[#SSL_CTX_set_cert_cb]
= SSL_CTX_set_cert_cb
:mrdocs:

Install a certificate‐selection callback invoked during handshake certificate setup.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
SSL_CTX_set_cert_cb(
    xref:SSL_CTX.adoc[SSL_CTX]* c,
    int(* cb)(xref:SSL.adoc[SSL]*, void*),
    void* arg);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *c*
| SSL_CTX that owns the callback.
| *cb*
| Callback that should install certs/keys on `ssl` and return 1 on success, 0 to defer, or <0 on error.
| *arg*
| Opaque pointer passed to `cb.`
|===


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