Wii Zipcode Decryptor for "Set Personal Data Channel"

This Python 3 script decrypts DAT files from the Wii's japan-only "Set Personal Data Channel" (000100084843434A). Thanks to Larsenv from RiiConnect24 for figuring out the keys and the format!

Usage

1. Install PyCryptodome
2. Put your encrypted DAT files in the subdirectories "zipcode/001" and "zipcode/255" (just examples, any subdir will work; also see this repo) of this script
3. Run decryptor.py
4. Your decrypted DAT files are in the "decrypted" subdirectory!

And after that?

1. Decompress the LZ77 archive with DSDecmp (dsdecmp DAT_File)
2. ???

Technical stuff

1. Remove the first 320 bytes (the RSA signature) from the DAT file
2. Decrypt it with AES-256-CBC mode and the key 01676854AC6A4049BE124975A9E2233E96BCE619BFD6472EBD2778933C10FFE5 with A03F89FA977647DBB42ACF16EAB6DB3E as initialization vector
3. You get a file with "zpcd" as the first bytes. Remove the first 25 bytes from the decrypted data and you get an LZ77-compressed archive