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Re: hashed unix/shadow SHA512 passwords

by hobbs (Monk)
on Jul 21, 2009 at 23:23 UTC ( #782119=note: print w/replies, xml ) Need Help??


in reply to hashed unix/shadow SHA512 passwords

Unless you have a pressing need (like ability to run the script on a different system with a different crypt()) then don't try to do this. Instead just write something like my $shadow = crypt($root_pass, '$6$' . $salt); and you're good to go! The way that crypt() is designed it's equally good for generating or checking a hash.

Oh, but to answer the question you actually asked, the reason is that the "SHA-512" crypt() algorithm isn't SHA-512, it's a key-derivation function using SHA-512. Likewise the "MD5" crypt algorithm isn't MD5, etc. The actual algorithm is specified here as far as I can tell, but you shouldn't worry about implementing it. Let crypt() do that for you.

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Re^2: hashed unix/shadow SHA512 passwords
by greenmoss (Novice) on Apr 16, 2010 at 20:47 UTC
    Thanks; I can only vaguely remember why I needed this, but I'm sure I will stumble across this again, and will try your solution.

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