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Joy Latten4a49b492007-12-12 20:25:13 +08001/*
2 * CCM: Counter with CBC-MAC
3 *
4 * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
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 as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <crypto/internal/aead.h>
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +000014#include <crypto/internal/hash.h>
Joy Latten4a49b492007-12-12 20:25:13 +080015#include <crypto/internal/skcipher.h>
16#include <crypto/scatterwalk.h>
17#include <linux/err.h>
18#include <linux/init.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/slab.h>
22
23#include "internal.h"
24
25struct ccm_instance_ctx {
26 struct crypto_skcipher_spawn ctr;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +000027 struct crypto_ahash_spawn mac;
Joy Latten4a49b492007-12-12 20:25:13 +080028};
29
30struct crypto_ccm_ctx {
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +000031 struct crypto_ahash *mac;
Herbert Xu464b93a2016-07-12 13:17:38 +080032 struct crypto_skcipher *ctr;
Joy Latten4a49b492007-12-12 20:25:13 +080033};
34
35struct crypto_rfc4309_ctx {
36 struct crypto_aead *child;
37 u8 nonce[3];
38};
39
Herbert Xu81c4c352015-07-14 16:53:18 +080040struct crypto_rfc4309_req_ctx {
41 struct scatterlist src[3];
42 struct scatterlist dst[3];
43 struct aead_request subreq;
44};
45
Joy Latten4a49b492007-12-12 20:25:13 +080046struct crypto_ccm_req_priv_ctx {
47 u8 odata[16];
Ard Biesheuvel3b304602017-02-27 15:30:56 +000048 u8 idata[16];
Joy Latten4a49b492007-12-12 20:25:13 +080049 u8 auth_tag[16];
Joy Latten4a49b492007-12-12 20:25:13 +080050 u32 flags;
Herbert Xu81c4c352015-07-14 16:53:18 +080051 struct scatterlist src[3];
52 struct scatterlist dst[3];
Herbert Xu464b93a2016-07-12 13:17:38 +080053 struct skcipher_request skreq;
Joy Latten4a49b492007-12-12 20:25:13 +080054};
55
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +000056struct cbcmac_tfm_ctx {
57 struct crypto_cipher *child;
58};
59
60struct cbcmac_desc_ctx {
61 unsigned int len;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +000062};
63
Joy Latten4a49b492007-12-12 20:25:13 +080064static inline struct crypto_ccm_req_priv_ctx *crypto_ccm_reqctx(
65 struct aead_request *req)
66{
67 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
68
69 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
70}
71
72static int set_msg_len(u8 *block, unsigned int msglen, int csize)
73{
74 __be32 data;
75
76 memset(block, 0, csize);
77 block += csize;
78
79 if (csize >= 4)
80 csize = 4;
81 else if (msglen > (1 << (8 * csize)))
82 return -EOVERFLOW;
83
84 data = cpu_to_be32(msglen);
85 memcpy(block - csize, (u8 *)&data + 4 - csize, csize);
86
87 return 0;
88}
89
90static int crypto_ccm_setkey(struct crypto_aead *aead, const u8 *key,
91 unsigned int keylen)
92{
93 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
Herbert Xu464b93a2016-07-12 13:17:38 +080094 struct crypto_skcipher *ctr = ctx->ctr;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +000095 struct crypto_ahash *mac = ctx->mac;
Joy Latten4a49b492007-12-12 20:25:13 +080096 int err = 0;
97
Herbert Xu464b93a2016-07-12 13:17:38 +080098 crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
99 crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
100 CRYPTO_TFM_REQ_MASK);
101 err = crypto_skcipher_setkey(ctr, key, keylen);
102 crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) &
Joy Latten4a49b492007-12-12 20:25:13 +0800103 CRYPTO_TFM_RES_MASK);
104 if (err)
105 goto out;
106
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000107 crypto_ahash_clear_flags(mac, CRYPTO_TFM_REQ_MASK);
108 crypto_ahash_set_flags(mac, crypto_aead_get_flags(aead) &
Joy Latten4a49b492007-12-12 20:25:13 +0800109 CRYPTO_TFM_REQ_MASK);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000110 err = crypto_ahash_setkey(mac, key, keylen);
111 crypto_aead_set_flags(aead, crypto_ahash_get_flags(mac) &
Joy Latten4a49b492007-12-12 20:25:13 +0800112 CRYPTO_TFM_RES_MASK);
113
114out:
115 return err;
116}
117
118static int crypto_ccm_setauthsize(struct crypto_aead *tfm,
119 unsigned int authsize)
120{
121 switch (authsize) {
122 case 4:
123 case 6:
124 case 8:
125 case 10:
126 case 12:
127 case 14:
128 case 16:
129 break;
130 default:
131 return -EINVAL;
132 }
133
134 return 0;
135}
136
137static int format_input(u8 *info, struct aead_request *req,
138 unsigned int cryptlen)
139{
140 struct crypto_aead *aead = crypto_aead_reqtfm(req);
141 unsigned int lp = req->iv[0];
142 unsigned int l = lp + 1;
143 unsigned int m;
144
145 m = crypto_aead_authsize(aead);
146
147 memcpy(info, req->iv, 16);
148
149 /* format control info per RFC 3610 and
150 * NIST Special Publication 800-38C
151 */
152 *info |= (8 * ((m - 2) / 2));
153 if (req->assoclen)
154 *info |= 64;
155
156 return set_msg_len(info + 16 - l, cryptlen, l);
157}
158
159static int format_adata(u8 *adata, unsigned int a)
160{
161 int len = 0;
162
163 /* add control info for associated data
164 * RFC 3610 and NIST Special Publication 800-38C
165 */
166 if (a < 65280) {
167 *(__be16 *)adata = cpu_to_be16(a);
168 len = 2;
169 } else {
170 *(__be16 *)adata = cpu_to_be16(0xfffe);
171 *(__be32 *)&adata[2] = cpu_to_be32(a);
172 len = 6;
173 }
174
175 return len;
176}
177
Joy Latten4a49b492007-12-12 20:25:13 +0800178static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain,
179 unsigned int cryptlen)
180{
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000181 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
Joy Latten4a49b492007-12-12 20:25:13 +0800182 struct crypto_aead *aead = crypto_aead_reqtfm(req);
183 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000184 AHASH_REQUEST_ON_STACK(ahreq, ctx->mac);
Joy Latten4a49b492007-12-12 20:25:13 +0800185 unsigned int assoclen = req->assoclen;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000186 struct scatterlist sg[3];
Ard Biesheuvel3b304602017-02-27 15:30:56 +0000187 u8 *odata = pctx->odata;
188 u8 *idata = pctx->idata;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000189 int ilen, err;
Joy Latten4a49b492007-12-12 20:25:13 +0800190
191 /* format control data for input */
192 err = format_input(odata, req, cryptlen);
193 if (err)
194 goto out;
195
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000196 sg_init_table(sg, 3);
197 sg_set_buf(&sg[0], odata, 16);
Joy Latten4a49b492007-12-12 20:25:13 +0800198
199 /* format associated data and compute into mac */
200 if (assoclen) {
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000201 ilen = format_adata(idata, assoclen);
202 sg_set_buf(&sg[1], idata, ilen);
203 sg_chain(sg, 3, req->src);
Jarod Wilson516280e2009-01-22 19:58:15 +1100204 } else {
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000205 ilen = 0;
206 sg_chain(sg, 2, req->src);
Joy Latten4a49b492007-12-12 20:25:13 +0800207 }
208
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000209 ahash_request_set_tfm(ahreq, ctx->mac);
210 ahash_request_set_callback(ahreq, pctx->flags, NULL, NULL);
211 ahash_request_set_crypt(ahreq, sg, NULL, assoclen + ilen + 16);
212 err = crypto_ahash_init(ahreq);
213 if (err)
214 goto out;
215 err = crypto_ahash_update(ahreq);
216 if (err)
217 goto out;
Joy Latten4a49b492007-12-12 20:25:13 +0800218
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000219 /* we need to pad the MAC input to a round multiple of the block size */
220 ilen = 16 - (assoclen + ilen) % 16;
221 if (ilen < 16) {
222 memset(idata, 0, ilen);
223 sg_init_table(sg, 2);
224 sg_set_buf(&sg[0], idata, ilen);
225 if (plain)
226 sg_chain(sg, 2, plain);
227 plain = sg;
228 cryptlen += ilen;
229 }
230
231 ahash_request_set_crypt(ahreq, plain, pctx->odata, cryptlen);
232 err = crypto_ahash_finup(ahreq);
Joy Latten4a49b492007-12-12 20:25:13 +0800233out:
234 return err;
235}
236
237static void crypto_ccm_encrypt_done(struct crypto_async_request *areq, int err)
238{
239 struct aead_request *req = areq->data;
240 struct crypto_aead *aead = crypto_aead_reqtfm(req);
241 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
242 u8 *odata = pctx->odata;
243
244 if (!err)
Herbert Xu81c4c352015-07-14 16:53:18 +0800245 scatterwalk_map_and_copy(odata, req->dst,
246 req->assoclen + req->cryptlen,
Joy Latten4a49b492007-12-12 20:25:13 +0800247 crypto_aead_authsize(aead), 1);
248 aead_request_complete(req, err);
249}
250
251static inline int crypto_ccm_check_iv(const u8 *iv)
252{
253 /* 2 <= L <= 8, so 1 <= L' <= 7. */
254 if (1 > iv[0] || iv[0] > 7)
255 return -EINVAL;
256
257 return 0;
258}
259
Herbert Xu81c4c352015-07-14 16:53:18 +0800260static int crypto_ccm_init_crypt(struct aead_request *req, u8 *tag)
261{
262 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
263 struct scatterlist *sg;
264 u8 *iv = req->iv;
265 int err;
266
267 err = crypto_ccm_check_iv(iv);
268 if (err)
269 return err;
270
271 pctx->flags = aead_request_flags(req);
272
273 /* Note: rfc 3610 and NIST 800-38C require counter of
274 * zero to encrypt auth tag.
275 */
276 memset(iv + 15 - iv[0], 0, iv[0] + 1);
277
278 sg_init_table(pctx->src, 3);
279 sg_set_buf(pctx->src, tag, 16);
280 sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
281 if (sg != pctx->src + 1)
282 sg_chain(pctx->src, 2, sg);
283
284 if (req->src != req->dst) {
285 sg_init_table(pctx->dst, 3);
286 sg_set_buf(pctx->dst, tag, 16);
287 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
288 if (sg != pctx->dst + 1)
289 sg_chain(pctx->dst, 2, sg);
290 }
291
292 return 0;
293}
294
Joy Latten4a49b492007-12-12 20:25:13 +0800295static int crypto_ccm_encrypt(struct aead_request *req)
296{
297 struct crypto_aead *aead = crypto_aead_reqtfm(req);
298 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
299 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
Herbert Xu464b93a2016-07-12 13:17:38 +0800300 struct skcipher_request *skreq = &pctx->skreq;
Joy Latten4a49b492007-12-12 20:25:13 +0800301 struct scatterlist *dst;
302 unsigned int cryptlen = req->cryptlen;
303 u8 *odata = pctx->odata;
304 u8 *iv = req->iv;
305 int err;
306
Herbert Xu81c4c352015-07-14 16:53:18 +0800307 err = crypto_ccm_init_crypt(req, odata);
Joy Latten4a49b492007-12-12 20:25:13 +0800308 if (err)
309 return err;
310
Herbert Xu81c4c352015-07-14 16:53:18 +0800311 err = crypto_ccm_auth(req, sg_next(pctx->src), cryptlen);
Joy Latten4a49b492007-12-12 20:25:13 +0800312 if (err)
313 return err;
314
Joy Latten4a49b492007-12-12 20:25:13 +0800315 dst = pctx->src;
Herbert Xu81c4c352015-07-14 16:53:18 +0800316 if (req->src != req->dst)
Joy Latten4a49b492007-12-12 20:25:13 +0800317 dst = pctx->dst;
Joy Latten4a49b492007-12-12 20:25:13 +0800318
Herbert Xu464b93a2016-07-12 13:17:38 +0800319 skcipher_request_set_tfm(skreq, ctx->ctr);
320 skcipher_request_set_callback(skreq, pctx->flags,
321 crypto_ccm_encrypt_done, req);
322 skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv);
323 err = crypto_skcipher_encrypt(skreq);
Joy Latten4a49b492007-12-12 20:25:13 +0800324 if (err)
325 return err;
326
327 /* copy authtag to end of dst */
Herbert Xu81c4c352015-07-14 16:53:18 +0800328 scatterwalk_map_and_copy(odata, sg_next(dst), cryptlen,
Joy Latten4a49b492007-12-12 20:25:13 +0800329 crypto_aead_authsize(aead), 1);
330 return err;
331}
332
333static void crypto_ccm_decrypt_done(struct crypto_async_request *areq,
334 int err)
335{
336 struct aead_request *req = areq->data;
337 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
338 struct crypto_aead *aead = crypto_aead_reqtfm(req);
339 unsigned int authsize = crypto_aead_authsize(aead);
340 unsigned int cryptlen = req->cryptlen - authsize;
Herbert Xu81c4c352015-07-14 16:53:18 +0800341 struct scatterlist *dst;
342
343 pctx->flags = 0;
344
345 dst = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
Joy Latten4a49b492007-12-12 20:25:13 +0800346
347 if (!err) {
Herbert Xu81c4c352015-07-14 16:53:18 +0800348 err = crypto_ccm_auth(req, dst, cryptlen);
James Yonan6bf37e52013-09-26 02:20:39 -0600349 if (!err && crypto_memneq(pctx->auth_tag, pctx->odata, authsize))
Joy Latten4a49b492007-12-12 20:25:13 +0800350 err = -EBADMSG;
351 }
352 aead_request_complete(req, err);
353}
354
355static int crypto_ccm_decrypt(struct aead_request *req)
356{
357 struct crypto_aead *aead = crypto_aead_reqtfm(req);
358 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
359 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
Herbert Xu464b93a2016-07-12 13:17:38 +0800360 struct skcipher_request *skreq = &pctx->skreq;
Joy Latten4a49b492007-12-12 20:25:13 +0800361 struct scatterlist *dst;
362 unsigned int authsize = crypto_aead_authsize(aead);
363 unsigned int cryptlen = req->cryptlen;
364 u8 *authtag = pctx->auth_tag;
365 u8 *odata = pctx->odata;
Romain Izard441f99c2017-10-31 15:42:35 +0100366 u8 *iv = pctx->idata;
Joy Latten4a49b492007-12-12 20:25:13 +0800367 int err;
368
Joy Latten4a49b492007-12-12 20:25:13 +0800369 cryptlen -= authsize;
370
Herbert Xu81c4c352015-07-14 16:53:18 +0800371 err = crypto_ccm_init_crypt(req, authtag);
Joy Latten4a49b492007-12-12 20:25:13 +0800372 if (err)
373 return err;
374
Herbert Xu81c4c352015-07-14 16:53:18 +0800375 scatterwalk_map_and_copy(authtag, sg_next(pctx->src), cryptlen,
376 authsize, 0);
Joy Latten4a49b492007-12-12 20:25:13 +0800377
378 dst = pctx->src;
Herbert Xu81c4c352015-07-14 16:53:18 +0800379 if (req->src != req->dst)
Joy Latten4a49b492007-12-12 20:25:13 +0800380 dst = pctx->dst;
Joy Latten4a49b492007-12-12 20:25:13 +0800381
Romain Izard441f99c2017-10-31 15:42:35 +0100382 memcpy(iv, req->iv, 16);
383
Herbert Xu464b93a2016-07-12 13:17:38 +0800384 skcipher_request_set_tfm(skreq, ctx->ctr);
385 skcipher_request_set_callback(skreq, pctx->flags,
386 crypto_ccm_decrypt_done, req);
387 skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv);
388 err = crypto_skcipher_decrypt(skreq);
Joy Latten4a49b492007-12-12 20:25:13 +0800389 if (err)
390 return err;
391
Herbert Xu81c4c352015-07-14 16:53:18 +0800392 err = crypto_ccm_auth(req, sg_next(dst), cryptlen);
Joy Latten4a49b492007-12-12 20:25:13 +0800393 if (err)
394 return err;
395
396 /* verify */
James Yonan6bf37e52013-09-26 02:20:39 -0600397 if (crypto_memneq(authtag, odata, authsize))
Joy Latten4a49b492007-12-12 20:25:13 +0800398 return -EBADMSG;
399
400 return err;
401}
402
Herbert Xu81c4c352015-07-14 16:53:18 +0800403static int crypto_ccm_init_tfm(struct crypto_aead *tfm)
Joy Latten4a49b492007-12-12 20:25:13 +0800404{
Herbert Xu81c4c352015-07-14 16:53:18 +0800405 struct aead_instance *inst = aead_alg_instance(tfm);
406 struct ccm_instance_ctx *ictx = aead_instance_ctx(inst);
407 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000408 struct crypto_ahash *mac;
Herbert Xu464b93a2016-07-12 13:17:38 +0800409 struct crypto_skcipher *ctr;
Joy Latten4a49b492007-12-12 20:25:13 +0800410 unsigned long align;
411 int err;
412
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000413 mac = crypto_spawn_ahash(&ictx->mac);
414 if (IS_ERR(mac))
415 return PTR_ERR(mac);
Joy Latten4a49b492007-12-12 20:25:13 +0800416
Eric Biggers60425a82016-10-28 09:52:19 -0700417 ctr = crypto_spawn_skcipher(&ictx->ctr);
Joy Latten4a49b492007-12-12 20:25:13 +0800418 err = PTR_ERR(ctr);
419 if (IS_ERR(ctr))
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000420 goto err_free_mac;
Joy Latten4a49b492007-12-12 20:25:13 +0800421
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000422 ctx->mac = mac;
Joy Latten4a49b492007-12-12 20:25:13 +0800423 ctx->ctr = ctr;
424
Herbert Xu81c4c352015-07-14 16:53:18 +0800425 align = crypto_aead_alignmask(tfm);
Joy Latten4a49b492007-12-12 20:25:13 +0800426 align &= ~(crypto_tfm_ctx_alignment() - 1);
Herbert Xu81c4c352015-07-14 16:53:18 +0800427 crypto_aead_set_reqsize(
428 tfm,
Herbert Xu2c221ad2015-05-11 17:47:56 +0800429 align + sizeof(struct crypto_ccm_req_priv_ctx) +
Herbert Xu464b93a2016-07-12 13:17:38 +0800430 crypto_skcipher_reqsize(ctr));
Joy Latten4a49b492007-12-12 20:25:13 +0800431
432 return 0;
433
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000434err_free_mac:
435 crypto_free_ahash(mac);
Joy Latten4a49b492007-12-12 20:25:13 +0800436 return err;
437}
438
Herbert Xu81c4c352015-07-14 16:53:18 +0800439static void crypto_ccm_exit_tfm(struct crypto_aead *tfm)
Joy Latten4a49b492007-12-12 20:25:13 +0800440{
Herbert Xu81c4c352015-07-14 16:53:18 +0800441 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm);
Joy Latten4a49b492007-12-12 20:25:13 +0800442
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000443 crypto_free_ahash(ctx->mac);
Herbert Xu464b93a2016-07-12 13:17:38 +0800444 crypto_free_skcipher(ctx->ctr);
Joy Latten4a49b492007-12-12 20:25:13 +0800445}
446
Herbert Xu81c4c352015-07-14 16:53:18 +0800447static void crypto_ccm_free(struct aead_instance *inst)
448{
449 struct ccm_instance_ctx *ctx = aead_instance_ctx(inst);
450
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000451 crypto_drop_ahash(&ctx->mac);
Herbert Xu81c4c352015-07-14 16:53:18 +0800452 crypto_drop_skcipher(&ctx->ctr);
453 kfree(inst);
454}
455
456static int crypto_ccm_create_common(struct crypto_template *tmpl,
457 struct rtattr **tb,
Herbert Xu81c4c352015-07-14 16:53:18 +0800458 const char *ctr_name,
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000459 const char *mac_name)
Joy Latten4a49b492007-12-12 20:25:13 +0800460{
461 struct crypto_attr_type *algt;
Herbert Xu81c4c352015-07-14 16:53:18 +0800462 struct aead_instance *inst;
Herbert Xu464b93a2016-07-12 13:17:38 +0800463 struct skcipher_alg *ctr;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000464 struct crypto_alg *mac_alg;
465 struct hash_alg_common *mac;
Joy Latten4a49b492007-12-12 20:25:13 +0800466 struct ccm_instance_ctx *ictx;
467 int err;
468
469 algt = crypto_get_attr_type(tb);
Joy Latten4a49b492007-12-12 20:25:13 +0800470 if (IS_ERR(algt))
Herbert Xu81c4c352015-07-14 16:53:18 +0800471 return PTR_ERR(algt);
Joy Latten4a49b492007-12-12 20:25:13 +0800472
Herbert Xu5e4b8c12015-08-13 17:29:06 +0800473 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
Herbert Xu81c4c352015-07-14 16:53:18 +0800474 return -EINVAL;
Joy Latten4a49b492007-12-12 20:25:13 +0800475
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000476 mac_alg = crypto_find_alg(mac_name, &crypto_ahash_type,
477 CRYPTO_ALG_TYPE_HASH,
478 CRYPTO_ALG_TYPE_AHASH_MASK |
479 CRYPTO_ALG_ASYNC);
480 if (IS_ERR(mac_alg))
481 return PTR_ERR(mac_alg);
Joy Latten4a49b492007-12-12 20:25:13 +0800482
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000483 mac = __crypto_hash_alg_common(mac_alg);
Joy Latten4a49b492007-12-12 20:25:13 +0800484 err = -EINVAL;
Eric Biggersa80da822019-04-18 14:44:27 -0700485 if (strncmp(mac->base.cra_name, "cbcmac(", 7) != 0 ||
486 mac->digestsize != 16)
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000487 goto out_put_mac;
Joy Latten4a49b492007-12-12 20:25:13 +0800488
489 inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
490 err = -ENOMEM;
491 if (!inst)
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000492 goto out_put_mac;
Joy Latten4a49b492007-12-12 20:25:13 +0800493
Herbert Xu81c4c352015-07-14 16:53:18 +0800494 ictx = aead_instance_ctx(inst);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000495 err = crypto_init_ahash_spawn(&ictx->mac, mac,
496 aead_crypto_instance(inst));
Joy Latten4a49b492007-12-12 20:25:13 +0800497 if (err)
498 goto err_free_inst;
499
Herbert Xu81c4c352015-07-14 16:53:18 +0800500 crypto_set_skcipher_spawn(&ictx->ctr, aead_crypto_instance(inst));
Eric Biggersa35528e2016-10-28 09:51:13 -0700501 err = crypto_grab_skcipher(&ictx->ctr, ctr_name, 0,
502 crypto_requires_sync(algt->type,
503 algt->mask));
Joy Latten4a49b492007-12-12 20:25:13 +0800504 if (err)
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000505 goto err_drop_mac;
Joy Latten4a49b492007-12-12 20:25:13 +0800506
Herbert Xu464b93a2016-07-12 13:17:38 +0800507 ctr = crypto_spawn_skcipher_alg(&ictx->ctr);
Joy Latten4a49b492007-12-12 20:25:13 +0800508
Eric Biggersa80da822019-04-18 14:44:27 -0700509 /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
Joy Latten4a49b492007-12-12 20:25:13 +0800510 err = -EINVAL;
Eric Biggersa80da822019-04-18 14:44:27 -0700511 if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
512 crypto_skcipher_alg_ivsize(ctr) != 16 ||
513 ctr->base.cra_blocksize != 1)
Joy Latten4a49b492007-12-12 20:25:13 +0800514 goto err_drop_ctr;
515
Eric Biggersa80da822019-04-18 14:44:27 -0700516 /* ctr and cbcmac must use the same underlying block cipher. */
517 if (strcmp(ctr->base.cra_name + 4, mac->base.cra_name + 7) != 0)
Joy Latten4a49b492007-12-12 20:25:13 +0800518 goto err_drop_ctr;
519
520 err = -ENAMETOOLONG;
Eric Biggersa80da822019-04-18 14:44:27 -0700521 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
522 "ccm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
523 goto err_drop_ctr;
524
Herbert Xu81c4c352015-07-14 16:53:18 +0800525 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
Herbert Xu464b93a2016-07-12 13:17:38 +0800526 "ccm_base(%s,%s)", ctr->base.cra_driver_name,
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000527 mac->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
Joy Latten4a49b492007-12-12 20:25:13 +0800528 goto err_drop_ctr;
529
Herbert Xu464b93a2016-07-12 13:17:38 +0800530 inst->alg.base.cra_flags = ctr->base.cra_flags & CRYPTO_ALG_ASYNC;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000531 inst->alg.base.cra_priority = (mac->base.cra_priority +
Herbert Xu464b93a2016-07-12 13:17:38 +0800532 ctr->base.cra_priority) / 2;
Herbert Xu81c4c352015-07-14 16:53:18 +0800533 inst->alg.base.cra_blocksize = 1;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000534 inst->alg.base.cra_alignmask = mac->base.cra_alignmask |
Ard Biesheuvel5ba8e2a2017-02-11 19:25:22 +0000535 ctr->base.cra_alignmask;
Herbert Xu81c4c352015-07-14 16:53:18 +0800536 inst->alg.ivsize = 16;
Herbert Xu464b93a2016-07-12 13:17:38 +0800537 inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
Herbert Xu81c4c352015-07-14 16:53:18 +0800538 inst->alg.maxauthsize = 16;
539 inst->alg.base.cra_ctxsize = sizeof(struct crypto_ccm_ctx);
540 inst->alg.init = crypto_ccm_init_tfm;
541 inst->alg.exit = crypto_ccm_exit_tfm;
542 inst->alg.setkey = crypto_ccm_setkey;
543 inst->alg.setauthsize = crypto_ccm_setauthsize;
544 inst->alg.encrypt = crypto_ccm_encrypt;
545 inst->alg.decrypt = crypto_ccm_decrypt;
Joy Latten4a49b492007-12-12 20:25:13 +0800546
Herbert Xu81c4c352015-07-14 16:53:18 +0800547 inst->free = crypto_ccm_free;
548
549 err = aead_register_instance(tmpl, inst);
550 if (err)
551 goto err_drop_ctr;
552
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000553out_put_mac:
554 crypto_mod_put(mac_alg);
Herbert Xu81c4c352015-07-14 16:53:18 +0800555 return err;
Joy Latten4a49b492007-12-12 20:25:13 +0800556
557err_drop_ctr:
558 crypto_drop_skcipher(&ictx->ctr);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000559err_drop_mac:
560 crypto_drop_ahash(&ictx->mac);
Joy Latten4a49b492007-12-12 20:25:13 +0800561err_free_inst:
562 kfree(inst);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000563 goto out_put_mac;
Joy Latten4a49b492007-12-12 20:25:13 +0800564}
565
Herbert Xu81c4c352015-07-14 16:53:18 +0800566static int crypto_ccm_create(struct crypto_template *tmpl, struct rtattr **tb)
Joy Latten4a49b492007-12-12 20:25:13 +0800567{
Joy Latten4a49b492007-12-12 20:25:13 +0800568 const char *cipher_name;
569 char ctr_name[CRYPTO_MAX_ALG_NAME];
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000570 char mac_name[CRYPTO_MAX_ALG_NAME];
Joy Latten4a49b492007-12-12 20:25:13 +0800571
572 cipher_name = crypto_attr_alg_name(tb[1]);
Joy Latten4a49b492007-12-12 20:25:13 +0800573 if (IS_ERR(cipher_name))
Herbert Xu81c4c352015-07-14 16:53:18 +0800574 return PTR_ERR(cipher_name);
Joy Latten4a49b492007-12-12 20:25:13 +0800575
576 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)",
577 cipher_name) >= CRYPTO_MAX_ALG_NAME)
Herbert Xu81c4c352015-07-14 16:53:18 +0800578 return -ENAMETOOLONG;
Joy Latten4a49b492007-12-12 20:25:13 +0800579
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000580 if (snprintf(mac_name, CRYPTO_MAX_ALG_NAME, "cbcmac(%s)",
581 cipher_name) >= CRYPTO_MAX_ALG_NAME)
582 return -ENAMETOOLONG;
583
Eric Biggersa80da822019-04-18 14:44:27 -0700584 return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name);
Joy Latten4a49b492007-12-12 20:25:13 +0800585}
586
587static struct crypto_template crypto_ccm_tmpl = {
588 .name = "ccm",
Herbert Xu81c4c352015-07-14 16:53:18 +0800589 .create = crypto_ccm_create,
Joy Latten4a49b492007-12-12 20:25:13 +0800590 .module = THIS_MODULE,
591};
592
Herbert Xu81c4c352015-07-14 16:53:18 +0800593static int crypto_ccm_base_create(struct crypto_template *tmpl,
594 struct rtattr **tb)
Joy Latten4a49b492007-12-12 20:25:13 +0800595{
Joy Latten4a49b492007-12-12 20:25:13 +0800596 const char *ctr_name;
Eric Biggersa80da822019-04-18 14:44:27 -0700597 const char *mac_name;
Joy Latten4a49b492007-12-12 20:25:13 +0800598
599 ctr_name = crypto_attr_alg_name(tb[1]);
Joy Latten4a49b492007-12-12 20:25:13 +0800600 if (IS_ERR(ctr_name))
Herbert Xu81c4c352015-07-14 16:53:18 +0800601 return PTR_ERR(ctr_name);
Joy Latten4a49b492007-12-12 20:25:13 +0800602
Eric Biggersa80da822019-04-18 14:44:27 -0700603 mac_name = crypto_attr_alg_name(tb[2]);
604 if (IS_ERR(mac_name))
605 return PTR_ERR(mac_name);
Joy Latten4a49b492007-12-12 20:25:13 +0800606
Eric Biggersa80da822019-04-18 14:44:27 -0700607 return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name);
Joy Latten4a49b492007-12-12 20:25:13 +0800608}
609
610static struct crypto_template crypto_ccm_base_tmpl = {
611 .name = "ccm_base",
Herbert Xu81c4c352015-07-14 16:53:18 +0800612 .create = crypto_ccm_base_create,
Joy Latten4a49b492007-12-12 20:25:13 +0800613 .module = THIS_MODULE,
614};
615
616static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key,
617 unsigned int keylen)
618{
619 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
620 struct crypto_aead *child = ctx->child;
621 int err;
622
623 if (keylen < 3)
624 return -EINVAL;
625
626 keylen -= 3;
627 memcpy(ctx->nonce, key + keylen, 3);
628
629 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
630 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
631 CRYPTO_TFM_REQ_MASK);
632 err = crypto_aead_setkey(child, key, keylen);
633 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
634 CRYPTO_TFM_RES_MASK);
635
636 return err;
637}
638
639static int crypto_rfc4309_setauthsize(struct crypto_aead *parent,
640 unsigned int authsize)
641{
642 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
643
644 switch (authsize) {
645 case 8:
646 case 12:
647 case 16:
648 break;
649 default:
650 return -EINVAL;
651 }
652
653 return crypto_aead_setauthsize(ctx->child, authsize);
654}
655
656static struct aead_request *crypto_rfc4309_crypt(struct aead_request *req)
657{
Herbert Xu81c4c352015-07-14 16:53:18 +0800658 struct crypto_rfc4309_req_ctx *rctx = aead_request_ctx(req);
659 struct aead_request *subreq = &rctx->subreq;
Joy Latten4a49b492007-12-12 20:25:13 +0800660 struct crypto_aead *aead = crypto_aead_reqtfm(req);
661 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead);
662 struct crypto_aead *child = ctx->child;
Herbert Xu81c4c352015-07-14 16:53:18 +0800663 struct scatterlist *sg;
Joy Latten4a49b492007-12-12 20:25:13 +0800664 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
665 crypto_aead_alignmask(child) + 1);
666
667 /* L' */
668 iv[0] = 3;
669
670 memcpy(iv + 1, ctx->nonce, 3);
671 memcpy(iv + 4, req->iv, 8);
672
Herbert Xu81c4c352015-07-14 16:53:18 +0800673 scatterwalk_map_and_copy(iv + 16, req->src, 0, req->assoclen - 8, 0);
674
675 sg_init_table(rctx->src, 3);
676 sg_set_buf(rctx->src, iv + 16, req->assoclen - 8);
677 sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
678 if (sg != rctx->src + 1)
679 sg_chain(rctx->src, 2, sg);
680
681 if (req->src != req->dst) {
682 sg_init_table(rctx->dst, 3);
683 sg_set_buf(rctx->dst, iv + 16, req->assoclen - 8);
684 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
685 if (sg != rctx->dst + 1)
686 sg_chain(rctx->dst, 2, sg);
687 }
688
Joy Latten4a49b492007-12-12 20:25:13 +0800689 aead_request_set_tfm(subreq, child);
690 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
691 req->base.data);
Herbert Xu81c4c352015-07-14 16:53:18 +0800692 aead_request_set_crypt(subreq, rctx->src,
693 req->src == req->dst ? rctx->src : rctx->dst,
694 req->cryptlen, iv);
695 aead_request_set_ad(subreq, req->assoclen - 8);
Joy Latten4a49b492007-12-12 20:25:13 +0800696
697 return subreq;
698}
699
700static int crypto_rfc4309_encrypt(struct aead_request *req)
701{
Herbert Xu81c4c352015-07-14 16:53:18 +0800702 if (req->assoclen != 16 && req->assoclen != 20)
703 return -EINVAL;
704
Joy Latten4a49b492007-12-12 20:25:13 +0800705 req = crypto_rfc4309_crypt(req);
706
707 return crypto_aead_encrypt(req);
708}
709
710static int crypto_rfc4309_decrypt(struct aead_request *req)
711{
Herbert Xu81c4c352015-07-14 16:53:18 +0800712 if (req->assoclen != 16 && req->assoclen != 20)
713 return -EINVAL;
714
Joy Latten4a49b492007-12-12 20:25:13 +0800715 req = crypto_rfc4309_crypt(req);
716
717 return crypto_aead_decrypt(req);
718}
719
Herbert Xu81c4c352015-07-14 16:53:18 +0800720static int crypto_rfc4309_init_tfm(struct crypto_aead *tfm)
Joy Latten4a49b492007-12-12 20:25:13 +0800721{
Herbert Xu81c4c352015-07-14 16:53:18 +0800722 struct aead_instance *inst = aead_alg_instance(tfm);
723 struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
724 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm);
Joy Latten4a49b492007-12-12 20:25:13 +0800725 struct crypto_aead *aead;
726 unsigned long align;
727
728 aead = crypto_spawn_aead(spawn);
729 if (IS_ERR(aead))
730 return PTR_ERR(aead);
731
732 ctx->child = aead;
733
734 align = crypto_aead_alignmask(aead);
735 align &= ~(crypto_tfm_ctx_alignment() - 1);
Herbert Xu81c4c352015-07-14 16:53:18 +0800736 crypto_aead_set_reqsize(
737 tfm,
738 sizeof(struct crypto_rfc4309_req_ctx) +
Herbert Xu2c221ad2015-05-11 17:47:56 +0800739 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
Herbert Xu81c4c352015-07-14 16:53:18 +0800740 align + 32);
Joy Latten4a49b492007-12-12 20:25:13 +0800741
742 return 0;
743}
744
Herbert Xu81c4c352015-07-14 16:53:18 +0800745static void crypto_rfc4309_exit_tfm(struct crypto_aead *tfm)
Joy Latten4a49b492007-12-12 20:25:13 +0800746{
Herbert Xu81c4c352015-07-14 16:53:18 +0800747 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm);
Joy Latten4a49b492007-12-12 20:25:13 +0800748
749 crypto_free_aead(ctx->child);
750}
751
Herbert Xu81c4c352015-07-14 16:53:18 +0800752static void crypto_rfc4309_free(struct aead_instance *inst)
753{
754 crypto_drop_aead(aead_instance_ctx(inst));
755 kfree(inst);
756}
757
758static int crypto_rfc4309_create(struct crypto_template *tmpl,
759 struct rtattr **tb)
Joy Latten4a49b492007-12-12 20:25:13 +0800760{
761 struct crypto_attr_type *algt;
Herbert Xu81c4c352015-07-14 16:53:18 +0800762 struct aead_instance *inst;
Joy Latten4a49b492007-12-12 20:25:13 +0800763 struct crypto_aead_spawn *spawn;
Herbert Xu81c4c352015-07-14 16:53:18 +0800764 struct aead_alg *alg;
Joy Latten4a49b492007-12-12 20:25:13 +0800765 const char *ccm_name;
766 int err;
767
768 algt = crypto_get_attr_type(tb);
Joy Latten4a49b492007-12-12 20:25:13 +0800769 if (IS_ERR(algt))
Herbert Xu81c4c352015-07-14 16:53:18 +0800770 return PTR_ERR(algt);
Joy Latten4a49b492007-12-12 20:25:13 +0800771
Herbert Xu5e4b8c12015-08-13 17:29:06 +0800772 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
Herbert Xu81c4c352015-07-14 16:53:18 +0800773 return -EINVAL;
Joy Latten4a49b492007-12-12 20:25:13 +0800774
775 ccm_name = crypto_attr_alg_name(tb[1]);
Joy Latten4a49b492007-12-12 20:25:13 +0800776 if (IS_ERR(ccm_name))
Herbert Xu81c4c352015-07-14 16:53:18 +0800777 return PTR_ERR(ccm_name);
Joy Latten4a49b492007-12-12 20:25:13 +0800778
779 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
780 if (!inst)
Herbert Xu81c4c352015-07-14 16:53:18 +0800781 return -ENOMEM;
Joy Latten4a49b492007-12-12 20:25:13 +0800782
Herbert Xu81c4c352015-07-14 16:53:18 +0800783 spawn = aead_instance_ctx(inst);
784 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
Joy Latten4a49b492007-12-12 20:25:13 +0800785 err = crypto_grab_aead(spawn, ccm_name, 0,
786 crypto_requires_sync(algt->type, algt->mask));
787 if (err)
788 goto out_free_inst;
789
Herbert Xu81c4c352015-07-14 16:53:18 +0800790 alg = crypto_spawn_aead_alg(spawn);
Joy Latten4a49b492007-12-12 20:25:13 +0800791
792 err = -EINVAL;
793
794 /* We only support 16-byte blocks. */
Herbert Xu81c4c352015-07-14 16:53:18 +0800795 if (crypto_aead_alg_ivsize(alg) != 16)
Joy Latten4a49b492007-12-12 20:25:13 +0800796 goto out_drop_alg;
797
798 /* Not a stream cipher? */
Herbert Xu81c4c352015-07-14 16:53:18 +0800799 if (alg->base.cra_blocksize != 1)
Joy Latten4a49b492007-12-12 20:25:13 +0800800 goto out_drop_alg;
801
802 err = -ENAMETOOLONG;
Herbert Xu81c4c352015-07-14 16:53:18 +0800803 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
804 "rfc4309(%s)", alg->base.cra_name) >=
805 CRYPTO_MAX_ALG_NAME ||
806 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
807 "rfc4309(%s)", alg->base.cra_driver_name) >=
Joy Latten4a49b492007-12-12 20:25:13 +0800808 CRYPTO_MAX_ALG_NAME)
809 goto out_drop_alg;
810
Herbert Xu81c4c352015-07-14 16:53:18 +0800811 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
Herbert Xu81c4c352015-07-14 16:53:18 +0800812 inst->alg.base.cra_priority = alg->base.cra_priority;
813 inst->alg.base.cra_blocksize = 1;
814 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
Joy Latten4a49b492007-12-12 20:25:13 +0800815
Herbert Xu81c4c352015-07-14 16:53:18 +0800816 inst->alg.ivsize = 8;
Herbert Xu464b93a2016-07-12 13:17:38 +0800817 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
Herbert Xu81c4c352015-07-14 16:53:18 +0800818 inst->alg.maxauthsize = 16;
Joy Latten4a49b492007-12-12 20:25:13 +0800819
Herbert Xu81c4c352015-07-14 16:53:18 +0800820 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx);
Joy Latten4a49b492007-12-12 20:25:13 +0800821
Herbert Xu81c4c352015-07-14 16:53:18 +0800822 inst->alg.init = crypto_rfc4309_init_tfm;
823 inst->alg.exit = crypto_rfc4309_exit_tfm;
Joy Latten4a49b492007-12-12 20:25:13 +0800824
Herbert Xu81c4c352015-07-14 16:53:18 +0800825 inst->alg.setkey = crypto_rfc4309_setkey;
826 inst->alg.setauthsize = crypto_rfc4309_setauthsize;
827 inst->alg.encrypt = crypto_rfc4309_encrypt;
828 inst->alg.decrypt = crypto_rfc4309_decrypt;
Joy Latten4a49b492007-12-12 20:25:13 +0800829
Herbert Xu81c4c352015-07-14 16:53:18 +0800830 inst->free = crypto_rfc4309_free;
831
832 err = aead_register_instance(tmpl, inst);
833 if (err)
834 goto out_drop_alg;
Joy Latten4a49b492007-12-12 20:25:13 +0800835
836out:
Herbert Xu81c4c352015-07-14 16:53:18 +0800837 return err;
Joy Latten4a49b492007-12-12 20:25:13 +0800838
839out_drop_alg:
840 crypto_drop_aead(spawn);
841out_free_inst:
842 kfree(inst);
Joy Latten4a49b492007-12-12 20:25:13 +0800843 goto out;
844}
845
Joy Latten4a49b492007-12-12 20:25:13 +0800846static struct crypto_template crypto_rfc4309_tmpl = {
847 .name = "rfc4309",
Herbert Xu81c4c352015-07-14 16:53:18 +0800848 .create = crypto_rfc4309_create,
Joy Latten4a49b492007-12-12 20:25:13 +0800849 .module = THIS_MODULE,
850};
851
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000852static int crypto_cbcmac_digest_setkey(struct crypto_shash *parent,
853 const u8 *inkey, unsigned int keylen)
854{
855 struct cbcmac_tfm_ctx *ctx = crypto_shash_ctx(parent);
856
857 return crypto_cipher_setkey(ctx->child, inkey, keylen);
858}
859
860static int crypto_cbcmac_digest_init(struct shash_desc *pdesc)
861{
862 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
863 int bs = crypto_shash_digestsize(pdesc->tfm);
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000864 u8 *dg = (u8 *)ctx + crypto_shash_descsize(pdesc->tfm) - bs;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000865
866 ctx->len = 0;
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000867 memset(dg, 0, bs);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000868
869 return 0;
870}
871
872static int crypto_cbcmac_digest_update(struct shash_desc *pdesc, const u8 *p,
873 unsigned int len)
874{
875 struct crypto_shash *parent = pdesc->tfm;
876 struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent);
877 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
878 struct crypto_cipher *tfm = tctx->child;
879 int bs = crypto_shash_digestsize(parent);
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000880 u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000881
882 while (len > 0) {
883 unsigned int l = min(len, bs - ctx->len);
884
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000885 crypto_xor(dg + ctx->len, p, l);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000886 ctx->len +=l;
887 len -= l;
888 p += l;
889
890 if (ctx->len == bs) {
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000891 crypto_cipher_encrypt_one(tfm, dg, dg);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000892 ctx->len = 0;
893 }
894 }
895
896 return 0;
897}
898
899static int crypto_cbcmac_digest_final(struct shash_desc *pdesc, u8 *out)
900{
901 struct crypto_shash *parent = pdesc->tfm;
902 struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent);
903 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
904 struct crypto_cipher *tfm = tctx->child;
905 int bs = crypto_shash_digestsize(parent);
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000906 u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000907
908 if (ctx->len)
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000909 crypto_cipher_encrypt_one(tfm, dg, dg);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000910
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000911 memcpy(out, dg, bs);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000912 return 0;
913}
914
915static int cbcmac_init_tfm(struct crypto_tfm *tfm)
916{
917 struct crypto_cipher *cipher;
918 struct crypto_instance *inst = (void *)tfm->__crt_alg;
919 struct crypto_spawn *spawn = crypto_instance_ctx(inst);
920 struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
921
922 cipher = crypto_spawn_cipher(spawn);
923 if (IS_ERR(cipher))
924 return PTR_ERR(cipher);
925
926 ctx->child = cipher;
927
928 return 0;
929};
930
931static void cbcmac_exit_tfm(struct crypto_tfm *tfm)
932{
933 struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
934 crypto_free_cipher(ctx->child);
935}
936
937static int cbcmac_create(struct crypto_template *tmpl, struct rtattr **tb)
938{
939 struct shash_instance *inst;
940 struct crypto_alg *alg;
941 int err;
942
943 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
944 if (err)
945 return err;
946
947 alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
948 CRYPTO_ALG_TYPE_MASK);
949 if (IS_ERR(alg))
950 return PTR_ERR(alg);
951
952 inst = shash_alloc_instance("cbcmac", alg);
953 err = PTR_ERR(inst);
954 if (IS_ERR(inst))
955 goto out_put_alg;
956
957 err = crypto_init_spawn(shash_instance_ctx(inst), alg,
958 shash_crypto_instance(inst),
959 CRYPTO_ALG_TYPE_MASK);
960 if (err)
961 goto out_free_inst;
962
963 inst->alg.base.cra_priority = alg->cra_priority;
964 inst->alg.base.cra_blocksize = 1;
965
966 inst->alg.digestsize = alg->cra_blocksize;
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000967 inst->alg.descsize = ALIGN(sizeof(struct cbcmac_desc_ctx),
968 alg->cra_alignmask + 1) +
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000969 alg->cra_blocksize;
970
971 inst->alg.base.cra_ctxsize = sizeof(struct cbcmac_tfm_ctx);
972 inst->alg.base.cra_init = cbcmac_init_tfm;
973 inst->alg.base.cra_exit = cbcmac_exit_tfm;
974
975 inst->alg.init = crypto_cbcmac_digest_init;
976 inst->alg.update = crypto_cbcmac_digest_update;
977 inst->alg.final = crypto_cbcmac_digest_final;
978 inst->alg.setkey = crypto_cbcmac_digest_setkey;
979
980 err = shash_register_instance(tmpl, inst);
981
982out_free_inst:
983 if (err)
984 shash_free_instance(shash_crypto_instance(inst));
985
986out_put_alg:
987 crypto_mod_put(alg);
988 return err;
989}
990
991static struct crypto_template crypto_cbcmac_tmpl = {
992 .name = "cbcmac",
993 .create = cbcmac_create,
994 .free = shash_free_instance,
995 .module = THIS_MODULE,
996};
997
Joy Latten4a49b492007-12-12 20:25:13 +0800998static int __init crypto_ccm_module_init(void)
999{
1000 int err;
1001
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +00001002 err = crypto_register_template(&crypto_cbcmac_tmpl);
Joy Latten4a49b492007-12-12 20:25:13 +08001003 if (err)
1004 goto out;
1005
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +00001006 err = crypto_register_template(&crypto_ccm_base_tmpl);
1007 if (err)
1008 goto out_undo_cbcmac;
1009
Joy Latten4a49b492007-12-12 20:25:13 +08001010 err = crypto_register_template(&crypto_ccm_tmpl);
1011 if (err)
1012 goto out_undo_base;
1013
1014 err = crypto_register_template(&crypto_rfc4309_tmpl);
1015 if (err)
1016 goto out_undo_ccm;
1017
1018out:
1019 return err;
1020
1021out_undo_ccm:
1022 crypto_unregister_template(&crypto_ccm_tmpl);
1023out_undo_base:
1024 crypto_unregister_template(&crypto_ccm_base_tmpl);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +00001025out_undo_cbcmac:
1026 crypto_register_template(&crypto_cbcmac_tmpl);
Joy Latten4a49b492007-12-12 20:25:13 +08001027 goto out;
1028}
1029
1030static void __exit crypto_ccm_module_exit(void)
1031{
1032 crypto_unregister_template(&crypto_rfc4309_tmpl);
1033 crypto_unregister_template(&crypto_ccm_tmpl);
1034 crypto_unregister_template(&crypto_ccm_base_tmpl);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +00001035 crypto_unregister_template(&crypto_cbcmac_tmpl);
Joy Latten4a49b492007-12-12 20:25:13 +08001036}
1037
1038module_init(crypto_ccm_module_init);
1039module_exit(crypto_ccm_module_exit);
1040
1041MODULE_LICENSE("GPL");
1042MODULE_DESCRIPTION("Counter with CBC MAC");
Kees Cook5d26a102014-11-20 17:05:53 -08001043MODULE_ALIAS_CRYPTO("ccm_base");
1044MODULE_ALIAS_CRYPTO("rfc4309");
Kees Cook4943ba12014-11-24 16:32:38 -08001045MODULE_ALIAS_CRYPTO("ccm");