EAC Log Signer

This is a transparent implementation of the Exact Audio Copy log checksum algorithm in Python 3.6+. Includes an option to fix those pesky edited logs.

Usage

usage: eac.py [-h] {verify,sign} ...

Verifies and resigns EAC logs

positional arguments:
  {verify,sign}
    verify       verify a log
    sign         sign or fix an existing log

optional arguments:
  -h, --help     show this help message and exit

Example

$ python3 eac.py sign bad.log good.log
$ python3 eac.py verify *.log
log1.log:  OK
log2.log:  OK
log3.log:  Malformed

Overview

The algorithm internally uses UTF-16 strings and XORs a refilling 32-byte buffer of characters with the internal state of what looks to be part of AES-256. The code is pretty short, go read it for more info. Open a pull request if you can figure out a way to simplify it.