expass:</b><i>string</i></dt>
<dd>

<p>Alternative to the <b>pass:</b> option where the password is specified in hexadecimal form (two hex digits per byte).</p>

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

<p>Specifies a non-secret unique cryptographic salt as an alphanumeric string (use if it contains printable characters only). The length must conform to any restrictions of the KDF algorithm. A salt parameter is required for several KDF algorithms, such as <a href="../man7/EVP_KDF-PBKD