[#SSL_CTX_set_tlsext_ticket_key_evp_cb]
= SSL_CTX_set_tlsext_ticket_key_evp_cb
:mrdocs:

Set the TLS session‐ticket key callback using EVP cipher and MAC contexts.

== Synopsis

Declared in `<openssl/tls1.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
SSL_CTX_set_tlsext_ticket_key_evp_cb(
    xref:SSL_CTX.adoc[SSL_CTX]* ctx,
    int(* fp)(xref:SSL.adoc[SSL]*, unsigned char*, unsigned char*, xref:EVP_CIPHER_CTX.adoc[EVP_CIPHER_CTX]*, xref:EVP_MAC_CTX.adoc[EVP_MAC_CTX]*, int));
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| SSL context whose ticket encryption keys are managed by `fp.`
| *fp*
| Callback invoked to initialize encrypt/decrypt/HMAC state for ticket processing, or NULL to clear.
|===


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