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([2a01:cb19:8f4f:fc00:2569:8eeb:9624:bdc3]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4601f2ec711sm7115339f8f.12.2026.06.03.05.43.23 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 03 Jun 2026 05:43:23 -0700 (PDT) Message-ID: Date: Wed, 3 Jun 2026 14:43:22 +0200 Precedence: bulk X-Mailing-List: cryptsetup@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: cryptsetup@lists.linux.dev From: Frederic Hoerni Subject: reencryption with multi keyslots in batch mode Autocrypt: addr=frederic.hoerni@canonical.com; keydata= xjMEadS0IRYJKwYBBAHaRw8BAQdAW/GkWfvxpXdIaOrchDbHVLO9xMnp3oHJpqjOVUjTOdfN L0ZyZWRlcmljIEhvZXJuaSA8ZnJlZGVyaWMuaG9lcm5pQGNhbm9uaWNhbC5jb20+wpkEExYK AEEWIQRbtAD/Ny9UK4YMzm4kkcChcjqtkwUCadS0IQIbAwUJCWYBgAULCQgHAgIiAgYVCgkI CwIEFgIDAQIeBwIXgAAKCRAkkcChcjqtk2NNAQCrL6jIJ/F8RMowkcwx3dQqyiVJv5gvIbxd S3WuKut79wD+PaJy16Y8v7Ve29A1NgBWb8YDc7DkWWHPadfcXU6gZAbOOARp1LQhEgorBgEE AZdVAQUBAQdAj7udSgU+c6qgap1JWUeFkmj4oavjC72Kklwk3aCe3z0DAQgHwn4EGBYKACYW IQRbtAD/Ny9UK4YMzm4kkcChcjqtkwUCadS0IQIbDAUJCWYBgAAKCRAkkcChcjqtkzY+AQDP 59nYHgp6sL8G8T86PB5yPeUp66k1ETQFDkEW52uodQEAjwzjsIlhmJogOI3KbnYFgwkOl7Rx bJuA1Yc+ya62Rwk= Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hello, If we want to reencrypt a disk that has several keyslots (main and recovery keyslots), I believe the only way is to do it in interactive mode. But in some cases, we would like to do this in batch mode. We could imagine a scenario like this: 1. Setup of the use case (no modification of cryptsetup needed so far) # Initialize LUKS container dd if=/dev/zero count=200 of=disk.img bs=1M echo 0000 | sudo cryptsetup luksFormat --keyfile-size 4 \ --key-file - \ disk.img # Add two keyslots echo -n 0000x111111 | cryptsetup luksAddKey --key-file - \ --keyfile-size 4 \ disk.img echo -n 0000222 | cryptsetup luksAddKey --key-file - \ --keyfile-size 4 \ disk.img 2. Reencryption (this step needs modification of cryptsetup) echo -n 0000x111111222 | \ sudo cryptsetup reencrypt --key-file - \ --keypipe-sizes "4,7,3" \ --batch-mode \ --force-offline-reencrypt \ disk.img 3. Verify all keyslots for passphrase in 0000 x111111 222; do echo -n $passphrase | cryptsetup open disk.img --test-passphrase \ --key-file - done Do you have any on-going work in this direction? Are you open to contribution for that? (I already have a proof of concept for the above scenario) Do you have any particular caveat about developing this feature? Thank you Frederic