Current status of --enable-crypto

[Hal Murray]

[From gitlab]
> It uses SHA1 but not SHA0 - SHA1 is an option for packet MACs. There should
> be no problem with using the ISC version unconditionally. 

I though I saw something about getting rid of --enable-crypto

We currently require libsodium.  Do we require libssl?  If so, we can drop 
the ISC crypto code.

Does libsodium include SHA1 and friends?  Do we still need libssl?


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