How to change the default number of rounds done by SHA-2 password-hashing

Solution Verified - Updated -

Issue

  • We want to make it harder for the hashes in our /etc/shadow file to be brute-force attacked
    How can we raise the number of rounds performed by crypt()?

Environment

  • Red Hat Enterprise Linux 5.2 +
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

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