[PATCH] Add Ed25519 keys support

[Matt Johnston]

Thank you Vladislav, I've merged this now via github, https://secure.ucc.asn.au/hg/dropbear/rev/d32bcb5c557d

It's a nice clean and thorough implementation.

Cheers,
Matt 


> On Fri 6/3/2020, at 10:45 pm, Vladislav Grishenko <themiron.ru at gmail.com> wrote:
> 
> Hello,
>  
> Initially inspired by Péter Szabó work from 2017, but made with general approach:
>  
> ·        Curve25519/Ed25519 implementation based on TweetNaCl version 20140427, old Google's curve25519_donna dropped as unnecessary, saves a lot of size.
> ·        SHA512 reused from LibTomCrypt, no need to keep own copy
> ·        Sign/Verify require no additional memory allocation
> ·        Dropbear's API made ~similar to LibTomCrypt devel to ease possible switch, if necessary. Anyway, LibTomCrypt is based on TweetNaCl as well.
> ·        Default private key path is key/etc/dropbear/dropbear_ed25519_host_key
> ·        Implemented general import from / export to OpenSSH private keys, can be reused for other key types on necessary
> ·        Implemented *25519 fuzzers, but still need corresponding data from dropbear-fuzzcorpus 
> ·        Man, license, commens updated to fit Ed25519
>  
> So far, DROPBEAR_CURVE25519 increases dropbear binary by ~2,5Kb on X86-64 vs ~8Kb of current curve25519_donna implementation.
> DROPBEAR_ED25519 adds ~7,5Kb to dropbear and ~1kB to dropbearconvert for OpenSSH import/export.
>  
> Related PR against current sources is here https://github.com/mkj/dropbear/pull/91 <https://github.com/mkj/dropbear/pull/91>, patches are attached.
> Review and/or any suggestios will be highly appreciated.
>  
> Thank you and
> Best Regards, Vladislav Grishenko
> 
> <0001-Add-support-for-Ed25519-as-a-public-key-type.patch><0002-Add-curve25519-and-ed25519-fuzzers.patch><0003-Add-import-and-export-of-Ed25519-keys.patch>

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