[#PBKDF2PARAM_st-keylength]
= xref:PBKDF2PARAM_st.adoc[PBKDF2PARAM&lowbar;st]::keylength
:relfileprefix: ../
:mrdocs:

Optional derived key length in octets&semi; NULL means the cipher default&period;

== Synopsis

Declared in `&lt;openssl&sol;x509&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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xref:ASN1_INTEGER.adoc[ASN1&lowbar;INTEGER]* keylength;
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