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Subject [GitHub] [mina-sshd] jvz commented on pull request #132: [SSHD-506] Add support for RFC 5647
Date Wed, 03 Jun 2020 01:34:17 GMT

jvz commented on pull request #132:
URL: https://github.com/apache/mina-sshd/pull/132#issuecomment-637901360

   Found one OSS implementation of the RFC version (disabled by default) in Erlang OTP. Seems
like the ambiguity about requiring a mac with an AEAD cipher caused OpenSSH to create their
variant in the first place. Docs: https://manpages.ubuntu.com/manpages/bionic/man7/ssh.7.html
   More notes here about the official ciphers: https://www.iana.org/assignments/ssh-parameters/ssh-parameters.xhtml
   Even if we were to take the spec literally, we could create another instance of `Cipher.getInstance("AES/GCM/NoPadding")`
and then only use the methods `updateAAD()` and `doFinal()` to use it in GMAC mode. The problem
there is that the mac still wouldn't necessarily be used since it's already built in to an
AEAD operation.
   I'll note this ambiguity is avoided in the OpenSSH ChaCha protocol: https://cvsweb.openbsd.org/src/usr.bin/ssh/PROTOCOL.chacha20poly1305?annotate=HEAD

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