[#EVP_PKEY_get_attr_by_OBJ]
= EVP_PKEY_get_attr_by_OBJ
:mrdocs:

Find the next attribute on an EVP_PKEY matching object identifier `obj.`

== Synopsis

Declared in `<openssl/x509.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_get_attr_by_OBJ(
    xref:EVP_PKEY.adoc[EVP_PKEY] const* key,
    xref:ASN1_OBJECT.adoc[ASN1_OBJECT] const* obj,
    int lastpos);
----

== Return Value

* Attribute index, or ‐1 if not found.
* Attribute index, or ‐1 if not found.

== Parameters

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


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