XP-Install (xpi) code signing.

Requirements

• Recent Python (2.5+)
• M2Crypto (recommended) easy_install -Z M2Crypto
  • Windows users must also install valid OpenSSL binaries into their (Python) path. Copying files to the corresponding M2Crypto directory under Python\libs\site-packages will also do the trick
• OR openssl binary within the path

Usage

python xpisign.py -k cert.pem addon.xpi addon.signed.xpi

Credits

Thanks to Wladimir Palant for initially researching this stuff!