Re: Weird behavior of crypt

[Corinna Vinschen <corinna-cygwin@cygwin.com>]

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On Jan 29 12:39, Marco Atzeri wrote:
> 
> 
> On 29/01/2016 12:18, Alexandre Garnier wrote:
> >Hello.
> >I'm trying to do SHA-512 password encryption, but the result is really
> >weird on Cygwin:
> >
> ># On Cygwin(either 32 or 64) 2.4.1-1, latest updates with crypt 1.1-1,
> >libcrypt0 1.1-1, libcrypt-devel 1.1-1
> >$ crypt '$6$7dl4B0fKUimdnR$' test_value
> >$6wOs/zKP2jDM
> >
> >$ python -c 'import crypt; print crypt.crypt("test_value",
> >"$6$7dl4B0fKUimdnR$")' # Python 2.7.10
> >$6wOs/zKP2jDM
> >
> >$ perl -e 'print crypt("test_value", "\$6\$7dl4B0fKUimdnR\$")."\n"' #
> >Perl v5.22.1
> >$6wOs/zKP2jDM
> >
> >Am I missing something?
> >
> >On other system, I get a more expected result:
> >
> ># On Ubuntu 15.04
> >$ mkpasswd --method=SHA-512 test_value 7dl4B0fKUimdnR
> >$6$7dl4B0fKUimdnR$f6gCu.3IfrxhsnJKFnusDH.UudC.lLOSB1G3D1bIboWxlixzBy2xO/3rCKHmzfwekCTvmQd11bPdcsJOaLkCJ.
> >

You're aware that the password field in /etc/passwd is not used, right?
Passwords are checked against the Windows user DB.  In fact, /etc/passwd
is not necessary anymore.

> Not SHA-512, see
> /usr/share/doc/crypt/crypt.README
> 
> This is the DES-crypt package Version 1.1
> 
> It provides a static library libcrypt.a as well as a shared library
> cygcrypt-0.dll together with a link lib libcrypt.dll.a, which export
> the functions
> 
>         crypt(3)
>         encrypt(3)
>         setkey(3)
> 
> The passwords created by crypt(3) are 56 bit DES encrypted and are
> 100% identical to those created by the Linux crypt().

Right.  If you need the hashes for other purposes than /etc/passwd,
you can use `openssl sha512'


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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