above review was abandoned. new review(s) at

remote:   https://reviews.mahara.org/854
remote:   https://reviews.mahara.org/855

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https://bugs.launchpad.net/bugs/843568

Title:
  Stored passwords with a stronger hash algorithm

Status in Mahara ePortfolio:
  In Progress

Bug description:
  MD5 is broken, we should switch to something better.

  Ideally, we should use PHP 5.3.2's crypt() function
  (http://nz.php.net/manual/en/function.crypt.php) with the
  CRYPT_BLOWFISH algorithm. Not sure what cost parameter we should use,
  but ideally a large number (we should do tests here).

  Note that bulk creation of users will be slowed down by using a slow
  hash. So perhaps in that case, we should use SHA256. Which means that
  Mahara needs to recognize 3 hash formats at least:

  - the existing MD5-hashed passwords
  - the new Blowfish ones
  - the new SHA256 ones

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