Python S/MIME Toolkit
This library implements a S/MIME handler. In this first version, it can only encrypt S/MIME messages using a public RSA key, in AES128-CBC, AES192-CBC or AES256-CBC modes.
The ASN.1 implementation does not depend on pyasn1, as it showed too broken for creating and reading CMS (Cryptographic Message Syntax). Instead, the Google’s certificate transparency project was used in this project.
This implementation uses pycrypto instead of OpenSSL, so everything is ‘pure python’.
- Python 2.7 or Python 3.3
The code below loads Alice’s public key in PEM format and uses it to encrypt the e-mail in S/MIME format:
import sys import smime message = [ 'To: "Alice" <firstname.lastname@example.org>', 'From: "Bob" <email@example.com>', 'Subject: A message from python', '', 'Now you see me.' ] with open('alice-public-key.pem', 'rb') in pem print(smime.encrypt('\n'.join(message), pem.read()))
To: "Alice" <firstname.lastname@example.org> From: "Bob" <email@example.com> Subject: A message from python MIME-Version: 1.0 Content-Type: application/pkcs7-mime; smime-type=enveloped-data; name=smime.p7m Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename=smime.p7m <base64-enveloped-data>
The same can be decrypted using OpenSSL from the command line:
$ openssl smime -decrypt -in smime.p7m -inkey alice-private-key.pem
This software is licensed under the Apache License 2.0. See the LICENSE file in the top distribution directory for the full license text.
This software follows Semantic Versioning
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