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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