Supplementary question:
Is the change from SHA-1 (in RFC 4193) to SHA256 (in this draft)
intentional? If so (and I presume that it is, given that SHA-1 seems to
be in disrepute), then the statements in Section 6.10.2 of the ACP document:
"The first 48 bits follow the ULA scheme, as defined in [RFC4193], to
which a type field is added:"
will have to be altered to note the change from SHA-1 to SHA256.
Bill
-------- Forwarded Message --------
Subject: [Anima] Section 6.10.2 of draft-ietf-anima-autonomic-control-plane
Date: Sat, 4 Nov 2017 13:43:54 -0400
From: William Atwood <[email protected]>
To: [email protected]
Para 2, bullet 2, says the following:
"The 40 bits ULA "global ID" (term from [RFC4193]) for ACP
addresses carried in the domain information field of domain
certificates are the first 40 bits of the SHA256 hash of the
routing subdomain from the same domain information field. In the
example of Section 6.1.1, the routing subdomain is
"area51.research.acp.example.com" and the 40 bits ULA "global ID"
a379a6f6ee."
Since I wanted to see what the SHA256 hash would be for an Autonomic
Network that I plan to create in my lab, I went looking for SHA256 hash
generators on-line.
For two different on-line generators, I get the following results:
http://www.xorbin.com/tools/sha256-hash-calculator
area51.research.acp.example.com
89b714f3db8e41558cfb49d4d763ee7cc5ae53a3ffe8a17039679d06dc9bb0e3
http://passwordsgenerator.net/sha256-hash-generator/
area51.research.acp.example.com
89B714F3DB8E41558CFB49D4D763EE7CC5AE53A3FFE8A17039679D06DC9BB0E3
These give identical results, but the first 40 bits have no (apparent)
relationship with the result cited in the ACP draft.
Does anyone have any idea which one is wrong, and why?
Bill
--
Dr. J.W. Atwood, Eng. tel: +1 (514) 848-2424 x3046
Distinguished Professor Emeritus fax: +1 (514) 848-2830
Department of Computer Science
and Software Engineering
Concordia University EV 3.185 email:[email protected]
1455 de Maisonneuve Blvd. West http://users.encs.concordia.ca/~bill
Montreal, Quebec Canada H3G 1M8
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