1// SPDX-License-Identifier: GPL-2.0-only
2
3/*
4 * Copyright (C) 2021, Linaro Limited. All rights reserved.
5 */
6#include <linux/dma-mapping.h>
7#include <linux/interrupt.h>
8#include <crypto/gcm.h>
9#include <crypto/authenc.h>
10#include <crypto/internal/aead.h>
11#include <crypto/internal/des.h>
12#include <crypto/sha1.h>
13#include <crypto/sha2.h>
14#include <crypto/scatterwalk.h>
15#include "aead.h"
16
17#define CCM_NONCE_ADATA_SHIFT 6
18#define CCM_NONCE_AUTHSIZE_SHIFT 3
19#define MAX_CCM_ADATA_HEADER_LEN 6
20
21static LIST_HEAD(aead_algs);
22
23static void qce_aead_done(void *data)
24{
25 struct crypto_async_request *async_req = data;
26 struct aead_request *req = aead_request_cast(req: async_req);
27 struct qce_aead_reqctx *rctx = aead_request_ctx_dma(req);
28 struct qce_aead_ctx *ctx = crypto_tfm_ctx(tfm: async_req->tfm);
29 struct qce_alg_template *tmpl = to_aead_tmpl(tfm: crypto_aead_reqtfm(req));
30 struct qce_device *qce = tmpl->qce;
31 struct qce_result_dump *result_buf = qce->dma.result_buf;
32 enum dma_data_direction dir_src, dir_dst;
33 bool diff_dst;
34 int error;
35 u32 status;
36 unsigned int totallen;
37 unsigned char tag[SHA256_DIGEST_SIZE] = {0};
38 int ret = 0;
39
40 diff_dst = (req->src != req->dst) ? true : false;
41 dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL;
42 dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL;
43
44 error = qce_dma_terminate_all(dma: &qce->dma);
45 if (error)
46 dev_dbg(qce->dev, "aead dma termination error (%d)\n",
47 error);
48 if (diff_dst)
49 dma_unmap_sg(qce->dev, rctx->src_sg, rctx->src_nents, dir_src);
50
51 dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
52
53 if (IS_CCM(rctx->flags)) {
54 if (req->assoclen) {
55 sg_free_table(&rctx->src_tbl);
56 if (diff_dst)
57 sg_free_table(&rctx->dst_tbl);
58 } else {
59 if (!(IS_DECRYPT(rctx->flags) && !diff_dst))
60 sg_free_table(&rctx->dst_tbl);
61 }
62 } else {
63 sg_free_table(&rctx->dst_tbl);
64 }
65
66 error = qce_check_status(qce, status: &status);
67 if (error < 0 && (error != -EBADMSG))
68 dev_err(qce->dev, "aead operation error (%x)\n", status);
69
70 if (IS_ENCRYPT(rctx->flags)) {
71 totallen = req->cryptlen + req->assoclen;
72 if (IS_CCM(rctx->flags))
73 scatterwalk_map_and_copy(buf: rctx->ccmresult_buf, sg: req->dst,
74 start: totallen, nbytes: ctx->authsize, out: 1);
75 else
76 scatterwalk_map_and_copy(buf: result_buf->auth_iv, sg: req->dst,
77 start: totallen, nbytes: ctx->authsize, out: 1);
78
79 } else if (!IS_CCM(rctx->flags)) {
80 totallen = req->cryptlen + req->assoclen - ctx->authsize;
81 scatterwalk_map_and_copy(buf: tag, sg: req->src, start: totallen, nbytes: ctx->authsize, out: 0);
82 ret = memcmp(p: result_buf->auth_iv, q: tag, size: ctx->authsize);
83 if (ret) {
84 pr_err("Bad message error\n");
85 error = -EBADMSG;
86 }
87 }
88
89 qce->async_req_done(qce, error);
90}
91
92static struct scatterlist *
93qce_aead_prepare_result_buf(struct sg_table *tbl, struct aead_request *req)
94{
95 struct qce_aead_reqctx *rctx = aead_request_ctx_dma(req);
96 struct qce_alg_template *tmpl = to_aead_tmpl(tfm: crypto_aead_reqtfm(req));
97 struct qce_device *qce = tmpl->qce;
98
99 sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ);
100 return qce_sgtable_add(sgt: tbl, sg_add: &rctx->result_sg, QCE_RESULT_BUF_SZ);
101}
102
103static struct scatterlist *
104qce_aead_prepare_ccm_result_buf(struct sg_table *tbl, struct aead_request *req)
105{
106 struct qce_aead_reqctx *rctx = aead_request_ctx_dma(req);
107
108 sg_init_one(&rctx->result_sg, rctx->ccmresult_buf, QCE_BAM_BURST_SIZE);
109 return qce_sgtable_add(sgt: tbl, sg_add: &rctx->result_sg, QCE_BAM_BURST_SIZE);
110}
111
112static struct scatterlist *
113qce_aead_prepare_dst_buf(struct aead_request *req)
114{
115 struct qce_aead_reqctx *rctx = aead_request_ctx_dma(req);
116 struct qce_alg_template *tmpl = to_aead_tmpl(tfm: crypto_aead_reqtfm(req));
117 struct qce_device *qce = tmpl->qce;
118 struct scatterlist *sg, *msg_sg, __sg[2];
119 gfp_t gfp;
120 unsigned int assoclen = req->assoclen;
121 unsigned int totallen;
122 int ret;
123
124 totallen = rctx->cryptlen + assoclen;
125 rctx->dst_nents = sg_nents_for_len(sg: req->dst, len: totallen);
126 if (rctx->dst_nents < 0) {
127 dev_err(qce->dev, "Invalid numbers of dst SG.\n");
128 return ERR_PTR(error: -EINVAL);
129 }
130 if (IS_CCM(rctx->flags))
131 rctx->dst_nents += 2;
132 else
133 rctx->dst_nents += 1;
134
135 gfp = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
136 GFP_KERNEL : GFP_ATOMIC;
137 ret = sg_alloc_table(&rctx->dst_tbl, rctx->dst_nents, gfp);
138 if (ret)
139 return ERR_PTR(error: ret);
140
141 if (IS_CCM(rctx->flags) && assoclen) {
142 /* Get the dst buffer */
143 msg_sg = scatterwalk_ffwd(dst: __sg, src: req->dst, len: assoclen);
144
145 sg = qce_sgtable_add(sgt: &rctx->dst_tbl, sg_add: &rctx->adata_sg,
146 max_len: rctx->assoclen);
147 if (IS_ERR(ptr: sg)) {
148 ret = PTR_ERR(ptr: sg);
149 goto dst_tbl_free;
150 }
151 /* dst buffer */
152 sg = qce_sgtable_add(sgt: &rctx->dst_tbl, sg_add: msg_sg, max_len: rctx->cryptlen);
153 if (IS_ERR(ptr: sg)) {
154 ret = PTR_ERR(ptr: sg);
155 goto dst_tbl_free;
156 }
157 totallen = rctx->cryptlen + rctx->assoclen;
158 } else {
159 if (totallen) {
160 sg = qce_sgtable_add(sgt: &rctx->dst_tbl, sg_add: req->dst, max_len: totallen);
161 if (IS_ERR(ptr: sg))
162 goto dst_tbl_free;
163 }
164 }
165 if (IS_CCM(rctx->flags))
166 sg = qce_aead_prepare_ccm_result_buf(tbl: &rctx->dst_tbl, req);
167 else
168 sg = qce_aead_prepare_result_buf(tbl: &rctx->dst_tbl, req);
169
170 if (IS_ERR(ptr: sg))
171 goto dst_tbl_free;
172
173 sg_mark_end(sg);
174 rctx->dst_sg = rctx->dst_tbl.sgl;
175 rctx->dst_nents = sg_nents_for_len(sg: rctx->dst_sg, len: totallen) + 1;
176
177 return sg;
178
179dst_tbl_free:
180 sg_free_table(&rctx->dst_tbl);
181 return sg;
182}
183
184static int
185qce_aead_ccm_prepare_buf_assoclen(struct aead_request *req)
186{
187 struct scatterlist *sg, *msg_sg, __sg[2];
188 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
189 struct qce_aead_reqctx *rctx = aead_request_ctx_dma(req);
190 struct qce_aead_ctx *ctx = crypto_aead_ctx(tfm);
191 unsigned int assoclen = rctx->assoclen;
192 unsigned int adata_header_len, cryptlen, totallen;
193 gfp_t gfp;
194 bool diff_dst;
195 int ret;
196
197 if (IS_DECRYPT(rctx->flags))
198 cryptlen = rctx->cryptlen + ctx->authsize;
199 else
200 cryptlen = rctx->cryptlen;
201 totallen = cryptlen + req->assoclen;
202
203 /* Get the msg */
204 msg_sg = scatterwalk_ffwd(dst: __sg, src: req->src, len: req->assoclen);
205
206 rctx->adata = kzalloc((ALIGN(assoclen, 16) + MAX_CCM_ADATA_HEADER_LEN) *
207 sizeof(unsigned char), GFP_ATOMIC);
208 if (!rctx->adata)
209 return -ENOMEM;
210
211 /*
212 * Format associated data (RFC3610 and NIST 800-38C)
213 * Even though specification allows for AAD to be up to 2^64 - 1 bytes,
214 * the assoclen field in aead_request is unsigned int and thus limits
215 * the AAD to be up to 2^32 - 1 bytes. So we handle only two scenarios
216 * while forming the header for AAD.
217 */
218 if (assoclen < 0xff00) {
219 adata_header_len = 2;
220 *(__be16 *)rctx->adata = cpu_to_be16(assoclen);
221 } else {
222 adata_header_len = 6;
223 *(__be16 *)rctx->adata = cpu_to_be16(0xfffe);
224 *(__be32 *)(rctx->adata + 2) = cpu_to_be32(assoclen);
225 }
226
227 /* Copy the associated data */
228 if (sg_copy_to_buffer(sgl: req->src, nents: sg_nents_for_len(sg: req->src, len: assoclen),
229 buf: rctx->adata + adata_header_len,
230 buflen: assoclen) != assoclen)
231 return -EINVAL;
232
233 /* Pad associated data to block size */
234 rctx->assoclen = ALIGN(assoclen + adata_header_len, 16);
235
236 diff_dst = (req->src != req->dst) ? true : false;
237
238 if (diff_dst)
239 rctx->src_nents = sg_nents_for_len(sg: req->src, len: totallen) + 1;
240 else
241 rctx->src_nents = sg_nents_for_len(sg: req->src, len: totallen) + 2;
242
243 gfp = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? GFP_KERNEL : GFP_ATOMIC;
244 ret = sg_alloc_table(&rctx->src_tbl, rctx->src_nents, gfp);
245 if (ret)
246 return ret;
247
248 /* Associated Data */
249 sg_init_one(&rctx->adata_sg, rctx->adata, rctx->assoclen);
250 sg = qce_sgtable_add(sgt: &rctx->src_tbl, sg_add: &rctx->adata_sg,
251 max_len: rctx->assoclen);
252 if (IS_ERR(ptr: sg)) {
253 ret = PTR_ERR(ptr: sg);
254 goto err_free;
255 }
256 /* src msg */
257 sg = qce_sgtable_add(sgt: &rctx->src_tbl, sg_add: msg_sg, max_len: cryptlen);
258 if (IS_ERR(ptr: sg)) {
259 ret = PTR_ERR(ptr: sg);
260 goto err_free;
261 }
262 if (!diff_dst) {
263 /*
264 * For decrypt, when src and dst buffers are same, there is already space
265 * in the buffer for padded 0's which is output in lieu of
266 * the MAC that is input. So skip the below.
267 */
268 if (!IS_DECRYPT(rctx->flags)) {
269 sg = qce_aead_prepare_ccm_result_buf(tbl: &rctx->src_tbl, req);
270 if (IS_ERR(ptr: sg)) {
271 ret = PTR_ERR(ptr: sg);
272 goto err_free;
273 }
274 }
275 }
276 sg_mark_end(sg);
277 rctx->src_sg = rctx->src_tbl.sgl;
278 totallen = cryptlen + rctx->assoclen;
279 rctx->src_nents = sg_nents_for_len(sg: rctx->src_sg, len: totallen);
280
281 if (diff_dst) {
282 sg = qce_aead_prepare_dst_buf(req);
283 if (IS_ERR(ptr: sg)) {
284 ret = PTR_ERR(ptr: sg);
285 goto err_free;
286 }
287 } else {
288 if (IS_ENCRYPT(rctx->flags))
289 rctx->dst_nents = rctx->src_nents + 1;
290 else
291 rctx->dst_nents = rctx->src_nents;
292 rctx->dst_sg = rctx->src_sg;
293 }
294
295 return 0;
296err_free:
297 sg_free_table(&rctx->src_tbl);
298 return ret;
299}
300
301static int qce_aead_prepare_buf(struct aead_request *req)
302{
303 struct qce_aead_reqctx *rctx = aead_request_ctx_dma(req);
304 struct qce_alg_template *tmpl = to_aead_tmpl(tfm: crypto_aead_reqtfm(req));
305 struct qce_device *qce = tmpl->qce;
306 struct scatterlist *sg;
307 bool diff_dst = (req->src != req->dst) ? true : false;
308 unsigned int totallen;
309
310 totallen = rctx->cryptlen + rctx->assoclen;
311
312 sg = qce_aead_prepare_dst_buf(req);
313 if (IS_ERR(ptr: sg))
314 return PTR_ERR(ptr: sg);
315 if (diff_dst) {
316 rctx->src_nents = sg_nents_for_len(sg: req->src, len: totallen);
317 if (rctx->src_nents < 0) {
318 dev_err(qce->dev, "Invalid numbers of src SG.\n");
319 return -EINVAL;
320 }
321 rctx->src_sg = req->src;
322 } else {
323 rctx->src_nents = rctx->dst_nents - 1;
324 rctx->src_sg = rctx->dst_sg;
325 }
326 return 0;
327}
328
329static int qce_aead_ccm_prepare_buf(struct aead_request *req)
330{
331 struct qce_aead_reqctx *rctx = aead_request_ctx_dma(req);
332 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
333 struct qce_aead_ctx *ctx = crypto_aead_ctx(tfm);
334 struct scatterlist *sg;
335 bool diff_dst = (req->src != req->dst) ? true : false;
336 unsigned int cryptlen;
337
338 if (rctx->assoclen)
339 return qce_aead_ccm_prepare_buf_assoclen(req);
340
341 if (IS_ENCRYPT(rctx->flags))
342 return qce_aead_prepare_buf(req);
343
344 cryptlen = rctx->cryptlen + ctx->authsize;
345 if (diff_dst) {
346 rctx->src_nents = sg_nents_for_len(sg: req->src, len: cryptlen);
347 rctx->src_sg = req->src;
348 sg = qce_aead_prepare_dst_buf(req);
349 if (IS_ERR(ptr: sg))
350 return PTR_ERR(ptr: sg);
351 } else {
352 rctx->src_nents = sg_nents_for_len(sg: req->src, len: cryptlen);
353 rctx->src_sg = req->src;
354 rctx->dst_nents = rctx->src_nents;
355 rctx->dst_sg = rctx->src_sg;
356 }
357
358 return 0;
359}
360
361static int qce_aead_create_ccm_nonce(struct qce_aead_reqctx *rctx, struct qce_aead_ctx *ctx)
362{
363 unsigned int msglen_size, ivsize;
364 u8 msg_len[4];
365 int i;
366
367 if (!rctx || !rctx->iv)
368 return -EINVAL;
369
370 msglen_size = rctx->iv[0] + 1;
371
372 /* Verify that msg len size is valid */
373 if (msglen_size < 2 || msglen_size > 8)
374 return -EINVAL;
375
376 ivsize = rctx->ivsize;
377
378 /*
379 * Clear the msglen bytes in IV.
380 * Else the h/w engine and nonce will use any stray value pending there.
381 */
382 if (!IS_CCM_RFC4309(rctx->flags)) {
383 for (i = 0; i < msglen_size; i++)
384 rctx->iv[ivsize - i - 1] = 0;
385 }
386
387 /*
388 * The crypto framework encodes cryptlen as unsigned int. Thus, even though
389 * spec allows for upto 8 bytes to encode msg_len only 4 bytes are needed.
390 */
391 if (msglen_size > 4)
392 msglen_size = 4;
393
394 memcpy(&msg_len[0], &rctx->cryptlen, 4);
395
396 memcpy(&rctx->ccm_nonce[0], rctx->iv, rctx->ivsize);
397 if (rctx->assoclen)
398 rctx->ccm_nonce[0] |= 1 << CCM_NONCE_ADATA_SHIFT;
399 rctx->ccm_nonce[0] |= ((ctx->authsize - 2) / 2) <<
400 CCM_NONCE_AUTHSIZE_SHIFT;
401 for (i = 0; i < msglen_size; i++)
402 rctx->ccm_nonce[QCE_MAX_NONCE - i - 1] = msg_len[i];
403
404 return 0;
405}
406
407static int
408qce_aead_async_req_handle(struct crypto_async_request *async_req)
409{
410 struct aead_request *req = aead_request_cast(req: async_req);
411 struct qce_aead_reqctx *rctx = aead_request_ctx_dma(req);
412 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
413 struct qce_aead_ctx *ctx = crypto_tfm_ctx(tfm: async_req->tfm);
414 struct qce_alg_template *tmpl = to_aead_tmpl(tfm: crypto_aead_reqtfm(req));
415 struct qce_device *qce = tmpl->qce;
416 enum dma_data_direction dir_src, dir_dst;
417 bool diff_dst;
418 int dst_nents, src_nents, ret;
419
420 if (IS_CCM_RFC4309(rctx->flags)) {
421 memset(rctx->ccm_rfc4309_iv, 0, QCE_MAX_IV_SIZE);
422 rctx->ccm_rfc4309_iv[0] = 3;
423 memcpy(&rctx->ccm_rfc4309_iv[1], ctx->ccm4309_salt, QCE_CCM4309_SALT_SIZE);
424 memcpy(&rctx->ccm_rfc4309_iv[4], req->iv, 8);
425 rctx->iv = rctx->ccm_rfc4309_iv;
426 rctx->ivsize = AES_BLOCK_SIZE;
427 } else {
428 rctx->iv = req->iv;
429 rctx->ivsize = crypto_aead_ivsize(tfm);
430 }
431 if (IS_CCM_RFC4309(rctx->flags))
432 rctx->assoclen = req->assoclen - 8;
433 else
434 rctx->assoclen = req->assoclen;
435
436 diff_dst = (req->src != req->dst) ? true : false;
437 dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL;
438 dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL;
439
440 if (IS_CCM(rctx->flags)) {
441 ret = qce_aead_create_ccm_nonce(rctx, ctx);
442 if (ret)
443 return ret;
444 }
445 if (IS_CCM(rctx->flags))
446 ret = qce_aead_ccm_prepare_buf(req);
447 else
448 ret = qce_aead_prepare_buf(req);
449
450 if (ret)
451 return ret;
452 dst_nents = dma_map_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
453 if (!dst_nents) {
454 ret = -EIO;
455 goto error_free;
456 }
457
458 if (diff_dst) {
459 src_nents = dma_map_sg(qce->dev, rctx->src_sg, rctx->src_nents, dir_src);
460 if (src_nents < 0) {
461 ret = src_nents;
462 goto error_unmap_dst;
463 }
464 } else {
465 if (IS_CCM(rctx->flags) && IS_DECRYPT(rctx->flags))
466 src_nents = dst_nents;
467 else
468 src_nents = dst_nents - 1;
469 }
470
471 ret = qce_dma_prep_sgs(dma: &qce->dma, sg_in: rctx->src_sg, in_ents: src_nents, sg_out: rctx->dst_sg, out_ents: dst_nents,
472 cb: qce_aead_done, cb_param: async_req);
473 if (ret)
474 goto error_unmap_src;
475
476 qce_dma_issue_pending(dma: &qce->dma);
477
478 ret = qce_start(async_req, type: tmpl->crypto_alg_type);
479 if (ret)
480 goto error_terminate;
481
482 return 0;
483
484error_terminate:
485 qce_dma_terminate_all(dma: &qce->dma);
486error_unmap_src:
487 if (diff_dst)
488 dma_unmap_sg(qce->dev, req->src, rctx->src_nents, dir_src);
489error_unmap_dst:
490 dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
491error_free:
492 if (IS_CCM(rctx->flags) && rctx->assoclen) {
493 sg_free_table(&rctx->src_tbl);
494 if (diff_dst)
495 sg_free_table(&rctx->dst_tbl);
496 } else {
497 sg_free_table(&rctx->dst_tbl);
498 }
499 return ret;
500}
501
502static int qce_aead_crypt(struct aead_request *req, int encrypt)
503{
504 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
505 struct qce_aead_reqctx *rctx = aead_request_ctx_dma(req);
506 struct qce_aead_ctx *ctx = crypto_aead_ctx(tfm);
507 struct qce_alg_template *tmpl = to_aead_tmpl(tfm);
508 unsigned int blocksize = crypto_aead_blocksize(tfm);
509
510 rctx->flags = tmpl->alg_flags;
511 rctx->flags |= encrypt ? QCE_ENCRYPT : QCE_DECRYPT;
512
513 if (encrypt)
514 rctx->cryptlen = req->cryptlen;
515 else
516 rctx->cryptlen = req->cryptlen - ctx->authsize;
517
518 /* CE does not handle 0 length messages */
519 if (!rctx->cryptlen) {
520 if (!(IS_CCM(rctx->flags) && IS_DECRYPT(rctx->flags)))
521 ctx->need_fallback = true;
522 }
523
524 /* If fallback is needed, schedule and exit */
525 if (ctx->need_fallback) {
526 /* Reset need_fallback in case the same ctx is used for another transaction */
527 ctx->need_fallback = false;
528
529 aead_request_set_tfm(req: &rctx->fallback_req, tfm: ctx->fallback);
530 aead_request_set_callback(req: &rctx->fallback_req, flags: req->base.flags,
531 compl: req->base.complete, data: req->base.data);
532 aead_request_set_crypt(req: &rctx->fallback_req, src: req->src,
533 dst: req->dst, cryptlen: req->cryptlen, iv: req->iv);
534 aead_request_set_ad(req: &rctx->fallback_req, assoclen: req->assoclen);
535
536 return encrypt ? crypto_aead_encrypt(req: &rctx->fallback_req) :
537 crypto_aead_decrypt(req: &rctx->fallback_req);
538 }
539
540 /*
541 * CBC algorithms require message lengths to be
542 * multiples of block size.
543 */
544 if (IS_CBC(rctx->flags) && !IS_ALIGNED(rctx->cryptlen, blocksize))
545 return -EINVAL;
546
547 /* RFC4309 supported AAD size 16 bytes/20 bytes */
548 if (IS_CCM_RFC4309(rctx->flags))
549 if (crypto_ipsec_check_assoclen(assoclen: req->assoclen))
550 return -EINVAL;
551
552 return tmpl->qce->async_req_enqueue(tmpl->qce, &req->base);
553}
554
555static int qce_aead_encrypt(struct aead_request *req)
556{
557 return qce_aead_crypt(req, encrypt: 1);
558}
559
560static int qce_aead_decrypt(struct aead_request *req)
561{
562 return qce_aead_crypt(req, encrypt: 0);
563}
564
565static int qce_aead_ccm_setkey(struct crypto_aead *tfm, const u8 *key,
566 unsigned int keylen)
567{
568 struct qce_aead_ctx *ctx = crypto_aead_ctx(tfm);
569 unsigned long flags = to_aead_tmpl(tfm)->alg_flags;
570
571 if (IS_CCM_RFC4309(flags)) {
572 if (keylen < QCE_CCM4309_SALT_SIZE)
573 return -EINVAL;
574 keylen -= QCE_CCM4309_SALT_SIZE;
575 memcpy(ctx->ccm4309_salt, key + keylen, QCE_CCM4309_SALT_SIZE);
576 }
577
578 if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_256 && keylen != AES_KEYSIZE_192)
579 return -EINVAL;
580
581 ctx->enc_keylen = keylen;
582 ctx->auth_keylen = keylen;
583
584 memcpy(ctx->enc_key, key, keylen);
585 memcpy(ctx->auth_key, key, keylen);
586
587 if (keylen == AES_KEYSIZE_192)
588 ctx->need_fallback = true;
589
590 return IS_CCM_RFC4309(flags) ?
591 crypto_aead_setkey(tfm: ctx->fallback, key, keylen: keylen + QCE_CCM4309_SALT_SIZE) :
592 crypto_aead_setkey(tfm: ctx->fallback, key, keylen);
593}
594
595static int qce_aead_setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen)
596{
597 struct qce_aead_ctx *ctx = crypto_aead_ctx(tfm);
598 struct crypto_authenc_keys authenc_keys;
599 unsigned long flags = to_aead_tmpl(tfm)->alg_flags;
600 u32 _key[6];
601 int err;
602
603 err = crypto_authenc_extractkeys(keys: &authenc_keys, key, keylen);
604 if (err)
605 return err;
606
607 if (authenc_keys.enckeylen > QCE_MAX_KEY_SIZE ||
608 authenc_keys.authkeylen > QCE_MAX_KEY_SIZE)
609 return -EINVAL;
610
611 if (IS_DES(flags)) {
612 err = verify_aead_des_key(tfm, key: authenc_keys.enckey, keylen: authenc_keys.enckeylen);
613 if (err)
614 return err;
615 } else if (IS_3DES(flags)) {
616 err = verify_aead_des3_key(tfm, key: authenc_keys.enckey, keylen: authenc_keys.enckeylen);
617 if (err)
618 return err;
619 /*
620 * The crypto engine does not support any two keys
621 * being the same for triple des algorithms. The
622 * verify_skcipher_des3_key does not check for all the
623 * below conditions. Schedule fallback in this case.
624 */
625 memcpy(_key, authenc_keys.enckey, DES3_EDE_KEY_SIZE);
626 if (!((_key[0] ^ _key[2]) | (_key[1] ^ _key[3])) ||
627 !((_key[2] ^ _key[4]) | (_key[3] ^ _key[5])) ||
628 !((_key[0] ^ _key[4]) | (_key[1] ^ _key[5])))
629 ctx->need_fallback = true;
630 } else if (IS_AES(flags)) {
631 /* No random key sizes */
632 if (authenc_keys.enckeylen != AES_KEYSIZE_128 &&
633 authenc_keys.enckeylen != AES_KEYSIZE_192 &&
634 authenc_keys.enckeylen != AES_KEYSIZE_256)
635 return -EINVAL;
636 if (authenc_keys.enckeylen == AES_KEYSIZE_192)
637 ctx->need_fallback = true;
638 }
639
640 ctx->enc_keylen = authenc_keys.enckeylen;
641 ctx->auth_keylen = authenc_keys.authkeylen;
642
643 memcpy(ctx->enc_key, authenc_keys.enckey, authenc_keys.enckeylen);
644
645 memset(ctx->auth_key, 0, sizeof(ctx->auth_key));
646 memcpy(ctx->auth_key, authenc_keys.authkey, authenc_keys.authkeylen);
647
648 return crypto_aead_setkey(tfm: ctx->fallback, key, keylen);
649}
650
651static int qce_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
652{
653 struct qce_aead_ctx *ctx = crypto_aead_ctx(tfm);
654 unsigned long flags = to_aead_tmpl(tfm)->alg_flags;
655
656 if (IS_CCM(flags)) {
657 if (authsize < 4 || authsize > 16 || authsize % 2)
658 return -EINVAL;
659 if (IS_CCM_RFC4309(flags) && (authsize < 8 || authsize % 4))
660 return -EINVAL;
661 }
662 ctx->authsize = authsize;
663
664 return crypto_aead_setauthsize(tfm: ctx->fallback, authsize);
665}
666
667static int qce_aead_init(struct crypto_aead *tfm)
668{
669 struct qce_aead_ctx *ctx = crypto_aead_ctx(tfm);
670
671 ctx->need_fallback = false;
672 ctx->fallback = crypto_alloc_aead(alg_name: crypto_tfm_alg_name(tfm: &tfm->base),
673 type: 0, CRYPTO_ALG_NEED_FALLBACK);
674
675 if (IS_ERR(ptr: ctx->fallback))
676 return PTR_ERR(ptr: ctx->fallback);
677
678 crypto_aead_set_reqsize_dma(aead: tfm, reqsize: sizeof(struct qce_aead_reqctx) +
679 crypto_aead_reqsize(tfm: ctx->fallback));
680 return 0;
681}
682
683static void qce_aead_exit(struct crypto_aead *tfm)
684{
685 struct qce_aead_ctx *ctx = crypto_aead_ctx(tfm);
686
687 crypto_free_aead(tfm: ctx->fallback);
688}
689
690struct qce_aead_def {
691 unsigned long flags;
692 const char *name;
693 const char *drv_name;
694 unsigned int blocksize;
695 unsigned int chunksize;
696 unsigned int ivsize;
697 unsigned int maxauthsize;
698};
699
700static const struct qce_aead_def aead_def[] = {
701 {
702 .flags = QCE_ALG_DES | QCE_MODE_CBC | QCE_HASH_SHA1_HMAC,
703 .name = "authenc(hmac(sha1),cbc(des))",
704 .drv_name = "authenc-hmac-sha1-cbc-des-qce",
705 .blocksize = DES_BLOCK_SIZE,
706 .ivsize = DES_BLOCK_SIZE,
707 .maxauthsize = SHA1_DIGEST_SIZE,
708 },
709 {
710 .flags = QCE_ALG_3DES | QCE_MODE_CBC | QCE_HASH_SHA1_HMAC,
711 .name = "authenc(hmac(sha1),cbc(des3_ede))",
712 .drv_name = "authenc-hmac-sha1-cbc-3des-qce",
713 .blocksize = DES3_EDE_BLOCK_SIZE,
714 .ivsize = DES3_EDE_BLOCK_SIZE,
715 .maxauthsize = SHA1_DIGEST_SIZE,
716 },
717 {
718 .flags = QCE_ALG_DES | QCE_MODE_CBC | QCE_HASH_SHA256_HMAC,
719 .name = "authenc(hmac(sha256),cbc(des))",
720 .drv_name = "authenc-hmac-sha256-cbc-des-qce",
721 .blocksize = DES_BLOCK_SIZE,
722 .ivsize = DES_BLOCK_SIZE,
723 .maxauthsize = SHA256_DIGEST_SIZE,
724 },
725 {
726 .flags = QCE_ALG_3DES | QCE_MODE_CBC | QCE_HASH_SHA256_HMAC,
727 .name = "authenc(hmac(sha256),cbc(des3_ede))",
728 .drv_name = "authenc-hmac-sha256-cbc-3des-qce",
729 .blocksize = DES3_EDE_BLOCK_SIZE,
730 .ivsize = DES3_EDE_BLOCK_SIZE,
731 .maxauthsize = SHA256_DIGEST_SIZE,
732 },
733 {
734 .flags = QCE_ALG_AES | QCE_MODE_CBC | QCE_HASH_SHA256_HMAC,
735 .name = "authenc(hmac(sha256),cbc(aes))",
736 .drv_name = "authenc-hmac-sha256-cbc-aes-qce",
737 .blocksize = AES_BLOCK_SIZE,
738 .ivsize = AES_BLOCK_SIZE,
739 .maxauthsize = SHA256_DIGEST_SIZE,
740 },
741 {
742 .flags = QCE_ALG_AES | QCE_MODE_CCM,
743 .name = "ccm(aes)",
744 .drv_name = "ccm-aes-qce",
745 .blocksize = 1,
746 .ivsize = AES_BLOCK_SIZE,
747 .maxauthsize = AES_BLOCK_SIZE,
748 },
749 {
750 .flags = QCE_ALG_AES | QCE_MODE_CCM | QCE_MODE_CCM_RFC4309,
751 .name = "rfc4309(ccm(aes))",
752 .drv_name = "rfc4309-ccm-aes-qce",
753 .blocksize = 1,
754 .ivsize = 8,
755 .maxauthsize = AES_BLOCK_SIZE,
756 },
757};
758
759static int qce_aead_register_one(const struct qce_aead_def *def, struct qce_device *qce)
760{
761 struct qce_alg_template *tmpl;
762 struct aead_alg *alg;
763 int ret;
764
765 tmpl = kzalloc(sizeof(*tmpl), GFP_KERNEL);
766 if (!tmpl)
767 return -ENOMEM;
768
769 alg = &tmpl->alg.aead;
770
771 snprintf(buf: alg->base.cra_name, CRYPTO_MAX_ALG_NAME, fmt: "%s", def->name);
772 snprintf(buf: alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, fmt: "%s",
773 def->drv_name);
774
775 alg->base.cra_blocksize = def->blocksize;
776 alg->chunksize = def->chunksize;
777 alg->ivsize = def->ivsize;
778 alg->maxauthsize = def->maxauthsize;
779 if (IS_CCM(def->flags))
780 alg->setkey = qce_aead_ccm_setkey;
781 else
782 alg->setkey = qce_aead_setkey;
783 alg->setauthsize = qce_aead_setauthsize;
784 alg->encrypt = qce_aead_encrypt;
785 alg->decrypt = qce_aead_decrypt;
786 alg->init = qce_aead_init;
787 alg->exit = qce_aead_exit;
788
789 alg->base.cra_priority = 275;
790 alg->base.cra_flags = CRYPTO_ALG_ASYNC |
791 CRYPTO_ALG_ALLOCATES_MEMORY |
792 CRYPTO_ALG_KERN_DRIVER_ONLY |
793 CRYPTO_ALG_NEED_FALLBACK;
794 alg->base.cra_ctxsize = sizeof(struct qce_aead_ctx);
795 alg->base.cra_alignmask = 0;
796 alg->base.cra_module = THIS_MODULE;
797
798 INIT_LIST_HEAD(list: &tmpl->entry);
799 tmpl->crypto_alg_type = CRYPTO_ALG_TYPE_AEAD;
800 tmpl->alg_flags = def->flags;
801 tmpl->qce = qce;
802
803 ret = crypto_register_aead(alg);
804 if (ret) {
805 dev_err(qce->dev, "%s registration failed\n", alg->base.cra_name);
806 kfree(objp: tmpl);
807 return ret;
808 }
809
810 list_add_tail(new: &tmpl->entry, head: &aead_algs);
811 dev_dbg(qce->dev, "%s is registered\n", alg->base.cra_name);
812 return 0;
813}
814
815static void qce_aead_unregister(struct qce_device *qce)
816{
817 struct qce_alg_template *tmpl, *n;
818
819 list_for_each_entry_safe(tmpl, n, &aead_algs, entry) {
820 crypto_unregister_aead(alg: &tmpl->alg.aead);
821 list_del(entry: &tmpl->entry);
822 kfree(objp: tmpl);
823 }
824}
825
826static int qce_aead_register(struct qce_device *qce)
827{
828 int ret, i;
829
830 for (i = 0; i < ARRAY_SIZE(aead_def); i++) {
831 ret = qce_aead_register_one(def: &aead_def[i], qce);
832 if (ret)
833 goto err;
834 }
835
836 return 0;
837err:
838 qce_aead_unregister(qce);
839 return ret;
840}
841
842const struct qce_algo_ops aead_ops = {
843 .type = CRYPTO_ALG_TYPE_AEAD,
844 .register_algs = qce_aead_register,
845 .unregister_algs = qce_aead_unregister,
846 .async_req_handle = qce_aead_async_req_handle,
847};
848

source code of linux/drivers/crypto/qce/aead.c