Commit | Line | Data |
---|---|---|
28db8e3e MH |
1 | /* |
2 | * GCM: Galois/Counter Mode. | |
3 | * | |
4 | * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License version 2 as published | |
8 | * by the Free Software Foundation. | |
9 | */ | |
10 | ||
28db8e3e | 11 | #include <crypto/gf128mul.h> |
dadbc53d | 12 | #include <crypto/internal/aead.h> |
1472e5eb | 13 | #include <crypto/internal/skcipher.h> |
9382d97a | 14 | #include <crypto/internal/hash.h> |
17db8546 | 15 | #include <crypto/null.h> |
42c271c6 | 16 | #include <crypto/scatterwalk.h> |
e0ab7e9c | 17 | #include <crypto/gcm.h> |
9382d97a HY |
18 | #include <crypto/hash.h> |
19 | #include "internal.h" | |
84c91152 | 20 | #include <linux/completion.h> |
28db8e3e MH |
21 | #include <linux/err.h> |
22 | #include <linux/init.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/slab.h> | |
26 | ||
28db8e3e | 27 | struct gcm_instance_ctx { |
1472e5eb | 28 | struct crypto_skcipher_spawn ctr; |
9382d97a | 29 | struct crypto_ahash_spawn ghash; |
28db8e3e MH |
30 | }; |
31 | ||
32 | struct crypto_gcm_ctx { | |
16f37ecd | 33 | struct crypto_skcipher *ctr; |
9382d97a | 34 | struct crypto_ahash *ghash; |
28db8e3e MH |
35 | }; |
36 | ||
dadbc53d HX |
37 | struct crypto_rfc4106_ctx { |
38 | struct crypto_aead *child; | |
39 | u8 nonce[4]; | |
40 | }; | |
41 | ||
7b05a373 HX |
42 | struct crypto_rfc4106_req_ctx { |
43 | struct scatterlist src[3]; | |
44 | struct scatterlist dst[3]; | |
45 | struct aead_request subreq; | |
46 | }; | |
47 | ||
9489667d JK |
48 | struct crypto_rfc4543_instance_ctx { |
49 | struct crypto_aead_spawn aead; | |
9489667d JK |
50 | }; |
51 | ||
73c89c15 TB |
52 | struct crypto_rfc4543_ctx { |
53 | struct crypto_aead *child; | |
16f37ecd | 54 | struct crypto_skcipher *null; |
73c89c15 TB |
55 | u8 nonce[4]; |
56 | }; | |
57 | ||
58 | struct crypto_rfc4543_req_ctx { | |
73c89c15 TB |
59 | struct aead_request subreq; |
60 | }; | |
61 | ||
28db8e3e | 62 | struct crypto_gcm_ghash_ctx { |
9382d97a HY |
63 | unsigned int cryptlen; |
64 | struct scatterlist *src; | |
adcbc688 | 65 | int (*complete)(struct aead_request *req, u32 flags); |
28db8e3e MH |
66 | }; |
67 | ||
68 | struct crypto_gcm_req_priv_ctx { | |
adcbc688 | 69 | u8 iv[16]; |
28db8e3e | 70 | u8 auth_tag[16]; |
6160b289 | 71 | u8 iauth_tag[16]; |
adcbc688 HX |
72 | struct scatterlist src[3]; |
73 | struct scatterlist dst[3]; | |
74 | struct scatterlist sg; | |
9382d97a HY |
75 | struct crypto_gcm_ghash_ctx ghash_ctx; |
76 | union { | |
77 | struct ahash_request ahreq; | |
16f37ecd | 78 | struct skcipher_request skreq; |
9382d97a | 79 | } u; |
28db8e3e MH |
80 | }; |
81 | ||
84c91152 HX |
82 | struct crypto_gcm_setkey_result { |
83 | int err; | |
84 | struct completion completion; | |
85 | }; | |
86 | ||
adcbc688 HX |
87 | static struct { |
88 | u8 buf[16]; | |
89 | struct scatterlist sg; | |
90 | } *gcm_zeroes; | |
91 | ||
92 | static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc); | |
9382d97a | 93 | |
2589469d HX |
94 | static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx( |
95 | struct aead_request *req) | |
96 | { | |
97 | unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); | |
98 | ||
99 | return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); | |
100 | } | |
101 | ||
84c91152 | 102 | static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err) |
28db8e3e | 103 | { |
84c91152 | 104 | struct crypto_gcm_setkey_result *result = req->data; |
28db8e3e | 105 | |
84c91152 HX |
106 | if (err == -EINPROGRESS) |
107 | return; | |
108 | ||
109 | result->err = err; | |
110 | complete(&result->completion); | |
28db8e3e MH |
111 | } |
112 | ||
113 | static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key, | |
114 | unsigned int keylen) | |
115 | { | |
116 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); | |
9382d97a | 117 | struct crypto_ahash *ghash = ctx->ghash; |
16f37ecd | 118 | struct crypto_skcipher *ctr = ctx->ctr; |
84c91152 HX |
119 | struct { |
120 | be128 hash; | |
50d2e6dc | 121 | u8 iv[16]; |
84c91152 HX |
122 | |
123 | struct crypto_gcm_setkey_result result; | |
124 | ||
125 | struct scatterlist sg[1]; | |
16f37ecd | 126 | struct skcipher_request req; |
84c91152 HX |
127 | } *data; |
128 | int err; | |
28db8e3e | 129 | |
16f37ecd HX |
130 | crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK); |
131 | crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) & | |
132 | CRYPTO_TFM_REQ_MASK); | |
133 | err = crypto_skcipher_setkey(ctr, key, keylen); | |
134 | crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) & | |
adcbc688 | 135 | CRYPTO_TFM_RES_MASK); |
28db8e3e | 136 | if (err) |
84c91152 | 137 | return err; |
28db8e3e | 138 | |
16f37ecd | 139 | data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr), |
84c91152 HX |
140 | GFP_KERNEL); |
141 | if (!data) | |
142 | return -ENOMEM; | |
143 | ||
144 | init_completion(&data->result.completion); | |
145 | sg_init_one(data->sg, &data->hash, sizeof(data->hash)); | |
16f37ecd HX |
146 | skcipher_request_set_tfm(&data->req, ctr); |
147 | skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP | | |
148 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
149 | crypto_gcm_setkey_done, | |
150 | &data->result); | |
151 | skcipher_request_set_crypt(&data->req, data->sg, data->sg, | |
152 | sizeof(data->hash), data->iv); | |
153 | ||
154 | err = crypto_skcipher_encrypt(&data->req); | |
84c91152 | 155 | if (err == -EINPROGRESS || err == -EBUSY) { |
f3ad5870 GBY |
156 | wait_for_completion(&data->result.completion); |
157 | err = data->result.err; | |
84c91152 HX |
158 | } |
159 | ||
28db8e3e MH |
160 | if (err) |
161 | goto out; | |
162 | ||
9382d97a HY |
163 | crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK); |
164 | crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) & | |
165 | CRYPTO_TFM_REQ_MASK); | |
166 | err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128)); | |
167 | crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) & | |
168 | CRYPTO_TFM_RES_MASK); | |
28db8e3e | 169 | |
84c91152 | 170 | out: |
adcbc688 | 171 | kzfree(data); |
28db8e3e MH |
172 | return err; |
173 | } | |
174 | ||
dadbc53d HX |
175 | static int crypto_gcm_setauthsize(struct crypto_aead *tfm, |
176 | unsigned int authsize) | |
177 | { | |
178 | switch (authsize) { | |
179 | case 4: | |
180 | case 8: | |
181 | case 12: | |
182 | case 13: | |
183 | case 14: | |
184 | case 15: | |
185 | case 16: | |
186 | break; | |
187 | default: | |
188 | return -EINVAL; | |
189 | } | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
adcbc688 | 194 | static void crypto_gcm_init_common(struct aead_request *req) |
28db8e3e | 195 | { |
2589469d | 196 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
84c91152 | 197 | __be32 counter = cpu_to_be32(1); |
adcbc688 | 198 | struct scatterlist *sg; |
84c91152 HX |
199 | |
200 | memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag)); | |
e0ab7e9c CL |
201 | memcpy(pctx->iv, req->iv, GCM_AES_IV_SIZE); |
202 | memcpy(pctx->iv + GCM_AES_IV_SIZE, &counter, 4); | |
84c91152 | 203 | |
adcbc688 | 204 | sg_init_table(pctx->src, 3); |
84c91152 | 205 | sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag)); |
adcbc688 HX |
206 | sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen); |
207 | if (sg != pctx->src + 1) | |
c56f6d12 | 208 | sg_chain(pctx->src, 2, sg); |
84c91152 | 209 | |
84c91152 | 210 | if (req->src != req->dst) { |
adcbc688 | 211 | sg_init_table(pctx->dst, 3); |
84c91152 | 212 | sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag)); |
adcbc688 HX |
213 | sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen); |
214 | if (sg != pctx->dst + 1) | |
c56f6d12 | 215 | sg_chain(pctx->dst, 2, sg); |
84c91152 | 216 | } |
adcbc688 HX |
217 | } |
218 | ||
219 | static void crypto_gcm_init_crypt(struct aead_request *req, | |
220 | unsigned int cryptlen) | |
221 | { | |
222 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
223 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); | |
224 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); | |
16f37ecd | 225 | struct skcipher_request *skreq = &pctx->u.skreq; |
adcbc688 HX |
226 | struct scatterlist *dst; |
227 | ||
228 | dst = req->src == req->dst ? pctx->src : pctx->dst; | |
28db8e3e | 229 | |
16f37ecd HX |
230 | skcipher_request_set_tfm(skreq, ctx->ctr); |
231 | skcipher_request_set_crypt(skreq, pctx->src, dst, | |
84c91152 | 232 | cryptlen + sizeof(pctx->auth_tag), |
adcbc688 | 233 | pctx->iv); |
9382d97a HY |
234 | } |
235 | ||
236 | static inline unsigned int gcm_remain(unsigned int len) | |
237 | { | |
238 | len &= 0xfU; | |
239 | return len ? 16 - len : 0; | |
240 | } | |
241 | ||
242 | static void gcm_hash_len_done(struct crypto_async_request *areq, int err); | |
28db8e3e | 243 | |
9382d97a | 244 | static int gcm_hash_update(struct aead_request *req, |
3e3dc25f | 245 | crypto_completion_t compl, |
9382d97a | 246 | struct scatterlist *src, |
adcbc688 | 247 | unsigned int len, u32 flags) |
9382d97a | 248 | { |
adcbc688 | 249 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a | 250 | struct ahash_request *ahreq = &pctx->u.ahreq; |
28db8e3e | 251 | |
adcbc688 | 252 | ahash_request_set_callback(ahreq, flags, compl, req); |
9382d97a HY |
253 | ahash_request_set_crypt(ahreq, src, NULL, len); |
254 | ||
255 | return crypto_ahash_update(ahreq); | |
28db8e3e MH |
256 | } |
257 | ||
9382d97a | 258 | static int gcm_hash_remain(struct aead_request *req, |
9382d97a | 259 | unsigned int remain, |
adcbc688 | 260 | crypto_completion_t compl, u32 flags) |
28db8e3e | 261 | { |
adcbc688 | 262 | return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags); |
9382d97a HY |
263 | } |
264 | ||
adcbc688 | 265 | static int gcm_hash_len(struct aead_request *req, u32 flags) |
9382d97a | 266 | { |
adcbc688 | 267 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
268 | struct ahash_request *ahreq = &pctx->u.ahreq; |
269 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
270 | u128 lengths; | |
271 | ||
272 | lengths.a = cpu_to_be64(req->assoclen * 8); | |
273 | lengths.b = cpu_to_be64(gctx->cryptlen * 8); | |
274 | memcpy(pctx->iauth_tag, &lengths, 16); | |
adcbc688 HX |
275 | sg_init_one(&pctx->sg, pctx->iauth_tag, 16); |
276 | ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req); | |
277 | ahash_request_set_crypt(ahreq, &pctx->sg, | |
278 | pctx->iauth_tag, sizeof(lengths)); | |
9382d97a | 279 | |
adcbc688 | 280 | return crypto_ahash_finup(ahreq); |
9382d97a HY |
281 | } |
282 | ||
adcbc688 | 283 | static int gcm_hash_len_continue(struct aead_request *req, u32 flags) |
9382d97a | 284 | { |
2589469d | 285 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
286 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
287 | ||
adcbc688 | 288 | return gctx->complete(req, flags); |
9382d97a HY |
289 | } |
290 | ||
adcbc688 | 291 | static void gcm_hash_len_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
292 | { |
293 | struct aead_request *req = areq->data; | |
62c5593a | 294 | |
adcbc688 HX |
295 | if (err) |
296 | goto out; | |
9382d97a | 297 | |
adcbc688 HX |
298 | err = gcm_hash_len_continue(req, 0); |
299 | if (err == -EINPROGRESS) | |
300 | return; | |
62c5593a | 301 | |
adcbc688 HX |
302 | out: |
303 | aead_request_complete(req, err); | |
62c5593a HY |
304 | } |
305 | ||
adcbc688 | 306 | static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags) |
62c5593a | 307 | { |
adcbc688 HX |
308 | return gcm_hash_len(req, flags) ?: |
309 | gcm_hash_len_continue(req, flags); | |
9382d97a HY |
310 | } |
311 | ||
62c5593a HY |
312 | static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq, |
313 | int err) | |
9382d97a HY |
314 | { |
315 | struct aead_request *req = areq->data; | |
62c5593a | 316 | |
adcbc688 HX |
317 | if (err) |
318 | goto out; | |
319 | ||
320 | err = gcm_hash_crypt_remain_continue(req, 0); | |
321 | if (err == -EINPROGRESS) | |
322 | return; | |
323 | ||
324 | out: | |
325 | aead_request_complete(req, err); | |
62c5593a HY |
326 | } |
327 | ||
adcbc688 | 328 | static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags) |
62c5593a | 329 | { |
9382d97a HY |
330 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
331 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
332 | unsigned int remain; | |
333 | ||
adcbc688 HX |
334 | remain = gcm_remain(gctx->cryptlen); |
335 | if (remain) | |
336 | return gcm_hash_remain(req, remain, | |
337 | gcm_hash_crypt_remain_done, flags) ?: | |
338 | gcm_hash_crypt_remain_continue(req, flags); | |
9382d97a | 339 | |
adcbc688 | 340 | return gcm_hash_crypt_remain_continue(req, flags); |
9382d97a HY |
341 | } |
342 | ||
62c5593a | 343 | static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
344 | { |
345 | struct aead_request *req = areq->data; | |
62c5593a | 346 | |
adcbc688 HX |
347 | if (err) |
348 | goto out; | |
349 | ||
350 | err = gcm_hash_crypt_continue(req, 0); | |
351 | if (err == -EINPROGRESS) | |
352 | return; | |
353 | ||
354 | out: | |
355 | aead_request_complete(req, err); | |
62c5593a HY |
356 | } |
357 | ||
adcbc688 | 358 | static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags) |
62c5593a | 359 | { |
9382d97a HY |
360 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
361 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
9382d97a | 362 | |
adcbc688 HX |
363 | if (gctx->cryptlen) |
364 | return gcm_hash_update(req, gcm_hash_crypt_done, | |
365 | gctx->src, gctx->cryptlen, flags) ?: | |
366 | gcm_hash_crypt_continue(req, flags); | |
367 | ||
368 | return gcm_hash_crypt_remain_continue(req, flags); | |
9382d97a HY |
369 | } |
370 | ||
62c5593a HY |
371 | static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq, |
372 | int err) | |
9382d97a HY |
373 | { |
374 | struct aead_request *req = areq->data; | |
62c5593a | 375 | |
adcbc688 HX |
376 | if (err) |
377 | goto out; | |
378 | ||
379 | err = gcm_hash_assoc_remain_continue(req, 0); | |
380 | if (err == -EINPROGRESS) | |
381 | return; | |
382 | ||
383 | out: | |
384 | aead_request_complete(req, err); | |
62c5593a HY |
385 | } |
386 | ||
adcbc688 | 387 | static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags) |
62c5593a | 388 | { |
9382d97a HY |
389 | unsigned int remain; |
390 | ||
adcbc688 HX |
391 | remain = gcm_remain(req->assoclen); |
392 | if (remain) | |
393 | return gcm_hash_remain(req, remain, | |
394 | gcm_hash_assoc_remain_done, flags) ?: | |
395 | gcm_hash_assoc_remain_continue(req, flags); | |
9382d97a | 396 | |
adcbc688 | 397 | return gcm_hash_assoc_remain_continue(req, flags); |
9382d97a HY |
398 | } |
399 | ||
62c5593a | 400 | static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
401 | { |
402 | struct aead_request *req = areq->data; | |
62c5593a | 403 | |
adcbc688 HX |
404 | if (err) |
405 | goto out; | |
406 | ||
407 | err = gcm_hash_assoc_continue(req, 0); | |
408 | if (err == -EINPROGRESS) | |
409 | return; | |
410 | ||
411 | out: | |
412 | aead_request_complete(req, err); | |
62c5593a HY |
413 | } |
414 | ||
adcbc688 | 415 | static int gcm_hash_init_continue(struct aead_request *req, u32 flags) |
62c5593a | 416 | { |
adcbc688 HX |
417 | if (req->assoclen) |
418 | return gcm_hash_update(req, gcm_hash_assoc_done, | |
419 | req->src, req->assoclen, flags) ?: | |
420 | gcm_hash_assoc_continue(req, flags); | |
9382d97a | 421 | |
adcbc688 | 422 | return gcm_hash_assoc_remain_continue(req, flags); |
62c5593a HY |
423 | } |
424 | ||
425 | static void gcm_hash_init_done(struct crypto_async_request *areq, int err) | |
426 | { | |
427 | struct aead_request *req = areq->data; | |
428 | ||
adcbc688 HX |
429 | if (err) |
430 | goto out; | |
431 | ||
432 | err = gcm_hash_init_continue(req, 0); | |
433 | if (err == -EINPROGRESS) | |
434 | return; | |
435 | ||
436 | out: | |
437 | aead_request_complete(req, err); | |
9382d97a HY |
438 | } |
439 | ||
adcbc688 | 440 | static int gcm_hash(struct aead_request *req, u32 flags) |
9382d97a | 441 | { |
adcbc688 | 442 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a | 443 | struct ahash_request *ahreq = &pctx->u.ahreq; |
adcbc688 | 444 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
9382d97a HY |
445 | |
446 | ahash_request_set_tfm(ahreq, ctx->ghash); | |
447 | ||
adcbc688 HX |
448 | ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req); |
449 | return crypto_ahash_init(ahreq) ?: | |
450 | gcm_hash_init_continue(req, flags); | |
9382d97a HY |
451 | } |
452 | ||
adcbc688 | 453 | static int gcm_enc_copy_hash(struct aead_request *req, u32 flags) |
9382d97a | 454 | { |
adcbc688 | 455 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
456 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
457 | u8 *auth_tag = pctx->auth_tag; | |
28db8e3e | 458 | |
adcbc688 HX |
459 | crypto_xor(auth_tag, pctx->iauth_tag, 16); |
460 | scatterwalk_map_and_copy(auth_tag, req->dst, | |
461 | req->assoclen + req->cryptlen, | |
6160b289 | 462 | crypto_aead_authsize(aead), 1); |
adcbc688 | 463 | return 0; |
6160b289 HX |
464 | } |
465 | ||
adcbc688 | 466 | static int gcm_encrypt_continue(struct aead_request *req, u32 flags) |
6160b289 | 467 | { |
9382d97a | 468 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
adcbc688 | 469 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
6160b289 | 470 | |
adcbc688 HX |
471 | gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst); |
472 | gctx->cryptlen = req->cryptlen; | |
473 | gctx->complete = gcm_enc_copy_hash; | |
6160b289 | 474 | |
adcbc688 | 475 | return gcm_hash(req, flags); |
28db8e3e MH |
476 | } |
477 | ||
62c5593a | 478 | static void gcm_encrypt_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
479 | { |
480 | struct aead_request *req = areq->data; | |
9382d97a | 481 | |
adcbc688 HX |
482 | if (err) |
483 | goto out; | |
484 | ||
485 | err = gcm_encrypt_continue(req, 0); | |
486 | if (err == -EINPROGRESS) | |
487 | return; | |
9382d97a | 488 | |
adcbc688 | 489 | out: |
62c5593a | 490 | aead_request_complete(req, err); |
9382d97a HY |
491 | } |
492 | ||
28db8e3e MH |
493 | static int crypto_gcm_encrypt(struct aead_request *req) |
494 | { | |
2589469d | 495 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
16f37ecd | 496 | struct skcipher_request *skreq = &pctx->u.skreq; |
adcbc688 | 497 | u32 flags = aead_request_flags(req); |
9382d97a | 498 | |
adcbc688 HX |
499 | crypto_gcm_init_common(req); |
500 | crypto_gcm_init_crypt(req, req->cryptlen); | |
16f37ecd | 501 | skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req); |
9382d97a | 502 | |
16f37ecd | 503 | return crypto_skcipher_encrypt(skreq) ?: |
adcbc688 | 504 | gcm_encrypt_continue(req, flags); |
28db8e3e MH |
505 | } |
506 | ||
adcbc688 | 507 | static int crypto_gcm_verify(struct aead_request *req) |
84c91152 | 508 | { |
adcbc688 | 509 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
84c91152 | 510 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
84c91152 HX |
511 | u8 *auth_tag = pctx->auth_tag; |
512 | u8 *iauth_tag = pctx->iauth_tag; | |
513 | unsigned int authsize = crypto_aead_authsize(aead); | |
514 | unsigned int cryptlen = req->cryptlen - authsize; | |
515 | ||
9382d97a | 516 | crypto_xor(auth_tag, iauth_tag, 16); |
adcbc688 HX |
517 | scatterwalk_map_and_copy(iauth_tag, req->src, |
518 | req->assoclen + cryptlen, authsize, 0); | |
6bf37e5a | 519 | return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0; |
84c91152 HX |
520 | } |
521 | ||
9382d97a | 522 | static void gcm_decrypt_done(struct crypto_async_request *areq, int err) |
28db8e3e | 523 | { |
84c91152 HX |
524 | struct aead_request *req = areq->data; |
525 | ||
526 | if (!err) | |
adcbc688 | 527 | err = crypto_gcm_verify(req); |
84c91152 HX |
528 | |
529 | aead_request_complete(req, err); | |
28db8e3e MH |
530 | } |
531 | ||
adcbc688 | 532 | static int gcm_dec_hash_continue(struct aead_request *req, u32 flags) |
9382d97a | 533 | { |
9382d97a | 534 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
16f37ecd | 535 | struct skcipher_request *skreq = &pctx->u.skreq; |
9382d97a HY |
536 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
537 | ||
adcbc688 | 538 | crypto_gcm_init_crypt(req, gctx->cryptlen); |
16f37ecd HX |
539 | skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req); |
540 | return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req); | |
9382d97a HY |
541 | } |
542 | ||
28db8e3e MH |
543 | static int crypto_gcm_decrypt(struct aead_request *req) |
544 | { | |
6160b289 | 545 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
2589469d | 546 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a | 547 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
6160b289 | 548 | unsigned int authsize = crypto_aead_authsize(aead); |
9382d97a | 549 | unsigned int cryptlen = req->cryptlen; |
adcbc688 | 550 | u32 flags = aead_request_flags(req); |
28db8e3e | 551 | |
6160b289 | 552 | cryptlen -= authsize; |
28db8e3e | 553 | |
adcbc688 | 554 | crypto_gcm_init_common(req); |
28db8e3e | 555 | |
adcbc688 HX |
556 | gctx->src = sg_next(pctx->src); |
557 | gctx->cryptlen = cryptlen; | |
558 | gctx->complete = gcm_dec_hash_continue; | |
28db8e3e | 559 | |
adcbc688 | 560 | return gcm_hash(req, flags); |
28db8e3e MH |
561 | } |
562 | ||
adcbc688 | 563 | static int crypto_gcm_init_tfm(struct crypto_aead *tfm) |
28db8e3e | 564 | { |
adcbc688 HX |
565 | struct aead_instance *inst = aead_alg_instance(tfm); |
566 | struct gcm_instance_ctx *ictx = aead_instance_ctx(inst); | |
567 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm); | |
16f37ecd | 568 | struct crypto_skcipher *ctr; |
9382d97a | 569 | struct crypto_ahash *ghash; |
28db8e3e MH |
570 | unsigned long align; |
571 | int err; | |
572 | ||
9382d97a HY |
573 | ghash = crypto_spawn_ahash(&ictx->ghash); |
574 | if (IS_ERR(ghash)) | |
575 | return PTR_ERR(ghash); | |
576 | ||
60425a8b | 577 | ctr = crypto_spawn_skcipher(&ictx->ctr); |
28db8e3e MH |
578 | err = PTR_ERR(ctr); |
579 | if (IS_ERR(ctr)) | |
9382d97a | 580 | goto err_free_hash; |
28db8e3e MH |
581 | |
582 | ctx->ctr = ctr; | |
9382d97a | 583 | ctx->ghash = ghash; |
28db8e3e | 584 | |
adcbc688 | 585 | align = crypto_aead_alignmask(tfm); |
28db8e3e | 586 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
adcbc688 | 587 | crypto_aead_set_reqsize(tfm, |
5d72336f | 588 | align + offsetof(struct crypto_gcm_req_priv_ctx, u) + |
16f37ecd HX |
589 | max(sizeof(struct skcipher_request) + |
590 | crypto_skcipher_reqsize(ctr), | |
9382d97a | 591 | sizeof(struct ahash_request) + |
5d72336f | 592 | crypto_ahash_reqsize(ghash))); |
28db8e3e MH |
593 | |
594 | return 0; | |
9382d97a HY |
595 | |
596 | err_free_hash: | |
597 | crypto_free_ahash(ghash); | |
598 | return err; | |
28db8e3e MH |
599 | } |
600 | ||
adcbc688 | 601 | static void crypto_gcm_exit_tfm(struct crypto_aead *tfm) |
28db8e3e | 602 | { |
adcbc688 | 603 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm); |
28db8e3e | 604 | |
9382d97a | 605 | crypto_free_ahash(ctx->ghash); |
16f37ecd | 606 | crypto_free_skcipher(ctx->ctr); |
28db8e3e MH |
607 | } |
608 | ||
7b05a373 HX |
609 | static void crypto_gcm_free(struct aead_instance *inst) |
610 | { | |
611 | struct gcm_instance_ctx *ctx = aead_instance_ctx(inst); | |
612 | ||
613 | crypto_drop_skcipher(&ctx->ctr); | |
614 | crypto_drop_ahash(&ctx->ghash); | |
615 | kfree(inst); | |
616 | } | |
617 | ||
adcbc688 HX |
618 | static int crypto_gcm_create_common(struct crypto_template *tmpl, |
619 | struct rtattr **tb, | |
620 | const char *full_name, | |
621 | const char *ctr_name, | |
622 | const char *ghash_name) | |
28db8e3e | 623 | { |
d00aa19b | 624 | struct crypto_attr_type *algt; |
adcbc688 | 625 | struct aead_instance *inst; |
16f37ecd | 626 | struct skcipher_alg *ctr; |
9382d97a | 627 | struct crypto_alg *ghash_alg; |
adcbc688 | 628 | struct hash_alg_common *ghash; |
28db8e3e MH |
629 | struct gcm_instance_ctx *ctx; |
630 | int err; | |
28db8e3e | 631 | |
d00aa19b | 632 | algt = crypto_get_attr_type(tb); |
d00aa19b | 633 | if (IS_ERR(algt)) |
adcbc688 | 634 | return PTR_ERR(algt); |
28db8e3e | 635 | |
5e4b8c1f | 636 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
adcbc688 | 637 | return -EINVAL; |
28db8e3e | 638 | |
9382d97a HY |
639 | ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type, |
640 | CRYPTO_ALG_TYPE_HASH, | |
b30bdfa8 HX |
641 | CRYPTO_ALG_TYPE_AHASH_MASK | |
642 | crypto_requires_sync(algt->type, | |
643 | algt->mask)); | |
9382d97a | 644 | if (IS_ERR(ghash_alg)) |
adcbc688 HX |
645 | return PTR_ERR(ghash_alg); |
646 | ||
647 | ghash = __crypto_hash_alg_common(ghash_alg); | |
9382d97a HY |
648 | |
649 | err = -ENOMEM; | |
1472e5eb HX |
650 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
651 | if (!inst) | |
9382d97a | 652 | goto out_put_ghash; |
28db8e3e | 653 | |
adcbc688 HX |
654 | ctx = aead_instance_ctx(inst); |
655 | err = crypto_init_ahash_spawn(&ctx->ghash, ghash, | |
656 | aead_crypto_instance(inst)); | |
9382d97a HY |
657 | if (err) |
658 | goto err_free_inst; | |
659 | ||
adcbc688 HX |
660 | err = -EINVAL; |
661 | if (ghash->digestsize != 16) | |
662 | goto err_drop_ghash; | |
663 | ||
664 | crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst)); | |
a35528ec EB |
665 | err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0, |
666 | crypto_requires_sync(algt->type, | |
667 | algt->mask)); | |
1472e5eb | 668 | if (err) |
9382d97a | 669 | goto err_drop_ghash; |
1472e5eb | 670 | |
16f37ecd | 671 | ctr = crypto_spawn_skcipher_alg(&ctx->ctr); |
28db8e3e | 672 | |
d00aa19b | 673 | /* We only support 16-byte blocks. */ |
9b40f79c | 674 | err = -EINVAL; |
16f37ecd | 675 | if (crypto_skcipher_alg_ivsize(ctr) != 16) |
d00aa19b HX |
676 | goto out_put_ctr; |
677 | ||
678 | /* Not a stream cipher? */ | |
16f37ecd | 679 | if (ctr->base.cra_blocksize != 1) |
28db8e3e MH |
680 | goto out_put_ctr; |
681 | ||
28db8e3e | 682 | err = -ENAMETOOLONG; |
adcbc688 | 683 | if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
16f37ecd | 684 | "gcm_base(%s,%s)", ctr->base.cra_driver_name, |
9382d97a | 685 | ghash_alg->cra_driver_name) >= |
d00aa19b | 686 | CRYPTO_MAX_ALG_NAME) |
1472e5eb | 687 | goto out_put_ctr; |
28db8e3e | 688 | |
adcbc688 HX |
689 | memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME); |
690 | ||
16f37ecd HX |
691 | inst->alg.base.cra_flags = (ghash->base.cra_flags | |
692 | ctr->base.cra_flags) & CRYPTO_ALG_ASYNC; | |
adcbc688 | 693 | inst->alg.base.cra_priority = (ghash->base.cra_priority + |
16f37ecd | 694 | ctr->base.cra_priority) / 2; |
adcbc688 HX |
695 | inst->alg.base.cra_blocksize = 1; |
696 | inst->alg.base.cra_alignmask = ghash->base.cra_alignmask | | |
16f37ecd | 697 | ctr->base.cra_alignmask; |
adcbc688 | 698 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx); |
e0ab7e9c | 699 | inst->alg.ivsize = GCM_AES_IV_SIZE; |
16f37ecd | 700 | inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr); |
adcbc688 HX |
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 | ||
e0ab7e9c | 836 | scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0); |
7b05a373 | 837 | |
dadbc53d HX |
838 | memcpy(iv, ctx->nonce, 4); |
839 | memcpy(iv + 4, req->iv, 8); | |
840 | ||
7b05a373 | 841 | sg_init_table(rctx->src, 3); |
e0ab7e9c | 842 | sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8); |
7b05a373 HX |
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); | |
e0ab7e9c | 849 | sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8); |
7b05a373 HX |
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 | 960 | /* Underlying IV size must be 12. */ |
e0ab7e9c | 961 | if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE) |
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 | |
e0ab7e9c | 984 | inst->alg.ivsize = GCM_RFC4106_IV_SIZE; |
16f37ecd | 985 | inst->alg.chunksize = crypto_aead_alg_chunksize(alg); |
adcbc688 | 986 | inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); |
dadbc53d | 987 | |
adcbc688 HX |
988 | inst->alg.init = crypto_rfc4106_init_tfm; |
989 | inst->alg.exit = crypto_rfc4106_exit_tfm; | |
dadbc53d | 990 | |
adcbc688 HX |
991 | inst->alg.setkey = crypto_rfc4106_setkey; |
992 | inst->alg.setauthsize = crypto_rfc4106_setauthsize; | |
993 | inst->alg.encrypt = crypto_rfc4106_encrypt; | |
994 | inst->alg.decrypt = crypto_rfc4106_decrypt; | |
dadbc53d | 995 | |
7b05a373 HX |
996 | inst->free = crypto_rfc4106_free; |
997 | ||
adcbc688 HX |
998 | err = aead_register_instance(tmpl, inst); |
999 | if (err) | |
1000 | goto out_drop_alg; | |
dadbc53d HX |
1001 | |
1002 | out: | |
adcbc688 | 1003 | return err; |
dadbc53d HX |
1004 | |
1005 | out_drop_alg: | |
1006 | crypto_drop_aead(spawn); | |
1007 | out_free_inst: | |
1008 | kfree(inst); | |
dadbc53d HX |
1009 | goto out; |
1010 | } | |
1011 | ||
dadbc53d HX |
1012 | static struct crypto_template crypto_rfc4106_tmpl = { |
1013 | .name = "rfc4106", | |
adcbc688 | 1014 | .create = crypto_rfc4106_create, |
dadbc53d HX |
1015 | .module = THIS_MODULE, |
1016 | }; | |
1017 | ||
73c89c15 TB |
1018 | static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key, |
1019 | unsigned int keylen) | |
1020 | { | |
1021 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent); | |
1022 | struct crypto_aead *child = ctx->child; | |
1023 | int err; | |
1024 | ||
1025 | if (keylen < 4) | |
1026 | return -EINVAL; | |
1027 | ||
1028 | keylen -= 4; | |
1029 | memcpy(ctx->nonce, key + keylen, 4); | |
1030 | ||
1031 | crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
1032 | crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & | |
1033 | CRYPTO_TFM_REQ_MASK); | |
1034 | err = crypto_aead_setkey(child, key, keylen); | |
1035 | crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & | |
1036 | CRYPTO_TFM_RES_MASK); | |
1037 | ||
1038 | return err; | |
1039 | } | |
1040 | ||
1041 | static int crypto_rfc4543_setauthsize(struct crypto_aead *parent, | |
1042 | unsigned int authsize) | |
1043 | { | |
1044 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent); | |
1045 | ||
1046 | if (authsize != 16) | |
1047 | return -EINVAL; | |
1048 | ||
1049 | return crypto_aead_setauthsize(ctx->child, authsize); | |
1050 | } | |
1051 | ||
adcbc688 | 1052 | static int crypto_rfc4543_crypt(struct aead_request *req, bool enc) |
73c89c15 TB |
1053 | { |
1054 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
1055 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead); | |
adcbc688 | 1056 | struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req); |
73c89c15 | 1057 | struct aead_request *subreq = &rctx->subreq; |
73c89c15 | 1058 | unsigned int authsize = crypto_aead_authsize(aead); |
73c89c15 TB |
1059 | u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child), |
1060 | crypto_aead_alignmask(ctx->child) + 1); | |
adcbc688 HX |
1061 | int err; |
1062 | ||
1063 | if (req->src != req->dst) { | |
1064 | err = crypto_rfc4543_copy_src_to_dst(req, enc); | |
1065 | if (err) | |
1066 | return err; | |
1067 | } | |
73c89c15 TB |
1068 | |
1069 | memcpy(iv, ctx->nonce, 4); | |
1070 | memcpy(iv + 4, req->iv, 8); | |
1071 | ||
73c89c15 | 1072 | aead_request_set_tfm(subreq, ctx->child); |
adcbc688 HX |
1073 | aead_request_set_callback(subreq, req->base.flags, |
1074 | req->base.complete, req->base.data); | |
1075 | aead_request_set_crypt(subreq, req->src, req->dst, | |
1076 | enc ? 0 : authsize, iv); | |
1077 | aead_request_set_ad(subreq, req->assoclen + req->cryptlen - | |
1078 | subreq->cryptlen); | |
1079 | ||
1080 | return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq); | |
73c89c15 TB |
1081 | } |
1082 | ||
9489667d JK |
1083 | static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc) |
1084 | { | |
1085 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
1086 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead); | |
1087 | unsigned int authsize = crypto_aead_authsize(aead); | |
adcbc688 HX |
1088 | unsigned int nbytes = req->assoclen + req->cryptlen - |
1089 | (enc ? 0 : authsize); | |
16f37ecd HX |
1090 | SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null); |
1091 | ||
1092 | skcipher_request_set_tfm(nreq, ctx->null); | |
1093 | skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL); | |
1094 | skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL); | |
9489667d | 1095 | |
16f37ecd | 1096 | return crypto_skcipher_encrypt(nreq); |
9489667d JK |
1097 | } |
1098 | ||
73c89c15 TB |
1099 | static int crypto_rfc4543_encrypt(struct aead_request *req) |
1100 | { | |
adcbc688 | 1101 | return crypto_rfc4543_crypt(req, true); |
73c89c15 TB |
1102 | } |
1103 | ||
1104 | static int crypto_rfc4543_decrypt(struct aead_request *req) | |
1105 | { | |
adcbc688 | 1106 | return crypto_rfc4543_crypt(req, false); |
73c89c15 TB |
1107 | } |
1108 | ||
adcbc688 | 1109 | static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm) |
73c89c15 | 1110 | { |
adcbc688 HX |
1111 | struct aead_instance *inst = aead_alg_instance(tfm); |
1112 | struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst); | |
9489667d | 1113 | struct crypto_aead_spawn *spawn = &ictx->aead; |
adcbc688 | 1114 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm); |
73c89c15 | 1115 | struct crypto_aead *aead; |
16f37ecd | 1116 | struct crypto_skcipher *null; |
73c89c15 | 1117 | unsigned long align; |
9489667d | 1118 | int err = 0; |
73c89c15 TB |
1119 | |
1120 | aead = crypto_spawn_aead(spawn); | |
1121 | if (IS_ERR(aead)) | |
1122 | return PTR_ERR(aead); | |
1123 | ||
16f37ecd | 1124 | null = crypto_get_default_null_skcipher2(); |
9489667d JK |
1125 | err = PTR_ERR(null); |
1126 | if (IS_ERR(null)) | |
1127 | goto err_free_aead; | |
1128 | ||
73c89c15 | 1129 | ctx->child = aead; |
9489667d | 1130 | ctx->null = null; |
73c89c15 TB |
1131 | |
1132 | align = crypto_aead_alignmask(aead); | |
1133 | align &= ~(crypto_tfm_ctx_alignment() - 1); | |
adcbc688 HX |
1134 | crypto_aead_set_reqsize( |
1135 | tfm, | |
5d72336f HX |
1136 | sizeof(struct crypto_rfc4543_req_ctx) + |
1137 | ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + | |
e0ab7e9c | 1138 | align + GCM_AES_IV_SIZE); |
73c89c15 TB |
1139 | |
1140 | return 0; | |
9489667d JK |
1141 | |
1142 | err_free_aead: | |
1143 | crypto_free_aead(aead); | |
1144 | return err; | |
73c89c15 TB |
1145 | } |
1146 | ||
adcbc688 | 1147 | static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm) |
73c89c15 | 1148 | { |
adcbc688 | 1149 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm); |
73c89c15 TB |
1150 | |
1151 | crypto_free_aead(ctx->child); | |
16f37ecd | 1152 | crypto_put_default_null_skcipher2(); |
73c89c15 TB |
1153 | } |
1154 | ||
7b05a373 HX |
1155 | static void crypto_rfc4543_free(struct aead_instance *inst) |
1156 | { | |
1157 | struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst); | |
1158 | ||
1159 | crypto_drop_aead(&ctx->aead); | |
1160 | ||
1161 | kfree(inst); | |
1162 | } | |
1163 | ||
adcbc688 HX |
1164 | static int crypto_rfc4543_create(struct crypto_template *tmpl, |
1165 | struct rtattr **tb) | |
73c89c15 TB |
1166 | { |
1167 | struct crypto_attr_type *algt; | |
adcbc688 | 1168 | struct aead_instance *inst; |
73c89c15 | 1169 | struct crypto_aead_spawn *spawn; |
adcbc688 | 1170 | struct aead_alg *alg; |
9489667d | 1171 | struct crypto_rfc4543_instance_ctx *ctx; |
73c89c15 TB |
1172 | const char *ccm_name; |
1173 | int err; | |
1174 | ||
1175 | algt = crypto_get_attr_type(tb); | |
73c89c15 | 1176 | if (IS_ERR(algt)) |
adcbc688 | 1177 | return PTR_ERR(algt); |
73c89c15 | 1178 | |
5e4b8c1f | 1179 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
adcbc688 | 1180 | return -EINVAL; |
73c89c15 TB |
1181 | |
1182 | ccm_name = crypto_attr_alg_name(tb[1]); | |
73c89c15 | 1183 | if (IS_ERR(ccm_name)) |
adcbc688 | 1184 | return PTR_ERR(ccm_name); |
73c89c15 | 1185 | |
9489667d | 1186 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
73c89c15 | 1187 | if (!inst) |
adcbc688 | 1188 | return -ENOMEM; |
73c89c15 | 1189 | |
adcbc688 | 1190 | ctx = aead_instance_ctx(inst); |
9489667d | 1191 | spawn = &ctx->aead; |
adcbc688 | 1192 | crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); |
73c89c15 TB |
1193 | err = crypto_grab_aead(spawn, ccm_name, 0, |
1194 | crypto_requires_sync(algt->type, algt->mask)); | |
1195 | if (err) | |
1196 | goto out_free_inst; | |
1197 | ||
adcbc688 | 1198 | alg = crypto_spawn_aead_alg(spawn); |
73c89c15 TB |
1199 | |
1200 | err = -EINVAL; | |
1201 | ||
adcbc688 | 1202 | /* Underlying IV size must be 12. */ |
e0ab7e9c | 1203 | if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE) |
17db8546 | 1204 | goto out_drop_alg; |
73c89c15 TB |
1205 | |
1206 | /* Not a stream cipher? */ | |
adcbc688 | 1207 | if (alg->base.cra_blocksize != 1) |
17db8546 | 1208 | goto out_drop_alg; |
73c89c15 TB |
1209 | |
1210 | err = -ENAMETOOLONG; | |
adcbc688 HX |
1211 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
1212 | "rfc4543(%s)", alg->base.cra_name) >= | |
1213 | CRYPTO_MAX_ALG_NAME || | |
1214 | snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
1215 | "rfc4543(%s)", alg->base.cra_driver_name) >= | |
73c89c15 | 1216 | CRYPTO_MAX_ALG_NAME) |
17db8546 | 1217 | goto out_drop_alg; |
73c89c15 | 1218 | |
adcbc688 HX |
1219 | inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
1220 | inst->alg.base.cra_priority = alg->base.cra_priority; | |
1221 | inst->alg.base.cra_blocksize = 1; | |
1222 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask; | |
73c89c15 | 1223 | |
adcbc688 | 1224 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx); |
73c89c15 | 1225 | |
e0ab7e9c | 1226 | inst->alg.ivsize = GCM_RFC4543_IV_SIZE; |
16f37ecd | 1227 | inst->alg.chunksize = crypto_aead_alg_chunksize(alg); |
adcbc688 | 1228 | inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); |
73c89c15 | 1229 | |
adcbc688 HX |
1230 | inst->alg.init = crypto_rfc4543_init_tfm; |
1231 | inst->alg.exit = crypto_rfc4543_exit_tfm; | |
73c89c15 | 1232 | |
adcbc688 HX |
1233 | inst->alg.setkey = crypto_rfc4543_setkey; |
1234 | inst->alg.setauthsize = crypto_rfc4543_setauthsize; | |
1235 | inst->alg.encrypt = crypto_rfc4543_encrypt; | |
1236 | inst->alg.decrypt = crypto_rfc4543_decrypt; | |
73c89c15 | 1237 | |
7b05a373 HX |
1238 | inst->free = crypto_rfc4543_free, |
1239 | ||
adcbc688 HX |
1240 | err = aead_register_instance(tmpl, inst); |
1241 | if (err) | |
1242 | goto out_drop_alg; | |
73c89c15 TB |
1243 | |
1244 | out: | |
adcbc688 | 1245 | return err; |
73c89c15 TB |
1246 | |
1247 | out_drop_alg: | |
1248 | crypto_drop_aead(spawn); | |
1249 | out_free_inst: | |
1250 | kfree(inst); | |
73c89c15 TB |
1251 | goto out; |
1252 | } | |
1253 | ||
73c89c15 TB |
1254 | static struct crypto_template crypto_rfc4543_tmpl = { |
1255 | .name = "rfc4543", | |
adcbc688 | 1256 | .create = crypto_rfc4543_create, |
73c89c15 TB |
1257 | .module = THIS_MODULE, |
1258 | }; | |
1259 | ||
28db8e3e MH |
1260 | static int __init crypto_gcm_module_init(void) |
1261 | { | |
d00aa19b HX |
1262 | int err; |
1263 | ||
adcbc688 | 1264 | gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL); |
9382d97a HY |
1265 | if (!gcm_zeroes) |
1266 | return -ENOMEM; | |
1267 | ||
adcbc688 HX |
1268 | sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf)); |
1269 | ||
d00aa19b HX |
1270 | err = crypto_register_template(&crypto_gcm_base_tmpl); |
1271 | if (err) | |
1272 | goto out; | |
1273 | ||
1274 | err = crypto_register_template(&crypto_gcm_tmpl); | |
1275 | if (err) | |
1276 | goto out_undo_base; | |
1277 | ||
dadbc53d HX |
1278 | err = crypto_register_template(&crypto_rfc4106_tmpl); |
1279 | if (err) | |
1280 | goto out_undo_gcm; | |
1281 | ||
73c89c15 TB |
1282 | err = crypto_register_template(&crypto_rfc4543_tmpl); |
1283 | if (err) | |
1284 | goto out_undo_rfc4106; | |
1285 | ||
9382d97a | 1286 | return 0; |
d00aa19b | 1287 | |
73c89c15 TB |
1288 | out_undo_rfc4106: |
1289 | crypto_unregister_template(&crypto_rfc4106_tmpl); | |
dadbc53d HX |
1290 | out_undo_gcm: |
1291 | crypto_unregister_template(&crypto_gcm_tmpl); | |
d00aa19b HX |
1292 | out_undo_base: |
1293 | crypto_unregister_template(&crypto_gcm_base_tmpl); | |
9382d97a HY |
1294 | out: |
1295 | kfree(gcm_zeroes); | |
1296 | return err; | |
28db8e3e MH |
1297 | } |
1298 | ||
1299 | static void __exit crypto_gcm_module_exit(void) | |
1300 | { | |
9382d97a | 1301 | kfree(gcm_zeroes); |
73c89c15 | 1302 | crypto_unregister_template(&crypto_rfc4543_tmpl); |
dadbc53d | 1303 | crypto_unregister_template(&crypto_rfc4106_tmpl); |
28db8e3e | 1304 | crypto_unregister_template(&crypto_gcm_tmpl); |
d00aa19b | 1305 | crypto_unregister_template(&crypto_gcm_base_tmpl); |
28db8e3e MH |
1306 | } |
1307 | ||
1308 | module_init(crypto_gcm_module_init); | |
1309 | module_exit(crypto_gcm_module_exit); | |
1310 | ||
1311 | MODULE_LICENSE("GPL"); | |
1312 | MODULE_DESCRIPTION("Galois/Counter Mode"); | |
1313 | MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>"); | |
5d26a105 KC |
1314 | MODULE_ALIAS_CRYPTO("gcm_base"); |
1315 | MODULE_ALIAS_CRYPTO("rfc4106"); | |
1316 | MODULE_ALIAS_CRYPTO("rfc4543"); | |
4943ba16 | 1317 | MODULE_ALIAS_CRYPTO("gcm"); |