SilcBool (*encrypt)(void *, const unsigned char *, unsigned char *,
SilcUInt32, unsigned char *);
SilcBool (*decrypt)(void *, const unsigned char *, unsigned char *,
SilcBool (*encrypt)(void *, const unsigned char *, unsigned char *,
SilcUInt32, unsigned char *);
SilcBool (*decrypt)(void *, const unsigned char *, unsigned char *,