for (i = 0; i < len; i++)
    { 
         workingtext[i] = workingtext[i] + ikey; //add the key to the plaintext                                                                                            	
    }                                                                                           	
    return workingtext;
}

% rc4 hexkey < input > output
#define S ,t=s[i],s[i]=s[j],s[j]=t /* rc4 hexkey <file */
unsigned char k[256],s[256],i,j,t;main(c,v,e)char**v;{++v;while(++i)s[ 
i]=i;for(c=0;*(*v)++;k[c++]=e)sscanf((*v)++-1,"%2x",&e);while(j+=s[i]
+k[i%c]S,++i);for(j=0;c=~getchar();putchar(~c^s[t+=s[i]]))j+=s[++i]S;}

   workingtext[i] = 97+(workingtext[i] + ikey)%26;