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<title>FIDO_CRED_VERIFY(3)</title>
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<table class="head">
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<td class="head-ltitle">FIDO_CRED_VERIFY(3)</td>
<td class="head-vol">FreeBSD Library Functions Manual</td>
<td class="head-rtitle">FIDO_CRED_VERIFY(3)</td>
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<div class="manual-text">
<section class="Sh">
<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
<code class="Nm">fido_cred_verify</code>,
<code class="Nm">fido_cred_verify_self</code> —
<div class="Nd">verify the attestation signature of a FIDO2 credential</div>
</section>
<section class="Sh">
<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
<code class="In">#include <<a class="In">fido.h</a>></code>
<p class="Pp"><var class="Ft">int</var>
<br/>
<code class="Fn">fido_cred_verify</code>(<var class="Fa" style="white-space: nowrap;">const
fido_cred_t *cred</var>);</p>
<p class="Pp"><var class="Ft">int</var>
<br/>
<code class="Fn">fido_cred_verify_self</code>(<var class="Fa" style="white-space: nowrap;">const
fido_cred_t *cred</var>);</p>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
The <code class="Fn">fido_cred_verify</code>() and
<code class="Fn">fido_cred_verify_self</code>() functions verify whether the
attestation signature contained in <var class="Fa">cred</var> matches the
attributes of the credential. Before using
<code class="Fn">fido_cred_verify</code>() or
<code class="Fn">fido_cred_verify_self</code>() in a sensitive context, the
reader is strongly encouraged to make herself familiar with the FIDO2
credential attestation process as defined in the Web Authentication (webauthn)
standard.
<p class="Pp">The <code class="Fn">fido_cred_verify</code>() function verifies
whether the client data hash, relying party ID, credential ID, type,
protection policy, minimum PIN length, and resident/discoverable key and
user verification attributes of <var class="Fa">cred</var> have been
attested by the holder of the private counterpart of the public key
contained in the credential's x509 certificate.</p>
<p class="Pp">Please note that the x509 certificate itself is not verified.</p>
<p class="Pp">The attestation statement formats supported by
<code class="Fn">fido_cred_verify</code>() are <i class="Em">packed</i>,
<i class="Em">fido-u2f</i>, and <i class="Em">tpm</i>. The attestation type
implemented by <code class="Fn">fido_cred_verify</code>() is
<i class="Em">Basic Attestation</i>.</p>
<p class="Pp">The <code class="Fn">fido_cred_verify_self</code>() function
verifies whether the client data hash, relying party ID, credential ID,
type, protection policy, minimum PIN length, and resident/discoverable key
and user verification attributes of <var class="Fa">cred</var> have been
attested by the holder of the credential's private key.</p>
<p class="Pp">The attestation statement formats supported by
<code class="Fn">fido_cred_verify_self</code>() are <i class="Em">packed</i>
and <i class="Em">fido-u2f</i>. The attestation type implemented by
<code class="Fn">fido_cred_verify_self</code>() is <i class="Em">Self
Attestation</i>.</p>
<p class="Pp">Other attestation formats and types are not supported.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="RETURN_VALUES"><a class="permalink" href="#RETURN_VALUES">RETURN
VALUES</a></h1>
The error codes returned by <code class="Fn">fido_cred_verify</code>() and
<code class="Fn">fido_cred_verify_self</code>() are defined in
<code class="In"><<a class="In">fido/err.h</a>></code>. If
<var class="Fa">cred</var> passes verification, then
<code class="Dv">FIDO_OK</code> is returned.
</section>
<section class="Sh">
<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
ALSO</a></h1>
<a class="Xr" href="fido_cred_new.html">fido_cred_new(3)</a>,
<a class="Xr" href="fido_cred_set_authdata.html">fido_cred_set_authdata(3)</a>
</section>
</div>
<table class="foot">
<tr>
<td class="foot-date">May 23, 2018</td>
<td class="foot-os">Yubico AB</td>
</tr>
</table>
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