blob: 2e403f6138c14bbcb048d59256f0fb40e2032f2d [file] [log] [blame]
Mikko Herranen28db8e32007-11-26 22:24:11 +08001/*
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
Mikko Herranen28db8e32007-11-26 22:24:11 +080011#include <crypto/gf128mul.h>
Herbert Xudadbc532007-12-17 15:33:17 +080012#include <crypto/internal/aead.h>
Herbert Xu1472e5e2007-12-07 19:26:11 +080013#include <crypto/internal/skcipher.h>
Huang Ying9382d972009-08-06 15:34:26 +100014#include <crypto/internal/hash.h>
Herbert Xu42c271c2007-12-07 18:52:49 +080015#include <crypto/scatterwalk.h>
Huang Ying9382d972009-08-06 15:34:26 +100016#include <crypto/hash.h>
17#include "internal.h"
Herbert Xu84c91152007-12-17 21:42:08 +080018#include <linux/completion.h>
Mikko Herranen28db8e32007-11-26 22:24:11 +080019#include <linux/err.h>
20#include <linux/init.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/slab.h>
24
Mikko Herranen28db8e32007-11-26 22:24:11 +080025struct gcm_instance_ctx {
Herbert Xu1472e5e2007-12-07 19:26:11 +080026 struct crypto_skcipher_spawn ctr;
Huang Ying9382d972009-08-06 15:34:26 +100027 struct crypto_ahash_spawn ghash;
Mikko Herranen28db8e32007-11-26 22:24:11 +080028};
29
30struct crypto_gcm_ctx {
31 struct crypto_ablkcipher *ctr;
Huang Ying9382d972009-08-06 15:34:26 +100032 struct crypto_ahash *ghash;
Mikko Herranen28db8e32007-11-26 22:24:11 +080033};
34
Herbert Xudadbc532007-12-17 15:33:17 +080035struct crypto_rfc4106_ctx {
36 struct crypto_aead *child;
37 u8 nonce[4];
38};
39
Jussi Kivilinna9489667d2013-04-07 16:43:41 +030040struct crypto_rfc4543_instance_ctx {
41 struct crypto_aead_spawn aead;
42 struct crypto_skcipher_spawn null;
43};
44
Tobias Brunner73c89c12010-01-17 21:52:11 +110045struct crypto_rfc4543_ctx {
46 struct crypto_aead *child;
Jussi Kivilinna9489667d2013-04-07 16:43:41 +030047 struct crypto_blkcipher *null;
Tobias Brunner73c89c12010-01-17 21:52:11 +110048 u8 nonce[4];
49};
50
51struct crypto_rfc4543_req_ctx {
52 u8 auth_tag[16];
Jussi Kivilinnad3dde522013-03-28 21:54:03 +020053 u8 assocbuf[32];
Tobias Brunner73c89c12010-01-17 21:52:11 +110054 struct scatterlist cipher[1];
55 struct scatterlist payload[2];
56 struct scatterlist assoc[2];
57 struct aead_request subreq;
58};
59
Mikko Herranen28db8e32007-11-26 22:24:11 +080060struct crypto_gcm_ghash_ctx {
Huang Ying9382d972009-08-06 15:34:26 +100061 unsigned int cryptlen;
62 struct scatterlist *src;
Huang Ying62c55932009-11-16 21:52:22 +080063 void (*complete)(struct aead_request *req, int err);
Mikko Herranen28db8e32007-11-26 22:24:11 +080064};
65
66struct crypto_gcm_req_priv_ctx {
67 u8 auth_tag[16];
Herbert Xu6160b282007-12-04 19:17:50 +110068 u8 iauth_tag[16];
Herbert Xu84c91152007-12-17 21:42:08 +080069 struct scatterlist src[2];
70 struct scatterlist dst[2];
Huang Ying9382d972009-08-06 15:34:26 +100071 struct crypto_gcm_ghash_ctx ghash_ctx;
72 union {
73 struct ahash_request ahreq;
74 struct ablkcipher_request abreq;
75 } u;
Mikko Herranen28db8e32007-11-26 22:24:11 +080076};
77
Herbert Xu84c91152007-12-17 21:42:08 +080078struct crypto_gcm_setkey_result {
79 int err;
80 struct completion completion;
81};
82
Huang Ying9382d972009-08-06 15:34:26 +100083static void *gcm_zeroes;
84
Herbert Xu25894692007-12-12 19:16:38 +080085static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
86 struct aead_request *req)
87{
88 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
89
90 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
91}
92
Herbert Xu84c91152007-12-17 21:42:08 +080093static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
Mikko Herranen28db8e32007-11-26 22:24:11 +080094{
Herbert Xu84c91152007-12-17 21:42:08 +080095 struct crypto_gcm_setkey_result *result = req->data;
Mikko Herranen28db8e32007-11-26 22:24:11 +080096
Herbert Xu84c91152007-12-17 21:42:08 +080097 if (err == -EINPROGRESS)
98 return;
Mikko Herranen28db8e32007-11-26 22:24:11 +080099
Herbert Xu84c91152007-12-17 21:42:08 +0800100 result->err = err;
101 complete(&result->completion);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800102}
103
104static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
105 unsigned int keylen)
106{
107 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
Huang Ying9382d972009-08-06 15:34:26 +1000108 struct crypto_ahash *ghash = ctx->ghash;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800109 struct crypto_ablkcipher *ctr = ctx->ctr;
Herbert Xu84c91152007-12-17 21:42:08 +0800110 struct {
111 be128 hash;
112 u8 iv[8];
113
114 struct crypto_gcm_setkey_result result;
115
116 struct scatterlist sg[1];
117 struct ablkcipher_request req;
118 } *data;
119 int err;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800120
121 crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
122 crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
123 CRYPTO_TFM_REQ_MASK);
124
125 err = crypto_ablkcipher_setkey(ctr, key, keylen);
126 if (err)
Herbert Xu84c91152007-12-17 21:42:08 +0800127 return err;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800128
129 crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
130 CRYPTO_TFM_RES_MASK);
131
Herbert Xu84c91152007-12-17 21:42:08 +0800132 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
Mikko Herranen28db8e32007-11-26 22:24:11 +0800155 if (err)
156 goto out;
157
Huang Ying9382d972009-08-06 15:34:26 +1000158 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);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800164
Herbert Xu84c91152007-12-17 21:42:08 +0800165out:
166 kfree(data);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800167 return err;
168}
169
Herbert Xudadbc532007-12-17 15:33:17 +0800170static 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
Herbert Xu84c91152007-12-17 21:42:08 +0800189static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
190 struct aead_request *req,
191 unsigned int cryptlen)
Mikko Herranen28db8e32007-11-26 22:24:11 +0800192{
193 struct crypto_aead *aead = crypto_aead_reqtfm(req);
194 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
Herbert Xu25894692007-12-12 19:16:38 +0800195 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Herbert Xu84c91152007-12-17 21:42:08 +0800196 struct scatterlist *dst;
197 __be32 counter = cpu_to_be32(1);
198
199 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
200 memcpy(req->iv + 12, &counter, 4);
201
202 sg_init_table(pctx->src, 2);
203 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
204 scatterwalk_sg_chain(pctx->src, 2, req->src);
205
206 dst = pctx->src;
207 if (req->src != req->dst) {
208 sg_init_table(pctx->dst, 2);
209 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
210 scatterwalk_sg_chain(pctx->dst, 2, req->dst);
211 dst = pctx->dst;
212 }
Mikko Herranen28db8e32007-11-26 22:24:11 +0800213
214 ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
Herbert Xu84c91152007-12-17 21:42:08 +0800215 ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
216 cryptlen + sizeof(pctx->auth_tag),
217 req->iv);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800218}
219
Huang Ying9382d972009-08-06 15:34:26 +1000220static inline unsigned int gcm_remain(unsigned int len)
Mikko Herranen28db8e32007-11-26 22:24:11 +0800221{
Huang Ying9382d972009-08-06 15:34:26 +1000222 len &= 0xfU;
223 return len ? 16 - len : 0;
224}
225
226static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
227static void gcm_hash_final_done(struct crypto_async_request *areq, int err);
228
229static int gcm_hash_update(struct aead_request *req,
230 struct crypto_gcm_req_priv_ctx *pctx,
Mark Rustad3e3dc252014-07-25 02:53:38 -0700231 crypto_completion_t compl,
Huang Ying9382d972009-08-06 15:34:26 +1000232 struct scatterlist *src,
233 unsigned int len)
234{
235 struct ahash_request *ahreq = &pctx->u.ahreq;
236
237 ahash_request_set_callback(ahreq, aead_request_flags(req),
Mark Rustad3e3dc252014-07-25 02:53:38 -0700238 compl, req);
Huang Ying9382d972009-08-06 15:34:26 +1000239 ahash_request_set_crypt(ahreq, src, NULL, len);
240
241 return crypto_ahash_update(ahreq);
242}
243
244static int gcm_hash_remain(struct aead_request *req,
245 struct crypto_gcm_req_priv_ctx *pctx,
246 unsigned int remain,
Mark Rustad3e3dc252014-07-25 02:53:38 -0700247 crypto_completion_t compl)
Huang Ying9382d972009-08-06 15:34:26 +1000248{
249 struct ahash_request *ahreq = &pctx->u.ahreq;
250
251 ahash_request_set_callback(ahreq, aead_request_flags(req),
Mark Rustad3e3dc252014-07-25 02:53:38 -0700252 compl, req);
Huang Ying9382d972009-08-06 15:34:26 +1000253 sg_init_one(pctx->src, gcm_zeroes, remain);
254 ahash_request_set_crypt(ahreq, pctx->src, NULL, remain);
255
256 return crypto_ahash_update(ahreq);
257}
258
259static int gcm_hash_len(struct aead_request *req,
260 struct crypto_gcm_req_priv_ctx *pctx)
261{
262 struct ahash_request *ahreq = &pctx->u.ahreq;
263 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
264 u128 lengths;
265
266 lengths.a = cpu_to_be64(req->assoclen * 8);
267 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
268 memcpy(pctx->iauth_tag, &lengths, 16);
269 sg_init_one(pctx->src, pctx->iauth_tag, 16);
270 ahash_request_set_callback(ahreq, aead_request_flags(req),
271 gcm_hash_len_done, req);
272 ahash_request_set_crypt(ahreq, pctx->src,
273 NULL, sizeof(lengths));
274
275 return crypto_ahash_update(ahreq);
276}
277
278static int gcm_hash_final(struct aead_request *req,
279 struct crypto_gcm_req_priv_ctx *pctx)
280{
281 struct ahash_request *ahreq = &pctx->u.ahreq;
282
283 ahash_request_set_callback(ahreq, aead_request_flags(req),
284 gcm_hash_final_done, req);
285 ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0);
286
287 return crypto_ahash_final(ahreq);
288}
289
Huang Ying62c55932009-11-16 21:52:22 +0800290static void __gcm_hash_final_done(struct aead_request *req, int err)
Huang Ying9382d972009-08-06 15:34:26 +1000291{
Herbert Xu25894692007-12-12 19:16:38 +0800292 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Huang Ying9382d972009-08-06 15:34:26 +1000293 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800294
Huang Ying9382d972009-08-06 15:34:26 +1000295 if (!err)
296 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800297
Huang Ying62c55932009-11-16 21:52:22 +0800298 gctx->complete(req, err);
Huang Ying9382d972009-08-06 15:34:26 +1000299}
300
Huang Ying62c55932009-11-16 21:52:22 +0800301static void gcm_hash_final_done(struct crypto_async_request *areq, int err)
Huang Ying9382d972009-08-06 15:34:26 +1000302{
303 struct aead_request *req = areq->data;
Huang Ying62c55932009-11-16 21:52:22 +0800304
305 __gcm_hash_final_done(req, err);
306}
307
308static void __gcm_hash_len_done(struct aead_request *req, int err)
309{
Huang Ying9382d972009-08-06 15:34:26 +1000310 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
311
312 if (!err) {
313 err = gcm_hash_final(req, pctx);
314 if (err == -EINPROGRESS || err == -EBUSY)
315 return;
316 }
317
Huang Ying62c55932009-11-16 21:52:22 +0800318 __gcm_hash_final_done(req, err);
Huang Ying9382d972009-08-06 15:34:26 +1000319}
320
Huang Ying62c55932009-11-16 21:52:22 +0800321static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
Huang Ying9382d972009-08-06 15:34:26 +1000322{
323 struct aead_request *req = areq->data;
Huang Ying62c55932009-11-16 21:52:22 +0800324
325 __gcm_hash_len_done(req, err);
326}
327
328static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err)
329{
Huang Ying9382d972009-08-06 15:34:26 +1000330 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
331
332 if (!err) {
333 err = gcm_hash_len(req, pctx);
334 if (err == -EINPROGRESS || err == -EBUSY)
335 return;
336 }
337
Huang Ying62c55932009-11-16 21:52:22 +0800338 __gcm_hash_len_done(req, err);
Huang Ying9382d972009-08-06 15:34:26 +1000339}
340
Huang Ying62c55932009-11-16 21:52:22 +0800341static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
342 int err)
Huang Ying9382d972009-08-06 15:34:26 +1000343{
344 struct aead_request *req = areq->data;
Huang Ying62c55932009-11-16 21:52:22 +0800345
346 __gcm_hash_crypt_remain_done(req, err);
347}
348
349static void __gcm_hash_crypt_done(struct aead_request *req, int err)
350{
Huang Ying9382d972009-08-06 15:34:26 +1000351 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
352 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
353 unsigned int remain;
354
355 if (!err) {
356 remain = gcm_remain(gctx->cryptlen);
357 BUG_ON(!remain);
358 err = gcm_hash_remain(req, pctx, remain,
359 gcm_hash_crypt_remain_done);
360 if (err == -EINPROGRESS || err == -EBUSY)
361 return;
362 }
363
Huang Ying62c55932009-11-16 21:52:22 +0800364 __gcm_hash_crypt_remain_done(req, err);
Huang Ying9382d972009-08-06 15:34:26 +1000365}
366
Huang Ying62c55932009-11-16 21:52:22 +0800367static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
Huang Ying9382d972009-08-06 15:34:26 +1000368{
369 struct aead_request *req = areq->data;
Huang Ying62c55932009-11-16 21:52:22 +0800370
371 __gcm_hash_crypt_done(req, err);
372}
373
374static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err)
375{
Huang Ying9382d972009-08-06 15:34:26 +1000376 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
377 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
Mark Rustad3e3dc252014-07-25 02:53:38 -0700378 crypto_completion_t compl;
Huang Ying9382d972009-08-06 15:34:26 +1000379 unsigned int remain = 0;
380
381 if (!err && gctx->cryptlen) {
382 remain = gcm_remain(gctx->cryptlen);
Mark Rustad3e3dc252014-07-25 02:53:38 -0700383 compl = remain ? gcm_hash_crypt_done :
Huang Ying9382d972009-08-06 15:34:26 +1000384 gcm_hash_crypt_remain_done;
Mark Rustad3e3dc252014-07-25 02:53:38 -0700385 err = gcm_hash_update(req, pctx, compl,
Huang Ying9382d972009-08-06 15:34:26 +1000386 gctx->src, gctx->cryptlen);
387 if (err == -EINPROGRESS || err == -EBUSY)
388 return;
389 }
390
391 if (remain)
Huang Ying62c55932009-11-16 21:52:22 +0800392 __gcm_hash_crypt_done(req, err);
Huang Ying9382d972009-08-06 15:34:26 +1000393 else
Huang Ying62c55932009-11-16 21:52:22 +0800394 __gcm_hash_crypt_remain_done(req, err);
Huang Ying9382d972009-08-06 15:34:26 +1000395}
396
Huang Ying62c55932009-11-16 21:52:22 +0800397static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
398 int err)
Huang Ying9382d972009-08-06 15:34:26 +1000399{
400 struct aead_request *req = areq->data;
Huang Ying62c55932009-11-16 21:52:22 +0800401
402 __gcm_hash_assoc_remain_done(req, err);
403}
404
405static void __gcm_hash_assoc_done(struct aead_request *req, int err)
406{
Huang Ying9382d972009-08-06 15:34:26 +1000407 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
408 unsigned int remain;
409
410 if (!err) {
411 remain = gcm_remain(req->assoclen);
412 BUG_ON(!remain);
413 err = gcm_hash_remain(req, pctx, remain,
414 gcm_hash_assoc_remain_done);
415 if (err == -EINPROGRESS || err == -EBUSY)
416 return;
417 }
418
Huang Ying62c55932009-11-16 21:52:22 +0800419 __gcm_hash_assoc_remain_done(req, err);
Huang Ying9382d972009-08-06 15:34:26 +1000420}
421
Huang Ying62c55932009-11-16 21:52:22 +0800422static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
Huang Ying9382d972009-08-06 15:34:26 +1000423{
424 struct aead_request *req = areq->data;
Huang Ying62c55932009-11-16 21:52:22 +0800425
426 __gcm_hash_assoc_done(req, err);
427}
428
429static void __gcm_hash_init_done(struct aead_request *req, int err)
430{
Huang Ying9382d972009-08-06 15:34:26 +1000431 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Mark Rustad3e3dc252014-07-25 02:53:38 -0700432 crypto_completion_t compl;
Huang Ying9382d972009-08-06 15:34:26 +1000433 unsigned int remain = 0;
434
435 if (!err && req->assoclen) {
436 remain = gcm_remain(req->assoclen);
Mark Rustad3e3dc252014-07-25 02:53:38 -0700437 compl = remain ? gcm_hash_assoc_done :
Huang Ying9382d972009-08-06 15:34:26 +1000438 gcm_hash_assoc_remain_done;
Mark Rustad3e3dc252014-07-25 02:53:38 -0700439 err = gcm_hash_update(req, pctx, compl,
Huang Ying9382d972009-08-06 15:34:26 +1000440 req->assoc, req->assoclen);
441 if (err == -EINPROGRESS || err == -EBUSY)
442 return;
443 }
444
445 if (remain)
Huang Ying62c55932009-11-16 21:52:22 +0800446 __gcm_hash_assoc_done(req, err);
Huang Ying9382d972009-08-06 15:34:26 +1000447 else
Huang Ying62c55932009-11-16 21:52:22 +0800448 __gcm_hash_assoc_remain_done(req, err);
449}
450
451static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
452{
453 struct aead_request *req = areq->data;
454
455 __gcm_hash_init_done(req, err);
Huang Ying9382d972009-08-06 15:34:26 +1000456}
457
458static int gcm_hash(struct aead_request *req,
459 struct crypto_gcm_req_priv_ctx *pctx)
460{
461 struct ahash_request *ahreq = &pctx->u.ahreq;
462 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
463 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
464 unsigned int remain;
Mark Rustad3e3dc252014-07-25 02:53:38 -0700465 crypto_completion_t compl;
Huang Ying9382d972009-08-06 15:34:26 +1000466 int err;
467
468 ahash_request_set_tfm(ahreq, ctx->ghash);
469
470 ahash_request_set_callback(ahreq, aead_request_flags(req),
471 gcm_hash_init_done, req);
472 err = crypto_ahash_init(ahreq);
473 if (err)
474 return err;
475 remain = gcm_remain(req->assoclen);
Mark Rustad3e3dc252014-07-25 02:53:38 -0700476 compl = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done;
477 err = gcm_hash_update(req, pctx, compl, req->assoc, req->assoclen);
Huang Ying9382d972009-08-06 15:34:26 +1000478 if (err)
479 return err;
480 if (remain) {
481 err = gcm_hash_remain(req, pctx, remain,
482 gcm_hash_assoc_remain_done);
483 if (err)
484 return err;
485 }
486 remain = gcm_remain(gctx->cryptlen);
Mark Rustad3e3dc252014-07-25 02:53:38 -0700487 compl = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done;
488 err = gcm_hash_update(req, pctx, compl, gctx->src, gctx->cryptlen);
Huang Ying9382d972009-08-06 15:34:26 +1000489 if (err)
490 return err;
491 if (remain) {
492 err = gcm_hash_remain(req, pctx, remain,
493 gcm_hash_crypt_remain_done);
494 if (err)
495 return err;
496 }
497 err = gcm_hash_len(req, pctx);
498 if (err)
499 return err;
500 err = gcm_hash_final(req, pctx);
501 if (err)
502 return err;
503
Herbert Xu6160b282007-12-04 19:17:50 +1100504 return 0;
505}
506
Huang Ying9382d972009-08-06 15:34:26 +1000507static void gcm_enc_copy_hash(struct aead_request *req,
508 struct crypto_gcm_req_priv_ctx *pctx)
509{
510 struct crypto_aead *aead = crypto_aead_reqtfm(req);
511 u8 *auth_tag = pctx->auth_tag;
512
513 scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
514 crypto_aead_authsize(aead), 1);
515}
516
Huang Ying62c55932009-11-16 21:52:22 +0800517static void gcm_enc_hash_done(struct aead_request *req, int err)
Herbert Xu6160b282007-12-04 19:17:50 +1100518{
Huang Ying9382d972009-08-06 15:34:26 +1000519 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Herbert Xu6160b282007-12-04 19:17:50 +1100520
521 if (!err)
Huang Ying9382d972009-08-06 15:34:26 +1000522 gcm_enc_copy_hash(req, pctx);
Herbert Xu6160b282007-12-04 19:17:50 +1100523
Mikko Herranen28db8e32007-11-26 22:24:11 +0800524 aead_request_complete(req, err);
525}
526
Huang Ying62c55932009-11-16 21:52:22 +0800527static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
Huang Ying9382d972009-08-06 15:34:26 +1000528{
529 struct aead_request *req = areq->data;
530 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
531
532 if (!err) {
533 err = gcm_hash(req, pctx);
534 if (err == -EINPROGRESS || err == -EBUSY)
535 return;
Huang Ying62c55932009-11-16 21:52:22 +0800536 else if (!err) {
537 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
538 gcm_enc_copy_hash(req, pctx);
539 }
Huang Ying9382d972009-08-06 15:34:26 +1000540 }
541
Huang Ying62c55932009-11-16 21:52:22 +0800542 aead_request_complete(req, err);
Huang Ying9382d972009-08-06 15:34:26 +1000543}
544
Mikko Herranen28db8e32007-11-26 22:24:11 +0800545static int crypto_gcm_encrypt(struct aead_request *req)
546{
Herbert Xu25894692007-12-12 19:16:38 +0800547 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Huang Ying9382d972009-08-06 15:34:26 +1000548 struct ablkcipher_request *abreq = &pctx->u.abreq;
549 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
Herbert Xu84c91152007-12-17 21:42:08 +0800550 int err;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800551
Herbert Xu84c91152007-12-17 21:42:08 +0800552 crypto_gcm_init_crypt(abreq, req, req->cryptlen);
553 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
Huang Ying9382d972009-08-06 15:34:26 +1000554 gcm_encrypt_done, req);
555
556 gctx->src = req->dst;
557 gctx->cryptlen = req->cryptlen;
558 gctx->complete = gcm_enc_hash_done;
Herbert Xu84c91152007-12-17 21:42:08 +0800559
560 err = crypto_ablkcipher_encrypt(abreq);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800561 if (err)
562 return err;
563
Huang Ying9382d972009-08-06 15:34:26 +1000564 err = gcm_hash(req, pctx);
565 if (err)
566 return err;
567
568 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
569 gcm_enc_copy_hash(req, pctx);
570
571 return 0;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800572}
573
Huang Ying9382d972009-08-06 15:34:26 +1000574static int crypto_gcm_verify(struct aead_request *req,
575 struct crypto_gcm_req_priv_ctx *pctx)
Herbert Xu84c91152007-12-17 21:42:08 +0800576{
577 struct crypto_aead *aead = crypto_aead_reqtfm(req);
Herbert Xu84c91152007-12-17 21:42:08 +0800578 u8 *auth_tag = pctx->auth_tag;
579 u8 *iauth_tag = pctx->iauth_tag;
580 unsigned int authsize = crypto_aead_authsize(aead);
581 unsigned int cryptlen = req->cryptlen - authsize;
582
Huang Ying9382d972009-08-06 15:34:26 +1000583 crypto_xor(auth_tag, iauth_tag, 16);
Herbert Xu84c91152007-12-17 21:42:08 +0800584 scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
James Yonan6bf37e52013-09-26 02:20:39 -0600585 return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
Herbert Xu84c91152007-12-17 21:42:08 +0800586}
587
Huang Ying9382d972009-08-06 15:34:26 +1000588static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
Mikko Herranen28db8e32007-11-26 22:24:11 +0800589{
Herbert Xu84c91152007-12-17 21:42:08 +0800590 struct aead_request *req = areq->data;
Huang Ying9382d972009-08-06 15:34:26 +1000591 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Herbert Xu84c91152007-12-17 21:42:08 +0800592
593 if (!err)
Huang Ying9382d972009-08-06 15:34:26 +1000594 err = crypto_gcm_verify(req, pctx);
Herbert Xu84c91152007-12-17 21:42:08 +0800595
596 aead_request_complete(req, err);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800597}
598
Huang Ying62c55932009-11-16 21:52:22 +0800599static void gcm_dec_hash_done(struct aead_request *req, int err)
Huang Ying9382d972009-08-06 15:34:26 +1000600{
Huang Ying9382d972009-08-06 15:34:26 +1000601 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
602 struct ablkcipher_request *abreq = &pctx->u.abreq;
603 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
604
605 if (!err) {
606 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
607 gcm_decrypt_done, req);
608 crypto_gcm_init_crypt(abreq, req, gctx->cryptlen);
609 err = crypto_ablkcipher_decrypt(abreq);
610 if (err == -EINPROGRESS || err == -EBUSY)
611 return;
Huang Ying62c55932009-11-16 21:52:22 +0800612 else if (!err)
613 err = crypto_gcm_verify(req, pctx);
Huang Ying9382d972009-08-06 15:34:26 +1000614 }
615
Huang Ying62c55932009-11-16 21:52:22 +0800616 aead_request_complete(req, err);
Huang Ying9382d972009-08-06 15:34:26 +1000617}
618
Mikko Herranen28db8e32007-11-26 22:24:11 +0800619static int crypto_gcm_decrypt(struct aead_request *req)
620{
Herbert Xu6160b282007-12-04 19:17:50 +1100621 struct crypto_aead *aead = crypto_aead_reqtfm(req);
Herbert Xu25894692007-12-12 19:16:38 +0800622 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Huang Ying9382d972009-08-06 15:34:26 +1000623 struct ablkcipher_request *abreq = &pctx->u.abreq;
624 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
Herbert Xu6160b282007-12-04 19:17:50 +1100625 unsigned int authsize = crypto_aead_authsize(aead);
Huang Ying9382d972009-08-06 15:34:26 +1000626 unsigned int cryptlen = req->cryptlen;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800627 int err;
628
Herbert Xu6160b282007-12-04 19:17:50 +1100629 if (cryptlen < authsize)
Mikko Herranen28db8e32007-11-26 22:24:11 +0800630 return -EINVAL;
Herbert Xu6160b282007-12-04 19:17:50 +1100631 cryptlen -= authsize;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800632
Huang Ying9382d972009-08-06 15:34:26 +1000633 gctx->src = req->src;
634 gctx->cryptlen = cryptlen;
635 gctx->complete = gcm_dec_hash_done;
636
637 err = gcm_hash(req, pctx);
638 if (err)
639 return err;
640
Herbert Xu84c91152007-12-17 21:42:08 +0800641 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
Huang Ying9382d972009-08-06 15:34:26 +1000642 gcm_decrypt_done, req);
643 crypto_gcm_init_crypt(abreq, req, cryptlen);
Herbert Xu84c91152007-12-17 21:42:08 +0800644 err = crypto_ablkcipher_decrypt(abreq);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800645 if (err)
646 return err;
647
Huang Ying9382d972009-08-06 15:34:26 +1000648 return crypto_gcm_verify(req, pctx);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800649}
650
651static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
652{
653 struct crypto_instance *inst = (void *)tfm->__crt_alg;
654 struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst);
655 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
656 struct crypto_ablkcipher *ctr;
Huang Ying9382d972009-08-06 15:34:26 +1000657 struct crypto_ahash *ghash;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800658 unsigned long align;
659 int err;
660
Huang Ying9382d972009-08-06 15:34:26 +1000661 ghash = crypto_spawn_ahash(&ictx->ghash);
662 if (IS_ERR(ghash))
663 return PTR_ERR(ghash);
664
Herbert Xu1472e5e2007-12-07 19:26:11 +0800665 ctr = crypto_spawn_skcipher(&ictx->ctr);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800666 err = PTR_ERR(ctr);
667 if (IS_ERR(ctr))
Huang Ying9382d972009-08-06 15:34:26 +1000668 goto err_free_hash;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800669
670 ctx->ctr = ctr;
Huang Ying9382d972009-08-06 15:34:26 +1000671 ctx->ghash = ghash;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800672
Herbert Xu25894692007-12-12 19:16:38 +0800673 align = crypto_tfm_alg_alignmask(tfm);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800674 align &= ~(crypto_tfm_ctx_alignment() - 1);
Herbert Xu7f681372007-12-06 14:59:53 +0800675 tfm->crt_aead.reqsize = align +
Huang Ying9382d972009-08-06 15:34:26 +1000676 offsetof(struct crypto_gcm_req_priv_ctx, u) +
677 max(sizeof(struct ablkcipher_request) +
678 crypto_ablkcipher_reqsize(ctr),
679 sizeof(struct ahash_request) +
680 crypto_ahash_reqsize(ghash));
Mikko Herranen28db8e32007-11-26 22:24:11 +0800681
682 return 0;
Huang Ying9382d972009-08-06 15:34:26 +1000683
684err_free_hash:
685 crypto_free_ahash(ghash);
686 return err;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800687}
688
689static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
690{
691 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
692
Huang Ying9382d972009-08-06 15:34:26 +1000693 crypto_free_ahash(ctx->ghash);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800694 crypto_free_ablkcipher(ctx->ctr);
695}
696
Herbert Xud00aa192007-12-07 20:31:10 +0800697static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
698 const char *full_name,
Huang Ying9382d972009-08-06 15:34:26 +1000699 const char *ctr_name,
700 const char *ghash_name)
Mikko Herranen28db8e32007-11-26 22:24:11 +0800701{
Herbert Xud00aa192007-12-07 20:31:10 +0800702 struct crypto_attr_type *algt;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800703 struct crypto_instance *inst;
704 struct crypto_alg *ctr;
Huang Ying9382d972009-08-06 15:34:26 +1000705 struct crypto_alg *ghash_alg;
706 struct ahash_alg *ghash_ahash_alg;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800707 struct gcm_instance_ctx *ctx;
708 int err;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800709
Herbert Xud00aa192007-12-07 20:31:10 +0800710 algt = crypto_get_attr_type(tb);
Herbert Xud00aa192007-12-07 20:31:10 +0800711 if (IS_ERR(algt))
Julia Lawall3e8afe32013-01-22 12:29:26 +0100712 return ERR_CAST(algt);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800713
Herbert Xud00aa192007-12-07 20:31:10 +0800714 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
715 return ERR_PTR(-EINVAL);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800716
Huang Ying9382d972009-08-06 15:34:26 +1000717 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
718 CRYPTO_ALG_TYPE_HASH,
719 CRYPTO_ALG_TYPE_AHASH_MASK);
Huang Ying9382d972009-08-06 15:34:26 +1000720 if (IS_ERR(ghash_alg))
Julia Lawall3e8afe32013-01-22 12:29:26 +0100721 return ERR_CAST(ghash_alg);
Huang Ying9382d972009-08-06 15:34:26 +1000722
723 err = -ENOMEM;
Herbert Xu1472e5e2007-12-07 19:26:11 +0800724 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
725 if (!inst)
Huang Ying9382d972009-08-06 15:34:26 +1000726 goto out_put_ghash;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800727
Herbert Xu1472e5e2007-12-07 19:26:11 +0800728 ctx = crypto_instance_ctx(inst);
Huang Ying9382d972009-08-06 15:34:26 +1000729 ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base);
730 err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg,
731 inst);
732 if (err)
733 goto err_free_inst;
734
Herbert Xu1472e5e2007-12-07 19:26:11 +0800735 crypto_set_skcipher_spawn(&ctx->ctr, inst);
736 err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
737 crypto_requires_sync(algt->type,
738 algt->mask));
739 if (err)
Huang Ying9382d972009-08-06 15:34:26 +1000740 goto err_drop_ghash;
Herbert Xu1472e5e2007-12-07 19:26:11 +0800741
742 ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800743
Herbert Xud00aa192007-12-07 20:31:10 +0800744 /* We only support 16-byte blocks. */
Herbert Xu1472e5e2007-12-07 19:26:11 +0800745 if (ctr->cra_ablkcipher.ivsize != 16)
Herbert Xud00aa192007-12-07 20:31:10 +0800746 goto out_put_ctr;
747
748 /* Not a stream cipher? */
749 err = -EINVAL;
750 if (ctr->cra_blocksize != 1)
Mikko Herranen28db8e32007-11-26 22:24:11 +0800751 goto out_put_ctr;
752
Mikko Herranen28db8e32007-11-26 22:24:11 +0800753 err = -ENAMETOOLONG;
Herbert Xud00aa192007-12-07 20:31:10 +0800754 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
Huang Ying9382d972009-08-06 15:34:26 +1000755 "gcm_base(%s,%s)", ctr->cra_driver_name,
756 ghash_alg->cra_driver_name) >=
Herbert Xud00aa192007-12-07 20:31:10 +0800757 CRYPTO_MAX_ALG_NAME)
Herbert Xu1472e5e2007-12-07 19:26:11 +0800758 goto out_put_ctr;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800759
Herbert Xud00aa192007-12-07 20:31:10 +0800760 memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
761
Herbert Xu1472e5e2007-12-07 19:26:11 +0800762 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
763 inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800764 inst->alg.cra_priority = ctr->cra_priority;
Herbert Xud00aa192007-12-07 20:31:10 +0800765 inst->alg.cra_blocksize = 1;
Herbert Xu25894692007-12-12 19:16:38 +0800766 inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800767 inst->alg.cra_type = &crypto_aead_type;
Herbert Xu84c91152007-12-17 21:42:08 +0800768 inst->alg.cra_aead.ivsize = 16;
Herbert Xu7ba683a2007-12-02 18:49:21 +1100769 inst->alg.cra_aead.maxauthsize = 16;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800770 inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
771 inst->alg.cra_init = crypto_gcm_init_tfm;
772 inst->alg.cra_exit = crypto_gcm_exit_tfm;
773 inst->alg.cra_aead.setkey = crypto_gcm_setkey;
Herbert Xudadbc532007-12-17 15:33:17 +0800774 inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800775 inst->alg.cra_aead.encrypt = crypto_gcm_encrypt;
776 inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;
777
778out:
Huang Ying9382d972009-08-06 15:34:26 +1000779 crypto_mod_put(ghash_alg);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800780 return inst;
Herbert Xu1472e5e2007-12-07 19:26:11 +0800781
782out_put_ctr:
783 crypto_drop_skcipher(&ctx->ctr);
Huang Ying9382d972009-08-06 15:34:26 +1000784err_drop_ghash:
785 crypto_drop_ahash(&ctx->ghash);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800786err_free_inst:
787 kfree(inst);
Huang Ying9382d972009-08-06 15:34:26 +1000788out_put_ghash:
Mikko Herranen28db8e32007-11-26 22:24:11 +0800789 inst = ERR_PTR(err);
790 goto out;
791}
792
Herbert Xud00aa192007-12-07 20:31:10 +0800793static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
794{
Herbert Xud00aa192007-12-07 20:31:10 +0800795 const char *cipher_name;
796 char ctr_name[CRYPTO_MAX_ALG_NAME];
797 char full_name[CRYPTO_MAX_ALG_NAME];
798
799 cipher_name = crypto_attr_alg_name(tb[1]);
Herbert Xud00aa192007-12-07 20:31:10 +0800800 if (IS_ERR(cipher_name))
Julia Lawall3e8afe32013-01-22 12:29:26 +0100801 return ERR_CAST(cipher_name);
Herbert Xud00aa192007-12-07 20:31:10 +0800802
803 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
804 CRYPTO_MAX_ALG_NAME)
805 return ERR_PTR(-ENAMETOOLONG);
806
807 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
808 CRYPTO_MAX_ALG_NAME)
809 return ERR_PTR(-ENAMETOOLONG);
810
Huang Ying9382d972009-08-06 15:34:26 +1000811 return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash");
Herbert Xud00aa192007-12-07 20:31:10 +0800812}
813
Mikko Herranen28db8e32007-11-26 22:24:11 +0800814static void crypto_gcm_free(struct crypto_instance *inst)
815{
816 struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
817
Herbert Xu1472e5e2007-12-07 19:26:11 +0800818 crypto_drop_skcipher(&ctx->ctr);
Huang Ying9382d972009-08-06 15:34:26 +1000819 crypto_drop_ahash(&ctx->ghash);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800820 kfree(inst);
821}
822
823static struct crypto_template crypto_gcm_tmpl = {
824 .name = "gcm",
825 .alloc = crypto_gcm_alloc,
826 .free = crypto_gcm_free,
827 .module = THIS_MODULE,
828};
829
Herbert Xud00aa192007-12-07 20:31:10 +0800830static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
831{
Herbert Xud00aa192007-12-07 20:31:10 +0800832 const char *ctr_name;
Huang Ying9382d972009-08-06 15:34:26 +1000833 const char *ghash_name;
Herbert Xud00aa192007-12-07 20:31:10 +0800834 char full_name[CRYPTO_MAX_ALG_NAME];
835
836 ctr_name = crypto_attr_alg_name(tb[1]);
Herbert Xud00aa192007-12-07 20:31:10 +0800837 if (IS_ERR(ctr_name))
Julia Lawall3e8afe32013-01-22 12:29:26 +0100838 return ERR_CAST(ctr_name);
Herbert Xud00aa192007-12-07 20:31:10 +0800839
Huang Ying9382d972009-08-06 15:34:26 +1000840 ghash_name = crypto_attr_alg_name(tb[2]);
Huang Ying9382d972009-08-06 15:34:26 +1000841 if (IS_ERR(ghash_name))
Julia Lawall3e8afe32013-01-22 12:29:26 +0100842 return ERR_CAST(ghash_name);
Huang Ying9382d972009-08-06 15:34:26 +1000843
844 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
845 ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
Herbert Xud00aa192007-12-07 20:31:10 +0800846 return ERR_PTR(-ENAMETOOLONG);
847
Huang Ying9382d972009-08-06 15:34:26 +1000848 return crypto_gcm_alloc_common(tb, full_name, ctr_name, ghash_name);
Herbert Xud00aa192007-12-07 20:31:10 +0800849}
850
851static struct crypto_template crypto_gcm_base_tmpl = {
852 .name = "gcm_base",
853 .alloc = crypto_gcm_base_alloc,
854 .free = crypto_gcm_free,
855 .module = THIS_MODULE,
856};
857
Herbert Xudadbc532007-12-17 15:33:17 +0800858static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
859 unsigned int keylen)
860{
861 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
862 struct crypto_aead *child = ctx->child;
863 int err;
864
865 if (keylen < 4)
866 return -EINVAL;
867
868 keylen -= 4;
869 memcpy(ctx->nonce, key + keylen, 4);
870
871 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
872 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
873 CRYPTO_TFM_REQ_MASK);
874 err = crypto_aead_setkey(child, key, keylen);
875 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
876 CRYPTO_TFM_RES_MASK);
877
878 return err;
879}
880
881static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
882 unsigned int authsize)
883{
884 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
885
886 switch (authsize) {
887 case 8:
888 case 12:
889 case 16:
890 break;
891 default:
892 return -EINVAL;
893 }
894
895 return crypto_aead_setauthsize(ctx->child, authsize);
896}
897
898static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
899{
900 struct aead_request *subreq = aead_request_ctx(req);
901 struct crypto_aead *aead = crypto_aead_reqtfm(req);
902 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
903 struct crypto_aead *child = ctx->child;
904 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
905 crypto_aead_alignmask(child) + 1);
906
907 memcpy(iv, ctx->nonce, 4);
908 memcpy(iv + 4, req->iv, 8);
909
910 aead_request_set_tfm(subreq, child);
911 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
912 req->base.data);
913 aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv);
914 aead_request_set_assoc(subreq, req->assoc, req->assoclen);
915
916 return subreq;
917}
918
919static int crypto_rfc4106_encrypt(struct aead_request *req)
920{
921 req = crypto_rfc4106_crypt(req);
922
923 return crypto_aead_encrypt(req);
924}
925
926static int crypto_rfc4106_decrypt(struct aead_request *req)
927{
928 req = crypto_rfc4106_crypt(req);
929
930 return crypto_aead_decrypt(req);
931}
932
933static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm)
934{
935 struct crypto_instance *inst = (void *)tfm->__crt_alg;
936 struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
937 struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
938 struct crypto_aead *aead;
939 unsigned long align;
940
941 aead = crypto_spawn_aead(spawn);
942 if (IS_ERR(aead))
943 return PTR_ERR(aead);
944
945 ctx->child = aead;
946
947 align = crypto_aead_alignmask(aead);
948 align &= ~(crypto_tfm_ctx_alignment() - 1);
949 tfm->crt_aead.reqsize = sizeof(struct aead_request) +
950 ALIGN(crypto_aead_reqsize(aead),
951 crypto_tfm_ctx_alignment()) +
952 align + 16;
953
954 return 0;
955}
956
957static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm)
958{
959 struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
960
961 crypto_free_aead(ctx->child);
962}
963
964static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb)
965{
966 struct crypto_attr_type *algt;
967 struct crypto_instance *inst;
968 struct crypto_aead_spawn *spawn;
969 struct crypto_alg *alg;
970 const char *ccm_name;
971 int err;
972
973 algt = crypto_get_attr_type(tb);
Herbert Xudadbc532007-12-17 15:33:17 +0800974 if (IS_ERR(algt))
Julia Lawall3e8afe32013-01-22 12:29:26 +0100975 return ERR_CAST(algt);
Herbert Xudadbc532007-12-17 15:33:17 +0800976
977 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
978 return ERR_PTR(-EINVAL);
979
980 ccm_name = crypto_attr_alg_name(tb[1]);
Herbert Xudadbc532007-12-17 15:33:17 +0800981 if (IS_ERR(ccm_name))
Julia Lawall3e8afe32013-01-22 12:29:26 +0100982 return ERR_CAST(ccm_name);
Herbert Xudadbc532007-12-17 15:33:17 +0800983
984 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
985 if (!inst)
986 return ERR_PTR(-ENOMEM);
987
988 spawn = crypto_instance_ctx(inst);
989 crypto_set_aead_spawn(spawn, inst);
990 err = crypto_grab_aead(spawn, ccm_name, 0,
991 crypto_requires_sync(algt->type, algt->mask));
992 if (err)
993 goto out_free_inst;
994
995 alg = crypto_aead_spawn_alg(spawn);
996
997 err = -EINVAL;
998
999 /* We only support 16-byte blocks. */
1000 if (alg->cra_aead.ivsize != 16)
1001 goto out_drop_alg;
1002
1003 /* Not a stream cipher? */
1004 if (alg->cra_blocksize != 1)
1005 goto out_drop_alg;
1006
1007 err = -ENAMETOOLONG;
1008 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1009 "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1010 snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1011 "rfc4106(%s)", alg->cra_driver_name) >=
1012 CRYPTO_MAX_ALG_NAME)
1013 goto out_drop_alg;
1014
1015 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1016 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1017 inst->alg.cra_priority = alg->cra_priority;
1018 inst->alg.cra_blocksize = 1;
1019 inst->alg.cra_alignmask = alg->cra_alignmask;
1020 inst->alg.cra_type = &crypto_nivaead_type;
1021
1022 inst->alg.cra_aead.ivsize = 8;
1023 inst->alg.cra_aead.maxauthsize = 16;
1024
1025 inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
1026
1027 inst->alg.cra_init = crypto_rfc4106_init_tfm;
1028 inst->alg.cra_exit = crypto_rfc4106_exit_tfm;
1029
1030 inst->alg.cra_aead.setkey = crypto_rfc4106_setkey;
1031 inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize;
1032 inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt;
1033 inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt;
1034
1035 inst->alg.cra_aead.geniv = "seqiv";
1036
1037out:
1038 return inst;
1039
1040out_drop_alg:
1041 crypto_drop_aead(spawn);
1042out_free_inst:
1043 kfree(inst);
1044 inst = ERR_PTR(err);
1045 goto out;
1046}
1047
1048static void crypto_rfc4106_free(struct crypto_instance *inst)
1049{
1050 crypto_drop_spawn(crypto_instance_ctx(inst));
1051 kfree(inst);
1052}
1053
1054static struct crypto_template crypto_rfc4106_tmpl = {
1055 .name = "rfc4106",
1056 .alloc = crypto_rfc4106_alloc,
1057 .free = crypto_rfc4106_free,
1058 .module = THIS_MODULE,
1059};
1060
Tobias Brunner73c89c12010-01-17 21:52:11 +11001061static inline struct crypto_rfc4543_req_ctx *crypto_rfc4543_reqctx(
1062 struct aead_request *req)
1063{
1064 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
1065
1066 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
1067}
1068
1069static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1070 unsigned int keylen)
1071{
1072 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1073 struct crypto_aead *child = ctx->child;
1074 int err;
1075
1076 if (keylen < 4)
1077 return -EINVAL;
1078
1079 keylen -= 4;
1080 memcpy(ctx->nonce, key + keylen, 4);
1081
1082 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1083 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1084 CRYPTO_TFM_REQ_MASK);
1085 err = crypto_aead_setkey(child, key, keylen);
1086 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1087 CRYPTO_TFM_RES_MASK);
1088
1089 return err;
1090}
1091
1092static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1093 unsigned int authsize)
1094{
1095 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1096
1097 if (authsize != 16)
1098 return -EINVAL;
1099
1100 return crypto_aead_setauthsize(ctx->child, authsize);
1101}
1102
Jussi Kivilinnad733ac92013-04-07 16:43:46 +03001103static void crypto_rfc4543_done(struct crypto_async_request *areq, int err)
1104{
1105 struct aead_request *req = areq->data;
1106 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1107 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1108
1109 if (!err) {
1110 scatterwalk_map_and_copy(rctx->auth_tag, req->dst,
1111 req->cryptlen,
1112 crypto_aead_authsize(aead), 1);
1113 }
1114
1115 aead_request_complete(req, err);
1116}
1117
Tobias Brunner73c89c12010-01-17 21:52:11 +11001118static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001119 bool enc)
Tobias Brunner73c89c12010-01-17 21:52:11 +11001120{
1121 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1122 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1123 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1124 struct aead_request *subreq = &rctx->subreq;
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001125 struct scatterlist *src = req->src;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001126 struct scatterlist *cipher = rctx->cipher;
1127 struct scatterlist *payload = rctx->payload;
1128 struct scatterlist *assoc = rctx->assoc;
1129 unsigned int authsize = crypto_aead_authsize(aead);
1130 unsigned int assoclen = req->assoclen;
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001131 struct page *srcp;
1132 u8 *vsrc;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001133 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1134 crypto_aead_alignmask(ctx->child) + 1);
1135
1136 memcpy(iv, ctx->nonce, 4);
1137 memcpy(iv + 4, req->iv, 8);
1138
1139 /* construct cipher/plaintext */
1140 if (enc)
1141 memset(rctx->auth_tag, 0, authsize);
1142 else
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001143 scatterwalk_map_and_copy(rctx->auth_tag, src,
Tobias Brunner73c89c12010-01-17 21:52:11 +11001144 req->cryptlen - authsize,
1145 authsize, 0);
1146
1147 sg_init_one(cipher, rctx->auth_tag, authsize);
1148
1149 /* construct the aad */
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001150 srcp = sg_page(src);
1151 vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001152
1153 sg_init_table(payload, 2);
1154 sg_set_buf(payload, req->iv, 8);
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001155 scatterwalk_crypto_chain(payload, src, vsrc == req->iv + 8, 2);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001156 assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
1157
Jussi Kivilinnad3dde522013-03-28 21:54:03 +02001158 if (req->assoc->length == req->assoclen) {
1159 sg_init_table(assoc, 2);
1160 sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
1161 req->assoc->offset);
1162 } else {
1163 BUG_ON(req->assoclen > sizeof(rctx->assocbuf));
1164
1165 scatterwalk_map_and_copy(rctx->assocbuf, req->assoc, 0,
1166 req->assoclen, 0);
1167
1168 sg_init_table(assoc, 2);
1169 sg_set_buf(assoc, rctx->assocbuf, req->assoclen);
1170 }
Steffen Klassertc920fa62010-11-22 11:26:54 +01001171 scatterwalk_crypto_chain(assoc, payload, 0, 2);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001172
1173 aead_request_set_tfm(subreq, ctx->child);
Jussi Kivilinnad733ac92013-04-07 16:43:46 +03001174 aead_request_set_callback(subreq, req->base.flags, crypto_rfc4543_done,
1175 req);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001176 aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
1177 aead_request_set_assoc(subreq, assoc, assoclen);
1178
1179 return subreq;
1180}
1181
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001182static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1183{
1184 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1185 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1186 unsigned int authsize = crypto_aead_authsize(aead);
1187 unsigned int nbytes = req->cryptlen - (enc ? 0 : authsize);
1188 struct blkcipher_desc desc = {
1189 .tfm = ctx->null,
1190 };
1191
1192 return crypto_blkcipher_encrypt(&desc, req->dst, req->src, nbytes);
1193}
1194
Tobias Brunner73c89c12010-01-17 21:52:11 +11001195static int crypto_rfc4543_encrypt(struct aead_request *req)
1196{
1197 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1198 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1199 struct aead_request *subreq;
1200 int err;
1201
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001202 if (req->src != req->dst) {
1203 err = crypto_rfc4543_copy_src_to_dst(req, true);
1204 if (err)
1205 return err;
1206 }
1207
1208 subreq = crypto_rfc4543_crypt(req, true);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001209 err = crypto_aead_encrypt(subreq);
1210 if (err)
1211 return err;
1212
1213 scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen,
1214 crypto_aead_authsize(aead), 1);
1215
1216 return 0;
1217}
1218
1219static int crypto_rfc4543_decrypt(struct aead_request *req)
1220{
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001221 int err;
1222
1223 if (req->src != req->dst) {
1224 err = crypto_rfc4543_copy_src_to_dst(req, false);
1225 if (err)
1226 return err;
1227 }
1228
1229 req = crypto_rfc4543_crypt(req, false);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001230
1231 return crypto_aead_decrypt(req);
1232}
1233
1234static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm)
1235{
1236 struct crypto_instance *inst = (void *)tfm->__crt_alg;
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001237 struct crypto_rfc4543_instance_ctx *ictx = crypto_instance_ctx(inst);
1238 struct crypto_aead_spawn *spawn = &ictx->aead;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001239 struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1240 struct crypto_aead *aead;
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001241 struct crypto_blkcipher *null;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001242 unsigned long align;
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001243 int err = 0;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001244
1245 aead = crypto_spawn_aead(spawn);
1246 if (IS_ERR(aead))
1247 return PTR_ERR(aead);
1248
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001249 null = crypto_spawn_blkcipher(&ictx->null.base);
1250 err = PTR_ERR(null);
1251 if (IS_ERR(null))
1252 goto err_free_aead;
1253
Tobias Brunner73c89c12010-01-17 21:52:11 +11001254 ctx->child = aead;
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001255 ctx->null = null;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001256
1257 align = crypto_aead_alignmask(aead);
1258 align &= ~(crypto_tfm_ctx_alignment() - 1);
1259 tfm->crt_aead.reqsize = sizeof(struct crypto_rfc4543_req_ctx) +
1260 ALIGN(crypto_aead_reqsize(aead),
1261 crypto_tfm_ctx_alignment()) +
1262 align + 16;
1263
1264 return 0;
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001265
1266err_free_aead:
1267 crypto_free_aead(aead);
1268 return err;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001269}
1270
1271static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
1272{
1273 struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1274
1275 crypto_free_aead(ctx->child);
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001276 crypto_free_blkcipher(ctx->null);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001277}
1278
1279static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
1280{
1281 struct crypto_attr_type *algt;
1282 struct crypto_instance *inst;
1283 struct crypto_aead_spawn *spawn;
1284 struct crypto_alg *alg;
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001285 struct crypto_rfc4543_instance_ctx *ctx;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001286 const char *ccm_name;
1287 int err;
1288
1289 algt = crypto_get_attr_type(tb);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001290 if (IS_ERR(algt))
Julia Lawall3e8afe32013-01-22 12:29:26 +01001291 return ERR_CAST(algt);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001292
1293 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1294 return ERR_PTR(-EINVAL);
1295
1296 ccm_name = crypto_attr_alg_name(tb[1]);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001297 if (IS_ERR(ccm_name))
Julia Lawall3e8afe32013-01-22 12:29:26 +01001298 return ERR_CAST(ccm_name);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001299
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001300 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001301 if (!inst)
1302 return ERR_PTR(-ENOMEM);
1303
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001304 ctx = crypto_instance_ctx(inst);
1305 spawn = &ctx->aead;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001306 crypto_set_aead_spawn(spawn, inst);
1307 err = crypto_grab_aead(spawn, ccm_name, 0,
1308 crypto_requires_sync(algt->type, algt->mask));
1309 if (err)
1310 goto out_free_inst;
1311
1312 alg = crypto_aead_spawn_alg(spawn);
1313
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001314 crypto_set_skcipher_spawn(&ctx->null, inst);
1315 err = crypto_grab_skcipher(&ctx->null, "ecb(cipher_null)", 0,
1316 CRYPTO_ALG_ASYNC);
1317 if (err)
1318 goto out_drop_alg;
1319
1320 crypto_skcipher_spawn_alg(&ctx->null);
1321
Tobias Brunner73c89c12010-01-17 21:52:11 +11001322 err = -EINVAL;
1323
1324 /* We only support 16-byte blocks. */
1325 if (alg->cra_aead.ivsize != 16)
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001326 goto out_drop_ecbnull;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001327
1328 /* Not a stream cipher? */
1329 if (alg->cra_blocksize != 1)
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001330 goto out_drop_ecbnull;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001331
1332 err = -ENAMETOOLONG;
1333 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1334 "rfc4543(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1335 snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1336 "rfc4543(%s)", alg->cra_driver_name) >=
1337 CRYPTO_MAX_ALG_NAME)
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001338 goto out_drop_ecbnull;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001339
1340 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1341 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1342 inst->alg.cra_priority = alg->cra_priority;
1343 inst->alg.cra_blocksize = 1;
1344 inst->alg.cra_alignmask = alg->cra_alignmask;
1345 inst->alg.cra_type = &crypto_nivaead_type;
1346
1347 inst->alg.cra_aead.ivsize = 8;
1348 inst->alg.cra_aead.maxauthsize = 16;
1349
1350 inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1351
1352 inst->alg.cra_init = crypto_rfc4543_init_tfm;
1353 inst->alg.cra_exit = crypto_rfc4543_exit_tfm;
1354
1355 inst->alg.cra_aead.setkey = crypto_rfc4543_setkey;
1356 inst->alg.cra_aead.setauthsize = crypto_rfc4543_setauthsize;
1357 inst->alg.cra_aead.encrypt = crypto_rfc4543_encrypt;
1358 inst->alg.cra_aead.decrypt = crypto_rfc4543_decrypt;
1359
1360 inst->alg.cra_aead.geniv = "seqiv";
1361
1362out:
1363 return inst;
1364
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001365out_drop_ecbnull:
1366 crypto_drop_skcipher(&ctx->null);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001367out_drop_alg:
1368 crypto_drop_aead(spawn);
1369out_free_inst:
1370 kfree(inst);
1371 inst = ERR_PTR(err);
1372 goto out;
1373}
1374
1375static void crypto_rfc4543_free(struct crypto_instance *inst)
1376{
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001377 struct crypto_rfc4543_instance_ctx *ctx = crypto_instance_ctx(inst);
1378
1379 crypto_drop_aead(&ctx->aead);
1380 crypto_drop_skcipher(&ctx->null);
1381
Tobias Brunner73c89c12010-01-17 21:52:11 +11001382 kfree(inst);
1383}
1384
1385static struct crypto_template crypto_rfc4543_tmpl = {
1386 .name = "rfc4543",
1387 .alloc = crypto_rfc4543_alloc,
1388 .free = crypto_rfc4543_free,
1389 .module = THIS_MODULE,
1390};
1391
Mikko Herranen28db8e32007-11-26 22:24:11 +08001392static int __init crypto_gcm_module_init(void)
1393{
Herbert Xud00aa192007-12-07 20:31:10 +08001394 int err;
1395
Huang Ying9382d972009-08-06 15:34:26 +10001396 gcm_zeroes = kzalloc(16, GFP_KERNEL);
1397 if (!gcm_zeroes)
1398 return -ENOMEM;
1399
Herbert Xud00aa192007-12-07 20:31:10 +08001400 err = crypto_register_template(&crypto_gcm_base_tmpl);
1401 if (err)
1402 goto out;
1403
1404 err = crypto_register_template(&crypto_gcm_tmpl);
1405 if (err)
1406 goto out_undo_base;
1407
Herbert Xudadbc532007-12-17 15:33:17 +08001408 err = crypto_register_template(&crypto_rfc4106_tmpl);
1409 if (err)
1410 goto out_undo_gcm;
1411
Tobias Brunner73c89c12010-01-17 21:52:11 +11001412 err = crypto_register_template(&crypto_rfc4543_tmpl);
1413 if (err)
1414 goto out_undo_rfc4106;
1415
Huang Ying9382d972009-08-06 15:34:26 +10001416 return 0;
Herbert Xud00aa192007-12-07 20:31:10 +08001417
Tobias Brunner73c89c12010-01-17 21:52:11 +11001418out_undo_rfc4106:
1419 crypto_unregister_template(&crypto_rfc4106_tmpl);
Herbert Xudadbc532007-12-17 15:33:17 +08001420out_undo_gcm:
1421 crypto_unregister_template(&crypto_gcm_tmpl);
Herbert Xud00aa192007-12-07 20:31:10 +08001422out_undo_base:
1423 crypto_unregister_template(&crypto_gcm_base_tmpl);
Huang Ying9382d972009-08-06 15:34:26 +10001424out:
1425 kfree(gcm_zeroes);
1426 return err;
Mikko Herranen28db8e32007-11-26 22:24:11 +08001427}
1428
1429static void __exit crypto_gcm_module_exit(void)
1430{
Huang Ying9382d972009-08-06 15:34:26 +10001431 kfree(gcm_zeroes);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001432 crypto_unregister_template(&crypto_rfc4543_tmpl);
Herbert Xudadbc532007-12-17 15:33:17 +08001433 crypto_unregister_template(&crypto_rfc4106_tmpl);
Mikko Herranen28db8e32007-11-26 22:24:11 +08001434 crypto_unregister_template(&crypto_gcm_tmpl);
Herbert Xud00aa192007-12-07 20:31:10 +08001435 crypto_unregister_template(&crypto_gcm_base_tmpl);
Mikko Herranen28db8e32007-11-26 22:24:11 +08001436}
1437
1438module_init(crypto_gcm_module_init);
1439module_exit(crypto_gcm_module_exit);
1440
1441MODULE_LICENSE("GPL");
1442MODULE_DESCRIPTION("Galois/Counter Mode");
1443MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
Kees Cook5d26a102014-11-20 17:05:53 -08001444MODULE_ALIAS_CRYPTO("gcm_base");
1445MODULE_ALIAS_CRYPTO("rfc4106");
1446MODULE_ALIAS_CRYPTO("rfc4543");
Kees Cook4943ba12014-11-24 16:32:38 -08001447MODULE_ALIAS_CRYPTO("gcm");