[#CMS_SignerInfo_cert_cmp]
= CMS_SignerInfo_cert_cmp
:mrdocs:

Compare a certificate against the signer identifier of a CMS SignerInfo.

== Synopsis

Declared in `<openssl/cms.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CMS_SignerInfo_cert_cmp(
    xref:CMS_SignerInfo.adoc[CMS_SignerInfo]* si,
    xref:X509.adoc[X509]* cert);
----

== Return Value

0 if `cert` matches the signer id, or non‐zero otherwise.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *si*
| SignerInfo whose sid is compared.
| *cert*
| Candidate signer certificate.
|===


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