Milan Broz authored Jan 06, 2019 and Ondrej Kozina committed Jan 07, 2019

This patch makes available LUKS2 per-keyslot encryption settings to user.

In LUKS2, keyslot can use different encryption that data.

We can use new crypt_keyslot_get_encryption and crypt_keyslot_set_encryption
API calls to set/get this encryption.

For cryptsetup new --keyslot-cipher and --keyslot-key-size options are added.

The default keyslot encryption algorithm (if cannot be derived from data encryption)
is now available as configure options (default is aes-xts-plain64 with 512-bits key).
NOTE: default was increased from 256-bits.