System.Security.Cryptography.Pkcs.SubjectIdentifierOrKey
The SubjectIdentifierOrKey class defines the type of the identifier of a subject, such as a CmsSigner or a CmsRecipient. The subject can be identified by the certificate issuer and serial number, the hash of the subject key, or the subject key.
The Type property retrieves the type of subject identifier or key. The subject can be identified by the certificate issuer and serial number, the hash of the subject key, or the subject key.