[#PKCS7_sign_add_signer]
= PKCS7_sign_add_signer
:mrdocs:

Add a signer to an existing SignedData PKCS#7 created for incremental signing.

== Synopsis

Declared in `<openssl/pkcs7.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:PKCS7_SIGNER_INFO.adoc[PKCS7_SIGNER_INFO]*
PKCS7_sign_add_signer(
    xref:PKCS7.adoc[PKCS7]* p7,
    xref:X509.adoc[X509]* signcert,
    xref:EVP_PKEY.adoc[EVP_PKEY]* pkey,
    xref:EVP_MD.adoc[EVP_MD] const* md,
    int flags);
----

== Return Value

New signer info on success, or NULL on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *p7*
| PKCS#7 SignedData object previously prepared for signing.
| *signcert*
| Certificate corresponding to `pkey.`
| *pkey*
| Private key used to sign.
| *md*
| Message digest algorithm, or NULL to use the key's default.
| *flags*
| PKCS7_* signing flags (for example PKCS7_REUSE_DIGEST or PKCS7_PARTIAL).
|===


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