@c gnutls_credentials_type_t
@table @code
@item GNUTLS_@-CRD_@-CERTIFICATE
Certificate credential.
@item GNUTLS_@-CRD_@-ANON
Anonymous credential.
@item GNUTLS_@-CRD_@-SRP
SRP credential.
@item GNUTLS_@-CRD_@-PSK
PSK credential.
@item GNUTLS_@-CRD_@-IA
IA credential.
@end table