[#SSL_CTX_set_tmp_dh_callback]
= SSL_CTX_set_tmp_dh_callback
:mrdocs:

Set a deprecated callback that supplies ephemeral DH parameters for server connections from a context.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
void
SSL_CTX_set_tmp_dh_callback(
    xref:SSL_CTX.adoc[SSL_CTX]* ctx,
    xref:DH.adoc[DH]*(* dh)(xref:SSL.adoc[SSL]*, int, int));
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| SSL context that invokes `dh` when temporary DH parameters are needed.
| *dh*
| Callback returning a DH object owned by the application (`is_export` / `keylength` are unused on modern OpenSSL).
|===


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