et key, salt and info:</p>

<pre><code>    openssl kdf -keylen 64 -kdfopt mac:KMAC-128 -kdfopt maclen:20 \
                -kdfopt hexkey:b74a149a161545 -kdfopt hexinfo:348a37a2 \
                -kdfopt hexsalt:3638271ccd68a2 SSKDF</code></pre>

<p>Use SSKDF with HMAC to create a hex-encoded derived key from a secret key, salt and info:</p>

<pre><code>    openssl kdf -keylen 16 -kdfopt mac:HMAC -kdfopt digest:SHA2-256 \
                -kdfopt hexkey:b74a149a -kdfopt hexinfo:348a37a2 \
                -kd