typedef struct SilcSKRKeyStruct { ... } *SilcSKRKey;

    This context holds the public key, optional public key specific
    context and public key usage bits.  This context is returned in
    the SilcSKRFindCallback list.  Each entry in the list is SIlcSKRKey.

     */
    typedef struct SilcSKRKeyStruct {
      SilcSKRKeyUsage usage;        /* Key usage */
      SilcPublicKey key;            /* Public key */
      void *key_context;            /* Optional key specific context */
    } *SilcSKRKey;