drivers/crypto/caam/caampkc.c

   1 /*
   2  * caam - Freescale FSL CAAM support for Public Key Cryptography
   3  *
   4  * Copyright 2016 Freescale Semiconductor, Inc.
   5  *
   6  * There is no Shared Descriptor for PKC so that the Job Descriptor must carry
   7  * all the desired key parameters, input and output pointers.
   8  */
   9 #include "compat.h"
  10 #include "regs.h"
  11 #include "intern.h"
  12 #include "jr.h"
  13 #include "error.h"
  14 #include "desc_constr.h"
  15 #include "sg_sw_sec4.h"
  16 #include "caampkc.h"
  17
  18 #define DESC_RSA_PUB_LEN        (2 * CAAM_CMD_SZ + sizeof(struct rsa_pub_pdb))
  19 #define DESC_RSA_PRIV_F1_LEN    (2 * CAAM_CMD_SZ + \
  20                                  sizeof(struct rsa_priv_f1_pdb))
  21 #define DESC_RSA_PRIV_F2_LEN    (2 * CAAM_CMD_SZ + \
  22                                  sizeof(struct rsa_priv_f2_pdb))
  23 #define DESC_RSA_PRIV_F3_LEN    (2 * CAAM_CMD_SZ + \
  24                                  sizeof(struct rsa_priv_f3_pdb))
  25
  26 static void rsa_io_unmap(struct device *dev, struct rsa_edesc *edesc,
  27                          struct akcipher_request *req)
  28 {
  29         dma_unmap_sg(dev, req->dst, edesc->dst_nents, DMA_FROM_DEVICE);
  30         dma_unmap_sg(dev, req->src, edesc->src_nents, DMA_TO_DEVICE);
  31
  32         if (edesc->sec4_sg_bytes)
  33                 dma_unmap_single(dev, edesc->sec4_sg_dma, edesc->sec4_sg_bytes,
  34                                  DMA_TO_DEVICE);
  35 }
  36
  37 static void rsa_pub_unmap(struct device *dev, struct rsa_edesc *edesc,
  38                           struct akcipher_request *req)
  39 {
  40         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
  41         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
  42         struct caam_rsa_key *key = &ctx->key;
  43         struct rsa_pub_pdb *pdb = &edesc->pdb.pub;
  44
  45         dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
  46         dma_unmap_single(dev, pdb->e_dma, key->e_sz, DMA_TO_DEVICE);
  47 }
  48
  49 static void rsa_priv_f1_unmap(struct device *dev, struct rsa_edesc *edesc,
  50                               struct akcipher_request *req)
  51 {
  52         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
  53         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
  54         struct caam_rsa_key *key = &ctx->key;
  55         struct rsa_priv_f1_pdb *pdb = &edesc->pdb.priv_f1;
  56
  57         dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
  58         dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
  59 }
  60
  61 static void rsa_priv_f2_unmap(struct device *dev, struct rsa_edesc *edesc,
  62                               struct akcipher_request *req)
  63 {
  64         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
  65         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
  66         struct caam_rsa_key *key = &ctx->key;
  67         struct rsa_priv_f2_pdb *pdb = &edesc->pdb.priv_f2;
  68         size_t p_sz = key->p_sz;
  69         size_t q_sz = key->q_sz;
  70
  71         dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
  72         dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
  73         dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
  74         dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
  75         dma_unmap_single(dev, pdb->tmp2_dma, q_sz, DMA_BIDIRECTIONAL);
  76 }
  77
  78 static void rsa_priv_f3_unmap(struct device *dev, struct rsa_edesc *edesc,
  79                               struct akcipher_request *req)
  80 {
  81         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
  82         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
  83         struct caam_rsa_key *key = &ctx->key;
  84         struct rsa_priv_f3_pdb *pdb = &edesc->pdb.priv_f3;
  85         size_t p_sz = key->p_sz;
  86         size_t q_sz = key->q_sz;
  87
  88         dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
  89         dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
  90         dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE);
  91         dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE);
  92         dma_unmap_single(dev, pdb->c_dma, p_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 /* RSA Job Completion handler */
  98 static void rsa_pub_done(struct device *dev, u32 *desc, u32 err, void *context)
  99 {
 100         struct akcipher_request *req = context;
 101         struct rsa_edesc *edesc;
 102
 103         if (err)
 104                 caam_jr_strstatus(dev, err);
 105
 106         edesc = container_of(desc, struct rsa_edesc, hw_desc[0]);
 107
 108         rsa_pub_unmap(dev, edesc, req);
 109         rsa_io_unmap(dev, edesc, req);
 110         kfree(edesc);
 111
 112         akcipher_request_complete(req, err);
 113 }
 114
 115 static void rsa_priv_f1_done(struct device *dev, u32 *desc, u32 err,
 116                              void *context)
 117 {
 118         struct akcipher_request *req = context;
 119         struct rsa_edesc *edesc;
 120
 121         if (err)
 122                 caam_jr_strstatus(dev, err);
 123
 124         edesc = container_of(desc, struct rsa_edesc, hw_desc[0]);
 125
 126         rsa_priv_f1_unmap(dev, edesc, req);
 127         rsa_io_unmap(dev, edesc, req);
 128         kfree(edesc);
 129
 130         akcipher_request_complete(req, err);
 131 }
 132
 133 static void rsa_priv_f2_done(struct device *dev, u32 *desc, u32 err,
 134                              void *context)
 135 {
 136         struct akcipher_request *req = context;
 137         struct rsa_edesc *edesc;
 138
 139         if (err)
 140                 caam_jr_strstatus(dev, err);
 141
 142         edesc = container_of(desc, struct rsa_edesc, hw_desc[0]);
 143
 144         rsa_priv_f2_unmap(dev, edesc, req);
 145         rsa_io_unmap(dev, edesc, req);
 146         kfree(edesc);
 147
 148         akcipher_request_complete(req, err);
 149 }
 150
 151 static void rsa_priv_f3_done(struct device *dev, u32 *desc, u32 err,
 152                              void *context)
 153 {
 154         struct akcipher_request *req = context;
 155         struct rsa_edesc *edesc;
 156
 157         if (err)
 158                 caam_jr_strstatus(dev, err);
 159
 160         edesc = container_of(desc, struct rsa_edesc, hw_desc[0]);
 161
 162         rsa_priv_f3_unmap(dev, edesc, req);
 163         rsa_io_unmap(dev, edesc, req);
 164         kfree(edesc);
 165
 166         akcipher_request_complete(req, err);
 167 }
 168
 169 static int caam_rsa_count_leading_zeros(struct scatterlist *sgl,
 170                                         unsigned int nbytes,
 171                                         unsigned int flags)
 172 {
 173         struct sg_mapping_iter miter;
 174         int lzeros, ents;
 175         unsigned int len;
 176         unsigned int tbytes = nbytes;
 177         const u8 *buff;
 178
 179         ents = sg_nents_for_len(sgl, nbytes);
 180         if (ents < 0)
 181                 return ents;
 182
 183         sg_miter_start(&miter, sgl, ents, SG_MITER_FROM_SG | flags);
 184
 185         lzeros = 0;
 186         len = 0;
 187         while (nbytes > 0) {
 188                 while (len && !*buff) {
 189                         lzeros++;
 190                         len--;
 191                         buff++;
 192                 }
 193
 194                 if (len && *buff)
 195                         break;
 196
 197                 sg_miter_next(&miter);
 198                 buff = miter.addr;
 199                 len = miter.length;
 200
 201                 nbytes -= lzeros;
 202                 lzeros = 0;
 203         }
 204
 205         miter.consumed = lzeros;
 206         sg_miter_stop(&miter);
 207         nbytes -= lzeros;
 208
 209         return tbytes - nbytes;
 210 }
 211
 212 static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req,
 213                                          size_t desclen)
 214 {
 215         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 216         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 217         struct device *dev = ctx->dev;
 218         struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
 219         struct rsa_edesc *edesc;
 220         gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
 221                        GFP_KERNEL : GFP_ATOMIC;
 222         int sg_flags = (flags == GFP_ATOMIC) ? SG_MITER_ATOMIC : 0;
 223         int sgc;
 224         int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes;
 225         int src_nents, dst_nents;
 226         int lzeros;
 227
 228         lzeros = caam_rsa_count_leading_zeros(req->src, req->src_len, sg_flags);
 229         if (lzeros < 0)
 230                 return ERR_PTR(lzeros);
 231
 232         req->src_len -= lzeros;
 233         req->src = scatterwalk_ffwd(req_ctx->src, req->src, lzeros);
 234
 235         src_nents = sg_nents_for_len(req->src, req->src_len);
 236         dst_nents = sg_nents_for_len(req->dst, req->dst_len);
 237
 238         if (src_nents > 1)
 239                 sec4_sg_len = src_nents;
 240         if (dst_nents > 1)
 241                 sec4_sg_len += dst_nents;
 242
 243         sec4_sg_bytes = sec4_sg_len * sizeof(struct sec4_sg_entry);
 244
 245         /* allocate space for base edesc, hw desc commands and link tables */
 246         edesc = kzalloc(sizeof(*edesc) + desclen + sec4_sg_bytes,
 247                         GFP_DMA | flags);
 248         if (!edesc)
 249                 return ERR_PTR(-ENOMEM);
 250
 251         sgc = dma_map_sg(dev, req->src, src_nents, DMA_TO_DEVICE);
 252         if (unlikely(!sgc)) {
 253                 dev_err(dev, "unable to map source\n");
 254                 goto src_fail;
 255         }
 256
 257         sgc = dma_map_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE);
 258         if (unlikely(!sgc)) {
 259                 dev_err(dev, "unable to map destination\n");
 260                 goto dst_fail;
 261         }
 262
 263         edesc->sec4_sg = (void *)edesc + sizeof(*edesc) + desclen;
 264
 265         sec4_sg_index = 0;
 266         if (src_nents > 1) {
 267                 sg_to_sec4_sg_last(req->src, src_nents, edesc->sec4_sg, 0);
 268                 sec4_sg_index += src_nents;
 269         }
 270         if (dst_nents > 1)
 271                 sg_to_sec4_sg_last(req->dst, dst_nents,
 272                                    edesc->sec4_sg + sec4_sg_index, 0);
 273
 274         /* Save nents for later use in Job Descriptor */
 275         edesc->src_nents = src_nents;
 276         edesc->dst_nents = dst_nents;
 277
 278         if (!sec4_sg_bytes)
 279                 return edesc;
 280
 281         edesc->sec4_sg_dma = dma_map_single(dev, edesc->sec4_sg,
 282                                             sec4_sg_bytes, DMA_TO_DEVICE);
 283         if (dma_mapping_error(dev, edesc->sec4_sg_dma)) {
 284                 dev_err(dev, "unable to map S/G table\n");
 285                 goto sec4_sg_fail;
 286         }
 287
 288         edesc->sec4_sg_bytes = sec4_sg_bytes;
 289
 290         return edesc;
 291
 292 sec4_sg_fail:
 293         dma_unmap_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE);
 294 dst_fail:
 295         dma_unmap_sg(dev, req->src, src_nents, DMA_TO_DEVICE);
 296 src_fail:
 297         kfree(edesc);
 298         return ERR_PTR(-ENOMEM);
 299 }
 300
 301 static int set_rsa_pub_pdb(struct akcipher_request *req,
 302                            struct rsa_edesc *edesc)
 303 {
 304         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 305         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 306         struct caam_rsa_key *key = &ctx->key;
 307         struct device *dev = ctx->dev;
 308         struct rsa_pub_pdb *pdb = &edesc->pdb.pub;
 309         int sec4_sg_index = 0;
 310
 311         pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE);
 312         if (dma_mapping_error(dev, pdb->n_dma)) {
 313                 dev_err(dev, "Unable to map RSA modulus memory\n");
 314                 return -ENOMEM;
 315         }
 316
 317         pdb->e_dma = dma_map_single(dev, key->e, key->e_sz, DMA_TO_DEVICE);
 318         if (dma_mapping_error(dev, pdb->e_dma)) {
 319                 dev_err(dev, "Unable to map RSA public exponent memory\n");
 320                 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
 321                 return -ENOMEM;
 322         }
 323
 324         if (edesc->src_nents > 1) {
 325                 pdb->sgf |= RSA_PDB_SGF_F;
 326                 pdb->f_dma = edesc->sec4_sg_dma;
 327                 sec4_sg_index += edesc->src_nents;
 328         } else {
 329                 pdb->f_dma = sg_dma_address(req->src);
 330         }
 331
 332         if (edesc->dst_nents > 1) {
 333                 pdb->sgf |= RSA_PDB_SGF_G;
 334                 pdb->g_dma = edesc->sec4_sg_dma +
 335                              sec4_sg_index * sizeof(struct sec4_sg_entry);
 336         } else {
 337                 pdb->g_dma = sg_dma_address(req->dst);
 338         }
 339
 340         pdb->sgf |= (key->e_sz << RSA_PDB_E_SHIFT) | key->n_sz;
 341         pdb->f_len = req->src_len;
 342
 343         return 0;
 344 }
 345
 346 static int set_rsa_priv_f1_pdb(struct akcipher_request *req,
 347                                struct rsa_edesc *edesc)
 348 {
 349         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 350         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 351         struct caam_rsa_key *key = &ctx->key;
 352         struct device *dev = ctx->dev;
 353         struct rsa_priv_f1_pdb *pdb = &edesc->pdb.priv_f1;
 354         int sec4_sg_index = 0;
 355
 356         pdb->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE);
 357         if (dma_mapping_error(dev, pdb->n_dma)) {
 358                 dev_err(dev, "Unable to map modulus memory\n");
 359                 return -ENOMEM;
 360         }
 361
 362         pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE);
 363         if (dma_mapping_error(dev, pdb->d_dma)) {
 364                 dev_err(dev, "Unable to map RSA private exponent memory\n");
 365                 dma_unmap_single(dev, pdb->n_dma, key->n_sz, DMA_TO_DEVICE);
 366                 return -ENOMEM;
 367         }
 368
 369         if (edesc->src_nents > 1) {
 370                 pdb->sgf |= RSA_PRIV_PDB_SGF_G;
 371                 pdb->g_dma = edesc->sec4_sg_dma;
 372                 sec4_sg_index += edesc->src_nents;
 373         } else {
 374                 pdb->g_dma = sg_dma_address(req->src);
 375         }
 376
 377         if (edesc->dst_nents > 1) {
 378                 pdb->sgf |= RSA_PRIV_PDB_SGF_F;
 379                 pdb->f_dma = edesc->sec4_sg_dma +
 380                              sec4_sg_index * sizeof(struct sec4_sg_entry);
 381         } else {
 382                 pdb->f_dma = sg_dma_address(req->dst);
 383         }
 384
 385         pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz;
 386
 387         return 0;
 388 }
 389
 390 static int set_rsa_priv_f2_pdb(struct akcipher_request *req,
 391                                struct rsa_edesc *edesc)
 392 {
 393         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 394         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 395         struct caam_rsa_key *key = &ctx->key;
 396         struct device *dev = ctx->dev;
 397         struct rsa_priv_f2_pdb *pdb = &edesc->pdb.priv_f2;
 398         int sec4_sg_index = 0;
 399         size_t p_sz = key->p_sz;
 400         size_t q_sz = key->q_sz;
 401
 402         pdb->d_dma = dma_map_single(dev, key->d, key->d_sz, DMA_TO_DEVICE);
 403         if (dma_mapping_error(dev, pdb->d_dma)) {
 404                 dev_err(dev, "Unable to map RSA private exponent memory\n");
 405                 return -ENOMEM;
 406         }
 407
 408         pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE);
 409         if (dma_mapping_error(dev, pdb->p_dma)) {
 410                 dev_err(dev, "Unable to map RSA prime factor p memory\n");
 411                 goto unmap_d;
 412         }
 413
 414         pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE);
 415         if (dma_mapping_error(dev, pdb->q_dma)) {
 416                 dev_err(dev, "Unable to map RSA prime factor q memory\n");
 417                 goto unmap_p;
 418         }
 419
 420         pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL);
 421         if (dma_mapping_error(dev, pdb->tmp1_dma)) {
 422                 dev_err(dev, "Unable to map RSA tmp1 memory\n");
 423                 goto unmap_q;
 424         }
 425
 426         pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL);
 427         if (dma_mapping_error(dev, pdb->tmp2_dma)) {
 428                 dev_err(dev, "Unable to map RSA tmp2 memory\n");
 429                 goto unmap_tmp1;
 430         }
 431
 432         if (edesc->src_nents > 1) {
 433                 pdb->sgf |= RSA_PRIV_PDB_SGF_G;
 434                 pdb->g_dma = edesc->sec4_sg_dma;
 435                 sec4_sg_index += edesc->src_nents;
 436         } else {
 437                 pdb->g_dma = sg_dma_address(req->src);
 438         }
 439
 440         if (edesc->dst_nents > 1) {
 441                 pdb->sgf |= RSA_PRIV_PDB_SGF_F;
 442                 pdb->f_dma = edesc->sec4_sg_dma +
 443                              sec4_sg_index * sizeof(struct sec4_sg_entry);
 444         } else {
 445                 pdb->f_dma = sg_dma_address(req->dst);
 446         }
 447
 448         pdb->sgf |= (key->d_sz << RSA_PDB_D_SHIFT) | key->n_sz;
 449         pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz;
 450
 451         return 0;
 452
 453 unmap_tmp1:
 454         dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
 455 unmap_q:
 456         dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
 457 unmap_p:
 458         dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
 459 unmap_d:
 460         dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
 461
 462         return -ENOMEM;
 463 }
 464
 465 static int set_rsa_priv_f3_pdb(struct akcipher_request *req,
 466                                struct rsa_edesc *edesc)
 467 {
 468         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 469         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 470         struct caam_rsa_key *key = &ctx->key;
 471         struct device *dev = ctx->dev;
 472         struct rsa_priv_f3_pdb *pdb = &edesc->pdb.priv_f3;
 473         int sec4_sg_index = 0;
 474         size_t p_sz = key->p_sz;
 475         size_t q_sz = key->q_sz;
 476
 477         pdb->p_dma = dma_map_single(dev, key->p, p_sz, DMA_TO_DEVICE);
 478         if (dma_mapping_error(dev, pdb->p_dma)) {
 479                 dev_err(dev, "Unable to map RSA prime factor p memory\n");
 480                 return -ENOMEM;
 481         }
 482
 483         pdb->q_dma = dma_map_single(dev, key->q, q_sz, DMA_TO_DEVICE);
 484         if (dma_mapping_error(dev, pdb->q_dma)) {
 485                 dev_err(dev, "Unable to map RSA prime factor q memory\n");
 486                 goto unmap_p;
 487         }
 488
 489         pdb->dp_dma = dma_map_single(dev, key->dp, p_sz, DMA_TO_DEVICE);
 490         if (dma_mapping_error(dev, pdb->dp_dma)) {
 491                 dev_err(dev, "Unable to map RSA exponent dp memory\n");
 492                 goto unmap_q;
 493         }
 494
 495         pdb->dq_dma = dma_map_single(dev, key->dq, q_sz, DMA_TO_DEVICE);
 496         if (dma_mapping_error(dev, pdb->dq_dma)) {
 497                 dev_err(dev, "Unable to map RSA exponent dq memory\n");
 498                 goto unmap_dp;
 499         }
 500
 501         pdb->c_dma = dma_map_single(dev, key->qinv, p_sz, DMA_TO_DEVICE);
 502         if (dma_mapping_error(dev, pdb->c_dma)) {
 503                 dev_err(dev, "Unable to map RSA CRT coefficient qinv memory\n");
 504                 goto unmap_dq;
 505         }
 506
 507         pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL);
 508         if (dma_mapping_error(dev, pdb->tmp1_dma)) {
 509                 dev_err(dev, "Unable to map RSA tmp1 memory\n");
 510                 goto unmap_qinv;
 511         }
 512
 513         pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL);
 514         if (dma_mapping_error(dev, pdb->tmp2_dma)) {
 515                 dev_err(dev, "Unable to map RSA tmp2 memory\n");
 516                 goto unmap_tmp1;
 517         }
 518
 519         if (edesc->src_nents > 1) {
 520                 pdb->sgf |= RSA_PRIV_PDB_SGF_G;
 521                 pdb->g_dma = edesc->sec4_sg_dma;
 522                 sec4_sg_index += edesc->src_nents;
 523         } else {
 524                 pdb->g_dma = sg_dma_address(req->src);
 525         }
 526
 527         if (edesc->dst_nents > 1) {
 528                 pdb->sgf |= RSA_PRIV_PDB_SGF_F;
 529                 pdb->f_dma = edesc->sec4_sg_dma +
 530                              sec4_sg_index * sizeof(struct sec4_sg_entry);
 531         } else {
 532                 pdb->f_dma = sg_dma_address(req->dst);
 533         }
 534
 535         pdb->sgf |= key->n_sz;
 536         pdb->p_q_len = (q_sz << RSA_PDB_Q_SHIFT) | p_sz;
 537
 538         return 0;
 539
 540 unmap_tmp1:
 541         dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
 542 unmap_qinv:
 543         dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE);
 544 unmap_dq:
 545         dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE);
 546 unmap_dp:
 547         dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE);
 548 unmap_q:
 549         dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
 550 unmap_p:
 551         dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
 552
 553         return -ENOMEM;
 554 }
 555
 556 static int caam_rsa_enc(struct akcipher_request *req)
 557 {
 558         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 559         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 560         struct caam_rsa_key *key = &ctx->key;
 561         struct device *jrdev = ctx->dev;
 562         struct rsa_edesc *edesc;
 563         int ret;
 564
 565         if (unlikely(!key->n || !key->e))
 566                 return -EINVAL;
 567
 568         if (req->dst_len < key->n_sz) {
 569                 req->dst_len = key->n_sz;
 570                 dev_err(jrdev, "Output buffer length less than parameter n\n");
 571                 return -EOVERFLOW;
 572         }
 573
 574         /* Allocate extended descriptor */
 575         edesc = rsa_edesc_alloc(req, DESC_RSA_PUB_LEN);
 576         if (IS_ERR(edesc))
 577                 return PTR_ERR(edesc);
 578
 579         /* Set RSA Encrypt Protocol Data Block */
 580         ret = set_rsa_pub_pdb(req, edesc);
 581         if (ret)
 582                 goto init_fail;
 583
 584         /* Initialize Job Descriptor */
 585         init_rsa_pub_desc(edesc->hw_desc, &edesc->pdb.pub);
 586
 587         ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_pub_done, req);
 588         if (!ret)
 589                 return -EINPROGRESS;
 590
 591         rsa_pub_unmap(jrdev, edesc, req);
 592
 593 init_fail:
 594         rsa_io_unmap(jrdev, edesc, req);
 595         kfree(edesc);
 596         return ret;
 597 }
 598
 599 static int caam_rsa_dec_priv_f1(struct akcipher_request *req)
 600 {
 601         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 602         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 603         struct device *jrdev = ctx->dev;
 604         struct rsa_edesc *edesc;
 605         int ret;
 606
 607         /* Allocate extended descriptor */
 608         edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F1_LEN);
 609         if (IS_ERR(edesc))
 610                 return PTR_ERR(edesc);
 611
 612         /* Set RSA Decrypt Protocol Data Block - Private Key Form #1 */
 613         ret = set_rsa_priv_f1_pdb(req, edesc);
 614         if (ret)
 615                 goto init_fail;
 616
 617         /* Initialize Job Descriptor */
 618         init_rsa_priv_f1_desc(edesc->hw_desc, &edesc->pdb.priv_f1);
 619
 620         ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f1_done, req);
 621         if (!ret)
 622                 return -EINPROGRESS;
 623
 624         rsa_priv_f1_unmap(jrdev, edesc, req);
 625
 626 init_fail:
 627         rsa_io_unmap(jrdev, edesc, req);
 628         kfree(edesc);
 629         return ret;
 630 }
 631
 632 static int caam_rsa_dec_priv_f2(struct akcipher_request *req)
 633 {
 634         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 635         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 636         struct device *jrdev = ctx->dev;
 637         struct rsa_edesc *edesc;
 638         int ret;
 639
 640         /* Allocate extended descriptor */
 641         edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F2_LEN);
 642         if (IS_ERR(edesc))
 643                 return PTR_ERR(edesc);
 644
 645         /* Set RSA Decrypt Protocol Data Block - Private Key Form #2 */
 646         ret = set_rsa_priv_f2_pdb(req, edesc);
 647         if (ret)
 648                 goto init_fail;
 649
 650         /* Initialize Job Descriptor */
 651         init_rsa_priv_f2_desc(edesc->hw_desc, &edesc->pdb.priv_f2);
 652
 653         ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f2_done, req);
 654         if (!ret)
 655                 return -EINPROGRESS;
 656
 657         rsa_priv_f2_unmap(jrdev, edesc, req);
 658
 659 init_fail:
 660         rsa_io_unmap(jrdev, edesc, req);
 661         kfree(edesc);
 662         return ret;
 663 }
 664
 665 static int caam_rsa_dec_priv_f3(struct akcipher_request *req)
 666 {
 667         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 668         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 669         struct device *jrdev = ctx->dev;
 670         struct rsa_edesc *edesc;
 671         int ret;
 672
 673         /* Allocate extended descriptor */
 674         edesc = rsa_edesc_alloc(req, DESC_RSA_PRIV_F3_LEN);
 675         if (IS_ERR(edesc))
 676                 return PTR_ERR(edesc);
 677
 678         /* Set RSA Decrypt Protocol Data Block - Private Key Form #3 */
 679         ret = set_rsa_priv_f3_pdb(req, edesc);
 680         if (ret)
 681                 goto init_fail;
 682
 683         /* Initialize Job Descriptor */
 684         init_rsa_priv_f3_desc(edesc->hw_desc, &edesc->pdb.priv_f3);
 685
 686         ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f3_done, req);
 687         if (!ret)
 688                 return -EINPROGRESS;
 689
 690         rsa_priv_f3_unmap(jrdev, edesc, req);
 691
 692 init_fail:
 693         rsa_io_unmap(jrdev, edesc, req);
 694         kfree(edesc);
 695         return ret;
 696 }
 697
 698 static int caam_rsa_dec(struct akcipher_request *req)
 699 {
 700         struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
 701         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 702         struct caam_rsa_key *key = &ctx->key;
 703         int ret;
 704
 705         if (unlikely(!key->n || !key->d))
 706                 return -EINVAL;
 707
 708         if (req->dst_len < key->n_sz) {
 709                 req->dst_len = key->n_sz;
 710                 dev_err(ctx->dev, "Output buffer length less than parameter n\n");
 711                 return -EOVERFLOW;
 712         }
 713
 714         if (key->priv_form == FORM3)
 715                 ret = caam_rsa_dec_priv_f3(req);
 716         else if (key->priv_form == FORM2)
 717                 ret = caam_rsa_dec_priv_f2(req);
 718         else
 719                 ret = caam_rsa_dec_priv_f1(req);
 720
 721         return ret;
 722 }
 723
 724 static void caam_rsa_free_key(struct caam_rsa_key *key)
 725 {
 726         kzfree(key->d);
 727         kzfree(key->p);
 728         kzfree(key->q);
 729         kzfree(key->dp);
 730         kzfree(key->dq);
 731         kzfree(key->qinv);
 732         kzfree(key->tmp1);
 733         kzfree(key->tmp2);
 734         kfree(key->e);
 735         kfree(key->n);
 736         memset(key, 0, sizeof(*key));
 737 }
 738
 739 static void caam_rsa_drop_leading_zeros(const u8 **ptr, size_t *nbytes)
 740 {
 741         while (!**ptr && *nbytes) {
 742                 (*ptr)++;
 743                 (*nbytes)--;
 744         }
 745 }
 746
 747 /**
 748  * caam_read_rsa_crt - Used for reading dP, dQ, qInv CRT members.
 749  * dP, dQ and qInv could decode to less than corresponding p, q length, as the
 750  * BER-encoding requires that the minimum number of bytes be used to encode the
 751  * integer. dP, dQ, qInv decoded values have to be zero-padded to appropriate
 752  * length.
 753  *
 754  * @ptr   : pointer to {dP, dQ, qInv} CRT member
 755  * @nbytes: length in bytes of {dP, dQ, qInv} CRT member
 756  * @dstlen: length in bytes of corresponding p or q prime factor
 757  */
 758 static u8 *caam_read_rsa_crt(const u8 *ptr, size_t nbytes, size_t dstlen)
 759 {
 760         u8 *dst;
 761
 762         caam_rsa_drop_leading_zeros(&ptr, &nbytes);
 763         if (!nbytes)
 764                 return NULL;
 765
 766         dst = kzalloc(dstlen, GFP_DMA | GFP_KERNEL);
 767         if (!dst)
 768                 return NULL;
 769
 770         memcpy(dst + (dstlen - nbytes), ptr, nbytes);
 771
 772         return dst;
 773 }
 774
 775 /**
 776  * caam_read_raw_data - Read a raw byte stream as a positive integer.
 777  * The function skips buffer's leading zeros, copies the remained data
 778  * to a buffer allocated in the GFP_DMA | GFP_KERNEL zone and returns
 779  * the address of the new buffer.
 780  *
 781  * @buf   : The data to read
 782  * @nbytes: The amount of data to read
 783  */
 784 static inline u8 *caam_read_raw_data(const u8 *buf, size_t *nbytes)
 785 {
 786
 787         caam_rsa_drop_leading_zeros(&buf, nbytes);
 788         if (!*nbytes)
 789                 return NULL;
 790
 791         return kmemdup(buf, *nbytes, GFP_DMA | GFP_KERNEL);
 792 }
 793
 794 static int caam_rsa_check_key_length(unsigned int len)
 795 {
 796         if (len > 4096)
 797                 return -EINVAL;
 798         return 0;
 799 }
 800
 801 static int caam_rsa_set_pub_key(struct crypto_akcipher *tfm, const void *key,
 802                                 unsigned int keylen)
 803 {
 804         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 805         struct rsa_key raw_key = {NULL};
 806         struct caam_rsa_key *rsa_key = &ctx->key;
 807         int ret;
 808
 809         /* Free the old RSA key if any */
 810         caam_rsa_free_key(rsa_key);
 811
 812         ret = rsa_parse_pub_key(&raw_key, key, keylen);
 813         if (ret)
 814                 return ret;
 815
 816         /* Copy key in DMA zone */
 817         rsa_key->e = kzalloc(raw_key.e_sz, GFP_DMA | GFP_KERNEL);
 818         if (!rsa_key->e)
 819                 goto err;
 820
 821         /*
 822          * Skip leading zeros and copy the positive integer to a buffer
 823          * allocated in the GFP_DMA | GFP_KERNEL zone. The decryption descriptor
 824          * expects a positive integer for the RSA modulus and uses its length as
 825          * decryption output length.
 826          */
 827         rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz);
 828         if (!rsa_key->n)
 829                 goto err;
 830
 831         if (caam_rsa_check_key_length(raw_key.n_sz << 3)) {
 832                 caam_rsa_free_key(rsa_key);
 833                 return -EINVAL;
 834         }
 835
 836         rsa_key->e_sz = raw_key.e_sz;
 837         rsa_key->n_sz = raw_key.n_sz;
 838
 839         memcpy(rsa_key->e, raw_key.e, raw_key.e_sz);
 840
 841         return 0;
 842 err:
 843         caam_rsa_free_key(rsa_key);
 844         return -ENOMEM;
 845 }
 846
 847 static void caam_rsa_set_priv_key_form(struct caam_rsa_ctx *ctx,
 848                                        struct rsa_key *raw_key)
 849 {
 850         struct caam_rsa_key *rsa_key = &ctx->key;
 851         size_t p_sz = raw_key->p_sz;
 852         size_t q_sz = raw_key->q_sz;
 853
 854         rsa_key->p = caam_read_raw_data(raw_key->p, &p_sz);
 855         if (!rsa_key->p)
 856                 return;
 857         rsa_key->p_sz = p_sz;
 858
 859         rsa_key->q = caam_read_raw_data(raw_key->q, &q_sz);
 860         if (!rsa_key->q)
 861                 goto free_p;
 862         rsa_key->q_sz = q_sz;
 863
 864         rsa_key->tmp1 = kzalloc(raw_key->p_sz, GFP_DMA | GFP_KERNEL);
 865         if (!rsa_key->tmp1)
 866                 goto free_q;
 867
 868         rsa_key->tmp2 = kzalloc(raw_key->q_sz, GFP_DMA | GFP_KERNEL);
 869         if (!rsa_key->tmp2)
 870                 goto free_tmp1;
 871
 872         rsa_key->priv_form = FORM2;
 873
 874         rsa_key->dp = caam_read_rsa_crt(raw_key->dp, raw_key->dp_sz, p_sz);
 875         if (!rsa_key->dp)
 876                 goto free_tmp2;
 877
 878         rsa_key->dq = caam_read_rsa_crt(raw_key->dq, raw_key->dq_sz, q_sz);
 879         if (!rsa_key->dq)
 880                 goto free_dp;
 881
 882         rsa_key->qinv = caam_read_rsa_crt(raw_key->qinv, raw_key->qinv_sz,
 883                                           q_sz);
 884         if (!rsa_key->qinv)
 885                 goto free_dq;
 886
 887         rsa_key->priv_form = FORM3;
 888
 889         return;
 890
 891 free_dq:
 892         kzfree(rsa_key->dq);
 893 free_dp:
 894         kzfree(rsa_key->dp);
 895 free_tmp2:
 896         kzfree(rsa_key->tmp2);
 897 free_tmp1:
 898         kzfree(rsa_key->tmp1);
 899 free_q:
 900         kzfree(rsa_key->q);
 901 free_p:
 902         kzfree(rsa_key->p);
 903 }
 904
 905 static int caam_rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key,
 906                                  unsigned int keylen)
 907 {
 908         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 909         struct rsa_key raw_key = {NULL};
 910         struct caam_rsa_key *rsa_key = &ctx->key;
 911         int ret;
 912
 913         /* Free the old RSA key if any */
 914         caam_rsa_free_key(rsa_key);
 915
 916         ret = rsa_parse_priv_key(&raw_key, key, keylen);
 917         if (ret)
 918                 return ret;
 919
 920         /* Copy key in DMA zone */
 921         rsa_key->d = kzalloc(raw_key.d_sz, GFP_DMA | GFP_KERNEL);
 922         if (!rsa_key->d)
 923                 goto err;
 924
 925         rsa_key->e = kzalloc(raw_key.e_sz, GFP_DMA | GFP_KERNEL);
 926         if (!rsa_key->e)
 927                 goto err;
 928
 929         /*
 930          * Skip leading zeros and copy the positive integer to a buffer
 931          * allocated in the GFP_DMA | GFP_KERNEL zone. The decryption descriptor
 932          * expects a positive integer for the RSA modulus and uses its length as
 933          * decryption output length.
 934          */
 935         rsa_key->n = caam_read_raw_data(raw_key.n, &raw_key.n_sz);
 936         if (!rsa_key->n)
 937                 goto err;
 938
 939         if (caam_rsa_check_key_length(raw_key.n_sz << 3)) {
 940                 caam_rsa_free_key(rsa_key);
 941                 return -EINVAL;
 942         }
 943
 944         rsa_key->d_sz = raw_key.d_sz;
 945         rsa_key->e_sz = raw_key.e_sz;
 946         rsa_key->n_sz = raw_key.n_sz;
 947
 948         memcpy(rsa_key->d, raw_key.d, raw_key.d_sz);
 949         memcpy(rsa_key->e, raw_key.e, raw_key.e_sz);
 950
 951         caam_rsa_set_priv_key_form(ctx, &raw_key);
 952
 953         return 0;
 954
 955 err:
 956         caam_rsa_free_key(rsa_key);
 957         return -ENOMEM;
 958 }
 959
 960 static unsigned int caam_rsa_max_size(struct crypto_akcipher *tfm)
 961 {
 962         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 963
 964         return ctx->key.n_sz;
 965 }
 966
 967 /* Per session pkc's driver context creation function */
 968 static int caam_rsa_init_tfm(struct crypto_akcipher *tfm)
 969 {
 970         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 971
 972         ctx->dev = caam_jr_alloc();
 973
 974         if (IS_ERR(ctx->dev)) {
 975                 pr_err("Job Ring Device allocation for transform failed\n");
 976                 return PTR_ERR(ctx->dev);
 977         }
 978
 979         return 0;
 980 }
 981
 982 /* Per session pkc's driver context cleanup function */
 983 static void caam_rsa_exit_tfm(struct crypto_akcipher *tfm)
 984 {
 985         struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
 986         struct caam_rsa_key *key = &ctx->key;
 987
 988         caam_rsa_free_key(key);
 989         caam_jr_free(ctx->dev);
 990 }
 991
 992 static struct akcipher_alg caam_rsa = {
 993         .encrypt = caam_rsa_enc,
 994         .decrypt = caam_rsa_dec,
 995         .sign = caam_rsa_dec,
 996         .verify = caam_rsa_enc,
 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 cha_inst, 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                 return -ENODEV;
1045
1046         /* Determine public key hardware accelerator presence. */
1047         cha_inst = rd_reg32(&priv->ctrl->perfmon.cha_num_ls);
1048         pk_inst = (cha_inst & CHA_ID_LS_PK_MASK) >> CHA_ID_LS_PK_SHIFT;
1049
1050         /* Do not register algorithms if PKHA is not present. */
1051         if (!pk_inst)
1052                 return -ENODEV;
1053
1054         err = crypto_register_akcipher(&caam_rsa);
1055         if (err)
1056                 dev_warn(ctrldev, "%s alg registration failed\n",
1057                          caam_rsa.base.cra_driver_name);
1058         else
1059                 dev_info(ctrldev, "caam pkc algorithms registered in /proc/crypto\n");
1060
1061         return err;
1062 }
1063
1064 static void __exit caam_pkc_exit(void)
1065 {
1066         crypto_unregister_akcipher(&caam_rsa);
1067 }
1068
1069 module_init(caam_pkc_init);
1070 module_exit(caam_pkc_exit);
1071
1072 MODULE_LICENSE("Dual BSD/GPL");
1073 MODULE_DESCRIPTION("FSL CAAM support for PKC functions of crypto API");
1074 MODULE_AUTHOR("Freescale Semiconductor");