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Description:
crxunpack 0.1.4
This module contains several utilities for working with Google Chrome extension files (CRXs), which have the *.crx
file extension. The goal of this project is to mimic as closely as possible the functionality of Google Chrome when
these extensions are unpacked and installed.
Documentation
Please view the full documentation for this project on Read the Docs.
Installation
Since crx_unpack is available on PyPI, you can install it using pip:
$ pip install crx_unpack
Structure of CRX Package Format
The information in this section introduces the structure and contents of CRX files.
As explained at https://developer.chrome.com/extensions/crx
Package Header
The header contains the author’s public key and the extension’s signature. The signature is generated from the ZIP file
using SHA-1 with the author’s private key. The header requires a little-endian byte ordering with 4-byte alignment. The
following table describes the fields of the .crx header in order:
Field
Type
Length
Value
Description
magic number
char[]
32 bits
Cr24
Chrome requires this constant at the beginning of every .crx package.
version
unsigned int
32 bits
2
The version of the *.crx file format used (currently 2).
public key length
unsigned int
32 bits
pubkey.length
The length of the RSA public key in bytes.
signature length
unsigned int
32 bits
sig.length
The length of the signature in bytes.
public key
byte[]
pubkey.length
pubkey.contents
The contents of the author’s RSA public key formatted as an X509 SubjectPublicKeyInfo block.
signature
byte[]
sig.length
sig.contents
The signature of the ZIP content using the author’s private key. The signature is created using the RSA algorithm with the SHA-1 hash function.
Extension Contents
The extension’s ZIP file is appended to the *.crx package after the header. This should be the same ZIP file that
the signature in the header was generated from.
License
For personal and professional use. You cannot resell or redistribute these repositories in their original state.
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