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 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(struct rsa_pub_pdb)) 21 #define DESC_RSA_PRIV_F1_LEN (2 * CAAM_CMD_SZ + \ 22 sizeof(struct rsa_priv_f1_pdb)) 23 #define DESC_RSA_PRIV_F2_LEN (2 * CAAM_CMD_SZ + \ 24 sizeof(struct rsa_priv_f2_pdb)) 25 #define DESC_RSA_PRIV_F3_LEN (2 * CAAM_CMD_SZ + \ 26 sizeof(struct rsa_priv_f3_pdb)) 27 28 static void rsa_io_unmap(struct device *dev, struct rsa_edesc *edesc, 29 struct akcipher_request *req) 30 { 31 dma_unmap_sg(dev, req->dst, edesc->dst_nents, DMA_FROM_DEVICE); 32 dma_unmap_sg(dev, req->src, edesc->src_nents, DMA_TO_DEVICE); 33 34 if (edesc->sec4_sg_bytes) 35 dma_unmap_single(dev, edesc->sec4_sg_dma, edesc->sec4_sg_bytes, 36 DMA_TO_DEVICE); 37 } 38 39 static void rsa_pub_unmap(struct device *dev, struct rsa_edesc *edesc, 40 struct akcipher_request *req) 41 { 42 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 43 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 44 struct caam_rsa_key *key = &ctx->key; 45 struct rsa_pub_pdb *pdb = &edesc->pdb.pub; 46 47 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE); 48 dma_unmap_single(dev, pdb->e_dma, key->e_sz, DMA_TO_DEVICE); 49 } 50 51 static void rsa_priv_f1_unmap(struct device *dev, struct rsa_edesc *edesc, 52 struct akcipher_request *req) 53 { 54 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 55 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 56 struct caam_rsa_key *key = &ctx->key; 57 struct rsa_priv_f1_pdb *pdb = &edesc->pdb.priv_f1; 58 59 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE); 60 dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE); 61 } 62 63 static void rsa_priv_f2_unmap(struct device *dev, struct rsa_edesc *edesc, 64 struct akcipher_request *req) 65 { 66 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 67 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 68 struct caam_rsa_key *key = &ctx->key; 69 struct rsa_priv_f2_pdb *pdb = &edesc->pdb.priv_f2; 70 size_t p_sz = key->p_sz; 71 size_t q_sz = key->q_sz; 72 73 dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE); 74 dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE); 75 dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE); 76 dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL); 77 dma_unmap_single(dev, pdb->tmp2_dma, q_sz, DMA_BIDIRECTIONAL); 78 } 79 80 static void rsa_priv_f3_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_f3_pdb *pdb = &edesc->pdb.priv_f3; 87 size_t p_sz = key->p_sz; 88 size_t q_sz = key->q_sz; 89 90 dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE); 91 dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE); 92 dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE); 93 dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE); 94 dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE); 95 dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL); 96 dma_unmap_single(dev, pdb->tmp2_dma, q_sz, DMA_BIDIRECTIONAL); 97 } 98 99 /* RSA Job Completion handler */ 100 static void rsa_pub_done(struct device *dev, u32 *desc, u32 err, void *context) 101 { 102 struct akcipher_request *req = context; 103 struct rsa_edesc *edesc; 104 105 if (err) 106 caam_jr_strstatus(dev, err); 107 108 edesc = container_of(desc, struct rsa_edesc, hw_desc[0]); 109 110 rsa_pub_unmap(dev, edesc, req); 111 rsa_io_unmap(dev, edesc, req); 112 kfree(edesc); 113 114 akcipher_request_complete(req, err); 115 } 116 117 static void rsa_priv_f1_done(struct device *dev, u32 *desc, u32 err, 118 void *context) 119 { 120 struct akcipher_request *req = context; 121 struct rsa_edesc *edesc; 122 123 if (err) 124 caam_jr_strstatus(dev, err); 125 126 edesc = container_of(desc, struct rsa_edesc, hw_desc[0]); 127 128 rsa_priv_f1_unmap(dev, edesc, req); 129 rsa_io_unmap(dev, edesc, req); 130 kfree(edesc); 131 132 akcipher_request_complete(req, err); 133 } 134 135 static void rsa_priv_f2_done(struct device *dev, u32 *desc, u32 err, 136 void *context) 137 { 138 struct akcipher_request *req = context; 139 struct rsa_edesc *edesc; 140 141 if (err) 142 caam_jr_strstatus(dev, err); 143 144 edesc = container_of(desc, struct rsa_edesc, hw_desc[0]); 145 146 rsa_priv_f2_unmap(dev, edesc, req); 147 rsa_io_unmap(dev, edesc, req); 148 kfree(edesc); 149 150 akcipher_request_complete(req, err); 151 } 152 153 static void rsa_priv_f3_done(struct device *dev, u32 *desc, u32 err, 154 void *context) 155 { 156 struct akcipher_request *req = context; 157 struct rsa_edesc *edesc; 158 159 if (err) 160 caam_jr_strstatus(dev, err); 161 162 edesc = container_of(desc, struct rsa_edesc, hw_desc[0]); 163 164 rsa_priv_f3_unmap(dev, edesc, req); 165 rsa_io_unmap(dev, edesc, req); 166 kfree(edesc); 167 168 akcipher_request_complete(req, err); 169 } 170 171 static int caam_rsa_count_leading_zeros(struct scatterlist *sgl, 172 unsigned int nbytes, 173 unsigned int flags) 174 { 175 struct sg_mapping_iter miter; 176 int lzeros, ents; 177 unsigned int len; 178 unsigned int tbytes = nbytes; 179 const u8 *buff; 180 181 ents = sg_nents_for_len(sgl, nbytes); 182 if (ents < 0) 183 return ents; 184 185 sg_miter_start(&miter, sgl, ents, SG_MITER_FROM_SG | flags); 186 187 lzeros = 0; 188 len = 0; 189 while (nbytes > 0) { 190 while (len && !*buff) { 191 lzeros++; 192 len--; 193 buff++; 194 } 195 196 if (len && *buff) 197 break; 198 199 sg_miter_next(&miter); 200 buff = miter.addr; 201 len = miter.length; 202 203 nbytes -= lzeros; 204 lzeros = 0; 205 } 206 207 miter.consumed = lzeros; 208 sg_miter_stop(&miter); 209 nbytes -= lzeros; 210 211 return tbytes - nbytes; 212 } 213 214 static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req, 215 size_t desclen) 216 { 217 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 218 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 219 struct device *dev = ctx->dev; 220 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req); 221 struct rsa_edesc *edesc; 222 gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? 223 GFP_KERNEL : GFP_ATOMIC; 224 int sg_flags = (flags == GFP_ATOMIC) ? SG_MITER_ATOMIC : 0; 225 int sgc; 226 int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes; 227 int src_nents, dst_nents; 228 int lzeros; 229 230 lzeros = caam_rsa_count_leading_zeros(req->src, req->src_len, sg_flags); 231 if (lzeros < 0) 232 return ERR_PTR(lzeros); 233 234 req->src_len -= lzeros; 235 req->src = scatterwalk_ffwd(req_ctx->src, req->src, lzeros); 236 237 src_nents = sg_nents_for_len(req->src, req->src_len); 238 dst_nents = sg_nents_for_len(req->dst, req->dst_len); 239 240 if (src_nents > 1) 241 sec4_sg_len = src_nents; 242 if (dst_nents > 1) 243 sec4_sg_len += dst_nents; 244 245 sec4_sg_bytes = sec4_sg_len * sizeof(struct sec4_sg_entry); 246 247 /* allocate space for base edesc, hw desc commands and link tables */ 248 edesc = kzalloc(sizeof(*edesc) + desclen + sec4_sg_bytes, 249 GFP_DMA | flags); 250 if (!edesc) 251 return ERR_PTR(-ENOMEM); 252 253 sgc = dma_map_sg(dev, req->src, src_nents, DMA_TO_DEVICE); 254 if (unlikely(!sgc)) { 255 dev_err(dev, "unable to map source\n"); 256 goto src_fail; 257 } 258 259 sgc = dma_map_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE); 260 if (unlikely(!sgc)) { 261 dev_err(dev, "unable to map destination\n"); 262 goto dst_fail; 263 } 264 265 edesc->sec4_sg = (void *)edesc + sizeof(*edesc) + desclen; 266 267 sec4_sg_index = 0; 268 if (src_nents > 1) { 269 sg_to_sec4_sg_last(req->src, src_nents, edesc->sec4_sg, 0); 270 sec4_sg_index += src_nents; 271 } 272 if (dst_nents > 1) 273 sg_to_sec4_sg_last(req->dst, dst_nents, 274 edesc->sec4_sg + sec4_sg_index, 0); 275 276 /* Save nents for later use in Job Descriptor */ 277 edesc->src_nents = src_nents; 278 edesc->dst_nents = dst_nents; 279 280 if (!sec4_sg_bytes) 281 return edesc; 282 283 edesc->sec4_sg_dma = dma_map_single(dev, edesc->sec4_sg, 284 sec4_sg_bytes, DMA_TO_DEVICE); 285 if (dma_mapping_error(dev, edesc->sec4_sg_dma)) { 286 dev_err(dev, "unable to map S/G table\n"); 287 goto sec4_sg_fail; 288 } 289 290 edesc->sec4_sg_bytes = sec4_sg_bytes; 291 292 return edesc; 293 294 sec4_sg_fail: 295 dma_unmap_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE); 296 dst_fail: 297 dma_unmap_sg(dev, req->src, src_nents, DMA_TO_DEVICE); 298 src_fail: 299 kfree(edesc); 300 return ERR_PTR(-ENOMEM); 301 } 302 303 static int set_rsa_pub_pdb(struct akcipher_request *req, 304 struct rsa_edesc *edesc) 305 { 306 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 307 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 308 struct caam_rsa_key *key = &ctx->key; 309 struct device *dev = ctx->dev; 310 struct rsa_pub_pdb *pdb = &edesc->pdb.pub; 311 int sec4_sg_index = 0; 312 313 pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE); 314 if (dma_mapping_error(dev, pdb->n_dma)) { 315 dev_err(dev, "Unable to map RSA modulus memory\n"); 316 return -ENOMEM; 317 } 318 319 pdb->e_dma = dma_map_single(dev, key->e, key->e_sz, DMA_TO_DEVICE); 320 if (dma_mapping_error(dev, pdb->e_dma)) { 321 dev_err(dev, "Unable to map RSA public exponent memory\n"); 322 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE); 323 return -ENOMEM; 324 } 325 326 if (edesc->src_nents > 1) { 327 pdb->sgf |= RSA_PDB_SGF_F; 328 pdb->f_dma = edesc->sec4_sg_dma; 329 sec4_sg_index += edesc->src_nents; 330 } else { 331 pdb->f_dma = sg_dma_address(req->src); 332 } 333 334 if (edesc->dst_nents > 1) { 335 pdb->sgf |= RSA_PDB_SGF_G; 336 pdb->g_dma = edesc->sec4_sg_dma + 337 sec4_sg_index * sizeof(struct sec4_sg_entry); 338 } else { 339 pdb->g_dma = sg_dma_address(req->dst); 340 } 341 342 pdb->sgf |= (key->e_sz << RSA_PDB_E_SHIFT) | key->n_sz; 343 pdb->f_len = req->src_len; 344 345 return 0; 346 } 347 348 static int set_rsa_priv_f1_pdb(struct akcipher_request *req, 349 struct rsa_edesc *edesc) 350 { 351 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 352 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 353 struct caam_rsa_key *key = &ctx->key; 354 struct device *dev = ctx->dev; 355 struct rsa_priv_f1_pdb *pdb = &edesc->pdb.priv_f1; 356 int sec4_sg_index = 0; 357 358 pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE); 359 if (dma_mapping_error(dev, pdb->n_dma)) { 360 dev_err(dev, "Unable to map modulus memory\n"); 361 return -ENOMEM; 362 } 363 364 pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE); 365 if (dma_mapping_error(dev, pdb->d_dma)) { 366 dev_err(dev, "Unable to map RSA private exponent memory\n"); 367 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE); 368 return -ENOMEM; 369 } 370 371 if (edesc->src_nents > 1) { 372 pdb->sgf |= RSA_PRIV_PDB_SGF_G; 373 pdb->g_dma = edesc->sec4_sg_dma; 374 sec4_sg_index += edesc->src_nents; 375 } else { 376 pdb->g_dma = sg_dma_address(req->src); 377 } 378 379 if (edesc->dst_nents > 1) { 380 pdb->sgf |= RSA_PRIV_PDB_SGF_F; 381 pdb->f_dma = edesc->sec4_sg_dma + 382 sec4_sg_index * sizeof(struct sec4_sg_entry); 383 } else { 384 pdb->f_dma = sg_dma_address(req->dst); 385 } 386 387 pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz; 388 389 return 0; 390 } 391 392 static int set_rsa_priv_f2_pdb(struct akcipher_request *req, 393 struct rsa_edesc *edesc) 394 { 395 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 396 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 397 struct caam_rsa_key *key = &ctx->key; 398 struct device *dev = ctx->dev; 399 struct rsa_priv_f2_pdb *pdb = &edesc->pdb.priv_f2; 400 int sec4_sg_index = 0; 401 size_t p_sz = key->p_sz; 402 size_t q_sz = key->q_sz; 403 404 pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE); 405 if (dma_mapping_error(dev, pdb->d_dma)) { 406 dev_err(dev, "Unable to map RSA private exponent memory\n"); 407 return -ENOMEM; 408 } 409 410 pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE); 411 if (dma_mapping_error(dev, pdb->p_dma)) { 412 dev_err(dev, "Unable to map RSA prime factor p memory\n"); 413 goto unmap_d; 414 } 415 416 pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE); 417 if (dma_mapping_error(dev, pdb->q_dma)) { 418 dev_err(dev, "Unable to map RSA prime factor q memory\n"); 419 goto unmap_p; 420 } 421 422 pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL); 423 if (dma_mapping_error(dev, pdb->tmp1_dma)) { 424 dev_err(dev, "Unable to map RSA tmp1 memory\n"); 425 goto unmap_q; 426 } 427 428 pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL); 429 if (dma_mapping_error(dev, pdb->tmp2_dma)) { 430 dev_err(dev, "Unable to map RSA tmp2 memory\n"); 431 goto unmap_tmp1; 432 } 433 434 if (edesc->src_nents > 1) { 435 pdb->sgf |= RSA_PRIV_PDB_SGF_G; 436 pdb->g_dma = edesc->sec4_sg_dma; 437 sec4_sg_index += edesc->src_nents; 438 } else { 439 pdb->g_dma = sg_dma_address(req->src); 440 } 441 442 if (edesc->dst_nents > 1) { 443 pdb->sgf |= RSA_PRIV_PDB_SGF_F; 444 pdb->f_dma = edesc->sec4_sg_dma + 445 sec4_sg_index * sizeof(struct sec4_sg_entry); 446 } else { 447 pdb->f_dma = sg_dma_address(req->dst); 448 } 449 450 pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz; 451 pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz; 452 453 return 0; 454 455 unmap_tmp1: 456 dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL); 457 unmap_q: 458 dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE); 459 unmap_p: 460 dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE); 461 unmap_d: 462 dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE); 463 464 return -ENOMEM; 465 } 466 467 static int set_rsa_priv_f3_pdb(struct akcipher_request *req, 468 struct rsa_edesc *edesc) 469 { 470 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 471 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 472 struct caam_rsa_key *key = &ctx->key; 473 struct device *dev = ctx->dev; 474 struct rsa_priv_f3_pdb *pdb = &edesc->pdb.priv_f3; 475 int sec4_sg_index = 0; 476 size_t p_sz = key->p_sz; 477 size_t q_sz = key->q_sz; 478 479 pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE); 480 if (dma_mapping_error(dev, pdb->p_dma)) { 481 dev_err(dev, "Unable to map RSA prime factor p memory\n"); 482 return -ENOMEM; 483 } 484 485 pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE); 486 if (dma_mapping_error(dev, pdb->q_dma)) { 487 dev_err(dev, "Unable to map RSA prime factor q memory\n"); 488 goto unmap_p; 489 } 490 491 pdb->dp_dma = dma_map_single(dev, key->dp, p_sz, DMA_TO_DEVICE); 492 if (dma_mapping_error(dev, pdb->dp_dma)) { 493 dev_err(dev, "Unable to map RSA exponent dp memory\n"); 494 goto unmap_q; 495 } 496 497 pdb->dq_dma = dma_map_single(dev, key->dq, q_sz, DMA_TO_DEVICE); 498 if (dma_mapping_error(dev, pdb->dq_dma)) { 499 dev_err(dev, "Unable to map RSA exponent dq memory\n"); 500 goto unmap_dp; 501 } 502 503 pdb->c_dma = dma_map_single(dev, key->qinv, p_sz, DMA_TO_DEVICE); 504 if (dma_mapping_error(dev, pdb->c_dma)) { 505 dev_err(dev, "Unable to map RSA CRT coefficient qinv memory\n"); 506 goto unmap_dq; 507 } 508 509 pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL); 510 if (dma_mapping_error(dev, pdb->tmp1_dma)) { 511 dev_err(dev, "Unable to map RSA tmp1 memory\n"); 512 goto unmap_qinv; 513 } 514 515 pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL); 516 if (dma_mapping_error(dev, pdb->tmp2_dma)) { 517 dev_err(dev, "Unable to map RSA tmp2 memory\n"); 518 goto unmap_tmp1; 519 } 520 521 if (edesc->src_nents > 1) { 522 pdb->sgf |= RSA_PRIV_PDB_SGF_G; 523 pdb->g_dma = edesc->sec4_sg_dma; 524 sec4_sg_index += edesc->src_nents; 525 } else { 526 pdb->g_dma = sg_dma_address(req->src); 527 } 528 529 if (edesc->dst_nents > 1) { 530 pdb->sgf |= RSA_PRIV_PDB_SGF_F; 531 pdb->f_dma = edesc->sec4_sg_dma + 532 sec4_sg_index * sizeof(struct sec4_sg_entry); 533 } else { 534 pdb->f_dma = sg_dma_address(req->dst); 535 } 536 537 pdb->sgf |= key->n_sz; 538 pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz; 539 540 return 0; 541 542 unmap_tmp1: 543 dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL); 544 unmap_qinv: 545 dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE); 546 unmap_dq: 547 dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE); 548 unmap_dp: 549 dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE); 550 unmap_q: 551 dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE); 552 unmap_p: 553 dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE); 554 555 return -ENOMEM; 556 } 557 558 static int caam_rsa_enc(struct akcipher_request *req) 559 { 560 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 561 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 562 struct caam_rsa_key *key = &ctx->key; 563 struct device *jrdev = ctx->dev; 564 struct rsa_edesc *edesc; 565 int ret; 566 567 if (unlikely(!key->n || !key->e)) 568 return -EINVAL; 569 570 if (req->dst_len < key->n_sz) { 571 req->dst_len = key->n_sz; 572 dev_err(jrdev, "Output buffer length less than parameter n\n"); 573 return -EOVERFLOW; 574 } 575 576 /* Allocate extended descriptor */ 577 edesc = rsa_edesc_alloc(req, DESC_RSA_PUB_LEN); 578 if (IS_ERR(edesc)) 579 return PTR_ERR(edesc); 580 581 /* Set RSA Encrypt Protocol Data Block */ 582 ret = set_rsa_pub_pdb(req, edesc); 583 if (ret) 584 goto init_fail; 585 586 /* Initialize Job Descriptor */ 587 init_rsa_pub_desc(edesc->hw_desc, &edesc->pdb.pub); 588 589 ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_pub_done, req); 590 if (!ret) 591 return -EINPROGRESS; 592 593 rsa_pub_unmap(jrdev, edesc, req); 594 595 init_fail: 596 rsa_io_unmap(jrdev, edesc, req); 597 kfree(edesc); 598 return ret; 599 } 600 601 static int caam_rsa_dec_priv_f1(struct akcipher_request *req) 602 { 603 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 604 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 605 struct device *jrdev = ctx->dev; 606 struct rsa_edesc *edesc; 607 int ret; 608 609 /* Allocate extended descriptor */ 610 edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F1_LEN); 611 if (IS_ERR(edesc)) 612 return PTR_ERR(edesc); 613 614 /* Set RSA Decrypt Protocol Data Block - Private Key Form #1 */ 615 ret = set_rsa_priv_f1_pdb(req, edesc); 616 if (ret) 617 goto init_fail; 618 619 /* Initialize Job Descriptor */ 620 init_rsa_priv_f1_desc(edesc->hw_desc, &edesc->pdb.priv_f1); 621 622 ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f1_done, req); 623 if (!ret) 624 return -EINPROGRESS; 625 626 rsa_priv_f1_unmap(jrdev, edesc, req); 627 628 init_fail: 629 rsa_io_unmap(jrdev, edesc, req); 630 kfree(edesc); 631 return ret; 632 } 633 634 static int caam_rsa_dec_priv_f2(struct akcipher_request *req) 635 { 636 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 637 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 638 struct device *jrdev = ctx->dev; 639 struct rsa_edesc *edesc; 640 int ret; 641 642 /* Allocate extended descriptor */ 643 edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F2_LEN); 644 if (IS_ERR(edesc)) 645 return PTR_ERR(edesc); 646 647 /* Set RSA Decrypt Protocol Data Block - Private Key Form #2 */ 648 ret = set_rsa_priv_f2_pdb(req, edesc); 649 if (ret) 650 goto init_fail; 651 652 /* Initialize Job Descriptor */ 653 init_rsa_priv_f2_desc(edesc->hw_desc, &edesc->pdb.priv_f2); 654 655 ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f2_done, req); 656 if (!ret) 657 return -EINPROGRESS; 658 659 rsa_priv_f2_unmap(jrdev, edesc, req); 660 661 init_fail: 662 rsa_io_unmap(jrdev, edesc, req); 663 kfree(edesc); 664 return ret; 665 } 666 667 static int caam_rsa_dec_priv_f3(struct akcipher_request *req) 668 { 669 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 670 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 671 struct device *jrdev = ctx->dev; 672 struct rsa_edesc *edesc; 673 int ret; 674 675 /* Allocate extended descriptor */ 676 edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F3_LEN); 677 if (IS_ERR(edesc)) 678 return PTR_ERR(edesc); 679 680 /* Set RSA Decrypt Protocol Data Block - Private Key Form #3 */ 681 ret = set_rsa_priv_f3_pdb(req, edesc); 682 if (ret) 683 goto init_fail; 684 685 /* Initialize Job Descriptor */ 686 init_rsa_priv_f3_desc(edesc->hw_desc, &edesc->pdb.priv_f3); 687 688 ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f3_done, req); 689 if (!ret) 690 return -EINPROGRESS; 691 692 rsa_priv_f3_unmap(jrdev, edesc, req); 693 694 init_fail: 695 rsa_io_unmap(jrdev, edesc, req); 696 kfree(edesc); 697 return ret; 698 } 699 700 static int caam_rsa_dec(struct akcipher_request *req) 701 { 702 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 703 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 704 struct caam_rsa_key *key = &ctx->key; 705 int ret; 706 707 if (unlikely(!key->n || !key->d)) 708 return -EINVAL; 709 710 if (req->dst_len < key->n_sz) { 711 req->dst_len = key->n_sz; 712 dev_err(ctx->dev, "Output buffer length less than parameter n\n"); 713 return -EOVERFLOW; 714 } 715 716 if (key->priv_form == FORM3) 717 ret = caam_rsa_dec_priv_f3(req); 718 else if (key->priv_form == FORM2) 719 ret = caam_rsa_dec_priv_f2(req); 720 else 721 ret = caam_rsa_dec_priv_f1(req); 722 723 return ret; 724 } 725 726 static void caam_rsa_free_key(struct caam_rsa_key *key) 727 { 728 kzfree(key->d); 729 kzfree(key->p); 730 kzfree(key->q); 731 kzfree(key->dp); 732 kzfree(key->dq); 733 kzfree(key->qinv); 734 kzfree(key->tmp1); 735 kzfree(key->tmp2); 736 kfree(key->e); 737 kfree(key->n); 738 memset(key, 0, sizeof(*key)); 739 } 740 741 static void caam_rsa_drop_leading_zeros(const u8 **ptr, size_t *nbytes) 742 { 743 while (!**ptr && *nbytes) { 744 (*ptr)++; 745 (*nbytes)--; 746 } 747 } 748 749 /** 750 * caam_read_rsa_crt - Used for reading dP, dQ, qInv CRT members. 751 * dP, dQ and qInv could decode to less than corresponding p, q length, as the 752 * BER-encoding requires that the minimum number of bytes be used to encode the 753 * integer. dP, dQ, qInv decoded values have to be zero-padded to appropriate 754 * length. 755 * 756 * @ptr : pointer to {dP, dQ, qInv} CRT member 757 * @nbytes: length in bytes of {dP, dQ, qInv} CRT member 758 * @dstlen: length in bytes of corresponding p or q prime factor 759 */ 760 static u8 *caam_read_rsa_crt(const u8 *ptr, size_t nbytes, size_t dstlen) 761 { 762 u8 *dst; 763 764 caam_rsa_drop_leading_zeros(&ptr, &nbytes); 765 if (!nbytes) 766 return NULL; 767 768 dst = kzalloc(dstlen, GFP_DMA | GFP_KERNEL); 769 if (!dst) 770 return NULL; 771 772 memcpy(dst + (dstlen - nbytes), ptr, nbytes); 773 774 return dst; 775 } 776 777 /** 778 * caam_read_raw_data - Read a raw byte stream as a positive integer. 779 * The function skips buffer's leading zeros, copies the remained data 780 * to a buffer allocated in the GFP_DMA | GFP_KERNEL zone and returns 781 * the address of the new buffer. 782 * 783 * @buf : The data to read 784 * @nbytes: The amount of data to read 785 */ 786 static inline u8 *caam_read_raw_data(const u8 *buf, size_t *nbytes) 787 { 788 789 caam_rsa_drop_leading_zeros(&buf, nbytes); 790 if (!*nbytes) 791 return NULL; 792 793 return kmemdup(buf, *nbytes, GFP_DMA | GFP_KERNEL); 794 } 795 796 static int caam_rsa_check_key_length(unsigned int len) 797 { 798 if (len > 4096) 799 return -EINVAL; 800 return 0; 801 } 802 803 static int caam_rsa_set_pub_key(struct crypto_akcipher *tfm, const void *key, 804 unsigned int keylen) 805 { 806 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 807 struct rsa_key raw_key = {NULL}; 808 struct caam_rsa_key *rsa_key = &ctx->key; 809 int ret; 810 811 /* Free the old RSA key if any */ 812 caam_rsa_free_key(rsa_key); 813 814 ret = rsa_parse_pub_key(&raw_key, key, keylen); 815 if (ret) 816 return ret; 817 818 /* Copy key in DMA zone */ 819 rsa_key->e = kzalloc(raw_key.e_sz, GFP_DMA | GFP_KERNEL); 820 if (!rsa_key->e) 821 goto err; 822 823 /* 824 * Skip leading zeros and copy the positive integer to a buffer 825 * allocated in the GFP_DMA | GFP_KERNEL zone. The decryption descriptor 826 * expects a positive integer for the RSA modulus and uses its length as 827 * decryption output length. 828 */ 829 rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz); 830 if (!rsa_key->n) 831 goto err; 832 833 if (caam_rsa_check_key_length(raw_key.n_sz << 3)) { 834 caam_rsa_free_key(rsa_key); 835 return -EINVAL; 836 } 837 838 rsa_key->e_sz = raw_key.e_sz; 839 rsa_key->n_sz = raw_key.n_sz; 840 841 memcpy(rsa_key->e, raw_key.e, raw_key.e_sz); 842 843 return 0; 844 err: 845 caam_rsa_free_key(rsa_key); 846 return -ENOMEM; 847 } 848 849 static void caam_rsa_set_priv_key_form(struct caam_rsa_ctx *ctx, 850 struct rsa_key *raw_key) 851 { 852 struct caam_rsa_key *rsa_key = &ctx->key; 853 size_t p_sz = raw_key->p_sz; 854 size_t q_sz = raw_key->q_sz; 855 856 rsa_key->p = caam_read_raw_data(raw_key->p, &p_sz); 857 if (!rsa_key->p) 858 return; 859 rsa_key->p_sz = p_sz; 860 861 rsa_key->q = caam_read_raw_data(raw_key->q, &q_sz); 862 if (!rsa_key->q) 863 goto free_p; 864 rsa_key->q_sz = q_sz; 865 866 rsa_key->tmp1 = kzalloc(raw_key->p_sz, GFP_DMA | GFP_KERNEL); 867 if (!rsa_key->tmp1) 868 goto free_q; 869 870 rsa_key->tmp2 = kzalloc(raw_key->q_sz, GFP_DMA | GFP_KERNEL); 871 if (!rsa_key->tmp2) 872 goto free_tmp1; 873 874 rsa_key->priv_form = FORM2; 875 876 rsa_key->dp = caam_read_rsa_crt(raw_key->dp, raw_key->dp_sz, p_sz); 877 if (!rsa_key->dp) 878 goto free_tmp2; 879 880 rsa_key->dq = caam_read_rsa_crt(raw_key->dq, raw_key->dq_sz, q_sz); 881 if (!rsa_key->dq) 882 goto free_dp; 883 884 rsa_key->qinv = caam_read_rsa_crt(raw_key->qinv, raw_key->qinv_sz, 885 q_sz); 886 if (!rsa_key->qinv) 887 goto free_dq; 888 889 rsa_key->priv_form = FORM3; 890 891 return; 892 893 free_dq: 894 kzfree(rsa_key->dq); 895 free_dp: 896 kzfree(rsa_key->dp); 897 free_tmp2: 898 kzfree(rsa_key->tmp2); 899 free_tmp1: 900 kzfree(rsa_key->tmp1); 901 free_q: 902 kzfree(rsa_key->q); 903 free_p: 904 kzfree(rsa_key->p); 905 } 906 907 static int caam_rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key, 908 unsigned int keylen) 909 { 910 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 911 struct rsa_key raw_key = {NULL}; 912 struct caam_rsa_key *rsa_key = &ctx->key; 913 int ret; 914 915 /* Free the old RSA key if any */ 916 caam_rsa_free_key(rsa_key); 917 918 ret = rsa_parse_priv_key(&raw_key, key, keylen); 919 if (ret) 920 return ret; 921 922 /* Copy key in DMA zone */ 923 rsa_key->d = kzalloc(raw_key.d_sz, GFP_DMA | GFP_KERNEL); 924 if (!rsa_key->d) 925 goto err; 926 927 rsa_key->e = kzalloc(raw_key.e_sz, GFP_DMA | GFP_KERNEL); 928 if (!rsa_key->e) 929 goto err; 930 931 /* 932 * Skip leading zeros and copy the positive integer to a buffer 933 * allocated in the GFP_DMA | GFP_KERNEL zone. The decryption descriptor 934 * expects a positive integer for the RSA modulus and uses its length as 935 * decryption output length. 936 */ 937 rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz); 938 if (!rsa_key->n) 939 goto err; 940 941 if (caam_rsa_check_key_length(raw_key.n_sz << 3)) { 942 caam_rsa_free_key(rsa_key); 943 return -EINVAL; 944 } 945 946 rsa_key->d_sz = raw_key.d_sz; 947 rsa_key->e_sz = raw_key.e_sz; 948 rsa_key->n_sz = raw_key.n_sz; 949 950 memcpy(rsa_key->d, raw_key.d, raw_key.d_sz); 951 memcpy(rsa_key->e, raw_key.e, raw_key.e_sz); 952 953 caam_rsa_set_priv_key_form(ctx, &raw_key); 954 955 return 0; 956 957 err: 958 caam_rsa_free_key(rsa_key); 959 return -ENOMEM; 960 } 961 962 static unsigned int caam_rsa_max_size(struct crypto_akcipher *tfm) 963 { 964 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 965 966 return ctx->key.n_sz; 967 } 968 969 /* Per session pkc's driver context creation function */ 970 static int caam_rsa_init_tfm(struct crypto_akcipher *tfm) 971 { 972 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 973 974 ctx->dev = caam_jr_alloc(); 975 976 if (IS_ERR(ctx->dev)) { 977 pr_err("Job Ring Device allocation for transform failed\n"); 978 return PTR_ERR(ctx->dev); 979 } 980 981 return 0; 982 } 983 984 /* Per session pkc's driver context cleanup function */ 985 static void caam_rsa_exit_tfm(struct crypto_akcipher *tfm) 986 { 987 struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm); 988 struct caam_rsa_key *key = &ctx->key; 989 990 caam_rsa_free_key(key); 991 caam_jr_free(ctx->dev); 992 } 993 994 static struct akcipher_alg caam_rsa = { 995 .encrypt = caam_rsa_enc, 996 .decrypt = caam_rsa_dec, 997 .sign = caam_rsa_dec, 998 .verify = caam_rsa_enc, 999 .set_pub_key = caam_rsa_set_pub_key, 1000 .set_priv_key = caam_rsa_set_priv_key, 1001 .max_size = caam_rsa_max_size, 1002 .init = caam_rsa_init_tfm, 1003 .exit = caam_rsa_exit_tfm, 1004 .reqsize = sizeof(struct caam_rsa_req_ctx), 1005 .base = { 1006 .cra_name = "rsa", 1007 .cra_driver_name = "rsa-caam", 1008 .cra_priority = 3000, 1009 .cra_module = THIS_MODULE, 1010 .cra_ctxsize = sizeof(struct caam_rsa_ctx), 1011 }, 1012 }; 1013 1014 /* Public Key Cryptography module initialization handler */ 1015 static int __init caam_pkc_init(void) 1016 { 1017 struct device_node *dev_node; 1018 struct platform_device *pdev; 1019 struct device *ctrldev; 1020 struct caam_drv_private *priv; 1021 u32 pk_inst; 1022 int err; 1023 1024 dev_node = of_find_compatible_node(NULL, NULL, "fsl,sec-v4.0"); 1025 if (!dev_node) { 1026 dev_node = of_find_compatible_node(NULL, NULL, "fsl,sec4.0"); 1027 if (!dev_node) 1028 return -ENODEV; 1029 } 1030 1031 pdev = of_find_device_by_node(dev_node); 1032 if (!pdev) { 1033 of_node_put(dev_node); 1034 return -ENODEV; 1035 } 1036 1037 ctrldev = &pdev->dev; 1038 priv = dev_get_drvdata(ctrldev); 1039 of_node_put(dev_node); 1040 1041 /* 1042 * If priv is NULL, it's probably because the caam driver wasn't 1043 * properly initialized (e.g. RNG4 init failed). Thus, bail out here. 1044 */ 1045 if (!priv) { 1046 err = -ENODEV; 1047 goto out_put_dev; 1048 } 1049 1050 /* Determine public key hardware accelerator presence. */ 1051 if (priv->era < 10) 1052 pk_inst = (rd_reg32(&priv->ctrl->perfmon.cha_num_ls) & 1053 CHA_ID_LS_PK_MASK) >> CHA_ID_LS_PK_SHIFT; 1054 else 1055 pk_inst = rd_reg32(&priv->ctrl->vreg.pkha) & CHA_VER_NUM_MASK; 1056 1057 /* Do not register algorithms if PKHA is not present. */ 1058 if (!pk_inst) { 1059 err = -ENODEV; 1060 goto out_put_dev; 1061 } 1062 1063 err = crypto_register_akcipher(&caam_rsa); 1064 if (err) 1065 dev_warn(ctrldev, "%s alg registration failed\n", 1066 caam_rsa.base.cra_driver_name); 1067 else 1068 dev_info(ctrldev, "caam pkc algorithms registered in /proc/crypto\n"); 1069 1070 out_put_dev: 1071 put_device(ctrldev); 1072 return err; 1073 } 1074 1075 static void __exit caam_pkc_exit(void) 1076 { 1077 crypto_unregister_akcipher(&caam_rsa); 1078 } 1079 1080 module_init(caam_pkc_init); 1081 module_exit(caam_pkc_exit); 1082 1083 MODULE_LICENSE("Dual BSD/GPL"); 1084 MODULE_DESCRIPTION("FSL CAAM support for PKC functions of crypto API"); 1085 MODULE_AUTHOR("Freescale Semiconductor"); 1086