[#CMS_SignerInfo_get0_signer_id]
= CMS_SignerInfo_get0_signer_id
:mrdocs:

Get the signer identifier from a CMS SignerInfo (key id, or issuer and serial).

== Synopsis

Declared in `<openssl/cms.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CMS_SignerInfo_get0_signer_id(
    xref:CMS_SignerInfo.adoc[CMS_SignerInfo]* si,
    xref:ASN1_OCTET_STRING.adoc[ASN1_OCTET_STRING]** keyid,
    xref:X509_NAME.adoc[X509_NAME]** issuer,
    xref:ASN1_INTEGER.adoc[ASN1_INTEGER]** sno);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *si*
| SignerInfo whose sid is read.
| *keyid*
| Receives the subject key identifier when that form is used, or NULL if not requested.
| *issuer*
| Receives the issuer name when issuerAndSerialNumber is used, or NULL if not requested.
| *sno*
| Receives the serial number when issuerAndSerialNumber is used, or NULL if not requested.
|===


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