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Unpack .crx files the way Chrome does

Project Description

crx_unpack is a Python library for extracting the contents of a Chrome extension file (.crx).

Structure of CRX Package Format

As explained at

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.

Release History

Release History

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
crx_unpack-0.1-py3-none-any.whl (10.9 kB) Copy SHA256 Checksum SHA256 py3 Wheel Apr 19, 2017
crx_unpack-0.1.tar.gz (8.5 kB) Copy SHA256 Checksum SHA256 Source Apr 19, 2017

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