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