Carl T. Miller wrote:
A couple of hours of reading man pages and Internet searches has left me clueless. Is there a way to keep sha512 as the default and to enable usage of md5 in addition to sha512?
Yes, I'm embarrassed. After asking for help, I double-checked the shadow file and discovered that the single quotes around the encrypted passwords were read into /etc/shadow. s/'//g fixed the problem.
As I suspected, md5 encrypted passwords can co-exist with sha512 passwords.
c