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This was triggered by https://issues.redhat.com/browse/CERTPX-10505
The default password encryption algorithm now is yescrypt, this change was not intentional and should be changed back to sha512
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yescrypt is not actually supported on 8.7 nor on rhel9 and it produces error message in journal "pam_unix(passwd:chauthtok): unrecognized option [yescrypt]". It does not affect the customers or the security in any way as new password is created with sha512 in my tests, it just produces the log message.
However, since yescrypt is not supported in pam_unix/shadow-utils in rhel8 nor in rhel9 we should revert the patch and make it "sha512" again in z-stream.
```
Thanks
Jianwei