[#PKCS7_sign]
= PKCS7_sign
:mrdocs:

Create a PKCS#7 signed‐data structure using the default library context.

== Synopsis

Declared in `<openssl/pkcs7.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:PKCS7.adoc[PKCS7]*
PKCS7_sign(
    xref:X509.adoc[X509]* signcert,
    xref:EVP_PKEY.adoc[EVP_PKEY]* pkey,
    xref:stack_st_X509.adoc[stack_st_X509]* certs,
    xref:BIO.adoc[BIO]* data,
    int flags);
----

== Return Value

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *signcert*
| Signer certificate, or NULL when only adding certs/flags require it.
| *pkey*
| Private key corresponding to `signcert,` or NULL for deferred signing.
| *certs*
| Optional additional certificates to include, or NULL.
| *data*
| BIO supplying the content to sign when not using detached/streaming flags.
| *flags*
| PKCS7_* flags controlling detached content, streaming, and attributes.
|===


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