Date: Jul 20, 2013 5:53 AM
Author: Bob Hanlon
Subject: Re: CRC32 Hash Missmatch


On my Mac I get the same difference as you with v7; however, both v8 and v9
give the expected identical results:

$Version


"9.0 for Mac OS X x86 (64-bit) (January 24, 2013)"


"Hello, World!" //
StringToStream //
FileHash[#, "CRC32"] & //
IntegerString[#, 16, 8] &


"ec4ac3d0"


"Hello, World!" //
Hash[#, "CRC32"] & //
IntegerString[#, 16, 8] &


"ec4ac3d0"


% == %%


True



Bob Hanlon


On Thu, Jul 18, 2013 at 2:59 AM, roby <roby.nowak@gmail.com> wrote:

> Dear Group,
>
> I am trying to calculate a CRC 32 checksum with Mathematica 7, it seems
> that:
>
> Hash[data, "CRC32"]
>
> gives different values opposed to:
>
> FileHash["datafile", "CRC32"]
>
>
>
> In[613]:=
> "Hello, World!"//
> StringToStream //
> FileHash[#, "CRC32"]& // IntegerString[#, 16, 8]&
>
> Out[613]= "ec4ac3d0"
>
>
>
> In[615]:= "Hello, World!"//
> Hash[#, "CRC32"]& // IntegerString[#, 16, 8]&
>
> Out[615]= "a776c351"
>
>
> Bug or feature or different generating polynomial ???
>
>