 a hex-encoded derived key from a secret key and seed:</p>

<pre><code>    openssl kdf -keylen 16 -kdfopt digest:SHA2-256 -kdfopt key:secret \
                -kdfopt seed:seed TLS1-PRF</code></pre>

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

<pre><code>    openssl kdf -keylen 10 -kdfopt digest:SHA2-256 -kdfopt key:secret \
                -kdfopt salt:salt -kdfopt info:label HKDF</code></pre>

<p>Use SSKDF with KMAC to create a hex-encoded derived key from a secr