[#PKCS7_add_signed_attribute]
= PKCS7_add_signed_attribute
:mrdocs:

Add an authenticated (signed) attribute to a PKCS#7 signer info.

== Synopsis

Declared in `<openssl/pkcs7.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
PKCS7_add_signed_attribute(
    xref:PKCS7_SIGNER_INFO.adoc[PKCS7_SIGNER_INFO]* p7si,
    int nid,
    int type,
    void* data);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *p7si*
| Signer info receiving the attribute.
| *nid*
| Attribute type NID (for example NID_pkcs9_contentType).
| *type*
| ASN.1 value type tag (V_ASN1_*) for `data.`
| *data*
| Attribute value pointer interpreted according to `type.`
|===


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