Re: [DNSOP] Specification of DNSKEY "Private-key-format"

Hi Viktor

On Thu, Aug 29, 2019 at 09:48:31AM -0400, Viktor Dukhovni wrote:
> On Thu, Aug 29, 2019 at 06:25:02PM +0530, Mukund Sivaraman wrote:
> > A tool such as BIND's dnssec-keygen generates the following formatted
> > private keys:
> > 
> > [muks@naina ~]$ cat Kexample.org.+008+10638.private
> > Private-key-format: v1.3
> > Algorithm: 8 (RSASHA256)
> > Modulus: [...]
> > PublicExponent: [...]
> > PrivateExponent: [...]
> > Prime1: [...]
> > Prime2: [...]
> > Exponent1: [...]
> > Exponent2: [...]
> > Coefficient: [...]
> 
> Compare the above with:
> 
>     $ openssl genrsa 512 2>/dev/null | openssl rsa -text -noout | egrep -v ':..:'
>     RSA Private-Key: (512 bit, 2 primes)
>     modulus:
>     publicExponent: 65537 (0x10001)
>     privateExponent:
>     prime1:
>     prime2:
>     exponent1:
>     exponent2:
>     coefficient:
> 
> And it becomes clear that what you're seeing is a sequence of tagged
> base64 encodings of the BIGNUM elements of the CRT form of an RSA
> private key.

I am initimately familiar with what these fields mean and the code that
generates it. The question is not about what the meaning of these fields
are.

I am asking about where this key format is specified - I want to extend
it.

> 
> > Created: [...]
> > Publish: 20190829125147
> > Activate: 20190829125147
> 
> Plus some additional metadata.
> 
> > I have looked around for a specification for this format, but I fail to
> > find one. Where is this specified? Has it ever been described in some
> > document?
> 
> This looks like an ad-hoc format, specific to dnssec-keygen and
> friends.  In particular "Publish:" and "Activate:" are not part of
> the key per-se and are rather related to the DNSSEC key lifecycle.
> 
> -- 
> 	Viktor.
> 
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> 

		Mukund

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