Why are so many CRCs of XP builds FFFFFFFF

Discussion in 'Windows XP / Older OS' started by blackranger, Aug 8, 2011.

  1. blackranger

    blackranger MDL Senior Member

    Dec 28, 2009
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    How did MS do that? I had seen many builds of Windows XP w/ SP3 and they were most-likely having CRC-32 = FFFFFFFF.

    Did MS add junk data to unify the CRC values?
     
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  2. FreeStyler

    FreeStyler MDL Guru

    Jun 23, 2007
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    Explanation of the AutoCRC function can be found here
     
  3. blackranger

    blackranger MDL Senior Member

    Dec 28, 2009
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  4. NetworkPro

    NetworkPro MDL Novice

    Feb 26, 2011
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    Its still unexplained and too weird even if it's "hash collision"?
     
  5. Oz

    Oz MDL Expert

    Sep 1, 2009
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    #6 Oz, Apr 11, 2013
    Last edited by a moderator: Apr 20, 2017
    Use the Microsoft CRC.exe if you want a real crc value:

    Code:
    CRC Verification Utility, Version 3.00
    Copyright (C) Microsoft, 1992-1996
    
    AutoCRC signature for file GRTMHFPP_EN.iso is 0x1D8BBC79
    AutoCRC indicates the file GRTMHFPP_EN.iso is VALID
    
    AutoCRC signature for file GRTMHOEM_EN.iso is 0xC34593AC
    AutoCRC indicates the file GRTMHOEM_EN.iso is VALID
    
    AutoCRC signature for file GRTMPFPP_EN.iso is 0x11B88642
    AutoCRC indicates the file GRTMPFPP_EN.iso is VALID
    
    AutoCRC signature for file GRTMPOEM_EN.iso is 0x1400BEC2
    AutoCRC indicates the file GRTMPOEM_EN.iso is VALID
    
    AutoCRC signature for file GRTMPVOL_EN.iso is 0x18B45CE2
    AutoCRC indicates the file GRTMPVOL_EN.iso is VALID