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 162     <li>Derived KEK TISCI Description</li>
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 173
 174   <div class="section" id="derived-kek-tisci-description">
 175 <h1>Derived KEK TISCI Description<a class="headerlink" href="#derived-kek-tisci-description" title="Permalink to this headline">¶</a></h1>
 176 <p id="sec-dkek-tisci-desc">This chapter provides information on  System Firmware API for Derived Key Encryption
 177 Key(DKEK) management. The available API are listed below.</p>
 178 <table border="1" class="docutils">
 179 <colgroup>
 180 <col width="20%" />
 181 <col width="80%" />
 182 </colgroup>
 183 <thead valign="bottom">
 184 <tr class="row-odd"><th class="head">TISCI Message ID</th>
 185 <th class="head">Message Name</th>
 186 </tr>
 187 </thead>
 188 <tbody valign="top">
 189 <tr class="row-even"><td>0x9003</td>
 190 <td><a class="reference internal" href="#sec-api-sa2ul-set-dkek"><span class="std std-ref">TISCI_MSG_SA2UL_SET_DKEK</span></a></td>
 191 </tr>
 192 <tr class="row-odd"><td>0x9004</td>
 193 <td><a class="reference internal" href="#sec-api-sa2ul-release-dkek"><span class="std std-ref">TISCI_MSG_SA2UL_RELEASE_DKEK</span></a></td>
 194 </tr>
 195 <tr class="row-even"><td>0x9029</td>
 196 <td><a class="reference internal" href="#sec-api-sa2ul-get-dkek"><span class="std std-ref">TISCI_MSG_SA2UL_GET_DKEK</span></a></td>
 197 </tr>
 198 </tbody>
 199 </table>
 200 <p>This document must be read along side</p>
 201 <ol class="arabic simple">
 202 <li><a class="reference internal" href="../../6_topic_user_guides/dkek_management.html"><span class="doc">Using Derived KEK on HS devices</span></a> and</li>
 203 <li><a class="reference internal" href="../../3_boardcfg/BOARDCFG_SEC.html"><span class="doc">Security Board Configuration</span></a>, specifically <a class="reference internal" href="../../3_boardcfg/BOARDCFG_SEC.html#pub-boardcfg-dkek-config"><span class="std std-ref">Derived KEK Management</span></a></li>
 204 </ol>
 205 <div class="section" id="api-description">
 206 <h2>API Description<a class="headerlink" href="#api-description" title="Permalink to this headline">¶</a></h2>
 207 <div class="section" id="tisci-msg-sa2ul-set-dkek-set-dkek">
 208 <span id="sec-api-sa2ul-set-dkek"></span><h3>TISCI_MSG_SA2UL_SET_DKEK - Set DKEK<a class="headerlink" href="#tisci-msg-sa2ul-set-dkek-set-dkek" title="Permalink to this headline">¶</a></h3>
 209 <p><strong>Usage</strong>:</p>
 210 <table border="1" class="docutils">
 211 <colgroup>
 212 <col width="75%" />
 213 <col width="25%" />
 214 </colgroup>
 215 <tbody valign="top">
 216 <tr class="row-odd"><td><strong>Message Type</strong></td>
 217 <td>Normal</td>
 218 </tr>
 219 <tr class="row-even"><td><strong>Secure Queue Only?</strong></td>
 220 <td>No</td>
 221 </tr>
 222 </tbody>
 223 </table>
 224 </div>
 225 <div class="section" id="tisci-message-id">
 226 <h3>TISCI Message ID<a class="headerlink" href="#tisci-message-id" title="Permalink to this headline">¶</a></h3>
 227 <p><p><code class="docutils literal"><span class="pre">TISCI_MSG_SA2UL_SET_DKEK</span>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; <span class="pre">(0x9003U)</span></code></p>
 228 <p>Message to derive a KEK and set SA2UL DKEK register</p>
 229 </p>
 230 <p><p><strong>struct tisci_msg_sa2ul_set_dkek_req</strong></p>
 231 <p>TISCI Request for setting DKEK in SA2UL registers</p>
 232 <table border="1" class="docutils">
 233 <colgroup>
 234 <col width="13%" />
 235 <col width="12%" />
 236 <col width="75%" />
 237 </colgroup>
 238 <thead valign="bottom">
 239 <tr class="row-odd"><th class="head">Parameter</th>
 240 <th class="head">Type</th>
 241 <th class="head">Description</th>
 242 </tr>
 243 </thead>
 244 <tbody valign="top">
 245 <tr class="row-even"><td>hdr</td>
 246 <td>struct tisci_header</td>
 247 <td>Generic TISCI message header.</td>
 248 </tr>
 249 <tr class="row-odd"><td>sa2ul_instance</td>
 250 <td>u8</td>
 251 <td>SA2UL instance number - set to 0</td>
 252 </tr>
 253 <tr class="row-even"><td>kdf_label_len</td>
 254 <td>u8</td>
 255 <td>Length of “Label” input to KDF</td>
 256 </tr>
 257 <tr class="row-odd"><td>kdf_context_len</td>
 258 <td>u8</td>
 259 <td>Length of “Context” input to KDF</td>
 260 </tr>
 261 <tr class="row-even"><td>kdf_label_and_context</td>
 262 <td>u8</td>
 263 <td>”Label” and “Context” bytes are stored in this array one after another. Maximum length of this field is KDF_LABEL_AND_CONTEXT_LEN_MAX</td>
 264 </tr>
 265 </tbody>
 266 </table>
 267 </p>
 268 <p><p><strong>struct tisci_msg_sa2ul_set_dkek_resp</strong></p>
 269 <p>TISCI Response for setting DKEK in SA2UL registers</p>
 270 <table border="1" class="docutils">
 271 <colgroup>
 272 <col width="20%" />
 273 <col width="32%" />
 274 <col width="48%" />
 275 </colgroup>
 276 <thead valign="bottom">
 277 <tr class="row-odd"><th class="head">Parameter</th>
 278 <th class="head">Type</th>
 279 <th class="head">Description</th>
 280 </tr>
 281 </thead>
 282 <tbody valign="top">
 283 <tr class="row-even"><td>hdr</td>
 284 <td>struct tisci_header</td>
 285 <td>Generic TISCI message header.</td>
 286 </tr>
 287 </tbody>
 288 </table>
 289 </p>
 290 <p><code class="docutils literal"><span class="pre">KDF_LABEL_AND_CONTEXT_LEN_MAX</span>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; <span class="pre">41</span></code></p>
 291 <p>See <a class="reference internal" href="#pub-tisci-dkek-notes"><span class="std std-ref">API Notes</span></a> below.</p>
 292 </div>
 293 <div class="section" id="tisci-msg-sa2ul-release-dkek-release-dkek">
 294 <span id="sec-api-sa2ul-release-dkek"></span><h3>TISCI_MSG_SA2UL_RELEASE_DKEK - Release DKEK<a class="headerlink" href="#tisci-msg-sa2ul-release-dkek-release-dkek" title="Permalink to this headline">¶</a></h3>
 295 <p><strong>Usage</strong>:</p>
 296 <table border="1" class="docutils">
 297 <colgroup>
 298 <col width="75%" />
 299 <col width="25%" />
 300 </colgroup>
 301 <tbody valign="top">
 302 <tr class="row-odd"><td><strong>Message Type</strong></td>
 303 <td>Normal</td>
 304 </tr>
 305 <tr class="row-even"><td><strong>Secure Queue Only?</strong></td>
 306 <td>No</td>
 307 </tr>
 308 </tbody>
 309 </table>
 310 </div>
 311 <div class="section" id="id1">
 312 <h3>TISCI Message ID<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h3>
 313 <p><p><code class="docutils literal"><span class="pre">TISCI_MSG_SA2UL_RELEASE_DKEK</span>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; <span class="pre">(0x9004U)</span></code></p>
 314 <p>Message to erase the DKEK register</p>
 315 </p>
 316 <p><p><strong>struct tisci_msg_sa2ul_release_dkek_req</strong></p>
 317 <p>TISCI Request for releasing DKEK</p>
 318 <table border="1" class="docutils">
 319 <colgroup>
 320 <col width="23%" />
 321 <col width="30%" />
 322 <col width="48%" />
 323 </colgroup>
 324 <thead valign="bottom">
 325 <tr class="row-odd"><th class="head">Parameter</th>
 326 <th class="head">Type</th>
 327 <th class="head">Description</th>
 328 </tr>
 329 </thead>
 330 <tbody valign="top">
 331 <tr class="row-even"><td>hdr</td>
 332 <td>struct tisci_header</td>
 333 <td>Generic TISCI message header.</td>
 334 </tr>
 335 <tr class="row-odd"><td>sa2ul_instance</td>
 336 <td>u8</td>
 337 <td>SA2UL instance number - set to 0</td>
 338 </tr>
 339 </tbody>
 340 </table>
 341 </p>
 342 <p><p><strong>struct tisci_msg_sa2ul_release_dkek_resp</strong></p>
 343 <p>TISCI Response for Releasing DKEK</p>
 344 <table border="1" class="docutils">
 345 <colgroup>
 346 <col width="20%" />
 347 <col width="32%" />
 348 <col width="48%" />
 349 </colgroup>
 350 <thead valign="bottom">
 351 <tr class="row-odd"><th class="head">Parameter</th>
 352 <th class="head">Type</th>
 353 <th class="head">Description</th>
 354 </tr>
 355 </thead>
 356 <tbody valign="top">
 357 <tr class="row-even"><td>hdr</td>
 358 <td>struct tisci_header</td>
 359 <td>Generic TISCI message header.</td>
 360 </tr>
 361 </tbody>
 362 </table>
 363 </p>
 364 <p>See <a class="reference internal" href="#pub-tisci-dkek-notes"><span class="std std-ref">API Notes</span></a> below.</p>
 365 </div>
 366 <div class="section" id="tisci-msg-sa2ul-get-dkek-get-dkek">
 367 <span id="sec-api-sa2ul-get-dkek"></span><h3>TISCI_MSG_SA2UL_GET_DKEK - Get DKEK<a class="headerlink" href="#tisci-msg-sa2ul-get-dkek-get-dkek" title="Permalink to this headline">¶</a></h3>
 368 <p><strong>Usage</strong>:</p>
 369 <table border="1" class="docutils">
 370 <colgroup>
 371 <col width="75%" />
 372 <col width="25%" />
 373 </colgroup>
 374 <tbody valign="top">
 375 <tr class="row-odd"><td><strong>Message Type</strong></td>
 376 <td>Normal</td>
 377 </tr>
 378 <tr class="row-even"><td><strong>Secure Queue Only?</strong></td>
 379 <td>Yes</td>
 380 </tr>
 381 </tbody>
 382 </table>
 383 </div>
 384 <div class="section" id="id2">
 385 <h3>TISCI Message ID<a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h3>
 386 <p><p><code class="docutils literal"><span class="pre">TISCI_MSG_SA2UL_GET_DKEK</span>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; <span class="pre">(0x9029U)</span></code></p>
 387 <p>Message to derive a KEK and return it via TISCI</p>
 388 </p>
 389 <p><code class="docutils literal"><span class="pre">SA2UL_DKEK_KEY_LEN</span>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; <span class="pre">(32U)</span></code></p>
 390 <p><p><strong>struct tisci_msg_sa2ul_get_dkek_req</strong></p>
 391 <p>TISCI Request for getting DKEK via TISCI</p>
 392 <table border="1" class="docutils">
 393 <colgroup>
 394 <col width="13%" />
 395 <col width="12%" />
 396 <col width="75%" />
 397 </colgroup>
 398 <thead valign="bottom">
 399 <tr class="row-odd"><th class="head">Parameter</th>
 400 <th class="head">Type</th>
 401 <th class="head">Description</th>
 402 </tr>
 403 </thead>
 404 <tbody valign="top">
 405 <tr class="row-even"><td>hdr</td>
 406 <td>struct tisci_header</td>
 407 <td>Generic TISCI message header.</td>
 408 </tr>
 409 <tr class="row-odd"><td>sa2ul_instance</td>
 410 <td>u8</td>
 411 <td>SA2UL instance number - set to 0</td>
 412 </tr>
 413 <tr class="row-even"><td>kdf_label_len</td>
 414 <td>u8</td>
 415 <td>Length of “Label” input to KDF</td>
 416 </tr>
 417 <tr class="row-odd"><td>kdf_context_len</td>
 418 <td>u8</td>
 419 <td>Length of “Context” input to KDF</td>
 420 </tr>
 421 <tr class="row-even"><td>kdf_label_and_context</td>
 422 <td>u8</td>
 423 <td>”Label” and “Context” bytes are stored in this array one after another. Maximum length of this field is KDF_LABEL_AND_CONTEXT_LEN_MAX</td>
 424 </tr>
 425 </tbody>
 426 </table>
 427 </p>
 428 <p><p><strong>struct tisci_msg_sa2ul_get_dkek_resp</strong></p>
 429 <p>TISCI Response for requesting DKEK</p>
 430 <table border="1" class="docutils">
 431 <colgroup>
 432 <col width="15%" />
 433 <col width="25%" />
 434 <col width="60%" />
 435 </colgroup>
 436 <thead valign="bottom">
 437 <tr class="row-odd"><th class="head">Parameter</th>
 438 <th class="head">Type</th>
 439 <th class="head">Description</th>
 440 </tr>
 441 </thead>
 442 <tbody valign="top">
 443 <tr class="row-even"><td>hdr</td>
 444 <td>struct tisci_header</td>
 445 <td>Generic TISCI message header.</td>
 446 </tr>
 447 <tr class="row-odd"><td>dkek</td>
 448 <td>u8</td>
 449 <td>Array containing Derived KEK. Length is 32 bytes</td>
 450 </tr>
 451 </tbody>
 452 </table>
 453 </p>
 454 <p>See <a class="reference internal" href="#pub-tisci-dkek-notes"><span class="std std-ref">API Notes</span></a> below.</p>
 455 </div>
 456 <div class="section" id="api-notes">
 457 <span id="pub-tisci-dkek-notes"></span><h3>API Notes<a class="headerlink" href="#api-notes" title="Permalink to this headline">¶</a></h3>
 458 <ul class="simple">
 459 <li>The total length of the Label and Context fields below is limited by the size
 460 of the TISCI messages(see <a class="reference internal" href="../general/TISCI_header.html#pub-secure-msg-header"><span class="std std-ref">Secure Messaging Header</span></a>) to 41 bytes.</li>
 461 <li>System Firmware only support <code class="docutils literal"><span class="pre">sa2ul_instance</span></code> value of 0 in the API below.</li>
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