Hi Felix, Maybe we should keep sha512 and switch to it? md5 is not best security practice these days. I've checked, ubuntu 14.04 and fedora 22 both use sha512 in /etc/shadow
I wonder if AF_ALG can be of any interest here (integrate needed algo by default into the kernel, then patch core software to use kernel implementation) To conclude maybe you should emit a clear error when we try a now unsupported hash, because crypt can be used by other app, so maybe you just broke another app and someone will waste a good amount of time debugging it Regards Etienne
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