[#EVP_PKEY_get_attr_by_NID]
= EVP_PKEY_get_attr_by_NID
:mrdocs:

Find the next attribute on an EVP_PKEY whose type NID equals `nid.`

== Synopsis

Declared in `<openssl/x509.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_get_attr_by_NID(
    xref:EVP_PKEY.adoc[EVP_PKEY] const* key,
    int nid,
    int lastpos);
----

== Return Value

Attribute index, or ‐1 if not found.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| Key whose attribute stack is searched.
| *nid*
| Attribute type NID to match.
| *lastpos*
| Index to search after (‐1 to start from the beginning).
|===


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