Corrected dmsetup argument in README.md.

[fadedbee]

When I attempted to use the dmsetup command, I received an error:

root@smarcimx8mq4g:/data/caam# dmsetup -v create encrypted --table "0 $(blockdev --getsz /dev/mmcblk1p3) crypt capi:tk(cbc(aes))-plain :32:logon:logkey: 0 /dev/mmcblk1p3 0 1 sector_size:512"
device-mapper: reload ioctl on encrypted (252:0) failed: Invalid argument Command failed.

Replacing 32 with 36 made this work:

root@smarcimx8mq4g:/data/caam# dmsetup -v create encrypted --table "0 $(blockdev --getsz /dev/mmcblk1p3) crypt capi:tk(cbc(aes))-plain :36:logon:logkey: 0 /dev/mmcblk1p3 0 1 sector_size:512"
Name: encrypted
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 0
Event number: 0
Major, minor: 252, 0
Number of targets: 1

I have a couple of questions about keyctl_caam. Who can I contact? (There is no "issues" tab in the repo.)

[jontrulson]

It might also be worth mentioning how that value is computed - essentially key length + 20 (overhead). See

keyctl_caam/caam-keygen_priv.h

Line 42 in 8dba6d3

#define TAG_OVERHEAD_SIZE 20

[leorampen-engie]

@iuliana-prodan it would be very helpful if you merged this PR. I wasted a lot of time today trying to debug why it wasn't working - and it turns out there's been a PR for the last 2 years which would have saved all that time.

[iuliana-prodan]

@iuliana-prodan it would be very helpful if you merged this PR. I wasted a lot of time today trying to debug why it wasn't working - and it turns out there's been a PR for the last 2 years which would have saved all that time.

@kshitizvars can we merge this?

[iuliana-prodan]

@iuliana-prodan it would be very helpful if you merged this PR. I wasted a lot of time today trying to debug why it wasn't working - and it turns out there's been a PR for the last 2 years which would have saved all that time.

@kshitizvars can we merge this?

LE: @fadedbee I'm not maintaining this repo so not my call to merge it or not.