[Bug 1299557] Re: cryptsetup luksFormat fails with -s <keysize>

[GreenReaper]

As I understand it, the key size is doubled, because XTS uses two. So
256 == AES-128 and 512 == AES-256. You probably want 256. As such, I
don't think this bug is valid because AES-64 doesn't exist.

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Title:
  cryptsetup luksFormat fails with -s <keysize>

Status in cryptsetup package in Ubuntu:
  Confirmed

Bug description:
  I installed beta2 of 14.04 yesterday.  Today, I am trying to manually
  create an encrypted partition.  If I specify a key size to cryptsetup
  with -s, cryptsetup fails as follows.

  root at slab:~# cryptsetup -y -s 128 luksFormat /dev/sda6
  WARNING!
  ========
  This will overwrite data on /dev/sda6 irrevocably.
  Are you sure? (Type uppercase yes): YES
  Enter passphrase:
  Verify passphrase:
  device-mapper: reload ioctl on  failed: Invalid argument
  Failed to open temporary keystore device.
  device-mapper: remove ioctl on temporary-cryptsetup-2231 failed: No such device or address
  device-mapper: reload ioctl on temporary-cryptsetup-2231 failed: No such device or address
  device-mapper: remove ioctl on temporary-cryptsetup-2231 failed: No such device or address
  device-mapper: remove ioctl on temporary-cryptsetup-2231 failed: No such device or address
  device-mapper: remove ioctl on temporary-cryptsetup-2231 failed: No such device or address
  device-mapper: remove ioctl on temporary-cryptsetup-2231 failed: No such device or address

  After the above, luksDump shows all 8 key slots as DISABLED.

  Without -s, cryptsetup will succeed, as follows.

  root at slab:~# cryptsetup -y luksFormat /dev/sda6
  WARNING!
  ========
  This will overwrite data on /dev/sda6 irrevocably.
  Are you sure? (Type uppercase yes): YES
  Enter passphrase:
  Verify passphrase:
  root at slab:~#

  Other info:

  root at slab:~# lsb_release -rd
  Description:    Ubuntu Trusty Tahr (development branch)
  Release:        14.04

  root at slab:~# apt-cache policy cryptsetup
  cryptsetup:
    Installed: 2:1.6.1-1ubuntu1
    Candidate: 2:1.6.1-1ubuntu1
    Version table:
   *** 2:1.6.1-1ubuntu1 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status

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