[#CMS_unsigned_add1_attr]
= CMS_unsigned_add1_attr
:mrdocs:

Append a copy of an X509_ATTRIBUTE to a CMS SignerInfo's unsigned attributes.

== Synopsis

Declared in `<openssl/cms.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CMS_unsigned_add1_attr(
    xref:CMS_SignerInfo.adoc[CMS_SignerInfo]* si,
    xref:X509_ATTRIBUTE.adoc[X509_ATTRIBUTE]* attr);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *si*
| SignerInfo whose unsignedAttrs set is extended.
| *attr*
| Attribute to copy; must not be NULL.
|===


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