arcfour_crypt
void arcfour_crypt(ARCFour_key *key, uchar_t *in, uchar_t *out, size_t len);
arcfour_crypt(keystream, input, output, inputlen);
arcfour_crypt(key, (uchar_t *)start, (uchar_t *)start,
arcfour_crypt(key, start, start, len);
arcfour_crypt(key, start, start, len);
arcfour_crypt(key, start + offset,
arcfour_crypt(key, in, start, length);
arcfour_crypt(key, in, start, len);
arcfour_crypt(key, in, start, len);
arcfour_crypt(key, start + offset,