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Re: [Dcrup] draft-ietf-dcrup-dkim-crypto-00

Jim Fenton <fenton@bluepopcorn.net> Fri, 19 May 2017 19:09 UTC

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To: "Salz, Rich" <rsalz@akamai.com>, "dcrup@ietf.org" <dcrup@ietf.org>
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From: Jim Fenton <fenton@bluepopcorn.net>
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Date: Fri, 19 May 2017 12:08:56 -0700
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Subject: Re: [Dcrup] draft-ietf-dcrup-dkim-crypto-00
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On 5/19/17 12:00 PM, Salz, Rich wrote:
>> The fingerprint is created as follows: create the binary
>> representation of the RSA exponent (e) and modulus (n) and
> What is the binary representation?  Is it the DER or the native BIGNUM format?

I can't remember; this was back in 2005 and Mike Thomas did the
implementation.

Regardless, I wouldn't do the same thing today. Use SHA256 instead of
SHA1, and I'm not sure the truncation is a good idea.

-Jim

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