drivers/crypto/caam/caampkc.c

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This source file includes following definitions.
rsa_io_unmap
rsa_pub_unmap
rsa_priv_f1_unmap
rsa_priv_f2_unmap
rsa_priv_f3_unmap
rsa_pub_done
rsa_priv_f1_done
rsa_priv_f2_done
rsa_priv_f3_done
caam_rsa_count_leading_zeros
rsa_edesc_alloc
set_rsa_pub_pdb
set_rsa_priv_f1_pdb
set_rsa_priv_f2_pdb
set_rsa_priv_f3_pdb
caam_rsa_enc
caam_rsa_dec_priv_f1
caam_rsa_dec_priv_f2
caam_rsa_dec_priv_f3
caam_rsa_dec
caam_rsa_free_key
caam_rsa_drop_leading_zeros
caam_read_rsa_crt
caam_read_raw_data
caam_rsa_check_key_length
caam_rsa_set_pub_key
caam_rsa_set_priv_key_form
caam_rsa_set_priv_key
caam_rsa_max_size
caam_rsa_init_tfm
caam_rsa_exit_tfm
caam_pkc_init
caam_pkc_exit
   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 */
  30 static u8 *zero_buffer;
  31 
  32 /*
  33  * variable used to avoid double free of resources in case
  34  * algorithm registration was unsuccessful
  35  */
  36 static bool init_done;
  37 
  38 struct caam_akcipher_alg {
  39         struct akcipher_alg akcipher;
  40         bool registered;
  41 };
  42 
  43 static 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 
  56 static 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 
  68 static 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 
  80 static 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 
  97 static 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 */
 117 static void rsa_pub_done(struct device *dev, u32 *desc, u32 err, void *context)
 118 {
 119         struct akcipher_request *req = context;
 120         struct rsa_edesc *edesc;
 121         int ecode = 0;
 122 
 123         if (err)
 124                 ecode = caam_jr_strstatus(dev, err);
 125 
 126         edesc = container_of(desc, struct rsa_edesc, hw_desc[0]);
 127 
 128         rsa_pub_unmap(dev, edesc, req);
 129         rsa_io_unmap(dev, edesc, req);
 130         kfree(edesc);
 131 
 132         akcipher_request_complete(req, ecode);
 133 }
 134 
 135 static void rsa_priv_f1_done(struct device *dev, u32 *desc, u32 err,
 136                              void *context)
 137 {
 138         struct akcipher_request *req = context;
 139         struct rsa_edesc *edesc;
 140         int ecode = 0;
 141 
 142         if (err)
 143                 ecode = caam_jr_strstatus(dev, err);
 144 
 145         edesc = container_of(desc, struct rsa_edesc, hw_desc[0]);
 146 
 147         rsa_priv_f1_unmap(dev, edesc, req);
 148         rsa_io_unmap(dev, edesc, req);
 149         kfree(edesc);
 150 
 151         akcipher_request_complete(req, ecode);
 152 }
 153 
 154 static void rsa_priv_f2_done(struct device *dev, u32 *desc, u32 err,
 155                              void *context)
 156 {
 157         struct akcipher_request *req = context;
 158         struct rsa_edesc *edesc;
 159         int ecode = 0;
 160 
 161         if (err)
 162                 ecode = caam_jr_strstatus(dev, err);
 163 
 164         edesc = container_of(desc, struct rsa_edesc, hw_desc[0]);
 165 
 166         rsa_priv_f2_unmap(dev, edesc, req);
 167         rsa_io_unmap(dev, edesc, req);
 168         kfree(edesc);
 169 
 170         akcipher_request_complete(req, ecode);
 171 }
 172 
 173 static void rsa_priv_f3_done(struct device *dev, u32 *desc, u32 err,
 174                              void *context)
 175 {
 176         struct akcipher_request *req = context;
 177         struct rsa_edesc *edesc;
 178         int ecode = 0;
 179 
 180         if (err)
 181                 ecode = caam_jr_strstatus(dev, err);
 182 
 183         edesc = container_of(desc, struct rsa_edesc, hw_desc[0]);
 184 
 185         rsa_priv_f3_unmap(dev, edesc, req);
 186         rsa_io_unmap(dev, edesc, req);
 187         kfree(edesc);
 188 
 189         akcipher_request_complete(req, ecode);
 190 }
 191 
 192 /**
 193  * Count leading zeros, need it to strip, from a given scatterlist
 194  *
 195  * @sgl   : scatterlist to count zeros from
 196  * @nbytes: number of zeros, in bytes, to strip
 197  * @flags : operation flags
 198  */
 199 static int caam_rsa_count_leading_zeros(struct scatterlist *sgl,
 200                                         unsigned int nbytes,
 201                                         unsigned int flags)
 202 {
 203         struct sg_mapping_iter miter;
 204         int lzeros, ents;
 205         unsigned int len;
 206         unsigned int tbytes = nbytes;
 207         const u8 *buff;
 208 
 209         ents = sg_nents_for_len(sgl, nbytes);
 210         if (ents < 0)
 211                 return ents;
 212 
 213         sg_miter_start(&miter, sgl, ents, SG_MITER_FROM_SG | flags);
 214 
 215         lzeros = 0;
 216         len = 0;
 217         while (nbytes > 0) {
 218                 /* do not strip more than given bytes */
 219                 while (len && !*buff && lzeros < nbytes) {
 220                         lzeros++;
 221                         len--;
 222                         buff++;
 223                 }
 224 
 225                 if (len && *buff)
 226                         break;
 227 
 228                 sg_miter_next(&miter);
 229                 buff = miter.addr;
 230                 len = miter.length;
 231 
 232                 nbytes -= lzeros;
 233                 lzeros = 0;
 234         }
 235 
 236         miter.consumed = lzeros;
 237         sg_miter_stop(&miter);
 238         nbytes -= lzeros;
 239 
 240         return tbytes - nbytes;
 241 }
 242 
 243 static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req,
 244                                          size_t desclen)
 245 {
 246         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 247         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 248         struct device *dev = ctx->dev;
 249         struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 250         struct caam_rsa_key *key = &ctx->key;
 251         struct rsa_edesc *edesc;
 252         gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
 253                        GFP_KERNEL : GFP_ATOMIC;
 254         int sg_flags = (flags == GFP_ATOMIC) ? SG_MITER_ATOMIC : 0;
 255         int sgc;
 256         int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes;
 257         int src_nents, dst_nents;
 258         unsigned int diff_size = 0;
 259         int lzeros;
 260 
 261         if (req->src_len > key->n_sz) {
 262                 /*
 263                  * strip leading zeros and
 264                  * return the number of zeros to skip
 265                  */
 266                 lzeros = caam_rsa_count_leading_zeros(req->src, req->src_len -
 267                                                       key->n_sz, sg_flags);
 268                 if (lzeros < 0)
 269                         return ERR_PTR(lzeros);
 270 
 271                 req_ctx->fixup_src = scatterwalk_ffwd(req_ctx->src, req->src,
 272                                                       lzeros);
 273                 req_ctx->fixup_src_len = req->src_len - lzeros;
 274         } else {
 275                 /*
 276                  * input src is less then n key modulus,
 277                  * so there will be zero padding
 278                  */
 279                 diff_size = key->n_sz - req->src_len;
 280                 req_ctx->fixup_src = req->src;
 281                 req_ctx->fixup_src_len = req->src_len;
 282         }
 283 
 284         src_nents = sg_nents_for_len(req_ctx->fixup_src,
 285                                      req_ctx->fixup_src_len);
 286         dst_nents = sg_nents_for_len(req->dst, req->dst_len);
 287 
 288         if (!diff_size && src_nents == 1)
 289                 sec4_sg_len = 0; /* no need for an input hw s/g table */
 290         else
 291                 sec4_sg_len = src_nents + !!diff_size;
 292         sec4_sg_index = sec4_sg_len;
 293         if (dst_nents > 1)
 294                 sec4_sg_len += pad_sg_nents(dst_nents);
 295         else
 296                 sec4_sg_len = pad_sg_nents(sec4_sg_len);
 297 
 298         sec4_sg_bytes = sec4_sg_len * sizeof(struct sec4_sg_entry);
 299 
 300         /* allocate space for base edesc, hw desc commands and link tables */
 301         edesc = kzalloc(sizeof(*edesc) + desclen + sec4_sg_bytes,
 302                         GFP_DMA | flags);
 303         if (!edesc)
 304                 return ERR_PTR(-ENOMEM);
 305 
 306         sgc = dma_map_sg(dev, req_ctx->fixup_src, src_nents, DMA_TO_DEVICE);
 307         if (unlikely(!sgc)) {
 308                 dev_err(dev, "unable to map source\n");
 309                 goto src_fail;
 310         }
 311 
 312         sgc = dma_map_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE);
 313         if (unlikely(!sgc)) {
 314                 dev_err(dev, "unable to map destination\n");
 315                 goto dst_fail;
 316         }
 317 
 318         edesc->sec4_sg = (void *)edesc + sizeof(*edesc) + desclen;
 319         if (diff_size)
 320                 dma_to_sec4_sg_one(edesc->sec4_sg, ctx->padding_dma, diff_size,
 321                                    0);
 322 
 323         if (sec4_sg_index)
 324                 sg_to_sec4_sg_last(req_ctx->fixup_src, req_ctx->fixup_src_len,
 325                                    edesc->sec4_sg + !!diff_size, 0);
 326 
 327         if (dst_nents > 1)
 328                 sg_to_sec4_sg_last(req->dst, req->dst_len,
 329                                    edesc->sec4_sg + sec4_sg_index, 0);
 330 
 331         /* Save nents for later use in Job Descriptor */
 332         edesc->src_nents = src_nents;
 333         edesc->dst_nents = dst_nents;
 334 
 335         if (!sec4_sg_bytes)
 336                 return edesc;
 337 
 338         edesc->sec4_sg_dma = dma_map_single(dev, edesc->sec4_sg,
 339                                             sec4_sg_bytes, DMA_TO_DEVICE);
 340         if (dma_mapping_error(dev, edesc->sec4_sg_dma)) {
 341                 dev_err(dev, "unable to map S/G table\n");
 342                 goto sec4_sg_fail;
 343         }
 344 
 345         edesc->sec4_sg_bytes = sec4_sg_bytes;
 346 
 347         print_hex_dump_debug("caampkc sec4_sg@" __stringify(__LINE__) ": ",
 348                              DUMP_PREFIX_ADDRESS, 16, 4, edesc->sec4_sg,
 349                              edesc->sec4_sg_bytes, 1);
 350 
 351         return edesc;
 352 
 353 sec4_sg_fail:
 354         dma_unmap_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE);
 355 dst_fail:
 356         dma_unmap_sg(dev, req_ctx->fixup_src, src_nents, DMA_TO_DEVICE);
 357 src_fail:
 358         kfree(edesc);
 359         return ERR_PTR(-ENOMEM);
 360 }
 361 
 362 static int set_rsa_pub_pdb(struct akcipher_request *req,
 363                            struct rsa_edesc *edesc)
 364 {
 365         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 366         struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 367         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 368         struct caam_rsa_key *key = &ctx->key;
 369         struct device *dev = ctx->dev;
 370         struct rsa_pub_pdb *pdb = &edesc->pdb.pub;
 371         int sec4_sg_index = 0;
 372 
 373         pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE);
 374         if (dma_mapping_error(dev, pdb->n_dma)) {
 375                 dev_err(dev, "Unable to map RSA modulus memory\n");
 376                 return -ENOMEM;
 377         }
 378 
 379         pdb->e_dma = dma_map_single(dev, key->e, key->e_sz, DMA_TO_DEVICE);
 380         if (dma_mapping_error(dev, pdb->e_dma)) {
 381                 dev_err(dev, "Unable to map RSA public exponent memory\n");
 382                 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
 383                 return -ENOMEM;
 384         }
 385 
 386         if (edesc->src_nents > 1) {
 387                 pdb->sgf |= RSA_PDB_SGF_F;
 388                 pdb->f_dma = edesc->sec4_sg_dma;
 389                 sec4_sg_index += edesc->src_nents;
 390         } else {
 391                 pdb->f_dma = sg_dma_address(req_ctx->fixup_src);
 392         }
 393 
 394         if (edesc->dst_nents > 1) {
 395                 pdb->sgf |= RSA_PDB_SGF_G;
 396                 pdb->g_dma = edesc->sec4_sg_dma +
 397                              sec4_sg_index * sizeof(struct sec4_sg_entry);
 398         } else {
 399                 pdb->g_dma = sg_dma_address(req->dst);
 400         }
 401 
 402         pdb->sgf |= (key->e_sz << RSA_PDB_E_SHIFT) | key->n_sz;
 403         pdb->f_len = req_ctx->fixup_src_len;
 404 
 405         return 0;
 406 }
 407 
 408 static int set_rsa_priv_f1_pdb(struct akcipher_request *req,
 409                                struct rsa_edesc *edesc)
 410 {
 411         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 412         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 413         struct caam_rsa_key *key = &ctx->key;
 414         struct device *dev = ctx->dev;
 415         struct rsa_priv_f1_pdb *pdb = &edesc->pdb.priv_f1;
 416         int sec4_sg_index = 0;
 417 
 418         pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE);
 419         if (dma_mapping_error(dev, pdb->n_dma)) {
 420                 dev_err(dev, "Unable to map modulus memory\n");
 421                 return -ENOMEM;
 422         }
 423 
 424         pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE);
 425         if (dma_mapping_error(dev, pdb->d_dma)) {
 426                 dev_err(dev, "Unable to map RSA private exponent memory\n");
 427                 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
 428                 return -ENOMEM;
 429         }
 430 
 431         if (edesc->src_nents > 1) {
 432                 pdb->sgf |= RSA_PRIV_PDB_SGF_G;
 433                 pdb->g_dma = edesc->sec4_sg_dma;
 434                 sec4_sg_index += edesc->src_nents;
 435         } else {
 436                 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 437 
 438                 pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
 439         }
 440 
 441         if (edesc->dst_nents > 1) {
 442                 pdb->sgf |= RSA_PRIV_PDB_SGF_F;
 443                 pdb->f_dma = edesc->sec4_sg_dma +
 444                              sec4_sg_index * sizeof(struct sec4_sg_entry);
 445         } else {
 446                 pdb->f_dma = sg_dma_address(req->dst);
 447         }
 448 
 449         pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz;
 450 
 451         return 0;
 452 }
 453 
 454 static int set_rsa_priv_f2_pdb(struct akcipher_request *req,
 455                                struct rsa_edesc *edesc)
 456 {
 457         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 458         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 459         struct caam_rsa_key *key = &ctx->key;
 460         struct device *dev = ctx->dev;
 461         struct rsa_priv_f2_pdb *pdb = &edesc->pdb.priv_f2;
 462         int sec4_sg_index = 0;
 463         size_t p_sz = key->p_sz;
 464         size_t q_sz = key->q_sz;
 465 
 466         pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE);
 467         if (dma_mapping_error(dev, pdb->d_dma)) {
 468                 dev_err(dev, "Unable to map RSA private exponent memory\n");
 469                 return -ENOMEM;
 470         }
 471 
 472         pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE);
 473         if (dma_mapping_error(dev, pdb->p_dma)) {
 474                 dev_err(dev, "Unable to map RSA prime factor p memory\n");
 475                 goto unmap_d;
 476         }
 477 
 478         pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE);
 479         if (dma_mapping_error(dev, pdb->q_dma)) {
 480                 dev_err(dev, "Unable to map RSA prime factor q memory\n");
 481                 goto unmap_p;
 482         }
 483 
 484         pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL);
 485         if (dma_mapping_error(dev, pdb->tmp1_dma)) {
 486                 dev_err(dev, "Unable to map RSA tmp1 memory\n");
 487                 goto unmap_q;
 488         }
 489 
 490         pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL);
 491         if (dma_mapping_error(dev, pdb->tmp2_dma)) {
 492                 dev_err(dev, "Unable to map RSA tmp2 memory\n");
 493                 goto unmap_tmp1;
 494         }
 495 
 496         if (edesc->src_nents > 1) {
 497                 pdb->sgf |= RSA_PRIV_PDB_SGF_G;
 498                 pdb->g_dma = edesc->sec4_sg_dma;
 499                 sec4_sg_index += edesc->src_nents;
 500         } else {
 501                 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 502 
 503                 pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
 504         }
 505 
 506         if (edesc->dst_nents > 1) {
 507                 pdb->sgf |= RSA_PRIV_PDB_SGF_F;
 508                 pdb->f_dma = edesc->sec4_sg_dma +
 509                              sec4_sg_index * sizeof(struct sec4_sg_entry);
 510         } else {
 511                 pdb->f_dma = sg_dma_address(req->dst);
 512         }
 513 
 514         pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz;
 515         pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz;
 516 
 517         return 0;
 518 
 519 unmap_tmp1:
 520         dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
 521 unmap_q:
 522         dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
 523 unmap_p:
 524         dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
 525 unmap_d:
 526         dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
 527 
 528         return -ENOMEM;
 529 }
 530 
 531 static int set_rsa_priv_f3_pdb(struct akcipher_request *req,
 532                                struct rsa_edesc *edesc)
 533 {
 534         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 535         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 536         struct caam_rsa_key *key = &ctx->key;
 537         struct device *dev = ctx->dev;
 538         struct rsa_priv_f3_pdb *pdb = &edesc->pdb.priv_f3;
 539         int sec4_sg_index = 0;
 540         size_t p_sz = key->p_sz;
 541         size_t q_sz = key->q_sz;
 542 
 543         pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE);
 544         if (dma_mapping_error(dev, pdb->p_dma)) {
 545                 dev_err(dev, "Unable to map RSA prime factor p memory\n");
 546                 return -ENOMEM;
 547         }
 548 
 549         pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE);
 550         if (dma_mapping_error(dev, pdb->q_dma)) {
 551                 dev_err(dev, "Unable to map RSA prime factor q memory\n");
 552                 goto unmap_p;
 553         }
 554 
 555         pdb->dp_dma = dma_map_single(dev, key->dp, p_sz, DMA_TO_DEVICE);
 556         if (dma_mapping_error(dev, pdb->dp_dma)) {
 557                 dev_err(dev, "Unable to map RSA exponent dp memory\n");
 558                 goto unmap_q;
 559         }
 560 
 561         pdb->dq_dma = dma_map_single(dev, key->dq, q_sz, DMA_TO_DEVICE);
 562         if (dma_mapping_error(dev, pdb->dq_dma)) {
 563                 dev_err(dev, "Unable to map RSA exponent dq memory\n");
 564                 goto unmap_dp;
 565         }
 566 
 567         pdb->c_dma = dma_map_single(dev, key->qinv, p_sz, DMA_TO_DEVICE);
 568         if (dma_mapping_error(dev, pdb->c_dma)) {
 569                 dev_err(dev, "Unable to map RSA CRT coefficient qinv memory\n");
 570                 goto unmap_dq;
 571         }
 572 
 573         pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL);
 574         if (dma_mapping_error(dev, pdb->tmp1_dma)) {
 575                 dev_err(dev, "Unable to map RSA tmp1 memory\n");
 576                 goto unmap_qinv;
 577         }
 578 
 579         pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL);
 580         if (dma_mapping_error(dev, pdb->tmp2_dma)) {
 581                 dev_err(dev, "Unable to map RSA tmp2 memory\n");
 582                 goto unmap_tmp1;
 583         }
 584 
 585         if (edesc->src_nents > 1) {
 586                 pdb->sgf |= RSA_PRIV_PDB_SGF_G;
 587                 pdb->g_dma = edesc->sec4_sg_dma;
 588                 sec4_sg_index += edesc->src_nents;
 589         } else {
 590                 struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 591 
 592                 pdb->g_dma = sg_dma_address(req_ctx->fixup_src);
 593         }
 594 
 595         if (edesc->dst_nents > 1) {
 596                 pdb->sgf |= RSA_PRIV_PDB_SGF_F;
 597                 pdb->f_dma = edesc->sec4_sg_dma +
 598                              sec4_sg_index * sizeof(struct sec4_sg_entry);
 599         } else {
 600                 pdb->f_dma = sg_dma_address(req->dst);
 601         }
 602 
 603         pdb->sgf |= key->n_sz;
 604         pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz;
 605 
 606         return 0;
 607 
 608 unmap_tmp1:
 609         dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
 610 unmap_qinv:
 611         dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE);
 612 unmap_dq:
 613         dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE);
 614 unmap_dp:
 615         dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE);
 616 unmap_q:
 617         dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
 618 unmap_p:
 619         dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
 620 
 621         return -ENOMEM;
 622 }
 623 
 624 static int caam_rsa_enc(struct akcipher_request *req)
 625 {
 626         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 627         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 628         struct caam_rsa_key *key = &ctx->key;
 629         struct device *jrdev = ctx->dev;
 630         struct rsa_edesc *edesc;
 631         int ret;
 632 
 633         if (unlikely(!key->n || !key->e))
 634                 return -EINVAL;
 635 
 636         if (req->dst_len < key->n_sz) {
 637                 req->dst_len = key->n_sz;
 638                 dev_err(jrdev, "Output buffer length less than parameter n\n");
 639                 return -EOVERFLOW;
 640         }
 641 
 642         /* Allocate extended descriptor */
 643         edesc = rsa_edesc_alloc(req, DESC_RSA_PUB_LEN);
 644         if (IS_ERR(edesc))
 645                 return PTR_ERR(edesc);
 646 
 647         /* Set RSA Encrypt Protocol Data Block */
 648         ret = set_rsa_pub_pdb(req, edesc);
 649         if (ret)
 650                 goto init_fail;
 651 
 652         /* Initialize Job Descriptor */
 653         init_rsa_pub_desc(edesc->hw_desc, &edesc->pdb.pub);
 654 
 655         ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_pub_done, req);
 656         if (!ret)
 657                 return -EINPROGRESS;
 658 
 659         rsa_pub_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_f1(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_F1_LEN);
 677         if (IS_ERR(edesc))
 678                 return PTR_ERR(edesc);
 679 
 680         /* Set RSA Decrypt Protocol Data Block - Private Key Form #1 */
 681         ret = set_rsa_priv_f1_pdb(req, edesc);
 682         if (ret)
 683                 goto init_fail;
 684 
 685         /* Initialize Job Descriptor */
 686         init_rsa_priv_f1_desc(edesc->hw_desc, &edesc->pdb.priv_f1);
 687 
 688         ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f1_done, req);
 689         if (!ret)
 690                 return -EINPROGRESS;
 691 
 692         rsa_priv_f1_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_priv_f2(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 device *jrdev = ctx->dev;
 705         struct rsa_edesc *edesc;
 706         int ret;
 707 
 708         /* Allocate extended descriptor */
 709         edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F2_LEN);
 710         if (IS_ERR(edesc))
 711                 return PTR_ERR(edesc);
 712 
 713         /* Set RSA Decrypt Protocol Data Block - Private Key Form #2 */
 714         ret = set_rsa_priv_f2_pdb(req, edesc);
 715         if (ret)
 716                 goto init_fail;
 717 
 718         /* Initialize Job Descriptor */
 719         init_rsa_priv_f2_desc(edesc->hw_desc, &edesc->pdb.priv_f2);
 720 
 721         ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f2_done, req);
 722         if (!ret)
 723                 return -EINPROGRESS;
 724 
 725         rsa_priv_f2_unmap(jrdev, edesc, req);
 726 
 727 init_fail:
 728         rsa_io_unmap(jrdev, edesc, req);
 729         kfree(edesc);
 730         return ret;
 731 }
 732 
 733 static int caam_rsa_dec_priv_f3(struct akcipher_request *req)
 734 {
 735         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 736         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 737         struct device *jrdev = ctx->dev;
 738         struct rsa_edesc *edesc;
 739         int ret;
 740 
 741         /* Allocate extended descriptor */
 742         edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F3_LEN);
 743         if (IS_ERR(edesc))
 744                 return PTR_ERR(edesc);
 745 
 746         /* Set RSA Decrypt Protocol Data Block - Private Key Form #3 */
 747         ret = set_rsa_priv_f3_pdb(req, edesc);
 748         if (ret)
 749                 goto init_fail;
 750 
 751         /* Initialize Job Descriptor */
 752         init_rsa_priv_f3_desc(edesc->hw_desc, &edesc->pdb.priv_f3);
 753 
 754         ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f3_done, req);
 755         if (!ret)
 756                 return -EINPROGRESS;
 757 
 758         rsa_priv_f3_unmap(jrdev, edesc, req);
 759 
 760 init_fail:
 761         rsa_io_unmap(jrdev, edesc, req);
 762         kfree(edesc);
 763         return ret;
 764 }
 765 
 766 static int caam_rsa_dec(struct akcipher_request *req)
 767 {
 768         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 769         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 770         struct caam_rsa_key *key = &ctx->key;
 771         int ret;
 772 
 773         if (unlikely(!key->n || !key->d))
 774                 return -EINVAL;
 775 
 776         if (req->dst_len < key->n_sz) {
 777                 req->dst_len = key->n_sz;
 778                 dev_err(ctx->dev, "Output buffer length less than parameter n\n");
 779                 return -EOVERFLOW;
 780         }
 781 
 782         if (key->priv_form == FORM3)
 783                 ret = caam_rsa_dec_priv_f3(req);
 784         else if (key->priv_form == FORM2)
 785                 ret = caam_rsa_dec_priv_f2(req);
 786         else
 787                 ret = caam_rsa_dec_priv_f1(req);
 788 
 789         return ret;
 790 }
 791 
 792 static void caam_rsa_free_key(struct caam_rsa_key *key)
 793 {
 794         kzfree(key->d);
 795         kzfree(key->p);
 796         kzfree(key->q);
 797         kzfree(key->dp);
 798         kzfree(key->dq);
 799         kzfree(key->qinv);
 800         kzfree(key->tmp1);
 801         kzfree(key->tmp2);
 802         kfree(key->e);
 803         kfree(key->n);
 804         memset(key, 0, sizeof(*key));
 805 }
 806 
 807 static void caam_rsa_drop_leading_zeros(const u8 **ptr, size_t *nbytes)
 808 {
 809         while (!**ptr && *nbytes) {
 810                 (*ptr)++;
 811                 (*nbytes)--;
 812         }
 813 }
 814 
 815 /**
 816  * caam_read_rsa_crt - Used for reading dP, dQ, qInv CRT members.
 817  * dP, dQ and qInv could decode to less than corresponding p, q length, as the
 818  * BER-encoding requires that the minimum number of bytes be used to encode the
 819  * integer. dP, dQ, qInv decoded values have to be zero-padded to appropriate
 820  * length.
 821  *
 822  * @ptr   : pointer to {dP, dQ, qInv} CRT member
 823  * @nbytes: length in bytes of {dP, dQ, qInv} CRT member
 824  * @dstlen: length in bytes of corresponding p or q prime factor
 825  */
 826 static u8 *caam_read_rsa_crt(const u8 *ptr, size_t nbytes, size_t dstlen)
 827 {
 828         u8 *dst;
 829 
 830         caam_rsa_drop_leading_zeros(&ptr, &nbytes);
 831         if (!nbytes)
 832                 return NULL;
 833 
 834         dst = kzalloc(dstlen, GFP_DMA | GFP_KERNEL);
 835         if (!dst)
 836                 return NULL;
 837 
 838         memcpy(dst + (dstlen - nbytes), ptr, nbytes);
 839 
 840         return dst;
 841 }
 842 
 843 /**
 844  * caam_read_raw_data - Read a raw byte stream as a positive integer.
 845  * The function skips buffer's leading zeros, copies the remained data
 846  * to a buffer allocated in the GFP_DMA | GFP_KERNEL zone and returns
 847  * the address of the new buffer.
 848  *
 849  * @buf   : The data to read
 850  * @nbytes: The amount of data to read
 851  */
 852 static inline u8 *caam_read_raw_data(const u8 *buf, size_t *nbytes)
 853 {
 854 
 855         caam_rsa_drop_leading_zeros(&buf, nbytes);
 856         if (!*nbytes)
 857                 return NULL;
 858 
 859         return kmemdup(buf, *nbytes, GFP_DMA | GFP_KERNEL);
 860 }
 861 
 862 static int caam_rsa_check_key_length(unsigned int len)
 863 {
 864         if (len > 4096)
 865                 return -EINVAL;
 866         return 0;
 867 }
 868 
 869 static int caam_rsa_set_pub_key(struct crypto_akcipher *tfm, const void *key,
 870                                 unsigned int keylen)
 871 {
 872         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 873         struct rsa_key raw_key = {NULL};
 874         struct caam_rsa_key *rsa_key = &ctx->key;
 875         int ret;
 876 
 877         /* Free the old RSA key if any */
 878         caam_rsa_free_key(rsa_key);
 879 
 880         ret = rsa_parse_pub_key(&raw_key, key, keylen);
 881         if (ret)
 882                 return ret;
 883 
 884         /* Copy key in DMA zone */
 885         rsa_key->e = kmemdup(raw_key.e, raw_key.e_sz, GFP_DMA | GFP_KERNEL);
 886         if (!rsa_key->e)
 887                 goto err;
 888 
 889         /*
 890          * Skip leading zeros and copy the positive integer to a buffer
 891          * allocated in the GFP_DMA | GFP_KERNEL zone. The decryption descriptor
 892          * expects a positive integer for the RSA modulus and uses its length as
 893          * decryption output length.
 894          */
 895         rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz);
 896         if (!rsa_key->n)
 897                 goto err;
 898 
 899         if (caam_rsa_check_key_length(raw_key.n_sz << 3)) {
 900                 caam_rsa_free_key(rsa_key);
 901                 return -EINVAL;
 902         }
 903 
 904         rsa_key->e_sz = raw_key.e_sz;
 905         rsa_key->n_sz = raw_key.n_sz;
 906 
 907         return 0;
 908 err:
 909         caam_rsa_free_key(rsa_key);
 910         return -ENOMEM;
 911 }
 912 
 913 static void caam_rsa_set_priv_key_form(struct caam_rsa_ctx *ctx,
 914                                        struct rsa_key *raw_key)
 915 {
 916         struct caam_rsa_key *rsa_key = &ctx->key;
 917         size_t p_sz = raw_key->p_sz;
 918         size_t q_sz = raw_key->q_sz;
 919 
 920         rsa_key->p = caam_read_raw_data(raw_key->p, &p_sz);
 921         if (!rsa_key->p)
 922                 return;
 923         rsa_key->p_sz = p_sz;
 924 
 925         rsa_key->q = caam_read_raw_data(raw_key->q, &q_sz);
 926         if (!rsa_key->q)
 927                 goto free_p;
 928         rsa_key->q_sz = q_sz;
 929 
 930         rsa_key->tmp1 = kzalloc(raw_key->p_sz, GFP_DMA | GFP_KERNEL);
 931         if (!rsa_key->tmp1)
 932                 goto free_q;
 933 
 934         rsa_key->tmp2 = kzalloc(raw_key->q_sz, GFP_DMA | GFP_KERNEL);
 935         if (!rsa_key->tmp2)
 936                 goto free_tmp1;
 937 
 938         rsa_key->priv_form = FORM2;
 939 
 940         rsa_key->dp = caam_read_rsa_crt(raw_key->dp, raw_key->dp_sz, p_sz);
 941         if (!rsa_key->dp)
 942                 goto free_tmp2;
 943 
 944         rsa_key->dq = caam_read_rsa_crt(raw_key->dq, raw_key->dq_sz, q_sz);
 945         if (!rsa_key->dq)
 946                 goto free_dp;
 947 
 948         rsa_key->qinv = caam_read_rsa_crt(raw_key->qinv, raw_key->qinv_sz,
 949                                           q_sz);
 950         if (!rsa_key->qinv)
 951                 goto free_dq;
 952 
 953         rsa_key->priv_form = FORM3;
 954 
 955         return;
 956 
 957 free_dq:
 958         kzfree(rsa_key->dq);
 959 free_dp:
 960         kzfree(rsa_key->dp);
 961 free_tmp2:
 962         kzfree(rsa_key->tmp2);
 963 free_tmp1:
 964         kzfree(rsa_key->tmp1);
 965 free_q:
 966         kzfree(rsa_key->q);
 967 free_p:
 968         kzfree(rsa_key->p);
 969 }
 970 
 971 static int caam_rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key,
 972                                  unsigned int keylen)
 973 {
 974         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 975         struct rsa_key raw_key = {NULL};
 976         struct caam_rsa_key *rsa_key = &ctx->key;
 977         int ret;
 978 
 979         /* Free the old RSA key if any */
 980         caam_rsa_free_key(rsa_key);
 981 
 982         ret = rsa_parse_priv_key(&raw_key, key, keylen);
 983         if (ret)
 984                 return ret;
 985 
 986         /* Copy key in DMA zone */
 987         rsa_key->d = kmemdup(raw_key.d, raw_key.d_sz, GFP_DMA | GFP_KERNEL);
 988         if (!rsa_key->d)
 989                 goto err;
 990 
 991         rsa_key->e = kmemdup(raw_key.e, raw_key.e_sz, GFP_DMA | GFP_KERNEL);
 992         if (!rsa_key->e)
 993                 goto err;
 994 
 995         /*
 996          * Skip leading zeros and copy the positive integer to a buffer
 997          * allocated in the GFP_DMA | GFP_KERNEL zone. The decryption descriptor
 998          * expects a positive integer for the RSA modulus and uses its length as
 999          * decryption output length.
1000          */
1001         rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz);
1002         if (!rsa_key->n)
1003                 goto err;
1004 
1005         if (caam_rsa_check_key_length(raw_key.n_sz << 3)) {
1006                 caam_rsa_free_key(rsa_key);
1007                 return -EINVAL;
1008         }
1009 
1010         rsa_key->d_sz = raw_key.d_sz;
1011         rsa_key->e_sz = raw_key.e_sz;
1012         rsa_key->n_sz = raw_key.n_sz;
1013 
1014         caam_rsa_set_priv_key_form(ctx, &raw_key);
1015 
1016         return 0;
1017 
1018 err:
1019         caam_rsa_free_key(rsa_key);
1020         return -ENOMEM;
1021 }
1022 
1023 static unsigned int caam_rsa_max_size(struct crypto_akcipher *tfm)
1024 {
1025         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
1026 
1027         return ctx->key.n_sz;
1028 }
1029 
1030 /* Per session pkc's driver context creation function */
1031 static int caam_rsa_init_tfm(struct crypto_akcipher *tfm)
1032 {
1033         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
1034 
1035         ctx->dev = caam_jr_alloc();
1036 
1037         if (IS_ERR(ctx->dev)) {
1038                 pr_err("Job Ring Device allocation for transform failed\n");
1039                 return PTR_ERR(ctx->dev);
1040         }
1041 
1042         ctx->padding_dma = dma_map_single(ctx->dev, zero_buffer,
1043                                           CAAM_RSA_MAX_INPUT_SIZE - 1,
1044                                           DMA_TO_DEVICE);
1045         if (dma_mapping_error(ctx->dev, ctx->padding_dma)) {
1046                 dev_err(ctx->dev, "unable to map padding\n");
1047                 caam_jr_free(ctx->dev);
1048                 return -ENOMEM;
1049         }
1050 
1051         return 0;
1052 }
1053 
1054 /* Per session pkc's driver context cleanup function */
1055 static void caam_rsa_exit_tfm(struct crypto_akcipher *tfm)
1056 {
1057         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
1058         struct caam_rsa_key *key = &ctx->key;
1059 
1060         dma_unmap_single(ctx->dev, ctx->padding_dma, CAAM_RSA_MAX_INPUT_SIZE -
1061                          1, DMA_TO_DEVICE);
1062         caam_rsa_free_key(key);
1063         caam_jr_free(ctx->dev);
1064 }
1065 
1066 static struct caam_akcipher_alg caam_rsa = {
1067         .akcipher = {
1068                 .encrypt = caam_rsa_enc,
1069                 .decrypt = caam_rsa_dec,
1070                 .set_pub_key = caam_rsa_set_pub_key,
1071                 .set_priv_key = caam_rsa_set_priv_key,
1072                 .max_size = caam_rsa_max_size,
1073                 .init = caam_rsa_init_tfm,
1074                 .exit = caam_rsa_exit_tfm,
1075                 .reqsize = sizeof(struct caam_rsa_req_ctx),
1076                 .base = {
1077                         .cra_name = "rsa",
1078                         .cra_driver_name = "rsa-caam",
1079                         .cra_priority = 3000,
1080                         .cra_module = THIS_MODULE,
1081                         .cra_ctxsize = sizeof(struct caam_rsa_ctx),
1082                 },
1083         }
1084 };
1085 
1086 /* Public Key Cryptography module initialization handler */
1087 int caam_pkc_init(struct device *ctrldev)
1088 {
1089         struct caam_drv_private *priv = dev_get_drvdata(ctrldev);
1090         u32 pk_inst;
1091         int err;
1092         init_done = false;
1093 
1094         /* Determine public key hardware accelerator presence. */
1095         if (priv->era < 10)
1096                 pk_inst = (rd_reg32(&priv->ctrl->perfmon.cha_num_ls) &
1097                            CHA_ID_LS_PK_MASK) >> CHA_ID_LS_PK_SHIFT;
1098         else
1099                 pk_inst = rd_reg32(&priv->ctrl->vreg.pkha) & CHA_VER_NUM_MASK;
1100 
1101         /* Do not register algorithms if PKHA is not present. */
1102         if (!pk_inst)
1103                 return 0;
1104 
1105         /* allocate zero buffer, used for padding input */
1106         zero_buffer = kzalloc(CAAM_RSA_MAX_INPUT_SIZE - 1, GFP_DMA |
1107                               GFP_KERNEL);
1108         if (!zero_buffer)
1109                 return -ENOMEM;
1110 
1111         err = crypto_register_akcipher(&caam_rsa.akcipher);
1112 
1113         if (err) {
1114                 kfree(zero_buffer);
1115                 dev_warn(ctrldev, "%s alg registration failed\n",
1116                          caam_rsa.akcipher.base.cra_driver_name);
1117         } else {
1118                 init_done = true;
1119                 caam_rsa.registered = true;
1120                 dev_info(ctrldev, "caam pkc algorithms registered in /proc/crypto\n");
1121         }
1122 
1123         return err;
1124 }
1125 
1126 void caam_pkc_exit(void)
1127 {
1128         if (!init_done)
1129                 return;
1130 
1131         if (caam_rsa.registered)
1132                 crypto_unregister_akcipher(&caam_rsa.akcipher);
1133 
1134         kfree(zero_buffer);
1135 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/crypto/caam/caampkc.c

DEFINITIONS
