<div dir="ltr"><div dir="ltr">The only defined and IANA registered NSEC3 hash algorithm right now is SHA-1. See Sections 3.1.1 and 11 in RFC 5155.<div><br></div><div><a href="https://www.iana.org/assignments/dnssec-nsec3-parameters/dnssec-nsec3-parameters.xhtml#dnssec-nsec3-parameters-3">https://www.iana.org/assignments/dnssec-nsec3-parameters/dnssec-nsec3-parameters.xhtml#dnssec-nsec3-parameters-3</a><br></div><div><br></div><div>So I'm not sure what you're interpreting as using MD5. I don't use PowerDNS in any context, so can't comment on it specifically.</div><div><br></div><div>Scott</div></div></div><br><div class="gmail_quote"><div dir="ltr">On Sat, Dec 1, 2018 at 6:07 AM James Stevens <<a href="mailto:James.Stevens@jrcs.co.uk">James.Stevens@jrcs.co.uk</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">We're trying to set up a DNSSEC DNS Master that is FIPS-140 compliant. <br>
Our preference is to use NSEC3.<br>
<br>
Our main problem right now is that MD5 is universally banned under <br>
FIPS-140. The OpenSSL FIPS module simply blocks its use completely.<br>
<br>
Although the "default" hashing algorithm for NSEC3 is MD5, there is the <br>
option (in the RFC) to use others, but my feeling is that using MD5 is <br>
*so* prevalent that using a different hashing algorithm could cause <br>
validation issues on /some/ servers. I have no evidence for this - its <br>
just my gut instinct.<br>
<br>
I notice dot-GOV and dot-MIL both use MD5 and would think their signing <br>
would be FIPS-140?? But that's just a guess.<br>
<br>
We are looking at switching to NSEC, but right now, even that doesn't <br>
work for PowerDNS without MD5 support - I need to check the code to see <br>
why not.<br>
<br>
<br>
Has anybody else faced this?<br>
Any advice / comments?<br>
<br>
<br>
<br>
James<br>
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