[#CMS_signed_get0_data_by_OBJ]
= CMS_signed_get0_data_by_OBJ
:mrdocs:

Return the first matching signed‐attribute value of a given ASN.1 type.

== Synopsis

Declared in `<openssl/cms.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void*
CMS_signed_get0_data_by_OBJ(
    xref:CMS_SignerInfo.adoc[CMS_SignerInfo] const* si,
    xref:ASN1_OBJECT.adoc[ASN1_OBJECT] const* oid,
    int lastpos,
    int type);
----

== Return Value

Pointer to the attribute value data, or NULL if not found / type mismatch.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *si*
| SignerInfo whose signedAttrs are searched.
| *oid*
| Attribute type OID to match.
| *lastpos*
| Index after which to continue searching (‐1 to start from the beginning).
| *type*
| Expected ASN.1 type of the attribute value (for example V_ASN1_OCTET_STRING).
|===


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