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Re: [Curdle] ssh-ed25519 implementations

"Mark D. Baushke" <mdb@juniper.net> Thu, 11 May 2017 14:46 UTC

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To: Stefan Bühler <ietf-curdle@stbuehler.de>
CC: "curdle@ietf.org" <curdle@ietf.org>, "ietf-ssh@NetBSD.org" <ietf-ssh@NetBSD.org>
Subject: Re: [Curdle] ssh-ed25519 implementations
In-Reply-To: <76604306-d93a-5156-2350-636d3bda2323@stbuehler.de>
References: <76FD0F39-1F3D-4476-A3D8-D4C942C2EFD1@juniper.net> <76604306-d93a-5156-2350-636d3bda2323@stbuehler.de>
Comments: In-reply-to: Stefan Bühler <ietf-curdle@stbuehler.de> message dated "Thu, 11 May 2017 15:15:31 +0200."
From: "Mark D. Baushke" <mdb@juniper.net>
Date: Thu, 11 May 2017 07:39:11 -0700
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Hi Setphan,

I think I will use this text...

    To clarify a corner-case in this conversion, when X is encoded as an
    mpint K, in order to calculate the exchange hash, it may vary as
    follows:

        Trim all leading zero-bytes of X. If X is all zero-bytes,
	then the key exchange must fail.

        If the high bit of X is set, the mpint format requires
	a zero byte to be prepended.

        The length of the encoded K may not be the same as the
	original length of X due to trimming or prepending a
	zero-byte as needed for "mpint" format.

I will also add your suggested pseudo code.

	Thank you,
	-- Mark

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