RT#4302
Reviewed-by: Viktor Dukhovni <viktor@openssl.org>
This affects any signing or display option that uses a message
digest, such as the B<-fingerprint>, B<-signkey> and B<-CA> options.
Any digest supported by the OpenSSL B<dgst> command can be used.
-If not specified then SHA1 is used.
-Note that if a DSA key is used for signing, then this flag is ignored
-and SHA1 is used.
+If not specified then SHA1 is used with B<-fingerprint> or
+the default digest for the signing algorithm is used, typically SHA256.
=item B<-engine id>