typedef enum { ... } SilcSKEStatus;

    Status types returned by all SKE routines. This tell the status of
    the SKE session, and if an error occurred. 

    typedef enum {
      /* These are defined by the protocol */
      SILC_SKE_STATUS_OK                     = 0,  /* No error */
      SILC_SKE_STATUS_ERROR                  = 1,  /* Unknown error */
      SILC_SKE_STATUS_BAD_PAYLOAD            = 2,  /* Malformed payload */
      SILC_SKE_STATUS_UNKNOWN_GROUP          = 3,  /* Unsupported DH group */
      SILC_SKE_STATUS_UNKNOWN_CIPHER         = 4,  /* Unsupported cipher */
      SILC_SKE_STATUS_UNKNOWN_PKCS           = 5,  /* Unsupported PKCS algorithm */
      SILC_SKE_STATUS_UNKNOWN_HASH_FUNCTION  = 6,  /* Unsupported hash function */
      SILC_SKE_STATUS_UNKNOWN_HMAC           = 7,  /* Unsupported HMAC */
      SILC_SKE_STATUS_UNSUPPORTED_PUBLIC_KEY = 8,  /* Unsupported/not trusted PK */
      SILC_SKE_STATUS_INCORRECT_SIGNATURE    = 9,  /* Incorrect signature */
      SILC_SKE_STATUS_BAD_VERSION            = 10, /* Unsupported version */
      SILC_SKE_STATUS_INVALID_COOKIE         = 11, /* Cookie was modified */
    
      /* Implementation specific status types */
      SILC_SKE_STATUS_PENDING,                     /* SKE library is pending */
      SILC_SKE_STATUS_PUBLIC_KEY_NOT_PROVIDED,     /* Remote did not send PK */
      SILC_SKE_STATUS_KEY_EXCHANGE_NOT_ACTIVE,     /* SKE is not started */
      SILC_SKE_STATUS_BAD_RESERVED_FIELD,          /* Reserved field was not 0 */
      SILC_SKE_STATUS_BAD_PAYLOAD_LENGTH,          /* Payload includes garbage */
      SILC_SKE_STATUS_SIGNATURE_ERROR,             /* Error computing signature */
      SILC_SKE_STATUS_OUT_OF_MEMORY,               /* System out of memory */
    
      /* Other internal status types */
      SILC_SKE_STATUS_FREED,                       /* Internal library status */
    } SilcSKEStatus;