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05/09/2024 07:14:02 AM
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decrypt_derived
1.22 KB
08/03/2020 09:28:48 PM
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decrypt_gnupg
567 bytes
08/03/2020 09:28:48 PM
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decrypt_keyctl
2.97 KB
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decrypt_openct
1.68 KB
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decrypt_opensc
1.38 KB
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decrypt_ssl
343 bytes
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passdev
9.99 KB
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Editing: decrypt_derived
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#!/bin/sh # WARNING: If you use the decrypt_derived keyscript for devices with # persistent data (i.e. not swap or temp devices), then you will lose # access to that data permanently if something damages the LUKS header # of the LUKS device you derive from. The same applies if you luksFormat # the device, even if you use the same passphrase(s). A LUKS header # backup, or better a backup of the data on the derived device may be # a good idea. See the Cryptsetup FAQ on how to do this right. countlines() { local IFS input count tmp input="$1" count=0 IFS=' ' for tmp in $input; do count=$(( $count + 1 )) done echo $count } if [ -z "$1" ]; then echo "$0: must be executed with a crypto device as argument" >&2 exit 1 fi if ! device=$(dmsetup --showkeys table 2>/dev/null \ | awk -vtarget="$1" '$1 == target ":" {print}'); then echo "$0: failed to find $1 in dmtable" >&2 exit 1 fi if [ -z "$device" ]; then echo "$0: device $1 doesn't exist" >&2 exit 1 fi count=$(countlines "$device") if [ $count -ne 1 ]; then echo "$0: more than one device match $1" >&2 exit 1 fi eval set -- $device type="$4" key="$6" if [ "$type" != "crypt" ]; then echo "$0: device $1 is not a crypto device" >&2 exit 1 fi echo -n "$key" exit 0