[#ASN1_item_d2i]
= ASN1_item_d2i
:mrdocs:

Decode a DER‐encoded ASN.1 value using an item descriptor (default library context).

== Synopsis

Declared in `<openssl/asn1.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:ASN1_VALUE.adoc[ASN1_VALUE]*
ASN1_item_d2i(
    xref:ASN1_VALUE.adoc[ASN1_VALUE]** val,
    unsigned char const** in,
    long len,
    xref:ASN1_ITEM.adoc[ASN1_ITEM] const* it);
----

== Description

Equivalent to ASN1_item_d2i_ex() with a NULL library context and property query.

== Return Value

Decoded ASN1_VALUE, or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *val*
| Optional destination pointer updated to the result, or NULL.
| *in*
| Address of a pointer to the DER input; advanced past the decoded value.
| *len*
| Number of bytes available at *`in.`
| *it*
| ASN.1 item descriptor for the type to decode.
|===


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