# lsmod | grep -i gcm
gcm 24576 0
# modprobe gcm
# modinfo gcm
filename: /lib/modules/4.1.12-61.1.19.el7uek.x86_64/kernel/crypto/gcm.ko
alias: crypto-gcm
alias: gcm
alias: crypto-rfc4543
alias: rfc4543
alias: crypto-rfc4106
alias: rfc4106
alias: crypto-gcm_base
alias: gcm_base
author: Mikko Herranen <mh1@xxxxxx>
description: Galois/Counter Mode
license: GPL
srcversion: 0805471CE9244CDA1D08732
depends:
intree: Y
vermagic: 4.1.12-61.1.19.el7uek.x86_64 SMP mod_unload modversions
signer: Oracle CA Server
sig_key: 99:0C:6B:AD:6E:20:40:AB:2F:AC:19:2B:13:86:80:73:E1:2A:95:FB
sig_hashalgo: sha512
#cryptsetup luksFormat --type luks2 /dev/sdb2 --cipher aes-gcm-random --integrity aead
WARNING!
========
This will overwrite data on /dev/sdb2 irrevocably.
Are you sure? (Type 'yes' in capital letters): YES
Enter passphrase for /dev/sdb2:
Verify passphrase:
Cipher aes-gcm-random (key size 256 bits) is not available.
#
On 27/02/2020 06:37, vinay paduru wrote:
I am trying to encrypt a volume with *LUKS2* *AES-GCM-Random* cipher
and I am seeing an error saying “key size 256 bits” not available. I
tried changing the key size but same error repeats for whatever the
key size we give.
Do you have kernel with gcm crypto module enabled?
Milan
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