fix unit_len in auth_sha1
fix unit_len in auth_sha1

shadowsocksr-backup/shadowsocksr,loveward/yingsuo,shadowsocksR-private/shadowsocksR,loveward/yingsuo,monokoo/shadowsocks,shadowsocksr-backup/shadowsocksr,miyouzi/ch-docker-ssr,monokoo/shadowsocks,shadowsocksR-private/shadowsocksR,ZeroClover/shadowsocksr,miyouzi/ch-docker-ssr