[#SMIME_read_ASN1_ex]
= SMIME_read_ASN1_ex
:mrdocs:

Parse an S/MIME message into an ASN.1 structure described by `it.`

== Synopsis

Declared in `<openssl/asn1.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:ASN1_VALUE.adoc[ASN1_VALUE]*
SMIME_read_ASN1_ex(
    xref:BIO.adoc[BIO]* bio,
    int flags,
    xref:BIO.adoc[BIO]** bcont,
    xref:ASN1_ITEM.adoc[ASN1_ITEM] const* it,
    xref:ASN1_VALUE.adoc[ASN1_VALUE]** x,
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx,
    char const* propq);
----

== Return Value

Parsed ASN1_VALUE, or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bio*
| BIO that supplies the S/MIME input.
| *flags*
| CMS_BINARY and/or SMIME_ASCIICRLF control binary vs canonical text handling.
| *bcont*
| If non‐NULL, set to a memory BIO holding cleartext signed content, or NULL when absent.
| *it*
| Item descriptor such as ASN1_ITEM_rptr(CMS_ContentInfo) or ASN1_ITEM_rptr(PKCS7).
| *x*
| Optional existing ASN1_VALUE of type `it` to reuse, or NULL to allocate a new one.
| *libctx*
| Library context for algorithm fetches during parsing, or NULL for the default.
| *propq*
| Property query for those fetches, or NULL.
|===


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