typedef enum { ... } SilcSKEPKType;

    Public key and certificate types defined by the SKE protocol.

    typedef enum {
      SILC_SKE_PK_TYPE_SILC    = 1, /* Mandatory type */
      /* Optional types. These are not implemented currently */
      SILC_SKE_PK_TYPE_SSH2    = 2,
      SILC_SKE_PK_TYPE_X509V3  = 3,
      SILC_SKE_PK_TYPE_OPENPGP = 4,
      SILC_SKE_PK_TYPE_SPKI    = 5
    } SilcSKEPKType;