Optional extra to specify an X.509 certificate to install on the Intent returned by KeyChain.CreateInstallIntent. The extra value should be a PEM or ASN.1 DER encoded byte[]. An Java.Security.Cert.X509Certificate can be converted to DER encoded bytes with Java.Security.Cert.Certificate.GetEncoded.
KeyChain.ExtraName may be used to provide a default alias name for the installed certificate.