Any alternative to rsautl for signing ("signaturing") ?

[Jerry Krinock]

In the man page for rsautl, OpenSSL 0.9.7l in Mac OS X, I read this  
"Note" at the bottom:

"rsautl because it uses the RSA algorithm directly can only be used to  
sign or verify small pieces of data."

That seems to imply that there is a better alternative to rsautl for  
signing.  What is it?  I'd like to have a look at it.

Thanks,

Jerry Krinock
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