[#DH_generate_parameters]
= DH_generate_parameters
:mrdocs:

Generate Diffie‐Hellman parameters with a legacy progress callback (deprecated).

== Synopsis

Declared in `<openssl/dh.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
xref:DH.adoc[DH]*
DH_generate_parameters(
    int prime_len,
    int generator,
    void(* callback)(int, int, void*),
    void* cb_arg);
----

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

Newly allocated DH with generated parameters, or NULL on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *prime_len*
| Desired length of the prime p in bits.
| *generator*
| DH generator g (commonly 2 or 5).
| *callback*
| Optional progress callback (int, int, void *), or NULL.
| *cb_arg*
| Opaque pointer passed to `callback.`
|===


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