#include <string.h>
typedef unsigned char ch;
typedef struct {ch s[256]; ch j;} state;
void initst(state * st, ch * key){
{int j=256; while(j--) st->s[j] = j;}
 {int i, j=0, len = strlen((char*)key);
    for(i=0; i<256; ++i) 
     {j = (j + st->s[i] + key[i%len])&255;
     {ch t=st->s[i]; st->s[i]=st->s[j]; st->s[j]=t;}}}
 st->j = 0;}