[#EVP_PKEY_delete_attr]
= EVP_PKEY_delete_attr
:mrdocs:

Remove and return an attribute from an EVP_PKEY by index.

== Synopsis

Declared in `<openssl/x509.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:X509_ATTRIBUTE.adoc[X509_ATTRIBUTE]*
EVP_PKEY_delete_attr(
    xref:EVP_PKEY.adoc[EVP_PKEY]* key,
    int loc);
----

== Return Value

Removed X509_ATTRIBUTE (caller frees), or NULL if `loc` is invalid.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| Key whose attribute stack is modified.
| *loc*
| Zero‐based attribute index.
|===


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