[#ENGINE_PKEY_ASN1_METHS_PTR]
= ENGINE_PKEY_ASN1_METHS_PTR
:mrdocs:

ENGINE ASN.1 method handler: list supported NIDs or return an EVP_PKEY_ASN1_METHOD.

== Synopsis

Declared in `<openssl/engine.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef int(* ENGINE_PKEY_ASN1_METHS_PTR)(xref:ENGINE.adoc[ENGINE]*, xref:EVP_PKEY_ASN1_METHOD.adoc[EVP_PKEY_ASN1_METHOD]**, int const**, int);
----

== Description

Same calling convention as ENGINE_DIGESTS_PTR / ENGINE_CIPHERS_PTR: fetch by NID when the method out‐parameter is non‐NULL, otherwise enumerate NIDs.


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