1// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) 2/* 3 * caam - Freescale FSL CAAM support for Public Key Cryptography 4 * 5 * Copyright 2016 Freescale Semiconductor, Inc. 6 * Copyright 2018-2019 NXP 7 * 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. 10 */ 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 /* for a 4096-bit modulus */ 28 29/* buffer filled with zeros, used for padding */ 30static u8 *zero_buffer; 31 32/* 33 * variable used to avoid double free of resources in case 34 * algorithm registration was unsuccessful 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/* RSA Job Completion handler */ 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 * If no backlog flag, the completion of the request is done 138 * by CAAM, not crypto engine. 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 * If no backlog flag, the completion of the request is done 181 * by CAAM, not crypto engine. 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 * Count leading zeros, need it to strip, from a given scatterlist 191 * 192 * @sgl : scatterlist to count zeros from 193 * @nbytes: number of zeros, in bytes, to strip 194 * @flags : operation flags 195 */ 196static int caam_rsa_count_leading_zeros(struct scatterlist *sgl, 197 unsigned int nbytes, 198 unsigned int flags) 199{ 200 struct sg_mapping_iter miter; 201 int lzeros, ents; 202 unsigned int len; 203 unsigned int tbytes = nbytes; 204 const u8 *buff; 205 206 ents = sg_nents_for_len(sgl, nbytes); 207 if (ents < 0) 208 return ents; 209 210 sg_miter_start(&miter, sgl, ents, SG_MITER_FROM_SG | flags); 211 212 lzeros = 0; 213 len = 0; 214 while (nbytes > 0) { 215 /* do not strip more than given bytes */ 216 while (len && !*buff && lzeros < nbytes) { 217 lzeros++; 218 len--; 219 buff++; 220 } 221 222 if (len && *buff) 223 break; 224 225 if (!sg_miter_next(&miter)) 226 break; 227 228 buff = miter.addr; 229 len = miter.length; 230 231 nbytes -= lzeros; 232 lzeros = 0; 233 } 234 235 miter.consumed = lzeros; 236 sg_miter_stop(&miter); 237 nbytes -= lzeros; 238 239 return tbytes - nbytes; 240} 241 242static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req, 243 size_t desclen) 244{ 245 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 246 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 247 struct device *dev = ctx->dev; 248 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); 249 struct caam_rsa_key *key = &ctx->key; 250 struct rsa_edesc *edesc; 251 gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? 252 GFP_KERNEL : GFP_ATOMIC; 253 int sg_flags = (flags == GFP_ATOMIC) ? SG_MITER_ATOMIC : 0; 254 int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes; 255 int src_nents, dst_nents; 256 int mapped_src_nents, mapped_dst_nents; 257 unsigned int diff_size = 0; 258 int lzeros; 259 260 if (req->src_len > key->n_sz) { 261 /* 262 * strip leading zeros and 263 * return the number of zeros to skip 264 */ 265 lzeros = caam_rsa_count_leading_zeros(req->src, req->src_len - 266 key->n_sz, sg_flags); 267 if (lzeros < 0) 268 return ERR_PTR(lzeros); 269 270 req_ctx->fixup_src = scatterwalk_ffwd(req_ctx->src, req->src, 271 lzeros); 272 req_ctx->fixup_src_len = req->src_len - lzeros; 273 } else { 274 /* 275 * input src is less then n key modulus, 276 * so there will be zero padding 277 */ 278 diff_size = key->n_sz - req->src_len; 279 req_ctx->fixup_src = req->src; 280 req_ctx->fixup_src_len = req->src_len; 281 } 282 283 src_nents = sg_nents_for_len(req_ctx->fixup_src, 284 req_ctx->fixup_src_len); 285 dst_nents = sg_nents_for_len(req->dst, req->dst_len); 286 287 mapped_src_nents = dma_map_sg(dev, req_ctx->fixup_src, src_nents, 288 DMA_TO_DEVICE); 289 if (unlikely(!mapped_src_nents)) { 290 dev_err(dev, "unable to map source\n"); 291 return ERR_PTR(-ENOMEM); 292 } 293 mapped_dst_nents = dma_map_sg(dev, req->dst, dst_nents, 294 DMA_FROM_DEVICE); 295 if (unlikely(!mapped_dst_nents)) { 296 dev_err(dev, "unable to map destination\n"); 297 goto src_fail; 298 } 299 300 if (!diff_size && mapped_src_nents == 1) 301 sec4_sg_len = 0; /* no need for an input hw s/g table */ 302 else 303 sec4_sg_len = mapped_src_nents + !!diff_size; 304 sec4_sg_index = sec4_sg_len; 305 306 if (mapped_dst_nents > 1) 307 sec4_sg_len += pad_sg_nents(mapped_dst_nents); 308 else 309 sec4_sg_len = pad_sg_nents(sec4_sg_len); 310 311 sec4_sg_bytes = sec4_sg_len * sizeof(struct sec4_sg_entry); 312 313 /* allocate space for base edesc, hw desc commands and link tables */ 314 edesc = kzalloc(sizeof(*edesc) + desclen + sec4_sg_bytes, 315 GFP_DMA | flags); 316 if (!edesc) 317 goto dst_fail; 318 319 edesc->sec4_sg = (void *)edesc + sizeof(*edesc) + desclen; 320 if (diff_size) 321 dma_to_sec4_sg_one(edesc->sec4_sg, ctx->padding_dma, diff_size, 322 0); 323 324 if (sec4_sg_index) 325 sg_to_sec4_sg_last(req_ctx->fixup_src, req_ctx->fixup_src_len, 326 edesc->sec4_sg + !!diff_size, 0); 327 328 if (mapped_dst_nents > 1) 329 sg_to_sec4_sg_last(req->dst, req->dst_len, 330 edesc->sec4_sg + sec4_sg_index, 0); 331 332 /* Save nents for later use in Job Descriptor */ 333 edesc->src_nents = src_nents; 334 edesc->dst_nents = dst_nents; 335 336 req_ctx->edesc = edesc; 337 338 if (!sec4_sg_bytes) 339 return edesc; 340 341 edesc->mapped_src_nents = mapped_src_nents; 342 edesc->mapped_dst_nents = mapped_dst_nents; 343 344 edesc->sec4_sg_dma = dma_map_single(dev, edesc->sec4_sg, 345 sec4_sg_bytes, DMA_TO_DEVICE); 346 if (dma_mapping_error(dev, edesc->sec4_sg_dma)) { 347 dev_err(dev, "unable to map S/G table\n"); 348 goto sec4_sg_fail; 349 } 350 351 edesc->sec4_sg_bytes = sec4_sg_bytes; 352 353 print_hex_dump_debug("caampkc sec4_sg@" __stringify(__LINE__) ": ", 354 DUMP_PREFIX_ADDRESS, 16, 4, edesc->sec4_sg, 355 edesc->sec4_sg_bytes, 1); 356 357 return edesc; 358 359sec4_sg_fail: 360 kfree(edesc); 361dst_fail: 362 dma_unmap_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE); 363src_fail: 364 dma_unmap_sg(dev, req_ctx->fixup_src, src_nents, DMA_TO_DEVICE); 365 return ERR_PTR(-ENOMEM); 366} 367 368static int akcipher_do_one_req(struct crypto_engine *engine, void *areq) 369{ 370 struct akcipher_request *req = container_of(areq, 371 struct akcipher_request, 372 base); 373 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 374 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); 375 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 376 struct device *jrdev = ctx->dev; 377 u32 *desc = req_ctx->edesc->hw_desc; 378 int ret; 379 380 req_ctx->edesc->bklog = true; 381 382 ret = caam_jr_enqueue(jrdev, desc, req_ctx->akcipher_op_done, req); 383 384 if (ret != -EINPROGRESS) { 385 rsa_pub_unmap(jrdev, req_ctx->edesc, req); 386 rsa_io_unmap(jrdev, req_ctx->edesc, req); 387 kfree(req_ctx->edesc); 388 } else { 389 ret = 0; 390 } 391 392 return ret; 393} 394 395static int set_rsa_pub_pdb(struct akcipher_request *req, 396 struct rsa_edesc *edesc) 397{ 398 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 399 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); 400 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 401 struct caam_rsa_key *key = &ctx->key; 402 struct device *dev = ctx->dev; 403 struct rsa_pub_pdb *pdb = &edesc->pdb.pub; 404 int sec4_sg_index = 0; 405 406 pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE); 407 if (dma_mapping_error(dev, pdb->n_dma)) { 408 dev_err(dev, "Unable to map RSA modulus memory\n"); 409 return -ENOMEM; 410 } 411 412 pdb->e_dma = dma_map_single(dev, key->e, key->e_sz, DMA_TO_DEVICE); 413 if (dma_mapping_error(dev, pdb->e_dma)) { 414 dev_err(dev, "Unable to map RSA public exponent memory\n"); 415 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE); 416 return -ENOMEM; 417 } 418 419 if (edesc->mapped_src_nents > 1) { 420 pdb->sgf |= RSA_PDB_SGF_F; 421 pdb->f_dma = edesc->sec4_sg_dma; 422 sec4_sg_index += edesc->mapped_src_nents; 423 } else { 424 pdb->f_dma = sg_dma_address(req_ctx->fixup_src); 425 } 426 427 if (edesc->mapped_dst_nents > 1) { 428 pdb->sgf |= RSA_PDB_SGF_G; 429 pdb->g_dma = edesc->sec4_sg_dma + 430 sec4_sg_index * sizeof(struct sec4_sg_entry); 431 } else { 432 pdb->g_dma = sg_dma_address(req->dst); 433 } 434 435 pdb->sgf |= (key->e_sz << RSA_PDB_E_SHIFT) | key->n_sz; 436 pdb->f_len = req_ctx->fixup_src_len; 437 438 return 0; 439} 440 441static int set_rsa_priv_f1_pdb(struct akcipher_request *req, 442 struct rsa_edesc *edesc) 443{ 444 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 445 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 446 struct caam_rsa_key *key = &ctx->key; 447 struct device *dev = ctx->dev; 448 struct rsa_priv_f1_pdb *pdb = &edesc->pdb.priv_f1; 449 int sec4_sg_index = 0; 450 451 pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE); 452 if (dma_mapping_error(dev, pdb->n_dma)) { 453 dev_err(dev, "Unable to map modulus memory\n"); 454 return -ENOMEM; 455 } 456 457 pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE); 458 if (dma_mapping_error(dev, pdb->d_dma)) { 459 dev_err(dev, "Unable to map RSA private exponent memory\n"); 460 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE); 461 return -ENOMEM; 462 } 463 464 if (edesc->mapped_src_nents > 1) { 465 pdb->sgf |= RSA_PRIV_PDB_SGF_G; 466 pdb->g_dma = edesc->sec4_sg_dma; 467 sec4_sg_index += edesc->mapped_src_nents; 468 469 } else { 470 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); 471 472 pdb->g_dma = sg_dma_address(req_ctx->fixup_src); 473 } 474 475 if (edesc->mapped_dst_nents > 1) { 476 pdb->sgf |= RSA_PRIV_PDB_SGF_F; 477 pdb->f_dma = edesc->sec4_sg_dma + 478 sec4_sg_index * sizeof(struct sec4_sg_entry); 479 } else { 480 pdb->f_dma = sg_dma_address(req->dst); 481 } 482 483 pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz; 484 485 return 0; 486} 487 488static int set_rsa_priv_f2_pdb(struct akcipher_request *req, 489 struct rsa_edesc *edesc) 490{ 491 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 492 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 493 struct caam_rsa_key *key = &ctx->key; 494 struct device *dev = ctx->dev; 495 struct rsa_priv_f2_pdb *pdb = &edesc->pdb.priv_f2; 496 int sec4_sg_index = 0; 497 size_t p_sz = key->p_sz; 498 size_t q_sz = key->q_sz; 499 500 pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE); 501 if (dma_mapping_error(dev, pdb->d_dma)) { 502 dev_err(dev, "Unable to map RSA private exponent memory\n"); 503 return -ENOMEM; 504 } 505 506 pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE); 507 if (dma_mapping_error(dev, pdb->p_dma)) { 508 dev_err(dev, "Unable to map RSA prime factor p memory\n"); 509 goto unmap_d; 510 } 511 512 pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE); 513 if (dma_mapping_error(dev, pdb->q_dma)) { 514 dev_err(dev, "Unable to map RSA prime factor q memory\n"); 515 goto unmap_p; 516 } 517 518 pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL); 519 if (dma_mapping_error(dev, pdb->tmp1_dma)) { 520 dev_err(dev, "Unable to map RSA tmp1 memory\n"); 521 goto unmap_q; 522 } 523 524 pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL); 525 if (dma_mapping_error(dev, pdb->tmp2_dma)) { 526 dev_err(dev, "Unable to map RSA tmp2 memory\n"); 527 goto unmap_tmp1; 528 } 529 530 if (edesc->mapped_src_nents > 1) { 531 pdb->sgf |= RSA_PRIV_PDB_SGF_G; 532 pdb->g_dma = edesc->sec4_sg_dma; 533 sec4_sg_index += edesc->mapped_src_nents; 534 } else { 535 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); 536 537 pdb->g_dma = sg_dma_address(req_ctx->fixup_src); 538 } 539 540 if (edesc->mapped_dst_nents > 1) { 541 pdb->sgf |= RSA_PRIV_PDB_SGF_F; 542 pdb->f_dma = edesc->sec4_sg_dma + 543 sec4_sg_index * sizeof(struct sec4_sg_entry); 544 } else { 545 pdb->f_dma = sg_dma_address(req->dst); 546 } 547 548 pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz; 549 pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz; 550 551 return 0; 552 553unmap_tmp1: 554 dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL); 555unmap_q: 556 dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE); 557unmap_p: 558 dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE); 559unmap_d: 560 dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE); 561 562 return -ENOMEM; 563} 564 565static int set_rsa_priv_f3_pdb(struct akcipher_request *req, 566 struct rsa_edesc *edesc) 567{ 568 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 569 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 570 struct caam_rsa_key *key = &ctx->key; 571 struct device *dev = ctx->dev; 572 struct rsa_priv_f3_pdb *pdb = &edesc->pdb.priv_f3; 573 int sec4_sg_index = 0; 574 size_t p_sz = key->p_sz; 575 size_t q_sz = key->q_sz; 576 577 pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE); 578 if (dma_mapping_error(dev, pdb->p_dma)) { 579 dev_err(dev, "Unable to map RSA prime factor p memory\n"); 580 return -ENOMEM; 581 } 582 583 pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE); 584 if (dma_mapping_error(dev, pdb->q_dma)) { 585 dev_err(dev, "Unable to map RSA prime factor q memory\n"); 586 goto unmap_p; 587 } 588 589 pdb->dp_dma = dma_map_single(dev, key->dp, p_sz, DMA_TO_DEVICE); 590 if (dma_mapping_error(dev, pdb->dp_dma)) { 591 dev_err(dev, "Unable to map RSA exponent dp memory\n"); 592 goto unmap_q; 593 } 594 595 pdb->dq_dma = dma_map_single(dev, key->dq, q_sz, DMA_TO_DEVICE); 596 if (dma_mapping_error(dev, pdb->dq_dma)) { 597 dev_err(dev, "Unable to map RSA exponent dq memory\n"); 598 goto unmap_dp; 599 } 600 601 pdb->c_dma = dma_map_single(dev, key->qinv, p_sz, DMA_TO_DEVICE); 602 if (dma_mapping_error(dev, pdb->c_dma)) { 603 dev_err(dev, "Unable to map RSA CRT coefficient qinv memory\n"); 604 goto unmap_dq; 605 } 606 607 pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL); 608 if (dma_mapping_error(dev, pdb->tmp1_dma)) { 609 dev_err(dev, "Unable to map RSA tmp1 memory\n"); 610 goto unmap_qinv; 611 } 612 613 pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL); 614 if (dma_mapping_error(dev, pdb->tmp2_dma)) { 615 dev_err(dev, "Unable to map RSA tmp2 memory\n"); 616 goto unmap_tmp1; 617 } 618 619 if (edesc->mapped_src_nents > 1) { 620 pdb->sgf |= RSA_PRIV_PDB_SGF_G; 621 pdb->g_dma = edesc->sec4_sg_dma; 622 sec4_sg_index += edesc->mapped_src_nents; 623 } else { 624 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); 625 626 pdb->g_dma = sg_dma_address(req_ctx->fixup_src); 627 } 628 629 if (edesc->mapped_dst_nents > 1) { 630 pdb->sgf |= RSA_PRIV_PDB_SGF_F; 631 pdb->f_dma = edesc->sec4_sg_dma + 632 sec4_sg_index * sizeof(struct sec4_sg_entry); 633 } else { 634 pdb->f_dma = sg_dma_address(req->dst); 635 } 636 637 pdb->sgf |= key->n_sz; 638 pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz; 639 640 return 0; 641 642unmap_tmp1: 643 dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL); 644unmap_qinv: 645 dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE); 646unmap_dq: 647 dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE); 648unmap_dp: 649 dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE); 650unmap_q: 651 dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE); 652unmap_p: 653 dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE); 654 655 return -ENOMEM; 656} 657 658static int akcipher_enqueue_req(struct device *jrdev, 659 void (*cbk)(struct device *jrdev, u32 *desc, 660 u32 err, void *context), 661 struct akcipher_request *req) 662{ 663 struct caam_drv_private_jr *jrpriv = dev_get_drvdata(jrdev); 664 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 665 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 666 struct caam_rsa_key *key = &ctx->key; 667 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); 668 struct rsa_edesc *edesc = req_ctx->edesc; 669 u32 *desc = edesc->hw_desc; 670 int ret; 671 672 req_ctx->akcipher_op_done = cbk; 673 /* 674 * Only the backlog request are sent to crypto-engine since the others 675 * can be handled by CAAM, if free, especially since JR has up to 1024 676 * entries (more than the 10 entries from crypto-engine). 677 */ 678 if (req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG) 679 ret = crypto_transfer_akcipher_request_to_engine(jrpriv->engine, 680 req); 681 else 682 ret = caam_jr_enqueue(jrdev, desc, cbk, req); 683 684 if ((ret != -EINPROGRESS) && (ret != -EBUSY)) { 685 switch (key->priv_form) { 686 case FORM1: 687 rsa_priv_f1_unmap(jrdev, edesc, req); 688 break; 689 case FORM2: 690 rsa_priv_f2_unmap(jrdev, edesc, req); 691 break; 692 case FORM3: 693 rsa_priv_f3_unmap(jrdev, edesc, req); 694 break; 695 default: 696 rsa_pub_unmap(jrdev, edesc, req); 697 } 698 rsa_io_unmap(jrdev, edesc, req); 699 kfree(edesc); 700 } 701 702 return ret; 703} 704 705static int caam_rsa_enc(struct akcipher_request *req) 706{ 707 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 708 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 709 struct caam_rsa_key *key = &ctx->key; 710 struct device *jrdev = ctx->dev; 711 struct rsa_edesc *edesc; 712 int ret; 713 714 if (unlikely(!key->n || !key->e)) 715 return -EINVAL; 716 717 if (req->dst_len < key->n_sz) { 718 req->dst_len = key->n_sz; 719 dev_err(jrdev, "Output buffer length less than parameter n\n"); 720 return -EOVERFLOW; 721 } 722 723 /* Allocate extended descriptor */ 724 edesc = rsa_edesc_alloc(req, DESC_RSA_PUB_LEN); 725 if (IS_ERR(edesc)) 726 return PTR_ERR(edesc); 727 728 /* Set RSA Encrypt Protocol Data Block */ 729 ret = set_rsa_pub_pdb(req, edesc); 730 if (ret) 731 goto init_fail; 732 733 /* Initialize Job Descriptor */ 734 init_rsa_pub_desc(edesc->hw_desc, &edesc->pdb.pub); 735 736 return akcipher_enqueue_req(jrdev, rsa_pub_done, req); 737 738init_fail: 739 rsa_io_unmap(jrdev, edesc, req); 740 kfree(edesc); 741 return ret; 742} 743 744static int caam_rsa_dec_priv_f1(struct akcipher_request *req) 745{ 746 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 747 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 748 struct device *jrdev = ctx->dev; 749 struct rsa_edesc *edesc; 750 int ret; 751 752 /* Allocate extended descriptor */ 753 edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F1_LEN); 754 if (IS_ERR(edesc)) 755 return PTR_ERR(edesc); 756 757 /* Set RSA Decrypt Protocol Data Block - Private Key Form #1 */ 758 ret = set_rsa_priv_f1_pdb(req, edesc); 759 if (ret) 760 goto init_fail; 761 762 /* Initialize Job Descriptor */ 763 init_rsa_priv_f1_desc(edesc->hw_desc, &edesc->pdb.priv_f1); 764 765 return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req); 766 767init_fail: 768 rsa_io_unmap(jrdev, edesc, req); 769 kfree(edesc); 770 return ret; 771} 772 773static int caam_rsa_dec_priv_f2(struct akcipher_request *req) 774{ 775 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 776 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 777 struct device *jrdev = ctx->dev; 778 struct rsa_edesc *edesc; 779 int ret; 780 781 /* Allocate extended descriptor */ 782 edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F2_LEN); 783 if (IS_ERR(edesc)) 784 return PTR_ERR(edesc); 785 786 /* Set RSA Decrypt Protocol Data Block - Private Key Form #2 */ 787 ret = set_rsa_priv_f2_pdb(req, edesc); 788 if (ret) 789 goto init_fail; 790 791 /* Initialize Job Descriptor */ 792 init_rsa_priv_f2_desc(edesc->hw_desc, &edesc->pdb.priv_f2); 793 794 return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req); 795 796init_fail: 797 rsa_io_unmap(jrdev, edesc, req); 798 kfree(edesc); 799 return ret; 800} 801 802static int caam_rsa_dec_priv_f3(struct akcipher_request *req) 803{ 804 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 805 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 806 struct device *jrdev = ctx->dev; 807 struct rsa_edesc *edesc; 808 int ret; 809 810 /* Allocate extended descriptor */ 811 edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F3_LEN); 812 if (IS_ERR(edesc)) 813 return PTR_ERR(edesc); 814 815 /* Set RSA Decrypt Protocol Data Block - Private Key Form #3 */ 816 ret = set_rsa_priv_f3_pdb(req, edesc); 817 if (ret) 818 goto init_fail; 819 820 /* Initialize Job Descriptor */ 821 init_rsa_priv_f3_desc(edesc->hw_desc, &edesc->pdb.priv_f3); 822 823 return akcipher_enqueue_req(jrdev, rsa_priv_f_done, req); 824 825init_fail: 826 rsa_io_unmap(jrdev, edesc, req); 827 kfree(edesc); 828 return ret; 829} 830 831static int caam_rsa_dec(struct akcipher_request *req) 832{ 833 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 834 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 835 struct caam_rsa_key *key = &ctx->key; 836 int ret; 837 838 if (unlikely(!key->n || !key->d)) 839 return -EINVAL; 840 841 if (req->dst_len < key->n_sz) { 842 req->dst_len = key->n_sz; 843 dev_err(ctx->dev, "Output buffer length less than parameter n\n"); 844 return -EOVERFLOW; 845 } 846 847 if (key->priv_form == FORM3) 848 ret = caam_rsa_dec_priv_f3(req); 849 else if (key->priv_form == FORM2) 850 ret = caam_rsa_dec_priv_f2(req); 851 else 852 ret = caam_rsa_dec_priv_f1(req); 853 854 return ret; 855} 856 857static void caam_rsa_free_key(struct caam_rsa_key *key) 858{ 859 kfree_sensitive(key->d); 860 kfree_sensitive(key->p); 861 kfree_sensitive(key->q); 862 kfree_sensitive(key->dp); 863 kfree_sensitive(key->dq); 864 kfree_sensitive(key->qinv); 865 kfree_sensitive(key->tmp1); 866 kfree_sensitive(key->tmp2); 867 kfree(key->e); 868 kfree(key->n); 869 memset(key, 0, sizeof(*key)); 870} 871 872static void caam_rsa_drop_leading_zeros(const u8 **ptr, size_t *nbytes) 873{ 874 while (!**ptr && *nbytes) { 875 (*ptr)++; 876 (*nbytes)--; 877 } 878} 879 880/** 881 * caam_read_rsa_crt - Used for reading dP, dQ, qInv CRT members. 882 * dP, dQ and qInv could decode to less than corresponding p, q length, as the 883 * BER-encoding requires that the minimum number of bytes be used to encode the 884 * integer. dP, dQ, qInv decoded values have to be zero-padded to appropriate 885 * length. 886 * 887 * @ptr : pointer to {dP, dQ, qInv} CRT member 888 * @nbytes: length in bytes of {dP, dQ, qInv} CRT member 889 * @dstlen: length in bytes of corresponding p or q prime factor 890 */ 891static u8 *caam_read_rsa_crt(const u8 *ptr, size_t nbytes, size_t dstlen) 892{ 893 u8 *dst; 894 895 caam_rsa_drop_leading_zeros(&ptr, &nbytes); 896 if (!nbytes) 897 return NULL; 898 899 dst = kzalloc(dstlen, GFP_DMA | GFP_KERNEL); 900 if (!dst) 901 return NULL; 902 903 memcpy(dst + (dstlen - nbytes), ptr, nbytes); 904 905 return dst; 906} 907 908/** 909 * caam_read_raw_data - Read a raw byte stream as a positive integer. 910 * The function skips buffer's leading zeros, copies the remained data 911 * to a buffer allocated in the GFP_DMA | GFP_KERNEL zone and returns 912 * the address of the new buffer. 913 * 914 * @buf : The data to read 915 * @nbytes: The amount of data to read 916 */ 917static inline u8 *caam_read_raw_data(const u8 *buf, size_t *nbytes) 918{ 919 920 caam_rsa_drop_leading_zeros(&buf, nbytes); 921 if (!*nbytes) 922 return NULL; 923 924 return kmemdup(buf, *nbytes, GFP_DMA | GFP_KERNEL); 925} 926 927static int caam_rsa_check_key_length(unsigned int len) 928{ 929 if (len > 4096) 930 return -EINVAL; 931 return 0; 932} 933 934static int caam_rsa_set_pub_key(struct crypto_akcipher *tfm, const void *key, 935 unsigned int keylen) 936{ 937 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 938 struct rsa_key raw_key = {NULL}; 939 struct caam_rsa_key *rsa_key = &ctx->key; 940 int ret; 941 942 /* Free the old RSA key if any */ 943 caam_rsa_free_key(rsa_key); 944 945 ret = rsa_parse_pub_key(&raw_key, key, keylen); 946 if (ret) 947 return ret; 948 949 /* Copy key in DMA zone */ 950 rsa_key->e = kmemdup(raw_key.e, raw_key.e_sz, GFP_DMA | GFP_KERNEL); 951 if (!rsa_key->e) 952 goto err; 953 954 /* 955 * Skip leading zeros and copy the positive integer to a buffer 956 * allocated in the GFP_DMA | GFP_KERNEL zone. The decryption descriptor 957 * expects a positive integer for the RSA modulus and uses its length as 958 * decryption output length. 959 */ 960 rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz); 961 if (!rsa_key->n) 962 goto err; 963 964 if (caam_rsa_check_key_length(raw_key.n_sz << 3)) { 965 caam_rsa_free_key(rsa_key); 966 return -EINVAL; 967 } 968 969 rsa_key->e_sz = raw_key.e_sz; 970 rsa_key->n_sz = raw_key.n_sz; 971 972 return 0; 973err: 974 caam_rsa_free_key(rsa_key); 975 return -ENOMEM; 976} 977 978static void caam_rsa_set_priv_key_form(struct caam_rsa_ctx *ctx, 979 struct rsa_key *raw_key) 980{ 981 struct caam_rsa_key *rsa_key = &ctx->key; 982 size_t p_sz = raw_key->p_sz; 983 size_t q_sz = raw_key->q_sz; 984 985 rsa_key->p = caam_read_raw_data(raw_key->p, &p_sz); 986 if (!rsa_key->p) 987 return; 988 rsa_key->p_sz = p_sz; 989 990 rsa_key->q = caam_read_raw_data(raw_key->q, &q_sz); 991 if (!rsa_key->q) 992 goto free_p; 993 rsa_key->q_sz = q_sz; 994 995 rsa_key->tmp1 = kzalloc(raw_key->p_sz, GFP_DMA | GFP_KERNEL); 996 if (!rsa_key->tmp1) 997 goto free_q; 998 999 rsa_key->tmp2 = kzalloc(raw_key->q_sz, GFP_DMA | GFP_KERNEL); 1000 if (!rsa_key->tmp2) 1001 goto free_tmp1; 1002 1003 rsa_key->priv_form = FORM2; 1004 1005 rsa_key->dp = caam_read_rsa_crt(raw_key->dp, raw_key->dp_sz, p_sz); 1006 if (!rsa_key->dp) 1007 goto free_tmp2; 1008 1009 rsa_key->dq = caam_read_rsa_crt(raw_key->dq, raw_key->dq_sz, q_sz); 1010 if (!rsa_key->dq) 1011 goto free_dp; 1012 1013 rsa_key->qinv = caam_read_rsa_crt(raw_key->qinv, raw_key->qinv_sz, 1014 q_sz); 1015 if (!rsa_key->qinv) 1016 goto free_dq; 1017 1018 rsa_key->priv_form = FORM3; 1019 1020 return; 1021 1022free_dq: 1023 kfree_sensitive(rsa_key->dq); 1024free_dp: 1025 kfree_sensitive(rsa_key->dp); 1026free_tmp2: 1027 kfree_sensitive(rsa_key->tmp2); 1028free_tmp1: 1029 kfree_sensitive(rsa_key->tmp1); 1030free_q: 1031 kfree_sensitive(rsa_key->q); 1032free_p: 1033 kfree_sensitive(rsa_key->p); 1034} 1035 1036static int caam_rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key, 1037 unsigned int keylen) 1038{ 1039 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 1040 struct rsa_key raw_key = {NULL}; 1041 struct caam_rsa_key *rsa_key = &ctx->key; 1042 int ret; 1043 1044 /* Free the old RSA key if any */ 1045 caam_rsa_free_key(rsa_key); 1046 1047 ret = rsa_parse_priv_key(&raw_key, key, keylen); 1048 if (ret) 1049 return ret; 1050 1051 /* Copy key in DMA zone */ 1052 rsa_key->d = kmemdup(raw_key.d, raw_key.d_sz, GFP_DMA | GFP_KERNEL); 1053 if (!rsa_key->d) 1054 goto err; 1055 1056 rsa_key->e = kmemdup(raw_key.e, raw_key.e_sz, GFP_DMA | GFP_KERNEL); 1057 if (!rsa_key->e) 1058 goto err; 1059 1060 /* 1061 * Skip leading zeros and copy the positive integer to a buffer 1062 * allocated in the GFP_DMA | GFP_KERNEL zone. The decryption descriptor 1063 * expects a positive integer for the RSA modulus and uses its length as 1064 * decryption output length. 1065 */ 1066 rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz); 1067 if (!rsa_key->n) 1068 goto err; 1069 1070 if (caam_rsa_check_key_length(raw_key.n_sz << 3)) { 1071 caam_rsa_free_key(rsa_key); 1072 return -EINVAL; 1073 } 1074 1075 rsa_key->d_sz = raw_key.d_sz; 1076 rsa_key->e_sz = raw_key.e_sz; 1077 rsa_key->n_sz = raw_key.n_sz; 1078 1079 caam_rsa_set_priv_key_form(ctx, &raw_key); 1080 1081 return 0; 1082 1083err: 1084 caam_rsa_free_key(rsa_key); 1085 return -ENOMEM; 1086} 1087 1088static unsigned int caam_rsa_max_size(struct crypto_akcipher *tfm) 1089{ 1090 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 1091 1092 return ctx->key.n_sz; 1093} 1094 1095/* Per session pkc's driver context creation function */ 1096static int caam_rsa_init_tfm(struct crypto_akcipher *tfm) 1097{ 1098 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 1099 1100 ctx->dev = caam_jr_alloc(); 1101 1102 if (IS_ERR(ctx->dev)) { 1103 pr_err("Job Ring Device allocation for transform failed\n"); 1104 return PTR_ERR(ctx->dev); 1105 } 1106 1107 ctx->padding_dma = dma_map_single(ctx->dev, zero_buffer, 1108 CAAM_RSA_MAX_INPUT_SIZE - 1, 1109 DMA_TO_DEVICE); 1110 if (dma_mapping_error(ctx->dev, ctx->padding_dma)) { 1111 dev_err(ctx->dev, "unable to map padding\n"); 1112 caam_jr_free(ctx->dev); 1113 return -ENOMEM; 1114 } 1115 1116 ctx->enginectx.op.do_one_request = akcipher_do_one_req; 1117 1118 return 0; 1119} 1120 1121/* Per session pkc's driver context cleanup function */ 1122static void caam_rsa_exit_tfm(struct crypto_akcipher *tfm) 1123{ 1124 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 1125 struct caam_rsa_key *key = &ctx->key; 1126 1127 dma_unmap_single(ctx->dev, ctx->padding_dma, CAAM_RSA_MAX_INPUT_SIZE - 1128 1, DMA_TO_DEVICE); 1129 caam_rsa_free_key(key); 1130 caam_jr_free(ctx->dev); 1131} 1132 1133static struct caam_akcipher_alg caam_rsa = { 1134 .akcipher = { 1135 .encrypt = caam_rsa_enc, 1136 .decrypt = caam_rsa_dec, 1137 .set_pub_key = caam_rsa_set_pub_key, 1138 .set_priv_key = caam_rsa_set_priv_key, 1139 .max_size = caam_rsa_max_size, 1140 .init = caam_rsa_init_tfm, 1141 .exit = caam_rsa_exit_tfm, 1142 .reqsize = sizeof(struct caam_rsa_req_ctx), 1143 .base = { 1144 .cra_name = "rsa", 1145 .cra_driver_name = "rsa-caam", 1146 .cra_priority = 3000, 1147 .cra_module = THIS_MODULE, 1148 .cra_ctxsize = sizeof(struct caam_rsa_ctx), 1149 }, 1150 } 1151}; 1152 1153/* Public Key Cryptography module initialization handler */ 1154int caam_pkc_init(struct device *ctrldev) 1155{ 1156 struct caam_drv_private *priv = dev_get_drvdata(ctrldev); 1157 u32 pk_inst, pkha; 1158 int err; 1159 init_done = false; 1160 1161 /* Determine public key hardware accelerator presence. */ 1162 if (priv->era < 10) { 1163 pk_inst = (rd_reg32(&priv->ctrl->perfmon.cha_num_ls) & 1164 CHA_ID_LS_PK_MASK) >> CHA_ID_LS_PK_SHIFT; 1165 } else { 1166 pkha = rd_reg32(&priv->ctrl->vreg.pkha); 1167 pk_inst = pkha & CHA_VER_NUM_MASK; 1168 1169 /* 1170 * Newer CAAMs support partially disabled functionality. If this is the 1171 * case, the number is non-zero, but this bit is set to indicate that 1172 * no encryption or decryption is supported. Only signing and verifying 1173 * is supported. 1174 */ 1175 if (pkha & CHA_VER_MISC_PKHA_NO_CRYPT) 1176 pk_inst = 0; 1177 } 1178 1179 /* Do not register algorithms if PKHA is not present. */ 1180 if (!pk_inst) 1181 return 0; 1182 1183 /* allocate zero buffer, used for padding input */ 1184 zero_buffer = kzalloc(CAAM_RSA_MAX_INPUT_SIZE - 1, GFP_DMA | 1185 GFP_KERNEL); 1186 if (!zero_buffer) 1187 return -ENOMEM; 1188 1189 err = crypto_register_akcipher(&caam_rsa.akcipher); 1190 1191 if (err) { 1192 kfree(zero_buffer); 1193 dev_warn(ctrldev, "%s alg registration failed\n", 1194 caam_rsa.akcipher.base.cra_driver_name); 1195 } else { 1196 init_done = true; 1197 caam_rsa.registered = true; 1198 dev_info(ctrldev, "caam pkc algorithms registered in /proc/crypto\n"); 1199 } 1200 1201 return err; 1202} 1203 1204void caam_pkc_exit(void) 1205{ 1206 if (!init_done) 1207 return; 1208 1209 if (caam_rsa.registered) 1210 crypto_unregister_akcipher(&caam_rsa.akcipher); 1211 1212 kfree(zero_buffer); 1213} 1214