[Twisted-Python] hmac-sha2-512 - Corrupted MAC on input with OpenSSH

hi: | | I write a SSH server with Twisted(15.5.0) Conch. But it don't support hmac-sha2-512 MAC algorithms | . However I see this problem has been fixed in https://twistedmatrix.com/trac/ticket/8108 . I asked the question in http://stackoverflow.com/questions/41254398/twisted-hmac-sha2-512-corrupted-... . Best regards, ---jianchen