avoid cyrus-sasl implementations of encryption?

Can I get cyrus-sasl to use encryption from the O.S. and not implement 
any of its own?
I am told that everything except md5 already does this if I'm using openssl.

Is there a way to get the md5 plugin to use openssl instead of its own 
encryption?

If not, how do I find out the maximum key length provided by the plugin?

I need to know what is needed to comply with any export laws wrt 
implementing encryption.

Thanks in advance for any help!