[#CMS_signed_get_attr_by_OBJ]
= CMS_signed_get_attr_by_OBJ
:mrdocs:

Find the next signed attribute matching an OID in a CMS SignerInfo.

== Synopsis

Declared in `<openssl/cms.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CMS_signed_get_attr_by_OBJ(
    xref:CMS_SignerInfo.adoc[CMS_SignerInfo] const* si,
    xref:ASN1_OBJECT.adoc[ASN1_OBJECT] const* obj,
    int lastpos);
----

== Return Value

Index of the matching attribute, or ‐1 if none is found (or on error).

== Parameters

[cols="1,4"]
|===
| Name| Description
| *si*
| SignerInfo whose signedAttrs are searched.
| *obj*
| Attribute type OID to match.
| *lastpos*
| Index after which to continue searching (‐1 to start from the beginning).
|===


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