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neckothy/get-kfa-key.sh

Last active February 13, 2024 05:57
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Extract keyfile from Kindle for Android on a rooted device/emulator
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get-kfa-key.sh
#!/bin/bash
# https://github.com/noDRM/DeDRM_tools/discussions/440
# REQUIRES ROOTED DEVICE / EMULATOR
# get Notifications.pref.xml
xml=$(adb shell su -c 'cat /data/data/com.amazon.kindle/shared_prefs/Notifications.pref.xml')
# extract dsn from xml
dsn=$(echo -n "$xml" | grep -Po '(?<=<string name="serializedDeviceAttributes">{&quot;dsn&quot;:&quot;)[0-9a-f]{32}')
# convert to hexadecimal
hex=$(echo -n "$dsn" | od -A n -t x1 | sed 'N;s/[\n ]//g')
# output to file
echo "{\"DSN\": \"$hex\"}" > './kindle-for-android-key.k4i'
# alternatively, as a one-liner
# echo "{\"DSN\": \"$(adb shell su -c 'cat /data/data/com.amazon.kindle/shared_prefs/Notifications.pref.xml' | grep -Po '(?<=<string name="serializedDeviceAttributes">{&quot;dsn&quot;:&quot;)[0-9a-f]{32}' | tr -d '\n' | od -A n -t x1 | sed 'N;s/[\n ]//g')\"}" > kindle-for-android-key.k4i
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