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Python interface to CryptoSys PKI (py 3)

Project description

This is a Python interface to the CryptoSys PKI Pro library.

Requires: Python 3 on Windows platforms only. CryptoSys PKI Pro v20.5 or above must be installed. This is available from

To use in Python’s REPL

>>> from cryptosyspki import *
>>> Gen.version() # "hello world!" for CryptoSys PKI
>>> Hash.hex_from_data(b'abc') # compute SHA-1 hash in hex of 'abc' as bytes
>>> Hash.hex_from_string('abc', Hash.Alg.SHA256)   # same but over a string and using SHA-256
>>> h ='abc')   # h is a byte array (bytes->bytes)
>>> print(Cnv.tohex(h))     # display the byte array in hex

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

>>> import cryptosyspki as pki
>>> pki.Gen.version() #  Underlying core PKI dll
>>> pki.__version__   # package


Look in the file test\ and you should find an example of use for almost every available method (perhaps contrived somewhat so they’ll work in the test environment, but you should get the idea). See also the main Python web page


There is a series of tests in test\

The tests require certain files to exist in the current working directory and create extra files when they run. To manage this, creates a temporary subdirectory. It requires a subdirectory work to exist in the same folder as the file which should contain all the required test files, available separately in the file The test function then creates a temporary subdirectory which is deleted automatically.

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


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

David Ireland
DI Management Services Pty Ltd
10 September 2022

Revision History

20.6.0 (2022-09-10)

  • Changes to match main core CryptoSys PKI DLL module version 20.6.

20.5.0 (2022-07-18)

  • Changes to match main core CryptoSys PKI DLL module version 20.5.

20.4.0 (2022-05-02)

  • Changes to match main core CryptoSys PKI DLL module version 20.4.

20.3.0 (2022-01-05)

  • Changes to match main core CryptoSys PKI DLL module version 20.3.

20.0.0 (2020-10-19)

  • Changes to match main core CryptoSys PKI DLL module version 20.0.

12.4.0 (2020-05-13)

  • Changes to match main core CryptoSys PKI DLL module version 12.4.

12.3.0 (2020-03-09)

  • Changes to match main core CryptoSys PKI DLL module version 12.3.

12.2.0 (2019-12-27)

  • Updated for Python 3.

  • Changes to match main core module version 12.2.

  • Added new methods Cms.*_bytes() to handle byte arrays specifically.

  • The existing Cms.*_string() methods now handle full UTF-8-encoded strings.

  • Removed Cnv.utf8_to_latin1() and Cnv.utf8_from_latin1() - not relevant with Python 3.

  • Added Hash.hex_from_string() and Hmac.hex_from_string() methods to handle UTF-8 string types.

12.1.0 (2018-12-16)

  • Changes to match main core module versions 12.0 and 12.1.

  • Added support for RSA-PSS in RSA signatures, CMS signed-data objects and X.509 certificates.

  • Added support for RSA-OAEP in RSA encryption and CMS enveloped-data objects.

  • Added support for ECDSA in X.509 certificates.

  • Added support for ZLIB compression.

  • Added support for AES-GCM authenticated encryption.

  • Added functions to read certificate strings from P7 chain files and PFX files.

  • Added option for quicker single pass in Wipe.file().

  • Changed parameter in Cms.make_sigdata_*() functions from Cms.HashAlg type to Cms.SigAlg.

11.3.0 (2017-10-31)

  • Changes to match main core module (11.3).

11.2.0 (2017-08-11)

  • Synchronized version number with main core module (11.2).

  • Substantial changes to inline documentation.

  • Renamed Rng.bytes to Rng.bytestring to avoid clashes with Python built-in function.

  • Changed optional parameters in X509.cert_path_is_valid() and X509.get_cert_count_from_p7().

0.1.1 (2016-08-27)

  • Minor changes.

0.1.0 (2016-05-25)

  • First release of v0.1.0.

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