Re: Generating session keys in RPG using HASH values

Why do the hashing?  

How about 12i number jjjhhmmssxxx
      jjj = julian day
      hhmmss = time
      xxx = adjusted milliseconds

I is guaranteed unique for a year, a duplicate is a virtual
impossibility, and you don't have to screw around with figuring out
API's etc.

Take care.

>>> mskvarenina@usa.net 01/16/03 11:02AM >>>
Tom, that was my first idea.  I cooked up an algorithm that took the
timestamp, including the milliseconds and performed a bunch of
mathematics
to it but as you can see below, patterns became obvious.  The columns
were
as follows:  Milliseconds (note we don't get the full 6 digits in
RPG),
adjusted milliseconds, second, minute, hour, minute, calculated
number,
substring of calculated number.

 692000   692   04   17   10   16   000172757734260   757734
 693000   693   04   17   10   16   000173007384165   007384
 694000   694   04   17   10   16   000173257034070   257034
 695000   695   04   17   10   16   000173506683975   506683
 696000   696   04   17   10   16   000173756333880   756333
 697000   697   04   17   10   16   000174005983785   005983
 698000   698   04   17   10   16   000174255633690   255633
 699000   699   04   17   10   16   000174505283595   505283
 700000   700   04   17   10   16   000174754933500   754933
 701000   701   04   17   10   16   000175004583405   004583
 702000   702   04   17   10   16   000175254233310   254233
 703000   703   04   17   10   16   000175503883215   503883
 704000   704   04   17   10   16   000175753533120   753533
 705000   705   04   17   10   16   000176003183025   003183
 706000   706   04   17   10   16   000176252832930   252832



----- Original Message -----
From: "Tom Jedrzejewicz @ San Pedro" <TJedrzejewicz@contessa.com>
To: <web400@midrange.com>
Sent: Thursday, January 16, 2003 1:23 PM
Subject: Re: [WEB400] Generating session keys in RPG using HASH values


> How about getting the current system time out to the millisecond?
> It isn't random, but it will be unique.
>
> >>> mskvarenina@usa.net 01/16/03 08:59AM >>>
> I need to generate a pseudo-random character string to be used as a
> session key in my browser applications.  Has anyone used a hashing
> method in RPG to generate a pseudo-random number and if so, could
you
> please post it.
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