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<h1 id="Secure and Measured boot on DeveloperBox">Secure and Measured boot on DeveloperBox</h1>
<p>
Posted on Tue 04 January 2022 in <a href="/category/uefi.html">UEFI</a>
• 5 min read
</p>
</header>
<div>
<h6></h6>
<p><link rel="stylesheet" href="overload.css"></p>
<h2><strong>Do I need a TPM?</strong></h2>
<p>I won't go into details regarding why a TPM is useful. There is an excellent
<a href="https://mjg59.dreamwidth.org/57199.html" target="_blank">article</a>
from Matthew Garrett on that, but the short answer is "yes you do".</p>
<h2><strong>U-Boot Support</strong></h2>
<p>There's a spec defining a standard interface to the TPM on an UEFI platform.
It's purpose is to define APIs and provide information, for things like,
is a TPM present, which PCR banks are active, change active PCR banks, obtain the TCG boot log,
extend hashes to PCRs, and append events to the TCG boot log etc.</p>
<p>U-Boot recently got support for this as well as support for the
<a href="https://trustedcomputinggroup.org/wp-content/uploads/TCG_PCClient_PFP_r1p05_v22_02dec2020.pdf" target="_blank">TCG PC Client Platform Firmware Profile</a>.</p>
<p>Patches can be found
<a href="https://lore.kernel.org/u-boot/[email protected]/" target="_blank"> here</a>,
<a href="https://lore.kernel.org/u-boot/[email protected]/" target="_blank">here</a>
and
<a href="https://lore.kernel.org/u-boot/[email protected]/" target="_blank">here</a>.</p>
<p>Finding an Arm device with with a TPMv2 can prove hard. So it would be useful
to emulate that in software. If you have a board with an RPMB and OP-TEE support,
I suggest you try Microsoft's <a href="https://github.com/microsoft/ms-tpm-20-ref/" target="_blank">fTPM</a>.
However testing that in QEMU won't work since it lacks RPMB emulation. Luckily
there's another solution.</p>
<h2><strong>Using SWTPM</strong></h2>
<p><a href="https://github.com/stefanberger/swtpm" target="_blank">SWTPM</a> is a
TPM emulator that works under QEMU. It provides a memory mapped device which
adheres to the <a href="https://trustedcomputinggroup.org/wp-content/uploads/TCG_PCClientTPMInterfaceSpecification_TIS__1-3_27_03212013.pdf" target="_blank">TCG TPM Interface Specification</a>.
The problem is that U-Boot had no support for memory mapped TPMs, which is
exactly what <a href="https://lore.kernel.org/u-boot/[email protected]/" target="_blank">this</a> patchset does.</p>
<h3><strong>Building U-Boot</strong></h3>
<p>At the time of this article the U-Boot patches are under review, so we need to
apply them manually.</p>
<p>So download the patches prepare your U-Boot binary.</p>
<div class="highlight"><pre><span></span><code>git clone https://github.com/u-boot/u-boot.git
<span class="nb">pushd</span> u-boot
git am <patches <span class="k">for</span> mmio tpm support>
make qemu_arm64_defconfig
make menuconfig
</code></pre></div>
<p>We need to enable the TPMv2 support in U-Boot
<code>CONFIG_TPM</code>, <code>CONFIG_CMD_TPM</code>, <code>CONFIG_TPM2_MMIO</code> must be enabled. Once
those are selected <code>CONFIG_EFI_TCG2_PROTOCOL</code> should be automatically included.
Make sure you enable <code>CONFIG_CMD_EFIDEBUG</code>, since we will need it to boot our
kernel.</p>
<div class="highlight"><pre><span></span><code>make -j <span class="k">$(</span>nproc<span class="k">)</span>
<span class="nb">popd</span>
</code></pre></div>
<h3><strong>Running QEMU</strong></h3>
<p>Make sure swtpm is installed and running on your system. For debian and friends
there's a swtpm package, so just do </p>
<div class="highlight"><pre><span></span><code>sudo apt install swtpm
mkdir /tmp/mytpm1
swtpm socket --tpmstate <span class="nv">dir</span><span class="o">=</span>/tmp/mytpm1 <span class="se">\</span>
--ctrl <span class="nv">type</span><span class="o">=</span>unixio,path<span class="o">=</span>/tmp/mytpm1/swtpm-sock <span class="se">\</span>
--log <span class="nv">level</span><span class="o">=</span><span class="m">40</span> --tpm2 <span class="p">&</span>
</code></pre></div>
<p>and launch QEMU with swtpm support</p>
<div class="highlight"><pre><span></span><code>sudo qemu-system-aarch64 <span class="se">\</span>
-bios u-boot.bin <span class="se">\</span>
-machine virt,gic-version<span class="o">=</span><span class="m">3</span>,accel<span class="o">=</span>kvm <span class="se">\</span>
-cpu host -m 4G <span class="se">\</span>
-nographic -no-acpi <span class="se">\</span>
-chardev socket,id<span class="o">=</span>chrtpm,path<span class="o">=</span>/tmp/mytpm1/swtpm-sock <span class="se">\</span>
-tpmdev emulator,id<span class="o">=</span>tpm0,chardev<span class="o">=</span>chrtpm <span class="se">\</span>
-device tpm-tis-device,tpmdev<span class="o">=</span>tpm0 <span class="se">\</span>
-drive <span class="nv">id</span><span class="o">=</span>disk0,file<span class="o">=</span>rootfs-linaro-buster-raw-unknown-20200720-440.ext4,if<span class="o">=</span>none,format<span class="o">=</span>raw <span class="se">\</span>
-device virtio-blk-device,drive<span class="o">=</span>disk0
</code></pre></div>
<h3><strong>Booting linux</strong></h3>
<p>From U-Boot's command line do something along the lines of</p>
<div class="highlight"><pre><span></span><code>tpm2 startup TPM2_SU_CLEAR <span class="o">&&</span> virtio scan
efidebug boot add -b ABE0 <span class="s1">'kernel'</span> virtio <span class="m">0</span> boot/Image -s <span class="s1">'root=/dev/vda'</span>
efidebug boot order ABE0
bootefi bootmgr
</code></pre></div>
<p>If everything is compiled and launched correctly, you should see the kernel
reporting the location of some related EventLog pointers.</p>
<div class="highlight"><pre><span></span><code><span class="go">efi: EFI v2.80 by Das U-Boot</span>
<span class="go">efi: TPMFinalLog=0x13ddcc040 RTPROP=0x13ddcb040 SMBIOS=0xffffe000 TPMEventLog=0x13ddc4040 MEMRESERVE=0x13ddc3040 </span>
</code></pre></div>
<h3><strong>Reading the EventLog</strong></h3>
<p>I am using a debian .ext4 image, where I have installed the latest tpm2 tools.
If you don't have them install them with</p>
<div class="highlight"><pre><span></span><code>sudo apt install tpm2-tools
</code></pre></div>
<p>The kernel exposes the eventlog in /sys. So you can read it with:</p>
<div class="highlight"><pre><span></span><code><span class="n">tpm2_eventlog</span> <span class="sr">/sys/</span><span class="n">kernel</span><span class="o">/</span><span class="n">security</span><span class="o">/</span><span class="n">tpm0</span><span class="o">/</span><span class="n">binary_bios_measurements</span>
<span class="o">---</span>
<span class="ss">events</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">0</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">0</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_NO_ACTION</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"0000000000000000000000000000000000000000"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">37</span>
<span class="ss">SpecID</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">Signature</span><span class="p">:</span> <span class="no">Spec</span> <span class="no">ID</span> <span class="no">Event03</span>
<span class="ss">platformClass</span><span class="p">:</span> <span class="mi">0</span>
<span class="ss">specVersionMinor</span><span class="p">:</span> <span class="mi">0</span>
<span class="ss">specVersionMajor</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">specErrata</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">uintnSize</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">numberOfAlgorithms</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Algorithms</span><span class="p">:</span>
<span class="o">-</span> <span class="no">Algorithm</span><span class="o">[</span><span class="mi">0</span><span class="o">]</span><span class="p">:</span>
<span class="ss">algorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">digestSize</span><span class="p">:</span> <span class="mi">20</span>
<span class="o">-</span> <span class="no">Algorithm</span><span class="o">[</span><span class="mi">1</span><span class="o">]</span><span class="p">:</span>
<span class="ss">algorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">digestSize</span><span class="p">:</span> <span class="mi">32</span>
<span class="ss">vendorInfoSize</span><span class="p">:</span> <span class="mi">0</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">1</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">0</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_S_CRTM_VERSION</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"0772fd675fbebcdd4401008ee8d609760c1675df"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"69f66450f9a8780cf2fbab358d46b8fabd4b7e9ae886b3d80083646c30e91b4c"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">74</span>
<span class="ss">Event</span><span class="p">:</span> <span class="s2">"552d426f6f7420323032312e31302d7263322d30303031302d67643536666231666138352d646972747920284175672032342032303231202d2030363a33343a3335202b303830302900"</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">7</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_EFI_VARIABLE_DRIVER_CONFIG</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"57cd4dc19442475aa82743484f3b1caa88e142b8"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"115aa827dbccfb44d216ad9ecfda56bdea620b860a94bed5b7a27bba1c4d02d8"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">53</span>
<span class="ss">Event</span><span class="p">:</span>
<span class="ss">VariableName</span><span class="p">:</span> <span class="mi">61</span><span class="n">dfe48b</span><span class="o">-</span><span class="n">ca93</span><span class="o">-</span><span class="n">d211</span><span class="o">-</span><span class="n">aa0d</span><span class="o">-</span><span class="mo">00</span><span class="n">e098032b8c</span>
<span class="ss">UnicodeNameLength</span><span class="p">:</span> <span class="mi">10</span>
<span class="ss">VariableDataLength</span><span class="p">:</span> <span class="mi">1</span>
<span class="ss">UnicodeName</span><span class="p">:</span> <span class="no">SecureBoot</span>
<span class="ss">VariableData</span><span class="p">:</span> <span class="s2">"00"</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">3</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">7</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_EFI_VARIABLE_DRIVER_CONFIG</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"9b1387306ebb7ff8e795e7be77563666bbf4516e"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"dea7b80ab53a3daaa24d5cc46c64e1fa9ffd03739f90aadbd8c0867c4a5b4890"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">36</span>
<span class="ss">Event</span><span class="p">:</span>
<span class="ss">VariableName</span><span class="p">:</span> <span class="mi">61</span><span class="n">dfe48b</span><span class="o">-</span><span class="n">ca93</span><span class="o">-</span><span class="n">d211</span><span class="o">-</span><span class="n">aa0d</span><span class="o">-</span><span class="mo">00</span><span class="n">e098032b8c</span>
<span class="ss">UnicodeNameLength</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">VariableDataLength</span><span class="p">:</span> <span class="mi">0</span>
<span class="ss">UnicodeName</span><span class="p">:</span> <span class="no">PK</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">4</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">7</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_EFI_VARIABLE_DRIVER_CONFIG</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"9afa86c507419b8570c62167cb9486d9fc809758"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"e670e121fcebd473b8bc41bb801301fc1d9afa33904f06f7149b74f12c47a68f"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">38</span>
<span class="ss">Event</span><span class="p">:</span>
<span class="ss">VariableName</span><span class="p">:</span> <span class="mi">61</span><span class="n">dfe48b</span><span class="o">-</span><span class="n">ca93</span><span class="o">-</span><span class="n">d211</span><span class="o">-</span><span class="n">aa0d</span><span class="o">-</span><span class="mo">00</span><span class="n">e098032b8c</span>
<span class="ss">UnicodeNameLength</span><span class="p">:</span> <span class="mi">3</span>
<span class="ss">VariableDataLength</span><span class="p">:</span> <span class="mi">0</span>
<span class="ss">UnicodeName</span><span class="p">:</span> <span class="no">KEK</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">5</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">7</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_EFI_VARIABLE_DRIVER_CONFIG</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"5bf8faa078d40ffbd03317c93398b01229a0e1e0"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"baf89a3ccace52750c5f0128351e0422a41597a1adfd50822aa363b9d124ea7c"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">36</span>
<span class="ss">Event</span><span class="p">:</span>
<span class="ss">VariableName</span><span class="p">:</span> <span class="n">cbb219d7</span><span class="o">-</span><span class="mi">3</span><span class="n">a3d</span><span class="o">-</span><span class="mi">9645</span><span class="o">-</span><span class="n">a3bc</span><span class="o">-</span><span class="n">dad00e67656f</span>
<span class="ss">UnicodeNameLength</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">VariableDataLength</span><span class="p">:</span> <span class="mi">0</span>
<span class="ss">UnicodeName</span><span class="p">:</span> <span class="n">db</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">6</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">7</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_EFI_VARIABLE_DRIVER_CONFIG</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"734424c9fe8fc71716c42096f4b74c88733b175e"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"9f75b6823bff6af1024a4e2036719cdd548d3cbc2bf1de8e7ef4d0ed01f94bf9"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">38</span>
<span class="ss">Event</span><span class="p">:</span>
<span class="ss">VariableName</span><span class="p">:</span> <span class="n">cbb219d7</span><span class="o">-</span><span class="mi">3</span><span class="n">a3d</span><span class="o">-</span><span class="mi">9645</span><span class="o">-</span><span class="n">a3bc</span><span class="o">-</span><span class="n">dad00e67656f</span>
<span class="ss">UnicodeNameLength</span><span class="p">:</span> <span class="mi">3</span>
<span class="ss">VariableDataLength</span><span class="p">:</span> <span class="mi">0</span>
<span class="ss">UnicodeName</span><span class="p">:</span> <span class="n">dbx</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">7</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">4</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_EFI_BOOT_SERVICES_APPLICATION</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"d2702383b2e042ebefbb318f9382fd094c1c2d6b"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"8fb6a4c7a0c7e7f22b944906eb07786cd3860394c7929e7c0768b2c99a2a3d87"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">162</span>
<span class="ss">Event</span><span class="p">:</span>
<span class="ss">ImageLocationInMemory</span><span class="p">:</span> <span class="mh">0x7adb3000</span>
<span class="ss">ImageLengthInMemory</span><span class="p">:</span> <span class="mi">893720</span>
<span class="ss">ImageLinkTimeAddress</span><span class="p">:</span> <span class="mh">0x0</span>
<span class="ss">LengthOfDevicePath</span><span class="p">:</span> <span class="mi">130</span>
<span class="ss">DevicePath</span><span class="p">:</span> <span class="s2">"01041400b9731de684a3cc4aaeab82e828f3628b031d050002031d05000104012a0001000000009800000000000000f805000000000050641c65888b6b418f2257061a9dc3c50202040436005c004500460049005c00640065006200690061006e005c007300680069006d0061006100360034002e0065006600690000007fff0400"</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">8</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">1</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">Unknown</span> <span class="n">event</span> <span class="n">type</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"50eb6bd100c48e81644d666a437725f49c6aed3c"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"eb881b78feeb95756141a8d5358b891b297fad61b296f667de1f59b66bc92f4f"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">52</span>
<span class="ss">Event</span><span class="p">:</span> <span class="s2">"61dfe48bca93d211aa0d00e098032b8c0900000000000000020000000000000042006f006f0074004f0072006400650072000000"</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">9</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">1</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">Unknown</span> <span class="n">event</span> <span class="n">type</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"74e29a0674816dfdfc2c2e9cbbcec357132da4e8"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"5d123811f51e2e46c437c7e88e07053c81f4e63da3f11de8a8a2afb5334db137"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">198</span>
<span class="ss">Event</span><span class="p">:</span> <span class="s2">"61dfe48bca93d211aa0d00e098032b8c0800000000000000960000000000000042006f006f0074003000300030003000010000008200640065006200690061006e00000001041400b9731de684a3cc4aaeab82e828f3628b031d050002031d05000104012a0001000000009800000000000000f805000000000050641c65888b6b418f2257061a9dc3c50202040436005c004500460049005c00640065006200690061006e005c007300680069006d0061006100360034002e0065006600690000007fff0400"</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">10</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">4</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_EFI_ACTION</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"cd0fdb4531a6ec41be2753ba042637d6e5f7f256"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"3d6772b4f84ed47595d72a2c4c5ffd15f5bb72c7507fe26f2aaee2c69d5633ba"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">40</span>
<span class="ss">Event</span><span class="p">:</span> <span class="s1">'Calling EFI Application from Boot Option'</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">11</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">0</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_SEPARATOR</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"9069ca78e7450a285173431b3e52c5c25299e473"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"df3f619804a92fdb4057192dc43dd748ea778adc52bc498ce80524c014b81119"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">4</span>
<span class="ss">Event</span><span class="p">:</span> <span class="s2">"00000000"</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">12</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">1</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_SEPARATOR</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"9069ca78e7450a285173431b3e52c5c25299e473"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"df3f619804a92fdb4057192dc43dd748ea778adc52bc498ce80524c014b81119"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">4</span>
<span class="ss">Event</span><span class="p">:</span> <span class="s2">"00000000"</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">13</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_SEPARATOR</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"9069ca78e7450a285173431b3e52c5c25299e473"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"df3f619804a92fdb4057192dc43dd748ea778adc52bc498ce80524c014b81119"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">4</span>
<span class="ss">Event</span><span class="p">:</span> <span class="s2">"00000000"</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">14</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">3</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_SEPARATOR</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"9069ca78e7450a285173431b3e52c5c25299e473"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"df3f619804a92fdb4057192dc43dd748ea778adc52bc498ce80524c014b81119"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">4</span>
<span class="ss">Event</span><span class="p">:</span> <span class="s2">"00000000"</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">15</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">4</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_SEPARATOR</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"9069ca78e7450a285173431b3e52c5c25299e473"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"df3f619804a92fdb4057192dc43dd748ea778adc52bc498ce80524c014b81119"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">4</span>
<span class="ss">Event</span><span class="p">:</span> <span class="s2">"00000000"</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">16</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">5</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_SEPARATOR</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"9069ca78e7450a285173431b3e52c5c25299e473"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"df3f619804a92fdb4057192dc43dd748ea778adc52bc498ce80524c014b81119"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">4</span>
<span class="ss">Event</span><span class="p">:</span> <span class="s2">"00000000"</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">17</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">6</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_SEPARATOR</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"9069ca78e7450a285173431b3e52c5c25299e473"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"df3f619804a92fdb4057192dc43dd748ea778adc52bc498ce80524c014b81119"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">4</span>
<span class="ss">Event</span><span class="p">:</span> <span class="s2">"00000000"</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">18</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">7</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_SEPARATOR</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"9069ca78e7450a285173431b3e52c5c25299e473"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"df3f619804a92fdb4057192dc43dd748ea778adc52bc498ce80524c014b81119"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">4</span>
<span class="ss">Event</span><span class="p">:</span> <span class="s2">"00000000"</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">19</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">5</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_EFI_ACTION</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"443a6b7b82b7af564f2e393cd9d5a388b7fa4a98"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"d8043d6b7b85ad358eb3b6ae6a873ab7ef23a26352c5dc4faa5aeedacf5eb41b"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">29</span>
<span class="ss">Event</span><span class="p">:</span> <span class="s1">'Exit Boot Services Invocation'</span>
<span class="o">-</span> <span class="ss">EventNum</span><span class="p">:</span> <span class="mi">20</span>
<span class="ss">PCRIndex</span><span class="p">:</span> <span class="mi">5</span>
<span class="ss">EventType</span><span class="p">:</span> <span class="no">EV_EFI_ACTION</span>
<span class="ss">DigestCount</span><span class="p">:</span> <span class="mi">2</span>
<span class="ss">Digests</span><span class="p">:</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha1</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"475545ddc978d7bfd036facc7e2e987f48189f0d"</span>
<span class="o">-</span> <span class="ss">AlgorithmId</span><span class="p">:</span> <span class="n">sha256</span>
<span class="ss">Digest</span><span class="p">:</span> <span class="s2">"b54f7542cbd872a81a9d9dea839b2b8d747c7ebd5ea6615c40f42f44a6dbeba0"</span>
<span class="ss">EventSize</span><span class="p">:</span> <span class="mi">40</span>
<span class="ss">Event</span><span class="p">:</span> <span class="s1">'Exit Boot Services Returned with Success'</span>
<span class="ss">pcrs</span><span class="p">:</span>
<span class="ss">sha1</span><span class="p">:</span>
<span class="mi">0</span> <span class="p">:</span> <span class="mh">0x3e26be54f5f15140afbe509cc4580538d979598d</span>
<span class="mi">1</span> <span class="p">:</span> <span class="mh">0x5b4c188c39baa249f688460a63b68df6d3d3ec94</span>
<span class="mi">2</span> <span class="p">:</span> <span class="mh">0xb2a83b0ebf2f8374299a5b2bdfc31ea955ad7236</span>
<span class="mi">3</span> <span class="p">:</span> <span class="mh">0xb2a83b0ebf2f8374299a5b2bdfc31ea955ad7236</span>
<span class="mi">4</span> <span class="p">:</span> <span class="mh">0x260ae65533f38ab643f157bd176c72f9fdece410</span>
<span class="mi">5</span> <span class="p">:</span> <span class="mh">0xd16d7e629fd8d08ca256f9ad3a3a1587c9e6cc1b</span>
<span class="mi">6</span> <span class="p">:</span> <span class="mh">0xb2a83b0ebf2f8374299a5b2bdfc31ea955ad7236</span>
<span class="mi">7</span> <span class="p">:</span> <span class="mh">0x518bd167271fbb64589c61e43d8c0165861431d8</span>
<span class="ss">sha256</span><span class="p">:</span>
<span class="mi">0</span> <span class="p">:</span> <span class="mh">0x7f35c1ef1bb7b9d2aee58ec4c36cf384d70524c2ce2b6801772d7fdb1d2b5f5a</span>
<span class="mi">1</span> <span class="p">:</span> <span class="mh">0xf35b74319598e48a6a69a6a04e903a872558b891563b0af23c877c8472c277a6</span>
<span class="mi">2</span> <span class="p">:</span> <span class="mh">0x3d458cfe55cc03ea1f443f1562beec8df51c75e14a9fcf9a7234a13f198e7969</span>
<span class="mi">3</span> <span class="p">:</span> <span class="mh">0x3d458cfe55cc03ea1f443f1562beec8df51c75e14a9fcf9a7234a13f198e7969</span>
<span class="mi">4</span> <span class="p">:</span> <span class="mh">0xbe4d7464e3a3c0a04040355368006a5fbe02c0ef232c8c18926df9b718374f36</span>
<span class="mi">5</span> <span class="p">:</span> <span class="mh">0xa5ceb755d043f32431d63e39f5161464620a3437280494b5850dc1b47cc074e0</span>
<span class="mi">6</span> <span class="p">:</span> <span class="mh">0x3d458cfe55cc03ea1f443f1562beec8df51c75e14a9fcf9a7234a13f198e7969</span>
<span class="mi">7</span> <span class="p">:</span> <span class="mh">0x65caf8dd1e0ea7a6347b635d2b379c93b9a1351edc2afc3ecda700e534eb3068</span>
</code></pre></div>
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