1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
3 * caam - Freescale FSL CAAM support for Public Key Cryptography
5 * Copyright 2016 Freescale Semiconductor, Inc.
6 * Copyright 2018-2019 NXP
8 * There is no Shared Descriptor for PKC so that the Job Descriptor must carry
9 * all the desired key parameters, input and output pointers.
16 #include "desc_constr.h"
17 #include "sg_sw_sec4.h"
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 /* for a 4096-bit modulus */
29 /* buffer filled with zeros, used for padding */
30 static u8 *zero_buffer;
33 * variable used to avoid double free of resources in case
34 * algorithm registration was unsuccessful
36 static bool init_done;
38 struct caam_akcipher_alg {
39 struct akcipher_alg akcipher;
43 static void rsa_io_unmap(struct device *dev, struct rsa_edesc *edesc,
44 struct akcipher_request *req)
46 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
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);
51 if (edesc->sec4_sg_bytes)
52 dma_unmap_single(dev, edesc->sec4_sg_dma, edesc->sec4_sg_bytes,
56 static void rsa_pub_unmap(struct device *dev, struct rsa_edesc *edesc,
57 struct akcipher_request *req)
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;
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);
68 static void rsa_priv_f1_unmap(struct device *dev, struct rsa_edesc *edesc,
69 struct akcipher_request *req)
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;
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);
80 static void rsa_priv_f2_unmap(struct device *dev, struct rsa_edesc *edesc,
81 struct akcipher_request *req)
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;
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);
97 static void rsa_priv_f3_unmap(struct device *dev, struct rsa_edesc *edesc,
98 struct akcipher_request *req)
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;
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);
116 /* RSA Job Completion handler */
117 static void rsa_pub_done(struct device *dev, u32 *desc, u32 err, void *context)
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;
127 ecode = caam_jr_strstatus(dev, err);
129 edesc = req_ctx->edesc;
130 has_bklog = edesc->bklog;
132 rsa_pub_unmap(dev, edesc, req);
133 rsa_io_unmap(dev, edesc, req);
137 * If no backlog flag, the completion of the request is done
138 * by CAAM, not crypto engine.
141 akcipher_request_complete(req, ecode);
143 crypto_finalize_akcipher_request(jrp->engine, req, ecode);
146 static void rsa_priv_f_done(struct device *dev, u32 *desc, u32 err,
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;
160 ecode = caam_jr_strstatus(dev, err);
162 edesc = req_ctx->edesc;
163 has_bklog = edesc->bklog;
165 switch (key->priv_form) {
167 rsa_priv_f1_unmap(dev, edesc, req);
170 rsa_priv_f2_unmap(dev, edesc, req);
173 rsa_priv_f3_unmap(dev, edesc, req);
176 rsa_io_unmap(dev, edesc, req);
180 * If no backlog flag, the completion of the request is done
181 * by CAAM, not crypto engine.
184 akcipher_request_complete(req, ecode);
186 crypto_finalize_akcipher_request(jrp->engine, req, ecode);
190 * caam_rsa_count_leading_zeros - Count leading zeros, need it to strip,
191 * from a given scatterlist
193 * @sgl : scatterlist to count zeros from
194 * @nbytes: number of zeros, in bytes, to strip
195 * @flags : operation flags
197 static int caam_rsa_count_leading_zeros(struct scatterlist *sgl,
201 struct sg_mapping_iter miter;
204 unsigned int tbytes = nbytes;
207 ents = sg_nents_for_len(sgl, nbytes);
211 sg_miter_start(&miter, sgl, ents, SG_MITER_FROM_SG | flags);
216 /* do not strip more than given bytes */
217 while (len && !*buff && lzeros < nbytes) {
226 sg_miter_next(&miter);
234 miter.consumed = lzeros;
235 sg_miter_stop(&miter);
238 return tbytes - nbytes;
241 static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req,
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;
259 if (req->src_len > key->n_sz) {
261 * strip leading zeros and
262 * return the number of zeros to skip
264 lzeros = caam_rsa_count_leading_zeros(req->src, req->src_len -
265 key->n_sz, sg_flags);
267 return ERR_PTR(lzeros);
269 req_ctx->fixup_src = scatterwalk_ffwd(req_ctx->src, req->src,
271 req_ctx->fixup_src_len = req->src_len - lzeros;
274 * input src is less then n key modulus,
275 * so there will be zero padding
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;
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);
286 mapped_src_nents = dma_map_sg(dev, req_ctx->fixup_src, src_nents,
288 if (unlikely(!mapped_src_nents)) {
289 dev_err(dev, "unable to map source\n");
290 return ERR_PTR(-ENOMEM);
292 mapped_dst_nents = dma_map_sg(dev, req->dst, dst_nents,
294 if (unlikely(!mapped_dst_nents)) {
295 dev_err(dev, "unable to map destination\n");
299 if (!diff_size && mapped_src_nents == 1)
300 sec4_sg_len = 0; /* no need for an input hw s/g table */
302 sec4_sg_len = mapped_src_nents + !!diff_size;
303 sec4_sg_index = sec4_sg_len;
305 if (mapped_dst_nents > 1)
306 sec4_sg_len += pad_sg_nents(mapped_dst_nents);
308 sec4_sg_len = pad_sg_nents(sec4_sg_len);
310 sec4_sg_bytes = sec4_sg_len * sizeof(struct sec4_sg_entry);
312 /* allocate space for base edesc, hw desc commands and link tables */
313 edesc = kzalloc(sizeof(*edesc) + desclen + sec4_sg_bytes,
318 edesc->sec4_sg = (void *)edesc + sizeof(*edesc) + desclen;
320 dma_to_sec4_sg_one(edesc->sec4_sg, ctx->padding_dma, diff_size,
324 sg_to_sec4_sg_last(req_ctx->fixup_src, req_ctx->fixup_src_len,
325 edesc->sec4_sg + !!diff_size, 0);
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);
331 /* Save nents for later use in Job Descriptor */
332 edesc->src_nents = src_nents;
333 edesc->dst_nents = dst_nents;
335 req_ctx->edesc = edesc;
340 edesc->mapped_src_nents = mapped_src_nents;
341 edesc->mapped_dst_nents = mapped_dst_nents;
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");
350 edesc->sec4_sg_bytes = sec4_sg_bytes;
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);
361 dma_unmap_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE);
363 dma_unmap_sg(dev, req_ctx->fixup_src, src_nents, DMA_TO_DEVICE);
364 return ERR_PTR(-ENOMEM);
367 static int akcipher_do_one_req(struct crypto_engine *engine, void *areq)
369 struct akcipher_request *req = container_of(areq,
370 struct akcipher_request,
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;
379 req_ctx->edesc->bklog = true;
381 ret = caam_jr_enqueue(jrdev, desc, req_ctx->akcipher_op_done, req);
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);
394 static int set_rsa_pub_pdb(struct akcipher_request *req,
395 struct rsa_edesc *edesc)
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;
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");
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);
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;
423 pdb->f_dma = sg_dma_address(req_ctx->fixup_src);
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);
431 pdb->g_dma = sg_dma_address(req->dst);
434 pdb->sgf |= (key->e_sz << RSA_PDB_E_SHIFT) | key->n_sz;
435 pdb->f_len = req_ctx->fixup_src_len;
440 static int set_rsa_priv_f1_pdb(struct akcipher_request *req,
441 struct rsa_edesc *edesc)
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;
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");
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);
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;
469 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
471 pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
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);
479 pdb->f_dma = sg_dma_address(req->dst);
482 pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz;
487 static int set_rsa_priv_f2_pdb(struct akcipher_request *req,
488 struct rsa_edesc *edesc)
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;
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");
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");
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");
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");
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");
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;
534 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
536 pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
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);
544 pdb->f_dma = sg_dma_address(req->dst);
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;
553 dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
555 dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
557 dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
559 dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
564 static int set_rsa_priv_f3_pdb(struct akcipher_request *req,
565 struct rsa_edesc *edesc)
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;
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");
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");
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");
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");
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");
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");
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");
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;
623 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
625 pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
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);
633 pdb->f_dma = sg_dma_address(req->dst);
636 pdb->sgf |= key->n_sz;
637 pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz;
642 dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
644 dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE);
646 dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE);
648 dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE);
650 dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
652 dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
657 static 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)
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;
671 req_ctx->akcipher_op_done = cbk;
673 * Only the backlog request are sent to crypto-engine since the others
674 * can be handled by CAAM, if free, especially since JR has up to 1024
675 * entries (more than the 10 entries from crypto-engine).
677 if (req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)
678 ret = crypto_transfer_akcipher_request_to_engine(jrpriv->engine,
681 ret = caam_jr_enqueue(jrdev, desc, cbk, req);
683 if ((ret != -EINPROGRESS) && (ret != -EBUSY)) {
684 switch (key->priv_form) {
686 rsa_priv_f1_unmap(jrdev, edesc, req);
689 rsa_priv_f2_unmap(jrdev, edesc, req);
692 rsa_priv_f3_unmap(jrdev, edesc, req);
695 rsa_pub_unmap(jrdev, edesc, req);
697 rsa_io_unmap(jrdev, edesc, req);
704 static int caam_rsa_enc(struct akcipher_request *req)
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;
713 if (unlikely(!key->n || !key->e))
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");
722 /* Allocate extended descriptor */
723 edesc = rsa_edesc_alloc(req, DESC_RSA_PUB_LEN);
725 return PTR_ERR(edesc);
727 /* Set RSA Encrypt Protocol Data Block */
728 ret = set_rsa_pub_pdb(req, edesc);
732 /* Initialize Job Descriptor */
733 init_rsa_pub_desc(edesc->hw_desc, &edesc->pdb.pub);
735 return akcipher_enqueue_req(jrdev, rsa_pub_done, req);
738 rsa_io_unmap(jrdev, edesc, req);
743 static int caam_rsa_dec_priv_f1(struct akcipher_request *req)
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;
751 /* Allocate extended descriptor */
752 edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F1_LEN);
754 return PTR_ERR(edesc);
756 /* Set RSA Decrypt Protocol Data Block - Private Key Form #1 */
757 ret = set_rsa_priv_f1_pdb(req, edesc);
761 /* Initialize Job Descriptor */
762 init_rsa_priv_f1_desc(edesc->hw_desc, &edesc->pdb.priv_f1);
764 return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req);
767 rsa_io_unmap(jrdev, edesc, req);
772 static int caam_rsa_dec_priv_f2(struct akcipher_request *req)
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;
780 /* Allocate extended descriptor */
781 edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F2_LEN);
783 return PTR_ERR(edesc);
785 /* Set RSA Decrypt Protocol Data Block - Private Key Form #2 */
786 ret = set_rsa_priv_f2_pdb(req, edesc);
790 /* Initialize Job Descriptor */
791 init_rsa_priv_f2_desc(edesc->hw_desc, &edesc->pdb.priv_f2);
793 return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req);
796 rsa_io_unmap(jrdev, edesc, req);
801 static int caam_rsa_dec_priv_f3(struct akcipher_request *req)
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;
809 /* Allocate extended descriptor */
810 edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F3_LEN);
812 return PTR_ERR(edesc);
814 /* Set RSA Decrypt Protocol Data Block - Private Key Form #3 */
815 ret = set_rsa_priv_f3_pdb(req, edesc);
819 /* Initialize Job Descriptor */
820 init_rsa_priv_f3_desc(edesc->hw_desc, &edesc->pdb.priv_f3);
822 return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req);
825 rsa_io_unmap(jrdev, edesc, req);
830 static int caam_rsa_dec(struct akcipher_request *req)
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;
837 if (unlikely(!key->n || !key->d))
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");
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);
851 ret = caam_rsa_dec_priv_f1(req);
856 static void caam_rsa_free_key(struct caam_rsa_key *key)
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);
868 memset(key, 0, sizeof(*key));
871 static void caam_rsa_drop_leading_zeros(const u8 **ptr, size_t *nbytes)
873 while (!**ptr && *nbytes) {
880 * caam_read_rsa_crt - Used for reading dP, dQ, qInv CRT members.
881 * dP, dQ and qInv could decode to less than corresponding p, q length, as the
882 * BER-encoding requires that the minimum number of bytes be used to encode the
883 * integer. dP, dQ, qInv decoded values have to be zero-padded to appropriate
886 * @ptr : pointer to {dP, dQ, qInv} CRT member
887 * @nbytes: length in bytes of {dP, dQ, qInv} CRT member
888 * @dstlen: length in bytes of corresponding p or q prime factor
890 static u8 *caam_read_rsa_crt(const u8 *ptr, size_t nbytes, size_t dstlen)
894 caam_rsa_drop_leading_zeros(&ptr, &nbytes);
898 dst = kzalloc(dstlen, GFP_DMA | GFP_KERNEL);
902 memcpy(dst + (dstlen - nbytes), ptr, nbytes);
908 * caam_read_raw_data - Read a raw byte stream as a positive integer.
909 * The function skips buffer's leading zeros, copies the remained data
910 * to a buffer allocated in the GFP_DMA | GFP_KERNEL zone and returns
911 * the address of the new buffer.
913 * @buf : The data to read
914 * @nbytes: The amount of data to read
916 static inline u8 *caam_read_raw_data(const u8 *buf, size_t *nbytes)
919 caam_rsa_drop_leading_zeros(&buf, nbytes);
923 return kmemdup(buf, *nbytes, GFP_DMA | GFP_KERNEL);
926 static int caam_rsa_check_key_length(unsigned int len)
933 static int caam_rsa_set_pub_key(struct crypto_akcipher *tfm, const void *key,
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;
941 /* Free the old RSA key if any */
942 caam_rsa_free_key(rsa_key);
944 ret = rsa_parse_pub_key(&raw_key, key, keylen);
948 /* Copy key in DMA zone */
949 rsa_key->e = kmemdup(raw_key.e, raw_key.e_sz, GFP_DMA | GFP_KERNEL);
954 * Skip leading zeros and copy the positive integer to a buffer
955 * allocated in the GFP_DMA | GFP_KERNEL zone. The decryption descriptor
956 * expects a positive integer for the RSA modulus and uses its length as
957 * decryption output length.
959 rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz);
963 if (caam_rsa_check_key_length(raw_key.n_sz << 3)) {
964 caam_rsa_free_key(rsa_key);
968 rsa_key->e_sz = raw_key.e_sz;
969 rsa_key->n_sz = raw_key.n_sz;
973 caam_rsa_free_key(rsa_key);
977 static void caam_rsa_set_priv_key_form(struct caam_rsa_ctx *ctx,
978 struct rsa_key *raw_key)
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;
984 rsa_key->p = caam_read_raw_data(raw_key->p, &p_sz);
987 rsa_key->p_sz = p_sz;
989 rsa_key->q = caam_read_raw_data(raw_key->q, &q_sz);
992 rsa_key->q_sz = q_sz;
994 rsa_key->tmp1 = kzalloc(raw_key->p_sz, GFP_DMA | GFP_KERNEL);
998 rsa_key->tmp2 = kzalloc(raw_key->q_sz, GFP_DMA | GFP_KERNEL);
1002 rsa_key->priv_form = FORM2;
1004 rsa_key->dp = caam_read_rsa_crt(raw_key->dp, raw_key->dp_sz, p_sz);
1008 rsa_key->dq = caam_read_rsa_crt(raw_key->dq, raw_key->dq_sz, q_sz);
1012 rsa_key->qinv = caam_read_rsa_crt(raw_key->qinv, raw_key->qinv_sz,
1017 rsa_key->priv_form = FORM3;
1022 kfree_sensitive(rsa_key->dq);
1024 kfree_sensitive(rsa_key->dp);
1026 kfree_sensitive(rsa_key->tmp2);
1028 kfree_sensitive(rsa_key->tmp1);
1030 kfree_sensitive(rsa_key->q);
1032 kfree_sensitive(rsa_key->p);
1035 static int caam_rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key,
1036 unsigned int keylen)
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;
1043 /* Free the old RSA key if any */
1044 caam_rsa_free_key(rsa_key);
1046 ret = rsa_parse_priv_key(&raw_key, key, keylen);
1050 /* Copy key in DMA zone */
1051 rsa_key->d = kmemdup(raw_key.d, raw_key.d_sz, GFP_DMA | GFP_KERNEL);
1055 rsa_key->e = kmemdup(raw_key.e, raw_key.e_sz, GFP_DMA | GFP_KERNEL);
1060 * Skip leading zeros and copy the positive integer to a buffer
1061 * allocated in the GFP_DMA | GFP_KERNEL zone. The decryption descriptor
1062 * expects a positive integer for the RSA modulus and uses its length as
1063 * decryption output length.
1065 rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz);
1069 if (caam_rsa_check_key_length(raw_key.n_sz << 3)) {
1070 caam_rsa_free_key(rsa_key);
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;
1078 caam_rsa_set_priv_key_form(ctx, &raw_key);
1083 caam_rsa_free_key(rsa_key);
1087 static unsigned int caam_rsa_max_size(struct crypto_akcipher *tfm)
1089 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
1091 return ctx->key.n_sz;
1094 /* Per session pkc's driver context creation function */
1095 static int caam_rsa_init_tfm(struct crypto_akcipher *tfm)
1097 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
1099 ctx->dev = caam_jr_alloc();
1101 if (IS_ERR(ctx->dev)) {
1102 pr_err("Job Ring Device allocation for transform failed\n");
1103 return PTR_ERR(ctx->dev);
1106 ctx->padding_dma = dma_map_single(ctx->dev, zero_buffer,
1107 CAAM_RSA_MAX_INPUT_SIZE - 1,
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);
1115 ctx->enginectx.op.do_one_request = akcipher_do_one_req;
1120 /* Per session pkc's driver context cleanup function */
1121 static void caam_rsa_exit_tfm(struct crypto_akcipher *tfm)
1123 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
1124 struct caam_rsa_key *key = &ctx->key;
1126 dma_unmap_single(ctx->dev, ctx->padding_dma, CAAM_RSA_MAX_INPUT_SIZE -
1128 caam_rsa_free_key(key);
1129 caam_jr_free(ctx->dev);
1132 static struct caam_akcipher_alg caam_rsa = {
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),
1144 .cra_driver_name = "rsa-caam",
1145 .cra_priority = 3000,
1146 .cra_module = THIS_MODULE,
1147 .cra_ctxsize = sizeof(struct caam_rsa_ctx),
1152 /* Public Key Cryptography module initialization handler */
1153 int caam_pkc_init(struct device *ctrldev)
1155 struct caam_drv_private *priv = dev_get_drvdata(ctrldev);
1160 /* Determine public key hardware accelerator presence. */
1162 pk_inst = (rd_reg32(&priv->ctrl->perfmon.cha_num_ls) &
1163 CHA_ID_LS_PK_MASK) >> CHA_ID_LS_PK_SHIFT;
1165 pk_inst = rd_reg32(&priv->ctrl->vreg.pkha) & CHA_VER_NUM_MASK;
1167 /* Do not register algorithms if PKHA is not present. */
1171 /* allocate zero buffer, used for padding input */
1172 zero_buffer = kzalloc(CAAM_RSA_MAX_INPUT_SIZE - 1, GFP_DMA |
1177 err = crypto_register_akcipher(&caam_rsa.akcipher);
1181 dev_warn(ctrldev, "%s alg registration failed\n",
1182 caam_rsa.akcipher.base.cra_driver_name);
1185 caam_rsa.registered = true;
1186 dev_info(ctrldev, "caam pkc algorithms registered in /proc/crypto\n");
1192 void caam_pkc_exit(void)
1197 if (caam_rsa.registered)
1198 crypto_unregister_akcipher(&caam_rsa.akcipher);