Is there a CLI utility to compute the same CRC as used in ZIP files?











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# Create random file    
**$ dd if=/dev/urandom /of=./test.dat bs=1K count=1
# Zip it
**$ zip test.zip test.dat
# Dump contents for ZIP-computed CRC
unzip -v test.zip
Archive: test.zip
Length Method Size Cmpr Date Time CRC-32 Name
-------- ------ ------- ---- ---------- ----- -------- ----
1024 Stored 1024 0% 2018-12-09 17:42 1f197320 test.dat
-------- ------- --- -------
1024 1024 0% 1 file
# compute CRC with coreutil's cksum
**$ cksum test.dat
283837118 1024 test.dat
# convert to hex
**$ printf "%08x" 283837118
10eb02be


TL;DR: cksum doesn't use the same CRC algorithm as ZIP.










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    # Create random file    
    **$ dd if=/dev/urandom /of=./test.dat bs=1K count=1
    # Zip it
    **$ zip test.zip test.dat
    # Dump contents for ZIP-computed CRC
    unzip -v test.zip
    Archive: test.zip
    Length Method Size Cmpr Date Time CRC-32 Name
    -------- ------ ------- ---- ---------- ----- -------- ----
    1024 Stored 1024 0% 2018-12-09 17:42 1f197320 test.dat
    -------- ------- --- -------
    1024 1024 0% 1 file
    # compute CRC with coreutil's cksum
    **$ cksum test.dat
    283837118 1024 test.dat
    # convert to hex
    **$ printf "%08x" 283837118
    10eb02be


    TL;DR: cksum doesn't use the same CRC algorithm as ZIP.










    share|improve this question
























      up vote
      2
      down vote

      favorite









      up vote
      2
      down vote

      favorite











      # Create random file    
      **$ dd if=/dev/urandom /of=./test.dat bs=1K count=1
      # Zip it
      **$ zip test.zip test.dat
      # Dump contents for ZIP-computed CRC
      unzip -v test.zip
      Archive: test.zip
      Length Method Size Cmpr Date Time CRC-32 Name
      -------- ------ ------- ---- ---------- ----- -------- ----
      1024 Stored 1024 0% 2018-12-09 17:42 1f197320 test.dat
      -------- ------- --- -------
      1024 1024 0% 1 file
      # compute CRC with coreutil's cksum
      **$ cksum test.dat
      283837118 1024 test.dat
      # convert to hex
      **$ printf "%08x" 283837118
      10eb02be


      TL;DR: cksum doesn't use the same CRC algorithm as ZIP.










      share|improve this question













      # Create random file    
      **$ dd if=/dev/urandom /of=./test.dat bs=1K count=1
      # Zip it
      **$ zip test.zip test.dat
      # Dump contents for ZIP-computed CRC
      unzip -v test.zip
      Archive: test.zip
      Length Method Size Cmpr Date Time CRC-32 Name
      -------- ------ ------- ---- ---------- ----- -------- ----
      1024 Stored 1024 0% 2018-12-09 17:42 1f197320 test.dat
      -------- ------- --- -------
      1024 1024 0% 1 file
      # compute CRC with coreutil's cksum
      **$ cksum test.dat
      283837118 1024 test.dat
      # convert to hex
      **$ printf "%08x" 283837118
      10eb02be


      TL;DR: cksum doesn't use the same CRC algorithm as ZIP.







      zip checksum






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      asked 2 days ago









      xenoid

      2,6701724




      2,6701724






















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          Yes, you can use the crc32 command which is available in the Archive::Zip Perl module. On Debian and derivatives, install libarchive-zip-perl to get it.






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            1 Answer
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            up vote
            2
            down vote



            accepted










            Yes, you can use the crc32 command which is available in the Archive::Zip Perl module. On Debian and derivatives, install libarchive-zip-perl to get it.






            share|improve this answer

























              up vote
              2
              down vote



              accepted










              Yes, you can use the crc32 command which is available in the Archive::Zip Perl module. On Debian and derivatives, install libarchive-zip-perl to get it.






              share|improve this answer























                up vote
                2
                down vote



                accepted







                up vote
                2
                down vote



                accepted






                Yes, you can use the crc32 command which is available in the Archive::Zip Perl module. On Debian and derivatives, install libarchive-zip-perl to get it.






                share|improve this answer












                Yes, you can use the crc32 command which is available in the Archive::Zip Perl module. On Debian and derivatives, install libarchive-zip-perl to get it.







                share|improve this answer












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                share|improve this answer










                answered 2 days ago









                Stephen Kitt

                161k24358433




                161k24358433






























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