[Canberra-pm] crypt behaviour

[Adam Clarke]

From crypt(3) manpage on an old (Etch) Debian box ...

GNU EXTENSION
       The glibc2 version of this function has the following  additional  fea‐
       tures.   If  salt is a character string starting with the three charac‐
       ters "$1$" followed by at most eight characters, and optionally  termi‐
       nated  by  "$",  then instead of using the DES machine, the glibc crypt
       function uses an MD5-based algorithm,  and  outputs  up  to  34  bytes,
       namely  "$1$<string>$", where "<string>" stands for the up to 8 charac‐
       ters following "$1$" in the salt, followed by 22 bytes chosen from  the
       set [a–zA–Z0–9./].  The entire key is significant here (instead of only
       the first 8 bytes).

On 06/06/2012, at 1:09 PM, Alex Satrapa wrote:

> According to http://www.perlmonks.com/?node_id=62392 there is a means to get crypt to use MD5 by providing an 8-byte salt preceded by $1$.
> 
> This doesn't work on Mac OS X or, as indicated on that page, under Active Perl for Windows.
> 
> Does anyone know where this MD5 magic behavior of crypt is documented?
> 
> Alex Satrapa | web.mac.com/alexsatrapa | Ph: 0407 705 332
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