Allow SHA1 deprecation for rsa-sha

[Blumenthal, Uri - 0553 - MITLL]

The problem is that (AFAIK) OpenSSH doesn't work with EC tokens. 

On the other hand, I've been using RSA with SHA-2 successfully with several tokens (mostly PIV).

Regards,
Uri

Sent from my iPhone

> On Apr 5, 2017, at 19:00, Nuno Gonçalves <nunojpg at gmail.com> wrote:
> 
>> On Thu, Apr 6, 2017 at 12:29 AM, Damien Miller <djm at mindrot.org> wrote:
>> 3) Support for RSA/SHA2 signatures is still incomplete, e.g. they aren't
>>   usable with PKCS#11 tokens yet.
> 
> Could you please elaborate on what that means? I only use RSA keys
> with PKCS11 tokens (OpenSC), and it works with SHA2.
> 
>> IMO users who want a stronger signature hash algorithm should use ed25519
>> or one of the ECDSA methods for the time being. All of these use SHA2 hashes.
> 
> Exactly what I do, when I don't need to use a legacy key on a PKCS11 token...
> 
> Thanks,
> Nuno
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