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Date: Fri, 29 Jan 2016 13:09:19 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Weird behavior of crypt
Message-ID: <20160129120919.GB14874@calimero.vinschen.de>
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References: <CAFFOgCUoiL06QNFvXOJ-E46FOmpG4S_K4O52k+rt_Ysxpw2aag AT mail DOT gmail DOT com> <56AB4F64 DOT 3070807 AT gmail DOT com>
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On Jan 29 12:39, Marco Atzeri wrote:
>=20
>=20
> 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=3DSHA-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
>=20
> This is the DES-crypt package Version 1.1
>=20
> 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
>=20
>         crypt(3)
>         encrypt(3)
>         setkey(3)
>=20
> 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

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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