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Re: Authentication with /etc/shadow

by JavaFan (Canon)
on Feb 26, 2011 at 18:44 UTC ( #890331=note: print w/replies, xml ) Need Help??


in reply to Authentication with /etc/shadow

You said, you have changed the hash. Perhaps the hash started with $1$? Because the GNU libraries have two ways of encrypting passwords: traditional DES using a 2 character seed, or an MD5 based encryption that uses a key of the form '$1$...$', where '...' is up to 8 characters.

See also your systems crypt manual page.

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Re^2: Authentication with /etc/shadow
by fluffyvoidwarrior (Monk) on Feb 26, 2011 at 19:21 UTC
    Yes, thanks.

    I chopped the first 2 chars off to use as the salt but, as you said, the hash actually started $6$ with a $ delimiter at the 8th char.

    so this must be the MD5 format

    The start of the hash is "$6$ENtbbZ8/$" so the $salt would be "ENtbbZ8/" ? ...
    and then my little code snippet might work?

    Will check out the crypt manpage Thank you.
      so this must be the MD5 format

      I believe that would be SHA512, the passwords start with $6$ -- Crypt::Password can handle it, I think.


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