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| <span class="navbar-text navbar-version pull-left"><b>v03.00.05</b></span> |
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| <li class="toctree-l1"><a class="reference internal" href="../../../index.html">1. NXP Plug & Trust Middleware</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="../../../organization-of-documentation.html">1.1. Organization of Documentation</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../folder-structure.html">1.2. Folder Structure</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../sw-prerequisites.html">1.3. List of Platform Prerequisites</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../changes/index.html">2. Changes</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/pending.html">2.1. Pending Refactoring items</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/pending.html#known-limitations">2.2. Known limitations</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v03_00_05.html">2.3. Release <code class="docutils literal notranslate"><span class="pre">v03.00.05</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v03_00_04.html">2.4. Release <code class="docutils literal notranslate"><span class="pre">v03.00.04</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v03_00_03.html">2.5. Release <code class="docutils literal notranslate"><span class="pre">v03.00.03</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v03_00_02.html">2.6. Release <code class="docutils literal notranslate"><span class="pre">v03.00.02</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_16_01.html">2.7. Release <code class="docutils literal notranslate"><span class="pre">v02.16.01</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_16_00.html">2.8. Release <code class="docutils literal notranslate"><span class="pre">v02.16.00</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_15_00.html">2.9. Release <code class="docutils literal notranslate"><span class="pre">v02.15.00</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_14_00.html">2.10. Release <code class="docutils literal notranslate"><span class="pre">v02.14.00</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_12_00.html">2.11. Release <code class="docutils literal notranslate"><span class="pre">v02.12.05</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_12_00.html#release-v02-12-04">2.12. Release <code class="docutils literal notranslate"><span class="pre">v02.12.04</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_12_00.html#release-v02-12-03">2.13. Release <code class="docutils literal notranslate"><span class="pre">v02.12.03</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_12_00.html#release-v02-12-02">2.14. Release <code class="docutils literal notranslate"><span class="pre">v02.12.02</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_12_00.html#release-v02-12-01">2.15. Release <code class="docutils literal notranslate"><span class="pre">v02.12.01</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_12_00.html#release-v02-12-00">2.16. Release <code class="docutils literal notranslate"><span class="pre">v02.12.00</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_11_03.html">2.17. Release <code class="docutils literal notranslate"><span class="pre">v02.11.03</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_11_01.html">2.18. Internal Release <code class="docutils literal notranslate"><span class="pre">v02.11.01</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_11_00.html">2.19. Release <code class="docutils literal notranslate"><span class="pre">v02.11.00</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_10_00.html">2.20. Release <code class="docutils literal notranslate"><span class="pre">v02.10.00</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_09_00.html">2.21. Release <code class="docutils literal notranslate"><span class="pre">v02.09.00</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_07_00.html">2.22. Release <code class="docutils literal notranslate"><span class="pre">v02.07.00</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_06_00.html">2.23. Release <code class="docutils literal notranslate"><span class="pre">v02.06.00</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_05_00_to_v02_03_00.html">2.24. Release <code class="docutils literal notranslate"><span class="pre">v02.05.00</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_05_00_to_v02_03_00.html#release-v02-04-00">2.25. Release <code class="docutils literal notranslate"><span class="pre">v02.04.00</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../changes/v02_05_00_to_v02_03_00.html#release-02-03-00">2.26. Release <code class="docutils literal notranslate"><span class="pre">02.03.00</span></code></a></li> |
| </ul> |
| </li> |
| <li class="toctree-l1 current"><a class="reference internal" href="../../../stack/index.html">3. Plug & Trust MW Stack</a><ul class="current"> |
| <li class="toctree-l2"><a class="reference internal" href="../../../stack/features.html">3.1. Features</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../stack/features.html#plug-trust-mw-block-diagram">3.2. Plug & Trust MW : Block Diagram</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../sss-apis.html">3.3. SSS APIs</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../stack/se05xfeatures.html">3.4. SSS APIs: SE051 vs SE050</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../stack/param_checks.html">3.5. Parameter Check & Conventions</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../stack/i2cm.html">3.6. I2CM / Secure Sensor</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../stack/logging.html">3.7. Logging</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../stack/feature-file.html">3.8. Feature File - <code class="docutils literal notranslate"><span class="pre">fsl_sss_ftr.h</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../stack/platf-scp-from-fs.html">3.9. Using Platform SCP Keys from File System</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../stack/auth/auth-objects.html">3.10. Auth Objects</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../stack/auth/auth-objects-userid.html">3.11. Auth Objects : UserID</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../stack/auth/auth-objects-aeskey.html">3.12. Auth Objects : AESKey</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../stack/auth/auth-objects-eckey.html">3.13. Auth Objects : ECKey</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../stack/key-id-range.html">3.14. Key Id Range and Purpose</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../stack/key-id-range.html#authentication-keys">3.15. Authentication Keys</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../stack/key-id-range.html#trust-provisioned-keyids">3.16. Trust provisioned KeyIDs</a></li> |
| <li class="toctree-l2 current"><a class="current reference internal" href="#">3.17. SCP03 with PUF</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../doc/sss_heap_management.html">3.18. SSS Heap Management</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../building/index.html">4. Building / Compiling</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="../../../building/windows.html">4.1. Windows Build</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../building/frdm-k64f-sdk.html">4.2. Import MCUXPresso projects from SDK</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../building/frdm-k64f-cmake.html">4.3. Freedom K64F Build (CMake - Advanced)</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../building/imx6.html">4.4. i.MX Linux Build</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../building/rpi3.html">4.5. Raspberry Pi Build</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../building/cmake.html">4.6. CMake</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../scripts/cmake_options.html">4.7. CMake Options</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../demos/index.html">5. Demo and Examples</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="../../../demos/index.html#demo-list">5.1. Demo List</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../demos/index.html#sss-api-examples">5.2. SSS API Examples</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../demos/index.html#cloud-demos">5.3. Cloud Demos</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../demos/index.html#linux-specific-demos">5.4. Linux Specific Demos</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../demos/index.html#opc-ua-example">5.5. OPC-UA Example</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../demos/index.html#arm-psa-example">5.6. ARM PSA Example</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../demos/index.html#se05x-examples">5.7. SE05X Examples</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../demos/index.html#openssl-examples">5.8. OpenSSL Examples</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../demos/index.html#tests-for-user-crypto">5.9. Tests for User Crypto</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../demos/index.html#nxpnfcrdlib-examples">5.10. NXPNFCRDLIB examples</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../demos/index.html#ease-of-use-examples">5.11. Ease-of-Use examples</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../demos/index.html#semslite-examples">5.12. Semslite examples</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../demos/index.html#puf-examples">5.13. PUF examples</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../edgelock2go-agent.html">6. NXP EdgeLock 2GO Agent</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="../../../nxp_iot_agent/doc/introduction.html">6.1. Introduction</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../nxp_iot_agent/doc/introduction.html#building-and-running-the-edgelock-2go-agent">6.2. Building and running the EdgeLock 2GO agent</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../nxp_iot_agent/doc/introduction.html#datastore-keystore">6.3. Datastore / Keystore</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../nxp_iot_agent/doc/introduction.html#connection-to-the-edgelock-2go-cloud-service">6.4. Connection to the EdgeLock 2GO cloud service</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../nxp_iot_agent/doc/introduction.html#claim-codes">6.5. Claim Codes</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../nxp_iot_agent/doc/edgelock2go_agent_apis.html">6.6. API</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../nxp_iot_agent/doc/readme_usage_examples.html">6.7. Usage Examples</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../semslite/doc/index.html">7. SEMS Lite Agent</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="../../../semslite/doc/sems_lite_overview.html">7.1. SEMS Lite Overview (Only for SE051)</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../semslite/doc/sems_lite_package.html">7.2. Update Package</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../semslite/doc/sems_lite_usage.html">7.3. SEMS Lite Agent Usage</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../semslite/doc/sems_lite_mgmt_api.html">7.4. SEMS Lite management APIs</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../semslite/doc/sems_lite_process.html">7.5. SEMS Lite Agent Package Load Process</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../semslite/doc/sems_lite_api.html">7.6. APIs</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../semslite/doc/sems_lite_known_issue.html">7.7. SEMS Lite Known Issue</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../semslite/doc/demo_update.html">7.8. SEMS Lite DEMOs</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../plugins/index.html">8. Plugins / Add-ins</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="../../plugin/openssl/scripts/readme.html">8.1. Introduction on OpenSSL engine</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../plugin/mbedtls/scripts/readme.html">8.2. Introduction on mbedTLS ALT Implementation</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../plugin/psa/Readme.html">8.3. Platform Security Architecture</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../plugins/akm.html">8.4. Android Key master</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../plugin/open62541/readme.html">8.5. Introduction on Open62541 (OPC UA stack)</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../plugins/wifiEAP/wifiEAP.html">8.6. WiFi EAP Demo with Raspberry Pi3</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../plugins/pkcs11.html">8.7. PKCS#11 Standalone Library</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../cli-tool.html">9. CLI Tool</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="../../../pycli/doc/introduction.html">9.1. Introduction</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../pycli/doc/block-diagram.html">9.2. Block Diagram</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../pycli/doc/pre-steps.html">9.3. Steps needed before running <code class="docutils literal notranslate"><span class="pre">ssscli</span></code> tool</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../pycli/doc/running.html">9.4. Running the <code class="docutils literal notranslate"><span class="pre">ssscli</span></code> tool - Windows</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../pycli/Provisioning/readme.html">9.5. CLI Provisioning</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../pycli/doc/readme_usage_examples.html">9.6. Usage Examples</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../pycli/doc/cli_commands_list.html">9.7. List of <code class="docutils literal notranslate"><span class="pre">ssscli</span></code> commands</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../pycli/doc/cli_data_format.html">9.8. CLI Data formats</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../pycli/doc/cli_object_policy.html">9.9. Object Policies Through ssscli</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../appendix/upload_se05x_using_pycli.html">9.10. Upload keys and certificates to SE05X using ssscli tool</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../a71ch.html">10. A71CH</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="../../../a71ch/a71ch_sss.html">10.1. A71CH and SSS API</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../a71ch/a71ch_miscellaneous.html">10.2. Miscellaneous</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../a71ch/a71ch_legacy_host_api.html">10.3. A71CH Legacy API</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../a71ch/a71ch_legacy_hlse_api.html">10.4. A71CH Legacy HLSE (Generic) API</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../a71ch/a71ch_configure_tool.html">10.5. A71CH Legacy Configure Tool</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="../../../appendix.html">11. Appendix</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="../../../appendix/glossary.html">11.1. Glossary</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../appendix/vcom.html">11.2. APDU Commands over VCOM</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../appendix/vs2019-setup.html">11.3. Visual Studio 2019 Setup</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../appendix/ide_mcux.html">11.4. Setting up MCUXPresso IDE</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../dev-platforms.html">11.5. Development Platforms</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../appendix/se_uid.html">11.6. How to get SE Platform Information and UID</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../appendix/version_info.html">11.7. Version Information</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../demos/Certificate_Chains/Readme.html">11.8. Certificate Chains</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../appendix/rjct_server.html">11.9. JRCP_v1 Server</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../appendix/platfscp.html">11.10. Using own Platform SCP03 Keys</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../appendix/apdu_write_to_buffer.html">11.11. Write APDU to buffer</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../../../api/api_list.html">11.12. Plug & Trust MW APIs</a></li> |
| </ul> |
| </li> |
| </ul> |
| </ul> |
| </li> |
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| <div class="section" id="scp03-with-puf"> |
| <span id="puf-scp03"></span><h1><span class="section-number">3.17. </span>SCP03 with PUF<a class="headerlink" href="#scp03-with-puf" title="Permalink to this headline">¶</a></h1> |
| <p>To keep Platform SCP03 keys secure, we can use PUF on LPC55S. |
| PUF will have the actual keys stored and we can perform |
| cryptographic operations with it using HashCrypt block. The |
| keys cannot be read out of PUF.</p> |
| <div class="section" id="activation-code"> |
| <h2><span class="section-number">3.17.1. </span>Activation Code<a class="headerlink" href="#activation-code" title="Permalink to this headline">¶</a></h2> |
| <p>The Activation Code (AC) is a 1192-byte code used to start |
| PUF. The AC is generated during <code class="docutils literal notranslate"><span class="pre">PUF_Enroll</span></code> operation. |
| This must be generated once for the lifetime of the device |
| and stored in PFR region of flash.</p> |
| <p>Each PUF has a different AC and cannot be used with any |
| other device.</p> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>For testing, we use pre-compiled activation code from |
| <code class="file docutils literal notranslate"><span class="pre">ex_scp03_puf.h</span></code> instead of reading from PFR. In actual |
| use case, it <strong>MUST</strong> be stored and read from PFR.</p> |
| </div> |
| </div> |
| <div class="section" id="key-code"> |
| <h2><span class="section-number">3.17.2. </span>Key Code<a class="headerlink" href="#key-code" title="Permalink to this headline">¶</a></h2> |
| <p>For every key stored in PUF, we get a Key Code (KC) which |
| is used to access the key. Hardware keys stored in PUF |
| cannot be exported. SCP03 keys must be stored as hardware |
| keys.</p> |
| </div> |
| <div class="section" id="using-with-lpc55s"> |
| <h2><span class="section-number">3.17.3. </span>Using with LPC55S<a class="headerlink" href="#using-with-lpc55s" title="Permalink to this headline">¶</a></h2> |
| <p>PUF is integrated with <a class="reference internal" href="../../../api/function_group__sss__session_1ga8b84f4a638c23f939ccba49e2002cb83.html#_CPPv416sss_session_openP13sss_session_t10sss_type_t8uint32_t21sss_connection_type_tPv" title="sss_session_open"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">sss_session_open()</span></code></a> on LPC55S. |
| Use the following CMake configurations to compile with PUF |
| on LPC55S:</p> |
| <ul class="simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">Host=lpcxpresso55s_s</span></code></p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">SCP=SCP03_SSS</span></code></p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">SE05X_Auth=PlatfSCP03</span></code></p></li> |
| </ul> |
| <p>When we compile any application on LPC55S secure zone, it will |
| try to read HW keys provisioned in PUF. If in case the keys are |
| not provisioned in PUF, the implementation will fallback on software |
| implementation.</p> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>You need to pass keyCodes in connectionData to <code class="docutils literal notranslate"><span class="pre">sss_session_open</span></code> |
| instead of actual keys provisioned in PUF.</p> |
| </div> |
| <p>Only the static SCP03 keys are injected inside the PUF. Dynamic keys |
| are derived from the static keys using CMAC operations with Hashcrypt |
| module.</p> |
| <p>For example on how to enroll PUF and store SCP03 keys, refer <a class="reference internal" href="../../../demos/lpc55s/ex/puf_inject_scp03/Readme.html#puf-inject-scp03"><span class="std std-ref">Key Injection to PUF</span></a>.</p> |
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