[#CMS_signed_add1_attr_by_NID]
= CMS_signed_add1_attr_by_NID
:mrdocs:

Append a signed attribute identified by NID to a CMS SignerInfo.

== Synopsis

Declared in `<openssl/cms.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CMS_signed_add1_attr_by_NID(
    xref:CMS_SignerInfo.adoc[CMS_SignerInfo]* si,
    int nid,
    int type,
    void const* bytes,
    int len);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *si*
| SignerInfo whose signedAttrs set is extended.
| *nid*
| Attribute type NID (for example NID_pkcs9_signingTime).
| *type*
| ASN.1 string/type code for `bytes` (for example V_ASN1_OCTET_STRING).
| *bytes*
| Attribute value bytes interpreted according to `type.`
| *len*
| Length of `bytes` in bytes.
|===


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