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3DSaveTool v0.2b

3DSaveTool can be used to find the XOR key used for encryption and use it to encrypt/decrypt EEPROM savefiles of 3DS games.

3DSaveTool [-x|-f] in.bin out.bin key.bin
-x: decrypt/encrypt a savefile
-f: find XOR key

Example usage:
3DSaveTool -x savefile.bin [decrypted.bin|encrypted.bin] key.bin3DSaveTool -f savefile.bin key.bin

Change log (v0.2b):

fixed a bug in the 0xFF block detection


de/encrypting now starts at 0x1000
fixed a few new line errors in the usage info
when de/encrypting only 512byte blocks of 0xFF are skipped now
fixed a bug which would not de/encrypt the last 0x2000 bytes
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