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> |
1472e5eb | 12 | #include <crypto/internal/skcipher.h> |
42c271c6 | 13 | #include <crypto/scatterwalk.h> |
84c91152 | 14 | #include <linux/completion.h> |
28db8e3e MH |
15 | #include <linux/err.h> |
16 | #include <linux/init.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/slab.h> | |
20 | ||
28db8e3e | 21 | struct gcm_instance_ctx { |
1472e5eb | 22 | struct crypto_skcipher_spawn ctr; |
28db8e3e MH |
23 | }; |
24 | ||
25 | struct crypto_gcm_ctx { | |
26 | struct crypto_ablkcipher *ctr; | |
27 | struct gf128mul_4k *gf128; | |
28 | }; | |
29 | ||
30 | struct crypto_gcm_ghash_ctx { | |
31 | u32 bytes; | |
32 | u32 flags; | |
33 | struct gf128mul_4k *gf128; | |
34 | u8 buffer[16]; | |
35 | }; | |
36 | ||
37 | struct crypto_gcm_req_priv_ctx { | |
38 | u8 auth_tag[16]; | |
6160b289 | 39 | u8 iauth_tag[16]; |
84c91152 HX |
40 | struct scatterlist src[2]; |
41 | struct scatterlist dst[2]; | |
28db8e3e | 42 | struct crypto_gcm_ghash_ctx ghash; |
7f681378 | 43 | struct ablkcipher_request abreq; |
28db8e3e MH |
44 | }; |
45 | ||
84c91152 HX |
46 | struct crypto_gcm_setkey_result { |
47 | int err; | |
48 | struct completion completion; | |
49 | }; | |
50 | ||
2589469d HX |
51 | static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx( |
52 | struct aead_request *req) | |
53 | { | |
54 | unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); | |
55 | ||
56 | return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); | |
57 | } | |
58 | ||
28db8e3e MH |
59 | static void crypto_gcm_ghash_init(struct crypto_gcm_ghash_ctx *ctx, u32 flags, |
60 | struct gf128mul_4k *gf128) | |
61 | { | |
62 | ctx->bytes = 0; | |
63 | ctx->flags = flags; | |
64 | ctx->gf128 = gf128; | |
65 | memset(ctx->buffer, 0, 16); | |
66 | } | |
67 | ||
68 | static void crypto_gcm_ghash_update(struct crypto_gcm_ghash_ctx *ctx, | |
69 | const u8 *src, unsigned int srclen) | |
70 | { | |
71 | u8 *dst = ctx->buffer; | |
72 | ||
73 | if (ctx->bytes) { | |
74 | int n = min(srclen, ctx->bytes); | |
75 | u8 *pos = dst + (16 - ctx->bytes); | |
76 | ||
77 | ctx->bytes -= n; | |
78 | srclen -= n; | |
79 | ||
80 | while (n--) | |
81 | *pos++ ^= *src++; | |
82 | ||
83 | if (!ctx->bytes) | |
84 | gf128mul_4k_lle((be128 *)dst, ctx->gf128); | |
85 | } | |
86 | ||
87 | while (srclen >= 16) { | |
88 | crypto_xor(dst, src, 16); | |
89 | gf128mul_4k_lle((be128 *)dst, ctx->gf128); | |
90 | src += 16; | |
91 | srclen -= 16; | |
92 | } | |
93 | ||
94 | if (srclen) { | |
95 | ctx->bytes = 16 - srclen; | |
96 | while (srclen--) | |
97 | *dst++ ^= *src++; | |
98 | } | |
99 | } | |
100 | ||
101 | static void crypto_gcm_ghash_update_sg(struct crypto_gcm_ghash_ctx *ctx, | |
102 | struct scatterlist *sg, int len) | |
103 | { | |
104 | struct scatter_walk walk; | |
105 | u8 *src; | |
106 | int n; | |
107 | ||
6160b289 HX |
108 | if (!len) |
109 | return; | |
110 | ||
28db8e3e MH |
111 | scatterwalk_start(&walk, sg); |
112 | ||
113 | while (len) { | |
114 | n = scatterwalk_clamp(&walk, len); | |
115 | ||
116 | if (!n) { | |
b2ab4a57 | 117 | scatterwalk_start(&walk, scatterwalk_sg_next(walk.sg)); |
28db8e3e MH |
118 | n = scatterwalk_clamp(&walk, len); |
119 | } | |
120 | ||
121 | src = scatterwalk_map(&walk, 0); | |
122 | ||
123 | crypto_gcm_ghash_update(ctx, src, n); | |
124 | len -= n; | |
125 | ||
126 | scatterwalk_unmap(src, 0); | |
127 | scatterwalk_advance(&walk, n); | |
128 | scatterwalk_done(&walk, 0, len); | |
129 | if (len) | |
130 | crypto_yield(ctx->flags); | |
131 | } | |
132 | } | |
133 | ||
134 | static void crypto_gcm_ghash_flush(struct crypto_gcm_ghash_ctx *ctx) | |
135 | { | |
136 | u8 *dst = ctx->buffer; | |
137 | ||
138 | if (ctx->bytes) { | |
139 | u8 *tmp = dst + (16 - ctx->bytes); | |
140 | ||
141 | while (ctx->bytes--) | |
142 | *tmp++ ^= 0; | |
143 | ||
144 | gf128mul_4k_lle((be128 *)dst, ctx->gf128); | |
145 | } | |
146 | ||
147 | ctx->bytes = 0; | |
148 | } | |
149 | ||
150 | static void crypto_gcm_ghash_final_xor(struct crypto_gcm_ghash_ctx *ctx, | |
151 | unsigned int authlen, | |
152 | unsigned int cryptlen, u8 *dst) | |
153 | { | |
154 | u8 *buf = ctx->buffer; | |
155 | u128 lengths; | |
156 | ||
157 | lengths.a = cpu_to_be64(authlen * 8); | |
158 | lengths.b = cpu_to_be64(cryptlen * 8); | |
159 | ||
160 | crypto_gcm_ghash_flush(ctx); | |
161 | crypto_xor(buf, (u8 *)&lengths, 16); | |
162 | gf128mul_4k_lle((be128 *)buf, ctx->gf128); | |
163 | crypto_xor(dst, buf, 16); | |
164 | } | |
165 | ||
84c91152 | 166 | static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err) |
28db8e3e | 167 | { |
84c91152 | 168 | struct crypto_gcm_setkey_result *result = req->data; |
28db8e3e | 169 | |
84c91152 HX |
170 | if (err == -EINPROGRESS) |
171 | return; | |
172 | ||
173 | result->err = err; | |
174 | complete(&result->completion); | |
28db8e3e MH |
175 | } |
176 | ||
177 | static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key, | |
178 | unsigned int keylen) | |
179 | { | |
180 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); | |
181 | struct crypto_ablkcipher *ctr = ctx->ctr; | |
84c91152 HX |
182 | struct { |
183 | be128 hash; | |
184 | u8 iv[8]; | |
185 | ||
186 | struct crypto_gcm_setkey_result result; | |
187 | ||
188 | struct scatterlist sg[1]; | |
189 | struct ablkcipher_request req; | |
190 | } *data; | |
191 | int err; | |
28db8e3e MH |
192 | |
193 | crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK); | |
194 | crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) & | |
195 | CRYPTO_TFM_REQ_MASK); | |
196 | ||
197 | err = crypto_ablkcipher_setkey(ctr, key, keylen); | |
198 | if (err) | |
84c91152 | 199 | return err; |
28db8e3e MH |
200 | |
201 | crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) & | |
202 | CRYPTO_TFM_RES_MASK); | |
203 | ||
84c91152 HX |
204 | data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr), |
205 | GFP_KERNEL); | |
206 | if (!data) | |
207 | return -ENOMEM; | |
208 | ||
209 | init_completion(&data->result.completion); | |
210 | sg_init_one(data->sg, &data->hash, sizeof(data->hash)); | |
211 | ablkcipher_request_set_tfm(&data->req, ctr); | |
212 | ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP | | |
213 | CRYPTO_TFM_REQ_MAY_BACKLOG, | |
214 | crypto_gcm_setkey_done, | |
215 | &data->result); | |
216 | ablkcipher_request_set_crypt(&data->req, data->sg, data->sg, | |
217 | sizeof(data->hash), data->iv); | |
218 | ||
219 | err = crypto_ablkcipher_encrypt(&data->req); | |
220 | if (err == -EINPROGRESS || err == -EBUSY) { | |
221 | err = wait_for_completion_interruptible( | |
222 | &data->result.completion); | |
223 | if (!err) | |
224 | err = data->result.err; | |
225 | } | |
226 | ||
28db8e3e MH |
227 | if (err) |
228 | goto out; | |
229 | ||
230 | if (ctx->gf128 != NULL) | |
231 | gf128mul_free_4k(ctx->gf128); | |
232 | ||
84c91152 | 233 | ctx->gf128 = gf128mul_init_4k_lle(&data->hash); |
28db8e3e MH |
234 | |
235 | if (ctx->gf128 == NULL) | |
236 | err = -ENOMEM; | |
237 | ||
84c91152 HX |
238 | out: |
239 | kfree(data); | |
28db8e3e MH |
240 | return err; |
241 | } | |
242 | ||
84c91152 HX |
243 | static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req, |
244 | struct aead_request *req, | |
245 | unsigned int cryptlen) | |
28db8e3e MH |
246 | { |
247 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
248 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); | |
2589469d | 249 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
28db8e3e | 250 | u32 flags = req->base.tfm->crt_flags; |
28db8e3e | 251 | struct crypto_gcm_ghash_ctx *ghash = &pctx->ghash; |
84c91152 HX |
252 | struct scatterlist *dst; |
253 | __be32 counter = cpu_to_be32(1); | |
254 | ||
255 | memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag)); | |
256 | memcpy(req->iv + 12, &counter, 4); | |
257 | ||
258 | sg_init_table(pctx->src, 2); | |
259 | sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag)); | |
260 | scatterwalk_sg_chain(pctx->src, 2, req->src); | |
261 | ||
262 | dst = pctx->src; | |
263 | if (req->src != req->dst) { | |
264 | sg_init_table(pctx->dst, 2); | |
265 | sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag)); | |
266 | scatterwalk_sg_chain(pctx->dst, 2, req->dst); | |
267 | dst = pctx->dst; | |
268 | } | |
28db8e3e MH |
269 | |
270 | ablkcipher_request_set_tfm(ablk_req, ctx->ctr); | |
84c91152 HX |
271 | ablkcipher_request_set_crypt(ablk_req, pctx->src, dst, |
272 | cryptlen + sizeof(pctx->auth_tag), | |
273 | req->iv); | |
28db8e3e MH |
274 | |
275 | crypto_gcm_ghash_init(ghash, flags, ctx->gf128); | |
276 | ||
6160b289 HX |
277 | crypto_gcm_ghash_update_sg(ghash, req->assoc, req->assoclen); |
278 | crypto_gcm_ghash_flush(ghash); | |
28db8e3e MH |
279 | } |
280 | ||
6160b289 | 281 | static int crypto_gcm_hash(struct aead_request *req) |
28db8e3e | 282 | { |
6160b289 | 283 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
2589469d | 284 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
28db8e3e MH |
285 | u8 *auth_tag = pctx->auth_tag; |
286 | struct crypto_gcm_ghash_ctx *ghash = &pctx->ghash; | |
287 | ||
288 | crypto_gcm_ghash_update_sg(ghash, req->dst, req->cryptlen); | |
289 | crypto_gcm_ghash_final_xor(ghash, req->assoclen, req->cryptlen, | |
290 | auth_tag); | |
291 | ||
6160b289 HX |
292 | scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen, |
293 | crypto_aead_authsize(aead), 1); | |
294 | return 0; | |
295 | } | |
296 | ||
297 | static void crypto_gcm_encrypt_done(struct crypto_async_request *areq, int err) | |
298 | { | |
299 | struct aead_request *req = areq->data; | |
300 | ||
301 | if (!err) | |
302 | err = crypto_gcm_hash(req); | |
303 | ||
28db8e3e MH |
304 | aead_request_complete(req, err); |
305 | } | |
306 | ||
307 | static int crypto_gcm_encrypt(struct aead_request *req) | |
308 | { | |
2589469d | 309 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
7f681378 | 310 | struct ablkcipher_request *abreq = &pctx->abreq; |
84c91152 HX |
311 | int err; |
312 | ||
313 | crypto_gcm_init_crypt(abreq, req, req->cryptlen); | |
314 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
315 | crypto_gcm_encrypt_done, req); | |
28db8e3e | 316 | |
84c91152 | 317 | err = crypto_ablkcipher_encrypt(abreq); |
28db8e3e MH |
318 | if (err) |
319 | return err; | |
320 | ||
6160b289 | 321 | return crypto_gcm_hash(req); |
28db8e3e MH |
322 | } |
323 | ||
84c91152 HX |
324 | static int crypto_gcm_verify(struct aead_request *req) |
325 | { | |
326 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
327 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); | |
328 | struct crypto_gcm_ghash_ctx *ghash = &pctx->ghash; | |
329 | u8 *auth_tag = pctx->auth_tag; | |
330 | u8 *iauth_tag = pctx->iauth_tag; | |
331 | unsigned int authsize = crypto_aead_authsize(aead); | |
332 | unsigned int cryptlen = req->cryptlen - authsize; | |
333 | ||
334 | crypto_gcm_ghash_final_xor(ghash, req->assoclen, cryptlen, auth_tag); | |
335 | ||
336 | authsize = crypto_aead_authsize(aead); | |
337 | scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0); | |
338 | return memcmp(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0; | |
339 | } | |
340 | ||
28db8e3e MH |
341 | static void crypto_gcm_decrypt_done(struct crypto_async_request *areq, int err) |
342 | { | |
84c91152 HX |
343 | struct aead_request *req = areq->data; |
344 | ||
345 | if (!err) | |
346 | err = crypto_gcm_verify(req); | |
347 | ||
348 | aead_request_complete(req, err); | |
28db8e3e MH |
349 | } |
350 | ||
351 | static int crypto_gcm_decrypt(struct aead_request *req) | |
352 | { | |
6160b289 | 353 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
2589469d | 354 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
7f681378 | 355 | struct ablkcipher_request *abreq = &pctx->abreq; |
28db8e3e | 356 | struct crypto_gcm_ghash_ctx *ghash = &pctx->ghash; |
6160b289 HX |
357 | unsigned int cryptlen = req->cryptlen; |
358 | unsigned int authsize = crypto_aead_authsize(aead); | |
28db8e3e MH |
359 | int err; |
360 | ||
6160b289 | 361 | if (cryptlen < authsize) |
28db8e3e | 362 | return -EINVAL; |
6160b289 | 363 | cryptlen -= authsize; |
28db8e3e | 364 | |
84c91152 HX |
365 | crypto_gcm_init_crypt(abreq, req, cryptlen); |
366 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
367 | crypto_gcm_decrypt_done, req); | |
28db8e3e | 368 | |
6160b289 | 369 | crypto_gcm_ghash_update_sg(ghash, req->src, cryptlen); |
28db8e3e | 370 | |
84c91152 HX |
371 | err = crypto_ablkcipher_decrypt(abreq); |
372 | if (err) | |
373 | return err; | |
28db8e3e | 374 | |
84c91152 | 375 | return crypto_gcm_verify(req); |
28db8e3e MH |
376 | } |
377 | ||
378 | static int crypto_gcm_init_tfm(struct crypto_tfm *tfm) | |
379 | { | |
380 | struct crypto_instance *inst = (void *)tfm->__crt_alg; | |
381 | struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst); | |
382 | struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm); | |
383 | struct crypto_ablkcipher *ctr; | |
384 | unsigned long align; | |
385 | int err; | |
386 | ||
1472e5eb | 387 | ctr = crypto_spawn_skcipher(&ictx->ctr); |
28db8e3e MH |
388 | err = PTR_ERR(ctr); |
389 | if (IS_ERR(ctr)) | |
390 | return err; | |
391 | ||
392 | ctx->ctr = ctr; | |
393 | ctx->gf128 = NULL; | |
394 | ||
2589469d | 395 | align = crypto_tfm_alg_alignmask(tfm); |
28db8e3e | 396 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
7f681378 HX |
397 | tfm->crt_aead.reqsize = align + |
398 | sizeof(struct crypto_gcm_req_priv_ctx) + | |
399 | crypto_ablkcipher_reqsize(ctr); | |
28db8e3e MH |
400 | |
401 | return 0; | |
402 | } | |
403 | ||
404 | static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm) | |
405 | { | |
406 | struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm); | |
407 | ||
408 | if (ctx->gf128 != NULL) | |
409 | gf128mul_free_4k(ctx->gf128); | |
410 | ||
411 | crypto_free_ablkcipher(ctx->ctr); | |
412 | } | |
413 | ||
d00aa19b HX |
414 | static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb, |
415 | const char *full_name, | |
416 | const char *ctr_name) | |
28db8e3e | 417 | { |
d00aa19b | 418 | struct crypto_attr_type *algt; |
28db8e3e MH |
419 | struct crypto_instance *inst; |
420 | struct crypto_alg *ctr; | |
28db8e3e MH |
421 | struct gcm_instance_ctx *ctx; |
422 | int err; | |
28db8e3e | 423 | |
d00aa19b HX |
424 | algt = crypto_get_attr_type(tb); |
425 | err = PTR_ERR(algt); | |
426 | if (IS_ERR(algt)) | |
28db8e3e MH |
427 | return ERR_PTR(err); |
428 | ||
d00aa19b HX |
429 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
430 | return ERR_PTR(-EINVAL); | |
28db8e3e | 431 | |
1472e5eb HX |
432 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
433 | if (!inst) | |
434 | return ERR_PTR(-ENOMEM); | |
28db8e3e | 435 | |
1472e5eb HX |
436 | ctx = crypto_instance_ctx(inst); |
437 | crypto_set_skcipher_spawn(&ctx->ctr, inst); | |
438 | err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0, | |
439 | crypto_requires_sync(algt->type, | |
440 | algt->mask)); | |
441 | if (err) | |
442 | goto err_free_inst; | |
443 | ||
444 | ctr = crypto_skcipher_spawn_alg(&ctx->ctr); | |
28db8e3e | 445 | |
d00aa19b | 446 | /* We only support 16-byte blocks. */ |
1472e5eb | 447 | if (ctr->cra_ablkcipher.ivsize != 16) |
d00aa19b HX |
448 | goto out_put_ctr; |
449 | ||
450 | /* Not a stream cipher? */ | |
451 | err = -EINVAL; | |
452 | if (ctr->cra_blocksize != 1) | |
28db8e3e MH |
453 | goto out_put_ctr; |
454 | ||
28db8e3e | 455 | err = -ENAMETOOLONG; |
d00aa19b HX |
456 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
457 | "gcm_base(%s)", ctr->cra_driver_name) >= | |
458 | CRYPTO_MAX_ALG_NAME) | |
1472e5eb | 459 | goto out_put_ctr; |
28db8e3e | 460 | |
d00aa19b HX |
461 | memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME); |
462 | ||
1472e5eb HX |
463 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; |
464 | inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC; | |
28db8e3e | 465 | inst->alg.cra_priority = ctr->cra_priority; |
d00aa19b | 466 | inst->alg.cra_blocksize = 1; |
2589469d | 467 | inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1); |
28db8e3e | 468 | inst->alg.cra_type = &crypto_aead_type; |
84c91152 | 469 | inst->alg.cra_aead.ivsize = 16; |
7ba683a6 | 470 | inst->alg.cra_aead.maxauthsize = 16; |
28db8e3e MH |
471 | inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx); |
472 | inst->alg.cra_init = crypto_gcm_init_tfm; | |
473 | inst->alg.cra_exit = crypto_gcm_exit_tfm; | |
474 | inst->alg.cra_aead.setkey = crypto_gcm_setkey; | |
475 | inst->alg.cra_aead.encrypt = crypto_gcm_encrypt; | |
476 | inst->alg.cra_aead.decrypt = crypto_gcm_decrypt; | |
477 | ||
478 | out: | |
28db8e3e | 479 | return inst; |
1472e5eb HX |
480 | |
481 | out_put_ctr: | |
482 | crypto_drop_skcipher(&ctx->ctr); | |
28db8e3e MH |
483 | err_free_inst: |
484 | kfree(inst); | |
28db8e3e MH |
485 | inst = ERR_PTR(err); |
486 | goto out; | |
487 | } | |
488 | ||
d00aa19b HX |
489 | static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb) |
490 | { | |
491 | int err; | |
492 | const char *cipher_name; | |
493 | char ctr_name[CRYPTO_MAX_ALG_NAME]; | |
494 | char full_name[CRYPTO_MAX_ALG_NAME]; | |
495 | ||
496 | cipher_name = crypto_attr_alg_name(tb[1]); | |
497 | err = PTR_ERR(cipher_name); | |
498 | if (IS_ERR(cipher_name)) | |
499 | return ERR_PTR(err); | |
500 | ||
501 | if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >= | |
502 | CRYPTO_MAX_ALG_NAME) | |
503 | return ERR_PTR(-ENAMETOOLONG); | |
504 | ||
505 | if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >= | |
506 | CRYPTO_MAX_ALG_NAME) | |
507 | return ERR_PTR(-ENAMETOOLONG); | |
508 | ||
509 | return crypto_gcm_alloc_common(tb, full_name, ctr_name); | |
510 | } | |
511 | ||
28db8e3e MH |
512 | static void crypto_gcm_free(struct crypto_instance *inst) |
513 | { | |
514 | struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst); | |
515 | ||
1472e5eb | 516 | crypto_drop_skcipher(&ctx->ctr); |
28db8e3e MH |
517 | kfree(inst); |
518 | } | |
519 | ||
520 | static struct crypto_template crypto_gcm_tmpl = { | |
521 | .name = "gcm", | |
522 | .alloc = crypto_gcm_alloc, | |
523 | .free = crypto_gcm_free, | |
524 | .module = THIS_MODULE, | |
525 | }; | |
526 | ||
d00aa19b HX |
527 | static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb) |
528 | { | |
529 | int err; | |
530 | const char *ctr_name; | |
531 | char full_name[CRYPTO_MAX_ALG_NAME]; | |
532 | ||
533 | ctr_name = crypto_attr_alg_name(tb[1]); | |
534 | err = PTR_ERR(ctr_name); | |
535 | if (IS_ERR(ctr_name)) | |
536 | return ERR_PTR(err); | |
537 | ||
538 | if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s)", | |
539 | ctr_name) >= CRYPTO_MAX_ALG_NAME) | |
540 | return ERR_PTR(-ENAMETOOLONG); | |
541 | ||
542 | return crypto_gcm_alloc_common(tb, full_name, ctr_name); | |
543 | } | |
544 | ||
545 | static struct crypto_template crypto_gcm_base_tmpl = { | |
546 | .name = "gcm_base", | |
547 | .alloc = crypto_gcm_base_alloc, | |
548 | .free = crypto_gcm_free, | |
549 | .module = THIS_MODULE, | |
550 | }; | |
551 | ||
28db8e3e MH |
552 | static int __init crypto_gcm_module_init(void) |
553 | { | |
d00aa19b HX |
554 | int err; |
555 | ||
556 | err = crypto_register_template(&crypto_gcm_base_tmpl); | |
557 | if (err) | |
558 | goto out; | |
559 | ||
560 | err = crypto_register_template(&crypto_gcm_tmpl); | |
561 | if (err) | |
562 | goto out_undo_base; | |
563 | ||
564 | out: | |
565 | return err; | |
566 | ||
567 | out_undo_base: | |
568 | crypto_unregister_template(&crypto_gcm_base_tmpl); | |
569 | goto out; | |
28db8e3e MH |
570 | } |
571 | ||
572 | static void __exit crypto_gcm_module_exit(void) | |
573 | { | |
574 | crypto_unregister_template(&crypto_gcm_tmpl); | |
d00aa19b | 575 | crypto_unregister_template(&crypto_gcm_base_tmpl); |
28db8e3e MH |
576 | } |
577 | ||
578 | module_init(crypto_gcm_module_init); | |
579 | module_exit(crypto_gcm_module_exit); | |
580 | ||
581 | MODULE_LICENSE("GPL"); | |
582 | MODULE_DESCRIPTION("Galois/Counter Mode"); | |
583 | MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>"); | |
d00aa19b | 584 | MODULE_ALIAS("gcm_base"); |