[#ASN1_item_pack]
= ASN1_item_pack
:mrdocs:

Encode `obj` with `it` and store the DER result in an OCTET STRING.

== Synopsis

Declared in `<openssl/asn1.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:ASN1_STRING.adoc[ASN1_STRING]*
ASN1_item_pack(
    void* obj,
    xref:ASN1_ITEM.adoc[ASN1_ITEM] const* it,
    xref:ASN1_OCTET_STRING.adoc[ASN1_OCTET_STRING]** oct);
----

== Return Value

The OCTET STRING holding the encoded bytes, or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *obj*
| Typed ASN.1 value to encode.
| *it*
| ASN.1 item descriptor for `obj.`
| *oct*
| Optional destination OCTET STRING pointer; if NULL or *`oct` is NULL a new string is allocated.
|===


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