gnutls_certificate_type_list - Get a list of supported certificate
const gnutls_certificate_type_t * gnutls_certificate_type_list( void);
Get a list of certificate types. Note that to be able to use OpenPGP
certificates, you must link to libgnutls-extra and call
a zero-terminated list of gnutls_certificate_type_t integers indicating
the available certificate types.
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