Pure Python RSA implementation ============================== [](https://pypi.org/project/rsa/) [](https://travis-ci.org/sybrenstuvel/python-rsa) [](https://coveralls.io/github/sybrenstuvel/python-rsa?branch=master) [](https://codeclimate.com/github/codeclimate/codeclimate/maintainability) [Python-RSA](https://stuvel.eu/rsa) is a pure-Python RSA implementation. It supports encryption and decryption, signing and verifying signatures, and key generation according to PKCS#1 version 1.5. It can be used as a Python library as well as on the commandline. The code was mostly written by Sybren A. Stüvel. Documentation can be found at the [Python-RSA homepage](https://stuvel.eu/rsa). For all changes, check [the changelog](https://github.com/sybrenstuvel/python-rsa/blob/master/CHANGELOG.md). Download and install using: pip install rsa or download it from the [Python Package Index](https://pypi.org/project/rsa/). The source code is maintained at [GitHub](https://github.com/sybrenstuvel/python-rsa/) and is licensed under the [Apache License, version 2.0](https://www.apache.org/licenses/LICENSE-2.0) Security -------- Because of how Python internally stores numbers, it is very hard (if not impossible) to make a pure-Python program secure against timing attacks. This library is no exception, so use it with care. See https://securitypitfalls.wordpress.com/2018/08/03/constant-time-compare-in-python/ for more info. Major changes in 4.1 -------------------- Version 4.0 was the last version to support Python 2 and 3.4. Version 4.1 is compatible with Python 3.5+ only. Major changes in 4.0 -------------------- Version 3.4 was the last version in the 3.x range. Version 4.0 drops the following modules, as they are insecure: - `rsa._version133` - `rsa._version200` - `rsa.bigfile` - `rsa.varblock` Those modules were marked as deprecated in version 3.4. Furthermore, in 4.0 the I/O functions is streamlined to always work with bytes on all supported versions of Python. Version 4.0 drops support for Python 2.6 and 3.3.