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<title>
lib1305: Intro</title>
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lib1305</div>
<div class="navt here">Intro
</div><div class="navt away"><a href=download.html>Download</a>
</div><div class="navt away"><a href=install.html>Install</a>
</div><div class="navt away"><a href=test.html>Test</a>
</div><div class="navt away"><a href=api.html>API</a>
</div><div class="navt away"><a href=security.html>Security</a>
</div><div class="navt away"><a href=speed.html>Speed</a>
</div><div class="navt away"><a href=internals.html>Internals</a>
</div><div class="navt away"><a href=people.html>People</a>
</div><div class="navt away"><a href=license.html>License</a>
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<div class=pagetitle>lib1305: Intro</div>
<p>lib1305 is a microlibrary for the
Poly1305 one-time authenticator.</p>
<p>lib1305 has a very simple stateless <a href="api.html">API</a>
based on the SUPERCOP API,
with wire-format inputs and outputs,
providing a function
<code>poly1305</code> to generate an authenticator
and a function
<code>poly1305_verify</code> to verify an authenticator.</p>
<p>Internally,
lib1305 includes implementations designed to work portably across CPUs,
and implementations designed for <a href="speed.html">higher performance</a>
on Intel/AMD CPUs with BMI2 instructions.
lib1305 includes automatic run-time selection of implementations.</p>
<p>lib1305 is intended to be
called by larger multi-function libraries
(such as traditional cryptographic libraries),
including libraries in other languages via FFI.
The idea is that lib1305 takes responsibility
for the details of Poly1305 computation,
including optimization, timing-attack protection, and (planned) verification,
freeing up the calling libraries to concentrate on
application-specific needs such as protocol integration.
Applications can also call lib1305 directly.</p>
<p>Latest release: <a href="download.html">20250407</a>.</p><hr><font size=1><b>Version:</b>
This is version 2025.04.07 of the "Intro" web page.
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