[#CMS_unsigned_get0_data_by_OBJ]
= CMS_unsigned_get0_data_by_OBJ
:mrdocs:

Find an unsigned attribute by OID and return its first ASN.1 value data pointer.

== Synopsis

Declared in `<openssl/cms.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void*
CMS_unsigned_get0_data_by_OBJ(
    xref:CMS_SignerInfo.adoc[CMS_SignerInfo]* si,
    xref:ASN1_OBJECT.adoc[ASN1_OBJECT]* oid,
    int lastpos,
    int type);
----

== Return Value

Pointer to the attribute value data, or NULL on error or if not found.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *si*
| SignerInfo whose unsignedAttrs are searched.
| *oid*
| Attribute type object identifier to match.
| *lastpos*
| Search start index; use a negative value to start from the beginning (see CMS_signed_get0_data_by_OBJ).
| *type*
| Expected ASN.1 type of the attribute value (must not be V_ASN1_BOOLEAN or V_ASN1_NULL).
|===


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