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[Se6 <1558079@xxxxxxxxxxxxxxxxxx>]

Exact same problem here. cryptsetup with tcrypt volume stopped working
since update to 3.19.0-56. (-51was fine).

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https://bugs.launchpad.net/bugs/1558079

Title:
  cryptsetup tcryptOpen doesn't work anymore

Status in linux package in Ubuntu:
  Triaged

Bug description:
  I'm using cryptsetup to open TrueCrypt encrypted NTFS filesystems:
  cryptsetup tcryptOpen /dev/sdf2 tcrypt

  At least until linux-image-3.13.0-79-generic this work fine. 
  Booting linux-image-3.13.0-83-generic and running cryptsetup results in:

  Required kernel crypto interface not available.
  Ensure you have algif_skcipher kernel module loaded.

  The module algif_skcipher is loaded, so the tenor of the error message
  is wrong, but cryptsetup cannot open the container, so at least there
  _is_ some error. Probably it's related to some unsupported instruction
  set. With  linux-image-3.13.0-83 there are errors in dmesg which are
  not present with linux-image-3.13.0-79:

  AVX instructions are not detected

  System information:

  OS: Ubuntu 14.04.4 LTS
  CPU: Phenom II X6

  TCRYPT header information for /dev/sdf2
  Version:       	5
  Driver req.:	7
  Sector size:	512
  MK offset:	131072
  PBKDF2 hash:	ripemd160
  Cipher chain:	aes
  Cipher mode:	xts-plain64
  MK bits:       	512

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