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/usr/include/diet/skalibs/rc4.h is in skalibs-dev 0.47-1.

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/* Public domain. */

#ifndef RC4_H
#define RC4_H

#define RC4_THROWAWAY 128

typedef struct RC4Schedule RC4Schedule, *RC4Schedule_ref ;

struct RC4Schedule
{
  unsigned char tab[256] ;
  unsigned char x, y ;
} ;

extern void rc4_init (RC4Schedule_ref, char const *, unsigned int) ;
extern void rc4 (RC4Schedule_ref, char const *, char *, unsigned int) ;

#endif