[#PKCS7_add_signature]
= PKCS7_add_signature
:mrdocs:

Create a signer info from `x509` / `pkey` / `dgst` and add it to signed PKCS#7 `p7.`

== Synopsis

Declared in `<openssl/pkcs7.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:PKCS7_SIGNER_INFO.adoc[PKCS7_SIGNER_INFO]*
PKCS7_add_signature(
    xref:PKCS7.adoc[PKCS7]* p7,
    xref:X509.adoc[X509]* x509,
    xref:EVP_PKEY.adoc[EVP_PKEY]* pkey,
    xref:EVP_MD.adoc[EVP_MD] const* dgst);
----

== Return Value

The new PKCS7_SIGNER_INFO on success, or NULL on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *p7*
| PKCS#7 SignedData (or signed‐and‐enveloped) object to update.
| *x509*
| Signer certificate identifying the signing key.
| *pkey*
| Private key corresponding to `x509.`
| *dgst*
| Message digest algorithm used for signing.
|===


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