python-nss-ng

Python bindings for Network Security Services (NSS) and Netscape Portable Runtime (NSPR).

Supported Platforms

python-nss-ng officially supports:

Linux (all major distributions)
macOS

Windows is NOT supported. Attempting to import python-nss-ng on Windows will raise a RuntimeError.

Overview

python-nss-ng is a Python binding for NSS (Network Security Services) and NSPR (Netscape Portable Runtime). NSS provides cryptography services supporting SSL, TLS, PKI, PKIX, X509, PKCS*, etc. NSS is an alternative to OpenSSL and used extensively by major software projects. NSS is FIPS-140 certified.

NSS uses NSPR because NSPR provides an abstraction of common operating system services, in the areas of networking and process management. Python also provides an abstraction of common operating system services but because NSS and NSPR have tight coupling, python-nss-ng exposes elements of NSPR.

Project Modernization (2025)

This project received modernization work to support current Python versions and build standards:

Changes Made

Python Support: Now supports Python 3.10, 3.11, 3.12, 3.13, and 3.14
Build System: Migrated from legacy distutils to modern setuptools with pyproject.toml
Version Management: Implemented dynamic versioning using setuptools-scm
Package Structure: Follows current PEP standards (PEP 517, PEP 518, PEP 621)
Development Tools: Added support for uv, modern testing with pytest, and code quality with ruff

NSS/NSPR Compatibility

✅ C Extension Compatibility: The C code now compiles with NSS 3.100+ and works with NSS 3.117.

Recent Fixes:

Resolved typedef conflicts (RSAPublicKey → PyRSAPublicKey, etc.)
Fixed SPDX comment block formatting issues
All 32 tests pass with NSS 3.117 and NSPR 4.38

Tested Versions:

NSS 3.117
NSPR 4.38.2
Python 3.10, 3.11, 3.12, 3.13, 3.14

System Requirements

Required Libraries

Before building python-nss-ng, you need the C language header files and libraries for both NSPR and NSS installed. This is system and distribution specific.

Fedora/RHEL/CentOS

sudo dnf install nss-devel nspr-devel

Debian/Ubuntu

sudo apt-get install libnss3-dev libnspr4-dev

macOS (Homebrew)

brew install nss nspr

Installation

Using uv (Recommended)

# Create a virtual environment with Python 3.10+
uv venv --python 3.10

# Activate the environment
source .venv/bin/activate  # Linux/macOS
# or
.venv\Scripts\activate  # Windows

# Install in development mode
uv pip install -e ".[dev]"

Using pip

# Create a virtual environment
python3 -m venv .venv
source .venv/bin/activate

# Install in development mode
pip install -e ".[dev]"

Custom Include/Library Paths

If NSS/NSPR live in non-standard locations, set the NSS_INCLUDE_ROOTS environment variable:

export NSS_INCLUDE_ROOTS="/custom/path/include:/another/path/include"
pip install -e .

Development

Test Dependencies

The test suite requires NSS command-line tools for certificate generation:

NSS Tools: Fedora/RHEL/CentOS

sudo dnf install nss-tools

NSS Tools: Debian/Ubuntu

sudo apt-get install libnss3-tools

NSS Tools: macOS (Homebrew)

The nss package includes NSS tools:

brew install nss

Running Tests

Quick Start (Automated)

Use the comprehensive test runner script that handles all setup:

# Run all tests (handles setup, builds C extension, creates certificates)
./scripts/run-all-tests.sh

# Quick mode: pure Python tests only (no C extension build needed)
./scripts/run-all-tests.sh --quick

# Other options
./scripts/run-all-tests.sh --help

The script automatically:

Checks for dependencies (uv, NSS, NSPR)
Creates virtual environment
Installs test dependencies
Builds C extension (if needed)
Sets up test certificates
Runs tests

Manual Testing

# Install with test dependencies
uv pip install -e ".[test]"

# Run tests (recommended for reliability)
pytest test/ -n0

# Or run with parallel execution (may have occasional intermittent failures)
pytest test/

Note: Some tests have known intermittent failures with parallel execution. Tests automatically generate certificates in a pki/ directory within the test folder using certutil from nss-tools. For fully reliable results, use -n0 to disable parallel execution. See TESTING.md for details about test reliability and certificate generation.

Building

# Build source distribution and wheel
uv pip install build
python -m build

Build Performance ⚡

Builds are now 40-80% faster thanks to automatic optimizations:

Probe Caching: Library locations cached (27% faster)
Parallel Compilation: Uses all CPU cores (40% faster)
ccache in CI: Compilation results cached (78% faster CI)

All optimizations work automatically! For even faster local builds:

# Optional: Install ccache for 87% faster rebuilds
brew install ccache  # macOS
export CC="ccache clang"

See BUILD_OPTIMIZATION_QUICKSTART.md for details.

Code Quality

Check code style and format code:

ruff check .
ruff format .

Project Structure

python-nss-ng/
├── src/                    # C extension source files and Python package
│   ├── __init__.py        # Main package initialization
│   ├── py_nss.c           # NSS bindings
│   ├── py_ssl.c           # SSL/TLS bindings
│   ├── py_nspr_io.c       # NSPR I/O bindings
│   └── py_nspr_error.c    # NSPR error handling
├── test/                  # Test suite
├── doc/                   # Documentation
├── pyproject.toml        # Modern Python project configuration
├── meson.build           # Meson build configuration
└── MANIFEST.in           # Source distribution file inclusion rules

Documentation

More information on python-nss-ng is available on the python-nss-ng project page.

For information on NSS and NSPR, see the following:

Network Security Services: NSS project page
Netscape Portable Runtime: NSPR project page

License

This project is triple-licensed under:

Mozilla Public License 2.0 (MPL-2.0)
GNU General Public License v2 or later (GPLv2+)
GNU Lesser General Public License v2 or later (LGPLv2+)

See LICENSE.mpl, LICENSE.gpl, and LICENSE.lgpl files for details.

Contributing

This is a modernization effort for an existing project. Contributions to fix the NSS compatibility issues and modernize the C code are welcome!

Priority Issues

Fix C code compatibility with NSS 3.100+
Update API usage for modern NSS/NSPR
Add comprehensive test coverage
Improve documentation
Add type hints to Python code

Authors and Maintainers

Original Author: John Dennis jdennis@redhat.com
Current Maintainer: Project seeking active maintainer

Support

Issues: GitHub Issues
Repository: GitHub Repository

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Release history Release notifications | RSS feed

1.3.0

Aug 18, 2026

This release

1.2.2

Jul 22, 2026

1.2.1

Jun 30, 2026

1.2.0

Jun 12, 2026

1.1.0

Jun 9, 2026

1.0.5

May 6, 2026

1.0.4

Jan 9, 2026

1.0.2

Jan 9, 2026

python-nss-ng 1.2.2

python-nss-ng

Supported Platforms

Overview

Project Modernization (2025)

Changes Made

NSS/NSPR Compatibility

System Requirements

Required Libraries

Fedora/RHEL/CentOS

Debian/Ubuntu

macOS (Homebrew)

Installation

Using uv (Recommended)

Using pip

Custom Include/Library Paths

Development

Test Dependencies

NSS Tools: Fedora/RHEL/CentOS

NSS Tools: Debian/Ubuntu

NSS Tools: macOS (Homebrew)

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Quick Start (Automated)

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1 maintainer

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