Unpacking encrypted backup to a tar file

[Stever]

I've created a backup using the following command runnning on Windows 10 connected to an un-rooted encrypted Samsung Galaxy S7 Edge running Android 6.0.1:
(Note: mydomain and myapp are replaced with the actual domain and app name.)

adb backup com.mydomain.myapp

When that runs the device asks me for the encryption password on the phone which I then type in. Then, it creates a backup file named backup.ab.

Then I try to unpack the backup.ab to a backup.tar with abe.jar. I have tried all of the following where "mypassword" is the actual password:

java.exe -jar abe.jar unpack backup.ab backup.tar
java.exe -jar abe.jar unpack backup.ab backup.tar ""
java.exe -jar abe.jar unpack backup.ab backup.tar "mypassword"
java.exe -jar abe.jar unpack backup.ab backup.tar 'mypassword'
java.exe -jar abe.jar unpack backup.ab backup.tar mypassword

All of the commands result in the following output from abe:

Password is set but strong AES encryption is not allowed
Please install Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files 7 or 8
http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html
http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html
Exiting.

My Java version is 1.8.0_111. I have checked the lib/security directory and it has both local_policy.jar and US_export_policy.jar.

Am I doing something wrong or is it not possible to unpack an encrypted backup file?

Thanks,

Steve

[dragomerlin]

local_policy.jar and US_export_policy.jar are already installed by default, but those versions don't allow strong AES encryption. Download the files that do and replace them.

[Stever]

Works great! Thank you!!!