tinc - Jan 2016 - Sign/verify data with ed25519 keys of a tinc 1.1 host

Hello,

Is it possible to sign/verify data with the ed25519 keys of a tinc 1.1 host?

More specifically, is it possible to sign a file with these keys using openssl?
If so, how? If not, what program could be used, and how?

Thanks and cheers, @

On Tue, Jan 26, 2016 at 07:35:10PM +0100, Anton Voyl wrote:
> Is it possible to sign/verify data with the ed25519 keys of a tinc 1.1
host?
In principle yes, but tinc does not offer a way to do that. Also,
reusing a key for another purpose is not recommended. What do you want
to do exactly?
> More specifically, is it possible to sign a file with these keys using
openssl? If so, how? If not, what program could be used, and how?
No, because OpenSSL does not support Ed25519 keys. I don't know which
tool can.

Also, even though it looks like PEM encoding, the ed25519.priv file
is actually just a base64 encoded dump of the raw key, there's no ASN.1
involved.  I don't know if there is a standard for Ed25519 key formats.
Even OpenSSH's id_ed25519 files don't contain valid ASN.1.

-- 
Met vriendelijke groet / with kind regards,
     Guus Sliepen <guus at tinc-vpn.org>
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My intention was to sign the content of export-all with the nodes' public
key, which would require the corresponding private key to verify.

Does this make sense ?

@
> Le 26 janv. 2016 ? 20:19, Guus Sliepen <guus at tinc-vpn.org> a ?crit
:
> 
>> On Tue, Jan 26, 2016 at 07:35:10PM +0100, Anton Voyl wrote:
>> 
>> Is it possible to sign/verify data with the ed25519 keys of a tinc 1.1
host?
> 
> In principle yes, but tinc does not offer a way to do that. Also,
> reusing a key for another purpose is not recommended. What do you want
> to do exactly?
> 
>> More specifically, is it possible to sign a file with these keys using
openssl? If so, how? If not, what program could be used, and how?
> 
> No, because OpenSSL does not support Ed25519 keys. I don't know which
> tool can.
> 
> Also, even though it looks like PEM encoding, the ed25519.priv file
> is actually just a base64 encoded dump of the raw key, there's no ASN.1
> involved.  I don't know if there is a standard for Ed25519 key formats.
> Even OpenSSH's id_ed25519 files don't contain valid ASN.1.
> 
> -- 
> Met vriendelijke groet / with kind regards,
>     Guus Sliepen <guus at tinc-vpn.org>
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