MH |
1293 | } |
1294 | ||
1295 | static void __exit crypto_gcm_module_exit(void) | |
1296 | { | |
9382d97a | 1297 | kfree(gcm_zeroes); |
73c89c15 | 1298 | crypto_unregister_template(&crypto_rfc4543_tmpl); |
dadbc53d | 1299 | crypto_unregister_template(&crypto_rfc4106_tmpl); |
28db8e3e | 1300 | crypto_unregister_template(&crypto_gcm_tmpl); |
d00aa19b | 1301 | crypto_unregister_template(&crypto_gcm_base_tmpl); |
28db8e3e MH |
1302 | } |
1303 | ||
1304 | module_init(crypto_gcm_module_init); | |
1305 | module_exit(crypto_gcm_module_exit); | |
1306 | ||
1307 | MODULE_LICENSE("GPL"); | |
1308 | MODULE_DESCRIPTION("Galois/Counter Mode"); | |
1309 | MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>"); | |
5d26a105 KC |
1310 | MODULE_ALIAS_CRYPTO("gcm_base"); |
1311 | MODULE_ALIAS_CRYPTO("rfc4106"); | |
1312 | MODULE_ALIAS_CRYPTO("rfc4543"); | |
4943ba16 | 1313 | MODULE_ALIAS_CRYPTO("gcm"); |