git.openwrt.org Git - openwrt/staging/aparcar.git/blob

   1 From b2fb5441c4613465e0c8f9203cdec4f8083d2fdd Mon Sep 17 00:00:00 2001
   2 From: Franck LENORMAND <franck.lenormand@nxp.com>
   3 Date: Fri, 5 Oct 2018 16:08:25 +0200
   4 Subject: [PATCH] MLK-19801-1 crypto: caam - add tag functionality
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Add functions to tag an object with metadata(configuration).
  10
  11 It is possible to:
  12  - create metadata:
  13         - init_tag_object_header
  14         - init_blackey_conf
  15         - set_tag_object_conf
  16  - retrieve metadata:
  17         - get_tag_object_conf
  18         - get_blackey_conf
  19
  20 The API expects an object to be a space a memory
  21 with an address and a size.
  22
  23 The implementation of the tag is currently exposed
  24 but users shouldn't access it directly, they should
  25 use the functions provided.
  26
  27 Signed-off-by: Franck LENORMAND <franck.lenormand@nxp.com>
  28 (cherry picked from commit ebbb132da8e7f9de7f3d375eff8d87f684feb1eb)
  29 Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
  30 (cherry picked from commit 8b6f6b4474be33ee271dfe2cce79f9f6335733aa)
  31
  32 -make tag functionality depend on JR
  33 -change commit headline prefix
  34
  35 Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
  36 ---
  37  drivers/crypto/caam/Kconfig      |  10 ++
  38  drivers/crypto/caam/Makefile     |   1 +
  39  drivers/crypto/caam/tag_object.c | 260 +++++++++++++++++++++++++++++++++++++++
  40  drivers/crypto/caam/tag_object.h | 100 +++++++++++++++
  41  4 files changed, 371 insertions(+)
  42  create mode 100644 drivers/crypto/caam/tag_object.c
  43  create mode 100644 drivers/crypto/caam/tag_object.h
  44
  45 --- a/drivers/crypto/caam/Kconfig
  46 +++ b/drivers/crypto/caam/Kconfig
  47 @@ -147,6 +147,16 @@ config CRYPTO_DEV_FSL_CAAM_RNG_API
  48           Selecting this will register the SEC4 hardware rng to
  49           the hw_random API for suppying the kernel entropy pool.
  50
  51 +config CRYPTO_DEV_FSL_CAAM_TK_API
  52 +       bool "Register tagged key cryptography implementations with Crypto API"
  53 +       depends on CRYPTO_DEV_FSL_CAAM_CRYPTO_API
  54 +       help
  55 +         Selecting this will register algorithms supporting tagged
  56 +         key.
  57 +
  58 +         Tagged key are keys that contains metadata indicating what
  59 +         they are and how to handle them.
  60 +
  61  config CRYPTO_DEV_FSL_CAAM_RNG_TEST
  62         bool "Test caam rng"
  63         depends on CRYPTO_DEV_FSL_CAAM_RNG_API
  64 --- a/drivers/crypto/caam/Makefile
  65 +++ b/drivers/crypto/caam/Makefile
  66 @@ -24,6 +24,7 @@ caam_jr-$(CONFIG_CRYPTO_DEV_FSL_CAAM_PKC
  67  caam_jr-$(CONFIG_CRYPTO_DEV_FSL_CAAM_SM) += sm_store.o
  68  caam_jr-$(CONFIG_CRYPTO_DEV_FSL_CAAM_SM_TEST) += sm_test.o
  69  caam_jr-$(CONFIG_CRYPTO_DEV_FSL_CAAM_SECVIO) += secvio.o
  70 +caam-jr-$(CONFIG_CRYPTO_DEV_FSL_CAAM_TK_API) += tag_object.o
  71
  72  caam-$(CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API_QI) += qi.o
  73  ifneq ($(CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API_QI),)
  74 --- /dev/null
  75 +++ b/drivers/crypto/caam/tag_object.c
  76 @@ -0,0 +1,260 @@
  77 +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
  78 +/*
  79 + * Copyright 2018-2019 NXP
  80 + */
  81 +
  82 +#include <linux/export.h>
  83 +#include <linux/string.h>
  84 +#include <linux/errno.h>
  85 +
  86 +#include "tag_object.h"
  87 +#include "desc.h"
  88 +
  89 +/*
  90 + * Magic number to clearly identify the structure is for us
  91 + * 0x54 = 'T'
  92 + * 0x61 = 'a'
  93 + * 0x67 = 'g'
  94 + * 0x4f = 'O'
  95 + */
  96 +#define TAG_OBJECT_MAGIC 0x5461674f
  97 +
  98 +/**
  99 + * struct tagged_object - Structure representing a tagged object
 100 + * @tag : The configuration of the data
 101 + * @object : The object
 102 + */
 103 +struct tagged_object {
 104 +       struct tag_object_conf tag;
 105 +       char object;
 106 +};
 107 +
 108 +/**
 109 + * is_bk_type() - Determines if black key type.
 110 + * @type: The type
 111 + *
 112 + * Return: True if black key type, False otherwise.
 113 + */
 114 +static bool is_bk_type(enum tag_type type)
 115 +{
 116 +       return (type == TAG_TYPE_BLACK_KEY_ECB) ||
 117 +               (type == TAG_TYPE_BLACK_KEY_ECB_TRUSTED) ||
 118 +               (type == TAG_TYPE_BLACK_KEY_CCM) ||
 119 +               (type == TAG_TYPE_BLACK_KEY_CCM_TRUSTED);
 120 +}
 121 +
 122 +/**
 123 + * is_bk_conf() - Determines if black key conf.
 124 + * @tag_obj_conf : The tag object conf
 125 + *
 126 + * Return: True if black key conf, False otherwise.
 127 + */
 128 +bool is_bk_conf(const struct tag_object_conf *tag_obj_conf)
 129 +{
 130 +       return is_bk_type(tag_obj_conf->header.type);
 131 +}
 132 +EXPORT_SYMBOL(is_bk_conf);
 133 +
 134 +/**
 135 + * get_bk_conf() - Gets the block conf.
 136 + * @tag_obj_conf : The tag object conf
 137 + *
 138 + * Return: The block conf.
 139 + */
 140 +const struct blackey_conf *get_bk_conf(const struct tag_object_conf *tag_obj_conf)
 141 +{
 142 +       return &tag_obj_conf->conf.bk_conf;
 143 +}
 144 +
 145 +/**
 146 + * get_tag_object_overhead() - Gets the tag object overhead.
 147 + *
 148 + * Return: The tag object overhead.
 149 + */
 150 +size_t get_tag_object_overhead(void)
 151 +{
 152 +       return TAG_OVERHEAD;
 153 +}
 154 +EXPORT_SYMBOL(get_tag_object_overhead);
 155 +
 156 +/**
 157 + * is_valid_type() - Determines if valid type.
 158 + * @type : The type
 159 + *
 160 + * Return: True if valid type, False otherwise.
 161 + */
 162 +bool is_valid_type(enum tag_type type)
 163 +{
 164 +       return (type > TAG_TYPE_NOT_SUPPORTED) && (type < NB_TAG_TYPE);
 165 +}
 166 +EXPORT_SYMBOL(is_valid_type);
 167 +
 168 +/**
 169 + * is_valid_header() - Determines if valid header.
 170 + * @header : The header
 171 + *
 172 + * Return: True if valid tag object conf, False otherwise.
 173 + */
 174 +static bool is_valid_header(const struct conf_header *header)
 175 +{
 176 +       bool valid = header->_magic_number == TAG_OBJECT_MAGIC;
 177 +
 178 +       valid = valid && is_valid_type(header->type);
 179 +
 180 +       return valid;
 181 +}
 182 +
 183 +/**
 184 + * is_valid_tag_object_conf() - Determines if valid tag object conf.
 185 + * @tag_obj_conf : The tag object conf
 186 + *
 187 + * Return: True if valid header, False otherwise.
 188 + */
 189 +bool is_valid_tag_object_conf(const struct tag_object_conf *tag_obj_conf)
 190 +{
 191 +       bool valid = true;
 192 +
 193 +       valid = is_valid_header(&tag_obj_conf->header);
 194 +
 195 +       return valid;
 196 +}
 197 +EXPORT_SYMBOL(is_valid_tag_object_conf);
 198 +
 199 +/**
 200 + * get_tag_object_conf() - Gets a pointer on the tag object conf.
 201 + * @tag_obj_conf : The tag object conf
 202 + * @buffer : The buffer
 203 + * @size : The size
 204 + *
 205 + * Return: 0 if success, else error code
 206 + */
 207 +int get_tag_object_conf(void *buffer, size_t size,
 208 +                       struct tag_object_conf **tag_obj_conf)
 209 +{
 210 +       bool is_valid;
 211 +       struct tagged_object *tago = (struct tagged_object *)buffer;
 212 +       size_t conf_size = get_tag_object_overhead();
 213 +
 214 +       /* Check we can retrieve the conf */
 215 +       if (size < conf_size)
 216 +               return -EINVAL;
 217 +
 218 +       is_valid = is_valid_tag_object_conf(&tago->tag);
 219 +
 220 +       *tag_obj_conf = &tago->tag;
 221 +
 222 +       return (is_valid) ? 0 : -EINVAL;
 223 +}
 224 +EXPORT_SYMBOL(get_tag_object_conf);
 225 +
 226 +/**
 227 + * init_tag_object_header() - Initialize the tag object header
 228 + * @conf_header : The configuration header
 229 + * @type : The type
 230 + *
 231 + * It initialize the header structure
 232 + */
 233 +void init_tag_object_header(struct conf_header *conf_header,
 234 +                           enum tag_type type)
 235 +{
 236 +       conf_header->_magic_number = TAG_OBJECT_MAGIC;
 237 +       conf_header->type = type;
 238 +}
 239 +EXPORT_SYMBOL(init_tag_object_header);
 240 +
 241 +/**
 242 + * set_tag_object_conf() - Sets the tag object conf.
 243 + * @tag_obj_conf : The tag object conf
 244 + * @buffer : The buffer
 245 + * @obj_size : The object size
 246 + * @to_size : The tagged object size
 247 + *
 248 + * Return: 0 if success, else error code
 249 + */
 250 +int set_tag_object_conf(const struct tag_object_conf *tag_obj_conf,
 251 +                       void *buffer, size_t obj_size, u32 *to_size)
 252 +{
 253 +       struct tagged_object *tago = buffer;
 254 +       size_t conf_size = get_tag_object_overhead();
 255 +       size_t req_size = obj_size + conf_size;
 256 +
 257 +       /* Check we can set the conf */
 258 +       if (*to_size < req_size) {
 259 +               *to_size = req_size;
 260 +               return -EINVAL;
 261 +       }
 262 +
 263 +       /* Move the object */
 264 +       memmove(&tago->object, buffer, obj_size);
 265 +
 266 +       /* Copy the tag */
 267 +       memcpy(&tago->tag, tag_obj_conf, conf_size);
 268 +
 269 +       *to_size = req_size;
 270 +
 271 +       return 0;
 272 +}
 273 +EXPORT_SYMBOL(set_tag_object_conf);
 274 +
 275 +/**
 276 + * init_blackey_conf() - Initialize the black key configuration
 277 + * @blackey_conf : The blackey conf
 278 + * @len : The length
 279 + * @ccm : The ccm
 280 + * @tk : The trusted key
 281 + *
 282 + * It initialize the black key configuration structure
 283 + */
 284 +void init_blackey_conf(struct blackey_conf *blackey_conf,
 285 +                      size_t len, bool ccm, bool tk)
 286 +{
 287 +       blackey_conf->real_len = len;
 288 +       blackey_conf->load = KEY_ENC
 289 +                               | ((ccm) ? KEY_EKT : 0)
 290 +                               | ((tk) ? KEY_TK : 0);
 291 +}
 292 +EXPORT_SYMBOL(init_blackey_conf);
 293 +
 294 +/**
 295 + * get_blackey_conf() - Get the black key configuration
 296 + * @blackey_conf : The blackey conf
 297 + * @real_len : The real length
 298 + * @load_param : The load parameter
 299 + *
 300 + * It retrieve the black key configuration
 301 + */
 302 +void get_blackey_conf(const struct blackey_conf *blackey_conf,
 303 +                     u32 *real_len, u32 *load_param)
 304 +{
 305 +       *real_len = blackey_conf->real_len;
 306 +       *load_param = blackey_conf->load;
 307 +}
 308 +EXPORT_SYMBOL(get_blackey_conf);
 309 +
 310 +/**
 311 + * get_tagged_data() - Get a pointer on the data and the size
 312 + * @tagged_object : Pointer on the tagged object
 313 + * @tagged_object_size : tagged object size in bytes
 314 + * @data : Pointer on the data
 315 + * @data_size : data size in bytes
 316 + *
 317 + * Return: 0 if success, else error code
 318 + */
 319 +int get_tagged_data(void *tagged_object, size_t tagged_object_size,
 320 +                   void **data, u32 *data_size)
 321 +{
 322 +       struct tagged_object *tago =
 323 +               (struct tagged_object *)tagged_object;
 324 +       size_t conf_size = get_tag_object_overhead();
 325 +
 326 +       /* Check we can retrieve the object */
 327 +       if (tagged_object_size < conf_size)
 328 +               return -EINVAL;
 329 +
 330 +       /* Retrieve the object */
 331 +       *data = &tago->object;
 332 +       *data_size = tagged_object_size - conf_size;
 333 +
 334 +       return 0;
 335 +}
 336 +EXPORT_SYMBOL(get_tagged_data);
 337 --- /dev/null
 338 +++ b/drivers/crypto/caam/tag_object.h
 339 @@ -0,0 +1,100 @@
 340 +/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
 341 +/*
 342 + * Copyright 2018-2019 NXP
 343 + */
 344 +
 345 +#ifndef _TAG_OBJECT_H_
 346 +#define _TAG_OBJECT_H_
 347 +
 348 +#include <linux/types.h>
 349 +
 350 +#define TAG_MIN_SIZE (2 * sizeof(struct conf_header))
 351 +#define TAG_OVERHEAD sizeof(struct tag_object_conf)
 352 +
 353 +/**
 354 + * enum tag_type - Type of data represented by the tag
 355 + */
 356 +enum tag_type {
 357 +       /** @TAG_TYPE_NOT_SUPPORTED: The type is not supported */
 358 +       TAG_TYPE_NOT_SUPPORTED = 0,
 359 +
 360 +       /* Type that passes is_tag_type_valid() */
 361 +       /** @TAG_TYPE_BLACK_KEY_ECB: Black key encrypted with ECB */
 362 +       TAG_TYPE_BLACK_KEY_ECB,
 363 +       /**
 364 +        * @TAG_TYPE_BLACK_KEY_ECB_TRUSTED: ECB Black key created by trusted
 365 +        * descriptor
 366 +        */
 367 +       TAG_TYPE_BLACK_KEY_ECB_TRUSTED,
 368 +       /** @TAG_TYPE_BLACK_KEY_CCM: Black key encrypted with CCM */
 369 +       TAG_TYPE_BLACK_KEY_CCM,
 370 +       /**
 371 +        * @TAG_TYPE_BLACK_KEY_CCM_TRUSTED: CCM Black key created by trusted
 372 +        * descriptor
 373 +        */
 374 +       TAG_TYPE_BLACK_KEY_CCM_TRUSTED,
 375 +
 376 +       /** @NB_TAG_TYPE: Number of type of tag */
 377 +       NB_TAG_TYPE,
 378 +};
 379 +
 380 +/**
 381 + * struct conf_header - Common struture holding the type of data and the magic
 382 + * number
 383 + * @_magic_number : A magic number to identify the structure
 384 + * @type : The type of data contained
 385 + */
 386 +struct conf_header {
 387 +       u32 _magic_number;
 388 +       u32 type;
 389 +};
 390 +
 391 +/**
 392 + * struct blackey_conf - Configuration for a black key
 393 + * @load : Load parameter for CAAM
 394 + * @real_len : Length of the key before encryption
 395 + */
 396 +struct blackey_conf {
 397 +       u32 load;
 398 +       u32 real_len;
 399 +};
 400 +
 401 +/**
 402 + * struct tag_object_conf - Common structure which is the tag applied to data
 403 + * @header : Part of the data initialized with common function
 404 + * :c:func:`init_tag_object_header`
 405 + * @conf : Configuration data about the object tagged, initialized with
 406 + * specific function
 407 + */
 408 +struct tag_object_conf {
 409 +       struct conf_header header;
 410 +       union {
 411 +               struct blackey_conf bk_conf;
 412 +       } conf;
 413 +};
 414 +
 415 +bool is_bk_conf(const struct tag_object_conf *tag_obj_conf);
 416 +
 417 +bool is_valid_tag_object_conf(const struct tag_object_conf *tag_obj_conf);
 418 +
 419 +void init_tag_object_header(struct conf_header *conf_header,
 420 +                           enum tag_type type);
 421 +
 422 +int get_tag_object_conf(void *buffer, size_t buffer_size,
 423 +                       struct tag_object_conf **tag_obj_conf);
 424 +
 425 +int set_tag_object_conf(const struct tag_object_conf *tag_obj_conf,
 426 +                       void *buffer, size_t obj_size, u32 *to_size);
 427 +
 428 +size_t get_tag_object_overhead(void);
 429 +
 430 +void get_blackey_conf(const struct blackey_conf *blackey_conf,
 431 +                     u32 *real_len, u32 *load_param);
 432 +
 433 +void init_blackey_conf(struct blackey_conf *blackey_conf,
 434 +                      size_t len, bool ccm, bool tk);
 435 +
 436 +int get_tagged_data(void *buffer, size_t buffer_size,
 437 +                   void **data, u32 *data_size);
 438 +
 439 +#endif /* _TAG_OBJECT_H_ */