Hi Steve.
Richard DeVenezia's web page is an excellent resource too, and it has an example of the call module (Darryl's suggestion) that might be a fairly close template to what you want: it calls the win MD5 dll from sas. see
http://www.devenezia.com/downloads/sas/sascbtbl/
Let us know if this apporach helps you.
Use a PIPE.
data _null_;
infile 'openssl ...' pipe ;
input ;
call symputx('myvar',_infile_);
run;
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