[#DH_generate_parameters_ex]
= DH_generate_parameters_ex
:mrdocs:

Generate Diffie‐Hellman domain parameters into `dh` (deprecated).

== Synopsis

Declared in `<openssl/dh.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
DH_generate_parameters_ex(
    xref:DH.adoc[DH]* dh,
    int prime_len,
    int generator,
    xref:BN_GENCB.adoc[BN_GENCB]* cb);
----

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

Prefer EVP_PKEY_paramgen for new code.

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *dh*
| Destination DH object that receives p and g.
| *prime_len*
| Desired bit length of the prime modulus p.
| *generator*
| Generator g (commonly 2 or 5).
| *cb*
| Optional BN_GENCB progress callback, or NULL.
|===


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