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35 lines
1.3 KiB
Markdown
35 lines
1.3 KiB
Markdown
# XLD Logchecker
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This is a fork of https://github.com/puddly/xld_logsigner, to be used within our
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downstream applications, removing unnecessary functionality that we do not need.
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Based heavily on [barrybingo/xld_sign](https://github.com/barrybingo/xld_sign).
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This is a complete disassembly of the XLD log signing algorithm, re-implemented in
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Python 3.5+.
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# Usage
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usage: xld.py [-h] (--verify | --sign) FILE
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Verifies and resigns XLD logs
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positional arguments:
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FILE path to the log file
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optional arguments:
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-h, --help show this help message and exit
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--verify verify a log
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--sign sign or fix an existing log
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# Overview
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The final code isn't pretty, but it is simple enough to describe the algorithm.
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1. The log is encoded as UTF-8 and hashed with a SHA-256 variant that uses a different IV.
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2. The digest is converted to hex and the string `\nVersion=0001` is appended onto the end.
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3. The versioned hex-digest is then passed through an unidentified scrambling function that operates on pairs of bytes (open an issue if you recognize it).
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4. The resulting bytestring is then encoded using a 65-character lookup table with a strange mapping.
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