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Re: CRC32 Hash Missmatch

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131408] Re: CRC32 Hash Missmatch
  • From: "Alexey Popkov" <lehin.p at gmail.com>
  • Date: Sat, 20 Jul 2013 05:59:14 -0400 (EDT)
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  • References: <ks82q9$jnc$1@smc.vnet.net>

This bug was fixed in version 8. Here you can find a workaround for version 
7:

http://stackoverflow.com/q/1854491

HTH,
Alexey


==============================================================
"roby"  wrote:ks82q9$jnc$1 at smc.vnet.net...

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 ??? 




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