From: Brian Candler <b.candler@...>
Date: 2009-10-21T16:43:46+09:00
Subject: Re: Certificate hashes using Base64, DER, ASN.1, PkiPath...

Daniel Danopia wrote:
> It seems like the hardest part is that it gives a hash.

That's the easiest part to implement, although it does hide the 
structure of what you're hashing :-)

data = "hello"
require 'digest/sha1'
puts [Digest::SHA1.digest(data)].pack("m")

> I think I'm
> going to add some debug code into the Java and print out a Base64 pre-
> hashing to see what is going on.

That's a good idea. You can then see if it's really an ASN1 Sequence of 
one or more certificates.

Full specs of ASN1 and DER/BER are in these PDFs:
http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf
http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf

HTH,

Brian.
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