[#CMS_signed_get_attr_by_NID]
= CMS_signed_get_attr_by_NID
:mrdocs:

Find a signed attribute in `si` by NID, searching after `lastpos.`

== Synopsis

Declared in `<openssl/cms.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CMS_signed_get_attr_by_NID(
    xref:CMS_SignerInfo.adoc[CMS_SignerInfo] const* si,
    int nid,
    int lastpos);
----

== Return Value

Attribute index on success, or ‐1 if not found / on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *si*
| SignerInfo whose signedAttrs are searched.
| *nid*
| NID of the attribute OID to locate.
| *lastpos*
| Index to search after, or ‐1 to start from the beginning.
|===


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