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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 | ||
9489667d JK |
41 | struct crypto_rfc4543_instance_ctx { |
42 | struct crypto_aead_spawn aead; | |
9489667d JK |
43 | }; |
44 | ||
73c89c15 TB |
45 | struct crypto_rfc4543_ctx { |
46 | struct crypto_aead *child; | |
9489667d | 47 | struct crypto_blkcipher *null; |
73c89c15 TB |
48 | u8 nonce[4]; |
49 | }; | |
50 | ||
51 | struct crypto_rfc4543_req_ctx { | |
73c89c15 TB |
52 | struct aead_request subreq; |
53 | }; | |
54 | ||
28db8e3e | 55 | struct crypto_gcm_ghash_ctx { |
9382d97a HY |
56 | unsigned int cryptlen; |
57 | struct scatterlist *src; | |
adcbc688 | 58 | int (*complete)(struct aead_request *req, u32 flags); |
28db8e3e MH |
59 | }; |
60 | ||
61 | struct crypto_gcm_req_priv_ctx { | |
adcbc688 | 62 | u8 iv[16]; |
28db8e3e | 63 | u8 auth_tag[16]; |
6160b289 | 64 | u8 iauth_tag[16]; |
adcbc688 HX |
65 | struct scatterlist src[3]; |
66 | struct scatterlist dst[3]; | |
67 | struct scatterlist sg; | |
9382d97a HY |
68 | struct crypto_gcm_ghash_ctx ghash_ctx; |
69 | union { | |
70 | struct ahash_request ahreq; | |
71 | struct ablkcipher_request abreq; | |
72 | } u; | |
28db8e3e MH |
73 | }; |
74 | ||
84c91152 HX |
75 | struct crypto_gcm_setkey_result { |
76 | int err; | |
77 | struct completion completion; | |
78 | }; | |
79 | ||
adcbc688 HX |
80 | static struct { |
81 | u8 buf[16]; | |
82 | struct scatterlist sg; | |
83 | } *gcm_zeroes; | |
84 | ||
85 | static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc); | |
9382d97a | 86 | |
2589469d HX |
87 | static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx( |
88 | struct aead_request *req) | |
89 | { | |
90 | unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); | |
91 | ||
92 | return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); | |
93 | } | |
94 | ||
84c91152 | 95 | static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err) |
28db8e3e | 96 | { |
84c91152 | 97 | struct crypto_gcm_setkey_result *result = req->data; |
28db8e3e | 98 | |
84c91152 HX |
99 | if (err == -EINPROGRESS) |
100 | return; | |
101 | ||
102 | result->err = err; | |
103 | complete(&result->completion); | |
28db8e3e MH |
104 | } |
105 | ||
106 | static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key, | |
107 | unsigned int keylen) | |
108 | { | |
109 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); | |
9382d97a | 110 | struct crypto_ahash *ghash = ctx->ghash; |
28db8e3e | 111 | struct crypto_ablkcipher *ctr = ctx->ctr; |
84c91152 HX |
112 | struct { |
113 | be128 hash; | |
114 | u8 iv[8]; | |
115 | ||
116 | struct crypto_gcm_setkey_result result; | |
117 | ||
118 | struct scatterlist sg[1]; | |
119 | struct ablkcipher_request req; | |
120 | } *data; | |
121 | int err; | |
28db8e3e MH |
122 | |
123 | crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK); | |
124 | crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) & | |
adcbc688 | 125 | CRYPTO_TFM_REQ_MASK); |
28db8e3e | 126 | err = crypto_ablkcipher_setkey(ctr, key, keylen); |
adcbc688 HX |
127 | crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) & |
128 | CRYPTO_TFM_RES_MASK); | |
28db8e3e | 129 | if (err) |
84c91152 | 130 | return err; |
28db8e3e | 131 | |
84c91152 HX |
132 | data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr), |
133 | GFP_KERNEL); | |
134 | if (!data) | |
135 | return -ENOMEM; | |
136 | ||
137 | init_completion(&data->result.completion); | |
138 | sg_init_one(data->sg, &data->hash, sizeof(data->hash)); | |
139 | ablkcipher_request_set_tfm(&data->req, ctr); | |
140 | ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP | | |
141 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
142 | crypto_gcm_setkey_done, | |
143 | &data->result); | |
144 | ablkcipher_request_set_crypt(&data->req, data->sg, data->sg, | |
145 | sizeof(data->hash), data->iv); | |
146 | ||
147 | err = crypto_ablkcipher_encrypt(&data->req); | |
148 | if (err == -EINPROGRESS || err == -EBUSY) { | |
149 | err = wait_for_completion_interruptible( | |
150 | &data->result.completion); | |
151 | if (!err) | |
152 | err = data->result.err; | |
153 | } | |
154 | ||
28db8e3e MH |
155 | if (err) |
156 | goto out; | |
157 | ||
9382d97a HY |
158 | crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK); |
159 | crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) & | |
160 | CRYPTO_TFM_REQ_MASK); | |
161 | err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128)); | |
162 | crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) & | |
163 | CRYPTO_TFM_RES_MASK); | |
28db8e3e | 164 | |
84c91152 | 165 | out: |
adcbc688 | 166 | kzfree(data); |
28db8e3e MH |
167 | return err; |
168 | } | |
169 | ||
dadbc53d HX |
170 | static int crypto_gcm_setauthsize(struct crypto_aead *tfm, |
171 | unsigned int authsize) | |
172 | { | |
173 | switch (authsize) { | |
174 | case 4: | |
175 | case 8: | |
176 | case 12: | |
177 | case 13: | |
178 | case 14: | |
179 | case 15: | |
180 | case 16: | |
181 | break; | |
182 | default: | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
adcbc688 | 189 | static void crypto_gcm_init_common(struct aead_request *req) |
28db8e3e | 190 | { |
2589469d | 191 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
84c91152 | 192 | __be32 counter = cpu_to_be32(1); |
adcbc688 | 193 | struct scatterlist *sg; |
84c91152 HX |
194 | |
195 | memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag)); | |
adcbc688 HX |
196 | memcpy(pctx->iv, req->iv, 12); |
197 | memcpy(pctx->iv + 12, &counter, 4); | |
84c91152 | 198 | |
adcbc688 | 199 | sg_init_table(pctx->src, 3); |
84c91152 | 200 | sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag)); |
adcbc688 HX |
201 | sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen); |
202 | if (sg != pctx->src + 1) | |
203 | scatterwalk_sg_chain(pctx->src, 2, sg); | |
84c91152 | 204 | |
84c91152 | 205 | if (req->src != req->dst) { |
adcbc688 | 206 | sg_init_table(pctx->dst, 3); |
84c91152 | 207 | sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag)); |
adcbc688 HX |
208 | sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen); |
209 | if (sg != pctx->dst + 1) | |
210 | scatterwalk_sg_chain(pctx->dst, 2, sg); | |
84c91152 | 211 | } |
adcbc688 HX |
212 | } |
213 | ||
214 | static void crypto_gcm_init_crypt(struct aead_request *req, | |
215 | unsigned int cryptlen) | |
216 | { | |
217 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
218 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); | |
219 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); | |
220 | struct ablkcipher_request *ablk_req = &pctx->u.abreq; | |
221 | struct scatterlist *dst; | |
222 | ||
223 | dst = req->src == req->dst ? pctx->src : pctx->dst; | |
28db8e3e MH |
224 | |
225 | ablkcipher_request_set_tfm(ablk_req, ctx->ctr); | |
84c91152 HX |
226 | ablkcipher_request_set_crypt(ablk_req, pctx->src, dst, |
227 | cryptlen + sizeof(pctx->auth_tag), | |
adcbc688 | 228 | pctx->iv); |
9382d97a HY |
229 | } |
230 | ||
231 | static inline unsigned int gcm_remain(unsigned int len) | |
232 | { | |
233 | len &= 0xfU; | |
234 | return len ? 16 - len : 0; | |
235 | } | |
236 | ||
237 | static void gcm_hash_len_done(struct crypto_async_request *areq, int err); | |
28db8e3e | 238 | |
9382d97a | 239 | static int gcm_hash_update(struct aead_request *req, |
3e3dc25f | 240 | crypto_completion_t compl, |
9382d97a | 241 | struct scatterlist *src, |
adcbc688 | 242 | unsigned int len, u32 flags) |
9382d97a | 243 | { |
adcbc688 | 244 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a | 245 | struct ahash_request *ahreq = &pctx->u.ahreq; |
28db8e3e | 246 | |
adcbc688 | 247 | ahash_request_set_callback(ahreq, flags, compl, req); |
9382d97a HY |
248 | ahash_request_set_crypt(ahreq, src, NULL, len); |
249 | ||
250 | return crypto_ahash_update(ahreq); | |
28db8e3e MH |
251 | } |
252 | ||
9382d97a | 253 | static int gcm_hash_remain(struct aead_request *req, |
9382d97a | 254 | unsigned int remain, |
adcbc688 | 255 | crypto_completion_t compl, u32 flags) |
28db8e3e | 256 | { |
adcbc688 | 257 | return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags); |
9382d97a HY |
258 | } |
259 | ||
adcbc688 | 260 | static int gcm_hash_len(struct aead_request *req, u32 flags) |
9382d97a | 261 | { |
adcbc688 | 262 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
263 | struct ahash_request *ahreq = &pctx->u.ahreq; |
264 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
265 | u128 lengths; | |
266 | ||
267 | lengths.a = cpu_to_be64(req->assoclen * 8); | |
268 | lengths.b = cpu_to_be64(gctx->cryptlen * 8); | |
269 | memcpy(pctx->iauth_tag, &lengths, 16); | |
adcbc688 HX |
270 | sg_init_one(&pctx->sg, pctx->iauth_tag, 16); |
271 | ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req); | |
272 | ahash_request_set_crypt(ahreq, &pctx->sg, | |
273 | pctx->iauth_tag, sizeof(lengths)); | |
9382d97a | 274 | |
adcbc688 | 275 | return crypto_ahash_finup(ahreq); |
9382d97a HY |
276 | } |
277 | ||
adcbc688 | 278 | static int gcm_hash_len_continue(struct aead_request *req, u32 flags) |
9382d97a | 279 | { |
2589469d | 280 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
281 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
282 | ||
adcbc688 | 283 | return gctx->complete(req, flags); |
9382d97a HY |
284 | } |
285 | ||
adcbc688 | 286 | static void gcm_hash_len_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
287 | { |
288 | struct aead_request *req = areq->data; | |
62c5593a | 289 | |
adcbc688 HX |
290 | if (err) |
291 | goto out; | |
9382d97a | 292 | |
adcbc688 HX |
293 | err = gcm_hash_len_continue(req, 0); |
294 | if (err == -EINPROGRESS) | |
295 | return; | |
62c5593a | 296 | |
adcbc688 HX |
297 | out: |
298 | aead_request_complete(req, err); | |
62c5593a HY |
299 | } |
300 | ||
adcbc688 | 301 | static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags) |
62c5593a | 302 | { |
adcbc688 HX |
303 | return gcm_hash_len(req, flags) ?: |
304 | gcm_hash_len_continue(req, flags); | |
9382d97a HY |
305 | } |
306 | ||
62c5593a HY |
307 | static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq, |
308 | int err) | |
9382d97a HY |
309 | { |
310 | struct aead_request *req = areq->data; | |
62c5593a | 311 | |
adcbc688 HX |
312 | if (err) |
313 | goto out; | |
314 | ||
315 | err = gcm_hash_crypt_remain_continue(req, 0); | |
316 | if (err == -EINPROGRESS) | |
317 | return; | |
318 | ||
319 | out: | |
320 | aead_request_complete(req, err); | |
62c5593a HY |
321 | } |
322 | ||
adcbc688 | 323 | static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags) |
62c5593a | 324 | { |
9382d97a HY |
325 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
326 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
327 | unsigned int remain; | |
328 | ||
adcbc688 HX |
329 | remain = gcm_remain(gctx->cryptlen); |
330 | if (remain) | |
331 | return gcm_hash_remain(req, remain, | |
332 | gcm_hash_crypt_remain_done, flags) ?: | |
333 | gcm_hash_crypt_remain_continue(req, flags); | |
9382d97a | 334 | |
adcbc688 | 335 | return gcm_hash_crypt_remain_continue(req, flags); |
9382d97a HY |
336 | } |
337 | ||
62c5593a | 338 | static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
339 | { |
340 | struct aead_request *req = areq->data; | |
62c5593a | 341 | |
adcbc688 HX |
342 | if (err) |
343 | goto out; | |
344 | ||
345 | err = gcm_hash_crypt_continue(req, 0); | |
346 | if (err == -EINPROGRESS) | |
347 | return; | |
348 | ||
349 | out: | |
350 | aead_request_complete(req, err); | |
62c5593a HY |
351 | } |
352 | ||
adcbc688 | 353 | static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags) |
62c5593a | 354 | { |
9382d97a HY |
355 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
356 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
9382d97a | 357 | |
adcbc688 HX |
358 | if (gctx->cryptlen) |
359 | return gcm_hash_update(req, gcm_hash_crypt_done, | |
360 | gctx->src, gctx->cryptlen, flags) ?: | |
361 | gcm_hash_crypt_continue(req, flags); | |
362 | ||
363 | return gcm_hash_crypt_remain_continue(req, flags); | |
9382d97a HY |
364 | } |
365 | ||
62c5593a HY |
366 | static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq, |
367 | int err) | |
9382d97a HY |
368 | { |
369 | struct aead_request *req = areq->data; | |
62c5593a | 370 | |
adcbc688 HX |
371 | if (err) |
372 | goto out; | |
373 | ||
374 | err = gcm_hash_assoc_remain_continue(req, 0); | |
375 | if (err == -EINPROGRESS) | |
376 | return; | |
377 | ||
378 | out: | |
379 | aead_request_complete(req, err); | |
62c5593a HY |
380 | } |
381 | ||
adcbc688 | 382 | static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags) |
62c5593a | 383 | { |
9382d97a HY |
384 | unsigned int remain; |
385 | ||
adcbc688 HX |
386 | remain = gcm_remain(req->assoclen); |
387 | if (remain) | |
388 | return gcm_hash_remain(req, remain, | |
389 | gcm_hash_assoc_remain_done, flags) ?: | |
390 | gcm_hash_assoc_remain_continue(req, flags); | |
9382d97a | 391 | |
adcbc688 | 392 | return gcm_hash_assoc_remain_continue(req, flags); |
9382d97a HY |
393 | } |
394 | ||
62c5593a | 395 | static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
396 | { |
397 | struct aead_request *req = areq->data; | |
62c5593a | 398 | |
adcbc688 HX |
399 | if (err) |
400 | goto out; | |
401 | ||
402 | err = gcm_hash_assoc_continue(req, 0); | |
403 | if (err == -EINPROGRESS) | |
404 | return; | |
405 | ||
406 | out: | |
407 | aead_request_complete(req, err); | |
62c5593a HY |
408 | } |
409 | ||
adcbc688 | 410 | static int gcm_hash_init_continue(struct aead_request *req, u32 flags) |
62c5593a | 411 | { |
adcbc688 HX |
412 | if (req->assoclen) |
413 | return gcm_hash_update(req, gcm_hash_assoc_done, | |
414 | req->src, req->assoclen, flags) ?: | |
415 | gcm_hash_assoc_continue(req, flags); | |
9382d97a | 416 | |
adcbc688 | 417 | return gcm_hash_assoc_remain_continue(req, flags); |
62c5593a HY |
418 | } |
419 | ||
420 | static void gcm_hash_init_done(struct crypto_async_request *areq, int err) | |
421 | { | |
422 | struct aead_request *req = areq->data; | |
423 | ||
adcbc688 HX |
424 | if (err) |
425 | goto out; | |
426 | ||
427 | err = gcm_hash_init_continue(req, 0); | |
428 | if (err == -EINPROGRESS) | |
429 | return; | |
430 | ||
431 | out: | |
432 | aead_request_complete(req, err); | |
9382d97a HY |
433 | } |
434 | ||
adcbc688 | 435 | static int gcm_hash(struct aead_request *req, u32 flags) |
9382d97a | 436 | { |
adcbc688 | 437 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a | 438 | struct ahash_request *ahreq = &pctx->u.ahreq; |
adcbc688 | 439 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
9382d97a HY |
440 | |
441 | ahash_request_set_tfm(ahreq, ctx->ghash); | |
442 | ||
adcbc688 HX |
443 | ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req); |
444 | return crypto_ahash_init(ahreq) ?: | |
445 | gcm_hash_init_continue(req, flags); | |
9382d97a HY |
446 | } |
447 | ||
adcbc688 | 448 | static int gcm_enc_copy_hash(struct aead_request *req, u32 flags) |
9382d97a | 449 | { |
adcbc688 | 450 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a HY |
451 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
452 | u8 *auth_tag = pctx->auth_tag; | |
28db8e3e | 453 | |
adcbc688 HX |
454 | crypto_xor(auth_tag, pctx->iauth_tag, 16); |
455 | scatterwalk_map_and_copy(auth_tag, req->dst, | |
456 | req->assoclen + req->cryptlen, | |
6160b289 | 457 | crypto_aead_authsize(aead), 1); |
adcbc688 | 458 | return 0; |
6160b289 HX |
459 | } |
460 | ||
adcbc688 | 461 | static int gcm_encrypt_continue(struct aead_request *req, u32 flags) |
6160b289 | 462 | { |
9382d97a | 463 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
adcbc688 | 464 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
6160b289 | 465 | |
adcbc688 HX |
466 | gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst); |
467 | gctx->cryptlen = req->cryptlen; | |
468 | gctx->complete = gcm_enc_copy_hash; | |
6160b289 | 469 | |
adcbc688 | 470 | return gcm_hash(req, flags); |
28db8e3e MH |
471 | } |
472 | ||
62c5593a | 473 | static void gcm_encrypt_done(struct crypto_async_request *areq, int err) |
9382d97a HY |
474 | { |
475 | struct aead_request *req = areq->data; | |
9382d97a | 476 | |
adcbc688 HX |
477 | if (err) |
478 | goto out; | |
479 | ||
480 | err = gcm_encrypt_continue(req, 0); | |
481 | if (err == -EINPROGRESS) | |
482 | return; | |
9382d97a | 483 | |
adcbc688 | 484 | out: |
62c5593a | 485 | aead_request_complete(req, err); |
9382d97a HY |
486 | } |
487 | ||
28db8e3e MH |
488 | static int crypto_gcm_encrypt(struct aead_request *req) |
489 | { | |
2589469d | 490 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a | 491 | struct ablkcipher_request *abreq = &pctx->u.abreq; |
adcbc688 | 492 | u32 flags = aead_request_flags(req); |
9382d97a | 493 | |
adcbc688 HX |
494 | crypto_gcm_init_common(req); |
495 | crypto_gcm_init_crypt(req, req->cryptlen); | |
496 | ablkcipher_request_set_callback(abreq, flags, gcm_encrypt_done, req); | |
9382d97a | 497 | |
adcbc688 HX |
498 | return crypto_ablkcipher_encrypt(abreq) ?: |
499 | gcm_encrypt_continue(req, flags); | |
28db8e3e MH |
500 | } |
501 | ||
adcbc688 | 502 | static int crypto_gcm_verify(struct aead_request *req) |
84c91152 | 503 | { |
adcbc688 | 504 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
84c91152 | 505 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
84c91152 HX |
506 | u8 *auth_tag = pctx->auth_tag; |
507 | u8 *iauth_tag = pctx->iauth_tag; | |
508 | unsigned int authsize = crypto_aead_authsize(aead); | |
509 | unsigned int cryptlen = req->cryptlen - authsize; | |
510 | ||
9382d97a | 511 | crypto_xor(auth_tag, iauth_tag, 16); |
adcbc688 HX |
512 | scatterwalk_map_and_copy(iauth_tag, req->src, |
513 | req->assoclen + cryptlen, authsize, 0); | |
6bf37e5a | 514 | return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0; |
84c91152 HX |
515 | } |
516 | ||
9382d97a | 517 | static void gcm_decrypt_done(struct crypto_async_request *areq, int err) |
28db8e3e | 518 | { |
84c91152 HX |
519 | struct aead_request *req = areq->data; |
520 | ||
521 | if (!err) | |
adcbc688 | 522 | err = crypto_gcm_verify(req); |
84c91152 HX |
523 | |
524 | aead_request_complete(req, err); | |
28db8e3e MH |
525 | } |
526 | ||
adcbc688 | 527 | static int gcm_dec_hash_continue(struct aead_request *req, u32 flags) |
9382d97a | 528 | { |
9382d97a HY |
529 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
530 | struct ablkcipher_request *abreq = &pctx->u.abreq; | |
531 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; | |
532 | ||
adcbc688 HX |
533 | crypto_gcm_init_crypt(req, gctx->cryptlen); |
534 | ablkcipher_request_set_callback(abreq, flags, gcm_decrypt_done, req); | |
535 | return crypto_ablkcipher_decrypt(abreq) ?: crypto_gcm_verify(req); | |
9382d97a HY |
536 | } |
537 | ||
28db8e3e MH |
538 | static int crypto_gcm_decrypt(struct aead_request *req) |
539 | { | |
6160b289 | 540 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
2589469d | 541 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
9382d97a | 542 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
6160b289 | 543 | unsigned int authsize = crypto_aead_authsize(aead); |
9382d97a | 544 | unsigned int cryptlen = req->cryptlen; |
adcbc688 | 545 | u32 flags = aead_request_flags(req); |
28db8e3e | 546 | |
6160b289 | 547 | cryptlen -= authsize; |
28db8e3e | 548 | |
adcbc688 | 549 | crypto_gcm_init_common(req); |
28db8e3e | 550 | |
adcbc688 HX |
551 | gctx->src = sg_next(pctx->src); |
552 | gctx->cryptlen = cryptlen; | |
553 | gctx->complete = gcm_dec_hash_continue; | |
28db8e3e | 554 | |
adcbc688 | 555 | return gcm_hash(req, flags); |
28db8e3e MH |
556 | } |
557 | ||
adcbc688 | 558 | static int crypto_gcm_init_tfm(struct crypto_aead *tfm) |
28db8e3e | 559 | { |
adcbc688 HX |
560 | struct aead_instance *inst = aead_alg_instance(tfm); |
561 | struct gcm_instance_ctx *ictx = aead_instance_ctx(inst); | |
562 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm); | |
28db8e3e | 563 | struct crypto_ablkcipher *ctr; |
9382d97a | 564 | struct crypto_ahash *ghash; |
28db8e3e MH |
565 | unsigned long align; |
566 | int err; | |
567 | ||
9382d97a HY |
568 | ghash = crypto_spawn_ahash(&ictx->ghash); |
569 | if (IS_ERR(ghash)) | |
570 | return PTR_ERR(ghash); | |
571 | ||
1472e5eb | 572 | ctr = crypto_spawn_skcipher(&ictx->ctr); |
28db8e3e MH |
573 | err = PTR_ERR(ctr); |
574 | if (IS_ERR(ctr)) | |
9382d97a | 575 | goto err_free_hash; |
28db8e3e MH |
576 | |
577 | ctx->ctr = ctr; | |
9382d97a | 578 | ctx->ghash = ghash; |
28db8e3e | 579 | |
adcbc688 | 580 | align = crypto_aead_alignmask(tfm); |
28db8e3e | 581 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
adcbc688 | 582 | crypto_aead_set_reqsize(tfm, |
5d72336f | 583 | align + offsetof(struct crypto_gcm_req_priv_ctx, u) + |
9382d97a HY |
584 | max(sizeof(struct ablkcipher_request) + |
585 | crypto_ablkcipher_reqsize(ctr), | |
586 | sizeof(struct ahash_request) + | |
5d72336f | 587 | crypto_ahash_reqsize(ghash))); |
28db8e3e MH |
588 | |
589 | return 0; | |
9382d97a HY |
590 | |
591 | err_free_hash: | |
592 | crypto_free_ahash(ghash); | |
593 | return err; | |
28db8e3e MH |
594 | } |
595 | ||
adcbc688 | 596 | static void crypto_gcm_exit_tfm(struct crypto_aead *tfm) |
28db8e3e | 597 | { |
adcbc688 | 598 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm); |
28db8e3e | 599 | |
9382d97a | 600 | crypto_free_ahash(ctx->ghash); |
28db8e3e MH |
601 | crypto_free_ablkcipher(ctx->ctr); |
602 | } | |
603 | ||
adcbc688 HX |
604 | static int crypto_gcm_create_common(struct crypto_template *tmpl, |
605 | struct rtattr **tb, | |
606 | const char *full_name, | |
607 | const char *ctr_name, | |
608 | const char *ghash_name) | |
28db8e3e | 609 | { |
d00aa19b | 610 | struct crypto_attr_type *algt; |
adcbc688 | 611 | struct aead_instance *inst; |
28db8e3e | 612 | struct crypto_alg *ctr; |
9382d97a | 613 | struct crypto_alg *ghash_alg; |
adcbc688 | 614 | struct hash_alg_common *ghash; |
28db8e3e MH |
615 | struct gcm_instance_ctx *ctx; |
616 | int err; | |
28db8e3e | 617 | |
d00aa19b | 618 | algt = crypto_get_attr_type(tb); |
d00aa19b | 619 | if (IS_ERR(algt)) |
adcbc688 | 620 | return PTR_ERR(algt); |
28db8e3e | 621 | |
d00aa19b | 622 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
adcbc688 | 623 | return -EINVAL; |
28db8e3e | 624 | |
9382d97a HY |
625 | ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type, |
626 | CRYPTO_ALG_TYPE_HASH, | |
627 | CRYPTO_ALG_TYPE_AHASH_MASK); | |
9382d97a | 628 | if (IS_ERR(ghash_alg)) |
adcbc688 HX |
629 | return PTR_ERR(ghash_alg); |
630 | ||
631 | ghash = __crypto_hash_alg_common(ghash_alg); | |
9382d97a HY |
632 | |
633 | err = -ENOMEM; | |
1472e5eb HX |
634 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
635 | if (!inst) | |
9382d97a | 636 | goto out_put_ghash; |
28db8e3e | 637 | |
adcbc688 HX |
638 | ctx = aead_instance_ctx(inst); |
639 | err = crypto_init_ahash_spawn(&ctx->ghash, ghash, | |
640 | aead_crypto_instance(inst)); | |
9382d97a HY |
641 | if (err) |
642 | goto err_free_inst; | |
643 | ||
adcbc688 HX |
644 | err = -EINVAL; |
645 | if (ghash->digestsize != 16) | |
646 | goto err_drop_ghash; | |
647 | ||
648 | crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst)); | |
1472e5eb HX |
649 | err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0, |
650 | crypto_requires_sync(algt->type, | |
651 | algt->mask)); | |
652 | if (err) | |
9382d97a | 653 | goto err_drop_ghash; |
1472e5eb HX |
654 | |
655 | ctr = crypto_skcipher_spawn_alg(&ctx->ctr); | |
28db8e3e | 656 | |
d00aa19b | 657 | /* We only support 16-byte blocks. */ |
1472e5eb | 658 | if (ctr->cra_ablkcipher.ivsize != 16) |
d00aa19b HX |
659 | goto out_put_ctr; |
660 | ||
661 | /* Not a stream cipher? */ | |
662 | err = -EINVAL; | |
663 | if (ctr->cra_blocksize != 1) | |
28db8e3e MH |
664 | goto out_put_ctr; |
665 | ||
28db8e3e | 666 | err = -ENAMETOOLONG; |
adcbc688 | 667 | if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
9382d97a HY |
668 | "gcm_base(%s,%s)", ctr->cra_driver_name, |
669 | ghash_alg->cra_driver_name) >= | |
d00aa19b | 670 | CRYPTO_MAX_ALG_NAME) |
1472e5eb | 671 | goto out_put_ctr; |
28db8e3e | 672 | |
adcbc688 HX |
673 | memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME); |
674 | ||
675 | inst->alg.base.cra_flags = (ghash->base.cra_flags | ctr->cra_flags) & | |
676 | CRYPTO_ALG_ASYNC; | |
677 | inst->alg.base.cra_priority = (ghash->base.cra_priority + | |
678 | ctr->cra_priority) / 2; | |
679 | inst->alg.base.cra_blocksize = 1; | |
680 | inst->alg.base.cra_alignmask = ghash->base.cra_alignmask | | |
681 | ctr->cra_alignmask; | |
682 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx); | |
683 | inst->alg.ivsize = 12; | |
684 | inst->alg.maxauthsize = 16; | |
685 | inst->alg.init = crypto_gcm_init_tfm; | |
686 | inst->alg.exit = crypto_gcm_exit_tfm; | |
687 | inst->alg.setkey = crypto_gcm_setkey; | |
688 | inst->alg.setauthsize = crypto_gcm_setauthsize; | |
689 | inst->alg.encrypt = crypto_gcm_encrypt; | |
690 | inst->alg.decrypt = crypto_gcm_decrypt; | |
691 | ||
692 | err = aead_register_instance(tmpl, inst); | |
693 | if (err) | |
694 | goto out_put_ctr; | |
28db8e3e | 695 | |
adcbc688 | 696 | out_put_ghash: |
9382d97a | 697 | crypto_mod_put(ghash_alg); |
adcbc688 | 698 | return err; |
1472e5eb HX |
699 | |
700 | out_put_ctr: | |
701 | crypto_drop_skcipher(&ctx->ctr); | |
9382d97a HY |
702 | err_drop_ghash: |
703 | crypto_drop_ahash(&ctx->ghash); | |
28db8e3e MH |
704 | err_free_inst: |
705 | kfree(inst); | |
adcbc688 | 706 | goto out_put_ghash; |
28db8e3e MH |
707 | } |
708 | ||
adcbc688 | 709 | static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb) |
d00aa19b | 710 | { |
d00aa19b HX |
711 | const char *cipher_name; |
712 | char ctr_name[CRYPTO_MAX_ALG_NAME]; | |
713 | char full_name[CRYPTO_MAX_ALG_NAME]; | |
714 | ||
715 | cipher_name = crypto_attr_alg_name(tb[1]); | |
d00aa19b | 716 | if (IS_ERR(cipher_name)) |
adcbc688 | 717 | return PTR_ERR(cipher_name); |
d00aa19b HX |
718 | |
719 | if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >= | |
720 | CRYPTO_MAX_ALG_NAME) | |
adcbc688 | 721 | return -ENAMETOOLONG; |
d00aa19b HX |
722 | |
723 | if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >= | |
724 | CRYPTO_MAX_ALG_NAME) | |
adcbc688 | 725 | return -ENAMETOOLONG; |
d00aa19b | 726 | |
adcbc688 HX |
727 | return crypto_gcm_create_common(tmpl, tb, full_name, |
728 | ctr_name, "ghash"); | |
d00aa19b HX |
729 | } |
730 | ||
28db8e3e MH |
731 | static void crypto_gcm_free(struct crypto_instance *inst) |
732 | { | |
733 | struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst); | |
734 | ||
1472e5eb | 735 | crypto_drop_skcipher(&ctx->ctr); |
9382d97a | 736 | crypto_drop_ahash(&ctx->ghash); |
adcbc688 | 737 | kfree(aead_instance(inst)); |
28db8e3e MH |
738 | } |
739 | ||
740 | static struct crypto_template crypto_gcm_tmpl = { | |
741 | .name = "gcm", | |
adcbc688 | 742 | .create = crypto_gcm_create, |
28db8e3e MH |
743 | .free = crypto_gcm_free, |
744 | .module = THIS_MODULE, | |
745 | }; | |
746 | ||
adcbc688 HX |
747 | static int crypto_gcm_base_create(struct crypto_template *tmpl, |
748 | struct rtattr **tb) | |
d00aa19b | 749 | { |
d00aa19b | 750 | const char *ctr_name; |
9382d97a | 751 | const char *ghash_name; |
d00aa19b HX |
752 | char full_name[CRYPTO_MAX_ALG_NAME]; |
753 | ||
754 | ctr_name = crypto_attr_alg_name(tb[1]); | |
d00aa19b | 755 | if (IS_ERR(ctr_name)) |
adcbc688 | 756 | return PTR_ERR(ctr_name); |
d00aa19b | 757 | |
9382d97a | 758 | ghash_name = crypto_attr_alg_name(tb[2]); |
9382d97a | 759 | if (IS_ERR(ghash_name)) |
adcbc688 | 760 | return PTR_ERR(ghash_name); |
9382d97a HY |
761 | |
762 | if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)", | |
763 | ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME) | |
adcbc688 | 764 | return -ENAMETOOLONG; |
d00aa19b | 765 | |
adcbc688 HX |
766 | return crypto_gcm_create_common(tmpl, tb, full_name, |
767 | ctr_name, ghash_name); | |
d00aa19b HX |
768 | } |
769 | ||
770 | static struct crypto_template crypto_gcm_base_tmpl = { | |
771 | .name = "gcm_base", | |
adcbc688 | 772 | .create = crypto_gcm_base_create, |
d00aa19b HX |
773 | .free = crypto_gcm_free, |
774 | .module = THIS_MODULE, | |
775 | }; | |
776 | ||
dadbc53d HX |
777 | static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key, |
778 | unsigned int keylen) | |
779 | { | |
780 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); | |
781 | struct crypto_aead *child = ctx->child; | |
782 | int err; | |
783 | ||
784 | if (keylen < 4) | |
785 | return -EINVAL; | |
786 | ||
787 | keylen -= 4; | |
788 | memcpy(ctx->nonce, key + keylen, 4); | |
789 | ||
790 | crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
791 | crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & | |
792 | CRYPTO_TFM_REQ_MASK); | |
793 | err = crypto_aead_setkey(child, key, keylen); | |
794 | crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & | |
795 | CRYPTO_TFM_RES_MASK); | |
796 | ||
797 | return err; | |
798 | } | |
799 | ||
800 | static int crypto_rfc4106_setauthsize(struct crypto_aead *parent, | |
801 | unsigned int authsize) | |
802 | { | |
803 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); | |
804 | ||
805 | switch (authsize) { | |
806 | case 8: | |
807 | case 12: | |
808 | case 16: | |
809 | break; | |
810 | default: | |
811 | return -EINVAL; | |
812 | } | |
813 | ||
814 | return crypto_aead_setauthsize(ctx->child, authsize); | |
815 | } | |
816 | ||
817 | static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req) | |
818 | { | |
819 | struct aead_request *subreq = aead_request_ctx(req); | |
820 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
821 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead); | |
822 | struct crypto_aead *child = ctx->child; | |
823 | u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child), | |
824 | crypto_aead_alignmask(child) + 1); | |
825 | ||
826 | memcpy(iv, ctx->nonce, 4); | |
827 | memcpy(iv + 4, req->iv, 8); | |
828 | ||
829 | aead_request_set_tfm(subreq, child); | |
830 | aead_request_set_callback(subreq, req->base.flags, req->base.complete, | |
831 | req->base.data); | |
832 | aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv); | |
adcbc688 | 833 | aead_request_set_ad(subreq, req->assoclen); |
dadbc53d HX |
834 | |
835 | return subreq; | |
836 | } | |
837 | ||
838 | static int crypto_rfc4106_encrypt(struct aead_request *req) | |
839 | { | |
840 | req = crypto_rfc4106_crypt(req); | |
841 | ||
842 | return crypto_aead_encrypt(req); | |
843 | } | |
844 | ||
845 | static int crypto_rfc4106_decrypt(struct aead_request *req) | |
846 | { | |
847 | req = crypto_rfc4106_crypt(req); | |
848 | ||
849 | return crypto_aead_decrypt(req); | |
850 | } | |
851 | ||
adcbc688 | 852 | static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm) |
dadbc53d | 853 | { |
adcbc688 HX |
854 | struct aead_instance *inst = aead_alg_instance(tfm); |
855 | struct crypto_aead_spawn *spawn = aead_instance_ctx(inst); | |
856 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm); | |
dadbc53d HX |
857 | struct crypto_aead *aead; |
858 | unsigned long align; | |
859 | ||
860 | aead = crypto_spawn_aead(spawn); | |
861 | if (IS_ERR(aead)) | |
862 | return PTR_ERR(aead); | |
863 | ||
864 | ctx->child = aead; | |
865 | ||
866 | align = crypto_aead_alignmask(aead); | |
867 | align &= ~(crypto_tfm_ctx_alignment() - 1); | |
adcbc688 HX |
868 | crypto_aead_set_reqsize( |
869 | tfm, | |
5d72336f HX |
870 | sizeof(struct aead_request) + |
871 | ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + | |
adcbc688 | 872 | align + 12); |
dadbc53d HX |
873 | |
874 | return 0; | |
875 | } | |
876 | ||
adcbc688 | 877 | static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm) |
dadbc53d | 878 | { |
adcbc688 | 879 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm); |
dadbc53d HX |
880 | |
881 | crypto_free_aead(ctx->child); | |
882 | } | |
883 | ||
adcbc688 HX |
884 | static int crypto_rfc4106_create(struct crypto_template *tmpl, |
885 | struct rtattr **tb) | |
dadbc53d HX |
886 | { |
887 | struct crypto_attr_type *algt; | |
adcbc688 | 888 | struct aead_instance *inst; |
dadbc53d | 889 | struct crypto_aead_spawn *spawn; |
adcbc688 | 890 | struct aead_alg *alg; |
dadbc53d HX |
891 | const char *ccm_name; |
892 | int err; | |
893 | ||
894 | algt = crypto_get_attr_type(tb); | |
dadbc53d | 895 | if (IS_ERR(algt)) |
adcbc688 | 896 | return PTR_ERR(algt); |
dadbc53d HX |
897 | |
898 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) | |
adcbc688 | 899 | return -EINVAL; |
dadbc53d HX |
900 | |
901 | ccm_name = crypto_attr_alg_name(tb[1]); | |
dadbc53d | 902 | if (IS_ERR(ccm_name)) |
adcbc688 | 903 | return PTR_ERR(ccm_name); |
dadbc53d HX |
904 | |
905 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
906 | if (!inst) | |
adcbc688 | 907 | return -ENOMEM; |
dadbc53d | 908 | |
adcbc688 HX |
909 | spawn = aead_instance_ctx(inst); |
910 | crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); | |
dadbc53d HX |
911 | err = crypto_grab_aead(spawn, ccm_name, 0, |
912 | crypto_requires_sync(algt->type, algt->mask)); | |
913 | if (err) | |
914 | goto out_free_inst; | |
915 | ||
adcbc688 | 916 | alg = crypto_spawn_aead_alg(spawn); |
dadbc53d HX |
917 | |
918 | err = -EINVAL; | |
919 | ||
adcbc688 HX |
920 | /* Underlying IV size must be 12. */ |
921 | if (crypto_aead_alg_ivsize(alg) != 12) | |
dadbc53d HX |
922 | goto out_drop_alg; |
923 | ||
924 | /* Not a stream cipher? */ | |
adcbc688 | 925 | if (alg->base.cra_blocksize != 1) |
dadbc53d HX |
926 | goto out_drop_alg; |
927 | ||
928 | err = -ENAMETOOLONG; | |
adcbc688 HX |
929 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
930 | "rfc4106(%s)", alg->base.cra_name) >= | |
931 | CRYPTO_MAX_ALG_NAME || | |
932 | snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
933 | "rfc4106(%s)", alg->base.cra_driver_name) >= | |
dadbc53d HX |
934 | CRYPTO_MAX_ALG_NAME) |
935 | goto out_drop_alg; | |
936 | ||
adcbc688 HX |
937 | inst->alg.base.cra_flags |= alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
938 | inst->alg.base.cra_priority = alg->base.cra_priority; | |
939 | inst->alg.base.cra_blocksize = 1; | |
940 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask; | |
dadbc53d | 941 | |
adcbc688 | 942 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx); |
dadbc53d | 943 | |
adcbc688 HX |
944 | inst->alg.ivsize = 8; |
945 | inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); | |
dadbc53d | 946 | |
adcbc688 HX |
947 | inst->alg.init = crypto_rfc4106_init_tfm; |
948 | inst->alg.exit = crypto_rfc4106_exit_tfm; | |
dadbc53d | 949 | |
adcbc688 HX |
950 | inst->alg.setkey = crypto_rfc4106_setkey; |
951 | inst->alg.setauthsize = crypto_rfc4106_setauthsize; | |
952 | inst->alg.encrypt = crypto_rfc4106_encrypt; | |
953 | inst->alg.decrypt = crypto_rfc4106_decrypt; | |
dadbc53d | 954 | |
adcbc688 HX |
955 | err = aead_register_instance(tmpl, inst); |
956 | if (err) | |
957 | goto out_drop_alg; | |
dadbc53d HX |
958 | |
959 | out: | |
adcbc688 | 960 | return err; |
dadbc53d HX |
961 | |
962 | out_drop_alg: | |
963 | crypto_drop_aead(spawn); | |
964 | out_free_inst: | |
965 | kfree(inst); | |
dadbc53d HX |
966 | goto out; |
967 | } | |
968 | ||
969 | static void crypto_rfc4106_free(struct crypto_instance *inst) | |
970 | { | |
adcbc688 HX |
971 | crypto_drop_aead(crypto_instance_ctx(inst)); |
972 | kfree(aead_instance(inst)); | |
dadbc53d HX |
973 | } |
974 | ||
975 | static struct crypto_template crypto_rfc4106_tmpl = { | |
976 | .name = "rfc4106", | |
adcbc688 | 977 | .create = crypto_rfc4106_create, |
dadbc53d HX |
978 | .free = crypto_rfc4106_free, |
979 | .module = THIS_MODULE, | |
980 | }; | |
981 | ||
73c89c15 TB |
982 | static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key, |
983 | unsigned int keylen) | |
984 | { | |
985 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent); | |
986 | struct crypto_aead *child = ctx->child; | |
987 | int err; | |
988 | ||
989 | if (keylen < 4) | |
990 | return -EINVAL; | |
991 | ||
992 | keylen -= 4; | |
993 | memcpy(ctx->nonce, key + keylen, 4); | |
994 | ||
995 | crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
996 | crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & | |
997 | CRYPTO_TFM_REQ_MASK); | |
998 | err = crypto_aead_setkey(child, key, keylen); | |
999 | crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & | |
1000 | CRYPTO_TFM_RES_MASK); | |
1001 | ||
1002 | return err; | |
1003 | } | |
1004 | ||
1005 | static int crypto_rfc4543_setauthsize(struct crypto_aead *parent, | |
1006 | unsigned int authsize) | |
1007 | { | |
1008 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent); | |
1009 | ||
1010 | if (authsize != 16) | |
1011 | return -EINVAL; | |
1012 | ||
1013 | return crypto_aead_setauthsize(ctx->child, authsize); | |
1014 | } | |
1015 | ||
adcbc688 | 1016 | static int crypto_rfc4543_crypt(struct aead_request *req, bool enc) |
73c89c15 TB |
1017 | { |
1018 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
1019 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead); | |
adcbc688 | 1020 | struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req); |
73c89c15 | 1021 | struct aead_request *subreq = &rctx->subreq; |
73c89c15 | 1022 | unsigned int authsize = crypto_aead_authsize(aead); |
73c89c15 TB |
1023 | u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child), |
1024 | crypto_aead_alignmask(ctx->child) + 1); | |
adcbc688 HX |
1025 | int err; |
1026 | ||
1027 | if (req->src != req->dst) { | |
1028 | err = crypto_rfc4543_copy_src_to_dst(req, enc); | |
1029 | if (err) | |
1030 | return err; | |
1031 | } | |
73c89c15 TB |
1032 | |
1033 | memcpy(iv, ctx->nonce, 4); | |
1034 | memcpy(iv + 4, req->iv, 8); | |
1035 | ||
73c89c15 | 1036 | aead_request_set_tfm(subreq, ctx->child); |
adcbc688 HX |
1037 | aead_request_set_callback(subreq, req->base.flags, |
1038 | req->base.complete, req->base.data); | |
1039 | aead_request_set_crypt(subreq, req->src, req->dst, | |
1040 | enc ? 0 : authsize, iv); | |
1041 | aead_request_set_ad(subreq, req->assoclen + req->cryptlen - | |
1042 | subreq->cryptlen); | |
1043 | ||
1044 | return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq); | |
73c89c15 TB |
1045 | } |
1046 | ||
9489667d JK |
1047 | static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc) |
1048 | { | |
1049 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
1050 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead); | |
1051 | unsigned int authsize = crypto_aead_authsize(aead); | |
adcbc688 HX |
1052 | unsigned int nbytes = req->assoclen + req->cryptlen - |
1053 | (enc ? 0 : authsize); | |
9489667d JK |
1054 | struct blkcipher_desc desc = { |
1055 | .tfm = ctx->null, | |
1056 | }; | |
1057 | ||
1058 | return crypto_blkcipher_encrypt(&desc, req->dst, req->src, nbytes); | |
1059 | } | |
1060 | ||
73c89c15 TB |
1061 | static int crypto_rfc4543_encrypt(struct aead_request *req) |
1062 | { | |
adcbc688 | 1063 | return crypto_rfc4543_crypt(req, true); |
73c89c15 TB |
1064 | } |
1065 | ||
1066 | static int crypto_rfc4543_decrypt(struct aead_request *req) | |
1067 | { | |
adcbc688 | 1068 | return crypto_rfc4543_crypt(req, false); |
73c89c15 TB |
1069 | } |
1070 | ||
adcbc688 | 1071 | static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm) |
73c89c15 | 1072 | { |
adcbc688 HX |
1073 | struct aead_instance *inst = aead_alg_instance(tfm); |
1074 | struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst); | |
9489667d | 1075 | struct crypto_aead_spawn *spawn = &ictx->aead; |
adcbc688 | 1076 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm); |
73c89c15 | 1077 | struct crypto_aead *aead; |
9489667d | 1078 | struct crypto_blkcipher *null; |
73c89c15 | 1079 | unsigned long align; |
9489667d | 1080 | int err = 0; |
73c89c15 TB |
1081 | |
1082 | aead = crypto_spawn_aead(spawn); | |
1083 | if (IS_ERR(aead)) | |
1084 | return PTR_ERR(aead); | |
1085 | ||
17db8546 | 1086 | null = crypto_get_default_null_skcipher(); |
9489667d JK |
1087 | err = PTR_ERR(null); |
1088 | if (IS_ERR(null)) | |
1089 | goto err_free_aead; | |
1090 | ||
73c89c15 | 1091 | ctx->child = aead; |
9489667d | 1092 | ctx->null = null; |
73c89c15 TB |
1093 | |
1094 | align = crypto_aead_alignmask(aead); | |
1095 | align &= ~(crypto_tfm_ctx_alignment() - 1); | |
adcbc688 HX |
1096 | crypto_aead_set_reqsize( |
1097 | tfm, | |
5d72336f HX |
1098 | sizeof(struct crypto_rfc4543_req_ctx) + |
1099 | ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + | |
adcbc688 | 1100 | align + 12); |
73c89c15 TB |
1101 | |
1102 | return 0; | |
9489667d JK |
1103 | |
1104 | err_free_aead: | |
1105 | crypto_free_aead(aead); | |
1106 | return err; | |
73c89c15 TB |
1107 | } |
1108 | ||
adcbc688 | 1109 | static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm) |
73c89c15 | 1110 | { |
adcbc688 | 1111 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm); |
73c89c15 TB |
1112 | |
1113 | crypto_free_aead(ctx->child); | |
17db8546 | 1114 | crypto_put_default_null_skcipher(); |
73c89c15 TB |
1115 | } |
1116 | ||
adcbc688 HX |
1117 | static int crypto_rfc4543_create(struct crypto_template *tmpl, |
1118 | struct rtattr **tb) | |
73c89c15 TB |
1119 | { |
1120 | struct crypto_attr_type *algt; | |
adcbc688 | 1121 | struct aead_instance *inst; |
73c89c15 | 1122 | struct crypto_aead_spawn *spawn; |
adcbc688 | 1123 | struct aead_alg *alg; |
9489667d | 1124 | struct crypto_rfc4543_instance_ctx *ctx; |
73c89c15 TB |
1125 | const char *ccm_name; |
1126 | int err; | |
1127 | ||
1128 | algt = crypto_get_attr_type(tb); | |
73c89c15 | 1129 | if (IS_ERR(algt)) |
adcbc688 | 1130 | return PTR_ERR(algt); |
73c89c15 TB |
1131 | |
1132 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) | |
adcbc688 | 1133 | return -EINVAL; |
73c89c15 TB |
1134 | |
1135 | ccm_name = crypto_attr_alg_name(tb[1]); | |
73c89c15 | 1136 | if (IS_ERR(ccm_name)) |
adcbc688 | 1137 | return PTR_ERR(ccm_name); |
73c89c15 | 1138 | |
9489667d | 1139 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
73c89c15 | 1140 | if (!inst) |
adcbc688 | 1141 | return -ENOMEM; |
73c89c15 | 1142 | |
adcbc688 | 1143 | ctx = aead_instance_ctx(inst); |
9489667d | 1144 | spawn = &ctx->aead; |
adcbc688 | 1145 | crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); |
73c89c15 TB |
1146 | err = crypto_grab_aead(spawn, ccm_name, 0, |
1147 | crypto_requires_sync(algt->type, algt->mask)); | |
1148 | if (err) | |
1149 | goto out_free_inst; | |
1150 | ||
adcbc688 | 1151 | alg = crypto_spawn_aead_alg(spawn); |
73c89c15 TB |
1152 | |
1153 | err = -EINVAL; | |
1154 | ||
adcbc688 HX |
1155 | /* Underlying IV size must be 12. */ |
1156 | if (crypto_aead_alg_ivsize(alg) != 12) | |
17db8546 | 1157 | goto out_drop_alg; |
73c89c15 TB |
1158 | |
1159 | /* Not a stream cipher? */ | |
adcbc688 | 1160 | if (alg->base.cra_blocksize != 1) |
17db8546 | 1161 | goto out_drop_alg; |
73c89c15 TB |
1162 | |
1163 | err = -ENAMETOOLONG; | |
adcbc688 HX |
1164 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
1165 | "rfc4543(%s)", alg->base.cra_name) >= | |
1166 | CRYPTO_MAX_ALG_NAME || | |
1167 | snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
1168 | "rfc4543(%s)", alg->base.cra_driver_name) >= | |
73c89c15 | 1169 | CRYPTO_MAX_ALG_NAME) |
17db8546 | 1170 | goto out_drop_alg; |
73c89c15 | 1171 | |
adcbc688 HX |
1172 | inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
1173 | inst->alg.base.cra_priority = alg->base.cra_priority; | |
1174 | inst->alg.base.cra_blocksize = 1; | |
1175 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask; | |
73c89c15 | 1176 | |
adcbc688 | 1177 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx); |
73c89c15 | 1178 | |
adcbc688 HX |
1179 | inst->alg.ivsize = 8; |
1180 | inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); | |
73c89c15 | 1181 | |
adcbc688 HX |
1182 | inst->alg.init = crypto_rfc4543_init_tfm; |
1183 | inst->alg.exit = crypto_rfc4543_exit_tfm; | |
73c89c15 | 1184 | |
adcbc688 HX |
1185 | inst->alg.setkey = crypto_rfc4543_setkey; |
1186 | inst->alg.setauthsize = crypto_rfc4543_setauthsize; | |
1187 | inst->alg.encrypt = crypto_rfc4543_encrypt; | |
1188 | inst->alg.decrypt = crypto_rfc4543_decrypt; | |
73c89c15 | 1189 | |
adcbc688 HX |
1190 | err = aead_register_instance(tmpl, inst); |
1191 | if (err) | |
1192 | goto out_drop_alg; | |
73c89c15 TB |
1193 | |
1194 | out: | |
adcbc688 | 1195 | return err; |
73c89c15 TB |
1196 | |
1197 | out_drop_alg: | |
1198 | crypto_drop_aead(spawn); | |
1199 | out_free_inst: | |
1200 | kfree(inst); | |
73c89c15 TB |
1201 | goto out; |
1202 | } | |
1203 | ||
1204 | static void crypto_rfc4543_free(struct crypto_instance *inst) | |
1205 | { | |
9489667d JK |
1206 | struct crypto_rfc4543_instance_ctx *ctx = crypto_instance_ctx(inst); |
1207 | ||
1208 | crypto_drop_aead(&ctx->aead); | |
9489667d | 1209 | |
adcbc688 | 1210 | kfree(aead_instance(inst)); |
73c89c15 TB |
1211 | } |
1212 | ||
1213 | static struct crypto_template crypto_rfc4543_tmpl = { | |
1214 | .name = "rfc4543", | |
adcbc688 | 1215 | .create = crypto_rfc4543_create, |
73c89c15 TB |
1216 | .free = crypto_rfc4543_free, |
1217 | .module = THIS_MODULE, | |
1218 | }; | |
1219 | ||
28db8e3e MH |
1220 | static int __init crypto_gcm_module_init(void) |
1221 | { | |
d00aa19b HX |
1222 | int err; |
1223 | ||
adcbc688 | 1224 | gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL); |
9382d97a HY |
1225 | if (!gcm_zeroes) |
1226 | return -ENOMEM; | |
1227 | ||
adcbc688 HX |
1228 | sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf)); |
1229 | ||
d00aa19b HX |
1230 | err = crypto_register_template(&crypto_gcm_base_tmpl); |
1231 | if (err) | |
1232 | goto out; | |
1233 | ||
1234 | err = crypto_register_template(&crypto_gcm_tmpl); | |
1235 | if (err) | |
1236 | goto out_undo_base; | |
1237 | ||
dadbc53d HX |
1238 | err = crypto_register_template(&crypto_rfc4106_tmpl); |
1239 | if (err) | |
1240 | goto out_undo_gcm; | |
1241 | ||
73c89c15 TB |
1242 | err = crypto_register_template(&crypto_rfc4543_tmpl); |
1243 | if (err) | |
1244 | goto out_undo_rfc4106; | |
1245 | ||
9382d97a | 1246 | return 0; |
d00aa19b | 1247 | |
73c89c15 TB |
1248 | out_undo_rfc4106: |
1249 | crypto_unregister_template(&crypto_rfc4106_tmpl); | |
dadbc53d HX |
1250 | out_undo_gcm: |
1251 | crypto_unregister_template(&crypto_gcm_tmpl); | |
d00aa19b HX |
1252 | out_undo_base: |
1253 | crypto_unregister_template(&crypto_gcm_base_tmpl); | |
9382d97a HY |
1254 | out: |
1255 | kfree(gcm_zeroes); | |
1256 | return err; | |
28db8e3e MH |
1257 | } |
1258 | ||
1259 | static void __exit crypto_gcm_module_exit(void) | |
1260 | { | |
9382d97a | 1261 | kfree(gcm_zeroes); |
73c89c15 | 1262 | crypto_unregister_template(&crypto_rfc4543_tmpl); |
dadbc53d | 1263 | crypto_unregister_template(&crypto_rfc4106_tmpl); |
28db8e3e | 1264 | crypto_unregister_template(&crypto_gcm_tmpl); |
d00aa19b | 1265 | crypto_unregister_template(&crypto_gcm_base_tmpl); |
28db8e3e MH |
1266 | } |
1267 | ||
1268 | module_init(crypto_gcm_module_init); | |
1269 | module_exit(crypto_gcm_module_exit); | |
1270 | ||
1271 | MODULE_LICENSE("GPL"); | |
1272 | MODULE_DESCRIPTION("Galois/Counter Mode"); | |
1273 | MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>"); | |
5d26a105 KC |
1274 | MODULE_ALIAS_CRYPTO("gcm_base"); |
1275 | MODULE_ALIAS_CRYPTO("rfc4106"); | |
1276 | MODULE_ALIAS_CRYPTO("rfc4543"); | |
4943ba16 | 1277 | MODULE_ALIAS_CRYPTO("gcm"); |