[B<-verify filename>]
[B<-prverify filename>]
[B<-signature filename>]
+[B<-hmac key>]
[B<file...>]
[B<md5|md4|md2|sha1|sha|mdc2|ripemd160>]
the actual signature to verify.
+=item B<-hmac key>
+
+create a hashed MAC using "key".
+
=item B<-rand file(s)>
a file or files containing random data used to seed the random number