[ech] APIs for ECH

[Stephen Farrell]

Hiya,

On 03/02/2023 22:20, Stephen Farrell wrote:
>>
>>> int SSL_ech_set1_echconfig(
>>> int SSL_ech_set1_svcb(
>>> int SSL_CTX_ech_set1_echconfig(
>> Do we need both forms, echconfig and svcb?  Maybe a utility to parse 
>> SVCB into echconfig separately? 
> 
> Fair point - one can argue these functions are doing a
> little bit too much. I'd be fine with splitting things
> as you suggest and actually now I think about it, it's
> a good suggestion - it should take any heuristic format
> guessing out of the mainstream and make for more useful
> test code, so I'll look into doing that unless someone
> thinks it's better as-is.

I took a stab at that and reckon I prefer the result, so
thanks for the suggestion!

I added an ``ossl_ech_find_echconfigs()`` that tries to
extract ECHConfig values from variously formatted strings
and simplified ``SSL_ech_set1_echconfig()``. (Still work
needed on the implementation of those - they work fine but
could be re-factored some.)

Updated API descriptions still at [1], and I'm all ears
for more comments/review!

Cheers,
S.

[1] 
https://github.com/sftcd/openssl/blob/ECH-draft-13c/doc/designs/ech-api.md
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