[#EVP_PKEY_get0_hmac]
= EVP_PKEY_get0_hmac
:mrdocs:

Return a pointer to the HMAC key material inside an EVP_PKEY (deprecated).

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
unsigned char const*
EVP_PKEY_get0_hmac(
    xref:EVP_PKEY.adoc[EVP_PKEY] const* pkey,
    size_t* len);
----

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

Pointer to the internal key bytes (do not free), or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *pkey*
| Key of type EVP_PKEY_HMAC.
| *len*
| Receives the key length in bytes.
|===


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