Differences in password hash calculations

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I would like to make sure I understand the /etc/shadow file, especially the salt/hash part.

Each line is in the format: 



username:passwd:last:may:must:warn:expire:disable:reserved


The passwd field is in the format : $x$salt$hash



Now, I take the hash (from the root user for example) and translate it in base64 (standard) with the command:



tr ./0-9A-Za-z A-Za-z0-9+/ hash


Why does an online hash calculator of "salt+password" give a different result?



I use a SHA-512 hash function according to the $6$ before the salt value.

I compare the two hash strings in the base64 standard encoding.

I can create the same hash string with the mkpasswd command using the salt but I can't figure out why I can't do that with an online hash calculator.



Thank you for your help.






passwd shadow base64







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    up vote
    0
    down vote

    favorite












    I would like to make sure I understand the /etc/shadow file, especially the salt/hash part.

    Each line is in the format: 



    username:passwd:last:may:must:warn:expire:disable:reserved


    The passwd field is in the format : $x$salt$hash



    Now, I take the hash (from the root user for example) and translate it in base64 (standard) with the command:



    tr ./0-9A-Za-z A-Za-z0-9+/ hash


    Why does an online hash calculator of "salt+password" give a different result?



    I use a SHA-512 hash function according to the $6$ before the salt value.

    I compare the two hash strings in the base64 standard encoding.

    I can create the same hash string with the mkpasswd command using the salt but I can't figure out why I can't do that with an online hash calculator.



    Thank you for your help.






    passwd shadow base64







    share|improve this question









    New contributor




    Maxence Faldor is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.





















      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I would like to make sure I understand the /etc/shadow file, especially the salt/hash part.

      Each line is in the format: 



      username:passwd:last:may:must:warn:expire:disable:reserved


      The passwd field is in the format : $x$salt$hash



      Now, I take the hash (from the root user for example) and translate it in base64 (standard) with the command:



      tr ./0-9A-Za-z A-Za-z0-9+/ hash


      Why does an online hash calculator of "salt+password" give a different result?



      I use a SHA-512 hash function according to the $6$ before the salt value.

      I compare the two hash strings in the base64 standard encoding.

      I can create the same hash string with the mkpasswd command using the salt but I can't figure out why I can't do that with an online hash calculator.



      Thank you for your help.






      passwd shadow base64







      share|improve this question









      New contributor




      Maxence Faldor is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      I would like to make sure I understand the /etc/shadow file, especially the salt/hash part.

      Each line is in the format: 



      username:passwd:last:may:must:warn:expire:disable:reserved


      The passwd field is in the format : $x$salt$hash



      Now, I take the hash (from the root user for example) and translate it in base64 (standard) with the command:



      tr ./0-9A-Za-z A-Za-z0-9+/ hash


      Why does an online hash calculator of "salt+password" give a different result?



      I use a SHA-512 hash function according to the $6$ before the salt value.

      I compare the two hash strings in the base64 standard encoding.

      I can create the same hash string with the mkpasswd command using the salt but I can't figure out why I can't do that with an online hash calculator.



      Thank you for your help.






      passwd shadow base64




      passwd shadow base64






      share|improve this question









      New contributor




      Maxence Faldor is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question









      New contributor




      Maxence Faldor is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question








      edited 5 mins ago









      Kusalananda

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      asked 11 mins ago









      Maxence Faldor

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      Maxence Faldor is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






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      Check out our Code of Conduct.

























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