[#DH_compute_key]
= DH_compute_key
:mrdocs:

Derive the DH shared secret from a peer public key (deprecated).

== Synopsis

Declared in `<openssl/dh.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
DH_compute_key(
    unsigned char* key,
    xref:BIGNUM.adoc[BIGNUM] const* pub_key,
    xref:DH.adoc[DH]* dh);
----

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

Number of bytes written, or ‐1 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| Output buffer of at least DH_size(`dh)` bytes.
| *pub_key*
| Peer public value.
| *dh*
| DH object holding the private key and domain parameters.
|===


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