t</b> <i>nm</i>:<i>v</i></dt>
<dd>

<p>Passes options to the KDF algorithm. A comprehensive list of parameters can be found in <a href="../man3/EVP_KDF.html">&quot;PARAMETERS&quot; in EVP_KDF(3)</a>. Common parameter names used by EVP_KDF_CTX_set_params() are:</p>

<dl>

<dt id="key:string"><b>key:</b><i>string</i></dt>
<dd>

<p>Specifies the secret key as an alphanumeric string (use if the key contains printable characters only). The string length must conform to any restrictions of the KDF algorithm. A ke