[#ASN1_item_i2d]
= ASN1_item_i2d
:mrdocs:

Encode an ASN.1 value described by `it` to DER.

== Synopsis

Declared in `<openssl/asn1.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
ASN1_item_i2d(
    xref:ASN1_VALUE.adoc[ASN1_VALUE] const* val,
    unsigned char** out,
    xref:ASN1_ITEM.adoc[ASN1_ITEM] const* it);
----

== Return Value

Number of bytes encoded, or a negative value on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *val*
| Value to encode (typed according to `it).`
| *out*
| Destination pointer updated like a standard i2d encoder, or NULL to measure length.
| *it*
| ASN.1 item descriptor for the type of `val.`
|===


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