> If someone could forward this to DNSEXT WG, I would appreciate it.
>
> Thanks,
>
> --Dean
>
> ---------- Forwarded message ----------
> Date: Sat, 30 Aug 2008 23:14:44 -0400 (EDT)
> From: Dean Anderson <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: DNSKEY / multiprecision number format?
>
> I'm wondering how the exponent and modulus are stored in a DNSKEY record
> for RSASHA1. RFC3110 just makes some vague references to where things
> go, but does not define their precise format:
>
> exponent length 1 or 3 octets (see text)
> exponent as specified by length field
> modulus remaining space
The numbers are in network byte order.
> The format of large binary numbers is never specified in RFC3110, and no
> standard exists that I can find. I notice that BIND tools just use the
> openssl library calls bn2bin, which produces an undefined and
> non-standardized openssl format. GMP and presumably other
> multiprecision libraries have their own format. GMP's mpz_import
> function has a number of parameters for importing from different binary
> multiprecision number formats:
>
> count,
> order,
> size,
> endian,
> nails
>
> http://gmplib.org/manual/Integer-Import-and-Export.html#Integer-Import-and-Ex
> port
> "The parameters specify the format of the data. /count/ many words are
> read, each /size/ bytes. order can be 1 for most significant word
> first or -1 for least significant first. Within each word /endian/ can
> be 1 for most significant byte first, -1 for least significant first,
> or 0 for the native endianness of the host CPU. The most significant
> /nails/ bits of each word are skipped, this can be 0 to use the full
> words. "
As for any integer in network byte order, "count, 1, 1, 1, 0".
> The only one that can be inferred from an instance of an DNSKEY RR is
> count.
>
> So, can anyone say what the remaining 4 parameters should be for DNSKEY
> and other DNSSEC records?
>
> Is there an RFC that defines these parameters?
>
> Thanks,
>
> --Dean
>
>
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