[#SSL_CTX_set_cert_verify_callback]
= SSL_CTX_set_cert_verify_callback
:mrdocs:

Replace the built‐in peer certificate verification procedure with an application callback.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
SSL_CTX_set_cert_verify_callback(
    xref:SSL_CTX.adoc[SSL_CTX]* ctx,
    int(* cb)(xref:X509_STORE_CTX.adoc[X509_STORE_CTX]*, void*),
    void* arg);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| SSL context; SSL objects created from it inherit `cb` and `arg` at SSL_new time.
| *cb*
| Verification callback receiving the X509_STORE_CTX and `arg;` return 1 to accept, 0 to fail; NULL restores the default.
| *arg*
| Application pointer passed to `cb` on each invocation.
|===


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