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.






zip checksum







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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.






    zip checksum







    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.






      zip checksum







      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




      zip checksum






      share|improve this question













      share|improve this question











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      share|improve this question










      asked 2 days ago









      xenoid

      2,6701724




      2,6701724






















          1 Answer
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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.






          share|improve this answer





















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            1 Answer
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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

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                161k24358433






























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