---
id: sslcrypto
version: "5.3"
license: unclear
license_treatment: unclear
maintenance: abandoned
---

# sslcrypto — ECIES, AES and RSA OpenSSL-based implementation with fallback

License: unclear · Maintenance: abandoned · Downloads: 92.6K/mo

## What it is and what it does

sslcrypto is a lightweight cryptography library that implements AES symmetric encryption, ECIES public-key encryption, and ECDSA digital signatures. It supports multiple cipher modes (CBC, CTR, CFB, OFB) and elliptic curves (including secp256k1 used in Bitcoin), with optional OpenSSL acceleration when available and a pure-Python fallback for environments where OpenSSL is unavailable or undesirable.

The library is designed for scenarios where full-featured cryptography packages are too heavy or require system dependencies not available by default. It includes Bitcoin-specific utilities like WIF key conversion and address generation. However, the package has been abandoned since 2020 with no recent maintenance, so it should be evaluated carefully for security-sensitive applications.

Use it for:

- Encrypt and decrypt sensitive data using AES with multiple cipher modes in pure Python without external system dependencies.
- Generate and verify ECDSA signatures on secp256k1 for Bitcoin or other blockchain applications.
- Perform ECIES encryption and decryption using elliptic curves when asymmetric encryption is needed.
- Derive Bitcoin keys, convert to WIF format, and generate addresses from private keys.
- Recover public keys from recoverable ECDSA signatures for transaction verification.

## Worth the install?

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

Provides AES, ECIES, and ECDSA cryptographic operations with optional OpenSSL acceleration and pure-Python fallback, supporting multiple cipher modes and elliptic curves including secp256k1.

No, not recommended for new projects. While the package offers low install friction and covers common cryptographic operations, it is abandoned (last release April 2020, no commits since November 2020). Security vulnerabilities are unlikely to be patched, and compatibility with modern Python versions is uncertain. For AES, ECDSA, and ECIES, use actively maintained alternatives like cryptography or coincurve instead.

## Install

pip install sslcrypto
uv add sslcrypto
poetry add sslcrypto

## Installing sslcrypto

Before you install: Low install friction with only two runtime dependencies (base58, pyaes). However, the package is abandoned—last release April 2020, no commits since November 2020—so security patches and bug fixes are unlikely.

License in practice: License treatment is unclear in the metadata, though the description notes MIT plus BSD-2 for the ripemd implementation. Verify the actual license terms before use in proprietary or GPL-licensed projects.

Quickstart:

pip install sslcrypto

import sslcrypto

# AES example
key = sslcrypto.aes.new_key()
data = b"Hello, world!"
ciphertext, iv = sslcrypto.aes.encrypt(data, key)
assert sslcrypto.aes.decrypt(ciphertext, iv, key) == data

# ECDSA example
curve = sslcrypto.ecc.get_curve("secp256k1")
private_key = curve.new_private_key()
public_key = curve.private_to_public(private_key)
signature = curve.sign(data, private_key)
assert curve.verify(signature, data, public_key) == True

Verify before relying:

- Whether the package has received security audits or is suitable for production use in high-security contexts.
- Current compatibility with modern Python versions and whether dependencies (base58, pyaes) are actively maintained.
- Whether OpenSSL detection and fallback behavior work reliably on all target platforms.

## Package facts

- License: not declared (unclear)
- Python support: unspecified
- Install friction: low
- Maintenance: abandoned
- Downloads: 92.6K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

AES encryption decryption, ECDSA signing verification, ECIES elliptic curve, secp256k1 cryptography, OpenSSL fallback pure Python, bitcoin key derivation, symmetric asymmetric crypto, abandoned, bitcoin-compatible, pure-python-fallback

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