[#SMIME_read_PKCS7_ex]
= SMIME_read_PKCS7_ex
:mrdocs:

Parse an S/MIME message into a PKCS#7 structure, optionally reusing `p7.`

== Synopsis

Declared in `<openssl/pkcs7.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:PKCS7.adoc[PKCS7]*
SMIME_read_PKCS7_ex(
    xref:BIO.adoc[BIO]* bio,
    xref:BIO.adoc[BIO]** bcont,
    xref:PKCS7.adoc[PKCS7]** p7);
----

== Return Value

Parsed PKCS7, or NULL on error; free with PKCS7_free.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *bio*
| BIO supplying the S/MIME message.
| *bcont*
| Optional destination for a memory BIO holding cleartext signed content, or NULL.
| *p7*
| Optional pre‐allocated PKCS7 from PKCS7_new_ex(), or NULL to allocate a new one.
|===


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