[#ASN1_item_d2i_bio_ex]
= ASN1_item_d2i_bio_ex
:mrdocs:

Decode an ASN.1 value described by `it` from a BIO, with library context.

== Synopsis

Declared in `<openssl/asn1.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void*
ASN1_item_d2i_bio_ex(
    xref:ASN1_ITEM.adoc[ASN1_ITEM] const* it,
    xref:BIO.adoc[BIO]* in,
    void* pval,
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx,
    char const* propq);
----

== Return Value

Decoded object pointer, or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *it*
| ASN.1 item describing the type to decode.
| *in*
| BIO positioned at DER input.
| *pval*
| Optional existing object to reuse, or NULL to allocate.
| *libctx*
| Library context for algorithm fetches during decode, or NULL for the default.
| *propq*
| Property query for algorithm fetches, or NULL.
|===


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