[#PKCS7_dataInit]
= PKCS7_dataInit
:mrdocs:

Create a BIO chain for writing content into a PKCS#7 structure (digest/encrypt filters).

== Synopsis

Declared in `<openssl/pkcs7.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BIO.adoc[BIO]*
PKCS7_dataInit(
    xref:PKCS7.adoc[PKCS7]* p7,
    xref:BIO.adoc[BIO]* bio);
----

== Return Value

BIO to which application data should be written, or NULL on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *p7*
| PKCS#7 object being signed, enveloped, digested, or encrypted.
| *bio*
| Optional BIO supplying detached content, or NULL to embed content in `p7.`
|===


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