[#EVP_PKEY_asn1_set_ctrl]
= EVP_PKEY_asn1_set_ctrl
:mrdocs:

Set the control callback on an EVP_PKEY_ASN1_METHOD.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
EVP_PKEY_asn1_set_ctrl(
    xref:EVP_PKEY_ASN1_METHOD.adoc[EVP_PKEY_ASN1_METHOD]* ameth,
    int(* pkey_ctrl)(xref:EVP_PKEY.adoc[EVP_PKEY]*, int, long, void*));
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ameth*
| ASN.1 method table under construction.
| *pkey_ctrl*
| Callback for ASN.1/method control ops (for example PKCS#7/CMS), or NULL to clear.
|===


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