curve25519 and encryption capabilities

[Kristian Fiskerstrand]

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On 09/19/2014 10:34 PM, Daniel Kahn Gillmor wrote:
> Hi Werner--
> 

..

>> 
>> ECDH (encryption) is 18 ECDSA (signing) should be 19
> 
> Ah, right.  signing-capable keys are indeed ID 19.
> 
>> The keys are technically exchangeable.
> 
> That's a little weird.  it seems in some sense like we're heading
> back to ID 2 and 3 (RSA encrypt-only and RSA sign-only), which i
> thought the community had moved away from in favor of generic ID 1
> (RSA).  but in practice, since we want to discourage reuse of keys
> in different

Although the keys are technically exchangable, they have different
fields when parsing c.f. rfc6637 (see the kdf parts for ecdh), so
separate algo-id makes it cleaner to parse it.

- -- 
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Kristian Fiskerstrand
Blog: http://blog.sumptuouscapital.com
Twitter: @krifisk
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