[#x509_purpose_st-usr_data]
= xref:x509_purpose_st.adoc[x509_purpose_st]::usr_data
:relfileprefix: ../
:mrdocs:

Application‐specific data attached to a dynamically registered purpose.

== Synopsis

Declared in `<openssl/x509v3.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void* usr_data;
----


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