For zkey-cryptsetup commands reencipher and setkey, use the
same password-based key derivation function (PBKDF) when
creating unbound key-sots that the key slot uses, which was
unlocked through the specified passphrase. That way the
unlocked key slots created by these commands inherit the
PBKDF from the existing key slot.
This feature requires libcryptsetup version 2.1 or later.
If an older libcryptsetup version is available at compile
time, then PBKDF2 is used for newly created unbound key slots.
Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
LUKS2 encrypted volumes use Argon2i as default password based key
derivation function (PBKDF). Argon2i is a so-called memory-hard
function. It requires a certain amount of physical memory to make
dictionary attacks more costly.
Unfortunately, when multiple encrypted volumes are unlocked
automatically during system startup via /etc/crypttab, the use of
Argon2i will most likely cause an out-of-memory error in systemd.
To avoid the out-of-memory error, use PBKDF2 instead. Because PAES
uses secure keys as volume keys, the security of the key derivation
function used to derive the key to encrypt the volume key in the LUKS
key slots is of less relevance. Thus it is safe to use a weaker key
derivation function.
Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
The zkey-cryptsetup tool is used to validate and re-encipher
secure AES volume keys of volumes encrypted with LUKS2 and
the paes cipher.
Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Ingo Franzki