test:
1. create a truecrypt volume using multiple algorithms,i went with AES-twofist-serpent
2. open the volume using cryptsetup with "cryptsetup tcryptOpen ttt ttt"
3. ls -l /dev/mapper/ will give:
crw------- 1 root root 10, 236 Feb 17 22:37 /dev/mapper/control
lrwxrwxrwx 1 root root 7 Feb 17 23:45 /dev/mapper/ttt -> ../dm-2
lrwxrwxrwx 1 root root 7 Feb 17 23:45 /dev/mapper/ttt_1 -> ../dm-1
lrwxrwxrwx 1 root root 7 Feb 17 23:45 /dev/mapper/ttt_2 -> ../dm-0
It looks like 3 mapper will be created,each per algorithm.
closing the mapper with " cryptsetup tcryptClose ttt" will remove all three mappers expected.
closing the mapper through the library "crypt_deactivate( NULL,"ttt" )" will not remove all 3,just the "ttt" one.With the library call, all 3 seem to require to be removed individually.
Is this behavior of the library expected?
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