blob: 1ce37ae0ce565a130962f50244f331117fe965d8 [file] [log] [blame]
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;
366 u8 *iv = req->iv;
367 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
Herbert Xu464b93a2016-07-12 13:17:38 +0800382 skcipher_request_set_tfm(skreq, ctx->ctr);
383 skcipher_request_set_callback(skreq, pctx->flags,
384 crypto_ccm_decrypt_done, req);
385 skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv);
386 err = crypto_skcipher_decrypt(skreq);
Joy Latten4a49b492007-12-12 20:25:13 +0800387 if (err)
388 return err;
389
Herbert Xu81c4c352015-07-14 16:53:18 +0800390 err = crypto_ccm_auth(req, sg_next(dst), cryptlen);
Joy Latten4a49b492007-12-12 20:25:13 +0800391 if (err)
392 return err;
393
394 /* verify */
James Yonan6bf37e52013-09-26 02:20:39 -0600395 if (crypto_memneq(authtag, odata, authsize))
Joy Latten4a49b492007-12-12 20:25:13 +0800396 return -EBADMSG;
397
398 return err;
399}
400
Herbert Xu81c4c352015-07-14 16:53:18 +0800401static int crypto_ccm_init_tfm(struct crypto_aead *tfm)
Joy Latten4a49b492007-12-12 20:25:13 +0800402{
Herbert Xu81c4c352015-07-14 16:53:18 +0800403 struct aead_instance *inst = aead_alg_instance(tfm);
404 struct ccm_instance_ctx *ictx = aead_instance_ctx(inst);
405 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000406 struct crypto_ahash *mac;
Herbert Xu464b93a2016-07-12 13:17:38 +0800407 struct crypto_skcipher *ctr;
Joy Latten4a49b492007-12-12 20:25:13 +0800408 unsigned long align;
409 int err;
410
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000411 mac = crypto_spawn_ahash(&ictx->mac);
412 if (IS_ERR(mac))
413 return PTR_ERR(mac);
Joy Latten4a49b492007-12-12 20:25:13 +0800414
Eric Biggers60425a82016-10-28 09:52:19 -0700415 ctr = crypto_spawn_skcipher(&ictx->ctr);
Joy Latten4a49b492007-12-12 20:25:13 +0800416 err = PTR_ERR(ctr);
417 if (IS_ERR(ctr))
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000418 goto err_free_mac;
Joy Latten4a49b492007-12-12 20:25:13 +0800419
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000420 ctx->mac = mac;
Joy Latten4a49b492007-12-12 20:25:13 +0800421 ctx->ctr = ctr;
422
Herbert Xu81c4c352015-07-14 16:53:18 +0800423 align = crypto_aead_alignmask(tfm);
Joy Latten4a49b492007-12-12 20:25:13 +0800424 align &= ~(crypto_tfm_ctx_alignment() - 1);
Herbert Xu81c4c352015-07-14 16:53:18 +0800425 crypto_aead_set_reqsize(
426 tfm,
Herbert Xu2c221ad2015-05-11 17:47:56 +0800427 align + sizeof(struct crypto_ccm_req_priv_ctx) +
Herbert Xu464b93a2016-07-12 13:17:38 +0800428 crypto_skcipher_reqsize(ctr));
Joy Latten4a49b492007-12-12 20:25:13 +0800429
430 return 0;
431
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000432err_free_mac:
433 crypto_free_ahash(mac);
Joy Latten4a49b492007-12-12 20:25:13 +0800434 return err;
435}
436
Herbert Xu81c4c352015-07-14 16:53:18 +0800437static void crypto_ccm_exit_tfm(struct crypto_aead *tfm)
Joy Latten4a49b492007-12-12 20:25:13 +0800438{
Herbert Xu81c4c352015-07-14 16:53:18 +0800439 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm);
Joy Latten4a49b492007-12-12 20:25:13 +0800440
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000441 crypto_free_ahash(ctx->mac);
Herbert Xu464b93a2016-07-12 13:17:38 +0800442 crypto_free_skcipher(ctx->ctr);
Joy Latten4a49b492007-12-12 20:25:13 +0800443}
444
Herbert Xu81c4c352015-07-14 16:53:18 +0800445static void crypto_ccm_free(struct aead_instance *inst)
446{
447 struct ccm_instance_ctx *ctx = aead_instance_ctx(inst);
448
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000449 crypto_drop_ahash(&ctx->mac);
Herbert Xu81c4c352015-07-14 16:53:18 +0800450 crypto_drop_skcipher(&ctx->ctr);
451 kfree(inst);
452}
453
454static int crypto_ccm_create_common(struct crypto_template *tmpl,
455 struct rtattr **tb,
456 const char *full_name,
457 const char *ctr_name,
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000458 const char *mac_name)
Joy Latten4a49b492007-12-12 20:25:13 +0800459{
460 struct crypto_attr_type *algt;
Herbert Xu81c4c352015-07-14 16:53:18 +0800461 struct aead_instance *inst;
Herbert Xu464b93a2016-07-12 13:17:38 +0800462 struct skcipher_alg *ctr;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000463 struct crypto_alg *mac_alg;
464 struct hash_alg_common *mac;
Joy Latten4a49b492007-12-12 20:25:13 +0800465 struct ccm_instance_ctx *ictx;
466 int err;
467
468 algt = crypto_get_attr_type(tb);
Joy Latten4a49b492007-12-12 20:25:13 +0800469 if (IS_ERR(algt))
Herbert Xu81c4c352015-07-14 16:53:18 +0800470 return PTR_ERR(algt);
Joy Latten4a49b492007-12-12 20:25:13 +0800471
Herbert Xu5e4b8c12015-08-13 17:29:06 +0800472 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
Herbert Xu81c4c352015-07-14 16:53:18 +0800473 return -EINVAL;
Joy Latten4a49b492007-12-12 20:25:13 +0800474
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000475 mac_alg = crypto_find_alg(mac_name, &crypto_ahash_type,
476 CRYPTO_ALG_TYPE_HASH,
477 CRYPTO_ALG_TYPE_AHASH_MASK |
478 CRYPTO_ALG_ASYNC);
479 if (IS_ERR(mac_alg))
480 return PTR_ERR(mac_alg);
Joy Latten4a49b492007-12-12 20:25:13 +0800481
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000482 mac = __crypto_hash_alg_common(mac_alg);
Joy Latten4a49b492007-12-12 20:25:13 +0800483 err = -EINVAL;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000484 if (mac->digestsize != 16)
485 goto out_put_mac;
Joy Latten4a49b492007-12-12 20:25:13 +0800486
487 inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
488 err = -ENOMEM;
489 if (!inst)
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000490 goto out_put_mac;
Joy Latten4a49b492007-12-12 20:25:13 +0800491
Herbert Xu81c4c352015-07-14 16:53:18 +0800492 ictx = aead_instance_ctx(inst);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000493 err = crypto_init_ahash_spawn(&ictx->mac, mac,
494 aead_crypto_instance(inst));
Joy Latten4a49b492007-12-12 20:25:13 +0800495 if (err)
496 goto err_free_inst;
497
Herbert Xu81c4c352015-07-14 16:53:18 +0800498 crypto_set_skcipher_spawn(&ictx->ctr, aead_crypto_instance(inst));
Eric Biggersa35528e2016-10-28 09:51:13 -0700499 err = crypto_grab_skcipher(&ictx->ctr, ctr_name, 0,
500 crypto_requires_sync(algt->type,
501 algt->mask));
Joy Latten4a49b492007-12-12 20:25:13 +0800502 if (err)
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000503 goto err_drop_mac;
Joy Latten4a49b492007-12-12 20:25:13 +0800504
Herbert Xu464b93a2016-07-12 13:17:38 +0800505 ctr = crypto_spawn_skcipher_alg(&ictx->ctr);
Joy Latten4a49b492007-12-12 20:25:13 +0800506
507 /* Not a stream cipher? */
508 err = -EINVAL;
Herbert Xu464b93a2016-07-12 13:17:38 +0800509 if (ctr->base.cra_blocksize != 1)
Joy Latten4a49b492007-12-12 20:25:13 +0800510 goto err_drop_ctr;
511
512 /* We want the real thing! */
Herbert Xu464b93a2016-07-12 13:17:38 +0800513 if (crypto_skcipher_alg_ivsize(ctr) != 16)
Joy Latten4a49b492007-12-12 20:25:13 +0800514 goto err_drop_ctr;
515
516 err = -ENAMETOOLONG;
Herbert Xu81c4c352015-07-14 16:53:18 +0800517 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
Herbert Xu464b93a2016-07-12 13:17:38 +0800518 "ccm_base(%s,%s)", ctr->base.cra_driver_name,
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000519 mac->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
Joy Latten4a49b492007-12-12 20:25:13 +0800520 goto err_drop_ctr;
521
Herbert Xu81c4c352015-07-14 16:53:18 +0800522 memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
Joy Latten4a49b492007-12-12 20:25:13 +0800523
Herbert Xu464b93a2016-07-12 13:17:38 +0800524 inst->alg.base.cra_flags = ctr->base.cra_flags & CRYPTO_ALG_ASYNC;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000525 inst->alg.base.cra_priority = (mac->base.cra_priority +
Herbert Xu464b93a2016-07-12 13:17:38 +0800526 ctr->base.cra_priority) / 2;
Herbert Xu81c4c352015-07-14 16:53:18 +0800527 inst->alg.base.cra_blocksize = 1;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000528 inst->alg.base.cra_alignmask = mac->base.cra_alignmask |
Ard Biesheuvel5ba8e2a2017-02-11 19:25:22 +0000529 ctr->base.cra_alignmask;
Herbert Xu81c4c352015-07-14 16:53:18 +0800530 inst->alg.ivsize = 16;
Herbert Xu464b93a2016-07-12 13:17:38 +0800531 inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
Herbert Xu81c4c352015-07-14 16:53:18 +0800532 inst->alg.maxauthsize = 16;
533 inst->alg.base.cra_ctxsize = sizeof(struct crypto_ccm_ctx);
534 inst->alg.init = crypto_ccm_init_tfm;
535 inst->alg.exit = crypto_ccm_exit_tfm;
536 inst->alg.setkey = crypto_ccm_setkey;
537 inst->alg.setauthsize = crypto_ccm_setauthsize;
538 inst->alg.encrypt = crypto_ccm_encrypt;
539 inst->alg.decrypt = crypto_ccm_decrypt;
Joy Latten4a49b492007-12-12 20:25:13 +0800540
Herbert Xu81c4c352015-07-14 16:53:18 +0800541 inst->free = crypto_ccm_free;
542
543 err = aead_register_instance(tmpl, inst);
544 if (err)
545 goto err_drop_ctr;
546
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000547out_put_mac:
548 crypto_mod_put(mac_alg);
Herbert Xu81c4c352015-07-14 16:53:18 +0800549 return err;
Joy Latten4a49b492007-12-12 20:25:13 +0800550
551err_drop_ctr:
552 crypto_drop_skcipher(&ictx->ctr);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000553err_drop_mac:
554 crypto_drop_ahash(&ictx->mac);
Joy Latten4a49b492007-12-12 20:25:13 +0800555err_free_inst:
556 kfree(inst);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000557 goto out_put_mac;
Joy Latten4a49b492007-12-12 20:25:13 +0800558}
559
Herbert Xu81c4c352015-07-14 16:53:18 +0800560static int crypto_ccm_create(struct crypto_template *tmpl, struct rtattr **tb)
Joy Latten4a49b492007-12-12 20:25:13 +0800561{
Joy Latten4a49b492007-12-12 20:25:13 +0800562 const char *cipher_name;
563 char ctr_name[CRYPTO_MAX_ALG_NAME];
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000564 char mac_name[CRYPTO_MAX_ALG_NAME];
Joy Latten4a49b492007-12-12 20:25:13 +0800565 char full_name[CRYPTO_MAX_ALG_NAME];
566
567 cipher_name = crypto_attr_alg_name(tb[1]);
Joy Latten4a49b492007-12-12 20:25:13 +0800568 if (IS_ERR(cipher_name))
Herbert Xu81c4c352015-07-14 16:53:18 +0800569 return PTR_ERR(cipher_name);
Joy Latten4a49b492007-12-12 20:25:13 +0800570
571 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)",
572 cipher_name) >= CRYPTO_MAX_ALG_NAME)
Herbert Xu81c4c352015-07-14 16:53:18 +0800573 return -ENAMETOOLONG;
Joy Latten4a49b492007-12-12 20:25:13 +0800574
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000575 if (snprintf(mac_name, CRYPTO_MAX_ALG_NAME, "cbcmac(%s)",
576 cipher_name) >= CRYPTO_MAX_ALG_NAME)
577 return -ENAMETOOLONG;
578
Joy Latten4a49b492007-12-12 20:25:13 +0800579 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm(%s)", cipher_name) >=
580 CRYPTO_MAX_ALG_NAME)
Herbert Xu81c4c352015-07-14 16:53:18 +0800581 return -ENAMETOOLONG;
Joy Latten4a49b492007-12-12 20:25:13 +0800582
Herbert Xu81c4c352015-07-14 16:53:18 +0800583 return crypto_ccm_create_common(tmpl, tb, full_name, ctr_name,
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000584 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;
597 const char *cipher_name;
598 char full_name[CRYPTO_MAX_ALG_NAME];
599
600 ctr_name = crypto_attr_alg_name(tb[1]);
Joy Latten4a49b492007-12-12 20:25:13 +0800601 if (IS_ERR(ctr_name))
Herbert Xu81c4c352015-07-14 16:53:18 +0800602 return PTR_ERR(ctr_name);
Joy Latten4a49b492007-12-12 20:25:13 +0800603
604 cipher_name = crypto_attr_alg_name(tb[2]);
Joy Latten4a49b492007-12-12 20:25:13 +0800605 if (IS_ERR(cipher_name))
Herbert Xu81c4c352015-07-14 16:53:18 +0800606 return PTR_ERR(cipher_name);
Joy Latten4a49b492007-12-12 20:25:13 +0800607
608 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm_base(%s,%s)",
609 ctr_name, cipher_name) >= CRYPTO_MAX_ALG_NAME)
Herbert Xu81c4c352015-07-14 16:53:18 +0800610 return -ENAMETOOLONG;
Joy Latten4a49b492007-12-12 20:25:13 +0800611
Herbert Xu81c4c352015-07-14 16:53:18 +0800612 return crypto_ccm_create_common(tmpl, tb, full_name, ctr_name,
613 cipher_name);
Joy Latten4a49b492007-12-12 20:25:13 +0800614}
615
616static struct crypto_template crypto_ccm_base_tmpl = {
617 .name = "ccm_base",
Herbert Xu81c4c352015-07-14 16:53:18 +0800618 .create = crypto_ccm_base_create,
Joy Latten4a49b492007-12-12 20:25:13 +0800619 .module = THIS_MODULE,
620};
621
622static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key,
623 unsigned int keylen)
624{
625 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
626 struct crypto_aead *child = ctx->child;
627 int err;
628
629 if (keylen < 3)
630 return -EINVAL;
631
632 keylen -= 3;
633 memcpy(ctx->nonce, key + keylen, 3);
634
635 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
636 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
637 CRYPTO_TFM_REQ_MASK);
638 err = crypto_aead_setkey(child, key, keylen);
639 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
640 CRYPTO_TFM_RES_MASK);
641
642 return err;
643}
644
645static int crypto_rfc4309_setauthsize(struct crypto_aead *parent,
646 unsigned int authsize)
647{
648 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
649
650 switch (authsize) {
651 case 8:
652 case 12:
653 case 16:
654 break;
655 default:
656 return -EINVAL;
657 }
658
659 return crypto_aead_setauthsize(ctx->child, authsize);
660}
661
662static struct aead_request *crypto_rfc4309_crypt(struct aead_request *req)
663{
Herbert Xu81c4c352015-07-14 16:53:18 +0800664 struct crypto_rfc4309_req_ctx *rctx = aead_request_ctx(req);
665 struct aead_request *subreq = &rctx->subreq;
Joy Latten4a49b492007-12-12 20:25:13 +0800666 struct crypto_aead *aead = crypto_aead_reqtfm(req);
667 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead);
668 struct crypto_aead *child = ctx->child;
Herbert Xu81c4c352015-07-14 16:53:18 +0800669 struct scatterlist *sg;
Joy Latten4a49b492007-12-12 20:25:13 +0800670 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
671 crypto_aead_alignmask(child) + 1);
672
673 /* L' */
674 iv[0] = 3;
675
676 memcpy(iv + 1, ctx->nonce, 3);
677 memcpy(iv + 4, req->iv, 8);
678
Herbert Xu81c4c352015-07-14 16:53:18 +0800679 scatterwalk_map_and_copy(iv + 16, req->src, 0, req->assoclen - 8, 0);
680
681 sg_init_table(rctx->src, 3);
682 sg_set_buf(rctx->src, iv + 16, req->assoclen - 8);
683 sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
684 if (sg != rctx->src + 1)
685 sg_chain(rctx->src, 2, sg);
686
687 if (req->src != req->dst) {
688 sg_init_table(rctx->dst, 3);
689 sg_set_buf(rctx->dst, iv + 16, req->assoclen - 8);
690 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
691 if (sg != rctx->dst + 1)
692 sg_chain(rctx->dst, 2, sg);
693 }
694
Joy Latten4a49b492007-12-12 20:25:13 +0800695 aead_request_set_tfm(subreq, child);
696 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
697 req->base.data);
Herbert Xu81c4c352015-07-14 16:53:18 +0800698 aead_request_set_crypt(subreq, rctx->src,
699 req->src == req->dst ? rctx->src : rctx->dst,
700 req->cryptlen, iv);
701 aead_request_set_ad(subreq, req->assoclen - 8);
Joy Latten4a49b492007-12-12 20:25:13 +0800702
703 return subreq;
704}
705
706static int crypto_rfc4309_encrypt(struct aead_request *req)
707{
Herbert Xu81c4c352015-07-14 16:53:18 +0800708 if (req->assoclen != 16 && req->assoclen != 20)
709 return -EINVAL;
710
Joy Latten4a49b492007-12-12 20:25:13 +0800711 req = crypto_rfc4309_crypt(req);
712
713 return crypto_aead_encrypt(req);
714}
715
716static int crypto_rfc4309_decrypt(struct aead_request *req)
717{
Herbert Xu81c4c352015-07-14 16:53:18 +0800718 if (req->assoclen != 16 && req->assoclen != 20)
719 return -EINVAL;
720
Joy Latten4a49b492007-12-12 20:25:13 +0800721 req = crypto_rfc4309_crypt(req);
722
723 return crypto_aead_decrypt(req);
724}
725
Herbert Xu81c4c352015-07-14 16:53:18 +0800726static int crypto_rfc4309_init_tfm(struct crypto_aead *tfm)
Joy Latten4a49b492007-12-12 20:25:13 +0800727{
Herbert Xu81c4c352015-07-14 16:53:18 +0800728 struct aead_instance *inst = aead_alg_instance(tfm);
729 struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
730 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm);
Joy Latten4a49b492007-12-12 20:25:13 +0800731 struct crypto_aead *aead;
732 unsigned long align;
733
734 aead = crypto_spawn_aead(spawn);
735 if (IS_ERR(aead))
736 return PTR_ERR(aead);
737
738 ctx->child = aead;
739
740 align = crypto_aead_alignmask(aead);
741 align &= ~(crypto_tfm_ctx_alignment() - 1);
Herbert Xu81c4c352015-07-14 16:53:18 +0800742 crypto_aead_set_reqsize(
743 tfm,
744 sizeof(struct crypto_rfc4309_req_ctx) +
Herbert Xu2c221ad2015-05-11 17:47:56 +0800745 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
Herbert Xu81c4c352015-07-14 16:53:18 +0800746 align + 32);
Joy Latten4a49b492007-12-12 20:25:13 +0800747
748 return 0;
749}
750
Herbert Xu81c4c352015-07-14 16:53:18 +0800751static void crypto_rfc4309_exit_tfm(struct crypto_aead *tfm)
Joy Latten4a49b492007-12-12 20:25:13 +0800752{
Herbert Xu81c4c352015-07-14 16:53:18 +0800753 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm);
Joy Latten4a49b492007-12-12 20:25:13 +0800754
755 crypto_free_aead(ctx->child);
756}
757
Herbert Xu81c4c352015-07-14 16:53:18 +0800758static void crypto_rfc4309_free(struct aead_instance *inst)
759{
760 crypto_drop_aead(aead_instance_ctx(inst));
761 kfree(inst);
762}
763
764static int crypto_rfc4309_create(struct crypto_template *tmpl,
765 struct rtattr **tb)
Joy Latten4a49b492007-12-12 20:25:13 +0800766{
767 struct crypto_attr_type *algt;
Herbert Xu81c4c352015-07-14 16:53:18 +0800768 struct aead_instance *inst;
Joy Latten4a49b492007-12-12 20:25:13 +0800769 struct crypto_aead_spawn *spawn;
Herbert Xu81c4c352015-07-14 16:53:18 +0800770 struct aead_alg *alg;
Joy Latten4a49b492007-12-12 20:25:13 +0800771 const char *ccm_name;
772 int err;
773
774 algt = crypto_get_attr_type(tb);
Joy Latten4a49b492007-12-12 20:25:13 +0800775 if (IS_ERR(algt))
Herbert Xu81c4c352015-07-14 16:53:18 +0800776 return PTR_ERR(algt);
Joy Latten4a49b492007-12-12 20:25:13 +0800777
Herbert Xu5e4b8c12015-08-13 17:29:06 +0800778 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
Herbert Xu81c4c352015-07-14 16:53:18 +0800779 return -EINVAL;
Joy Latten4a49b492007-12-12 20:25:13 +0800780
781 ccm_name = crypto_attr_alg_name(tb[1]);
Joy Latten4a49b492007-12-12 20:25:13 +0800782 if (IS_ERR(ccm_name))
Herbert Xu81c4c352015-07-14 16:53:18 +0800783 return PTR_ERR(ccm_name);
Joy Latten4a49b492007-12-12 20:25:13 +0800784
785 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
786 if (!inst)
Herbert Xu81c4c352015-07-14 16:53:18 +0800787 return -ENOMEM;
Joy Latten4a49b492007-12-12 20:25:13 +0800788
Herbert Xu81c4c352015-07-14 16:53:18 +0800789 spawn = aead_instance_ctx(inst);
790 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
Joy Latten4a49b492007-12-12 20:25:13 +0800791 err = crypto_grab_aead(spawn, ccm_name, 0,
792 crypto_requires_sync(algt->type, algt->mask));
793 if (err)
794 goto out_free_inst;
795
Herbert Xu81c4c352015-07-14 16:53:18 +0800796 alg = crypto_spawn_aead_alg(spawn);
Joy Latten4a49b492007-12-12 20:25:13 +0800797
798 err = -EINVAL;
799
800 /* We only support 16-byte blocks. */
Herbert Xu81c4c352015-07-14 16:53:18 +0800801 if (crypto_aead_alg_ivsize(alg) != 16)
Joy Latten4a49b492007-12-12 20:25:13 +0800802 goto out_drop_alg;
803
804 /* Not a stream cipher? */
Herbert Xu81c4c352015-07-14 16:53:18 +0800805 if (alg->base.cra_blocksize != 1)
Joy Latten4a49b492007-12-12 20:25:13 +0800806 goto out_drop_alg;
807
808 err = -ENAMETOOLONG;
Herbert Xu81c4c352015-07-14 16:53:18 +0800809 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
810 "rfc4309(%s)", alg->base.cra_name) >=
811 CRYPTO_MAX_ALG_NAME ||
812 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
813 "rfc4309(%s)", alg->base.cra_driver_name) >=
Joy Latten4a49b492007-12-12 20:25:13 +0800814 CRYPTO_MAX_ALG_NAME)
815 goto out_drop_alg;
816
Herbert Xu81c4c352015-07-14 16:53:18 +0800817 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
Herbert Xu81c4c352015-07-14 16:53:18 +0800818 inst->alg.base.cra_priority = alg->base.cra_priority;
819 inst->alg.base.cra_blocksize = 1;
820 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
Joy Latten4a49b492007-12-12 20:25:13 +0800821
Herbert Xu81c4c352015-07-14 16:53:18 +0800822 inst->alg.ivsize = 8;
Herbert Xu464b93a2016-07-12 13:17:38 +0800823 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
Herbert Xu81c4c352015-07-14 16:53:18 +0800824 inst->alg.maxauthsize = 16;
Joy Latten4a49b492007-12-12 20:25:13 +0800825
Herbert Xu81c4c352015-07-14 16:53:18 +0800826 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx);
Joy Latten4a49b492007-12-12 20:25:13 +0800827
Herbert Xu81c4c352015-07-14 16:53:18 +0800828 inst->alg.init = crypto_rfc4309_init_tfm;
829 inst->alg.exit = crypto_rfc4309_exit_tfm;
Joy Latten4a49b492007-12-12 20:25:13 +0800830
Herbert Xu81c4c352015-07-14 16:53:18 +0800831 inst->alg.setkey = crypto_rfc4309_setkey;
832 inst->alg.setauthsize = crypto_rfc4309_setauthsize;
833 inst->alg.encrypt = crypto_rfc4309_encrypt;
834 inst->alg.decrypt = crypto_rfc4309_decrypt;
Joy Latten4a49b492007-12-12 20:25:13 +0800835
Herbert Xu81c4c352015-07-14 16:53:18 +0800836 inst->free = crypto_rfc4309_free;
837
838 err = aead_register_instance(tmpl, inst);
839 if (err)
840 goto out_drop_alg;
Joy Latten4a49b492007-12-12 20:25:13 +0800841
842out:
Herbert Xu81c4c352015-07-14 16:53:18 +0800843 return err;
Joy Latten4a49b492007-12-12 20:25:13 +0800844
845out_drop_alg:
846 crypto_drop_aead(spawn);
847out_free_inst:
848 kfree(inst);
Joy Latten4a49b492007-12-12 20:25:13 +0800849 goto out;
850}
851
Joy Latten4a49b492007-12-12 20:25:13 +0800852static struct crypto_template crypto_rfc4309_tmpl = {
853 .name = "rfc4309",
Herbert Xu81c4c352015-07-14 16:53:18 +0800854 .create = crypto_rfc4309_create,
Joy Latten4a49b492007-12-12 20:25:13 +0800855 .module = THIS_MODULE,
856};
857
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000858static int crypto_cbcmac_digest_setkey(struct crypto_shash *parent,
859 const u8 *inkey, unsigned int keylen)
860{
861 struct cbcmac_tfm_ctx *ctx = crypto_shash_ctx(parent);
862
863 return crypto_cipher_setkey(ctx->child, inkey, keylen);
864}
865
866static int crypto_cbcmac_digest_init(struct shash_desc *pdesc)
867{
868 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
869 int bs = crypto_shash_digestsize(pdesc->tfm);
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000870 u8 *dg = (u8 *)ctx + crypto_shash_descsize(pdesc->tfm) - bs;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000871
872 ctx->len = 0;
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000873 memset(dg, 0, bs);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000874
875 return 0;
876}
877
878static int crypto_cbcmac_digest_update(struct shash_desc *pdesc, const u8 *p,
879 unsigned int len)
880{
881 struct crypto_shash *parent = pdesc->tfm;
882 struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent);
883 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
884 struct crypto_cipher *tfm = tctx->child;
885 int bs = crypto_shash_digestsize(parent);
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000886 u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000887
888 while (len > 0) {
889 unsigned int l = min(len, bs - ctx->len);
890
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000891 crypto_xor(dg + ctx->len, p, l);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000892 ctx->len +=l;
893 len -= l;
894 p += l;
895
896 if (ctx->len == bs) {
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000897 crypto_cipher_encrypt_one(tfm, dg, dg);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000898 ctx->len = 0;
899 }
900 }
901
902 return 0;
903}
904
905static int crypto_cbcmac_digest_final(struct shash_desc *pdesc, u8 *out)
906{
907 struct crypto_shash *parent = pdesc->tfm;
908 struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent);
909 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
910 struct crypto_cipher *tfm = tctx->child;
911 int bs = crypto_shash_digestsize(parent);
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000912 u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs;
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000913
914 if (ctx->len)
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000915 crypto_cipher_encrypt_one(tfm, dg, dg);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000916
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000917 memcpy(out, dg, bs);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000918 return 0;
919}
920
921static int cbcmac_init_tfm(struct crypto_tfm *tfm)
922{
923 struct crypto_cipher *cipher;
924 struct crypto_instance *inst = (void *)tfm->__crt_alg;
925 struct crypto_spawn *spawn = crypto_instance_ctx(inst);
926 struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
927
928 cipher = crypto_spawn_cipher(spawn);
929 if (IS_ERR(cipher))
930 return PTR_ERR(cipher);
931
932 ctx->child = cipher;
933
934 return 0;
935};
936
937static void cbcmac_exit_tfm(struct crypto_tfm *tfm)
938{
939 struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
940 crypto_free_cipher(ctx->child);
941}
942
943static int cbcmac_create(struct crypto_template *tmpl, struct rtattr **tb)
944{
945 struct shash_instance *inst;
946 struct crypto_alg *alg;
947 int err;
948
949 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
950 if (err)
951 return err;
952
953 alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
954 CRYPTO_ALG_TYPE_MASK);
955 if (IS_ERR(alg))
956 return PTR_ERR(alg);
957
958 inst = shash_alloc_instance("cbcmac", alg);
959 err = PTR_ERR(inst);
960 if (IS_ERR(inst))
961 goto out_put_alg;
962
963 err = crypto_init_spawn(shash_instance_ctx(inst), alg,
964 shash_crypto_instance(inst),
965 CRYPTO_ALG_TYPE_MASK);
966 if (err)
967 goto out_free_inst;
968
969 inst->alg.base.cra_priority = alg->cra_priority;
970 inst->alg.base.cra_blocksize = 1;
971
972 inst->alg.digestsize = alg->cra_blocksize;
Ard Biesheuvel5338ad72017-02-11 19:25:21 +0000973 inst->alg.descsize = ALIGN(sizeof(struct cbcmac_desc_ctx),
974 alg->cra_alignmask + 1) +
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +0000975 alg->cra_blocksize;
976
977 inst->alg.base.cra_ctxsize = sizeof(struct cbcmac_tfm_ctx);
978 inst->alg.base.cra_init = cbcmac_init_tfm;
979 inst->alg.base.cra_exit = cbcmac_exit_tfm;
980
981 inst->alg.init = crypto_cbcmac_digest_init;
982 inst->alg.update = crypto_cbcmac_digest_update;
983 inst->alg.final = crypto_cbcmac_digest_final;
984 inst->alg.setkey = crypto_cbcmac_digest_setkey;
985
986 err = shash_register_instance(tmpl, inst);
987
988out_free_inst:
989 if (err)
990 shash_free_instance(shash_crypto_instance(inst));
991
992out_put_alg:
993 crypto_mod_put(alg);
994 return err;
995}
996
997static struct crypto_template crypto_cbcmac_tmpl = {
998 .name = "cbcmac",
999 .create = cbcmac_create,
1000 .free = shash_free_instance,
1001 .module = THIS_MODULE,
1002};
1003
Joy Latten4a49b492007-12-12 20:25:13 +08001004static int __init crypto_ccm_module_init(void)
1005{
1006 int err;
1007
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +00001008 err = crypto_register_template(&crypto_cbcmac_tmpl);
Joy Latten4a49b492007-12-12 20:25:13 +08001009 if (err)
1010 goto out;
1011
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +00001012 err = crypto_register_template(&crypto_ccm_base_tmpl);
1013 if (err)
1014 goto out_undo_cbcmac;
1015
Joy Latten4a49b492007-12-12 20:25:13 +08001016 err = crypto_register_template(&crypto_ccm_tmpl);
1017 if (err)
1018 goto out_undo_base;
1019
1020 err = crypto_register_template(&crypto_rfc4309_tmpl);
1021 if (err)
1022 goto out_undo_ccm;
1023
1024out:
1025 return err;
1026
1027out_undo_ccm:
1028 crypto_unregister_template(&crypto_ccm_tmpl);
1029out_undo_base:
1030 crypto_unregister_template(&crypto_ccm_base_tmpl);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +00001031out_undo_cbcmac:
1032 crypto_register_template(&crypto_cbcmac_tmpl);
Joy Latten4a49b492007-12-12 20:25:13 +08001033 goto out;
1034}
1035
1036static void __exit crypto_ccm_module_exit(void)
1037{
1038 crypto_unregister_template(&crypto_rfc4309_tmpl);
1039 crypto_unregister_template(&crypto_ccm_tmpl);
1040 crypto_unregister_template(&crypto_ccm_base_tmpl);
Ard Biesheuvelf15f05b2017-02-03 14:49:36 +00001041 crypto_unregister_template(&crypto_cbcmac_tmpl);
Joy Latten4a49b492007-12-12 20:25:13 +08001042}
1043
1044module_init(crypto_ccm_module_init);
1045module_exit(crypto_ccm_module_exit);
1046
1047MODULE_LICENSE("GPL");
1048MODULE_DESCRIPTION("Counter with CBC MAC");
Kees Cook5d26a102014-11-20 17:05:53 -08001049MODULE_ALIAS_CRYPTO("ccm_base");
1050MODULE_ALIAS_CRYPTO("rfc4309");
Kees Cook4943ba12014-11-24 16:32:38 -08001051MODULE_ALIAS_CRYPTO("ccm");