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<h1>STM32 firmware for Cryptech Alpha board</h1>

<p>The Alpha board is our first full prototype for an open-source hardware
security module (HSM). It is a custom board with an STM32 Cortex-M4
microcontroller and an Artix-7 FPGA, flash-based keystore, separate memory
for the Key Encryption Key, etc. See the wiki for design documents.</p>

<h1>Copyrights</h1>

<p>The license for all work done on this in the CrypTech project is a
3-clause BSD license.</p>

<p>The "Noise generator" and "Amplifier" parts of the circuit diagram are
copied from Benedikt Stockebrand's ARRGH project. </p>

<p>Both copyright statements are included in LICENSE.txt.</p>

<h1>Board Revisions</h1>

<ol>
<li><p><code>rev01</code> was the "dev-bridge" board, a daughterboard for the Novena,
which talked to the Novena's FPGA through the high-speed expansion
connector.</p></li>
<li><p><code>rev02</code> is the Alpha board, our first full prototype for an open-source
hardware security module (HSM). It is a custom board with an STM32
Cortex-M4 microcontroller and an Artix-7 FPGA, flash-based keystore,
separate memory for the Key Encryption Key, etc.</p>

<p>The board's form factor (4 x 4 in, 101.6 x 101.6 mm) was based on the
Intel NUC mini-PC, but there were some issues sourcing enough cases, so
only a few of these boards were made.</p></li>
<li><p><code>rev03</code> is functionally the same as <code>rev02</code>, but in a Eurocard form
factor (100 x 120 mm, aka "3Ux120").</p></li>
</ol>
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