x25519
A pure Python implemention of curve25519
Decision gist · record as of 2026-08-14
No. The package is abandoned (last release 2021-10-24, no maintenance since), and the author explicitly recommends C implementations like pysodium for actual use. Install only if you need pure Python for educational purposes or an environment where compiled dependencies are impossible; otherwise, use a maintained cryptographic library.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Installation is frictionless (pure Python wheel, no dependencies), but the package has been abandoned since its only release on 2021-10-24 with no subsequent maintenance or updates.
License · maintenance · safety
permissive license (permissive) — Public domain dedication means no license restrictions apply; you may use, modify, and distribute freely without attribution or other obligations.
last release 2021-10-24 (1755 days) · last repo commit 2021-10-24 · 4 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 301,973 downloads/mo, #7,828 on PyPI
Alternatives
Verify before relying
from binascii import hexlify
import x25519
private_key = b'1' * 32
public_key = x25519.scalar_base_mult(private_key)
print(hexlify(public_key))- Whether the pure Python implementation is cryptographically constant-time and resistant to side-channel attacks.
- Performance characteristics compared to C-based alternatives like pysodium for production use.
- Whether Python 2 support claim remains valid or if Python 3 only is now required.
What it is and what it does
x25519 is a pure Python implementation of the curve25519 elliptic curve cryptography operations, providing scalar multiplication functions for key exchange. It exposes two main operations: scalar_base_mult() to derive a public key from a private key, and scalar_mult() to compute a shared secret from a private key and peer's public key. Both functions work with 32-byte binary inputs and outputs.
The package has no runtime dependencies and installs as a pure Python wheel, making it portable across platforms. However, it is explicitly slower than C-based implementations like pysodium, as noted in its own documentation. The project has been inactive since its single release in October 2021 and is no longer maintained.
Use it for
- Educational exploration of curve25519 cryptography without compiled dependencies.
- Prototyping key exchange protocols in environments where C libraries cannot be compiled.
- Implementing ECDH in pure-Python environments where pysodium or libsodium are unavailable.
- Testing or auditing curve25519 behavior against reference implementations.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
No.
The package is abandoned (last release 2021-10-24, no maintenance since), and the author explicitly recommends C implementations like pysodium for actual use. Install only if you need pure Python for educational purposes or an environment where compiled dependencies are impossible; otherwise, use a maintained cryptographic library.
Install
x25519 on PyPI
Before you install
Installation is frictionless (pure Python wheel, no dependencies), but the package has been abandoned since its only release on 2021-10-24 with no subsequent maintenance or updates.
License in practice
Public domain dedication means no license restrictions apply; you may use, modify, and distribute freely without attribution or other obligations.
Quickstart
from binascii import hexlify
import x25519
private_key = b'1' * 32
public_key = x25519.scalar_base_mult(private_key)
print(hexlify(public_key))Verify before relying
- Whether the pure Python implementation is cryptographically constant-time and resistant to side-channel attacks.
- Performance characteristics compared to C-based alternatives like pysodium for production use.
- Whether Python 2 support claim remains valid or if Python 3 only is now required.
Package facts
| License | permissive license permissive |
| Python support | Not specified |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Abandoned 1,755 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 301,973 / month, #7,828 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | License :: Public DomainOperating System :: OS IndependentProgramming Language :: Python |
Evidence: x25519-0.0.2-py3-none-any.whl
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See also eciespy · eth-keys · pure25519 · starkbank-ecdsa · fastecdsa · diffiehellmanlib · sslcrypto · py-sr25519-bindings · py-ecc · py_arkworks_bls12381