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Support aes-hctr2 mode.

Milan Broz requested to merge hctr2-fix into main

The HCTR2 encryption was added to Linux kernel for fscrypt, but as it is length-preserving mode (with sector tweak) it can be easily used for disk encryption too.

As it need larger IV of size 32 bytes, we need to add exception for aes-hctr2[-plain64] to be accepted in cryptsetup commands.

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