---
id: siphash
version: "0.0.1"
license: MIT
license_treatment: permissive
maintenance: abandoned
---

# siphash — siphash - python siphash implementation

License: permissive · Maintenance: abandoned · Downloads: 74.5K/mo

## What it is and what it does

Siphash is a keyed hash function designed for speed and security on short inputs, commonly used for network authentication and defense against hash-flooding denial-of-service attacks. This package provides a pure-Python implementation following the hashlib API, allowing you to create SipHash instances with a key, update them with data, and extract the hash as a numeric value, raw bytes, or hex string.

The package is unmaintained since 2013 and offers no performance advantages over native implementations in modern languages. It is suitable primarily for legacy code that depends on it or for educational exploration of the SipHash algorithm itself. Performance is inherently limited by the pure-Python approach.

Use it for:

- Integrate SipHash hashing into legacy Python applications that already depend on this package.
- Educational study of the SipHash algorithm and its implementation in Python.
- Hash table operations where hash-flooding defense is needed in environments without access to faster native implementations.
- Network traffic authentication in low-throughput scenarios where pure-Python performance is acceptable.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Provides a Python implementation of SipHash, a keyed hash function optimized for speed on short messages, following the hashlib API.

No, unless you are maintaining legacy code that already depends on it. The package is abandoned (last update 2013), offers no performance advantage over native implementations, and has unspecified Python version support. For new projects, use a maintained cryptographic library or a faster SipHash binding instead.

## Install

pip install siphash
uv add siphash
poetry add siphash

## Installing siphash

Before you install: High install friction due to source distribution only. Package is abandoned—last release and commit were in 2013, with no maintenance for several years. Suitable only for legacy integration or educational purposes.

License in practice: MIT license is permissive and imposes no restrictions on use, modification, or distribution in proprietary or open-source projects.

Quickstart:

import siphash
key = '0123456789ABCDEF'
sip = siphash.SipHash_2_4(key, 'a')
print(sip.hexdigest())  # '864c339cb0dc0fac'

Pure Python implementation; performance is inherently limited compared to compiled alternatives.

Verify before relying:

- Whether this implementation remains cryptographically sound against modern attacks or has known weaknesses.
- Compatibility with Python versions beyond 3.2 (last tested version listed); modern Python support is unspecified.
- Whether the pure-Python performance characteristics meet actual application requirements.

## Package facts

- License: MIT (permissive)
- Python support: unspecified
- Install friction: high
- Maintenance: abandoned
- Downloads: 74.5K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

siphash hash function, keyed hash python, short message authentication, hash-flooding dos defense, pseudorandom function, cryptographic hash, network traffic authentication, abandoned, pure-python, legacy

[View on SkillFed](https://skillfed.io/packages/siphash) · [View on PyPI](https://pypi.org/project/siphash/)