[#ASN1_object_size]
= ASN1_object_size
:mrdocs:

Compute the total DER size of a tagged ASN.1 value given its content length.

== Synopsis

Declared in `<openssl/asn1.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
ASN1_object_size(
    int constructed,
    int length,
    int tag);
----

== Return Value

Total number of octets for tag, length, and content, or a negative value on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *constructed*
| Non‐zero if the encoding uses a constructed form.
| *length*
| Number of content octets (or ‐1 for indefinite length).
| *tag*
| Tag number to encode (universal/application/context‐specific as used by callers).
|===


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