shadow/man/login.defs.d/HMAC_CRYPTO_ALGO.xml

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<varlistentry condition="no_pam">
<term><option>HMAC_CRYPTO_ALGO</option> (string)</term>
<listitem>
<para>
Used to select the HMAC cryptography algorithm that the pam_timestamp
module is going to use to calculate the keyed-hash message authentication
code.
</para>
<para>
Note: Check <refentrytitle>hmac</refentrytitle><manvolnum>3</manvolnum>
to see the possible algorithms that are available in your system.
</para>
</listitem>
</varlistentry>