SHA 512, /etc/shadow decrypt

$6$

NOTES         top

Glibc notes

       The glibc2 version of this function supports additional encryption
       algorithms.

       If salt is a character string starting with the characters "$id$"
       followed by a string terminated by "$":

              $id$salt$encrypted

       then instead of using the DES machine, id identifies the encryption
       method used and this then determines how the rest of the password
       string is interpreted.  The following values of id are supported:

              ID  | Method
              ---------------------------------------------------------
              1   | MD5
              2a  | Blowfish (not in mainline glibc; added in some
                  | Linux distributions)
              5   | SHA-256 (since glibc 2.7)
              6   | SHA-512 (since glibc 2.7)

       So $5$salt$encrypted is an SHA-256 encoded password and
       $6$salt$encrypted is an SHA-512 encoded one.

       "salt" stands for the up to 16 characters following "$id$" in the
       salt.  The encrypted part of the password string is the actual
       computed password.  The size of this string is fixed:

       MD5     | 22 characters
       SHA-256 | 43 characters
       SHA-512 | 86 characters

       The characters in "salt" and "encrypted" are drawn from the set
       [a-zA-Z0-9./].  In the MD5 and SHA implementations the entire key is
       significant (instead of only the first 8 bytes in DES).