[#EVP_PKEY_add1_attr_by_NID]
= EVP_PKEY_add1_attr_by_NID
:mrdocs:

Append an attribute identified by NID to an EVP_PKEY's attribute set.

== Synopsis

Declared in `<openssl/x509.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_PKEY_add1_attr_by_NID(
    xref:EVP_PKEY.adoc[EVP_PKEY]* key,
    int nid,
    int type,
    unsigned char const* bytes,
    int len);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| Key whose attributes are extended.
| *nid*
| Attribute type NID.
| *type*
| ASN.1 string/type code for `bytes` (for example V_ASN1_UTF8STRING).
| *bytes*
| Attribute value bytes interpreted according to `type.`
| *len*
| Length of `bytes` in bytes.
|===


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