Python PKCS#11 - High Level Wrapper API
A high level, “more Pythonic” interface to the PKCS#11 (Cryptoki) standard to support HSM and Smartcard devices in Python.
The interface is designed to follow the logical structure of a HSM, with useful defaults for obscurely documented parameters. Many APIs will optionally accept iterables and act as generators, allowing you to stream large data blocks for symmetric encryption.
python-pkcs11 also includes numerous utility functions to convert between PKCS #11 data structures and common interchange formats including PKCS #1 and X.509.
python-pkcs11 is fully documented and has a full integration test suite for all features.
Historically, this project used to run continuous integration tests against several HSM platforms, but this test setup has not been maintained over time. Currently, the integration tests in GitHub Actions use SoftHSMv2 as a baseline. We also test against opencryptoki in CI. If you would like to contribute some CI setup with additional PKCS#11 implementations or actual HSMs, let’s chat!
Source: https://github.com/pyauth/python-pkcs11
Documentation: http://python-pkcs11.readthedocs.io/en/latest/
Getting Started
Install from Pip:
pip install python-pkcs11
Or build from source:
python -m build .
Or using uv:
uv build
Assuming your PKCS#11 library is set as PKCS11_MODULE and contains a token named DEMO:
AES
import pkcs11
# Initialise our PKCS#11 library
lib = pkcs11.lib(os.environ['PKCS11_MODULE'])
token = lib.get_token(token_label='DEMO')
data = b'INPUT DATA'
# Open a session on our token
with token.open(user_pin='1234') as session:
# Generate an AES key in this session
key = session.generate_key(pkcs11.KeyType.AES, 256)
# Get an initialisation vector
iv = session.generate_random(128) # AES blocks are fixed at 128 bits
# Encrypt our data
crypttext = key.encrypt(data, mechanism_param=iv)
3DES
import pkcs11
# Initialise our PKCS#11 library
lib = pkcs11.lib(os.environ['PKCS11_MODULE'])
token = lib.get_token(token_label='DEMO')
data = b'INPUT DATA'
# Open a session on our token
with token.open(user_pin='1234') as session:
# Generate a DES key in this session
key = session.generate_key(pkcs11.KeyType.DES3)
# Get an initialisation vector
iv = session.generate_random(64) # DES blocks are fixed at 64 bits
# Encrypt our data
crypttext = key.encrypt(data, mechanism_param=iv)
RSA
import pkcs11
lib = pkcs11.lib(os.environ['PKCS11_MODULE'])
token = lib.get_token(token_label='DEMO')
data = b'INPUT DATA'
# Open a session on our token
with token.open(user_pin='1234') as session:
# Generate an RSA keypair in this session
pub, priv = session.generate_keypair(pkcs11.KeyType.RSA, 2048)
# Encrypt as one block
crypttext = pub.encrypt(data)
DSA
import pkcs11
lib = pkcs11.lib(os.environ['PKCS11_MODULE'])
token = lib.get_token(token_label='DEMO')
data = b'INPUT DATA'
# Open a session on our token
with token.open(user_pin='1234') as session:
# Generate an DSA keypair in this session
pub, priv = session.generate_keypair(pkcs11.KeyType.DSA, 1024)
# Sign
signature = priv.sign(data)
ECDSA
import pkcs11
lib = pkcs11.lib(os.environ['PKCS11_MODULE'])
token = lib.get_token(token_label='DEMO')
data = b'INPUT DATA'
# Open a session on our token
with token.open(user_pin='1234') as session:
# Generate an EC keypair in this session from a named curve
ecparams = session.create_domain_parameters(
pkcs11.KeyType.EC, {
pkcs11.Attribute.EC_PARAMS: pkcs11.util.ec.encode_named_curve_parameters('secp256r1'),
}, local=True)
pub, priv = ecparams.generate_keypair()
# Sign
signature = priv.sign(data)
Diffie-Hellman
import pkcs11
lib = pkcs11.lib(os.environ['PKCS11_MODULE'])
token = lib.get_token(token_label='DEMO')
with token.open() as session:
# Given shared Diffie-Hellman parameters
parameters = session.create_domain_parameters(pkcs11.KeyType.DH, {
pkcs11.Attribute.PRIME: prime, # Diffie-Hellman parameters
pkcs11.Attribute.BASE: base,
})
# Generate a DH key pair from the public parameters
public, private = parameters.generate_keypair()
# Share the public half of it with our other party.
_network_.write(public[Attribute.VALUE])
# And get their shared value
other_value = _network_.read()
# Derive a shared session key with perfect forward secrecy
session_key = private.derive_key(
pkcs11.KeyType.AES, 128,
mechanism_param=other_value)
Elliptic-Curve Diffie-Hellman
import pkcs11
lib = pkcs11.lib(os.environ['PKCS11_MODULE'])
token = lib.get_token(token_label='DEMO')
with token.open() as session:
# Given DER encocded EC parameters, e.g. from
# openssl ecparam -outform der -name <named curve>
parameters = session.create_domain_parameters(pkcs11.KeyType.EC, {
pkcs11.Attribute.EC_PARAMS: ecparams,
})
# Generate a DH key pair from the public parameters
public, private = parameters.generate_keypair()
# Share the public half of it with our other party.
_network_.write(public[pkcs11.Attribute.EC_POINT])
# And get their shared value
other_value = _network_.read()
# Derive a shared session key
session_key = private.derive_key(
pkcs11.KeyType.AES, 128,
mechanism_param=(pkcs11.KDF.NULL, None, other_value))
Tested Compatibility
Functionality |
SoftHSMv2 |
Thales nCipher |
Opencryptoki |
OpenSC (Nitrokey) |
||
|---|---|---|---|---|---|---|
Get Slots/Tokens |
Works |
Works |
Works |
Works |
||
Get Mechanisms |
Works |
Works |
Works |
Works |
||
Initialize token |
Not implemented |
|||||
Slot events |
Not implemented |
|||||
Alternative authentication path |
Not implemented |
|||||
Always authenticate keys |
Not implemented |
|||||
Create/Copy |
Keys |
Works |
Works |
Errors |
Create |
|
Certificates |
Caveats [1] |
Caveats [1] |
Caveats [1] |
? |
||
Domain Params |
Caveats [1] |
Caveats [1] |
? |
N/A |
||
Destroy Object |
Works |
N/A |
Works |
Works |
||
Generate Random |
Works |
Works |
Works |
Works |
||
Seed Random |
Works |
N/A |
N/A |
N/A |
||
Digest (Data & Keys) |
Works |
Caveats [2] |
Works |
Works |
||
AES |
Generate key |
Works |
Works |
Works |
N/A |
|
Encrypt/Decrypt |
Works |
Works |
Works |
|||
Wrap/Unwrap |
? [3] |
Works |
Errors |
|||
Sign/Verify |
Works |
Works [4] |
N/A |
|||
DES2/ DES3 |
Generate key |
Works |
Works |
Works |
N/A |
|
Encrypt/Decrypt |
Works |
Works |
Works |
|||
Wrap/Unwrap |
? |
? |
? |
|||
Sign/Verify |
? |
? |
? |
|||
RSA |
Generate key pair |
Works |
Works |
Works |
||
Encrypt/Decrypt |
Works |
Works |
Works |
Decrypt only [9] |
||
Wrap/Unwrap |
Works |
Works |
Works |
N/A |
||
Sign/Verify |
Works |
Works |
Works |
Works |
||
DSA |
Generate parameters |
Works |
Error |
N/A |
N/A |
|
Generate key pair |
Works |
Caveats [5] |
||||
Sign/Verify |
Works |
Works [4] |
||||
DH |
Generate parameters |
Works |
N/A |
N/A |
N/A |
|
Generate key pair |
Works |
Caveats [6] |
||||
Derive Key |
Works |
Caveats [7] |
||||
EC |
Generate key pair |
Caveats [6] |
? [3] |
Works |
Works |
|
Sign/Verify (ECDSA) |
Works [4] |
? [3] |
Works |
Sign only [9] |
||
Derive key (ECDH) |
Works |
? [3] |
Works |
? |
||
ML-DSA |
Generate key pair |
Works |
? [3] |
Works |
N/A |
|
Sign/Verify |
Works |
? [3] |
Works |
|||
Proprietary extensions |
N/A |
Not implemented |
N/A |
N/A |
||
Python version:
>= 3.10
PKCS#11 versions:
2.11
2.20
2.40
3.1
3.2
Feel free to send pull requests for any functionality that’s not exposed. The code is designed to be readable and expose the PKCS #11 spec in a straight-forward way.
If you want your device supported, get in touch!
More info on PKCS #11
The latest version of the PKCS #11 spec is available from OASIS:
http://docs.oasis-open.org/pkcs11/pkcs11-base/v2.40/pkcs11-base-v2.40.html
You should also consult the documentation for your PKCS #11 implementation. Many implementations expose additional vendor options configurable in your environment, including alternative features, modes and debugging information.
License
MIT License
Copyright (c) 2017 Danielle Madeley and contributors
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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