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11#include "compat.h"
12#include "regs.h"
13#include "intern.h"
14#include "jr.h"
15#include "error.h"
16#include "desc_constr.h"
17#include "sg_sw_sec4.h"
18#include "caampkc.h"
19
20#define DESC_RSA_PUB_LEN (2 * CAAM_CMD_SZ + SIZEOF_RSA_PUB_PDB)
21#define DESC_RSA_PRIV_F1_LEN (2 * CAAM_CMD_SZ + \
22 SIZEOF_RSA_PRIV_F1_PDB)
23#define DESC_RSA_PRIV_F2_LEN (2 * CAAM_CMD_SZ + \
24 SIZEOF_RSA_PRIV_F2_PDB)
25#define DESC_RSA_PRIV_F3_LEN (2 * CAAM_CMD_SZ + \
26 SIZEOF_RSA_PRIV_F3_PDB)
27#define CAAM_RSA_MAX_INPUT_SIZE 512
28
29
30static u8 *zero_buffer;
31
32
33
34
35
36static bool init_done;
37
38struct caam_akcipher_alg {
39 struct akcipher_alg akcipher;
40 bool registered;
41};
42
43static void rsa_io_unmap(struct device *dev, struct rsa_edesc *edesc,
44 struct akcipher_request *req)
45{
46 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
47
48 dma_unmap_sg(dev, req->dst, edesc->dst_nents, DMA_FROM_DEVICE);
49 dma_unmap_sg(dev, req_ctx->fixup_src, edesc->src_nents, DMA_TO_DEVICE);
50
51 if (edesc->sec4_sg_bytes)
52 dma_unmap_single(dev, edesc->sec4_sg_dma, edesc->sec4_sg_bytes,
53 DMA_TO_DEVICE);
54}
55
56static void rsa_pub_unmap(struct device *dev, struct rsa_edesc *edesc,
57 struct akcipher_request *req)
58{
59 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
60 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
61 struct caam_rsa_key *key = &ctx->key;
62 struct rsa_pub_pdb *pdb = &edesc->pdb.pub;
63
64 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
65 dma_unmap_single(dev, pdb->e_dma, key->e_sz, DMA_TO_DEVICE);
66}
67
68static void rsa_priv_f1_unmap(struct device *dev, struct rsa_edesc *edesc,
69 struct akcipher_request *req)
70{
71 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
72 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
73 struct caam_rsa_key *key = &ctx->key;
74 struct rsa_priv_f1_pdb *pdb = &edesc->pdb.priv_f1;
75
76 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
77 dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
78}
79
80static void rsa_priv_f2_unmap(struct device *dev, struct rsa_edesc *edesc,
81 struct akcipher_request *req)
82{
83 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
84 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
85 struct caam_rsa_key *key = &ctx->key;
86 struct rsa_priv_f2_pdb *pdb = &edesc->pdb.priv_f2;
87 size_t p_sz = key->p_sz;
88 size_t q_sz = key->q_sz;
89
90 dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
91 dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
92 dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
93 dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
94 dma_unmap_single(dev, pdb->tmp2_dma, q_sz, DMA_BIDIRECTIONAL);
95}
96
97static void rsa_priv_f3_unmap(struct device *dev, struct rsa_edesc *edesc,
98 struct akcipher_request *req)
99{
100 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
101 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
102 struct caam_rsa_key *key = &ctx->key;
103 struct rsa_priv_f3_pdb *pdb = &edesc->pdb.priv_f3;
104 size_t p_sz = key->p_sz;
105 size_t q_sz = key->q_sz;
106
107 dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
108 dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
109 dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE);
110 dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE);
111 dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE);
112 dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
113 dma_unmap_single(dev, pdb->tmp2_dma, q_sz, DMA_BIDIRECTIONAL);
114}
115
116
117static void rsa_pub_done(struct device *dev, u32 *desc, u32 err, void *context)
118{
119 struct akcipher_request *req = context;
120 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
121 struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
122 struct rsa_edesc *edesc;
123 int ecode = 0;
124 bool has_bklog;
125
126 if (err)
127 ecode = caam_jr_strstatus(dev, err);
128
129 edesc = req_ctx->edesc;
130 has_bklog = edesc->bklog;
131
132 rsa_pub_unmap(dev, edesc, req);
133 rsa_io_unmap(dev, edesc, req);
134 kfree(edesc);
135
136
137
138
139
140 if (!has_bklog)
141 akcipher_request_complete(req, ecode);
142 else
143 crypto_finalize_akcipher_request(jrp->engine, req, ecode);
144}
145
146static void rsa_priv_f_done(struct device *dev, u32 *desc, u32 err,
147 void *context)
148{
149 struct akcipher_request *req = context;
150 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
151 struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
152 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
153 struct caam_rsa_key *key = &ctx->key;
154 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
155 struct rsa_edesc *edesc;
156 int ecode = 0;
157 bool has_bklog;
158
159 if (err)
160 ecode = caam_jr_strstatus(dev, err);
161
162 edesc = req_ctx->edesc;
163 has_bklog = edesc->bklog;
164
165 switch (key->priv_form) {
166 case FORM1:
167 rsa_priv_f1_unmap(dev, edesc, req);
168 break;
169 case FORM2:
170 rsa_priv_f2_unmap(dev, edesc, req);
171 break;
172 case FORM3:
173 rsa_priv_f3_unmap(dev, edesc, req);
174 }
175
176 rsa_io_unmap(dev, edesc, req);
177 kfree(edesc);
178
179
180
181
182
183 if (!has_bklog)
184 akcipher_request_complete(req, ecode);
185 else
186 crypto_finalize_akcipher_request(jrp->engine, req, ecode);
187}
188
189
190
191
192
193
194
195
196
197static int caam_rsa_count_leading_zeros(struct scatterlist *sgl,
198 unsigned int nbytes,
199 unsigned int flags)
200{
201 struct sg_mapping_iter miter;
202 int lzeros, ents;
203 unsigned int len;
204 unsigned int tbytes = nbytes;
205 const u8 *buff;
206
207 ents = sg_nents_for_len(sgl, nbytes);
208 if (ents < 0)
209 return ents;
210
211 sg_miter_start(&miter, sgl, ents, SG_MITER_FROM_SG | flags);
212
213 lzeros = 0;
214 len = 0;
215 while (nbytes > 0) {
216
217 while (len && !*buff && lzeros < nbytes) {
218 lzeros++;
219 len--;
220 buff++;
221 }
222
223 if (len && *buff)
224 break;
225
226 sg_miter_next(&miter);
227 buff = miter.addr;
228 len = miter.length;
229
230 nbytes -= lzeros;
231 lzeros = 0;
232 }
233
234 miter.consumed = lzeros;
235 sg_miter_stop(&miter);
236 nbytes -= lzeros;
237
238 return tbytes - nbytes;
239}
240
241static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req,
242 size_t desclen)
243{
244 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
245 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
246 struct device *dev = ctx->dev;
247 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
248 struct caam_rsa_key *key = &ctx->key;
249 struct rsa_edesc *edesc;
250 gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
251 GFP_KERNEL : GFP_ATOMIC;
252 int sg_flags = (flags == GFP_ATOMIC) ? SG_MITER_ATOMIC : 0;
253 int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes;
254 int src_nents, dst_nents;
255 int mapped_src_nents, mapped_dst_nents;
256 unsigned int diff_size = 0;
257 int lzeros;
258
259 if (req->src_len > key->n_sz) {
260
261
262
263
264 lzeros = caam_rsa_count_leading_zeros(req->src, req->src_len -
265 key->n_sz, sg_flags);
266 if (lzeros < 0)
267 return ERR_PTR(lzeros);
268
269 req_ctx->fixup_src = scatterwalk_ffwd(req_ctx->src, req->src,
270 lzeros);
271 req_ctx->fixup_src_len = req->src_len - lzeros;
272 } else {
273
274
275
276
277 diff_size = key->n_sz - req->src_len;
278 req_ctx->fixup_src = req->src;
279 req_ctx->fixup_src_len = req->src_len;
280 }
281
282 src_nents = sg_nents_for_len(req_ctx->fixup_src,
283 req_ctx->fixup_src_len);
284 dst_nents = sg_nents_for_len(req->dst, req->dst_len);
285
286 mapped_src_nents = dma_map_sg(dev, req_ctx->fixup_src, src_nents,
287 DMA_TO_DEVICE);
288 if (unlikely(!mapped_src_nents)) {
289 dev_err(dev, "unable to map source\n");
290 return ERR_PTR(-ENOMEM);
291 }
292 mapped_dst_nents = dma_map_sg(dev, req->dst, dst_nents,
293 DMA_FROM_DEVICE);
294 if (unlikely(!mapped_dst_nents)) {
295 dev_err(dev, "unable to map destination\n");
296 goto src_fail;
297 }
298
299 if (!diff_size && mapped_src_nents == 1)
300 sec4_sg_len = 0;
301 else
302 sec4_sg_len = mapped_src_nents + !!diff_size;
303 sec4_sg_index = sec4_sg_len;
304
305 if (mapped_dst_nents > 1)
306 sec4_sg_len += pad_sg_nents(mapped_dst_nents);
307 else
308 sec4_sg_len = pad_sg_nents(sec4_sg_len);
309
310 sec4_sg_bytes = sec4_sg_len * sizeof(struct sec4_sg_entry);
311
312
313 edesc = kzalloc(sizeof(*edesc) + desclen + sec4_sg_bytes,
314 GFP_DMA | flags);
315 if (!edesc)
316 goto dst_fail;
317
318 edesc->sec4_sg = (void *)edesc + sizeof(*edesc) + desclen;
319 if (diff_size)
320 dma_to_sec4_sg_one(edesc->sec4_sg, ctx->padding_dma, diff_size,
321 0);
322
323 if (sec4_sg_index)
324 sg_to_sec4_sg_last(req_ctx->fixup_src, req_ctx->fixup_src_len,
325 edesc->sec4_sg + !!diff_size, 0);
326
327 if (mapped_dst_nents > 1)
328 sg_to_sec4_sg_last(req->dst, req->dst_len,
329 edesc->sec4_sg + sec4_sg_index, 0);
330
331
332 edesc->src_nents = src_nents;
333 edesc->dst_nents = dst_nents;
334
335 req_ctx->edesc = edesc;
336
337 if (!sec4_sg_bytes)
338 return edesc;
339
340 edesc->mapped_src_nents = mapped_src_nents;
341 edesc->mapped_dst_nents = mapped_dst_nents;
342
343 edesc->sec4_sg_dma = dma_map_single(dev, edesc->sec4_sg,
344 sec4_sg_bytes, DMA_TO_DEVICE);
345 if (dma_mapping_error(dev, edesc->sec4_sg_dma)) {
346 dev_err(dev, "unable to map S/G table\n");
347 goto sec4_sg_fail;
348 }
349
350 edesc->sec4_sg_bytes = sec4_sg_bytes;
351
352 print_hex_dump_debug("caampkc sec4_sg@" __stringify(__LINE__) ": ",
353 DUMP_PREFIX_ADDRESS, 16, 4, edesc->sec4_sg,
354 edesc->sec4_sg_bytes, 1);
355
356 return edesc;
357
358sec4_sg_fail:
359 kfree(edesc);
360dst_fail:
361 dma_unmap_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE);
362src_fail:
363 dma_unmap_sg(dev, req_ctx->fixup_src, src_nents, DMA_TO_DEVICE);
364 return ERR_PTR(-ENOMEM);
365}
366
367static int akcipher_do_one_req(struct crypto_engine *engine, void *areq)
368{
369 struct akcipher_request *req = container_of(areq,
370 struct akcipher_request,
371 base);
372 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
373 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
374 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
375 struct device *jrdev = ctx->dev;
376 u32 *desc = req_ctx->edesc->hw_desc;
377 int ret;
378
379 req_ctx->edesc->bklog = true;
380
381 ret = caam_jr_enqueue(jrdev, desc, req_ctx->akcipher_op_done, req);
382
383 if (ret != -EINPROGRESS) {
384 rsa_pub_unmap(jrdev, req_ctx->edesc, req);
385 rsa_io_unmap(jrdev, req_ctx->edesc, req);
386 kfree(req_ctx->edesc);
387 } else {
388 ret = 0;
389 }
390
391 return ret;
392}
393
394static int set_rsa_pub_pdb(struct akcipher_request *req,
395 struct rsa_edesc *edesc)
396{
397 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
398 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
399 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
400 struct caam_rsa_key *key = &ctx->key;
401 struct device *dev = ctx->dev;
402 struct rsa_pub_pdb *pdb = &edesc->pdb.pub;
403 int sec4_sg_index = 0;
404
405 pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE);
406 if (dma_mapping_error(dev, pdb->n_dma)) {
407 dev_err(dev, "Unable to map RSA modulus memory\n");
408 return -ENOMEM;
409 }
410
411 pdb->e_dma = dma_map_single(dev, key->e, key->e_sz, DMA_TO_DEVICE);
412 if (dma_mapping_error(dev, pdb->e_dma)) {
413 dev_err(dev, "Unable to map RSA public exponent memory\n");
414 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
415 return -ENOMEM;
416 }
417
418 if (edesc->mapped_src_nents > 1) {
419 pdb->sgf |= RSA_PDB_SGF_F;
420 pdb->f_dma = edesc->sec4_sg_dma;
421 sec4_sg_index += edesc->mapped_src_nents;
422 } else {
423 pdb->f_dma = sg_dma_address(req_ctx->fixup_src);
424 }
425
426 if (edesc->mapped_dst_nents > 1) {
427 pdb->sgf |= RSA_PDB_SGF_G;
428 pdb->g_dma = edesc->sec4_sg_dma +
429 sec4_sg_index * sizeof(struct sec4_sg_entry);
430 } else {
431 pdb->g_dma = sg_dma_address(req->dst);
432 }
433
434 pdb->sgf |= (key->e_sz << RSA_PDB_E_SHIFT) | key->n_sz;
435 pdb->f_len = req_ctx->fixup_src_len;
436
437 return 0;
438}
439
440static int set_rsa_priv_f1_pdb(struct akcipher_request *req,
441 struct rsa_edesc *edesc)
442{
443 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
444 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
445 struct caam_rsa_key *key = &ctx->key;
446 struct device *dev = ctx->dev;
447 struct rsa_priv_f1_pdb *pdb = &edesc->pdb.priv_f1;
448 int sec4_sg_index = 0;
449
450 pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE);
451 if (dma_mapping_error(dev, pdb->n_dma)) {
452 dev_err(dev, "Unable to map modulus memory\n");
453 return -ENOMEM;
454 }
455
456 pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE);
457 if (dma_mapping_error(dev, pdb->d_dma)) {
458 dev_err(dev, "Unable to map RSA private exponent memory\n");
459 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
460 return -ENOMEM;
461 }
462
463 if (edesc->mapped_src_nents > 1) {
464 pdb->sgf |= RSA_PRIV_PDB_SGF_G;
465 pdb->g_dma = edesc->sec4_sg_dma;
466 sec4_sg_index += edesc->mapped_src_nents;
467
468 } else {
469 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
470
471 pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
472 }
473
474 if (edesc->mapped_dst_nents > 1) {
475 pdb->sgf |= RSA_PRIV_PDB_SGF_F;
476 pdb->f_dma = edesc->sec4_sg_dma +
477 sec4_sg_index * sizeof(struct sec4_sg_entry);
478 } else {
479 pdb->f_dma = sg_dma_address(req->dst);
480 }
481
482 pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz;
483
484 return 0;
485}
486
487static int set_rsa_priv_f2_pdb(struct akcipher_request *req,
488 struct rsa_edesc *edesc)
489{
490 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
491 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
492 struct caam_rsa_key *key = &ctx->key;
493 struct device *dev = ctx->dev;
494 struct rsa_priv_f2_pdb *pdb = &edesc->pdb.priv_f2;
495 int sec4_sg_index = 0;
496 size_t p_sz = key->p_sz;
497 size_t q_sz = key->q_sz;
498
499 pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE);
500 if (dma_mapping_error(dev, pdb->d_dma)) {
501 dev_err(dev, "Unable to map RSA private exponent memory\n");
502 return -ENOMEM;
503 }
504
505 pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE);
506 if (dma_mapping_error(dev, pdb->p_dma)) {
507 dev_err(dev, "Unable to map RSA prime factor p memory\n");
508 goto unmap_d;
509 }
510
511 pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE);
512 if (dma_mapping_error(dev, pdb->q_dma)) {
513 dev_err(dev, "Unable to map RSA prime factor q memory\n");
514 goto unmap_p;
515 }
516
517 pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL);
518 if (dma_mapping_error(dev, pdb->tmp1_dma)) {
519 dev_err(dev, "Unable to map RSA tmp1 memory\n");
520 goto unmap_q;
521 }
522
523 pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL);
524 if (dma_mapping_error(dev, pdb->tmp2_dma)) {
525 dev_err(dev, "Unable to map RSA tmp2 memory\n");
526 goto unmap_tmp1;
527 }
528
529 if (edesc->mapped_src_nents > 1) {
530 pdb->sgf |= RSA_PRIV_PDB_SGF_G;
531 pdb->g_dma = edesc->sec4_sg_dma;
532 sec4_sg_index += edesc->mapped_src_nents;
533 } else {
534 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
535
536 pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
537 }
538
539 if (edesc->mapped_dst_nents > 1) {
540 pdb->sgf |= RSA_PRIV_PDB_SGF_F;
541 pdb->f_dma = edesc->sec4_sg_dma +
542 sec4_sg_index * sizeof(struct sec4_sg_entry);
543 } else {
544 pdb->f_dma = sg_dma_address(req->dst);
545 }
546
547 pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz;
548 pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz;
549
550 return 0;
551
552unmap_tmp1:
553 dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
554unmap_q:
555 dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
556unmap_p:
557 dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
558unmap_d:
559 dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
560
561 return -ENOMEM;
562}
563
564static int set_rsa_priv_f3_pdb(struct akcipher_request *req,
565 struct rsa_edesc *edesc)
566{
567 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
568 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
569 struct caam_rsa_key *key = &ctx->key;
570 struct device *dev = ctx->dev;
571 struct rsa_priv_f3_pdb *pdb = &edesc->pdb.priv_f3;
572 int sec4_sg_index = 0;
573 size_t p_sz = key->p_sz;
574 size_t q_sz = key->q_sz;
575
576 pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE);
577 if (dma_mapping_error(dev, pdb->p_dma)) {
578 dev_err(dev, "Unable to map RSA prime factor p memory\n");
579 return -ENOMEM;
580 }
581
582 pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE);
583 if (dma_mapping_error(dev, pdb->q_dma)) {
584 dev_err(dev, "Unable to map RSA prime factor q memory\n");
585 goto unmap_p;
586 }
587
588 pdb->dp_dma = dma_map_single(dev, key->dp, p_sz, DMA_TO_DEVICE);
589 if (dma_mapping_error(dev, pdb->dp_dma)) {
590 dev_err(dev, "Unable to map RSA exponent dp memory\n");
591 goto unmap_q;
592 }
593
594 pdb->dq_dma = dma_map_single(dev, key->dq, q_sz, DMA_TO_DEVICE);
595 if (dma_mapping_error(dev, pdb->dq_dma)) {
596 dev_err(dev, "Unable to map RSA exponent dq memory\n");
597 goto unmap_dp;
598 }
599
600 pdb->c_dma = dma_map_single(dev, key->qinv, p_sz, DMA_TO_DEVICE);
601 if (dma_mapping_error(dev, pdb->c_dma)) {
602 dev_err(dev, "Unable to map RSA CRT coefficient qinv memory\n");
603 goto unmap_dq;
604 }
605
606 pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL);
607 if (dma_mapping_error(dev, pdb->tmp1_dma)) {
608 dev_err(dev, "Unable to map RSA tmp1 memory\n");
609 goto unmap_qinv;
610 }
611
612 pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL);
613 if (dma_mapping_error(dev, pdb->tmp2_dma)) {
614 dev_err(dev, "Unable to map RSA tmp2 memory\n");
615 goto unmap_tmp1;
616 }
617
618 if (edesc->mapped_src_nents > 1) {
619 pdb->sgf |= RSA_PRIV_PDB_SGF_G;
620 pdb->g_dma = edesc->sec4_sg_dma;
621 sec4_sg_index += edesc->mapped_src_nents;
622 } else {
623 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
624
625 pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
626 }
627
628 if (edesc->mapped_dst_nents > 1) {
629 pdb->sgf |= RSA_PRIV_PDB_SGF_F;
630 pdb->f_dma = edesc->sec4_sg_dma +
631 sec4_sg_index * sizeof(struct sec4_sg_entry);
632 } else {
633 pdb->f_dma = sg_dma_address(req->dst);
634 }
635
636 pdb->sgf |= key->n_sz;
637 pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz;
638
639 return 0;
640
641unmap_tmp1:
642 dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
643unmap_qinv:
644 dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE);
645unmap_dq:
646 dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE);
647unmap_dp:
648 dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE);
649unmap_q:
650 dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
651unmap_p:
652 dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
653
654 return -ENOMEM;
655}
656
657static int akcipher_enqueue_req(struct device *jrdev,
658 void (*cbk)(struct device *jrdev, u32 *desc,
659 u32 err, void *context),
660 struct akcipher_request *req)
661{
662 struct caam_drv_private_jr *jrpriv = dev_get_drvdata(jrdev);
663 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
664 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
665 struct caam_rsa_key *key = &ctx->key;
666 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
667 struct rsa_edesc *edesc = req_ctx->edesc;
668 u32 *desc = edesc->hw_desc;
669 int ret;
670
671 req_ctx->akcipher_op_done = cbk;
672
673
674
675
676
677 if (req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)
678 ret = crypto_transfer_akcipher_request_to_engine(jrpriv->engine,
679 req);
680 else
681 ret = caam_jr_enqueue(jrdev, desc, cbk, req);
682
683 if ((ret != -EINPROGRESS) && (ret != -EBUSY)) {
684 switch (key->priv_form) {
685 case FORM1:
686 rsa_priv_f1_unmap(jrdev, edesc, req);
687 break;
688 case FORM2:
689 rsa_priv_f2_unmap(jrdev, edesc, req);
690 break;
691 case FORM3:
692 rsa_priv_f3_unmap(jrdev, edesc, req);
693 break;
694 default:
695 rsa_pub_unmap(jrdev, edesc, req);
696 }
697 rsa_io_unmap(jrdev, edesc, req);
698 kfree(edesc);
699 }
700
701 return ret;
702}
703
704static int caam_rsa_enc(struct akcipher_request *req)
705{
706 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
707 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
708 struct caam_rsa_key *key = &ctx->key;
709 struct device *jrdev = ctx->dev;
710 struct rsa_edesc *edesc;
711 int ret;
712
713 if (unlikely(!key->n || !key->e))
714 return -EINVAL;
715
716 if (req->dst_len < key->n_sz) {
717 req->dst_len = key->n_sz;
718 dev_err(jrdev, "Output buffer length less than parameter n\n");
719 return -EOVERFLOW;
720 }
721
722
723 edesc = rsa_edesc_alloc(req, DESC_RSA_PUB_LEN);
724 if (IS_ERR(edesc))
725 return PTR_ERR(edesc);
726
727
728 ret = set_rsa_pub_pdb(req, edesc);
729 if (ret)
730 goto init_fail;
731
732
733 init_rsa_pub_desc(edesc->hw_desc, &edesc->pdb.pub);
734
735 return akcipher_enqueue_req(jrdev, rsa_pub_done, req);
736
737init_fail:
738 rsa_io_unmap(jrdev, edesc, req);
739 kfree(edesc);
740 return ret;
741}
742
743static int caam_rsa_dec_priv_f1(struct akcipher_request *req)
744{
745 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
746 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
747 struct device *jrdev = ctx->dev;
748 struct rsa_edesc *edesc;
749 int ret;
750
751
752 edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F1_LEN);
753 if (IS_ERR(edesc))
754 return PTR_ERR(edesc);
755
756
757 ret = set_rsa_priv_f1_pdb(req, edesc);
758 if (ret)
759 goto init_fail;
760
761
762 init_rsa_priv_f1_desc(edesc->hw_desc, &edesc->pdb.priv_f1);
763
764 return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req);
765
766init_fail:
767 rsa_io_unmap(jrdev, edesc, req);
768 kfree(edesc);
769 return ret;
770}
771
772static int caam_rsa_dec_priv_f2(struct akcipher_request *req)
773{
774 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
775 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
776 struct device *jrdev = ctx->dev;
777 struct rsa_edesc *edesc;
778 int ret;
779
780
781 edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F2_LEN);
782 if (IS_ERR(edesc))
783 return PTR_ERR(edesc);
784
785
786 ret = set_rsa_priv_f2_pdb(req, edesc);
787 if (ret)
788 goto init_fail;
789
790
791 init_rsa_priv_f2_desc(edesc->hw_desc, &edesc->pdb.priv_f2);
792
793 return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req);
794
795init_fail:
796 rsa_io_unmap(jrdev, edesc, req);
797 kfree(edesc);
798 return ret;
799}
800
801static int caam_rsa_dec_priv_f3(struct akcipher_request *req)
802{
803 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
804 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
805 struct device *jrdev = ctx->dev;
806 struct rsa_edesc *edesc;
807 int ret;
808
809
810 edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F3_LEN);
811 if (IS_ERR(edesc))
812 return PTR_ERR(edesc);
813
814
815 ret = set_rsa_priv_f3_pdb(req, edesc);
816 if (ret)
817 goto init_fail;
818
819
820 init_rsa_priv_f3_desc(edesc->hw_desc, &edesc->pdb.priv_f3);
821
822 return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req);
823
824init_fail:
825 rsa_io_unmap(jrdev, edesc, req);
826 kfree(edesc);
827 return ret;
828}
829
830static int caam_rsa_dec(struct akcipher_request *req)
831{
832 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
833 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
834 struct caam_rsa_key *key = &ctx->key;
835 int ret;
836
837 if (unlikely(!key->n || !key->d))
838 return -EINVAL;
839
840 if (req->dst_len < key->n_sz) {
841 req->dst_len = key->n_sz;
842 dev_err(ctx->dev, "Output buffer length less than parameter n\n");
843 return -EOVERFLOW;
844 }
845
846 if (key->priv_form == FORM3)
847 ret = caam_rsa_dec_priv_f3(req);
848 else if (key->priv_form == FORM2)
849 ret = caam_rsa_dec_priv_f2(req);
850 else
851 ret = caam_rsa_dec_priv_f1(req);
852
853 return ret;
854}
855
856static void caam_rsa_free_key(struct caam_rsa_key *key)
857{
858 kfree_sensitive(key->d);
859 kfree_sensitive(key->p);
860 kfree_sensitive(key->q);
861 kfree_sensitive(key->dp);
862 kfree_sensitive(key->dq);
863 kfree_sensitive(key->qinv);
864 kfree_sensitive(key->tmp1);
865 kfree_sensitive(key->tmp2);
866 kfree(key->e);
867 kfree(key->n);
868 memset(key, 0, sizeof(*key));
869}
870
871static void caam_rsa_drop_leading_zeros(const u8 **ptr, size_t *nbytes)
872{
873 while (!**ptr && *nbytes) {
874 (*ptr)++;
875 (*nbytes)--;
876 }
877}
878
879
880
881
882
883
884
885
886
887
888
889
890static u8 *caam_read_rsa_crt(const u8 *ptr, size_t nbytes, size_t dstlen)
891{
892 u8 *dst;
893
894 caam_rsa_drop_leading_zeros(&ptr, &nbytes);
895 if (!nbytes)
896 return NULL;
897
898 dst = kzalloc(dstlen, GFP_DMA | GFP_KERNEL);
899 if (!dst)
900 return NULL;
901
902 memcpy(dst + (dstlen - nbytes), ptr, nbytes);
903
904 return dst;
905}
906
907
908
909
910
911
912
913
914
915
916static inline u8 *caam_read_raw_data(const u8 *buf, size_t *nbytes)
917{
918
919 caam_rsa_drop_leading_zeros(&buf, nbytes);
920 if (!*nbytes)
921 return NULL;
922
923 return kmemdup(buf, *nbytes, GFP_DMA | GFP_KERNEL);
924}
925
926static int caam_rsa_check_key_length(unsigned int len)
927{
928 if (len > 4096)
929 return -EINVAL;
930 return 0;
931}
932
933static int caam_rsa_set_pub_key(struct crypto_akcipher *tfm, const void *key,
934 unsigned int keylen)
935{
936 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
937 struct rsa_key raw_key = {NULL};
938 struct caam_rsa_key *rsa_key = &ctx->key;
939 int ret;
940
941
942 caam_rsa_free_key(rsa_key);
943
944 ret = rsa_parse_pub_key(&raw_key, key, keylen);
945 if (ret)
946 return ret;
947
948
949 rsa_key->e = kmemdup(raw_key.e, raw_key.e_sz, GFP_DMA | GFP_KERNEL);
950 if (!rsa_key->e)
951 goto err;
952
953
954
955
956
957
958
959 rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz);
960 if (!rsa_key->n)
961 goto err;
962
963 if (caam_rsa_check_key_length(raw_key.n_sz << 3)) {
964 caam_rsa_free_key(rsa_key);
965 return -EINVAL;
966 }
967
968 rsa_key->e_sz = raw_key.e_sz;
969 rsa_key->n_sz = raw_key.n_sz;
970
971 return 0;
972err:
973 caam_rsa_free_key(rsa_key);
974 return -ENOMEM;
975}
976
977static void caam_rsa_set_priv_key_form(struct caam_rsa_ctx *ctx,
978 struct rsa_key *raw_key)
979{
980 struct caam_rsa_key *rsa_key = &ctx->key;
981 size_t p_sz = raw_key->p_sz;
982 size_t q_sz = raw_key->q_sz;
983
984 rsa_key->p = caam_read_raw_data(raw_key->p, &p_sz);
985 if (!rsa_key->p)
986 return;
987 rsa_key->p_sz = p_sz;
988
989 rsa_key->q = caam_read_raw_data(raw_key->q, &q_sz);
990 if (!rsa_key->q)
991 goto free_p;
992 rsa_key->q_sz = q_sz;
993
994 rsa_key->tmp1 = kzalloc(raw_key->p_sz, GFP_DMA | GFP_KERNEL);
995 if (!rsa_key->tmp1)
996 goto free_q;
997
998 rsa_key->tmp2 = kzalloc(raw_key->q_sz, GFP_DMA | GFP_KERNEL);
999 if (!rsa_key->tmp2)
1000 goto free_tmp1;
1001
1002 rsa_key->priv_form = FORM2;
1003
1004 rsa_key->dp = caam_read_rsa_crt(raw_key->dp, raw_key->dp_sz, p_sz);
1005 if (!rsa_key->dp)
1006 goto free_tmp2;
1007
1008 rsa_key->dq = caam_read_rsa_crt(raw_key->dq, raw_key->dq_sz, q_sz);
1009 if (!rsa_key->dq)
1010 goto free_dp;
1011
1012 rsa_key->qinv = caam_read_rsa_crt(raw_key->qinv, raw_key->qinv_sz,
1013 q_sz);
1014 if (!rsa_key->qinv)
1015 goto free_dq;
1016
1017 rsa_key->priv_form = FORM3;
1018
1019 return;
1020
1021free_dq:
1022 kfree_sensitive(rsa_key->dq);
1023free_dp:
1024 kfree_sensitive(rsa_key->dp);
1025free_tmp2:
1026 kfree_sensitive(rsa_key->tmp2);
1027free_tmp1:
1028 kfree_sensitive(rsa_key->tmp1);
1029free_q:
1030 kfree_sensitive(rsa_key->q);
1031free_p:
1032 kfree_sensitive(rsa_key->p);
1033}
1034
1035static int caam_rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key,
1036 unsigned int keylen)
1037{
1038 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
1039 struct rsa_key raw_key = {NULL};
1040 struct caam_rsa_key *rsa_key = &ctx->key;
1041 int ret;
1042
1043
1044 caam_rsa_free_key(rsa_key);
1045
1046 ret = rsa_parse_priv_key(&raw_key, key, keylen);
1047 if (ret)
1048 return ret;
1049
1050
1051 rsa_key->d = kmemdup(raw_key.d, raw_key.d_sz, GFP_DMA | GFP_KERNEL);
1052 if (!rsa_key->d)
1053 goto err;
1054
1055 rsa_key->e = kmemdup(raw_key.e, raw_key.e_sz, GFP_DMA | GFP_KERNEL);
1056 if (!rsa_key->e)
1057 goto err;
1058
1059
1060
1061
1062
1063
1064
1065 rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz);
1066 if (!rsa_key->n)
1067 goto err;
1068
1069 if (caam_rsa_check_key_length(raw_key.n_sz << 3)) {
1070 caam_rsa_free_key(rsa_key);
1071 return -EINVAL;
1072 }
1073
1074 rsa_key->d_sz = raw_key.d_sz;
1075 rsa_key->e_sz = raw_key.e_sz;
1076 rsa_key->n_sz = raw_key.n_sz;
1077
1078 caam_rsa_set_priv_key_form(ctx, &raw_key);
1079
1080 return 0;
1081
1082err:
1083 caam_rsa_free_key(rsa_key);
1084 return -ENOMEM;
1085}
1086
1087static unsigned int caam_rsa_max_size(struct crypto_akcipher *tfm)
1088{
1089 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
1090
1091 return ctx->key.n_sz;
1092}
1093
1094
1095static int caam_rsa_init_tfm(struct crypto_akcipher *tfm)
1096{
1097 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
1098
1099 ctx->dev = caam_jr_alloc();
1100
1101 if (IS_ERR(ctx->dev)) {
1102 pr_err("Job Ring Device allocation for transform failed\n");
1103 return PTR_ERR(ctx->dev);
1104 }
1105
1106 ctx->padding_dma = dma_map_single(ctx->dev, zero_buffer,
1107 CAAM_RSA_MAX_INPUT_SIZE - 1,
1108 DMA_TO_DEVICE);
1109 if (dma_mapping_error(ctx->dev, ctx->padding_dma)) {
1110 dev_err(ctx->dev, "unable to map padding\n");
1111 caam_jr_free(ctx->dev);
1112 return -ENOMEM;
1113 }
1114
1115 ctx->enginectx.op.do_one_request = akcipher_do_one_req;
1116
1117 return 0;
1118}
1119
1120
1121static void caam_rsa_exit_tfm(struct crypto_akcipher *tfm)
1122{
1123 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
1124 struct caam_rsa_key *key = &ctx->key;
1125
1126 dma_unmap_single(ctx->dev, ctx->padding_dma, CAAM_RSA_MAX_INPUT_SIZE -
1127 1, DMA_TO_DEVICE);
1128 caam_rsa_free_key(key);
1129 caam_jr_free(ctx->dev);
1130}
1131
1132static struct caam_akcipher_alg caam_rsa = {
1133 .akcipher = {
1134 .encrypt = caam_rsa_enc,
1135 .decrypt = caam_rsa_dec,
1136 .set_pub_key = caam_rsa_set_pub_key,
1137 .set_priv_key = caam_rsa_set_priv_key,
1138 .max_size = caam_rsa_max_size,
1139 .init = caam_rsa_init_tfm,
1140 .exit = caam_rsa_exit_tfm,
1141 .reqsize = sizeof(struct caam_rsa_req_ctx),
1142 .base = {
1143 .cra_name = "rsa",
1144 .cra_driver_name = "rsa-caam",
1145 .cra_priority = 3000,
1146 .cra_module = THIS_MODULE,
1147 .cra_ctxsize = sizeof(struct caam_rsa_ctx),
1148 },
1149 }
1150};
1151
1152
1153int caam_pkc_init(struct device *ctrldev)
1154{
1155 struct caam_drv_private *priv = dev_get_drvdata(ctrldev);
1156 u32 pk_inst;
1157 int err;
1158 init_done = false;
1159
1160
1161 if (priv->era < 10)
1162 pk_inst = (rd_reg32(&priv->ctrl->perfmon.cha_num_ls) &
1163 CHA_ID_LS_PK_MASK) >> CHA_ID_LS_PK_SHIFT;
1164 else
1165 pk_inst = rd_reg32(&priv->ctrl->vreg.pkha) & CHA_VER_NUM_MASK;
1166
1167
1168 if (!pk_inst)
1169 return 0;
1170
1171
1172 zero_buffer = kzalloc(CAAM_RSA_MAX_INPUT_SIZE - 1, GFP_DMA |
1173 GFP_KERNEL);
1174 if (!zero_buffer)
1175 return -ENOMEM;
1176
1177 err = crypto_register_akcipher(&caam_rsa.akcipher);
1178
1179 if (err) {
1180 kfree(zero_buffer);
1181 dev_warn(ctrldev, "%s alg registration failed\n",
1182 caam_rsa.akcipher.base.cra_driver_name);
1183 } else {
1184 init_done = true;
1185 caam_rsa.registered = true;
1186 dev_info(ctrldev, "caam pkc algorithms registered in /proc/crypto\n");
1187 }
1188
1189 return err;
1190}
1191
1192void caam_pkc_exit(void)
1193{
1194 if (!init_done)
1195 return;
1196
1197 if (caam_rsa.registered)
1198 crypto_unregister_akcipher(&caam_rsa.akcipher);
1199
1200 kfree(zero_buffer);
1201}
1202