---
name: "gnutls_pkcs7_add_attr"
section: "3"
platform: "linux"
package: "gnutls"
version: "3.8.13-3"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/gnutls_pkcs7_add_attr"
---

# gnutls\_pkcs7\_add\_attr(3)

API function

## NAME

gnutls\_pkcs7\_add\_attr - API function

## SYNOPSIS

**#include \<gnutls/pkcs7.h\>**

**int gnutls\_pkcs7\_add\_attr(gnutls\_pkcs7\_attrs\_t \*** *list***, const char \*** *oid***, gnutls\_datum\_t \*** *data***, unsigned** *flags***);**

## ARGUMENTS

- gnutls\_pkcs7\_attrs\_t \* list

  A list of existing attributes or pointer to **NULL** for the first one

- const char \* oid

  the OID of the attribute to be set

- gnutls\_datum\_t \* data

  the raw (DER-encoded) data of the attribute to be set

- unsigned flags

  zero or **GNUTLS\_PKCS7\_ATTR\_ENCODE\_OCTET\_STRING**

## DESCRIPTION

This function will set a PKCS **7** attribute in the provided list. If this function fails, the previous list would be deallocated.

Note that any attributes set with this function must either be DER or BER encoded, unless a special flag is present.

## RETURNS

On success, the new list head, otherwise **NULL**.

## SINCE

3\.4.2

## REPORTING BUGS

Report bugs to \<bugs@gnutls.org\>.\
 Home page: https://www.gnutls.org

## COPYRIGHT

Copyright © 2001-2023 Free Software Foundation, Inc., and others.\
 Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.

## SEE ALSO

The full documentation for **gnutls** is maintained as a Texinfo manual. If the /usr/share/doc/gnutls/ directory does not contain the HTML form visit

- https://www.gnutls.org/manual/