SHA2 compatibility

[Jonathan Rockway]

> This is a true statement, but not relevant to your question.  I was
> discussing DSA keys, and you're asking about RSA.  You can use any
> hash with RSA that you like.  There are no restrictions in size or
> otherwise.  The only thing you have to worry about is whether your
> recipient can handle that hash or not.

Interestingly, my OpenPGP smartcard (1024-bit RSA key) refuses to sign 
anything that's not 160 bits (i.e. SHA1 and RIPEMD-160 only).  Is there 
any reason for this, or is this a bug?

Regards,
Jonathan Rockway

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