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Python interface to CryptoSys FirmaSAT

Project description

This is a Python interface to the core FirmaSAT library, which must be installed on your system. FirmaSAT is available from


Operates on the sello (signature) node in a SAT XML document.
Operates on the Timbre Fiscal Digital (TFD) element, if present.
PKI X.509 security utilities. Operates on private keys and X.509 certificates.
XML utilities. Operates on SAT-specific XML documents.
General info about the core library DLL, e.g. version number, compile date.
Details of errors returned by the core library DLL.

All code in is one module for simplicity of distribution. All methods are static methods.


Most errors (missing files, invalid format) will result in a firmasat.Error exception, although some methods are more forgiving and will return a negative error code instead. Passing a bad argument type will result in an ArgumentError exception

We’re not entirely sure about being this brutal with exceptions. We’d appreciate comments.

We may refine the method names and the exception behaviour in a future release. If you have feedback or suggestions, please contact us at


To use in Python’s REPL:

>>> from firmasat import *
>>> Gen.version()

If you don’t like import * and find firmasat a bit long to type each time, try

>>> import firmasat as fs
>>> fs.Gen.version()

To sign a CFDI document, create the base XML file with all the required data except the following nodes


Then run the Sello.sign_xml() method with full paths to your key and cer files.

n = Sello.sign_xml('new.xml', 'base.xml', "emisor.key", password, "emisor.cer")

This creates a new file new.xml with the sello and certificado nodes completed.


There is a series of tests in test/ This requires a subdirectory work in the same folder as the module which must contain all the required test files (available in The test function then creates a temporary subdirectory which is deleted automatically (add the argument nodelete on the command line to keep this temp directory).

test/  # this module
    work/        # this _must_ exist
        <all required test files>
        tmp.XXXXXXXX/    # created by `setup_temp_dir()`
            <copy of all required test files>
            <files created by tests>

This structure is already set up in the distribution file, so unzip the file and open a command-line prompt in the test subdirectory. You can do any of the following.

  1. python
  2. py.test -v
  3. Open the file using IDLE and select Run > Run Module (F5).

We’ve tested this using the Python 2.7.12 interpreter and IDLE, the PyDev environment in Eclipse, and using py.test.

System requirements

Windows platforms only. Python 2 must be installed on your system (at least 2.6). Python 3 is not supported. FirmaSAT v7.3 or above must also be installed.


For more information or to make suggestions, please contact us at

David Ireland
DI Management Services Pty Ltd
28 August 2016

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