[#SSL_CTX_set_ct_validation_callback]
= SSL_CTX_set_ct_validation_callback
:mrdocs:

Register a Certificate Transparency validation callback for an SSL context.

== Synopsis

Declared in `<openssl/ssl.h>`

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

== Return Value

1 on success, or 0 on failure (e.g. conflicting SCT custom extension).

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| SSL context whose connections inherit `callback.`
| *callback*
| SCT policy callback, or NULL to disable CT validation.
| *arg*
| Opaque userdata passed to `callback` on each invocation.
|===


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