ssh-ed25519 implementations

"Mark D. Baushke" <mdb@juniper.net> Thu, 11 May 2017 01:47 UTC

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To: <ietf-ssh@NetBSD.org>
From: "Mark D. Baushke" <mdb@juniper.net>
Subject: ssh-ed25519 implementations
Date: Wed, 10 May 2017 18:39:19 -0700
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[Second attempt. my first attempt got bounced by fraud detection checks
for some unknown reason. -- mdb]

Hi,

Eric Rescorla <ekr@rtfm.com> has brought to my attention that in
https://tools.ietf.org/html/draft-ietf-curdle-ssh-curves-04 it is
currently specifying the SSH encoding of secrets on the wire using the
mpint process as described in section 5 of [RFC4251] while RFC 7748
describes using a little-endian format:

  GF(2^448 - 2^224 - 1) and are encoded as an array of bytes, u,
  in little-endian order such that u[0] + 256*u[1] + 256^2*u[2] + ... +

This seems to be what is being implemeneted for
curve25519-sha256@libssh.org, so I should make
an explicit note of this in the draft.

However, I am unaware of any curve448-sha512 implementations at
present and would like consensus that it should also follow the mpint
method rather than the RFC 7748 method.

Please reply to curdle@ietf.org with your opinions.

        Thank you,
        -- Mark