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sig data (was Re: public key algorithm naming)



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At 04:10 PM 3/12/98 -0800, EKR wrote:
>P.S. As a side note, signature data probably can't just be a 
>byte string, since some signature schemes generate something
>more complicated. (I.e. DSA generates two numbers, r and s)

You're right.

The BNF reads:

<signature>:: "(" "signature" <hash> <principal> <sig-val> ")" ;

<sig-val>:: <s-part> ;

<s-part>:: <byte-string> | <s-expr> ;

but I haven't given an example of the <s-expr> for DSA sigs yet.
I need to do that.  Neither Matt nor I have DSA in our implementations
yet, so I've put off doing that definition.

 - Carl

P.S. If we end up following your suggestion, of divorcing the
hash algorithm from RSA key specifications, then that <sig-val> could
hold the hash algorithm for informational use only.  In fact,
I realize now that the BNF does not need to change in response to the
decision we make on this item and that's good, because it lets me
get back to the last piece of the draft -- that needs to be in by
5 tonight.


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