= cryptsetup-luksConvertKey(8)
:doctype: manpage
:manmanual: Maintenance Commands
:mansource: cryptsetup {release-version}
:man-linkstyle: pass:[blue R < >]
:COMMON_OPTIONS:
:ACTION_LUKSCONVERTKEY:

== Name

cryptsetup-luksConvertKey - converts an existing LUKS2 keyslot to new PBKDF parameters

== SYNOPSIS

*cryptsetup _luksConvertKey_ [<options>] <device>*

== DESCRIPTION

Converts an existing LUKS2 keyslot to new PBKDF parameters. The
passphrase for keyslot to be converted must be supplied interactively or
via --key-file. If no --pbkdf parameters are specified LUKS2 default
PBKDF values will apply.

If a keyslot is specified (via --key-slot), the passphrase for that
keyslot must be given. If no keyslot is specified and there is still a
free keyslot, then the new parameters will be put into a free keyslot
before the keyslot containing the old parameters is purged. If there is
no free keyslot, then the keyslot with the old parameters is overwritten
directly.

*WARNING:* If a keyslot is overwritten, a media failure during this
operation can cause the overwrite to fail after the old parameters have
been wiped and make the LUKS container inaccessible.

*<options>* can be [--key-file, --keyfile-offset, --keyfile-size,
--key-slot, --hash, --header, --disable-locks, --iter-time, --pbkdf,
--pbkdf-force-iterations, --pbkdf-memory, --pbkdf-parallel,
--keyslot-cipher, --keyslot-key-size, --timeout, --verify-passphrase].

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