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  1. 6d0a6d1 Merge "Remove test mapping file for acloud_test" by Julien Desprez · 13 days ago master
  2. b53f806 Remove test mapping file for acloud_test by Julien Desprez · 13 days ago
  3. bd1808f Upgrade python/rsa to version-4.7 by Haibo Huang · 2 weeks ago
  4. fa3282a Bumped version to 4.7 by Sybren A. Stüvel · 2 weeks ago upstream-master
  5. a364e82 Marked version 4.7 as released by Sybren A. Stüvel · 2 weeks ago

Pure Python RSA implementation

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Python-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. For all changes, check the changelog.

Download and install using:

pip install rsa

or download it from the Python Package Index.

The source code is maintained at GitHub and is licensed under the Apache License, version 2.0


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 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.