sha1_hash((char *)crypt_buf, CHALLENGE_SIZE, challenge_sha1);
RC4_set_key(&ct->rc4c.send_key, RC4_KEY_LEN,
crypt_buf + CHALLENGE_SIZE);
sha1_hash((char *)crypt_buf, CHALLENGE_SIZE, challenge_sha1);
RC4_set_key(&ct->rc4c.send_key, RC4_KEY_LEN,
crypt_buf + CHALLENGE_SIZE);