drivers/crypto/caam/caampkc.c

   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         .set_pub_key = caam_rsa_set_pub_key,
 998         .set_priv_key = caam_rsa_set_priv_key,
 999         .max_size = caam_rsa_max_size,
1000         .init = caam_rsa_init_tfm,
1001         .exit = caam_rsa_exit_tfm,
1002         .reqsize = sizeof(struct caam_rsa_req_ctx),
1003         .base = {
1004                 .cra_name = "rsa",
1005                 .cra_driver_name = "rsa-caam",
1006                 .cra_priority = 3000,
1007                 .cra_module = THIS_MODULE,
1008                 .cra_ctxsize = sizeof(struct caam_rsa_ctx),
1009         },
1010 };
1011
1012 /* Public Key Cryptography module initialization handler */
1013 static int __init caam_pkc_init(void)
1014 {
1015         struct device_node *dev_node;
1016         struct platform_device *pdev;
1017         struct device *ctrldev;
1018         struct caam_drv_private *priv;
1019         u32 pk_inst;
1020         int err;
1021
1022         dev_node = of_find_compatible_node(NULL, NULL, "fsl,sec-v4.0");
1023         if (!dev_node) {
1024                 dev_node = of_find_compatible_node(NULL, NULL, "fsl,sec4.0");
1025                 if (!dev_node)
1026                         return -ENODEV;
1027         }
1028
1029         pdev = of_find_device_by_node(dev_node);
1030         if (!pdev) {
1031                 of_node_put(dev_node);
1032                 return -ENODEV;
1033         }
1034
1035         ctrldev = &pdev->dev;
1036         priv = dev_get_drvdata(ctrldev);
1037         of_node_put(dev_node);
1038
1039         /*
1040          * If priv is NULL, it's probably because the caam driver wasn't
1041          * properly initialized (e.g. RNG4 init failed). Thus, bail out here.
1042          */
1043         if (!priv) {
1044                 err = -ENODEV;
1045                 goto out_put_dev;
1046         }
1047
1048         /* Determine public key hardware accelerator presence. */
1049         if (priv->era < 10)
1050                 pk_inst = (rd_reg32(&priv->ctrl->perfmon.cha_num_ls) &
1051                            CHA_ID_LS_PK_MASK) >> CHA_ID_LS_PK_SHIFT;
1052         else
1053                 pk_inst = rd_reg32(&priv->ctrl->vreg.pkha) & CHA_VER_NUM_MASK;
1054
1055         /* Do not register algorithms if PKHA is not present. */
1056         if (!pk_inst) {
1057                 err =  -ENODEV;
1058                 goto out_put_dev;
1059         }
1060
1061         err = crypto_register_akcipher(&caam_rsa);
1062         if (err)
1063                 dev_warn(ctrldev, "%s alg registration failed\n",
1064                          caam_rsa.base.cra_driver_name);
1065         else
1066                 dev_info(ctrldev, "caam pkc algorithms registered in /proc/crypto\n");
1067
1068 out_put_dev:
1069         put_device(ctrldev);
1070         return err;
1071 }
1072
1073 static void __exit caam_pkc_exit(void)
1074 {
1075         crypto_unregister_akcipher(&caam_rsa);
1076 }
1077
1078 module_init(caam_pkc_init);
1079 module_exit(caam_pkc_exit);
1080
1081 MODULE_LICENSE("Dual BSD/GPL");
1082 MODULE_DESCRIPTION("FSL CAAM support for PKC functions of crypto API");
1083 MODULE_AUTHOR("Freescale Semiconductor");